US4474908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rubber compositions
Assignee: PPG Industries Ohio Inc
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Filing: 1982-05-27
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Granted: 1984-10-02
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Expires: 2002-05-27
Abstract
Abstract The abrasion resistance of siliceous filler-reinforced rubber vulcanizates is improved by adding to the unvulcanized rubber composition silane coupling agent comprising a mixture of a mercaptosilane, such as mercaptopropyltrimethoxysilane, and an alkyl alkoxysilane, such as methyltrimethoxysilane. The mercaptosilane is present in amounts of between 0.3 and 15 parts per hundred parts of rubber, and the weight ratio of mercaptosilane to alkyl alkoxysilane is between 0.15:1 and 15:1. Preferably, the silanes in a ratio of about 1:1 are admixed with a hydrocarbon process oil and the oil-silane mixture added to the siliceous filler-rubber mixture.
Inventors
- 👤 Melvin P. Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:38
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/54
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
154 words
In a rubber composition comprising a curable rubber, from 10 to 90 parts, per 100 parts of rubber, of finely divided reinforcing siliceous pigment, and a silane coupling agent, the improvement wherein the silane coupling agent is a combination of a mercaptosilane and an alkoxysilane and said mercaptosilane and alkoxysilane are admixed simultaneously with said siliceous pigment, said mercaptosilane having the graphic formula, ##STR2## and said alkoxysilane having the graphic formula, R"--Si--(OR').sub.3, wherein X is halogen or --OR', M is hydrogen, C 1 -C 10 alkyl, or halosubstituted C 1 -C 10 alkyl, R is C 1 -C 4 alkylene, R' and R" are each selected from C 1 -C 10 alkyl, and n is 1, 2 or 3, the mercaptosilane being present in said rubber composition in amounts of between 0.3 and 15 parts, per 100 parts of rubber, and the weight ratio of mercaptosilane to alkoxysilane therein being between 0.15:1 and 15:1.
Claim 2
Dependent Claim
154 words
In a rubber composition comprising a curable rubber, from 10 to 90 parts, per 100 parts of rubber, of finely divided reinforcing siliceous pigment, and a silane coupling agent, the improvement wherein the silane coupling agent is a combination of a mercaptosilane and an alkoxysilane and said mercaptosilane and alkoxysilane are admixed simultaneously with said siliceous pigment, said mercaptosilane having the graphic formula, ##STR2## and said alkoxysilane having the graphic formula, R"--Si--(OR').sub.3, wherein X is halogen or --OR', M is hydrogen, C 1 -C 10 alkyl, or halosubstituted C 1 -C 10 alkyl, R is C 1 -C 4 alkylene, R' and R" are each selected from C 1 -C 10 alkyl, and n is 1, 2 or 3, the mercaptosilane being present in said rubber composition in amounts of between 0.3 and 15 parts, per 100 parts of rubber, and the weight ratio of mercaptosilane to alkoxysilane therein being between 0.15:1 and 15:1.
Claim 3
Dependent Claim
20 words
The composition of claim 1 wherein there is present at least 0.75 parts, per hundred parts of rubber, of mercaptosilane.
Claim 4
Dependent Claim
20 words
The composition of claim 1 wherein there is present at least 1.0 parts, per hundred parts of rubber, of mercaptosilane.
Claim 5
Dependent Claim
19 words
The composition of claims 1 or 2 wherein the ratio of mercaptosilane to alkoxysilane is between 0.6:1 and 6:1.
Claim 6
Dependent Claim
15 words
The composition of claim 3 wherein the ratio of mercaptosilane to alkoxysilane is about 1:1.
Claim 7
Dependent Claim
18 words
The composition of claims 1, 2 or 3 wherein the mercaptosilane is mercaptopropyltrimethoxysilane and the alkoxysilane is methyltrimethoxysilane.
Claim 8
Dependent Claim
13 words
The composition of claim 6 wherein the curable rubber is a sulfur-curable rubber.
Claim 9
Dependent Claim
19 words
The composition of claim 6 wherein the ratio of mercaptosilane to alkoxysilane is from about 0.6:1 to about 6:1.
Claim 10
Dependent Claim
15 words
The composition of claim 6 wherein the ratio of mercaptosilane to alkoxysilane is about 1:1.
Claim 11
Dependent Claim
13 words
The composition of claim 9 wherein the curable rubber is a sulfur-curable rubber.
Claim 12
Dependent Claim
12 words
The composition of claim 10 wherein the rubber is a styrene-butadiene rubber.
Claim 13
Dependent Claim
24 words
The composition of claims 1, 2 or 3 wherein the silane coupling agent is added to the composition admixed with a rubber process oil.
Claim 14
Dependent Claim
13 words
A vulcanizate prepared from the rubber composition of claims 1, 2 or 3.
Claim 15
Dependent Claim
10 words
A vulcanizate prepared from the rubber composition of claim 6.
Claim 16
Dependent Claim
10 words
A vulcanizate prepared from the rubber composition of claim 8.
Claim 17
Dependent Claim
10 words
A vulcanizate prepared from the rubber composition of claim 9.
Claim 18
Dependent Claim
10 words
A vulcanizate prepared from the rubber composition of claim 11.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-02 | 1988-04-02 | 1988-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-02 | 1992-04-02 | 1992-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-02 | 1996-04-02 | 1996-10-02 | $7700.00 | Window Closed / Lapsed |