The thermoplastic resins which can be used here include those publicly known such as acrylonitrile-butadiene copolymer (NBR), acrylonitrile-butadiene rubber-styrene resin (ABS), styrene-butadiene-ethylene resin (SEBS), acrylic resin, polyvinyl butyral, polyamides, polyesters, polyimides, polyamideimides and polyurethanes.