. " radical is A-- or QR--, each R is a divalent alkylene radical of from 1 to 6 inclusive carbon atoms, each Q is an organofunctional monovalent radical selected from the group consisting of RCOE'--, RE'OC--, NC--, R'E'--, HO--, G2 N--, HO(RO)n --, and G2 NCH2 CH2 NG-- where E' is --O--, --NG-- or --S--, n has a value of from 1 to 6, ##STR1## Z' is selected from the group consisting of HSR--, H" . . .