Silicone-modified acrylic copolymer and adhesive thereof

Claim 1

A silicone-modified acrylic copolymer comprising: I. a structural unit of the formula ##STR57## wherein R 1 is a hydrogen atom, a methyl group or an ethyl group, and R 3 is an alkyl group with 1 to 13 carbon atoms or an aryl group with 6 to 14 carbon atoms, II. a structural unit of the formula ##STR58## or of the formula ##STR59## wherein R 2 is a hydrogen atom, a methyl group or an ethyl group, each of R 4 is an alkyl group with 1 to 6 carbon atoms or an aryl group with 6 to 14 carbon atoms which may be the same or different, each of R 5 is a hydrogen atom, an alkyl group with 1 to 6 carbon atoms or an aryl group with 6 to 14 carbon atoms which may be the same or different, A is a divalent organic group with 2 to 20 carbon atoms which may have an ether bond or an ester bond in the main chain, and c and d are average recurring unit numbers, c being a number of 1 to 100 and d being a number of 0 to 100, and III. a structural unit of the formula ##STR60## wherein R 6 is a hydrogen atom, a methyl group or an ethyl group, and R 7 is an ethylenically unsaturated hydrocarbon group with 2 to 20 carbon atoms which may have an ether bond or an ester bond in the main chain, wherein the unit (I), the unit (II) and the unit (III) are contained at ratios in mole % of (I)=10 to 99.9, (II)=90 to 0.1, and (III)=0 to 89.9, and have weight average molecular weights of from 5,000 to 1,000,000.