Aqueous dispersion for metal coating from colloidal silica, alkoxy silane, and polymer
First Claim
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1. A composition for surface treatment of metals which comprises an aqueous dispersion of a silica-organic polymer complex which is the reaction product of ingredients consisting essentially of colloidal silica wherein the silica is of 7 to 100 mμ
- particle size, water soluble or water dispersible organic polymer having both hydroxyl and carboxyl groups and an acid value of 20-200 selected from the group consisting of acrylic copolymer resin, alkyd resin, epoxyester resin and polybutadiene resin, the compounding ratio on a solids basis of said colloidal silica and said organic polymer being in the range of 5;
95 to 95;
5 by weight, and 0.5-15% by weight based on the solid weight of said colloidal silica and said organic polymer of silane compound selected from the group consisting of divinyl dimethoxy silane, divinyl di-β
-methoxyethoxy silane, di(γ
-glycidoxy propyl)dimethoxy silane, vinyl triethoxy silane, vinyl tris-β
-methoxyethoxy silane, γ
-glycidoxy propyl trimethoxy silane, γ
-methacryloxypropyl trimethoxy silane, β
-(3,4-epoxycyclohexyl)ethyl trimethoxy silane, N-β
-aminoethyl-γ
-propylmethyl dimethoxy silane, N-β
-aminoethyl-γ
-propyl trimethoxy silane, and γ
-aminopropyl triethoxy silane.
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Abstract
A silica complex composition suitable for the surface treatment of metals is disclosed, which comprises a water dispersible silica, an organic polymer soluble or dispersible in water and a di- or trialkoxy (or alkoxy-alkoxy) silane compound.
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8 Claims
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1. A composition for surface treatment of metals which comprises an aqueous dispersion of a silica-organic polymer complex which is the reaction product of ingredients consisting essentially of colloidal silica wherein the silica is of 7 to 100 mμ
- particle size, water soluble or water dispersible organic polymer having both hydroxyl and carboxyl groups and an acid value of 20-200 selected from the group consisting of acrylic copolymer resin, alkyd resin, epoxyester resin and polybutadiene resin, the compounding ratio on a solids basis of said colloidal silica and said organic polymer being in the range of 5;
95 to 95;
5 by weight, and 0.5-15% by weight based on the solid weight of said colloidal silica and said organic polymer of silane compound selected from the group consisting of divinyl dimethoxy silane, divinyl di-β
-methoxyethoxy silane, di(γ
-glycidoxy propyl)dimethoxy silane, vinyl triethoxy silane, vinyl tris-β
-methoxyethoxy silane, γ
-glycidoxy propyl trimethoxy silane, γ
-methacryloxypropyl trimethoxy silane, β
-(3,4-epoxycyclohexyl)ethyl trimethoxy silane, N-β
-aminoethyl-γ
-propylmethyl dimethoxy silane, N-β
-aminoethyl-γ
-propyl trimethoxy silane, and γ
-aminopropyl triethoxy silane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- particle size, water soluble or water dispersible organic polymer having both hydroxyl and carboxyl groups and an acid value of 20-200 selected from the group consisting of acrylic copolymer resin, alkyd resin, epoxyester resin and polybutadiene resin, the compounding ratio on a solids basis of said colloidal silica and said organic polymer being in the range of 5;
Specification