Patent ID: 6337360
Filing Date: 2002-01-08
Classification: C08F,C09J,Y10S,Y10T

Abstract:
A method of priming a metal surface, comprising:applying an aqueous polymer dispersion on a surface of a metal; wherein said aqueous dispersion comprises a particulate poly(meth)acrylate comprising the following monomeric components: (A) 50-90 wt. % of a methacrylic acid alkyl ester; (B) 5-30 wt. % of an acrylic acid alkyl ester having a glass transition temperature Tg in the range of âˆ’20 to 50Â° C. and having formula I: wherein R1 represents an alkyl, aryl, or alkaryl group having 2-10 C atoms; (C) 2-10 wt. % of a functionalized monomer of formula II: wherein R2 represents hydrogen or methyl; and R3 represents a glycidyl group or an alkyl group which has 2-6 C atoms and is substituted with at least one hydroxyl group; (D) 2-10 wt. % of at least one radically polymerizable carboxylic acid or a polycarboxylic acid or a partially esterified polycarboxylic acid; and (E) 0-40 wt. % of other monomers which are copolymerizable with (A) to (D); wherein, in the process of preparation, in a first polymerization stage, monomers (A) to (C) and optionally (E) are copolymerized; wherein in a second polymerization stage, monomers (A), (B), (D) and optionally (E) are copolymerized; and wherein the sum of the amounts of monomers (A) to (E) is 100 wt. % in each polymerization stage.