Rubber composition of tire tread containing block copolymer coup

Details Rubber composition of tire tread containing block copolymer coup Rubber composition of tire tread containing block copolymer coup

1989-03-08

1990-04-17

Briggs, Sr., Wilbert J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525271, 525314, C08F29704, C08L 5302

Patent

active

049181424

ABSTRACT:
A rubber composition suitable for tire treads having well-balanced excellent steering stability in cornering, wet skid characteristic, ice skid characteristic and rolling characteristic, and an excellent processability, which comprises a rubber component containing a block copolymer consisting essentially of a block A and a block B, obtained by conducting polymerization of an aromatic vinyl compound and a conjugated diene compound in a hydrocarbon solvent in the presence of an organolithium initiator and modifying with a coupling agent, and satisfying the following conditions (A) to (E);
(A) the block A having a content of an aromatic vinyl compound of 5 to 29% by weight and a content of 1,2-bonds in the conjugated diene component of 25 to 55% by weight,
(B) the block B having a content of an aromatic vinyl compound of 35 to 60% by weight and a content of 1,2-bonds in the conjugated diene component of 20 to 70% by weight,
(C) the content of the block A in the block copolymer being from 20 to 80% by weight,
(D) the average content of the aromatic vinyl compound in the block copolymer being from 20 to 40% by weight and the average content of 1,2-bonds in the conjugated diene component of the block copolymer being from 20 to 60% by weight, and
(E) at least 40% by weight of the polymer chains of the block copolymer being a branched polymer formed by modification with a trifunctional or tetrafunctional coupling agent.

REFERENCES:
patent: 4482678 (1984-11-01), Furukawa
patent: 4523618 (1985-06-01), Yamamoto et al.
patent: 4575534 (1986-03-01), Oshima et al.
Yoshida et al., Ser. No. 5400, filed 2/2/87.
Furukawa et al., Ser. No. 817949, filed 12/17/85.
Takao et al., Ser. No. 137856, filed 12/8/87.
Takao et al., Ser. No. 112989, filed 10/27/87.
Takao et al., Ser. No. 111336, filed 10/22/87.
Takao et al., Ser. No. 137859, filed 12/8/87.

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