1. Dept of Home Economics, Gifu Women's University, Gifu 501‐25, Japan
2. Dept of Clothing and Textiles, Kyungsung University, Daeyun‐dong, Nam‐gu, Pusan 608, Republic of Korea
3. Osaka Prefectural Industrial Technology Research Institute, Nishi‐ku, Osaka 550, Japan
4. Dept of Fine Materials Engineering, Shinshu University, Ueda, Nagano 386, Japan
5. Meisei Chemical Works, Ukyo‐ku, Kyoto 615, Japan