Patent US3933732A successfully refreshed from Google Patents.
US3933732A
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Fluoroelastomer composition and curing process
Assignee: EIDP Inc
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Filing: 1974-05-14
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Granted: 1976-01-20
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Expires: 1994-05-14
Abstract
Abstract A fluoroelastomer composition which has beneficial utility in the rapid manufacture of cured fluoroelastomer articles having good strength and resistance to compression set can be prepared by blending the following components: (A) an elastomeric copolymer of vinylidene fluoride and another fluorine-containing monomer, and (B) as a vulcanization agent, a carboxylic acid ester of 4,4'-sulfonylidiphenol (for example, 4,4'-sulfonyldiphenol diacetate); and when making the cured articles, it is also preferred to add (C) a suitable metal compound such as a divalent metal oxide or hydroxide, and (D) a suitable accelerator, for example a certain type of quaternary phosphonium compound.
Inventors
- 👤 Walter Werner Schmiegel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:42
CPC Classifications
C; C08; C08L; C08L27/00; C08L27/02; C08L27/12; C08L27/16; C08K; C08K5/00; C08K5/36; C08K5/41
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
69 words
A fluoroelastomer composition comprising (A) an elastomeric copolymer of vinylidene fluoride and at least one other fluorine-containing monomer, and (B) as a vulcanization agent, a carboxylic acid ester of 4,4'-sulfonyldiphenol in which 25-100% of the equivalents of hydroxyl groups of said diphenol have been converted to carboxylic acid ester groups, said carboxylic acid being selected from the group: aliphatic and aromatic carboxylic acids having up to 26 carbon atoms.
Claim 2
Dependent Claim
69 words
A fluoroelastomer composition comprising (A) an elastomeric copolymer of vinylidene fluoride and at least one other fluorine-containing monomer, and (B) as a vulcanization agent, a carboxylic acid ester of 4,4'-sulfonyldiphenol in which 25-100% of the equivalents of hydroxyl groups of said diphenol have been converted to carboxylic acid ester groups, said carboxylic acid being selected from the group: aliphatic and aromatic carboxylic acids having up to 26 carbon atoms.
Claim 3
Dependent Claim
38 words
A composition according to claim 1 which also contains (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.
Claim 4
Dependent Claim
25 words
A composition according to claim 1 which also contains (D) a compound capable of functioning as a vulcanization accelerator in the presence of component B.
Claim 5
Dependent Claim
58 words
A composition according to claim 1 which contains about 0.0005-0.05 mol of component B per 100 grams of component A, and also contains at least two equivalents of component C as defined in claim 2 per equivalent of component B, and about 0.1-10 grams of component D as defined in claim 3 per 100 grams of component A.
Claim 6
Dependent Claim
50 words
A composition according to claim 4 wherein the component B content is about 0.001-0.015 mol per 100 grams of component A, the component C content is about 1-15 grams per 100 grams of component A, and the component D content is about 0.2-2.0 grams per 100 grams of component A.
Claim 7
Dependent Claim
44 words
A composition according to claim 4 wherein component A is a copolymer selected from the group: copolymers of vinylidene fluoride and hexafluoropropylene or pentafluoropropylene, copolymers of vinylidene fluoride, tetrafluoroethylene and hexafluoropropylene or pentafluoropropylene, and copolymers of vinylidene fluoride, hexafluoropropylene, and a perfluoroalkyl perfluorovinyl ether.
Claim 8
Dependent Claim
22 words
A composition according to claim 6 wherein component B is an ester of 4,4'-sulfonyldiphenol and a fatty acid containing 2-18 carbon atoms.
Claim 9
Dependent Claim
14 words
A composition according to claim 7 wherein said fatty acid contains 2-8 carbon atoms.
Claim 10
Dependent Claim
14 words
A composition according to claim 7 wherein component B is the diacetate of 4,4'-sulfonyldiphenol.
Claim 11
Dependent Claim
122 words
A composition according to claim 7 wherein component D is a compound of the formula ##EQU2## wherein P is selected from the group: phosphorous, arsenic, and antimony; R 1 , R 2 , R 3 and R 4 are selected individually from the group: C 1 -C 20 alkyl, aryl, aralkyl, alkenyl, and the chlorine, fluorine, bromine, cyano, -OR and -COOR substituted analogs thereof, R being selected from the group: C 1 -C 20 alkyl, aryl, aralkyl, and alkenyl; X is selected from the group: halide, sulfate, sulfite, carbonate, pentachlorothiophenolate, tetrafluoroborate, hexafluorosilicate, hexafluorophosphate, dimethyl phosphate and C 1 -C 20 alkyl-, aryl-, aralkyl-, and alkenyl-/-carboxylate and -dicarboxylate; and n is 1 or 2 and equal to the valence of the anion X.
Claim 12
Dependent Claim
16 words
A composition according to claim 10 wherein component D is benzyl triphenyl phosphonium bromide or -chloride.
Claim 13
Dependent Claim
125 words
A composition according to claim 3 which also contains as an additional vulcanization agent about 1-75 mol percent, based on the total mols of vulcanization agent present, of a hydroxylic aromatic compound selected from the group: mono-, di-, tri-, and tetrahydroxybenzenes, naphthalenes, and anthracenes, and bisphenols of the formula ##SPC2## wherein A is a difunctional aliphatic, cycloaliphatic, or aromatic radical of 1-13 carbon atoms, or a thio, oxy, carbonyl, sulfinyl, or sulfonyl radical; A is optionally substituted with at least one chlorine or fluorine atom; x is 0 or 1; n is 1 or 2; and any aromatic ring of the hydroxylic compound is optionally substituted with at least one atom of chlorine, fluorine or bromine, a -CHO group, or a carboxyl or acyl radical.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |