1. a Department of Polymer Chemistry Faculty of Engineering , Kyoto University , Kyoto, 606, Japan
2. b Kurosaki Factory, Mitsubishi Chemical Industries Inc. , Kurosaki, Yawata-Nishi-ku, Kitakyushu-shi, 806, Japan.
3. c Technical Research Center, Shikishima Cotton Spinning Co. , 103 Fushio-cho, Ikeda-shi, 563, Japan.