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US3852251A
Expired / Lapsed
US
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Two-component accelerator system for vulcanizable rubbers
Assignee: Goodyear Tire and Rubber Co
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Filing: 1972-04-18
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Granted: 1974-12-03
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Expires: 1992-04-18
Abstract
Abstract Two-component accelerator system for the sulfur vulcanization of rubber, one accelerator being 2-(morpholinodithio)-benzothiazole and a second accelerator being a compound such as benzothiazyl disulfide.
Inventors
- 👤 F Maxey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:14
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/45; C08K5/46; C08K5/47
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
53 words
A SULFUR VULCANIZABLE RUBBER CONTAINING 0.10 TO 3.25 PARTS BY WEIGHT OF FREE SULFUR PER 100 PARTS BY WEIGHT OF RUBBER AND 0.5 TO 3.25 PARTS BY WEIGHT PER 1100 PARTS BY WEIGHT OF RUBBER, OF AN ACCELERATOR SYSTEM COMPRISING A.2-(MORPHOLINODITHIO)-BENZOTHIAZOLE, AND B. AT LEAST ONE BENZOTHIAZOLE ACCELERATOR HAVING THE FOLLOWING STRUCTURAL FROMULA
Claim 2
Dependent Claim
53 words
A SULFUR VULCANIZABLE RUBBER CONTAINING 0.10 TO 3.25 PARTS BY WEIGHT OF FREE SULFUR PER 100 PARTS BY WEIGHT OF RUBBER AND 0.5 TO 3.25 PARTS BY WEIGHT PER 1100 PARTS BY WEIGHT OF RUBBER, OF AN ACCELERATOR SYSTEM COMPRISING A.2-(MORPHOLINODITHIO)-BENZOTHIAZOLE, AND B. AT LEAST ONE BENZOTHIAZOLE ACCELERATOR HAVING THE FOLLOWING STRUCTURAL FROMULA
Claim 3
Dependent Claim
13 words
The sulfur vulcanizable rubber according to claim 1 containing as an accelerator N-(cyclohexyl)-2-benzothiazylsulfenamide.
Claim 4
Dependent Claim
96 words
A sulfur vulcanizable rubber containing 0.10 to 3.25 parts by weight of free sulfur per 100 parts by weight of rubber and 0.5 to 3.25 parts by weight per 100 parts by weight of rubber, of an accelerator system comprising A. 2-(morpholinodithio)-benzothiazole, and B. at least one benzothiazole accelerator selected from the group consisting of N-(cyclohexyl)-2-benzothiazolesulfenamide, N-(t-butyl)-2-benzothiazolesulfenamide, N,N-(diisopropyl)-2-benzothiazolesulfenamide, N,N-(diethyl)-2-benzothiazolesulfenamide, N-(octyl)-2-benzothiazolesulfenamide, and 2-(3-methylpiperidinothio)-benzothiazole, wherein the weight ratio A/B is 2/3 to 4/1, and wherein the total weight of sulfur plus accelerator system is from 2.25 to 5.50 parts by weight per 100 parts by weight of rubber.
Claim 5
Dependent Claim
96 words
A sulfur vulcanizable rubber containing 0.10 to 3.25 parts by weight of free sulfur per 100 parts by weight of rubber and 0.5 to 3.25 parts by weight per 100 parts by weight of rubber, of an accelerator system comprising A. 2-(morpholinodithio)-benzothiazole, and B. at least one benzothiazole accelerator selected from the group consisting of N-(cyclohexyl)-2-benzothiazolesulfenamide, N-(t-butyl)-2-benzothiazolesulfenamide, N,N-(diisopropyl)-2-benzothiazolesulfenamide, N,N-(diethyl)-2-benzothiazolesulfenamide, N-(octyl)-2-benzothiazolesulfenamide, and 2-(3-methylpiperidinothio)-benzothiazole, wherein the weight ratio A/B is 2/3 to 4/1, and wherein the total weight of sulfur plus accelerator system is from 2.25 to 5.50 parts by weight per 100 parts by weight of rubber.
Claim 6
Dependent Claim
12 words
The sulfur vulcanizable rubber according to claim 3 wherein R3 is hydrogen.
Claim 7
Dependent Claim
18 words
The sulfur vulcanizable rubber according to claim 3 wherein the sulfur level is from 0.10 to 1.25 parts.
Claim 8
Dependent Claim
18 words
The sulfur vulcanizable rubber according to claim 3 wherein the sulfur level is from 1.25 to 3.25 parts.
Claim 9
Dependent Claim
20 words
A process of preparing a rubbery vulcanizate comprising heating the sulfur vulcanizable rubber of claim 1 at a vulcanizing temperature.
References Cited (Backward Citations)
US2199105A
Cited
US3557028A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |