Illustrative of such monomers are the following: ##STR2## A particularly desirable ethylenically unsaturated-functional monomer is an acrylic-type monomer having the following structure: ##STR3## wherein R' and R, individually, are hydrogen, alkyl of 1 to about 4 carbon atoms, monocyclic aryl, such as phenyl, alkyl phenyl where the alkyl is 1 to about 3 carbon atoms, cyclohexyl, and the like; R2