US4496682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Curable fluoropolymer containing aromatic amine
Assignee: EIDP Inc
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Filing: 1984-02-29
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Granted: 1985-01-29
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Expires: 2004-02-29
Abstract
Abstract A curable fluoropolymer composition containing a polyhydroxy aromatic compound press-cure crosslinking agent, and a postcure crosslinking agent selected from aromatic diamines, and bisamines having the formula ##STR1## where A is a divalent radical and x is zero or 1, and the process of curing such a composition by partially curing in a confining zone, and then postcuring.
Inventors
- 👤 Walter W. Schmiegel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:43
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/17; C08K5/18; C08K13/00; C08K13/02
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
206 words
A fluoroelastomer composition comprising: A. An elastomeric copolymer of vinylidene fluoride and at least one other fluorinated monomer, B. a vulcanization accelerator selected from the class consisting of quaternary phosphonium compounds and quaternary ammonium compounds, C. a metal compound selected from the group consisting of divalent metal oxides, divalent metal hydroxides, and mixtures of such oxides or hydroxides with metal salts of weak acids, D. a press-cure crosslinking agent selected from the class consisting of a bisphenol or an ammonium or a phosphonium salt thereof or a polyhydroxy phenol of the formula: ##STR22## where R' is H or akyl or aryl, or of the formula: ##STR23## and E. a postcure cross-linking agent having the formula: ##STR24## where A is a divalent radical selected from the group consisting of ##STR25## and x is zero or 1, but if x is zero then y is not zero; E is selected from the group consisting of ##STR26## F, Cl, Br, I, --CF 3 , --NO 2 , and --CN; D is selected from the class consisting of R' and E; R is alkylene, or arylene; R' is alkyl, aryl or H; and y is zero, 1, 2, 3 or 4; and z is zero, 1, 2, 3, or 4.
Claim 2
Dependent Claim
206 words
A fluoroelastomer composition comprising: A. An elastomeric copolymer of vinylidene fluoride and at least one other fluorinated monomer, B. a vulcanization accelerator selected from the class consisting of quaternary phosphonium compounds and quaternary ammonium compounds, C. a metal compound selected from the group consisting of divalent metal oxides, divalent metal hydroxides, and mixtures of such oxides or hydroxides with metal salts of weak acids, D. a press-cure crosslinking agent selected from the class consisting of a bisphenol or an ammonium or a phosphonium salt thereof or a polyhydroxy phenol of the formula: ##STR22## where R' is H or akyl or aryl, or of the formula: ##STR23## and E. a postcure cross-linking agent having the formula: ##STR24## where A is a divalent radical selected from the group consisting of ##STR25## and x is zero or 1, but if x is zero then y is not zero; E is selected from the group consisting of ##STR26## F, Cl, Br, I, --CF 3 , --NO 2 , and --CN; D is selected from the class consisting of R' and E; R is alkylene, or arylene; R' is alkyl, aryl or H; and y is zero, 1, 2, 3 or 4; and z is zero, 1, 2, 3, or 4.
Claim 3
Dependent Claim
24 words
The composition of claim 1 in which the component E is a bisamine, A is ##STR27## and the amine groups are in the 4,4'-position.
Claim 4
Dependent Claim
59 words
The composition of claim 1 in which for each 100 parts by weight of component A there are about 0.1 to 3 parts by weight of component B, about 1 to 20 parts by weight of component C, about 0.5 to 6 parts by weight of component D, and about 0.2 to 6 parts by weight of component E.
Claim 5
Dependent Claim
26 words
The composition of claim 3 in which the fluoroelastomer is a terpolymer of vinylidene fluoride, hexafluoropropylene and tetrafluoroethylene, or a dipolymer of vinylidene fluoride and hexafluoropropylene.
Claim 6
Dependent Claim
13 words
The composition of claim 4 in which the vulcanization accelerator is benzyltriphenylphosphonium chloride.
Claim 7
Dependent Claim
15 words
The composition of claim 5 in which the postcure crosslinking agent has the formula: ##STR28##
Claim 8
Dependent Claim
15 words
The composition of claim 5 in which the postcure crosslinking agent has the formula: ##STR29##
Claim 9
Dependent Claim
14 words
The composition of claim 1 in which the presscure crosslinking agent is 4,4'-hexafluoroisopropylidene diphenol.
Claim 10
Dependent Claim
14 words
The composition of claim 4 in which the vulcanization accelerator is methyltricapryl ammonium chloride.
Claim 11
Dependent Claim
79 words
A process of curing the fluoroelastomer composition of claim 1 which comprises heating said composition in a confining zone for a time and at a first temperature such that the fluoroelastomer is partially cured to a level such that it has a press cure elongation at break of not greater than about 500% at room temperature, removing the partially cured fluoroelastomer from the confining zone, and then further curing said fluoroelastomer at a higher temperature than said first temperature.
Claim 12
Dependent Claim
25 words
The process of claim 10 in which the confining zone is a mold, the first temperature is between about 160° C. and about 210° C.
Claim 13
Dependent Claim
20 words
The process of claim 9 in which the further curing is carried out at a temperature above about 220° C.
Claim 14
Dependent Claim
18 words
The process of claim 10 in which the fluoroelastomer is a terpolymer of vinylidene fluoride, hexafluoropropylene and tetrafluoroethylene.
Claim 15
Dependent Claim
17 words
The process of claim 10 in which the fluoroelastomer is a copolymer of vinylidene fluoride and hexafluororopylene.
Claim 16
Dependent Claim
19 words
The process of claim 10 in which the fluoroelatomer is a tetrapolymer of vinylidene fluoride, hexafluoropropylene, tetrafluoroethylene, and 4-bromo-3,3,4,4-tetrafluoro-butene-1.
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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) | 1988-01-29 | 1988-07-30 | 1989-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-29 | 1992-07-30 | 1993-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-29 | 1996-07-30 | 1997-01-29 | $7700.00 | Window Closed / Lapsed |