Patent ID: 9512331
Filing Date: 2016-12-06
CPC Classification: C08G,C08K,C09D,C23C,Y10T

Claim Text:
1. A surface treatment agent for a zinc or zinc alloy coated steel sheet, comprising: (A) resin compound having a bisphenol skeleton represented by general formula (I) below; (B) cationic urethane resin emulsion having at least one type of cationic functional group selected from primary amine, secondary amine, tertiary amine or quaternary ammonium salt; (C) at least one type of silane coupling agent having at least one type of reactive functional group selected from active hydrogen-containing amino group, epoxy group, mercapto group armor methacryloxy group; (D) organic titanium chelate compound; (E) quadrivalent vanadyl compound; (F) molybdic acid compound; and (G) water, such that conditions (1) to (5) below are satisfied, pH of the surface treatment agent being in the range of 4 to 5, wherein: (1) [(B (2) [(C (3) {(C (4) {(E (5) [(F in formula (I), Y 1 and Y 2 bonded to benzene rings, respectively, are each independently hydrogen or group z represented by general formula (II) or (III) below, the average substitution number of the group z per benzene ring is in the range of 0.2 to 1.0, and n represents integer in the range of 2 to 50: in formula (II) and formula (III), R 1 , R 2 , R 3 , R 4 and R 5 each independently represent hydrogen atom, C 1-10 alkyl group or C 1-10 hydroxyalkyl group, and A − represents hydroxyl ion or acid ion.