US3791838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vulcanization accelerator for natural and synthetic rubber
Assignee: Wyeth Holdings LLC
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Filing: 1972-10-13
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Granted: 1974-02-12
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Expires: 1992-10-13
Abstract
Abstract A fast wetting, rubber vulcanization accelerator composition is provided which comprises a major amount of the zinc salt of 2mercaptobenzothiazole and minor but effective amounts of: (a) a salt of a dialkyl (C5-C20) ester of sulfosuccinic acid, and (b) guar gum or starch. Dispersions of the composition in water are stable, fluid and substantially non-thixotropic such that they are storable and can be easily pumped and blended with a rubber latex.
Inventors
- 👤 E Kaplan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:22
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/0008; C08K5/0025
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
39 words
The composition according to claim 1 wherein the amount of (a) is from about 0.5% through 2.5% and the amount of (b) is from about 0.25% through 2.0%, each based on the weight of said zinc salt of 2-mercaptobenzothiazole.
Claim 2
Dependent Claim
15 words
The composition according to claim 1 wherein (a) is the sodium salt of dioctylsulfosuccinic acid.
Claim 3
Dependent Claim
12 words
The composition according to claim 1 wherein (a) is sodium diamyl sulfosuccinate.
Claim 4
Dependent Claim
11 words
The composition according to claim 1 wherein (b) is guar gum.
Claim 5
Dependent Claim
11 words
The composition according to claim 1 wherein (b) is potato starch.
Claim 6
Dependent Claim
20 words
The composition according to claim 1 wherein (a) is the sodium salt of dioctylsulfosuccinic acid and (b) is potato starch.
Claim 7
Dependent Claim
20 words
The composition according to claim 1 wherein (a) is the sodium salt of dioctylsulfosuccinic acid and (b) is guar gum.
Claim 8
Dependent Claim
71 words
A process for preparing a readily dispersible vulcanization accelerator composition of a zinc salt of 2-mercaptobenzothiazole which comprises intimately admixing with such salt (a) a salt of a dialkyl ester, of 5 to 20 carbon atom, of sulfosuccinic acid and (b) guar gum or starch, the components (a) and (b) being present in amounts sufficient to render the composition fast-wetting, stable, fluid and substantially non-thixotropic when added to an aqueous medium.
Claim 9
Dependent Claim
39 words
The process according to claim 9 wherein the amount of (a) is from about 0.5% through 2.5% and the amount of (b) is from about 0.25% through 2.0%, each based on the weight of said zinc salt of 2-mercaptobenzothiazole.
Claim 10
Dependent Claim
20 words
The process according to claim 9 wherein (a) is the sodium salt of dioctylsulfosuccinic acid and (b) is potato starch.
Claim 11
Dependent Claim
20 words
The process according to claim 9 wherein (a) is the sodium salt of dioctylsulfosuccinic acid and (b) is guar gum.
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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |