Dai-ichi Kogyo Seiyaku Co., Ltd.

Tadayuki Sugimoto

Takeshi Fujita

Kazuo Sato

Naofumi Saiuchi

Kazuyo Aketa

Radiation-curable polyurethane emulsion compositions that can be diluted with water are disclosed. An emulsion of a polyurethane having active amino groups is prepared, and the emulsion is reacted, in the presence of water, with an isocyanate compound having a polymerizable unsaturated group to introduce the polymerizable unsaturated group into the polyurethane. The introduction of a polymerizable unsaturated group into the polyurethane is accomplished in the presence of water, thereby overcoming prior art problems of polymerization and gelation during the preparation of the emulsion. The present invention provides radiation-curable polyurethane emulsion compositions that can be produced on an industrial scale.

Radiation-curable polyurethane emulsion compositions

The sizing agent according to the present invention contains as the essential component a high molecular compound having an weight-average molecular weight of not less than 20,000 prepared by reacting

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Kyoto, Japan

Tadayuki Sugimoto