US5260351A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiation curing of perfluoroelastomers
Assignee: EIDP Inc
•
Filing: 1993-03-17
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Granted: 1993-11-09
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Expires: 2013-03-17
Abstract
Abstract Perfluoroelastomers cured by radiation and characterized by an absence of curing agent residues in the cured product.
Inventors
- 👤 Anestis L. Logothetis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:37
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/28; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
110 words
A process for curing a perfluoropolymer derived from tetrafluoroethylene, a perfluoroalkyl perfluorovinyl ether wherein the alkyl group contains 1 to 5 carbon atoms, and up to about 2 mole percent of cure site monomer units derived from ethylenically unsaturated compounds, the units being selected from those having at least one of nitrile, perfluorophenyl, bromo- and iodo-substituents, the units being present in an amount sufficient to provide at least about 0.1 mole percent of at least one of perfluorophenyl, nitrile, bromine, and iodine in the resulting terpolymer, which process comprises exposing the perfluoropolymer to about from 2 to 20 megarads of electron beam radiation, in the substantial absence of curing agent.
Claim 2
Dependent Claim
110 words
A process for curing a perfluoropolymer derived from tetrafluoroethylene, a perfluoroalkyl perfluorovinyl ether wherein the alkyl group contains 1 to 5 carbon atoms, and up to about 2 mole percent of cure site monomer units derived from ethylenically unsaturated compounds, the units being selected from those having at least one of nitrile, perfluorophenyl, bromo- and iodo-substituents, the units being present in an amount sufficient to provide at least about 0.1 mole percent of at least one of perfluorophenyl, nitrile, bromine, and iodine in the resulting terpolymer, which process comprises exposing the perfluoropolymer to about from 2 to 20 megarads of electron beam radiation, in the substantial absence of curing agent.
Claim 3
Dependent Claim
19 words
A process of claim 1 wherein the perfluoropolymer is exposed to about from 6 to 16 megarads of radiation.
Claim 4
Dependent Claim
57 words
A process of claim 1 wherein the cure site monomer units are derived from ethylenically unsaturated compounds having (i) nitrile or perfluorophenyl and (ii) bromo- or iodo- substituents, the units being present in an amount sufficient to provide at least about 0.1 mole percent each of perfluorophenyl or nitrile and bromine or iodine in the resulting terpolymer.
Claim 5
Dependent Claim
18 words
A process of claim 1 wherein the terpolymer is prepared from tetrafluoroethylene, a perfluoroalkyl perfluorovinyl ether and 4-bromo-3,3,4,4-tetrafluorobutene-1.
Claim 6
Dependent Claim
18 words
A process of claim 1 wherein the terpolymer is prepared from tetrafluoroethylene, a perfluoroalkyl perfluorovinyl ether and perfluoro-(8-cyano-5-methyl-3,6-dioxa-1-octene).
Claim 7
Dependent Claim
14 words
A process of claim 1 wherein the radiation is applied in a single dose.
Claim 8
Dependent Claim
15 words
A process of claim 1 wherein the radiation is applied in two or more dosages.
Claim 9
Dependent Claim
18 words
Cured perfluoroelastomer resulting from the process of claim 1, the perfluoroelastomer being substantially free from curing agent residue.
Claim 10
Dependent Claim
16 words
A cured perfluoroelastomer of claim 8, consisting essentially of tetrafluoroethylene, a perfluoroalkyl perfluorovinyl ether and 4-bromo-3,3,4,4-tetrafluorobutene-1.
Claim 11
Dependent Claim
16 words
A cured perfluoroelastomer of claim 8, consisting essentially of tetrafluoroethylene, a perfluoroalkyl perfluorovinyl ether and perfluoro-(8-cyano-5-methyl-3,6-dioxa-1-octene).
Claim 12
Dependent Claim
17 words
A cured perfluoroelastomer of claim 8 having less than 500 parts per million of curing agent residue.
Claim 13
Dependent Claim
17 words
A cured perfluoroelastomer of claim 11 having less than 100 parts per million of curing agent residue.
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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) | 1996-11-08 | 1997-05-10 | 1997-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-08 | 2001-05-10 | 2001-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-08 | 2005-05-10 | 2005-11-09 | $7700.00 | Window Closed / Lapsed |