Patent ID: 7794807

Claim:
A composite sheet, comprising: a substrate layer (A) comprising a polystyrene resin and an ABS resin as the main components, and from 0.1 to 20 parts by mass of a thermoplastic resin that is a styrene/butadiene/butylenes/styrene block copolymer resin having a styrene content of from 10 to 80 mass %, per 100 parts by mass of the total amount of the polystyrene resin and the ABS resin, a reinforcing layer (B) consisting of an ABS resin, and a surface layer (C) comprising, as the main component, a polystyrene resin which comprises a conductive filler, wherein a surface of each side of said composite sheet is a surface layer (C), and said substrate layer (A) comprises said polystyrene resin in an amount of from 5 to 30 parts by mass per 100 parts by mass of the total amount of said polystyrene resin and said ABS resin.