1. R&D Center for Bio-based Materials, Kyoto Institute of Technology, Matsugasaki, Kyoto 606-8585, Japan, Paint and Finishing Design Department, Vehicle Engineering Group, Toyota Motor Company, Toyota, Aichi 471-8572, Japan, and Basic Technologies Division, Nippon Bee Chemical Company, Shodai-Ohtani, Hirakata, Osaka 573-1153, Japan