US4581400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rubber compositions modified with blends of rosin material
Assignee: Bridgestone Corp
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Filing: 1985-03-27
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Granted: 1986-04-08
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Expires: 2005-03-27
Abstract
Abstract A rubber composition comprising (a) 100 parts by weight of a rubber selected from the group consisting of natural rubber and synthetic diene rubbers and (b) about 1 to about 30 parts by weight of a rosin derivative comprising a blend of (i) about 15 to about 50% by weight of a rosin, (ii) about 10 to about 70% by weight of a polymerized rosin and (iii) not more than about 55% by weight of a rosin pitch, each based on the weight of the rosin derivative.
Inventors
- 👤 Hitoshi Kondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:04
CPC Classifications
C; C08; C08L; C08L7/00; C08L21/00; C08L93/00; C08L93/04; Y; Y10; Y10S; Y10S524/00; Y10S524/925
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
87 words
A rubber composition comprising (a) 100 parts by weight of a rubber selected from the group consisting of natural rubber and synthetic diene rubbers and (b) about 1 to about 30 parts by weight of a rosin derivative comprising a blend of (i) about 15 to about 50% by weight of a rosin, (ii) about 10 to about 70% by weight of a polymerized rosin and (iii) not more than about 55% by weight of a rosin pitch, each based on the weight of the rosin derivative.
Claim 2
Dependent Claim
87 words
A rubber composition comprising (a) 100 parts by weight of a rubber selected from the group consisting of natural rubber and synthetic diene rubbers and (b) about 1 to about 30 parts by weight of a rosin derivative comprising a blend of (i) about 15 to about 50% by weight of a rosin, (ii) about 10 to about 70% by weight of a polymerized rosin and (iii) not more than about 55% by weight of a rosin pitch, each based on the weight of the rosin derivative.
Claim 3
Dependent Claim
18 words
The rubber composition acccording to claim 1, wherein the main component of said rubber (a) is natural rubber.
Claim 4
Dependent Claim
21 words
The rubber composition according to claim 1, wherein said rosin (i) contains abietic acid and isomers thereof as the main components.
Claim 5
Dependent Claim
24 words
The rubber composition according to claim 1, wherein said polymerized rosin (ii) contains dimers of abietic acid and isomers thereof as the main components.
Claim 6
Dependent Claim
52 words
The rubber composition according to claim 1, wherein said rosin pitch (iii) contains about 20 to about 60% by weight of free acids, about 15 to about 45% by weight of ester compounds and about 15 to about 40% by weight of unsaponifiable matter based on the weight of the rosin pitch.
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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) | 1989-04-07 | 1989-10-07 | 1990-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-07 | 1993-10-07 | 1994-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-07 | 1997-10-07 | 1998-04-08 | $7700.00 | Window Closed / Lapsed |