Epoxy silane oligomer and coating composition containing same
First Claim
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1. A waterborne composition which comprises:
- i) a water soluble epoxy silane oligomer composition containing from 7.46 to 23.5 weight percent residual monomer, wherein the epoxy silane oligomer is produced by the reaction of glycidoxy silane having 3 alkoxy groups with water, wherein the molar ratio of water to silane monomer is from 0.1 to 1.5, in the presence of a catalyst, wherein said water is continuously fed during the reaction and the by-product alcohol is continuously removed during the reaction;
ii) at least one particulate metal selected from the group consisting of aluminum, manganese, cadmium, nickel, tin, magnesium, zinc, alloys thereof and ferroalloys thereof; and
,iii) one or more optional ingredients selected from the group consisting of a surfactant, pH adjusting agent, co-solvent, monomeric silane, binder, crosslinker and pigment paste dispersion.
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Abstract
A process for producing an epoxy silane oligomer including a reaction glycidoxy silane and/or cycloaliphatic epoxy silane having 2 or 3 alkoxy groups and, optionally, a copolymerizable silane other than glycidoxy and cycloaliphatic epoxy silane, with less than 1.5 equivalents of water in the presence of a catalyst, wherein said water is continuously fed during the reaction.
28 Citations
20 Claims
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1. A waterborne composition which comprises:
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i) a water soluble epoxy silane oligomer composition containing from 7.46 to 23.5 weight percent residual monomer, wherein the epoxy silane oligomer is produced by the reaction of glycidoxy silane having 3 alkoxy groups with water, wherein the molar ratio of water to silane monomer is from 0.1 to 1.5, in the presence of a catalyst, wherein said water is continuously fed during the reaction and the by-product alcohol is continuously removed during the reaction; ii) at least one particulate metal selected from the group consisting of aluminum, manganese, cadmium, nickel, tin, magnesium, zinc, alloys thereof and ferroalloys thereof; and
,iii) one or more optional ingredients selected from the group consisting of a surfactant, pH adjusting agent, co-solvent, monomeric silane, binder, crosslinker and pigment paste dispersion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A waterborne composition which comprises:
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i) an epoxy silane oligomer, composition containing from 15 to 23.5 weight percent residual monomer, wherein the epoxy silane oligomer is produced by the reaction of glycidoxy silane and/or cycloaliphatic epoxy silane having 3 alkoxy groups with water wherein the ratio of water to silane monomer is from 0.1 to 1.5 in the presence of a catalyst, wherein said water is continuously fed during the reaction and wherein the epoxy silane oligomer composition is pre- solubilized in an aqueous solution; and
,ii) one or more optional ingredients selected from the group consisting of a surfactant, pH adjusting agent, co-solvent, monomeric silane, binder, crosslinker and pigment paste dispersion, and, iii) at least one particulate metal selected from the group consisting of zinc chromate, zinc potassium chromate, zinc phosphates, alumino triphosphates, calcium magnesium phosphates, barium phosphates, aluminum zinc phosphates, molybdates, wolframates, zirconates, vanadates, zinc salts of 5-nitrophthalic acid and iron phosphide. - View Dependent Claims (19, 20)
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Specification