Silicone resin coating composition
AssigneeGeneral Electric Company
InventorRobert B. Frye
Life of this patent
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Abstract
An improved silicone resin coating composition is provided, the composition comprising a dispersion of colloidal silica in an aliphatic alcohol-water solution of the partial condensate of a silanol with a small amount of a polysiloxane polyether copolymer added thereto.
Claims15
A solid substrate having at least one surface coated with an improved aqueous coating composition comprising a dispersion of colloidal silica in a lower 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 containing 10 to 50 weight percent solids, said solids consisting essentially of 10 to 70 weight percent colloidal silica and 30 to 90 weight percent of the partial condensate, said composition having a pH of from 7.1 to about 7.8, the improvement comprising the intimate admixture of a small amount effective to control flow of a polysiloxane polyether copolymer with said composition.
A solid substrate having at least one surface coated with an improved aqueous coating composition comprising a dispersion of colloidal silica having a particle size of from 5 to 150 millimicrons in diameter in a lower 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 phenyl, at least 70 weight percent of the silanol being CH.sub.3 SI(OH).sub.3, said composition containing 10 to 50 weight percent solids, said solids consisting essentially of 10 to 70 weight percent colloidal silica and 30 to 90 weight percent of the partial condensate, said composition having a pH of from 7.1 to about 7.8, the improvement comprising the intimate admixture with said composition of from about 2.5 to about 15% by weight, of the total solids of the composition, of a polysiloxane polyether copolymer having the structural formula:
- ##STR5## wherein R and R' are monovalent hydrocarbon radicals;
- R" is a lower alkyl radical, a has a value of at least 2;
- b has a value of from 2 to 3, inclusive, n has a value of from 2 to 4, inclusive and x has a value of at least 5.
Dependencies are inferred from the claim text.