Process for the production of a hydroxyl group containing ε-caprolactone modified (METH) acrylate resin

Claim 1

A process for the production of a hydroxyl group containing, ε-caprolactone modified, isocyanate cross-linkable acrylate, or methacrylate resin comprising (1) reacting at least one monoester of acrylic acid or methacrylic acid with an alkanediol having 2 to 4 carbon atoms in the molar ratio of 1.5:1 to 1:3 with ε-caprolactone at a temperature between 60° and 130° C. in the presence of 0.005 to 0.15 weight percent based on the weight of the ε-caprolactone employed of an organotin compound catalyst for the reaction of a hydroxyl group containing compound with ε-caprolactone and (2) copolymerizing (a) 15 to 55 weight percent of the adduct obtained according to (1) with (b) 45 to 85 weight percent of a mixture of monomers which is composed of, in each case based on the weight of component (b), (b 1 ) 10 to 90 weight percent of at least one ester of methacrylic acid whose homopolymerizate has a glass transition temperature of above 60° C., (b 2 ) 10 to 90 weight percent of at least one ester of acrylic or methacrylic acid whose homopolymerizate has a glass transition temperature of below 60° C., (b 3 ) 0 to 35 weight percent of at least one vinyl aromatic compound and (b 4 ) 0 to 10 weight percent of at least one monoester of acrylic or methacrylic acid with an alkanediol having 2 to 4 carbon atoms as a solution in (c) 15 to 45 weight percent based on the total weight of components (a), (b), and (c) of at least one solvent for the acrylate or methacrylate resin which solvent is inert to isocyanates, in the presence of at least