. . . . "The monovinylidene aromatic monomers utilized are generically described by the following formula (VI): wherein each R1 is independently H, (C1-C6)alkyl, cycloalkyl, aryl, alkaryl, aralkyl, alkoxy, aryloxy, or halo, such as, for example, such as bromine and chlorine, and R2 is selected from the group consisting of H, (C1-C6)alkyl and halo." .