Rubber composition

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...

Reexamination Certificate

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Details

C525S315000

Reexamination Certificate

active

07119147

ABSTRACT:
A rubber composition which prevents the rise in rubber hardness over time and can maintain good performance on snow and ice over a long period, which includes (A) a diene rubber containing, as a main component, at least one member selected from the group consisting of natural rubber and butadiene rubber, and (B) 5 to 60 parts by weight of vegetable oil which has an iodine value of at least 80 and contains at least 70% by weight of unsaturated fatty acid having at least 18 carbon atoms, based on 100 parts by weight of the diene rubber (A), the rubber composition having a tan δ peak temperature Tg of at most −50° C. and a rubber hardness of at most 64 at 0° C. The present invention also relates to a pneumatic tire using the rubber composition as the tread.

REFERENCES:
patent: 5252649 (1993-10-01), Hausmann
patent: 5604290 (1997-02-01), Aikawa et al.
patent: 2002/0019478 (2002-02-01), Ohyama et al.
patent: 2003/0100661 (2003-05-01), Kikuchi et al.
patent: 561761 (1993-09-01), None
patent: 0 677 548 (1995-10-01), None
patent: 1 085 049 (2001-03-01), None
patent: 1 209 194 (2002-05-01), None
patent: 1 234 852 (2002-08-01), None
patent: 55112247 (1980-08-01), None
patent: 58-74731 (1983-05-01), None
patent: 6-31546 (1994-02-01), None
patent: 7-216140 (1995-08-01), None
patent: 8-302077 (1996-11-01), None
patent: 2001-81243 (2001-03-01), None
Derwent abstract ACC-NO:1993-297020, for EP 561761-A1, Hausmann (Sep. 22, 1993).
USPTO obtained translation of EP 561761-A1 (Sep. 22, 1993), Hausmann, Bernadette Dr.
Derwent abstract ACC-NO: 1980-72551C, of JP 55-112247-A.
USPTO obtained translation of JP 60-031546-A.
Derwent machine assisted translation of JP 7-18120-A.
Abstract XP-002240318 of reference JP 62 004732 A.
Abstract for Publication No. JP 62 241933 A.

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