Emulsifier-free, heat-curable coating composition, its preparation and use

摘要

Emulsifier-free, heat-curable coating composition in the form of an aqueous emulsion, process for its preparation, and its use. The coating composition contains: A) from 30 to 70% by weight of one or more polyester oligomer-polyacrylates which are water-dilutable after neutralisation with bases and are obtainable by free-radical polymerisation of from 50 to 95% by weight of one or more esters of unsaturated carboxylic acids including hydrophobic and hydrophilic moieties, a) the hydrophobic moieties being based on monomeric esters of unsaturated carboxylic acids containing secondary OH groups, which may be present as a mixture with OH-free comonomers, b) the hydrophilic moieties being based on monomeric esters of unsaturated carboxylic acids containing primary OH groups and monomeric esters of unsaturated carboxylic acids containing COOH groups, which may be present as a mixture with OH-free comonomers, and the numerical ratio of the primary to the secondary OH groups in the copolymer, both deriving from components b) and a), being from 1:1.5 to 1:2.5, in from 5 to 50% by weight of one or more hydroxy-functional polyester oligomers which are obtainable by polycondensation of one or more diols and/or polyols and of one or more dicarboxylic acids and/or derivatives thereof, having a calculated molecular weight of from 200 to 1000, a hydroxyl number of from 100 to 600 and an acid number of from 0 to 15, monomers a) and b) being employed in quantities such that the polyester oligomer-polyacrylate ... a ... Original abstract incomplete.