Pressure sensitive adhesive composition

Claim 1

In a pressure-sensitive adhesive composition which when dry forms a tacky adhesive of high cohesive strength, said composition being formed from an organic solvent solution of (A) an acrylic interpolymer made from (1) about 0.5 to about 20 weight percent of a polymerizable monoethylenically unsaturated carboxylic acid, (2) at least one monomer selected from the group consisting of alkyl esters of acrylic acid or methacrylic acid wherein the alkyl group contains 4 to 18 carbon atoms or dialkyl esters of maleic or fumaric acid wherein each alkyl group contains 4 to 18 carbon atoms and (3) optionally, another monomer copolymerizable therewith, wherein the interpolymer has a weight average molecular weight in the range of 10,000 to 500,000 and a glass transition temperature in the range of 0° C. to -75° C., and (B) a chelate ester of orthotitanic acid having the formula ##STR4## wherein n is an integer of 2 or 3, R 1 is C 2 to C 10 alkyl, alkenyl, substituted alkyl or substituted alkenyl group, R 2 is C 1 to C 6 alkyl, alkoxy, alkenyl, or alkenoxy group, R 3 is a C 1 to C 6 alkyl or alkenyl group or a C 6 to C 10 aryl group, and R 4 is hydrogen or a C 1 to C 6 alkyl or alkenyl group, and R 2 and R 3 may be combined as an ethylene or trimethylene group; the improvement which comprises the addition to said adhesive composition of a tertiary amine in the amount of about 0.01 to about 1.5 equivalents of amine per each carboxylic acid equivalent in the interpolymer.