Takeda Chemical Industries, Inc.

Fumiaki Hirata

Ichiro Minato

Tatsuya Nakashima

An optical urethane resin is obtained by reacting a polyiso(thio)cyanate compound having a hydrolyzable chlorine content of not greater than 300 ppm with an active hydrogen compound. There is provided an optical urethane resin with a minimum of coloration, a high total light transmittance and free of optical distortion.

Optical urethane resin

A polyisocyanate having an isocyanurate ring which is obtained by reacting a diisocyanate compound selected from the group consisting of alkylene, cycloalkylene and aralkylene diisocyanates with a monoalcohol of 10 to 50 carbon atoms in the presence of an isocyanuration catalyst, and removing of the unreacted diisocyanate compound from the reaction mixture, can be used in combination with various polyols, in the main, for the preparation of coatings, adhesives, architectural materials, molding materials, etc.

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Sakai, Japan

Fumiaki Hirata