The Yokohama Rubber Co., Ltd.

Tetsuji Kitamura

Eiji Nishi

Hideyuki Matsuda

Masamichi Danjo

Hitoshi Saito

A moisture-curable urethane-based sealing composition is made up of an urethane prepolymer and a polyurethane compound blended together in specified amounts. The urethane prepolymer is derivable by reacting a selected class of polyether polyols with a selected class of polyisocyanate compounds. The polyurethane compound is available by reacting a selected class of polyether or polyester polyols with a selected class of polyisocyanate compounds, followed by reaction of the resulting prepolymer with a selected class of monoalcohols to thereby binder all isocyanate groups in the prepolymer. The ultimate sealant is adequate in initial adhesion strength, low in glass transition temperature and resistant to moist heat.

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Fujisawa, Japan

Tetsuji Kitamura