Specific examples of such a thermoplastic resin include acrylic polymer such as polyacrylic acid ester, copolymer thereof, polymethacrylic acid ester, copolymer thereof, polyacrylonitrile, copolymer thereof, polyacrylamide, polyacrylic acid and polymethacrylic acid; polyolefinic polymer such as polyethylene, polystyrene and copolymer thereof; vinyl acetate polymer or vinyl acetate copolymer such a