total amount of the resins.In the raw materials for the urethane resin, as concrete examples of the hydroxyl group-containing resin, polyalkylene glycols such as polyethylene glycol, polybutylene glycol, and polypropylene glycol, alkylene oxide adducts such as bis-phenolA, various species of glycol, and polyester polyols possessing a hydroxyl group at a terminal of molecular chain may be cited.As