Rubber composition for tire

Assignee: Bridgestone Corp

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Filing: 1981-09-16

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Granted: 1983-05-10

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Expires: 2001-09-16

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Abstract

Abstract A rubber composition for tire having low rolling resistance and high wet skid resistance, breakage strength and wear resistance consists mainly of a rubber component containing at least 20 parts by weight of a high vinyl butadiene-styrene copolymer rubber obtained by copolymerizing randomly styrene with 1,3-butadiene, and containing 3-30% by weight of bonded styrene and 60-95% by weight of 1,2-bond in butadiene unit, and further containing metal-butadienyl bonds in its main chain in a weight fraction of at least 20% by weight.

Inventors

👤 Tatsuo Fujimaki
👤 Shinsuke Yamaguchi
👤 Tomoharu Yamada
👤 Seisuke Tomita

Bibliographic Details

Application Number —

Jurisdiction US

Data Source google_patents

Last Synchronized 2026-10-24 10:54

CPC Classifications

C; C08; C08L; C08L7/00; B; B60; B60C; B60C1/00; B60C1/0016; C08C; C08C19/00; C08C19/30; C08C19/42; C08C19/44; C08L9/00; C08L9/06; Y; Y02; Y02T; Y02T10/00; Y02T10/80; Y02T10/86

Claims Analysis

Total Claims: 5

Claim 1

Independent Claim 113 words

A rubber composition for a tire tread consisting mainly of a rubber component containing at least 20 parts by weight, based on 100 parts by weight of the rubber component, of a high vinyl butadiene-styrene copolymer rubber obtained by copolymerizing randomly styrene with 1,3-butadiene, and containing 3-30% by weight of bonded styrene and 60-95% by weight of 1,2-bond in the butadiene unit, and further containing bonds of at least one metal selected from silicon, germanium, tin and lead with butadienyl group in its main chain in a weight fraction of at least 20% by weight, wherein said rubber component is a diene rubber having a glass transition temperature not higher than -50° C.

Claim 2

Dependent Claim 113 words

Claim 3

Dependent Claim 90 words

A rubber composition for a tire tread according to claim 1, wherein the rubber component is a rubber blend consisting of 20-80 parts by weight of said high vinyl butadiene-styrene copolymer rubber and 80-20 parts by weight of at least one diene rubber having a glass transition temperature not higher than -50° C., which is selected from the group consisting of natural rubber, synthetic polyisoprene rubber, ethylene-propylene-diene ternary copolymer rubber, and polybutadiene rubber and styrene-butadiene copolymer rubber containing not more than 50% by weight of 1,2-bond in the butadiene unit.

Claim 4

Dependent Claim 42 words

A rubber composition for a tire tread according to claim 1, wherein said high vinyl butadiene-styrene copolymer rubber contains 3-10% by weight of bonded styrene and from more than 80% by weight to 95% by weight of 1,2-bond in the butadiene unit.

Claim 5

Dependent Claim 35 words

A rubber composition for a tire tread according to claim 1, wherein said high vinyl butadiene-styrene copolymer rubber contains 15-30% by weight of bonded styrene and 60-75% by weight of 1,2-bond in the butadiene unit.

References Cited (Backward Citations)

GB1504734A Cited

US4350621A Cited

US4334567A Cited

US4220564A Cited

US4192366A Cited

US4224197A Cited

US4309318A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1986-05-09	1986-11-08	1987-05-10	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1990-05-09	1990-11-08	1991-05-10	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1994-05-09	1994-11-08	1995-05-10	$7700.00	Window Closed / Lapsed

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