Silicone resin coating composition with improved shelf life
AssigneeGeneral Electric Company
InventorsWilliam J. O'Malley, Howard A. Vaughn, Jr.
Life of this patent
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Abstract
A silicone resin coating composition with improved shelf life is disclosed herein. A coating composition having a basic pH in the range of from 7.1-7.8 and prepared by hydrolyzing an alkyltrialkoxysilane or aryltrialkoxysilane in an aqueous colloidal silica dispersion is diluted to 10-15% solids. A compatible thickening agent is then added.
Claims29
An aqueous coating composition having improved room temperature shelf life comprising a dispersion of colloidal silica in an aliphatic alcohol-water solution of the partial condensate of a silanol of the formula RSi(OH).sub.3, wherein R is selected from the group consisting of alkyl having from 1 to 3 carbon atoms and aryl, at least 70 weight percent of the silanol being CH.sub.3 Si(OH).sub.3, said composition adjusted to 10 to 15 weight percent solids consisting essentially of 10 to 70 weight percent colloidal silica and 30 to 90 weight percent of the partial condensate by dilution with an aliphatic alcohol or mixture of alcohols, said composition further containing from about 75 to about 750 ppm by weight of a thickening agent, said composition having a pH of 7.1 to about 7.8.
An aqueous coating composition having improved room temperature shelf life prepared by admixing an aqueous colloidal silica dispersion with a solution of an alkyltriacetoxysilane in an alkyltrialkoxysilane, maintaining the temperature of the admixture at from about 20.degree. C. to about 30.degree. C. for a sufficient time to reduce the reaction mixture to one liquid phase, maintaining the pH of the composition in the range of from about 7.1 to about 7.8, adjusting the solids content of the reaction mixture to about 10 to 15 weight percent by the addition of an aliphatic alcohol thereto, and thereafter adding from about 75 to about 750 ppm by weight of a thickening agent to the admixture.
An aqueous coating composition having improved room temperature shelf life prepared by admixing an aqueous colloidal silica dispersion with a solution of acetic acid in an alkyltrialkoxysilane, maintaining the temperature of the admixture at from about 20.degree. C. to about 30.degree. C. for a sufficient time to reduce the reaction mixture to one liquid phase, maintaining the pH of the composition in the range of from about 7.1 to about 7.8, adjusting the solids content of the reaction mixture to about 10 to 15 weight percent by the addition of an aliphatic alcohol thereto, and thereafter adding from about 75 to about 750 ppm by weight of a thickening agent to the admixture.
Dependencies are inferred from the claim text.