US4525539A
Expired / Lapsed
US
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Vulcanizable nitrile-containing perfluoroelastomer
Assignee: EIDP Inc
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Filing: 1982-12-02
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Granted: 1985-06-25
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Expires: 2002-12-02
Abstract
Abstract Vulcanizable nitrile-containing perfluoroelastomer polymers can be cured by reaction with certain bis(aminophenols) or tetraamines.
Inventors
- 👤 Andrew E. Feiring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:27
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/17; C08K5/18; C08G; C08G65/00; C08G65/002; C08G65/005; C08G65/007; C08K5/36; C08K5/41
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
106 words
A vulcanizable perfluoroelastomer composition comprising (a) a copolymer consisting essentially of copolymerized units of: (1) 53-79.8 mole percent tetrafluoroethylene, (2) 20-45 mole percent perfluoromethyl perfluorovinyl ether and (3) 0.2-2 mole percent of a cure site monomer of the formula: ##STR6## where n=1-4 and x=1-2, and (b) 0.5-5.0 parts by weight per 100 parts by weight of the copolymer of a vulcanizing agent selected from the group consisting of bisaminophenols of the formula ##STR7## and tetraamines of the formula ##STR8## where A is SO 2 , O, CO, alkyl of 1-6 carbon atoms, perfluoroalkyl of 1-10 carbon atoms, or a carbon-carbon bond linking the two aromatic rings.
Claim 2
Dependent Claim
106 words
A vulcanizable perfluoroelastomer composition comprising (a) a copolymer consisting essentially of copolymerized units of: (1) 53-79.8 mole percent tetrafluoroethylene, (2) 20-45 mole percent perfluoromethyl perfluorovinyl ether and (3) 0.2-2 mole percent of a cure site monomer of the formula: ##STR6## where n=1-4 and x=1-2, and (b) 0.5-5.0 parts by weight per 100 parts by weight of the copolymer of a vulcanizing agent selected from the group consisting of bisaminophenols of the formula ##STR7## and tetraamines of the formula ##STR8## where A is SO 2 , O, CO, alkyl of 1-6 carbon atoms, perfluoroalkyl of 1-10 carbon atoms, or a carbon-carbon bond linking the two aromatic rings.
Claim 3
Dependent Claim
41 words
The composition of claim 1 wherein the copolymer (a) consisting essentially of copolymerized units of: (1) 64.4-72.6 mole percent tetrafluoroethylene, (2) 27-35 mole percent perfluoromethyl perfluorovinyl ether, and (3) 0.4-1.0 mole percent of a compound of the formula: ##STR9## where n=2-3.
Claim 4
Dependent Claim
15 words
The composition of claim 2 wherein the component monomer (3) in copolymer (a) comprises perfluoro-(8-cyano-5-methyl-3,6-dioxa-1-octene).
Claim 5
Dependent Claim
40 words
The composition of claim 3 wherein component monomer (1) of copolymer (a) comprises about 69.3 mole percent, component monomer (2) of copolymer (a) comprises about 30 mole percent, and component monomer (3) of copolymer (a) comprises about 0.7 mole percent.
Claim 6
Dependent Claim
35 words
The composition of claim 1 wherein the moiety A in the bisaminophenol and tetraamine vulcanizing agent (b) is SO 2 , perfluoroalkyl of 1-10 carbon atoms, or a carbon-carbon bond linking the two aromatic rings.
Claim 7
Dependent Claim
26 words
The composition of claim 5 wherein the vulcanizing agent (b) is selected from the group consisting of: (1) 4,4'-[2,2,2,-trifluoro-1-(trifluoromethyl)-ethylidene]bis(2-aminophenol), (2) 4,4'-sulfonylbis(2-aminophenol), (3) 3,3'-diaminobenzidene, and (4) 3,3',4,4'-tetraaminobenzophenone.
Claim 8
Dependent Claim
12 words
The composition of claim 6 wherein the vulcanizing agent (b) is 4,4'-[2,2,2,-trifluoro-(trifluoromethyl)-ethylidene]bis(2-aminophenol).
Claim 9
Dependent Claim
26 words
The composition of claim 1 wherein the vulcanizing agent (b) is present in the amount of 1.0-2.0 parts per 100 parts by weight of the copolymer.
Claim 10
Independent Claim
123 words
A method of vulcanizing a perfluoroelastomer, wherein the perfluoroelastomer consisting essentially of copolymerized units of: (1) 53-79.8 mole percent tetrafluoroethylene, (2) 20-45 mole percent perfluoromethyl perfluorovinyl ether and (3) 0.2-2 mole percent of a cure site monomer of the formula: ##STR10## where n=1-4 and x=1-2, and said method comprising mixing with the perfluoroelastomers 0.5-5.0 parts by weight per 100 parts by weight of the copolymer of a vulcanizing agent selected from the group consisting of bisaminophenols of the formula ##STR11## and tetraamines of the formula ##STR12## where A is SO 2 , O, CO, alkyl of 1-6 carbon atoms, perfluoroalkyl of 1-10 carbon atoms, or a carbon-carbon bond linking the two aromatic rings and heating the mixture to 160°-210° C. for 30-60 minutes.
Claim 11
Independent Claim
123 words
A method of vulcanizing a perfluoroelastomer, wherein the perfluoroelastomer consisting essentially of copolymerized units of: (1) 53-79.8 mole percent tetrafluoroethylene, (2) 20-45 mole percent perfluoromethyl perfluorovinyl ether and (3) 0.2-2 mole percent of a cure site monomer of the formula: ##STR10## where n=1-4 and x=1-2, and said method comprising mixing with the perfluoroelastomers 0.5-5.0 parts by weight per 100 parts by weight of the copolymer of a vulcanizing agent selected from the group consisting of bisaminophenols of the formula ##STR11## and tetraamines of the formula ##STR12## where A is SO 2 , O, CO, alkyl of 1-6 carbon atoms, perfluoroalkyl of 1-10 carbon atoms, or a carbon-carbon bond linking the two aromatic rings and heating the mixture to 160°-210° C. for 30-60 minutes.
Claim 12
Dependent Claim
10 words
A vulcanized article made from the compostion of claim 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) | 1988-06-24 | 1988-12-24 | 1989-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-24 | 1992-12-24 | 1993-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-24 | 1996-12-24 | 1997-06-25 | $7700.00 | Window Closed / Lapsed |