Patent ID: 9034981
Filing Date: 2015-05-19
Classification: C08G,C09D

Abstract:
1. An aqueous polyurethane dispersion obtained by subjecting a mixture comprising: a) at least one organic, aliphatic, cycloaliphatic or aromatic di, tri or polyisocyanate, b) at least one isocyanate reactive polycarbonate diol, triol or polyol obtained by reaction between an alkyl carbonate and 2,2-dialkyl-1,3-propanediol, a 2-alkyl-2-hydroxyalkyl-1,3-propanediol or a 2,2-dihydroxyalkyl-1,3propanediol, c) at least one linear or branched C d) at least one dihydroxyalkanoic acid, and optionally, e) at least one isocyanate reactive 2,2-dialkyl-1,3-propanediol, 2-alkyl-2-hydroxyalkyl-1,3-propanediol or 2,2-dihydroxyalkyl-1,3propanediol, to reaction subsequent conversion of at least 30% of anionic groups present in obtained reaction product to salt groups by addition of at least base and dispersion in water, said components (a) through (e) being subjected to reaction at a molar ratio isocyanate groups to isocyanate reactive groups of between 1:0.8 and 1:1.2 and said reaction being performed at a temperature of between 20° and 100° C. in presence of at least one catalyst and at least one inert, water miscible solvent.