EP0199991A2
Expired / Lapsed
EP
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Fluoropolymer alloys, their preparation and application
Assignee: Shanghai Institute of Organic Chemistry
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Filing: 1986-03-25
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Granted: —
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Expires: 2006-03-25
Abstract
Abstract @ This invention relates to fluoropolymer alloys made of melt fabricatable extra-high-molecular weight fluorinated ethylene-propylene copolymer (EHMW-FEP) and one or more other polymers. In fluoropolymer alloys made of EHMW-FEP and polytetrafluoroethylene, weight percentage of the former is 0.1-99.9% and the latter is 99.9-0.1%. The processes for preparing fluoropolymer alloys are blend of dried powder co-mill or wetted powder co-mill, Using the fluoropolymer alloys of this invention, various kinds of articles have been fabricates by melt compression or cold compaction and sintering. These properly fabricated arti- cales show a great improvement in creep property and also a prolonged service life in comparision with those made from ordinary polytetrafluoroethylene.
Inventors
- 👤 Duan Youlu
- 👤 Ji Shanrong
- 👤 Huang Tingchun
- 👤 Yu Xiongying
- 👤 Sun Jin
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 12:49
CPC Classifications
C; C08; C08L; C08L27/00; C08L27/02; C08L27/12; C08L27/18; C08L27/20; C08L23/00; C08L23/26; C08L23/28
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
36 words
Fluoropolymer alloys, which comprises the melt fabricatable extra-high-molecular weight fluorinated ethylene-propylene and one or more other polymers, such as polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinylidene fluoride, tetrafluoroethylene-ethylene copolymer, polysulfone, polyethylene, polypropylene, polyimide, polycarbonate, polyphenylene oxide or polypheny lene sulfide.
Claim 2
Dependent Claim
36 words
Fluoropolymer alloys, which comprises the melt fabricatable extra-high-molecular weight fluorinated ethylene-propylene and one or more other polymers, such as polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinylidene fluoride, tetrafluoroethylene-ethylene copolymer, polysulfone, polyethylene, polypropylene, polyimide, polycarbonate, polyphenylene oxide or polypheny lene sulfide.
Claim 3
Dependent Claim
55 words
The fluoropolymer alloys as claimed in claim 1, wherein the molding powder is extra-high-molecular weight fluorinated ethlene-propylene copolymer which can be melt fabricated, with 12-30% by weight of hexafluoropropylene, weight-average molecular weight of over 2 x 10 melt viscosity of more than 1 x 10 6 poises, melt flow index less than 0.8 gram/10 minute.
Claim 4
Dependent Claim
21 words
The fluoropolymer alloys as claimed in claim 1, which comprises extra-high-molecular weight fluorinated ethylene-propylene copolymer and polytetrafluoroethylene in any weight ratio.
Claim 5
Dependent Claim
23 words
The fluoropolymer alloys as claimed in claim 3 characterised by having weight ratio of 0.1-60% extra-high-molecular weight fluorinated ethylene-propylene copolymer and 99.9-40% polytetrafluoroethylene.
Claim 6
Dependent Claim
23 words
The fluoropolymer alloys as claimed in claim 1,2,3 or 4, wherein glass fiber, graphite, molybdenum disulfide, carbon or metal powder may be added.
Claim 7
Dependent Claim
19 words
A process for preparing the fluoropolymer alloys as claimed in claiml, either dried powder co-mill or wetted ,powder CO-mill.
Claim 8
Dependent Claim
72 words
The process of dried powder co-mill for preparing fluoropolymer alloys as claimed in claim 6 characterised by comprising milling extra-high-molecular weight fluorinated ethlene-propylene copolymer and one or more other polymers, such as polytetrafluoroethylene, polychlorotrfiluoroe- thylene, polyvinylidens fluoride, tetrafluoroethylene-ethylene copolymer, polyethylene, polypropylene, polysulfone, polyimide, polycarbonate, polyphenylene oxide or polyphenylene sulfide separately, and then mixing the polymers in a given weight ratio and milling the mixture again until homogeneously, passing through 40 mesh screen.
Claim 9
Dependent Claim
79 words
The process of wetted powder co-mill for preparing fluoropolymer alloys as claimed in claim 6 characterised comprising by moistenning a given amount of extra-high-molecular weight fluorinated ethlene-propylene copolymer and at least one or more other polymers, such as polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinylidene fluoride, tetrafluoroethylene-ethylene copolymer, polyethylene, polypropylene, polysulfone, polyimide, polycarbonate, polyphenylene oxide or polyphenylene sulfide by water, ethyl alcohol, ethyl acetate or a mixed solvent of them and then milling and blending until homogeneously, filtering, drying, finally 40 mesh screening.
Claim 10
Dependent Claim
37 words
The fluoropolymer alloys as claimed in claim 1 or 6, which can be fabricated by melt compression, cold compaction and sintering, powder coating, powder coating of flow-bed, or ram-extruding of paste consisting of dried powder and moistener.
Claim 11
Dependent Claim
25 words
The process of melt compression for fluoropolymer alloys as claimed in claim 9 characterised by temperature of 300-350 C and pressure of 50-200 Kg/cm 2.
Claim 12
Dependent Claim
32 words
The precess of cold compaction and sintering for fuoropolymer alloys as claimed in claim 9 characterised by cold compressing under pressure of 50-200 Kg/cm 2 and sintering under temperature of 300-390 C.
Claim 13
Dependent Claim
30 words
The process of ram-extruding of paste consisting of dried powder and moistener for fluoropolymer alloys as claimed in claim 9 characterised by using petroleum ether of kerosene as a moistener.
Claim 14
Dependent Claim
47 words
The fluoropolymer alloys claimed in claim 1,2,3,4 or 5, which may be fabricated into various articles such as diaphrams, seals, lining valves, lining pipes, lining pumps, shell and wheel of corossive-resistance pump, wind- wrap wire, they exhibite excellent thermal stability, chemical inertness and outstanding electrical insulating properties.
Claim 15
Dependent Claim
111 words
The process for preparing extra-high-molecular waight fluorinated ethylene-propylene copolymer suitable for melt fabrication as claimed in claim 1 or 2, which comprises a solution precipitation polymerization using liquid hexafluoropropylene as a solvent, which are characterised by charging 0.2-0.5 g of tetrafluoroethylene and hexafluoropropylene per 1 ml autoclave capacity into a ,autoclave, and the monomer mixture of tetrafluoroethylene and hexafluoropropylene containing 11-50% by weight of tetrafluoroethylene, the weight ratio between water and monomers in 3:1 to 1:1, equivalents of initiator diisopropyl peroxy dicarbonate based on monomers being, 0.001 to 0.05% the polymerization pressure of 20-30 Kg/cm 2 , polymerization temperature of 40 to 80°C and polymerization time of 1-5 hours a batch.
References Cited (Backward Citations)
No citation records indexed.
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