| 摘要 |
Disclosed is a flame-retardant composition containing a powdery acid-modified hydrogenated block copolymer (a) having a bulk density of 0.1-0.4 g/ml, a polyolefin resin (b), a non-aromatic softening agent (c) for rubbers, and a metal hydrate (d). The acid-modified hydrogenated block copolymer (a) is obtained by adding an unsaturated carboxylic acid or a derivative thereof to a hydrogenated block copolymer which has a weight average molecular weight of 50,000-500,000 and is composed of a polymer block A mainly consisting of a vinyl aromatic compound unit and a polymer block B mainly consisting of a conjugated diene unit. This flame-retardant composition contains the components (a)-(d) at a ratio satisfying the following formulae (1)-(3). 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) (In the formulae, Wa, Wb, Wc and Wd represent the respective masses of the acid-modified hydrogenated block copolymer (a), the polyolefin resin (b), the non-aromatic softening agent (c) for rubbers, and the metal hydrate (d).) |
