Low VOC epoxy silane oligomer and compositions containing same
AssigneeMomentive Performance Materials Inc.
InventorsAlain Lejeune, Yves Gentil
Life of this patent
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Abstract
A process for producing a low VOC epoxy silane oligomer which includes the reaction of an epoxy silane with water in a water to silane molar ratio of from 0.1 to 1.5, in which the epoxy silane is the reaction product of an epoxy alkoxy-substituted silane and a diol or a dicarboxylic acid.
Claims51
A process for producing an epoxy silane oligomer which comprises reacting an epoxy silane with water in a molar ratio of water to epoxy silane of from 0.1 to 1.5, wherein the epoxy silane is produced by reacting at least one epoxy alkoxy-substituted silane monomer and, optionally, a copolymerizable alkoxy-substituted silane other than glycidoxy and cycloaliphatic epoxy silane having two or three alkoxy groups, with a diol or dicarboxylic acid.
A waterborne composition which comprises:
- i) at least one epoxy silane oligomer, wherein the epoxy silane oligomer is produced by the hydrolysis of at least one epoxy alkoxy substituted silane monomer with a diol or a dicarboxylic acid, the epoxy silane upon hydrolysis of its hydrolyzable sites producing are reduced amount of volatile organic compound compared to that produced by the hydrolysis of a silane possessing an equivalent number of hydrolyzable sites all of which are hydrolyzable alkoxy groups, the hydrolyzing of the epoxy silane being carried out with less than 1.5 equivalents of water, said water being continuously fed during the hydrolysis reaction;
- and,
- ii) one or more optional ingredients selected from the group consisting of a copolymerizable alkoxy-substituted silane other than glycidoxy and cycloaliphatic epoxy silane having two or three alkoxy groups, a surfactant, pH adjusting agent, co-solvent, monomeric silane, binder, crosslinker and pigment paste dispersion.
The waterborne composition of 39 wherein the particulate metal is 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-nitrophtalic acid and iron phosphide.
Dependencies are inferred from the claim text.