Patent ID: 8110629

Claim:
A flame-retardant composition comprising: an acid-modified hydrogenated block copolymer (a); a polyolefin resin (b); a non-aromatic rubber softener (c); and a metal hydrate (d); wherein the acid-modified hydrogenated block copolymer (a) is prepared by addition of an unsaturated carboxylic acid or a derivative thereof to a non-acid-modified hydrogenated block copolymer, the non-acid-modified hydrogenated block copolymer comprises: at least one polymer block (A), which comprises a vinyl aromatic compound unit; and at least one polymer block (B), which comprises a conjugated diene unit; a content of the vinyl aromatic compound is in a range of 10 to 40% by mass with respect to the total mass of the hydrogenated block copolymer prior to acid modification, a bulk density of the acid-modified hydrogenated block copolymer (a) is 0.1 to 0.4 g/ml, a weight average molecular weight of the non-acid-modified hydrogenated block copolymer is from 50,000 to 500,000, and 0.1 ≦Wa /( Wa+Wb )≦0.9 (1) 0.05 ≦Wc /( Wa+Wb+Wc )≦0.5 (2) 0.4 ≦Wd /( Wa+Wb+Wc+Wd )≦0.75 (3) wherein Wa, Wb, We and Wd are masses of the acid-modified hydrogenated block copolymer (a), the polyolefin resin (b), the non-aromatic rubber softener (c) and the metal hydrate (d), respectively.