Patent ID: 6248181
Filing Date: 2001-06-19
Classification: C09D,C23C,F28F

Abstract:
A composition comprising components (P1), (A), (B) and (C) for hydrophilic treatment of an aluminum or aluminum alloy wherein:(P1) a water-soluble polymer obtained by a polymerization process selected from the group consisting of:(i) homopolymerizing a monomer (I) represented by the formula: ##STR7##wherein R.sup.1 represents a hydrogen atom or a methyl group and R.sup.2 and R.sup.3 are the same or different, and each represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, a benzyl group or a hydroxyalkyl group having 2 or 3 carbon atoms,(ii) copolymerizing two or more of monomers (I),(iii) copolymerizing at least one monomer (I) with another monomer (II) copolymerizable with the monomer (I) or salt(s) of the monomer(s) (II) to provide a ratio of monomer (I) in the total monomers of 40% by mol or more, and(iv) subjecting the homopolymer or copolymer resulting from polymerization (i), (ii) or (iii) to a modification process selected from the group consisting of(1) converting amido groups to carboxyl groups by hydrolysis,(2) converting amido groups to amino groups by a Hofmann rearrangement,(3) converting amido groups to --CONH--CH.sub.2 --N(R.sup.4)(R.sup.5) by a Mannich reaction using HN(R.sup.4)(R.sup.5) and formaldehydewherein R.sup.4 and R.sup.5 are the same or different, and each represents an alkyl group having 1 to 4 carbon atoms, a hydroxyalkyl group having 2 or 3 carbon atoms or a benzyl group,(4) introducing a --CONH--R.sup.6 --NH.sub.2 group by reacting side chain ester groups with alkylenediamine (H.sub.2 N--R.sup.6 --NH.sub.2) wherein R.sup.6 represents an alkylene group having 2 to 6 carbon atoms, and(5) converting the amino or substituted amino groups resulting from reactions (2) to (4) to quaternary ammonium through alkylation,(A) a water-soluble trivalent chromium compound;(B) a water-soluble zirconium compound or titanium compound; and(C) water;provided that the ratio of (P1), (A) and (B) is such that, based on 100 weight parts of the solids of (P1), (A) is 0.01 to 70 weight parts and (B) is 0.001 to 70 weight parts and provided the composition is substantially completely free of a hexavalent chromium compound.