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
1986-12-15
1988-03-22
Lieberman, Allan M.
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...
524496, 524505, 525 95, 525 98, 525196, C08K 304, C08L 709, C08L 900, C08L 906
Patent
active
047329270
ABSTRACT:
A rubber composition for treads characterized in that the composition comprises 100 parts by weight of a rubber component and 50 to 100 parts by weight of carbon black admixed therewith, the rubber component comprising 10 to 50 parts by weight of a solution-polymerized star styrene-butadiene rubber (I) having specific styrene content, vinyl content of the butadiene portion and at least 40% in the efficiency of coupling with a tin halide, 20 to 70 parts by weight of a solution-polymerized straight-chain styrene-butadiene rubber (II) having specific styrene content and vinyl content of the butadiene portion and 10 to 50 parts by weight of natural rubber or isoprene rubber (III), the carbon black being in the range of 75 to 105 in nitrogen adsorption specific surface area (N.sub.2 SA), at least 15 in the difference between N.sub.2 SA and the iodine adsorption number (IA) thereof and 0 to 5 in the difference between N.sub.2 SA and the cetylitrimethylammonium bromide adsorption specific surface area (CTAB) thereof, the composition being -50.degree. to -30.degree. C. in the peak temperature of loss tangent, tan .delta..
REFERENCES:
patent: 4071496 (1978-01-01), Kraus et al.
patent: 4111867 (1978-09-01), Komuro et al.
patent: 4383085 (1983-05-01), Fujimaki et al.
patent: 4398582 (1983-08-01), Yuto et al.
patent: 4433094 (1984-02-01), Ogawa et al.
Ida Eiji
Oda Keijiro
Lieberman Allan M.
Toyo Tire & Rubber Company Limited
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