CURABLE AQUEOUS POLYURETHANE DISPERSIONS MADE FROM RENEWABLE RESOURCES

摘要

A curable aqueous polyurethane dispersion is formed by reacting a polyol a) component with a polyisocyanate b) in excess to form a polyurethane pre-polymer which is neutralized and dispersed before chain extending with a chain extender c) to form the final polyurethane polymer aqueous dispersion. The polyol a) component comprises a1) at least one non-ionic polyol, a 2) at least one polyol bearing at least one ionic or potentially ionic group comprising an acid group or salt thereof and a3) at least one ethylenically unsaturated monoalcohol or polyol. The polyol component contains carbon atoms from renewable resources. A method for making the curable aqueous polyurethane dispersion, uses of the aqueous polyurethane dispersion, cured polyurethanes are also disclosed.

主权项

1. A curable polyurethane polymer aqueous dispersion, wherein said curable polyurethane is formed by:
i) the reaction of a) at least one polyol component comprising a1) a non-ionic polyol, a2) at least one polyol bearing at least one ionic or potentially ionic group comprising an acid group or salt thereof and a3) at least one ethylenically unsaturated monoalcohol and/or polyol, with b) at least one polyisocyanate, wherein the number of isocyanate (NCO) groups of the at least one polyisocyanate is in excess with respect to the number of hydroxyl (OH) groups of the at least one polyol component a), wherein said at least one polyol component a) comprises carbon atoms from renewable resources, with said acid group of polyol a2) being either in the acid form or in the at least partly neutralized form, and said reaction being continued by ii) an extension reaction with an isocyanate-reactive chain extender in a second step.