Patent US1597229A successfully refreshed from Google Patents.
Patent US1547382A successfully refreshed from Google Patents.
EP0102536A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method and apparatus for producing extrusion grade polymeric material
Assignee: Phillips Petroleum Co
•
Filing: 1983-08-05
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Granted: —
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Expires: 2003-08-05
Abstract
Abstract A method of producing poly(arylene sulfide) resin suitable for the commercial production of fibers. The method includes the two stage melt filtration of a suitable poly(arylene sulfide) polymer, e.g., poly(p-phenylene sulfide), through a primary filter having an absolute micron rating of no more than about 125 microns, and through a secondary filter having a maximum absolute micron rating of about 80 or a substantially equivalent filter capacity. Also disclosed are various forms of apparatus for performing the method. In one form the apparatus employs a depth type filter of metallurgically bonded micronic size stainless steel fibers as the primary filter and one or more edge sealed screen combinations each containing one 325 mesh screen as the secondary filter. A secondary filter comprising a mesh screen and a quantity of suitable sand is also disclosed.
Inventors
- 👤 Ronald Dean Mathis
- 👤 Jerry Olin Reed
- 👤 Gerald Epps Hagler
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 03:33
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/76; D01F6/765; D01D; D01D1/00; D01D1/10; D01D1/106
Claims Analysis
Total Claims: 109
Claim 1
Independent Claim
81 words
A method of processing a polymer comprising poly(arylene sulfide), comprising the steps of: forcing molten polymer comprising poly(arylene sulfide) through primary filter means comprising a depth type filter having a maximum absolute micron rating of no more than about 125 to provide molten primary filtered polymer; and forcing said molten primary filtered polymer through secondary filter means having a maximum absolute micron rating of no more than about 80 or a substantially equivalent filtration capability to provide molten secondary filtered polymer.
Claim 2
Independent Claim
81 words
A method of processing a polymer comprising poly(arylene sulfide), comprising the steps of: forcing molten polymer comprising poly(arylene sulfide) through primary filter means comprising a depth type filter having a maximum absolute micron rating of no more than about 125 to provide molten primary filtered polymer; and forcing said molten primary filtered polymer through secondary filter means having a maximum absolute micron rating of no more than about 80 or a substantially equivalent filtration capability to provide molten secondary filtered polymer.
Claim 3
Dependent Claim
24 words
A method in accordance with claim 1 wherein the maximum absolute micron rating of said primary filter means is no more than about 100.
Claim 4
Dependent Claim
17 words
A method in accordance with claim 2 wherein said depth type filter comprises metallurgically bonded metal fibers.
Claim 5
Dependent Claim
19 words
A method in accordance with claim 2 wherein said secondary filter means comprises a plurality of superposed mesh screens.
Claim 6
Dependent Claim
18 words
A method in accordance with claim 1 wherein said a depth type filter comprises metallurgically bonded metal fibers.
Claim 7
Dependent Claim
17 words
A method in accordance with claim 2 wherein said secondary filter means comprises three superposed mesh screens.
Claim 8
Dependent Claim
18 words
A method in accordance with claim 6 wherein said mesh screens are U.S. Standard Sieve 325 mesh screens.
Claim 9
Dependent Claim
31 words
A method in accordance with claim 1 wherein said secondary filter means comprises three superposed screens each having an absolute micron rating in the range from about 59 to about 73.
Claim 10
Dependent Claim
23 words
A method in accordance with claim 1 wherein said secondary filter means comprises at least one mesh screen and a quantity of sand.
Claim 11
Dependent Claim
56 words
A method in accordance with claim 1 wherein said depth type filter comprises metallurgically bonded metal fibers and has an absolute micron rating in the range from about 45 to about 125; and wherein said secondary filter means comprises three superposed metal mesh screens each having an absolute micron rating from about 58 to about 73..
Claim 12
Dependent Claim
13 words
A method in accordance with claim 10 wherein said polymer comprises poly(phenylene sulfide).
Claim 13
Dependent Claim
26 words
A method in accordance with claim 10 wherein said poly(arylene sulfide) is characterized further as having a concentration of 1-chloronapthalene insolubles of at least 40 ppm.
Claim 14
Dependent Claim
31 words
A method in accordance with claim 11 wherein said poly(phenylene sulfide) is characterized further as having a concentration of 1-chloronapthalene insolubles in the range from about 50 to about 300 ppm.
Claim 15
Dependent Claim
31 words
A method in accordance with claim 10 wherein said poly(arylene sulfide) is characterized further as having a melt flow rate in the range from about 50 to about 600 g/10 min.
Claim 16
Dependent Claim
31 words
A method in accordance with claim 11 wherein said poly(phenylene sulfide) is characterized further as having a melt flow rate in the range from about 150 to about 400 g/10 min.
Claim 17
Dependent Claim
23 words
A method in accordance with claim 10 characterized further to include the step of extruding the secondary filtered polymer into an extruded product.
Claim 18
Dependent Claim
13 words
A method in accordance with claim 16 wherein said polymer comprises poly(phenylene sulfide).
Claim 19
Dependent Claim
26 words
A method in accordance with claim 16 wherein said poly(arylene sulfide) is characterized further as having a concentration of 1-chloronapthalene insolubles of at least 40 ppm.
Claim 20
Dependent Claim
31 words
A method in accordance with claim 17 wherein said poly(phenylene sulfide) is characterized further as having a concentration of 1-chloronapthalene insolubles in the range from about 50 to about 300 ppm.
Claim 21
Dependent Claim
31 words
A method in accordance with claim 16 wherein said poly(arylene sulfide) is characterized further as having a melt flow rate in the range from about 50 to about 600 g/10 min.
Claim 22
Dependent Claim
31 words
A method in accordance with claim 17 wherein said poly(phenylene sulfide) is characterized further as having a melt flow rate in the range from about 150 to about 400 g/10 min.
Claim 23
Dependent Claim
13 words
A method in accordance with claim 1 wherein said polymer comprises poly(phenylene sulfide).
Claim 24
Dependent Claim
31 words
A method in accordance with claim 22 wherein said poly(phenylene sulfide) is characterized further as having a concentration of 1-chloronapthalene insolubles in the range from about 50 to about 300 ppm.
Claim 25
Dependent Claim
31 words
A method in accordance with claim 22 wherein said poly(phenylene sulfide) is characterized further as having a melt flow rate in the range from about 150 to about 400 g/10 min.
Claim 26
Dependent Claim
25 words
A method in accordance with claim 1 wherein said poly(arylene sulfide) is characterized further as having a concentration of 1-chloronapthalene insolubles of at 40 ppm.
Claim 27
Dependent Claim
31 words
A method in accordance with claim 1 wherein said poly(arylene sulfide) is characterized further as having a melt flow rate in the range from about 50 to about 600 g/10 min.
Claim 28
Dependent Claim
120 words
Apparatus for processing a polymer comprising, in combination: first means for receiving a quantity of molten polymer from a molten polymer source, said first means comprising primary filter means in the form of a depth type filter comprising metallurgically bonded metal fibers having a maximum absolute micron rating of no more than about 125 for filtering the thus received molten polymer to provide molten primary filtered polymer; and second means for receiving said molten primary filtered polymer from said first means, said second means comprising secondary filter means having a maximum absolute micron rating of no more than about 80 or substantially equivalent filtration capacity for filtering the thus received molten primary filtered polymer to provide molten secondary filtered polymer.
Claim 29
Dependent Claim
120 words
Apparatus for processing a polymer comprising, in combination: first means for receiving a quantity of molten polymer from a molten polymer source, said first means comprising primary filter means in the form of a depth type filter comprising metallurgically bonded metal fibers having a maximum absolute micron rating of no more than about 125 for filtering the thus received molten polymer to provide molten primary filtered polymer; and second means for receiving said molten primary filtered polymer from said first means, said second means comprising secondary filter means having a maximum absolute micron rating of no more than about 80 or substantially equivalent filtration capacity for filtering the thus received molten primary filtered polymer to provide molten secondary filtered polymer.
Claim 30
Dependent Claim
23 words
Apparatus in accordance with claim 27 wherein the maximum absolute micron rating of said primary filter means is no more than about 100.
Claim 31
Dependent Claim
18 words
Apparatus in accordance with claim 27 wherein said metallurgically bonded metal fibers are micronic size stainless steel fibers.
Claim 32
Dependent Claim
18 words
Apparatus in accordance with claim 28 wherein said secondary filter means comprises a plurality of superposed mesh screens.
Claim 33
Dependent Claim
18 words
Apparatus in accordance with claim 28 wherein said metallurgically bonded metal fibers are micronic size stainless steel fibers.
Claim 34
Dependent Claim
16 words
Apparatus in accordance with claim 28 wherein said secondary filter means comprises three superposed mesh screens.
Claim 35
Dependent Claim
17 words
Apparatus in accordance with claim 32 wherein said mesh screens are U.S. Standard Sieve 325 mesh screens.
Claim 36
Dependent Claim
31 words
Apparatus in accordance with claim 32 wherein said secondary filter means comprises three superposed mesh screens each having an absolute micron rating in the range from about 59 to about 73.
Claim 37
Dependent Claim
22 words
Apparatus in accordance with claim 28 wherein said secondary filter means comprises at least one mesh screen and a quantity of sand.
Claim 38
Dependent Claim
56 words
Apparatus in accordance with claim 27 wherein said primary filter means is characterized further as having an absolute micron rating in the range from about 45 to about 125; and wherein said secondary filter means comprises three superposed metal mesh screens each having an absolute- micron rating in the range from about 59 to about 73.
Claim 39
Dependent Claim
41 words
Apparatus in accordance with claim 36 characterized further to include extruding means operatively connected to said second means for receiving said molten secondary filtered polymer from said second means and extruding the thus received secondary filtered polymer into an extruded product.
Claim 40
Dependent Claim
38 words
Apparatus in accordance with claim 27 wherein said primary filter means is characterized further as having an absolute micron rating of about 88; and wherein said secondary filter means comprises three superposed U.S. Standard Sieve 325 mesh screens.
Claim 41
Dependent Claim
41 words
Apparatus in accordance with claim 27 wherein said primary filter means is characterized further as having an absolute micron rating of about 88; and wherein said secondary filter means comprises one U.S. Standard Sieve 325 screen and a quantity of sand.
Claim 42
Dependent Claim
13 words
Apparatus in accordance with claim 39 wherein said sand is 20/40 mesh sand.
Claim 43
Dependent Claim
13 words
Apparatus in accordance with claim 39 wherein said sand is 60/80 mesh sand.
Claim 44
Independent Claim
90 words
A method of processing a normally solid thermoplastic polymeric material for melt spinning into fibers comprising the steps of: passing molten poly(arylene sulfide) through primary filter means comprising depth type filter media having an absolute micron rating of no more than about 125 to provide molten primary filtered polymer; and passing said molten primary filtered polymer through secondary filter means having an absolute micron rating less than or a substantially equivalent filtration capacity greater than the absolute micron rating or the substantially equivalent filtration capacity of said primary filter means.
Claim 45
Independent Claim
90 words
A method of processing a normally solid thermoplastic polymeric material for melt spinning into fibers comprising the steps of: passing molten poly(arylene sulfide) through primary filter means comprising depth type filter media having an absolute micron rating of no more than about 125 to provide molten primary filtered polymer; and passing said molten primary filtered polymer through secondary filter means having an absolute micron rating less than or a substantially equivalent filtration capacity greater than the absolute micron rating or the substantially equivalent filtration capacity of said primary filter means.
Claim 46
Dependent Claim
18 words
A method in accordance with claim 42 wherein said depth type filter media comprises metallurgically bonded metal fibers.
Claim 47
Dependent Claim
22 words
A method in accordance with claim 43 wherein said secondary filter means comprises at least one U.S. Standard Sieve 325 mesh screen.
Claim 48
Dependent Claim
21 words
A method in accordance with claim 43 wherein said secondary filter means comprises three superposed U.S. Standard Sieve 325 mesh screens.
Claim 49
Dependent Claim
25 words
A method in accordance with claim 43 wherein said secondary filter means comprises one U.S. Standard Sieve 325 mesh screen and a quantity of sand.
Claim 50
Dependent Claim
17 words
A method in accordance with claim 46 wherein said sand is 20/40 U.S. Standard Sieve mesh sand.
Claim 51
Dependent Claim
17 words
A method in accordance with claim 46 wherein said sand is 60/80 U.S. Standard Sieve mesh sand.
Claim 52
Dependent Claim
15 words
A method in accordance with claim 42 wherein said molten poly(arylene sulfide) comprises poly(phenylene sulfide).
Claim 53
Dependent Claim
26 words
A method in accordance with claim 49 wherein said poly(phenylene sulfide) is characterized further as having a concentration of 1-chloronapthalene insolubles of at least 40 ppm.
Claim 54
Dependent Claim
31 words
A method in accordance with claim 49 wherein said poly(phenylene sulfide) is characterized further as having a melt flow rate in the range from about 50 to about 600 g/10 min.
Claim 55
Dependent Claim
22 words
A method in accordance with claim 42 wherein said poly(arylene sulfide) has a concentration of 1-chloronapthalene insolubles of at least 40 ppm.
Claim 56
Dependent Claim
26 words
A method in accordance with claim 42 wherein said poly(arylene sulfide) has melt flow rate in the range from about 50 to about 600 g/10 min.
Claim 57
Dependent Claim
22 words
A method in accordance with claim 43 wherein said poly(arylene sulfide) has a concentration of 1-chloronapthalene insolubles of at least 40 ppm.
Claim 58
Independent Claim
116 words
A method of processing a polymer comprising the steps of: forcing molten polymer through primary filter means comprising depth type filter media of nonwoven metal fibers having a maximum absolute micron rating of no more than about 125 to provide a first quantity of molten primary filtered polymer; forming said molten primary filtered polymer into a plurality of primary filtered polymer pellets; melting said primary filtered polymer pellets to provide a second quantity of molten primary filtered polymer; and forcing said second quantity of molten primary filtered polymer through secondary filter means having a maximum absolute micron rating of no more than about 80 or a substantially equivalent filtration capacity to provide molten secondary filtered polymer.
Claim 59
Independent Claim
116 words
A method of processing a polymer comprising the steps of: forcing molten polymer through primary filter means comprising depth type filter media of nonwoven metal fibers having a maximum absolute micron rating of no more than about 125 to provide a first quantity of molten primary filtered polymer; forming said molten primary filtered polymer into a plurality of primary filtered polymer pellets; melting said primary filtered polymer pellets to provide a second quantity of molten primary filtered polymer; and forcing said second quantity of molten primary filtered polymer through secondary filter means having a maximum absolute micron rating of no more than about 80 or a substantially equivalent filtration capacity to provide molten secondary filtered polymer.
Claim 60
Dependent Claim
24 words
A method in accordance with claim 55 characterized further to include the step of extruding the secondary filtered polymer into an extruded polymer product.
Claim 61
Dependent Claim
17 words
A method in accordance with claim 55 or claim 56 wherein said molten polymer comprises poly(arylene sulfide).
Claim 62
Dependent Claim
28 words
A method in accordance with claim 55 or claim 56 wherein said molten polymer comprises poly(phenylene sulfide) having a concentration of 1-chloronapthalene insolubles of at least 40 ppm.
Claim 63
Dependent Claim
28 words
A method in accordance with claim 55 or claim 56 wherein said molten polymer comprises poly(arylene sulfide) having a concentration of 1-chloronapthalene insolubles of at least 40 ppm.
Claim 64
Dependent Claim
33 words
A method in accordance with claim 55 or claim 56 wherein said molten polymer comprises poly(arylene sulfide) having a melt flow rate in the range from about 50 to about 600 g/10 min.
Claim 65
Independent Claim
106 words
A method of forming fibers from a polymer comprising poly(arylene sulfide) which has previously been subjected to primary filtration through primary filter means comprising a depth type filter of nonwoven metal fibers having a maximum absolute micron rating of no more than about 125 to form a primary filtered polymer, comprising: melting the primary filtered pellets to provide molten primary filtered polymer and passing said molten primary filtered polymer through secondary filter means having a maximum absolute micron rating of no more than about 80 or a substantially equivalent filtration capacity to provide molten secondary filtered polymer; and thereafter forming fibers from said secondary filtered polymer.
Claim 66
Independent Claim
106 words
A method of forming fibers from a polymer comprising poly(arylene sulfide) which has previously been subjected to primary filtration through primary filter means comprising a depth type filter of nonwoven metal fibers having a maximum absolute micron rating of no more than about 125 to form a primary filtered polymer, comprising: melting the primary filtered pellets to provide molten primary filtered polymer and passing said molten primary filtered polymer through secondary filter means having a maximum absolute micron rating of no more than about 80 or a substantially equivalent filtration capacity to provide molten secondary filtered polymer; and thereafter forming fibers from said secondary filtered polymer.
Claim 67
Dependent Claim
29 words
A method in accordance with claim 61 wherein the polymer has a concentration of 1-chloronapthalene insolubles of at least 40 ppm prior to passage through said primary filter means.
Claim 68
Dependent Claim
37 words
A method in accordance with claim 61 wherein the polymer comprises poly(phenylene sulfide) having a concentration of 1-chloronapthalene insolubles in the range from about 50 to about 300 ppm prior to passage through said primary filter means.
Claim 69
Dependent Claim
34 words
A method in accordance with claim 61 wherein the polymer has a melt flow rate in the range from about 50 to about 600 g/10 min prior to passage through said primary filter means.
Claim 70
Dependent Claim
19 words
A method in accordance with claim 61 wherein said secondary filter means comprises a plurality of superposed mesh screens.
Claim 71
Dependent Claim
32 words
A method in accordance with claim 61 wherein said secondary filter means comprises three superposed mesh screens each having an absolute micron rating in the range from about 59 to about 73.
Claim 72
Dependent Claim
26 words
A method in accordance with claim 61 or claim 42 wherein said secondary filter means comprises at least one mesh screen and a quantity of sand.
Claim 73
Dependent Claim
19 words
A method in accordance with claim 67 wherein said quantity of sand is 20/40 U.S. Standard Sieve mesh sand.
Claim 74
Dependent Claim
19 words
A method in accordance with claim 67 wherein said quantity of sand is 60/80 U.S. Standard Sieve mesh sand.
Claim 75
Dependent Claim
21 words
A method in accordance with claim 61 wherein said secondary filter means comprises three superposed U.S. Standard Sieve 325 mesh screens.
Claim 76
Independent Claim
73 words
A method of processing a polymer comprising poly(arylene sulfide), comprising the steps of: passing molten polymer comprising poly(arylene sulfide) through primary filter means comprising a depth type filter having a maximum absolute micron rating of no more than about 125 to provide molten primary filtered polymer; and passing said molten primary filtered polymer through secondary filter means to remove impurities which pass through said primary filter means and provide molten secondary filtered polymer.
Claim 77
Independent Claim
73 words
A method of processing a polymer comprising poly(arylene sulfide), comprising the steps of: passing molten polymer comprising poly(arylene sulfide) through primary filter means comprising a depth type filter having a maximum absolute micron rating of no more than about 125 to provide molten primary filtered polymer; and passing said molten primary filtered polymer through secondary filter means to remove impurities which pass through said primary filter means and provide molten secondary filtered polymer.
Claim 78
Dependent Claim
17 words
A method in accordance with claim 71 wherein said depth type filter comprises metallurgically bonded metal fibers.
Claim 79
Dependent Claim
26 words
A method in accordance with claim 72 wherein said primary filter means has an absolute micron rating in the range from about 45 to about 125.
Claim 80
Dependent Claim
25 words
A method in accordance with claim 71 wherein said polymer is characterized further as having a concentration of 1-chloronapthalene insolubles of at least 40 ppm.
Claim 81
Dependent Claim
30 words
A method in accordance with claim 71 wherein said polymer is characterized further as having a melt flow rate in the range from about 50 to about 600 g/10 min.
Claim 82
Dependent Claim
19 words
A method in accordance with claim 71 or claim 1 wherein said depth type filter comprises nonwoven metal fibers.
Claim 83
Dependent Claim
37 words
A method in accordance with claim 67 wherein said quantity of sand has a depth sufficient to provide effective filtration of polymer passing therethrough without exceeding an initial pressure of 3000 psig at said second filter means.
Claim 84
Dependent Claim
21 words
A method in accordance with claim 67 wherein said quantity of sand has a depth of at least about % inch.
Claim 85
Dependent Claim
38 words
A method in accordance with claim 67 wherein said quantity of sand consists of particles which will pass through a 16 U.S. Standard Sieve mesh screen and will not pass through a 100 U.S. Standard Sieve mesh screen.
Claim 86
Dependent Claim
40 words
A method in accordance with claim 9 or claim 46 wherein said quantity of sand has a depth sufficient to provide effective filtration of polymer passing therethrough without exceeding an initial pressure of 3000 psig at said second filter means.
Claim 87
Dependent Claim
24 words
A method in accordance with claim 9 or claim 46 wherein said quantity of sand has a depth of at least about k inch.
Claim 88
Dependent Claim
42 words
A method in accordance with claim 9 or claim 46 wherein said quantity of sand consists of particles which will pass through a 1 6 U.S. Standard Sieve mesh screen and will not pass through a 100 U.S. Standard Sieve mesh screen.
Claim 89
Dependent Claim
39 words
Apparatus in accordance with claim 35 or claim 39 wherein said quantity of sand has a depth sufficient to provide effective filtration of polymer passing therethrough without exceeding an initial pressure of 3000 psig at said second filter means.
Claim 90
Dependent Claim
23 words
Apparatus in accordance with claim 35 or claim 39 wherein said quantity of sand has a depth of at least about % inch.
Claim 91
Dependent Claim
40 words
Apparatus in accordance with claim 35 or claim 39 wherein said quantity of sand consists of particles which will pass through a 16 U.S. Standard Sieve mesh screen and will not pass through a 100 U.S. Standard Sieve mesh screen.
Claim 92
Independent Claim
83 words
A method of processing a polymer comprising poly(arylene sulfide) characterized b y the steps of: forcing molten polymer comprising poly(arylene sulfide) through primary filter means comprising a depth type filter having a maximum absolute micron rating of no more than about 125 to provide molten primary filtered polymer; and forcing said molten primary filtered polymer through secondary filter means having a maximum absolute micron rating of no more than about 30 or a substantially equivalent filtration capability to provide molten secondary filtered polymer.
Claim 93
Independent Claim
83 words
A method of processing a polymer comprising poly(arylene sulfide) characterized b y the steps of: forcing molten polymer comprising poly(arylene sulfide) through primary filter means comprising a depth type filter having a maximum absolute micron rating of no more than about 125 to provide molten primary filtered polymer; and forcing said molten primary filtered polymer through secondary filter means having a maximum absolute micron rating of no more than about 30 or a substantially equivalent filtration capability to provide molten secondary filtered polymer.
Claim 94
Dependent Claim
27 words
The method of claim 1 wherein said poly(arylene sulfide) is characterized further as having a melt flow rate in the range from 150 to 400 g/10 min.
Claim 95
Dependent Claim
120 words
Apparatus for processing a polymer comprising, in combination: first means for receiving a quantity of molten polymer from a molten polymer source, said first means comprising primary filter means in the form of a depth type filter comprising metallurgically bonded metal fibers having a maximum absolute micron rating of no more than about 125 for filtering the thus received molten polymer to provide molten primary filtered polymer; and second means for receiving said molten primary filtered polymer from said first means, said second means comprising secondary filter means having a maximum absolute micron rating of no more than about 80 or substantially equivalent filtration capacity for filtering the thus received molten primary filtered polymer to provide molten secondary filtered polymer.
Claim 96
Dependent Claim
120 words
Apparatus for processing a polymer comprising, in combination: first means for receiving a quantity of molten polymer from a molten polymer source, said first means comprising primary filter means in the form of a depth type filter comprising metallurgically bonded metal fibers having a maximum absolute micron rating of no more than about 125 for filtering the thus received molten polymer to provide molten primary filtered polymer; and second means for receiving said molten primary filtered polymer from said first means, said second means comprising secondary filter means having a maximum absolute micron rating of no more than about 80 or substantially equivalent filtration capacity for filtering the thus received molten primary filtered polymer to provide molten secondary filtered polymer.
Claim 97
Dependent Claim
222 words
The embodiment of any of claims 1 to 3 characterized in that the maximum absolute micron rating of said primary filter means is no more than about 100; in particular wherein said metallurgically bonded metal fibers are micronic size stainless steel fibers; in particular wherein said secondary filter means comprises three superposed mesh screens; in particular wherein said mesh screens are U.S.Standard Sieve 325 mesh screens; in particular wherein said primary filter means is characterized further as having an absolute micron rating in the range from 45 to 125, and wherein said secondary filter means comprises three superposed metal mesh screens each having an absolute micron rating in the range from 59 to 73; in particular characterized further to include extruding means operatively connected to said second means for receiving said molten secondary filtered polymer from said second means and extruding the thus received secondary filtered polymer into an extruded product; in particular wherein said primary filter means is characterized further as having an absolute micron rating of about 88, and wherein said secondary filter means comprises three superposed U.S.Standard Sieve325 mesh screens; in particular wherein said primary filter means is characterized further as having an absolute micron rating of about 88, and wherein said secondary filter means comprises one US .Standard Sieve 325 screen (0.044 mm) and a quantity of sand.
Claim 98
Independent Claim
90 words
A method of processing a normally solid thermoplastic polymeric material for melt spinning into fibers comprising the steps of: passing molten poly(arylene sulfide) through primary filter means comprising depth type filter media having an absolute micron rating of no more than about 125 to provide molten primary filtered polymer; and passing said molten primary filtered polymer through secondary filter means having an absolute micron rating less than or a substantially equivalent filtration capacity greater than the absolute micron rating or the substantially equivalent filtration capacity of said primary filter means.
Claim 99
Independent Claim
90 words
A method of processing a normally solid thermoplastic polymeric material for melt spinning into fibers comprising the steps of: passing molten poly(arylene sulfide) through primary filter means comprising depth type filter media having an absolute micron rating of no more than about 125 to provide molten primary filtered polymer; and passing said molten primary filtered polymer through secondary filter means having an absolute micron rating less than or a substantially equivalent filtration capacity greater than the absolute micron rating or the substantially equivalent filtration capacity of said primary filter means.
Claim 100
Dependent Claim
74 words
The embodiment of any of the preceding claims characterized in that said secondary filter means comprises at least one U.S.Standard Sieve 325 mesh screen (0.044 mm); in particular wherein said secondary filter means comprises one U.S.Standard Sieve 325 mesh screen (0.044 mm) and a quantity of sand; in particular wherein said molten poly(arylene sulfide) comprises poly(phenylene sulfide); in particular wherein said poly(arylene sulfide) has a concentration of 1-chloronaphthalene insolubles of at least 40 ppm.
Claim 101
Independent Claim
116 words
A method of processing a polymer comprising the steps of: forcing molten polymer through primary filter means comprising depth type filter media of nonwoven metal fibers having a maximum absolute micron rating of no more than about 125 to provide a first quantity of molten primary filtered polymer; forming said molten primary filtered polymer into a plurality of primary filtered polymer pellets; melting said primary filtered polymer pellets to provide a second quantity of molten primary filtered polymer; and forcing said second quantity of molten primary filtered polymer through secondary filter means having a maximum absolute micron rating of no more than about 80 or a substantially equivalent filtration capacity to provide molten secondary filtered polymer.
Claim 102
Independent Claim
116 words
A method of processing a polymer comprising the steps of: forcing molten polymer through primary filter means comprising depth type filter media of nonwoven metal fibers having a maximum absolute micron rating of no more than about 125 to provide a first quantity of molten primary filtered polymer; forming said molten primary filtered polymer into a plurality of primary filtered polymer pellets; melting said primary filtered polymer pellets to provide a second quantity of molten primary filtered polymer; and forcing said second quantity of molten primary filtered polymer through secondary filter means having a maximum absolute micron rating of no more than about 80 or a substantially equivalent filtration capacity to provide molten secondary filtered polymer.
Claim 103
Dependent Claim
58 words
The embodiment of any of the preceding claims characterized further to include the step of extruding the secondary filtered polymer into an extruded polymer product; in particular wherein said molten polymer comprises poly (arylene sulfide); in particular wherein said molten polymer comprises poly(arylene sulfide) having a melt flow rate in the range from 50 to 600 g/10 min.
Claim 104
Independent Claim
107 words
A method of forming fibers from a polymer comprising poly (arylene sulfide) which has previously been subjected to primary filtration through primary filter means comprising a depth type filter of nonwoven metal fibers having a maximum absolute micron rating of no more than about 125 to form a primary filtered polymer; comprising: melting the primary filtered pellets to provide molten primary filtered polymer and passing said molten primary filtered polymer through secondary filter means having a maximum absolute micron rating of no more than about 80 or a substantially equivalent filtration capacity to provide molten secondary filtered polymer; and thereafter forming fibers from said secondary filtered polymer.
Claim 105
Independent Claim
107 words
A method of forming fibers from a polymer comprising poly (arylene sulfide) which has previously been subjected to primary filtration through primary filter means comprising a depth type filter of nonwoven metal fibers having a maximum absolute micron rating of no more than about 125 to form a primary filtered polymer; comprising: melting the primary filtered pellets to provide molten primary filtered polymer and passing said molten primary filtered polymer through secondary filter means having a maximum absolute micron rating of no more than about 80 or a substantially equivalent filtration capacity to provide molten secondary filtered polymer; and thereafter forming fibers from said secondary filtered polymer.
Claim 106
Dependent Claim
147 words
The embodiment of any of the preceding claims characterized in that the polymer comprises poly(phenylene sulfide) having a concentration of 1-chloronaphthalene insolubles in the range from 50 to 300 ppm prior to passage through said primary filter means; in particular wherein ' said secondary filter means comprises a plurality of superposed mesh screens; in particular wherein said secondary filter means comprises three superposed mesh screens each having an absolute micron rating in the range from 59 to 73; in particular wherein said secondary filter means comprises at least one mesh screen and a quantity of sand; in particular wherein said quantity of sand is 20/40 U.S.Standard Sieve mesh (0.42 - 0.84 mm) sand; in particular wherein said quantity of sand is 60/80 U.S. Standard Sieve mesh (0.177 - 0.250 mm); in particular wherein said secondary filter means comprises three superposed U.S.Standard Sieve 325 mesh screens (0.044 mm).
Claim 107
Independent Claim
73 words
A method of processing a polymer comprising poly(arylene sulfide), comprising the steps of: passing molten polymer comprising poly(arylene sulfide) through primary filter means comprising a depth type filter having a maximum absolute micron rating of no more than about 125 to provide molten primary filtered polymer; and passing said molten primary filtered polymer through secondary filter means to remove impurities which pass through said primary filter means and provide molten secondary filtered polymer.
Claim 108
Independent Claim
73 words
A method of processing a polymer comprising poly(arylene sulfide), comprising the steps of: passing molten polymer comprising poly(arylene sulfide) through primary filter means comprising a depth type filter having a maximum absolute micron rating of no more than about 125 to provide molten primary filtered polymer; and passing said molten primary filtered polymer through secondary filter means to remove impurities which pass through said primary filter means and provide molten secondary filtered polymer.
Claim 109
Dependent Claim
169 words
The embodiment of any of the preceding claims characterized in that said depth type filter comprises metallurgically bonded metal fibers; in particular wherein said primary filter means has an absolute micron rating in the range from 45 to 125; in particular wherein said polymer is characterized further as having a concentration of 1-chloronaphthalene insolubles of at least 40 ppm; in particular wherein said polymer is characterized further as having a melt flow rate in the range from 50 to 600 g/10 min.; in particular wherein said quantity of sand has a depth sufficient to provide effective filtration of polymer passing therethrough without exceeding an initial pressure of 300 psig (20.7 MPa) at said second filter means; in particular wherein said quantity of sand has a depth of at least about 1/4 inch (6.4 mm); in particular wherein said quantity of sand consists of particules which will pass through a 16 U.S.Standard Sieve mesh screen (1.19 mm) and will not pass through a 100 U.S.Standard Sieve mesh screen (0.149 mm).
References Cited (Backward Citations)
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