US4861842A
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US
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Cure system for sulfur vulcanizable rubber
Assignee: Goodyear Tire and Rubber Co
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Filing: 1988-12-28
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Granted: 1989-08-29
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Expires: 2008-12-28
Abstract
Abstract The present invention relates to a cure system for a sulfur vulcanizable rubber. The cure system comprises: (a) from about 0.50 to about 2.0 phr of a sulfenamide accelerator selected from the group consisting of N-oxydiethylene benzothiazole-2 sulfenamide, N-cyclohexyl-2-benzothiazole sulfenamide, N-t-butyl-2-benzothiazole sulfenamide and N-oxydiethylene-thiocarbamyl-N'-oxydiethylene sulfenamide; (b) from about 0.10 to about 1.0 phr of a guanidine accelerator selected from the group consisting of diphenyl guanidine and di-ortho-tolylguanidine; (c) from about 0.10 to about 1.0 phr of a thiuram accelerator selected from the group consisting of tetraethyl thiuramdisulfide, tetramethyl thiuram monosulfide, tetramethyl thiuramdisulfide; (d) from about 0.05 to about 1.0 phr of mercapto benzothiazyl disulfide; (e) from about 0.75 to about 3.0 phr of a sulfur vulcanizing agent; (f) from about 0.05 to about 0.50 phr of N-cyclohexylthio-phthalimide; (g) from about 1.0 to about 5.0 phr of a zinc compound selected from the group consisting of zinc oxide and zinc stearate and; (h) from about 0.05 to about 1.0 phr of an activator of the formula: ##STR1## wherein R 1 , R 2 , and R 3 are independently alkyl radicals having 8 to 10 carbon atoms and M is selected from the group consisting of Cl, Br, CH 3 SO 4 and HSO 4 .
Inventors
- 👤 Martin P. Cohen
- 👤 Robert J. Brown
- 👤 Norbert Majerus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:32
CPC Classifications
C; C08; C08L; C08L21/00; C08K; C08K5/00; C08K5/16; C08K5/17; C08K5/19; C08K5/36; C08K5/43; C08K5/44
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
241 words
A sulfur vulcanizable rubber composition comprising: (a) an elastomer containing olefinic unsaturation and selected from the group consisting of natural rubber, neoprene, polyisoprene, butyl rubber, polybutadiene, styrene-butadiene copolymer, isoprene-styrene copolymer, methyl methacrylate-isoprene copolymer, acrylonitrile-isoprene copolymer, acrylonitrile-butadiene copolymer, EPDM or mixtures thereof; (b) from about 0.50 to about 2.0 phr of a sulfenamide accelerator selected from the group consisting of N-oxydiethylene benzothiazole-2 sulfenamide, N-cyclohexyl-2-benzothiazole sulfenamide, N-t-butyl-2-benzothiazole sulfenamide and N-oxydiethylene-thiocarbamyl-N'-oxydiethylene sulfenamide; (c) from about 0.10 to about 1.0 phr of a guanidine accelerator selected from the group consisting of diphenyl guanidine and di-ortho-tolylguanidine; (d) from about 0.05 to about 1.0 phr of mercaptobenzothiazyl disulfide; (e) from about 0.10 to about 1.0 phr of a thiuram accelerator selected from the group consisting of tetraethyl thiuramdisulfide, tetramethyl thiuram monosulfide, tetramethyl thiuramdisulfide; (f) from about 0.75 to about 3.0 phr of a sulfur vulcanizing agent; (g) from about 0.05 to about 0.50 phr of N-cyclohexylthio-phthalimide; (h) from about 1.0 to about 5.0 phr of a zinc compound selected from the group consisting of zinc oxide and zinc stearate; and (i) from about 0.05 to about 1.0 phr of an activator of the formula: ##STR5## wherein R 1 , R 2 , and R 3 are independently alkyl radicals having 8 to 10 carbon atoms and M is selected from the group consisting of Cl, Br, CH 3 SO 4 and HSO 4 ; and wherein the sulfur vulcanizable rubber has a plasticity of 35 or less.
Claim 2
Dependent Claim
241 words
A sulfur vulcanizable rubber composition comprising: (a) an elastomer containing olefinic unsaturation and selected from the group consisting of natural rubber, neoprene, polyisoprene, butyl rubber, polybutadiene, styrene-butadiene copolymer, isoprene-styrene copolymer, methyl methacrylate-isoprene copolymer, acrylonitrile-isoprene copolymer, acrylonitrile-butadiene copolymer, EPDM or mixtures thereof; (b) from about 0.50 to about 2.0 phr of a sulfenamide accelerator selected from the group consisting of N-oxydiethylene benzothiazole-2 sulfenamide, N-cyclohexyl-2-benzothiazole sulfenamide, N-t-butyl-2-benzothiazole sulfenamide and N-oxydiethylene-thiocarbamyl-N'-oxydiethylene sulfenamide; (c) from about 0.10 to about 1.0 phr of a guanidine accelerator selected from the group consisting of diphenyl guanidine and di-ortho-tolylguanidine; (d) from about 0.05 to about 1.0 phr of mercaptobenzothiazyl disulfide; (e) from about 0.10 to about 1.0 phr of a thiuram accelerator selected from the group consisting of tetraethyl thiuramdisulfide, tetramethyl thiuram monosulfide, tetramethyl thiuramdisulfide; (f) from about 0.75 to about 3.0 phr of a sulfur vulcanizing agent; (g) from about 0.05 to about 0.50 phr of N-cyclohexylthio-phthalimide; (h) from about 1.0 to about 5.0 phr of a zinc compound selected from the group consisting of zinc oxide and zinc stearate; and (i) from about 0.05 to about 1.0 phr of an activator of the formula: ##STR5## wherein R 1 , R 2 , and R 3 are independently alkyl radicals having 8 to 10 carbon atoms and M is selected from the group consisting of Cl, Br, CH 3 SO 4 and HSO 4 ; and wherein the sulfur vulcanizable rubber has a plasticity of 35 or less.
Claim 3
Dependent Claim
19 words
The sulfur vulcanizable rubber composition of claim 1 wherein said elastomer is polyisoprene, polybutadiene, styrene-butadiene copolymer or mixtures thereof.
Claim 4
Dependent Claim
15 words
The sulfur vulcanizable rubber composition of claim 1 wherein the sulfenamide accelerator is N-oxydiethylenebenzothiazole-2 sulfenamide.
Claim 5
Dependent Claim
15 words
The sulfur vulcanizable rubber composition of claim 1 wherein the guanidine accelerator is diphenyl guanidine.
Claim 6
Dependent Claim
15 words
The sulfur vulcanizable rubber composition of claim 1 wherein the thiuram accelerator is tetramethyl thiuramdisulfide.
Claim 7
Dependent Claim
16 words
The sulfur vulcanizable rubber composition of claim 1 wherein the sulfur vulcanization agent is elemental sulfur.
Claim 8
Dependent Claim
15 words
The sulfur vulcanizable rubber composition of claim 1 wherein the zinc compound is zinc oxide.
Claim 9
Dependent Claim
18 words
The sulfur vulcanizable rubber composition of claim 1 wherein M is Cl or CH 3 SO 4 .
Claim 10
Dependent Claim
17 words
The sulfur vulcanizable rubber composition of claim 1 wherein the plasticity ranges from about 25 to 34.
Claim 11
Dependent Claim
17 words
The sulfur vulcanizable rubber composition of claim 9 wherein the plasticity ranges from about 27 to 33.
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) | 1992-08-28 | 1993-02-27 | 1993-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-28 | 1997-02-27 | 1997-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-28 | 2001-02-27 | 2001-08-29 | $7700.00 | Window Closed / Lapsed |