One class of monomers suited for use in this invention comprises acrylate esters having the following general formula: ##STR2## wherein R4 represents a radical selected from the group consisting of hydrogen, halogen, alkyl of 1-4 carbon atoms, inclusive, hydroxyalkyl of 1-4 carbon atoms inclusive, phenyl, and ##STR3## R3 is a radical selected from the group consisting of hydrogen, halogen, and low