Silicone-organic coating compositions

Claim 1

A composition consisting essentially of a homogeneous mixture of (I) a liquid silicone resin prepared by (A) forming a homogeneous mixture having an acid number greater than zero and consisting essentially of (a) an organic solvent solution of a resinous copolymeric siloxane containing silicon-bonded hydroxyl radicals and consisting essentially of R 3 SiO 1/2 siloxane units and SiO 4/2 siloxane units wherein the ratio of the number of said R 3 SiO 1/2 siloxane units to the number of said SiO 4/2 siloxane units has a value of from 0.6/1 to 0.9/1 and each R denotes, independently, a monovalent hydrocarbon radical and (b) a liquid organohydrogenpolysiloxane wherein each organic radical is, independently, a monovalent hydrocarbon radical, there being an average of at least one silicon-bonded hydrogen radical per molecule of said organohydrogenpolysiloxane, and (B) heating the homogeneous mixture of (A) to remove substantially all of said organic solvent therefrom, (II) one or more silicon-free, film-forming organic polymers, and (III) a compatibilizing liquid in at least a sufficient amount to render the composition homogeneous; the weight ratio of the amount of component (I) to the amount of component (II) having a value of from 1/99 to 99/1.

Claim 10

A method for preparing a composition consisting essentially of a homogeneous mixture of (I) a liquid silicone resin prepared by (A) forming a homogeneous mixture having an acid number greater than zero and consisting essentially of (a) an organic solvent solution of a resinous copolymeric siloxane containing silicon-bonded hydroxyl radicals and consisting essentially of R 3 SiO 1/2 siloxane units and SiO 4/2 siloxane units wherein the ratio of the number of said R 3 SiO 1/2 siloxane units to the number of said SiO 4/2 siloxane units has a value of from 0.6/1 to 0.9/1 and each R denotes, independently, a monovalent hydrocarbon radical and (b) a liquid organohydrogenpolysiloxane wherein each organic radical is, independently, a monovalent hydrocarbon radical, there being an average of at least one silicon-bonded hydrogen radical per molecule of said organohydrogenpolysiloxane, and (B) heating the homogeneous mixture of (A) to remove substantially all of said organic solvent therefrom, (II) poly(vinyl alcohol) and, optionally, one or more other silicon-free, film-forming organic polymers and (III) water, optionally containing one or more surfactants, in at least a sufficient amount to render the composition homogeneous, the weight ratio of the amount of component (I) to the amount of component (II) having a value of from 1/99 to 99/1; said method comprising (i) emulsifying the (I) liquid silicone resin with an aqueous phase comprising poly(vinyl alcohol) and (ii) mixing with the emulsion of step (i) an aqueous phase comprising any remaining portion of the (II) poly(vinyl alcohol) and any other silicon-free, film-forming organic polymer.

Claim 11

A method for preparing a composition consisting essentially of a homogeneous mixture of (I) a liquid silicone resin prepared by (A) forming a homogeneous mixture having an acid number greater than zero and consisting essentially of (a) an organic solvent solution of a resinous copolymeric siloxane containing silicon-bonded hydroxyl radicals and consisting essentially of R 3 SiO 1/2 siloxane units and SiO 4/2 siloxane units wherein the ratio of the number of said R 3 SiO 1/2 siloxane units to the number of said SiO 4/2 siloxane units has a value of from 0.6/1 to 0.9/1 and each R denotes, independently, a monovalent hydrocarbon radical and (b) a liquid organohydrogenpolysiloxane wherein each organic radical is, independently, a monovalent hydrocarbon radical, there being an average of at least one silicon-bonded hydrogen radical per molecule of said organohydrogenpolysiloxane, and (B) heating the homogeneous mixture of (A) to remove substantially all of said organic solvent therefrom, (II) poly(vinyl alcohol) and, optionally, one or more other silicon-free, film-forming organic polymers and (III) water, optionally containing one or more surfactants, in at least a sufficient amount to render the composition homogeneous, the weight ratio of the amount of component (I) to the amount of component (II) having a value of from 1/99 to 99/1; said method comprising (i) emulsifying the (I) liquid silicone resin with an aqueous phase comprising poly(vinyl alcohol) and (ii) mixing with the emulsion of step (i) an aqueous phase comprising any remaining portion of the (II) poly(vinyl alcohol) and any other silicon-free, film-forming organic polymer.

Claim 16

A method for coating a substrate, said method comprising (1) applying to said substrate a composition consisting essentially of (I) a liquid silicone resin prepared by (A) forming a homogeneous mixture having an acid number greater than zero and consisting essentially of (a) an organic solvent solution of a resinous copolymeric siloxane containing silicon-bonded hydroxyl radicals and consisting essentially of R 3 SiO 1/2 siloxane units and SiO 4/2 siloxane units wherein the ratio of the number of said R 3 SiO 1/2 siloxane units to the number of said SiO 4/2 siloxane units has a value of from 0.6/1 to 0.9/1 and each R denotes, independently, a monovalent hydrocarbon radical and (b) a liquid organohydrogenpolysiloxane wherein each organic radical is, independently, a monovalent hydrocarbon radical, there being an average of at least one silicon-bonded hydrogen radical per molecule of said organohydrogenpolysiloxane, and (B) heating the homogeneous mixture of (A) to remove substantially all of said organic solvent therefrom, (II) one or more silicon-free, film-forming organic polymers, (III) a compatibilizing liquid in at least a sufficient amount to render the composition homogeneous; the weight ratio of the amount of component (I) to the amount of component (II) having a value of from 1/99 to 99/1, and optionally, (IV) a curing catalyst in sufficient amount to improve the curing rate of the coating, and (2) evaporating the compatibilizing liquid from the applied composition.

Claim 17

A method for coating a substrate, said method comprising (1) applying to said substrate a composition consisting essentially of (I) a liquid silicone resin prepared by (A) forming a homogeneous mixture having an acid number greater than zero and consisting essentially of (a) an organic solvent solution of a resinous copolymeric siloxane containing silicon-bonded hydroxyl radicals and consisting essentially of R 3 SiO 1/2 siloxane units and SiO 4/2 siloxane units wherein the ratio of the number of said R 3 SiO 1/2 siloxane units to the number of said SiO 4/2 siloxane units has a value of from 0.6/1 to 0.9/1 and each R denotes, independently, a monovalent hydrocarbon radical and (b) a liquid organohydrogenpolysiloxane wherein each organic radical is, independently, a monovalent hydrocarbon radical, there being an average of at least one silicon-bonded hydrogen radical per molecule of said organohydrogenpolysiloxane, and (B) heating the homogeneous mixture of (A) to remove substantially all of said organic solvent therefrom, (II) one or more silicon-free, film-forming organic polymers, (III) a compatibilizing liquid in at least a sufficient amount to render the composition homogeneous; the weight ratio of the amount of component (I) to the amount of component (II) having a value of from 1/99 to 99/1, and optionally, (IV) a curing catalyst in sufficient amount to improve the curing rate of the coating, and (2) evaporating the compatibilizing liquid from the applied composition.