US4491655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rubber containing esters of rosin acid
Assignee: Goodyear Tire and Rubber Co
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Filing: 1984-01-06
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Granted: 1985-01-01
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Expires: 2004-01-06
Abstract
Abstract There is disclosed the use of esters especially methyl esters of rosin acids as total or partial replacements for oil in rubber formulations. Vulcanizate properties, low temperature performance, and processibility are comparable when using either the rosin ester or an aromatic oil, however, the rosin ester extended rubber demonstrates improved abrasion resistance and flex resistance.
Inventors
- 👤 Paul H. Sandstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:11
CPC Classifications
C; C08; C08L; C08L9/00; C08L9/06; C08L21/00; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/101; C08L93/00; C08L93/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
53 words
A process for preparing rubber compositions which comprises admixing a rubber selected from the group consisting of natural rubber, homopolymers of conjugated diolefins and copolymers of conjugated diolefins and ethylenically unsaturated monomers with methyl esters of rosin acids at a concentration from 10 to 70 parts per hundred based on weight of rubber.
Claim 2
Dependent Claim
53 words
A process for preparing rubber compositions which comprises admixing a rubber selected from the group consisting of natural rubber, homopolymers of conjugated diolefins and copolymers of conjugated diolefins and ethylenically unsaturated monomers with methyl esters of rosin acids at a concentration from 10 to 70 parts per hundred based on weight of rubber.
Claim 3
Dependent Claim
36 words
A process for preparing rubber compositions which comprises admixing a methyl ester of rosin acid, at a concentration from 10 parts per hundred to 70 parts per hundred based on weight of rubber, with said rubber.
Claim 4
Dependent Claim
36 words
A process for preparing rubber compositions which comprises admixing a methyl ester of rosin acid, at a concentration from 10 parts per hundred to 70 parts per hundred based on weight of rubber, with said rubber.
Claim 5
Dependent Claim
59 words
In a cured rubber stock containing conventional rubber components, said stock being present in a rubber article, the improvement comprising: the stock having incorporated therein prior to curing thereof an ester of a wood rosin wherein the ester of wood rosin is substituted for at least 20% by weight of a petroleum derived product conventionally contained in said stock.
Claim 6
Dependent Claim
59 words
In a cured rubber stock containing conventional rubber components, said stock being present in a rubber article, the improvement comprising: the stock having incorporated therein prior to curing thereof an ester of a wood rosin wherein the ester of wood rosin is substituted for at least 20% by weight of a petroleum derived product conventionally contained in said stock.
Claim 7
Dependent Claim
19 words
A cured rubber stock according to claim 3 wherein the ester of a wood rosin is the methyl ester.
Claim 8
Dependent Claim
36 words
A process according to claim 1 wherein the rubber is a 70/30 blend of SBR and polybutadiene and wherein the methyl esters of rosin acids is at a level of 35 parts per hundred of rubber.
Claim 9
Dependent Claim
32 words
A cured rubber stock according to claim 3 wherein the methyl ester of a wood rosin is substituted for at least 50% of a petroleum derived product conventionally contained in said stock.
Claim 10
Dependent Claim
51 words
A cured rubber stock according to claim 3 wherein the rubber is a 70/30 blend of SBR and polybutadiene, and wherein the ester of wood rosin in the methyl ester and wherein the methyl ester is substituted for at least 50% of a petroleum derived product conventionally contained in said stock.
Claim 11
Dependent Claim
15 words
A rubber article wherein the rubber is prepared according to the process of claim 1.
Claim 12
Dependent Claim
15 words
A rubber article wherein the rubber is prepared according to the process of claim 2.
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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) | 1988-01-01 | 1988-07-02 | 1989-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-01 | 1992-07-02 | 1993-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-01 | 1996-07-02 | 1997-01-01 | $7700.00 | Window Closed / Lapsed |