Silicone resin coating composition

Claim 2

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) 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 3 Si(OH) 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.

Claim 3

A solid substrate having at least one surface coated with the aqueous coating composition as defined in claim 1 wherein said polysiloxane polyether copolymer has the structural formula: ##STR4## 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.

Claim 4

An article as defined in claim 2 wherein the solid substrate is comprised of a synthetic organic polymer.

Claim 5

An article as defined in claim 2 wherein said solid substrate is a metal.

Claim 6

An article as defined in claim 2 wherein said solid substrate is a synthetic organic polymer having a metallized surface.

Claim 7

An article as defined in claim 3 wherein the polymeric substrate is transparent.

Claim 8

An article as defined in claim 3 wherein said polymer is a polycarbonate.

Claim 9

An article as defined in claim 7 wherein said polycarbonate is transparent.

Claim 10

An article as defined in claim 7 wherein said polycarbonate is a transparent poly(bisphenol-A carbonate).

Claim 11

An article as defined in claim 1 wherein the aqueous coating composition has been cured on said surface of said solid substrate.

Claim 12

An article as defined in claim 2 wherein the aqueous coating composition has been cured on said surface of said solid substrate.

Claim 13

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) 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 3 SI(OH) 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.

Claim 14

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) 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 3 SI(OH) 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.

Claim 15

A solid substrate as defined in claim 12 wherein, in said composition, R is methyl, R' is methyl, R" is butyl, a is 4, b is 3, n is 2.4 and x is 28.5.

Claim 16

A solid substrate as defined in claim 12 wherein, in said composition, said lower aliphatic alcohol is a mixture of methanol and isobutanol.

Claim 17

A solid substrate as defined in claim 12 wherein, in said composition, said partial condensate is of CH 3 SI(OH) 3 .