Aqueous polymer latex of film-forming copolymers suitable as binder in waterborne coating compositions

Abstract

The present invention relates to aqueous polymer latices of a film-forming copolymer obtainable by aqueous emulsion polymerisation of ethylenically unsaturated monomers M, which comprise i. 5 to 70% by weight, in particular 10 to 60% by weight, based on the total amount of monomers M, of at least one monomer M1, which is selected from cyclopentyl acrylate, cyclopentyl methacrylate and mixtures thereof; ii. 20 to 90% by weight, in particular 30 to 80% by weight, based on the total amount of monomers M, of at least one monomer M2, which is selected from C2-C20-alkyl esters of acrylic acid, except for tert-butyl acrylate, and C5-C20-alkyl esters of methacrylic acid and mixtures thereof; iii. 0 to 40% by weight, in particular 0 to 35% by weight, based on the total amount of monomers M, of one or more monomer M3, which is selected from tert-butyl acrylate, C1-C4-alkyl esters of methacrylic acid, cyclohexyl methacrylate, isobornylmethacrylate and monovinyl aromatic monomers and mixtures thereof; where the total amount of monomers M1 and M3 is in the range from 5 to 70% by weight, in particular at least 10 to 60% by weight, based on the total amount of ethylenically unsaturated monomers M, and where the total amount of monomers M1, M2 and M3 is at least 85% by weight, based on the total amount of ethylenically unsaturated monomers M. The present invention also relates to a process for producing the aqueous polymer latices of the present invention. The process comprises performing an aqueous emulsion polymerisation of the monomers M. The present invention also relates to the use of these polymer latices as binders in waterborne coating compositions.

Dependencies are inferred from the claim text.