Patent US4144154A successfully refreshed from Google Patents.
US4144154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polythiol accelerated radiation crosslinking of olefinically unsaturated polymers
Assignee: Individual
•
Filing: 1978-06-08
•
Granted: 1979-03-13
•
Expires: 1998-06-08
Abstract
Abstract Improved radiation vulcanization of elastomers is accomplished by incorporating into the elastomer composition a polythiol, bivalent metal oxide and an aliphatic acid. The polythiol is preferably a hydrocarbon thioether thiol and is normally liquid at room temperature with a molecular weight of at least 150, said metal oxide is preferably zinc oxide and said acid is preferably stearic acid; alternatively, the reaction product of said metal oxide and acid can be used e.g., zinc stearate at appropriately increased concentration.
Inventors
- 👤 Robert L. Zapp
- 👤 Alexis A. Oswald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:44
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/37; C08K5/372; B; B29; B29C; B29C71/00; B29C71/04; C08G; C08G75/00; C08G75/02; C08G75/04; C08G75/045; C08G75/14; C08K5/04; C08K5/09; B29C35/00; B29C35/02; B29C35/08; B29C35/0866; B29K; B29K2021/00
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
123 words
In a process for the curing of a polymer having a number average of at least 50,000, using ionizing radiation, wherein said polymer is an olefinically unsaturated polymer having at least 15 mole % unsaturation the improvement which comprises incorporating into the polymer, (a) about 0.5 to 6 parts per hundred 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, (b) about 1.0 to 10.0 parts per hundred by weight of polymer of a bivalent metal oxide, and (c) about 0.5 to 5 parts per hundred by weight of polymer of an aliphatic acid with about 12 to 18 carbon atoms.
Claim 2
Dependent Claim
123 words
In a process for the curing of a polymer having a number average of at least 50,000, using ionizing radiation, wherein said polymer is an olefinically unsaturated polymer having at least 15 mole % unsaturation the improvement which comprises incorporating into the polymer, (a) about 0.5 to 6 parts per hundred 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, (b) about 1.0 to 10.0 parts per hundred by weight of polymer of a bivalent metal oxide, and (c) about 0.5 to 5 parts per hundred by weight of polymer of an aliphatic acid with about 12 to 18 carbon atoms.
Claim 3
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 4
Dependent Claim
13 words
The process of claim 1 wherein the polythiol is a hydrocarbon thioether polythiol.
Claim 5
Dependent Claim
11 words
The process of claim 1 wherein the polymer is an elastomer.
Claim 6
Dependent Claim
14 words
The process of claim 2 wherein the elastomer is styrene-butadiene rubber or polybutadiene rubber.
Claim 7
Dependent Claim
19 words
The process of claim 1 wherein the cure enhancer has a molecular weight of about 250 to about 400.
Claim 8
Dependent Claim
25 words
The process of claim 3 wherein the cure enhancer is the reaction product of a C 9 to C 20 triene and H 2 S.
Claim 9
Dependent Claim
30 words
The process of claim 3 wherein the cure enhancer is the reaction product of a C 9 to C 20 triene and a C 2 to C 14 alkylene dithiol.
Claim 10
Dependent Claim
20 words
The process of claim 1 wherein the cure enhancer is the reaction product of trivinyl cyclohexane and H 2 S.
Claim 11
Dependent Claim
14 words
The process of claim 1 wherein the cure enhancer is liquid at ambient temperature.
Claim 12
Dependent Claim
28 words
The process of claim 1 wherein the bivalent metal oxide is selected from the group consisting of zinc oxide, cadmium oxide, PbO and Pb 3 O 4 .
Claim 13
Dependent Claim
33 words
The process of claim 1 wherein the aliphatic acid with about 12 to 18 carbon atoms is selected from the group consisting of stearic acid, oleic acid, lauric acid, palmitic acid, linoleic acid.
Claim 14
Dependent Claim
31 words
The process of claim 1 wherein the aliphatic acid with about 12 to 18 carbon atoms is selected from the group consisting of coconut, corn, cottonseed, soybean and linseed fatty acids.
Claim 15
Dependent Claim
28 words
The process of claim 1 wherein the bivalent metal oxide is zinc oxide and the saturated aliphatic acid with about 12 to 18 carbon atoms is stearic acid.
Claim 16
Dependent Claim
125 words
In a process for the curing of a polymer having a number average of at least 50,000, using ionizing radiation, wherein said polymer is an olefinically unsaturated polymer having at least 15 mole % unsaturation the improvement which comprises incorporating into the polymer, (a) about 0.5 to 6 parts per hundred 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, and (b) about 4.0 to about 40.0 parts per hundred by weight of polymer of a metal salt of an aliphatic acid with about 12 to 18 carbon atoms wherein said metal is selected from the group consisting of zinc, lead, and cadmium.
Claim 17
Dependent Claim
125 words
In a process for the curing of a polymer having a number average of at least 50,000, using ionizing radiation, wherein said polymer is an olefinically unsaturated polymer having at least 15 mole % unsaturation the improvement which comprises incorporating into the polymer, (a) about 0.5 to 6 parts per hundred 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, and (b) about 4.0 to about 40.0 parts per hundred by weight of polymer of a metal salt of an aliphatic acid with about 12 to 18 carbon atoms wherein said metal is selected from the group consisting of zinc, lead, and cadmium.
Claim 18
Dependent Claim
12 words
The process of claim 15 wherein said metal salt is lead oleate.
Claim 19
Dependent Claim
12 words
The process of claim 15 wherein said metal salt is zinc stearate.
Claim 20
Dependent Claim
11 words
The process of claim 15 wherein the polymer is an elastomer.
Claim 21
Dependent Claim
15 words
The process of claim 15 wherein the elastomer is styrene butadiene rubber or polybutadiene rubber.
Claim 22
Dependent Claim
20 words
The process of claim 15 wherein the cure enhancer has from about 3 to about 5 thiol groups per molecule.
Claim 23
Dependent Claim
13 words
The process of claim 15 wherein the polythiol is a hydrocarbon thioether polythiol.
Claim 24
Dependent Claim
19 words
The process of claim 15 wherein the cure enhancer has a molecular weight of about 250 to about 400.
Claim 25
Dependent Claim
25 words
The process of claim 21 wherein the cure enhancer is the reaction product of a C 9 to C 20 triene and H 2 S.
Claim 26
Dependent Claim
30 words
The process of claim 21 wherein the cure enhancer is the reaction product of a C 9 to C 20 triene and a C 2 to C 14 alkylene dithiol.
Claim 27
Dependent Claim
20 words
The process of claim 15 wherein the cure enhancer is the reaction product of trivinyl cyclohexane and H 2 S.
Claim 28
Dependent Claim
14 words
The process of claim 15 wherein the cure enhancer is liquid at ambient temperature.
Claim 29
Dependent Claim
28 words
The process of claim 15 wherein the metal salt is present in an amount of from about 8.0 to about 24.0 parts per hundred by weight of polymer.
Claim 30
Dependent Claim
9 words
The composition prepared by the process of claim 1.
Claim 31
Dependent Claim
9 words
The composition prepared by the process of claim 4.
Claim 32
Dependent Claim
10 words
The sulfur vulcanized composition of the product of claim 29.
Claim 33
Dependent Claim
9 words
The composition prepared by the process of claim 15.
Claim 34
Dependent Claim
9 words
The composition prepared by the process of claim 18.
References Cited (Backward Citations)
US3338810A
Cited
US3662023A
Cited
US3700574A
Cited
US3725229A
Cited
US3625925A
Cited
US3843502A
Cited
US3864229A
Cited
US4094757A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-12 | 1982-09-11 | 1983-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-12 | 1986-09-11 | 1987-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-12 | 1990-09-11 | 1991-03-13 | $7700.00 | Window Closed / Lapsed |