Silicone release coating and lubricating compositions and methods
AssigneeToshiba Silicones Ltd.
InventorsKazo Maruyama, Shuhei Kosaka, Akitsugu Kurita
Life of this patent
Estimating the term…
Abstract
A silicone base release or lubricating agent is disclosed which is comprised of the reaction product of a silanol-containing polydiorganosiloxane fluid with a first reaction product of epoxy or glycidoxy functional silanes and aminofunctional silanes.
Claims7
A method of imparting a release or lubricating property to a surface of a substrate, which comprises the steps of coating on the surface of the substrate a composition comprising a reaction product of (1) 80 to 99.9% by weight of a polydiorganosiloxane having a viscosity of20 to 1,000,000 centistokes as measured at 25.degree. C. and containing therein at least one silanol group per molecule with (2) 0.1 to 20% by weight of a reaction product of (A) an amino group-containing silane represented by the general formula:
- ##STR5## wherein Q.sup.1 represents a monovalent group selected from the group consisting of hydrogen atom, --CH.sub.3, --CH.sub.2 CH.sub.2,NH.sub.2 and --CH.sub.2 CH.sub.2 NHCH.sub.2 CH.sub.2 NH.sub.2, R.sup.1 represents a divalent hydrocarbon group having 1 to 4 carbon atoms, R.sup.2 and R.sup.3 stand for a monovalent hydrocarbon group having 1 to 4 carbon atoms, and a is 0 or 1, with (B) an epoxy group-containing silane represented by the following general formula:
- ##STR6## wherein Q.sup.2 represents an epoxy group-containing group selected from the group consisting of glycidoxyl and epoxycyclohexyl groups, R.sup.4 represents a divalent hydrocarbon group having 2 to 4 carbon atoms, R.sup.5 and R.sup.6 stand for a monovalent hydrocarbon group having 1 to 4 carbon atoms, and b is 0 or 1 wherein said reaction product is diluted with inert solvent to provide a silicone content of less than 10% by weight, coating a film on the surface of the substrate;
- and curing said film thereby imparting a release or lubricating property to the surface of the substrate.
A silicone releasing or lubricating composition comprising a reaction product of (1) 80 to 99.9% by weight of a polydiorganosiloxane having a viscosity of 20 to 1,000,000 centistokes as measured at 25.degree. C. and containing at least one silanol group per molecule with (2) 0.1 to 20% by weight of a reaction product of (A) an amino group-containing silane represented by the following general formula:
- ##STR7## wherein Q.sup.1 represents a monovalent group selected from the group consisting of hydrogen atom, --CH.sub.3, --CH.sub.2 CH.sub.2 NH.sub.2 and --CH.sub.2 CH.sub.2 NHCH.sub.2 CH.sub.2 NH.sub.2, R.sup.1 represents a divalent hydrocarbon group having 1 to 4 carbon atoms, R.sup.2 and R.sup.3 represent a monovalent hydrocarbon group having 1 to 4 carbon atoms, and a is 0 or 1, with (B) an epoxy group-containing silane represented by the following general formula:
- ##STR8## wherein Q.sup.2 represents an epoxy group-containing group selected from the group consisting of glycidoxyl and epoxycyclohexyl groups, R.sup.4 represents a divalent hydrocarbon group having 2 to 4 carbon atoms, R.sup.5 and R.sup.6 represents a monovalent hydrocarbon group having 1 to 4 carbon atoms, and b is 0 or 1.
Dependencies are inferred from the claim text.