Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1993-06-08
1995-04-25
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524505, 525236, 525237, C08L 906, C08L 4700
Patent
active
054099889
ABSTRACT:
The present invention provides a rubber composition comprising:
(i) a rubber component comprising 70 to 90% by weight of a styrene-butadiene copolymer rubber (A) containing 20 to 40% by weight of a styrene content and 30 to 60% by weight of a vinyl content in a butadiene portion, which is obtained by solution polymerization, and 10 to 30% by weight of a polybutadiene rubber (B)
(ii) a vulcanizing agent in an amount of 0.75 to 1.75 parts by weight based on 100 parts by weight of the rubber component (i) and
(iii) a plasticizer;
wherein the plasticizer is present in an amount such that the amount of acetone extract obtained by extracting a vulcanized rubber sample obtained from the rubber composition with a Soxhlet apparatus in an acetone solvent for 24 hours is 20 to 26% by weight of the vulcanized rubber sample, and at least 80% by weight of the acetone extract being the plasticizer.
REFERENCES:
patent: 3366585 (1968-01-01), Davison et al.
patent: 4433094 (1984-02-01), Ogawa et al.
patent: 4515922 (1985-05-01), Sakakibara et al.
patent: 4522970 (1985-06-01), Scriver et al.
patent: 4530959 (1985-07-01), Armbruster et al.
patent: 4745150 (1988-05-01), Ide et al.
patent: 5082901 (1992-01-01), Linster
Derwent WPI Acc. No. 85-289775/47 (1985), Abstract of USP 4,640,952.
Derwent WPI Acc. No.: 87-217747/31 (1987), Abstract of USP 4,745,150.
Asinovsky Olga
Michl Paul R.
Sumitomo Rubber Industries Ltd.
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