Patent EP0354759A2 successfully refreshed from Google Patents.
US4996262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester reinforced rubber
Assignee: Goodyear Tire and Rubber Co
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Filing: 1989-03-27
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Granted: 1991-02-26
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Expires: 2009-03-27
Abstract
Abstract It is often desirable to increase the modulus of rubbers utilized in a wide variety of applications. This invention discloses a technique for modifying rubbers to improve their modulus without sacrificing other properties. By utilizing the process of this invention, rubber compositions having increased modulus are prepared by grafting polyester onto rubber. This can be accomplished by reacting a polydiene rubber with a thioacid or maleic anhydride and subsequently with the polyester. It is also possible to prepare such polyester modified rubber compositions by reacting an epoxidized rubber with the polyester.
Inventors
- 👤 James B. Pyke
- 👤 Richard G. Bauer
- 👤 Donald J. Burlett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:43
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/28; C08C19/30; C08C19/34; C08C19/40; C08G; C08G81/00; C08G81/02; C08G81/024; C08G81/027
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
81 words
A process for preparing a rubber composition having a high modulus which comprises reacting at least one epoxidized rubber containing double bonds and which is comprised of repeat units which are derived from conjugated diene monomers and/or nonconjugated diene monomers with from about 20 phr to about 100 phr of at least one polyester elastomer having a melting point of less than about 240° C. at a temperature which is within the range of about 140° C. to about 300° C.
Claim 2
Dependent Claim
81 words
A process for preparing a rubber composition having a high modulus which comprises reacting at least one epoxidized rubber containing double bonds and which is comprised of repeat units which are derived from conjugated diene monomers and/or nonconjugated diene monomers with from about 20 phr to about 100 phr of at least one polyester elastomer having a melting point of less than about 240° C. at a temperature which is within the range of about 140° C. to about 300° C.
Claim 3
Dependent Claim
19 words
A process as specified in claim 1 wherein the epoxidized rubber is less than about 40 mole percent epoxidized.
Claim 4
Dependent Claim
26 words
A process as specified in claim 1 wherein from about 0.05 to about 10 percent of the double bonds in the epoxidized rubber have been epoxidized.
Claim 5
Dependent Claim
26 words
A process as specified in claim 1 wherein from about 0.1 to about 2 percent of the double bonds in the epoxidized rubber have been epoxidized.
Claim 6
Dependent Claim
21 words
A process as specified in claim 1 wherein the polyester elastomer has a melting point of less than about 200° C.
Claim 7
Dependent Claim
22 words
A process as specified in claim 1 wherein from about 25 phr to about 80 phr of the polyester elastomer is utilized.
Claim 8
Dependent Claim
22 words
A process as specified in claim 1 wherein from about 35 phr to about 65 phr of the polyester elastomer is utilized.
Claim 9
Dependent Claim
26 words
A process as specified in claim 1 wherein the process is conducted at a temperature within the range of about 160° C. to about 270°) c.
Claim 10
Dependent Claim
22 words
A process as specified in claim 1 wherein the process is conducted at a temperature within the range of about 170° C.
Claim 11
Dependent Claim
10 words
The rubber composition made by the process specified in claim.
Claim 12
Dependent Claim
11 words
The rubber composition made by the process specified in claim 2.
Claim 13
Dependent Claim
11 words
The rubber composition made by the process specified in claim 3.
Claim 14
Dependent Claim
11 words
The rubber composition made by the process specified in claim 4.
Claim 15
Dependent Claim
11 words
The rubber composition made by the process specified in claim 5.
Claim 16
Dependent Claim
11 words
The rubber composition made by the process specified in claim 6.
Claim 17
Dependent Claim
11 words
The rubber composition made by the process specified in claim 7.
Claim 18
Dependent Claim
11 words
The rubber composition made by the process specified in claim 8.
Claim 19
Dependent Claim
11 words
The rubber composition made by the process specified in claim 9.
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) | 1994-02-25 | 1994-08-27 | 1995-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-25 | 1998-08-27 | 1999-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-25 | 2002-08-27 | 2003-02-26 | $7700.00 | Window Closed / Lapsed |