Silicone-containing block copolymers and macromonomers

An acrylic block copolymer comprised of:

• (a) 10-90% by weight of one end block derived from one or more monomers having the formula ##STR4## and mixtures thereof wherein:
• X is --CN, --CH.dbd.CHC(O)X' or --C(O)X';
• Y is --H, --CH.sub.3, --CN or --CO.sub.2 R, provided, however, when X is --CH.dbd.CHC(O)X', Y is --H or --CH.sub.3 ;
• X' is --OSi(R).sub.3, --R, --OR or --NR'R";
• each R is independently selected from C.sub.1-20 alkyl, alkenyl, or alkadienyl or C.sub.6-20 cycloalkyl, aryl, alkaryl or aralkyl, any of said groups optionally containing one or more ether oxygen atoms within aliphatic segments thereof and optionally containing one or more functional substituents that are unreactive under polymerizing conditions;
• and each of R' and R" is independently selected from C.sub.1-4 alkyl;
• and
• (b) 90-10% by weight of another end block derived from one or more polysiloxanylalkyl esters having the formula ##STR5## where D and E are selected from the group consisting of C.sub.1 -C.sub.5 alkyl groups, phenyl groups, and groups of the structure ##STR6## where A is selected from the group consisting of C.sub.1 -C.sub.5 alkyl groups and phenyl groups;
• m is an integer from one to five;
• and n is an integer from one to three;
• R.sub.2 is --H or --CH.sub.3 ;
• and
• (c) having attached to only one of said end blocks of each molecule a terminal organo group containing a polymerizable carbon-carbon double bond.