For example, when the first resin is a styrenic resin (for example, polystyrene or a styrene-acrylonitrile copolymer), examples of second resins usable herein include cellulose derivatives (for example, cellulose esters such as cellulose acetate propionate), (meth)acrylic resins (for example, polymethyl methacrylate), alicyclic olefinic resins (for example, polymers using norbornene as a monomer),