US5102591A
Expired / Lapsed
US
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Method for removing volatile substances from polyphenylene ether resin blends
Assignee: SABIC Global Technologies BV
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Filing: 1989-12-27
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Granted: 1992-04-07
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Expires: 2009-12-27
Abstract
Abstract A method for removing volatile substances from polyphenylene ether (PPE) resin blends in an extruder comprising adding a second thermoplastic resin downstream from the PPE feedport and one stage of water injection followed by vacuum venting is disclosed.
Inventors
- 👤 Alexandros Hasson
- 👤 Raymond J. Gerhart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:01
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08G65/46; B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/76; B29C48/78; B29C48/80; B29C48/83; B29C48/832; B29C48/834; B29C48/86; B29C48/865; C08L; C08L71/00; C08L71/08; C08L71/10; C08L71/12; C08L71/123; B29C48/03; B29C48/04; B29C48/07; B29C48/762; C08L67/00; C08L69/00; C08L77/00; C08L81/00; C08L81/04; Y; Y10; Y10S; Y10S525/00; Y10S525/905
Claims Analysis
Total Claims: 47
Claim 1
Independent Claim
110 words
A process for the reduction of volatile substances in a composition comprising: (i) a polyphenylene ether resin; and (ii) a polystyrene resin said process comprising: (a) delivering a polyphenylene ether resin comprising impurities selected from toluene, volatile oxygenated species, and sources of volatile odoriferous amines to an extruder; (b) melting and extruding said polyphenylene ether with at least one stage of water injection followed by vacuum venting; (c) feeding said polystyrene resin (ii) into said extruder at a point on the extruder downstream of the first stage of water injection followed by vacuum venting; (d) blending the polyphenylene ether and styrene resins in the extruder; and (e) recovering said composition.
Claim 2
Dependent Claim
110 words
A process for the reduction of volatile substances in a composition comprising: (i) a polyphenylene ether resin; and (ii) a polystyrene resin said process comprising: (a) delivering a polyphenylene ether resin comprising impurities selected from toluene, volatile oxygenated species, and sources of volatile odoriferous amines to an extruder; (b) melting and extruding said polyphenylene ether with at least one stage of water injection followed by vacuum venting; (c) feeding said polystyrene resin (ii) into said extruder at a point on the extruder downstream of the first stage of water injection followed by vacuum venting; (d) blending the polyphenylene ether and styrene resins in the extruder; and (e) recovering said composition.
Claim 3
Dependent Claim
18 words
A process as defined in claim 1 wherein said polyphenylene ether resin (i) comprises poly(2,6-dimethyl-1,4-phenylene)ether, poly(2,3,6-trimethyl-1,4-phenylene)ether, or poly(2,6-dimethyl-co-2,3,6-trimethyl-1,4-phenylene)ether.
Claim 4
Dependent Claim
15 words
A process as defined in claim 2 wherein said polyphenylene ether resin (i) comprises poly(2,6-dimethyl-1,4-phenylene)ether.
Claim 5
Dependent Claim
37 words
A process as defined in claim 1 wherein said component (ii) is selected from the group consisting of a polyolefin, a polycarbonate, a polyester, a polyamide, a polyphenylene sulfide and a mixture of any of the foregoing.
Claim 6
Dependent Claim
15 words
A process as defined in claim 1 wherein said polystyrene resin comprises principally atactic polystyrene.
Claim 7
Dependent Claim
17 words
A process as defined in claim 1 wherein said polystyrene resin comprises a rubber modified styrene polymer.
Claim 8
Dependent Claim
13 words
A process as defined in claim 4 wherein said polycarbonate comprises poly(bisphenol-A) carbonate.
Claim 9
Dependent Claim
19 words
A process as defined in claim 4 wherein said polyester comprises poly(ethylene terephthalate), poly(1,4-butylene terephthalate) or a mixture thereof.
Claim 10
Dependent Claim
20 words
A process as defined in claim 4 wherein said thermoplastic resin comprises a mixture of a polycarbonate and a polyester.
Claim 11
Dependent Claim
18 words
A process as defined in claim 1 wherein said polyphenylene ether resin (i) comprises a functionalized polyphenylene ether.
Claim 12
Dependent Claim
35 words
A process as defined in claim 10 wherein the functionalizing agent is selected from the group consisting of fumaric acid, maleic anhydride, citric acid, trimellitic anhydride acid chloride and mixtures of any of the foregoing.
Claim 13
Dependent Claim
16 words
A process as defined in claim 4 wherein said component (ii) is comprises a polyamide resin.
Claim 14
Dependent Claim
53 words
A process as defined in claim 1 wherein effective amounts of additives selected from the group consisting of impact modifiers, flame retardants, stabilizers for thermal and color stability, antioxidants, pigments, process aids, plasticizers, reinforcing and extending fillers, antistatic agents, lubricants and mixtures of any of the foregoing are also added in step (a).
Claim 15
Dependent Claim
21 words
A process as defined in claim 1 wherein during step (b) the temperature in the extruder is above about 280° C.
Claim 16
Dependent Claim
24 words
A process as defined in claim 1 wherein during step (d) the melt temperature of the two resins is less than about 350° C.
Claim 17
Dependent Claim
22 words
A process as defined in claim 1 wherein in step (b) there are two stages of water injection followed by vacuum venting.
Claim 18
Dependent Claim
19 words
A process as defined in claim 1 wherein the water injected in step (b) is liquid water or steam.
Claim 19
Dependent Claim
32 words
A process as defined in claim 1 wherein in step (b) the total amount of water injected is from about 0.25 to about 15 percent by weight of the polyphenylene ether resin.
Claim 20
Dependent Claim
32 words
A process as defined in claim 1 wherein in step (b) the total amount of water injected is from about 0.5 to about 5 percent by weight of the polyphenylene ether resin.
Claim 21
Dependent Claim
24 words
A process as defined in claim 1 wherein the pressure during extrusion is in the range of from about 550 to about 720 torr.
Claim 22
Dependent Claim
39 words
A process as defined in claim 1 wherein an effective amount of a nucleating agent selected from an organic or inorganic particulate material thereof is added to the composition to induce bubble formation and increase surface area during devolatilization.
Claim 23
Dependent Claim
28 words
A process as defined in claim 21 wherein said nucleating agent comprises talc in an amount of up to about 2 percent by weight based on said composition.
Claim 24
Dependent Claim
27 words
A process as defined in claim 1 including in step (b) injecting carbon dioxide into the extruder in at least one injection followed by vacuum venting stage.
Claim 25
Dependent Claim
32 words
A process as defined in claim 1 including setting the vacuum vent pressure such that the vapor velocity through the vent or vents is kept below about 5-6 meter sec -1 .
Claim 26
Dependent Claim
44 words
A process as defined in claim 1 wherein said composition comprises from about 2 to about 98 parts by weight polyphenylene ether resin and from about 98 to about 2 parts by weight polystyrene resin based on the weight of the two resins combined.
Claim 27
Dependent Claim
44 words
A process as defined in claim 25 wherein said composition comprises from about 20 to about 80 parts by weight polyphenylene ether resin and from about 80 to about 20 parts by weight polystyrene resin based on the weight of the two resins combined.
Claim 28
Dependent Claim
36 words
A process as defined in claim 26 wherein said composition comprises about 50 parts by weight polyphenylene ether resin and about 50 parts by weight polystyrene resin based on the weight of the two resins combined.
Claim 29
Dependent Claim
23 words
A process as defined in claim 1 wherein step (c) further comprises at least one stage of water injection followed by vacuum venting.
Claim 30
Dependent Claim
15 words
A process as defined in claim 28 wherein said water comprises liquid water or steam.
Claim 31
Dependent Claim
30 words
A process as defined in claim 28 wherein the amount of water injected in step (c) is from about 1 to about 10 percent by weight of the two resins.
Claim 32
Dependent Claim
27 words
A process as defined in claim 28 including injecting carbon dioxide into the extruder in at least one injection followed by vacuum venting stage in step (c).
Claim 33
Dependent Claim
35 words
A process as defined in claim 28 including setting the vacuum vent pressure of step (c) such that the vapor velocity through the vent or vents is kept below about 5-6 meter sec -1 .
Claim 34
Dependent Claim
22 words
A process as defined in claim 1 wherein a relatively minor portion of the polystyrene resin (ii) is added in step (a).
Claim 35
Dependent Claim
17 words
A process as defined in claim 1 wherein said extruder is a single or twin screw extruder.
Claim 36
Dependent Claim
17 words
A process as defined in claim 1 wherein step (e) further comprises shaping the low odor composition.
Claim 37
Dependent Claim
18 words
A process as defined in claim 35 wherein said step (e) further comprises pelletizing said low odor composition.
Claim 38
Dependent Claim
17 words
A process as defined in claim 35 wherein said step (e) comprises foaming said low odor composition.
Claim 39
Dependent Claim
32 words
A process as defined in claim 35 wherein said step (e) further comprises extruding said composition through a die to form a solid sheet having very low odor in human organoleptic tests.
Claim 40
Dependent Claim
24 words
A process as defined in claim 37 wherein said composition comprises a foamed sheet or board having very low odor in human organoleptic tests.
Claim 41
Dependent Claim
32 words
A process as defined in claim 35 wherein said step (e) further comprises extruding said composition through a die to form an extruded article having very low odor in human organoleptic tests.
Claim 42
Dependent Claim
29 words
A process as defined in claim 35 wherein said step (e) further comprises molding said composition to form a molded article having very low odor in human organoleptic tests.
Claim 43
Dependent Claim
15 words
A low odor polyphenylene ether/polystyrene pellet produced by the process as defined in claim 35.
Claim 44
Dependent Claim
18 words
A low odor polyphenylene ether/polystyrene foamed sheet or board produced by the process as defined in claim 39.
Claim 45
Dependent Claim
16 words
A low odor polyphenylene ether/polystyrene solid sheet produced by the process as defined in claim 38.
Claim 46
Dependent Claim
16 words
A low odor polyphenylene ether/polystyrene extruded article produced by the process as defined in claim 40.
Claim 47
Dependent Claim
15 words
A low odor polyphenylene/polystyrene molded article produced by the process as defined in claim 41.
References Cited (Backward Citations)
US3633880A
Cited
US3742093A
Cited
US4504338A
Cited
US4369278A
Cited
US4746482A
Cited
US4806297A
Cited
US4831115A
Cited
US4992222A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-04-07 | 1995-10-07 | 1996-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-07 | 1999-10-07 | 2000-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-07 | 2003-10-07 | 2004-04-07 | $7700.00 | Window Closed / Lapsed |