Method for producing water emulsion polyurethane polyacrylate hybrid systems

摘要

Preparing aqueous dispersions containing polyurethane polyacrylate, comprises: e.g. (i) reacting an isocyanate prepolymer comprising (ai) a diisocyanate, (aii) a polyether, (aiii) a polymer diol, (aiv) 2,2-bis-(hydroxymethyl)-alkane monocarboxylic acid, (av) a hydroxy functional ethylenically unsaturated monomer, (avi) at least one short chain diol, (avii) a trifunctional or higher functional alcohol and (aviii) a monofunctional alcohol, with (b) a diamine, (c) a mono-functional amine, (d) a trifunctional or higher functional amine, and (f) a neutralizing agent. Preparing aqueous dispersions containing polyurethane polyacrylate, comprises: (i) reacting an isocyanate prepolymer comprising (ai) 20-60 wt.% of at least one diisocyanate, (aii) 20-80 wt.% to at least one polyether with a number average molecular weight of 600-1600 g/mole, (aiii) 0-30 wt.% of at least one polymer-diol comprising polyester polyols or polycarbonate diols, each with a number average molecular weight of 500-3000 g/mole aiv) 2-12 wt.% of at least a 2,2-bis-(hydroxymethyl)-alkane monocarboxylic acid, (av) 0.1-15 wt.% of at least one hydroxy functional ethylenically unsaturated monomer, (avi) 0-15 wt.% of at least one short chain diol with a number average molecular weight of 62-400 g/mol, (avii) 0-10 wt.% of at least one trifunctional or higher functional alcohol with a number average molecular weight of 62-400 g/mole and (aviii) 0-10 wt.% of at least one monofunctional alcohol with a number average molecular weight of 32-3500 g/mole, with (b) 0-15 wt.% of at least one diamine with a number average molecular weight of 60-300 g/mole, (c) 0-10 wt.% of at least one mono-functional amine with a number average molecular weight 32-350 g/mole, (d) 0-10 wt.% of at least one trifunctional or higher functional amine with a number average molecular weight of 60-300 g/mole and (f) 0.1-10 wt.% of at least one neutralizing agent, to a polyurethane; and (ii) adding ethylenically unsaturated monomers (f), where the mass ratio of the sum of the mass of the monomers (a)-(e) to the mass of the monomer (f) is 90:10-10:90. Independent claims are also included for: (1) an aqueous dispersion obtained by the above mentioned method; and (2) a coating composition comprising the aqueous dispersion.