Moisture-curable hot melt silicone pressure-sensitive adhesives

A moisture-curable silicone hot melt pressure-sensitive adhesive composition comprising

• (A) an organopolysiloxane resin comprising R.sub.3 SiO.sub.1/2 siloxane units bonded to the SiO.sub.4/2 siloxane units wherein R is selected from the group consisting of hydrocarbon radicals and halogenated hydrocarbon radicals:
• and curing radicals of the formula --SiY.sub.2 ZNY'ZSiR.sup.1.sub.x Y".sub.3-x wherein R.sup.1 is a monovalent hydrocarbon radical;
• each Z is a divalent linking group;
• each Y is independently selected from the group consisting of a monovalent organic radical, an enoloxy radical, an alkoxy radical, and an oximo radical;
• Y' is selected from the group consisting of a monovalent organic radical, a hydrogen atom, and --ZSiR.sup.1.sub.x Y".sub.3-x ;
• Y" is selected from the group consisting of an enoloxy radical, an alkoxy radical, and an oximo radical;
• and subscript x has a value of 0 or 1;
• and
• (B) a diorganopolysiloxane polymer, each terminal group thereof containing at least one silicon-bonded hydrolyzable functional radicals selected from the group consisting of alkoxy radicals having 1 to 4 carbon atoms, ketoxime radicals, enoloxy radicals, aminoxy radicals, acetamido radicals, N-methylacetamido radicals and acetoxy radicals;
• said polymer having a viscosity at 25.degree. C. of 20 to <100,000 mm.sup.2 /s and the weight ratio of said resin to said polymer being in the range 55:45 to 70:30;
• said composition being essentially solvent-free non-slump solid at room temperature which cures to an elastomer upon exposure to moisture.

An organopolysiloxane resin comprising curing radicals of the formula

• (A) an organopolysiloxane resin comprising R.sub.3 SiO.sub.1/2 siloxane units bonded to the SiO.sub.4/2 siloxane units wherein R is selected from the group consisting of hydrocarbon radicals and halogenated hydrocarbon radicals;
• and curing radicals of the formula --SiY.sub.2 ZNY'ZSiR.sup.1.sub.x Y".sub.3-x wherein R.sup.1 is a monovalent hydrocarbon radical;
• each Z is a divalent linking group;
• each Y is independently selected from the group consisting of a monovalent organic radical, an enoloxy radical, an alkoxy radical, and an oximo radical;
• Y' is selected from the group consisting of a monovalent organic radical, a hydrogen atom, and --ZSiR.sup.1.sub.x Y".sub.3-x ;
• Y" is selected from the group consisting of an enoloxy radical, an alkoxy radical, and an oximo radical;
• and the subscript x has a value of 0 or 1.

A method for producing moisture curing pressure sensitive adhesive compositions wherein said method comprises

• (I) reacting an amine functional resin comprising R.sub.3 SiO.sub.1/2 siloxane units, SiO.sub.4/2 siloxane units and O.sub.3/2 SiOSiY.sub.2 ZNHY"' siloxane units;
• wherein the mole ratio of the R.sub.3 SiO.sub.1/2 siloxane units to SiO.sub.4/2 has a value of from 0.5/1 to 1.2/1;
• with (ii) an epoxy compound having the formula Z'SiR.sup.1.sub.x Y".sub.3-x ;
• wherein R is selected from the group consisting of hydrocarbon radicals and halogenated hydrocarbon radicals, wherein R.sup.1 is a monovalent hydrocarbon radical;
• each Z is a divalent linking groups;
• each Y is independently selected from the group consisting of a monovalent organic radical, an enoloxy radical, an alkoxy radical, and an oximo radical;
• Y' is selected from the group consisting of a monovalent organic radical, a hydrogen atom, and --ZSiR.sup.1.sub.x Y".sub.3-x ;
• Y" is selected from the group consisting of an enoloxy radical, an alkoxy radical, and an oximo radical;
• Y"' is selected from the group consisting of a monovalent organic group and a hydrogen atom;
• Z' is an organic group composed of carbon, hydrogen and oxygen having therein at least one oxirane group and the subscript x has a value of 0 or 1;
• (II) combining the reaction product of (I) with a diorganopolysiloxane polymer, each terminal group thereof containing at least one silicon-bonded hydrolyzable functional radicals selected from the group consisting of alkoxy radicals having 1 to 4 carbon atoms, ketoxime radicals, enoloxy radicals, aminoxy radicals, acetamido radicals, N-methylacetamido radicals and acetoxy radicals;
• the weight ratio of the reaction product of (I) to the diorganopolysiloxane polymer being in the range of 5:95 to 90:10.