wherein in Formula IV, Y is an organofunctional group selected from the group consisting of ##STR2## X is a silicon-functional group selected from the group consisting of --Cl, --OCH3, --OC2 H5 and --OC2 H4 OCH3 ; and n is a number in the range of 1 to about 100, preferably 1 to about 50, more preferably 1 to about 30.