Elastic filaments for composition, elastic filaments and stretchable sheet

摘要

PPROBLEM TO BE SOLVED: To provide a composition for an elastic filament, wherein high modulus and small permanent elongation coexists in a high level, and which can be formed into an elastic filament with good moldability. PSOLUTION: The composition for an elastic filament contains a block copolymer composition comprised of a block polymer A represented by general formula (A) and a block polymer B represented by general formula (B): Ar1SPa/SP-DSPa/SP-Ar2SPa/SP(A) and (ArSPb/SP-DSPb/SP)SBn/SB-X (B), wherein Ar1SPa/SPand ArSPb/SPare each an aromatic vinyl polymer block having a weight average molecular weight of 6,000-15,000, Ar2SPa/SPis an aromatic vinyl polymer block having a weight average molecular weight of 40,000-400,000, DSPa/SPand DSPb/SPare each a conjugated diene polymer block containing 1-20 mol% vinyl bond, X is a single bond or a residue of a coupling agent, and n is an integer of at least 2. PCOPYRIGHT: (C)2011,JPO&INPIT