Patent US5447993A successfully refreshed from Google Patents.
US5447993A
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US
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Perfluoroelastomer curing
Assignee: EIDP Inc
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Filing: 1994-04-19
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Granted: 1995-09-05
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Expires: 2014-04-19
Abstract
Abstract Nitrile containing perfluoroelastomers are cured by a combination of a peroxide, a coagent, and a catalyst which causes crosslinks to form using the nitrile groups. The method is relatively fast and economical, and gives vulcanizates which have excellent high temperature properties. Triphenyltin hydroxide is an exceptionally good catalyst for the formation of crosslinks from nitrile groups in perfluoroelastomers.
Inventors
- 👤 Anestis L. Logothetis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:47
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/14; C08J; C08J3/00; C08J3/24; C08K5/56; C08K5/57
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
109 words
A process for the curing of a perfluoroelastomer, comprising, (a) confining to a specific shape a mixture, comprising: (i) a perfluoroelastomer containing a plurality of nitrile groups; (ii) a tin catalyst capable of catalyzing the crosslinking of said perfluoroelastomer through said nitrile groups; and (iii) a peroxide capable of crosslinking said perfluoroelastomer and a coagent which is a diene or triene; while heating said mixture at a first temperature sufficient to decompose said peroxide; (b) removing said mixture from confinement; and (c) heating said mixture at a second temperature, which is higher than said first temperature, for a period of time sufficient to form crosslinks from said nitrile groups.
Claim 2
Dependent Claim
109 words
A process for the curing of a perfluoroelastomer, comprising, (a) confining to a specific shape a mixture, comprising: (i) a perfluoroelastomer containing a plurality of nitrile groups; (ii) a tin catalyst capable of catalyzing the crosslinking of said perfluoroelastomer through said nitrile groups; and (iii) a peroxide capable of crosslinking said perfluoroelastomer and a coagent which is a diene or triene; while heating said mixture at a first temperature sufficient to decompose said peroxide; (b) removing said mixture from confinement; and (c) heating said mixture at a second temperature, which is higher than said first temperature, for a period of time sufficient to form crosslinks from said nitrile groups.
Claim 3
Dependent Claim
26 words
The process as recited in claim 1 wherein said perfluoroelastomer is a copolymer of a perfluoro(alkyl vinyl ether), tetrafluoroethylene, and a nitrile containing cure site monomer.
Claim 4
Dependent Claim
31 words
The process as recited in claim 1 wherein said perfluoroelastomer is a copolymer of 53-79.9 mole percent tetrafluoroethylene, 20-46.9 mole percent perfluoro(methyl vinyl ether), and 0.1 to 2.5 mole percent perfluoro(8-cyano-5-methyl-3,6-dioxa-1-octene).
Claim 5
Dependent Claim
30 words
The process as recited in claim 1 wherein said first temperature is about 150° C. to about 220° C., said second temperature is about 250° C. to about 320° C.
Claim 6
Dependent Claim
75 words
The process as recited in claim 4 wherein about 0.3 to about 5 parts by weight of said peroxide per hundred parts of said perfluoroelastomer are present, about 0.3 to about 5 parts by weight of triallyl isocyanurate or triallyl cyanurate per hundred parts of said perfluoroelastomer are present, and about 0.3 to about 5 parts by weight of said catalyst per hundred parts of said perfluoroelastomer are present, said catalyst being an organotin compound.
Claim 7
Dependent Claim
30 words
The process as recited in claim 3 wherein said first temperature is about 150° C. to about 220° C., said second temperature is about 250° C. to about 320° C.
Claim 8
Dependent Claim
75 words
The process as recited in claim 6 wherein about 0.3 to about 5 parts by weight of said peroxide per hundred parts of said perfluoroelastomer are present, about 0.3 to about 5 parts by weight of triallyl isocyanurate or triallyl cyanurate per hundred parts of said perfluoroelastomer are present, and about 0.3 to about 5 parts by weight of said catalyst per hundred parts of said perfluoroelastomer are present, said catalyst being an organotin compound.
Claim 9
Dependent Claim
15 words
The process as recited in claim 5 wherein said catalyst is tetraphenyltin or triphenyltin hydroxide.
Claim 10
Dependent Claim
15 words
The process as recited in claim 7 wherein said catalyst is tetraphenyltin or triphenyltin hydroxide.
Claim 11
Dependent Claim
87 words
A composition comprising: a perfluoroelastomer containing a plurality of nitrile groups; about 0.1 to about 10 parts by weight per hundred parts of said perfluoroelastomer of a tin catalyst capable of catalyzing the crosslinking of said perfluoroelastomer through said nitrile groups; about 0.1 to about 10 parts by weight per hundred parts of said perfluoroelastomer of a peroxide capable of curing said perfluoroelastomer; and about 0.1 to about 10 parts by weight per hundred parts of said perfluoroelastomer of a coagent which is a diene or triene.
Claim 12
Dependent Claim
87 words
A composition comprising: a perfluoroelastomer containing a plurality of nitrile groups; about 0.1 to about 10 parts by weight per hundred parts of said perfluoroelastomer of a tin catalyst capable of catalyzing the crosslinking of said perfluoroelastomer through said nitrile groups; about 0.1 to about 10 parts by weight per hundred parts of said perfluoroelastomer of a peroxide capable of curing said perfluoroelastomer; and about 0.1 to about 10 parts by weight per hundred parts of said perfluoroelastomer of a coagent which is a diene or triene.
Claim 13
Dependent Claim
26 words
The composition as recited in claim 10 wherein said perfluoroelastomer is a copolymer of a perfluoro(alkyl vinyl ether), tetrafluoroethylene, and a nitrile containing cure site monomer.
Claim 14
Dependent Claim
31 words
The composition as recited in claim 10 wherein said perfluoroelastomer is a copolymer of 53-79.9 mole percent tetrafluoroethylene, 20-46.9 mole percent perfluoro(methyl vinyl ether), and 0.1 to 2.5 mole percent perfluoro(8-cyano-5-methyl-3,6-dioxa-1-octene).
Claim 15
Dependent Claim
74 words
The composition as recited in claim 10 about 0.3 to about 5 parts by weight of said peroxide per 100 parts of perfluoroelastomer are present, wherein about 0.3 to about 5 parts by weight of triallyl isocyanurate or triallyl cyanurate per hundred parts of said perfluoroelastomer are present, and about 0.3 to about 5 parts by weight of said catalyst per hundred parts of said perfluoroelastomer are present, said catalyst being an organotin compound.
Claim 16
Dependent Claim
75 words
The composition as recited in claim 12 wherein about 0.3 to about 5 parts by weight of said peroxide per 100 parts of said perfluoroelastomer are present, about 0.3 to about 5 parts by weight of triallyl isocyanurate or triallyl cyanurate per hundred part of said perfluoroelastomer are present and about 0.3 to about 5 parts by weight of said catalyst per hundred parts of said perfluoroelastomer are present, said catalyst being an organotin compound.
Claim 17
Dependent Claim
15 words
The composition as recited in claim 14 wherein said catalyst is tetraphenyltin or triphenyltin hydroxide.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1998-09-04 | 1999-03-06 | 1999-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-09-04 | 2003-03-06 | 2003-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-09-04 | 2007-03-06 | 2007-09-05 | $7700.00 | Window Closed / Lapsed |