US4162354A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Promoters for radiation induced cross-linking in polymer substances
Assignee: Bridgestone Firestone Inc
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Filing: 1978-02-21
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Granted: 1979-07-24
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Expires: 1998-02-21
Abstract
Abstract Process for the production of vulcanizates of diolefin rubbers by irradiation of compositions containing such rubbers utilizing polyhydrosulfides such as 1,10-dimercaptodecane as direct promoters. Indirect promoters may also be used to lower the total dose requirements.
Inventors
- 👤 Dale S. Pearson
- 👤 Anton Shurpik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:43
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/02; C08K5/03; B; B29; B29C; B29C71/00; B29C71/04; C08K5/36; C08K5/37; B29C35/00; B29C35/02; B29C35/08; B29C35/0866; B29C2035/0877; B29K; B29K2021/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
98 words
Vulcanizable compositions suitable for the formation of vulcanizates of diolefin rubbers by exposure to high energy ionizing radiation at a total dose of from about 0.1 to 15 Mrads, said compositions comprising diolefin rubbers having an average molecular weight of from about 100,000 to about 500,000 together with from about 0.1 to 5% based on the total weight of at least one polyhydrosulfide direct radiation vulcanization promoter together with from about 0.1 to 5% of an indirect radiation vulcanization promoter which is a low molecular weight halogenated aliphatic or aromatic hydrocarbon containing up to about 10 carbon atoms.
Claim 2
Dependent Claim
98 words
Vulcanizable compositions suitable for the formation of vulcanizates of diolefin rubbers by exposure to high energy ionizing radiation at a total dose of from about 0.1 to 15 Mrads, said compositions comprising diolefin rubbers having an average molecular weight of from about 100,000 to about 500,000 together with from about 0.1 to 5% based on the total weight of at least one polyhydrosulfide direct radiation vulcanization promoter together with from about 0.1 to 5% of an indirect radiation vulcanization promoter which is a low molecular weight halogenated aliphatic or aromatic hydrocarbon containing up to about 10 carbon atoms.
Claim 3
Dependent Claim
46 words
A composition as in claim 1 wherein the halogenated hydrocarbon indirect radiation promoter is selected from the group consisting of dichlorobenzenes, dibromobenzenes, difluorobenzenes, bromobenzene, chlorobenzene, chlorotoluenes, mono- and polychlorinated biphenyls, dichloromethacrylates, chloroform, carbon tetrachloride, carbon tetrabromide, hexachloroethane, 1,2-dichloro-4-t-butylbenzene, t-butyl chloride, cyclohexyl bromide, a-chlorotoluene, and a, a'-dichloroxylene.
Claim 4
Dependent Claim
23 words
A composition as in claim 1 wherein at least one direct promoter is 1,10-dimercaptodecane and at least one indirect promoter is a dichlorobenzene.
Claim 5
Dependent Claim
20 words
A composition as in claim 1 wherein the direct promoter is trimethylolpropane dithioglycolate and the indirect promoter is chlorinated biphenyl.
Claim 6
Dependent Claim
16 words
A composition as in claim 1 wherein the concentration of polyhydrosulfide is from 0.25 to 1.5%.
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) | 1982-07-23 | 1983-01-22 | 1983-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-23 | 1987-01-22 | 1987-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-23 | 1991-01-22 | 1991-07-24 | $7700.00 | Window Closed / Lapsed |