Block copolymer

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

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525315, 525316, 526340, 526347, C08F29300

Patent

active

055854435

ABSTRACT:
A block copolymer comprises block A containing as a main component thereof a homopolymer consisting of units of a vinylaromatic hydrocarbon (VAH), block B consisting of units of a conjugated diene (CD), and block C consisting of VAH and CD, is represented by General Formulae (I) or (II), and has a structure in which blocks A, B, and C are repeated in the order shown in the General Formulae (I) or (II). The block copolymer contains 15 to 98% by weight of a block consisting of 20 to less than 200 VAH, 10% or less by weight of a block consisting of 200 or more VAH, 1 to 70% by weight of an isolated single VAH, and a block consisting of 2 to less than 20 VAH in an amount to make up the rest, each based on total VAH; 15 to 65% by weight of total VAH; 85 to 35% by weight of total CD; and a number-average molecular weight of 5.times.10.sup.4 to 150.times.10.sup.4. Another block copolymer has a structure in which the block copolymer described above is coupled by a polyfunctional coupling agent, and is represented by General Formulae (III) or (IV), wherein Y represents the residue of the polyfunctional coupling agent. The block copolymers are advantageously used for a tire tread rubber having higher abrasion resistance, higher tensile strength at high temperatures, and the like, in good balance without adverse effects on other properties.

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