US4468496A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polybutadiene rubber compositions
Assignee: Bridgestone Corp
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Filing: 1982-07-26
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Granted: 1984-08-28
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Expires: 2002-07-26
Abstract
Abstract A rubber composition having excellent fracture properties and cut growth resistance is disclosed, which consists of 10-95 parts by weight of polybutadiene having a content of cis-1,4 bond of at least 70% and an average chain length of 1,4-sequence of 110-450 and 90-5 parts by weight of at least one diene rubber.
Inventors
- 👤 Yasumasa Takeuchi
- 👤 Mitsuhiko Sakakibara
- 👤 Nobuo Tagata
- 👤 Masaki Ogawa
- 👤 Yasushi Hirata
- 👤 Shigeru Tomihira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:27
CPC Classifications
C; C08; C08L; C08L7/00; C08L23/00; C08L23/02; C08L23/16; C08L23/26; C08L23/28; C08L23/283; C08L9/00; C08L23/18; C08L23/20; C08L23/22; C08L9/02; C08L9/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
53 words
A rubber composition having excellent fracture properties and cut growth resistance, consisting of 10 to 95 parts by weight of polybutadiene having a content of cis-1,4 bond of at least 70% and an average chain length of 1,4-sequence of 110-450 and 90 to 5 parts by weight of at least one diene rubber.
Claim 2
Dependent Claim
53 words
A rubber composition having excellent fracture properties and cut growth resistance, consisting of 10 to 95 parts by weight of polybutadiene having a content of cis-1,4 bond of at least 70% and an average chain length of 1,4-sequence of 110-450 and 90 to 5 parts by weight of at least one diene rubber.
Claim 3
Dependent Claim
20 words
The rubber composition according to claim 1, wherein said average chain length of 1,4-sequence of polybutadiene is 130 to 300.
Claim 4
Dependent Claim
19 words
The rubber composition according to claim 1, wherein said content of cis-1,4 bond of polybutadiene is at least 90%.
Claim 5
Dependent Claim
24 words
The rubber composition according to claim 1, wherein a heat of fusion of a hydrogenation product of said polybutadiene is 42 to 135 cal/g.
Claim 6
Dependent Claim
38 words
The rubber composition according to claim 1, wherein said diene rubber is selected from the group consisting of natural rubber, polyisoprene rubber, styrene-butadiene copolymer rubber, acrylonitrilebutadiene copolymer rubber, ethylene-propylene-diene terpolymer rubber, isobutylene-isoprene copolymer rubber and halogenated(isobutylene-isoprene copolymer) rubber.
Claim 7
Dependent Claim
34 words
The rubber composition according to claim 1, wherein the amount of said polybutadiene is 30 to 95 parts by weight and the amount of said diene rubber is 70 to 5 parts by weight.
Claim 8
Dependent Claim
19 words
The rubber composition according to claim 1, wherein said content of cis-1,4 bond of polybutadiene is at least 90-98%.
Claim 9
Dependent Claim
43 words
The rubber composition according to claim 1, wherein said polybutadiene is polymerized using a catalyst consisting of a combination of a compound of a lanthanum series rare earth element, an organoaluminum compound and at least one of a Lewis acid and Lewis base.
References Cited (Backward Citations)
US3060989A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-28 | 1988-02-27 | 1988-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-28 | 1992-02-27 | 1992-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-28 | 1996-02-27 | 1996-08-28 | $7700.00 | Window Closed / Lapsed |