Examples of the resin usable in the present invention include polyolefin resins such as polyethylene, polypropylene, polystyrene and polymethylpentene; alicyclic polyolefin resins; polyamide resins such as nylon 6 and nylon 66; aramid resins; polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polypropylene terephthalate, polybutyl succinate and polyethylene 2,6-naphth