US4749752A
Expired / Lapsed
US
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Fluoropolymer alloys
Assignee: Shanghai Institute of Organic Chemistry
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Filing: 1986-03-24
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Granted: 1988-06-07
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Expires: 2006-03-24
Abstract
Abstract 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, the weight percentage of the former is 0.1-99.9% and the latter is 99.9-0.1% respectively. The processes for preparing the fluoropolymer alloys are dried powder co-mill or wetted powder co-mill. Using the fluoropolymer alloys of this invention various kinds of articles have been fabricated by melt compression or cold compaction and sintering. These articles show a great improvement in creep property and also a prolonged service life in comparison with those made from ordinary polytetrafluoroethylene.
Inventors
- 👤 Duan Youlu
- 👤 Jin Shanrong
- 👤 Huang Tingchun
- 👤 Sun Jin
- 👤 Yu Xinying
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:07
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: 17
Claim 1
Independent Claim
77 words
Fluoropolymer alloys, which comprises the melt fabricatable extra-high-molecular weight fluorinated ethylene-propylene copolymer (EHMW-FEP) and one or more other polymers selected from the group consisting of polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinylidene fluoride, tetrafluoroethylene-ethylene copolymer, polysulfone, polyethylene, polypropylene, polyimide, polycarbonate, polyphenylene oxide and polyphenylene sulfide, said (EHMW-FEP) being a copolymer of tetrafluoroethylene and about 12 to 30% by weight of hexafluoropropylene having a melt viscosity of more than 1×10 6 poises, and melt flow index of less than 0.8 gram/10 minute.
Claim 2
Dependent Claim
77 words
Fluoropolymer alloys, which comprises the melt fabricatable extra-high-molecular weight fluorinated ethylene-propylene copolymer (EHMW-FEP) and one or more other polymers selected from the group consisting of polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinylidene fluoride, tetrafluoroethylene-ethylene copolymer, polysulfone, polyethylene, polypropylene, polyimide, polycarbonate, polyphenylene oxide and polyphenylene sulfide, said (EHMW-FEP) being a copolymer of tetrafluoroethylene and about 12 to 30% by weight of hexafluoropropylene having a melt viscosity of more than 1×10 6 poises, and melt flow index of less than 0.8 gram/10 minute.
Claim 3
Dependent Claim
12 words
The fluoropolymer alloy as in claim 1, which comprises EHMW-FEP and polytetrafluoroethylene.
Claim 4
Dependent Claim
28 words
The fluoropolymer alloy, as in claim 2 wherein the weight percent of extra-high-molecular weight fluorinated ethylene-propylene co-polymer EHMW-FEP is 0.1-60, and the weight percent of polytetrafluoroethylene if 99.9-40%.
Claim 5
Dependent Claim
24 words
The fluoropolymer alloy as in claim 1, further comprising one of the group selected from glass fiber, graphite, molyldenum disulfide, carbon and metal powder.
Claim 6
Dependent Claim
23 words
The fluoropolymer alloy, as in claim 1 wherein the alloy has a tensile strength of 270 kg/cm 2 or greater at room temperature.
Claim 7
Dependent Claim
99 words
The fluoropolymer alloy as in claim 1 wherein the EHMW-FEP is prepared by solution precipitation polymerization using liquid hexafluoropropylene as a solvent, comprising charging 0.2-0.5 g of tetrafluoroethylene and hexafluoropropylene per 1 ml autoclave capacity into a autoclave, the monomer mixture of tetrafluoroethylene and hexafluoropropylene containing 11-50% by weight of tetrafluoroethylene, the weight ratio between water and monomers is 3:1 to 1:1, equivalents of initiator diisopropyl peroxy dicarbonate based on monomers being 0.001 to 0.05% at a polymerization pressure of 2-30 Kg/cm 2 , polymerization temperature of 40° to 80° C. and polymerization time of 1-5 hours a batch.
Claim 8
Dependent Claim
87 words
A process for preparing fluropolymer alloys of melt fabricatable extra-high-molecular weight fluorinated ethylene-propylene copolymer (EHMW-FEP) and one or more other polymers selected from he group consisting of polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinylidene fluoride, tetrafluoroethylene-ethylene copolymer, polysulfone, polyethylene, polypropylene, polyimide, polycarbonate, polyphenylene oxide and polyphenylene sulfide, said (EHMW-FEP) being a copolymer of tetrafluoroethylene and about 12 to 30% by weight of hexafluoropropylene having a melt viscosity of more than 1×10 6 poises, and melt low index of less than 0.8 gram/10 minute, comprising powder co-mill drying or wetted powder CO-milling.
Claim 9
Dependent Claim
87 words
A process for preparing fluropolymer alloys of melt fabricatable extra-high-molecular weight fluorinated ethylene-propylene copolymer (EHMW-FEP) and one or more other polymers selected from he group consisting of polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinylidene fluoride, tetrafluoroethylene-ethylene copolymer, polysulfone, polyethylene, polypropylene, polyimide, polycarbonate, polyphenylene oxide and polyphenylene sulfide, said (EHMW-FEP) being a copolymer of tetrafluoroethylene and about 12 to 30% by weight of hexafluoropropylene having a melt viscosity of more than 1×10 6 poises, and melt low index of less than 0.8 gram/10 minute, comprising powder co-mill drying or wetted powder CO-milling.
Claim 10
Dependent Claim
31 words
The process as in claim 7 wherein the alloy is prepared by powder co-mill drying, mixing the polymers, milling the mixture again until homogenous, and passing through a 40 mesh screen.
Claim 11
Dependent Claim
52 words
The process as in claim 7 wherein the alloy is prepared by wetted powder co-milling comprising moistening the EHMW-FEP and one or more other polymer with one of the group consisting of water, ethyl alcohol, ethyl acetate or a mixed solvent thereof, milling, blending until homogeneous, filtering, drying and 40 mesh screening.
Claim 12
Dependent Claim
41 words
A fluoropolymer alloy as in claim 1 the alloy being capable of fabrication of one of the group consisting of melt compression, cold compaction and sintering, powder coating, powder coating of flow-bed, or ram-extruding of paste of dried powder and moistener.
Claim 13
Dependent Claim
25 words
The fluoropolymer alloy as in claim 10 fabricated by melt compression for at a temperature of 300°-350° C. and pressure of 50-200 Kg/cm 2 .
Claim 14
Dependent Claim
28 words
The fluoropolymer alloy as in claim 1 fabricated by cold compaction and sintering at a cold compression pressure of 50-200 Kg/cm 2 and sintering temperature of 300°-390° C.
Claim 15
Dependent Claim
24 words
The fluoropolymer alloy as in claim 1 fabricated by ram-extruding paste of dried powder and moistener using petroleum ether or kerosene as a moistener.
Claim 16
Dependent Claim
35 words
The fluoropolymer alloy as claimed in claim 1 which may be fabricated into one of the group consisting of diaphrams, seals, lining valves, lining pipes, lining pumps, shell and wheel of corossive-resistance pump, wind-wrap wire.
Claim 17
Dependent Claim
20 words
The fluropolymer alloy as claimed in claim 1 wherein the EHMW-FEP has an average molecular weight of 2×10 5 .
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-07 | 1991-12-07 | 1992-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-07 | 1995-12-07 | 1996-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-07 | 1999-12-07 | 2000-06-07 | $7700.00 | Window Closed / Lapsed |