US3880787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Benzothiazole accelerator systems
Assignee: Goodrich Corp
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Filing: 1973-03-19
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Granted: 1975-04-29
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Expires: 1993-03-19
Abstract
Abstract Improved accelerator systems comprising a benzothiazole accelerator and an amine-blocked diisocyanate are provided for vulcanization of polymers. These accelerator systems are stable during processing, thereby minimizing scorch of the polymer, but at vulcanization temperatures provide very rapid cures.
Inventors
- 👤 Raymond C Srail
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:51
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/45; C08K5/46; C08K5/47; C08K5/16; C08K5/34
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
78 words
A COMPOSITION COMPRISING (1) A SULFUR-VALCANIZABLE RUBBER HAVING FROM ABOUT 0.5 TO 50% BY WEIGHT OF OLEFINIC UNSATURATION DERIVED FROO CONJUGATED DIOLEFINS CONTAINING FROM 4 TO 6 CARBON ATOMS, (2) SULFUR, (3) A METAL VULCANIZATION ACTIVATOR SELECTED FROM THE GROUP CONSISTING OF METAL OXIDES, HYDROXIDES, AND SALTS WHEREIN THE METAL IS SELECTED FROM THE GROUP CONSISTING OF ZINC, CADMIUM, LEAD, CALCIUM AND IRON, AND (4) AN ACCELERATOR SYSTEM CONSISTING ESSENTIALLY OF (A) A 2THIOBENZOTHIAZOLE ACCELERATOR OF THE FORMULA
Claim 2
Dependent Claim
78 words
A COMPOSITION COMPRISING (1) A SULFUR-VALCANIZABLE RUBBER HAVING FROM ABOUT 0.5 TO 50% BY WEIGHT OF OLEFINIC UNSATURATION DERIVED FROO CONJUGATED DIOLEFINS CONTAINING FROM 4 TO 6 CARBON ATOMS, (2) SULFUR, (3) A METAL VULCANIZATION ACTIVATOR SELECTED FROM THE GROUP CONSISTING OF METAL OXIDES, HYDROXIDES, AND SALTS WHEREIN THE METAL IS SELECTED FROM THE GROUP CONSISTING OF ZINC, CADMIUM, LEAD, CALCIUM AND IRON, AND (4) AN ACCELERATOR SYSTEM CONSISTING ESSENTIALLY OF (A) A 2THIOBENZOTHIAZOLE ACCELERATOR OF THE FORMULA
Claim 3
Dependent Claim
54 words
A composition of claim 1 wherein the total weight of 2-thiobenzothiazole accelerator and the amine-blocked diisocyanate is present at a level from about 0.5 to 8 parts by weight per 100 parts by weight of the rubber, and the weight ratio of the amine-blocked diisocyanate to 2-thiobenzothiazole accelerator is from about 0.2:1 to 4:1.
Claim 4
Dependent Claim
53 words
A composition of claim 2 wherein the amine-blocked diisocyanate is derived from (i) a heterocyclic amine selected from the group consisting of pyrrolidine, piperidine, 2-pipecoline, 3-pipecoline, and 4-pipecoline and (ii) a diisocyanate selected from the group consisting of diphenylmethane-p,p''-diisocyanate, di(3-methylphenyl)methane-p, p''-diisocyanate, diphenylisopropylidene-p,p''-diisocyanate, di(3-methylphenyl)-p,p''-diisocyanate, di(3-methoxyphenyl)p,p''-diisocyanate, p-phenylene diisothiocyanate, p-toluene diisothiocyanate, p-3-fluorophenyl diisothiocyanate, naphthalene-1,5-diisothiocyanate, and naphthalene-1,8-diisothiocyanate.
Claim 5
Dependent Claim
33 words
A composition of claim 3 wherein the metal vulcanization activator is a zinc salt of a fatty acid, and the 2-thiobenzothiazole is selected from the group consisting of 2-mercaptobenzothiazole, zinc-2-mercaptobenzothiazole and di-2-benzothiazole disulfide.
Claim 6
Dependent Claim
14 words
A composition of claim 4 where the amine-blocked diisocyanate is of pyrrolidine and diphenylmethane-p,p''-diisocyanate.
Claim 7
Dependent Claim
14 words
A composition of claim 4 where the amine-blocked diisocyanate is of piperidine and diphenylmethane-p,p''-diisocyanate.
Claim 8
Dependent Claim
14 words
A composition of claim 4 where the amine-blocked diisocyanate is of pyrrolidine and p-phenylene-diisothiocyanate.
References Cited (Backward Citations)
US1904573A
Cited
US3135716A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |