On the other hand, for example, when the first polymer is a cellulose derivative (for example, a cellulose ester such as cellulose acetate propionate), examples of second polymers usable herein include styrenic resins (for example, polystyrene or styrene-acrylonitrile copolymer), (meth)acrylic resins, alicyclic olefinic resins (for example, polymers using norbornene as a monomer), polycarbonate re