These monomers are known in the art and have the formula ##STR1## wherein R3 is hydrogen and R4 is a hydrocarbon or substituted hydrocarbon group; a group having the formula --R5 --O--R6 --O--R7, wherein R5 is a 1,2-alkylene group having 2-4 carbon atoms, R6 is an alkylene group having 2-4 carbon atoms, and R7 is an alkyl group having 1-6 carbon atoms; or a group having the formula: ##STR2## where