The polyolefinic resin includes, for example, a homopolymer or copolymer of an olefin such as a polyethylene, a polypropylene, an ethylene-propylene copolymer, a poly(methylpentene-1); a copolymer of an olefin and a copolymerizable monomer (e.g., an ethylene-vinyl acetate copolymer, an ethylene-(meth)acrylic acid copolymer, an ethylene-(meth)acrylate copolymer).