US4094757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polythiol accelerated radiation crosslinking of olefinically unsaturated allylically halogenated polymers
Assignee: Individual
•
Filing: 1977-02-22
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Granted: 1978-06-13
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Expires: 1997-02-22
Abstract
Abstract Improved radiation vulcanization of elastomers is accomplished by incorporating into the elastomer composition a polythiol. The polythiol is preferably a hydrocarbon thioether thiol and is normally liquid at room temperature with a molecular weight of at least 150. Though difunctional polythiols are operative in this invention, the preferred polythiols have about three to about five thiol groups per molecule.
Inventors
- 👤 Robert L. Zapp
- 👤 Alexis A. Oswald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:06
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/37; B; B29; B29C; B29C71/00; B29C71/04; C08G; C08G75/00; C08G75/02; C08G75/04; C08G75/045; B29C35/00; B29C35/02; B29C35/08; B29C35/0866; B29K; B29K2021/00
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
85 words
In a process for the curing of a polymer having a number average molecular weight of at least 50,000, using ionizing radiation, wherein said polymer has at least 0.5 mole % chlorine or bromine in an allylic position, the improvement which comprises incorporating into the polymer about 0.5 to 6 parts per hundred parts by weight of polymer of a cure enhancer comprising a hydrocarbon polythiol having a number average molecular weight of about 150 to about 3,000 and having at least three thiol groups.
Claim 2
Dependent Claim
85 words
In a process for the curing of a polymer having a number average molecular weight of at least 50,000, using ionizing radiation, wherein said polymer has at least 0.5 mole % chlorine or bromine in an allylic position, the improvement which comprises incorporating into the polymer about 0.5 to 6 parts per hundred parts by weight of polymer of a cure enhancer comprising a hydrocarbon polythiol having a number average molecular weight of about 150 to about 3,000 and having at least three thiol groups.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein the polymer is an elastomer.
Claim 4
Dependent Claim
19 words
The process of claim 1 wherein the polymer is selected from the group consisting of Chlorobutyl, Bromobutyl and polychloroprene.
Claim 5
Dependent Claim
20 words
The process of claim 1 wherein the cure enhancer has from about 3 to about 5 thiol groups per molecule.
Claim 6
Dependent Claim
19 words
The process of claim 4 wherein the cure enhancer has a molecular weight of about 250 to about 400.
Claim 7
Dependent Claim
13 words
The process of claim 4 wherein the polythiol is a hydrocarbon thioether polythiol.
Claim 8
Dependent Claim
23 words
The process of claim 6 wherein the polythiol is the reaction product of a C 9 -C 20 triene and H 2 S.
Claim 9
Dependent Claim
27 words
The process of claim 6 wherein the polythiol is the reaction product of a C 9 -C 20 triene and a C 2 -C 14 alkylene dithiol.
Claim 10
Dependent Claim
19 words
The process of claim 4 wherein the polythiol is a product of trivinyl cyclohexane and excess H 2 S.
Claim 11
Dependent Claim
18 words
The process of claim 1 wherein the number average molecular weight of the polymer is at least 50,000.
Claim 12
Dependent Claim
12 words
The process of claim 1 wherein the radiation is electron beam radiation.
Claim 13
Dependent Claim
69 words
In a process for the curing of Chlorobutyl rubber using ionizing radiation, the improvement which comprises incorporating into the polymer a polythiol reaction product of trivinyl cyclohexane and H 2 S, having a molecular weight of about 150 to 3000 and having from about 3 to about 5 thiol groups per molecule, in amounts ranging from about 0.5 to about 6 parts by weight per hundred parts of polymer.
Claim 14
Dependent Claim
69 words
In a process for the curing of Chlorobutyl rubber using ionizing radiation, the improvement which comprises incorporating into the polymer a polythiol reaction product of trivinyl cyclohexane and H 2 S, having a molecular weight of about 150 to 3000 and having from about 3 to about 5 thiol groups per molecule, in amounts ranging from about 0.5 to about 6 parts by weight per hundred parts of polymer.
Claim 15
Dependent Claim
16 words
The process of claim 1 further comprising incorporating into the polymer zinc oxide and stearic acid.
Claim 16
Dependent Claim
16 words
The process of claim 12 further comprising incorporating into the polymer zinc oxide and stearic acid.
References Cited (Backward Citations)
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US3725229A
Cited
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Cited
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FR2175030B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-12 | 1981-12-12 | 1982-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-12 | 1985-12-12 | 1986-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-12 | 1989-12-12 | 1990-06-13 | $7700.00 | Window Closed / Lapsed |