Polyurethanes with covalently bonded photoinitiator units

Details Polyurethanes with covalently bonded photoinitiator units Polyurethanes with covalently bonded photoinitiator units

C - Chemistry, Metallurgy

08

G

C08G 18/28 (2006.01) B05D 3/06 (2006.01) C08G 18/08 (2006.01) C08G 18/30 (2006.01) C08G 18/32 (2006.01) C08G 18/65 (2006.01) C08G 18/67 (2006.01) C08L 75/04 (2006.01) C08L 75/14 (2006.01) C09D 175/04 (2006.01) C09D 175/14 (2006.01)

Patent

CA 2222922

A polyurethane which is substantially self-dispersible in water and is obtainable by reacting a) at least one polyisocyanate with b) at least one polyol and c) at least one photoinitiator of the general formula I (see fig. I) where R is a radical of the formula II (see fig. II) or is -CR7R8R9, P(=O)(R10)2 or SO2R11, the number-average molecular weight Mn of the polyurethane being greater than 2700, and its use. The invention also relates to aqueous polyurethane resin dispersions and coating compositions comprising the novel polyurethanes, and to their use.

Un polyuréthane, en grande partie auto-dispersable dans l'eau et qui est obtenu par réaction a) d'au moins un polyisocyanate avec b) au moins un polyol et c) au moins un photo-initiateur de formule générale I (voir fig. I), où R est un radical de formule II (voir fig. II), -CR7R8R9, P(=O)(R10)2 ou SO2R11, le poids moléculaire moyen du polyuréthane étant supérieur à 2700; son utilisation. L'invention porte également sur des dispersions aqueuses de résine de polyuréthane et sur des compositions de revêtement renfermant les nouveaux polyuréthanes, ainsi que sur leur emploi.

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