Patents by Inventor Kouei Komatsu

Kouei Komatsu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 4053446
    Abstract: Polydiene polyurethanes having high tear strength are obtained by using polydiene glycols, prepared with use of lithium-based catalyst, having a number average molecular weight of 1,000 to 5,000 and functionality of 1.8 - 2.1, diisocyanates and chain-extending agents, and by controlling chemical cross-link density being 4 .times. 10.sup.-5 mole/cc and less. When the chemical cross-link density is within the above range, elongation and tensile strength in addition to tear strength of the polyurethane are improved significantly. Furthermore, when 10 - 50 parts by weight of the specified carbon black are added to 100 parts by weight of the mixture of the prepolymer, the chain-extending agent and the additive prior to curing the prepolymer, these mechanical properties of the polyurethane are improved further.
    Type: Grant
    Filed: August 31, 1976
    Date of Patent: October 11, 1977
    Assignees: Bridgestone Tire Company, Ltd., Japan Synthetic Rubber Company, Ltd.
    Inventors: Yoji Watabe, Michio Ishii, Yutaka Iseda, Kouei Komatsu, Noboru Ohshima, Yozo Nakata, deceased