Aqueous binder composition comprising oligomers

摘要

The present invention relates to an aqueous binder composition comprising:
at least one polymer P having a glass transition temperature Tg in the range from −20 to +60° C., in the form of an aqueous polymer dispersion PD which is obtainable by free-radical emulsion polymerization of at least one ethylenically unsaturated monomer M, and0.1 to 10% by weight, based on the sum of polymer P and oligomer, of one or more oligomers which are composed of ethylenically unsaturated monomers and have an average molecular weight Mw of 1000 to 30 000 g/mol, a glass transition temperature Tg in the range from +60 to +120° C., and an acid number in the range from 50 to 350,

to a process for preparing it, to coating materials comprising it, and also to the use of water-soluble oligomers in a mixture with aqueous polymer dispersions in coating materials that lead to coatings featuring increased gloss.

主权项

1. An aqueous binder composition, comprising:
a polymer P having a glass transition temperature Tg in a range from −20 to +60° C., in the form of an aqueous polymer dispersion PD which is obtained by free-radical emulsion polymerization of at least one ethylenically unsaturated monomer M, and an oligomer comprising, in polymerized form, an ethylenically unsaturated monomer and having an average molecular weight Mw of 1000 to 30 000 g/mol, a glass transition temperature Tg in a range from +60 to +120° C., and an acid number in a range from 224 to 350, wherein the oligomer is present in an amount 0.1 to 3% by weight, based on a sum of the polymer P and the oligomer.