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US 4,966,634 AGranted
Composition of the surface treatment for metal and the treatment method
AssigneeNihon Parkerizing Co., Ltd.
InventorsKenshi Saeki, Iwao Kawasaki, Yoshikazu Shikaze, Mamoru Sugaya
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Abstract
A treating composition for metallic surfaces is characterized by containing hexavalent chromium ions or hexavalent and trivalent chromium ions as inorganic compound, and acrylic-series polymer emulsion obtained by emulsion-polymerizing, by means of a nonionic emulsifying agent which is essentially free of anionic emulsifying agent and cationic emulsifying agent and which contains a polyoxyethylene-polyoxypropylene block polymer, and having a pH of 5 or less.
Claims13
A composition for treating metallic surfaces, said composition having a pH of 5 or less and comprising
- (a) hexavalent chromium ions or hexavalent and trivalent chromium ions, and
- (b) an emulsion of an acrylate polymer obtained by emulsion-polymerization of a mixture of monomers in the presence of an emulsifying agent consisting essentially of a nonionic emulsifying agent essentially free of anionic and cationic emulsifying agents comprising a polyoxyethylene-polyoxypropylene block copolymer, said mixture of monomers comprising:
- (1) an ethylenically unsaturated carboxylic acid,
- (2) at least one of N-methylol acrylamide, N-methylol methacrylamide, N-butoxy methylacrylamide, N-butoxy methyl-methacrylamide, a phospho-oxyalkyl(meth)acrylate, or an alkoxyalkyl(meth)acrylate, and
- (3) a(meth)acrylate monomer.
2 more elements
Dependencies are inferred from the claim text.