Silicone adhesive compositions with improved quick stick

Claim 1

A curable adhesive composition consisting essentially of the reaction mixture of: (A) about 45 to about 75 percent of a solid, benzene-soluble, resin copolymer consisting primarily of R 5 3 SiO 1/2 and SiO 4/2 units and up to 5 molar percent of R 5 2 SiO 2/2 and R 5 SiO 3/2 units, wherein each R 5 individually is a hydrocarbon radical containing no more than six carbon atoms, there being from 0.6 to 0.9 inclusive R 5 3 SiO 1/2 units for every SiO4/2 units, the resin comprises from about 0.2% to about 5.0% by weight, based on the total solids resin weight, of hydrozy radicals, and (B) about 25 to about 55 percent of a silicone polymer having the formula ##STR2## wherein each R" is independently selected from the group consisting of alkyl, alkenyl, phenyl, aryl and arylalkyl, R'" is R", R' is either hydroxy or R", wherein the sum x+y is a number sufficient to give silicone gum having a viscosity from 800,000 cps to 200,000,000 cps and the total solids weight of (A) and (B) being 100 parts, and (C) about 2 to about 30 parts by weight of a silicone fluid, based on the total weight of (A) and (B) being 100 parts, wherein said fluid is capable of reacting with silanol groups, said silicone fluid has the following formula: (1) R 1 R 2 2 Si(OSiR 2 2 ) m (OSiR 3 R 4 ) n OSiR 1 2 R 2 or (2) copolymers comprising R 1 R 2 2 SiO 1/2 , R 2 2 SiO 2 2 , R 3 R 4 SiO 2/2 , or R 1 SiO 3/2 units, wherein each R 2 independently is an alkyl, aryl, or arylalkyl group having up to 10 carbon atoms; and wherein R 1 , R 3 , R 4 each having up to 10 carbon atoms and independently selected from alkyl, aryl, arylkyl, alkaryl, hydroxy, hydroxyalkyl, alkoxy, allyl, hydrogen, epoxide-containing aliphatic, epoxide-containing cycloaliphatic, epoxide-containing aromatic, amine, aminocarboxy, fluorinated alkyl, fluorinated alkenyl or fluorinated aryl, and wherein the sum n+m is such that the viscosity of the fluid is up to about 100,000 cps at 25° C. whereby peel adhesion measured by ASTM test D-3330 is improved.