3Adachi Hideaki, et al. Leather-like Sheet Comprising Bundles of Entangled Nonwoven Fabrics and Urethane Rubbers and Manufacture of the Sheet, Jpn. Kokai Tokkyo Koho, JP 2001081676.
4Nakayama Kimio, Yamasaki Tsuyoshi, Tamba Yoshihiro. Fibrous Substrate for Artificial Leather and Artificial Leather Using the Same, EP 1067234.
5Adachi Hideaki, et al. Leather-like Sheets Containing Microfibers and Strong Alkali-free and Solventless Method for Their Manufacture, Jpn. Kokai Tokkyo Koho, JP 2002061080.
6Kimura Tatsuo. Production of Nubuck-tone Artificial Leather, JP 3161576A2.
7Ashida, et al. Suede-Like Artificial Leather, USP 5503899.
8Dainippon Ink and Chemicals, Inc., Aqueous Urethane Resin Composition for Forming Microporous Material, Method for Preparing Fiber Sheet Composite and Synthetic Leather, EP 1164169.
9Teijin Limited, Daiwabo Co. Ltd.. Nonwoven Fabric,and Sheetlike Materials and Synthetic Leathers Made by Using the Same, EP 1028186.
10Honjo Takeshi, et al. Polyester Multifilament-Based Synthetic Leather with Good Elasticity, Jpn. Kokai Tokkyo Koho, JP 2001164477.