Patent ID: 8568522
Filing Date: 2013-10-29
Classification: C09D,C23C

Abstract:
1. An acidic preparation for passivating metallic surfaces with a pH of less than or equal to 5, comprising water and 0.1 to 50% by weight, based on the amount of all components of said acidic preparation, of at least one water-soluble or water-dispersible copolymer comprising phosphoric and/or phosphonic acid groups, wherein aqueous dispersions of crosslinking polymer particles of water-insoluble polymers are excluded, and wherein said at least one water-soluble or water-dispersible copolymer consists of the following monomeric units: (A) 5 to 80% by weight of at least one mono(meth)acrylic ester of formula H (B) 10 to 75% by weight of at least one monoethylenically unsaturated monomer which comprises phosphoric and/or phosphonic acid groups and/or salts and/or esters thereof; (C) 5 to 70% by weight of at least one monoethylenically unsaturated monomer which comprises at least one COOH group and/or salts thereof; and (D) 0 to 30% by weight of further ethylenically unsaturated monomers differing from (A), (B), and (C).