| http://www.w3.org/ns/prov#value | - Preferred polyfunctional acrylic monomers are those of the formula: ##STR9## wherein each R1 is independently selected from the group consisting of a hydrogen atom and an alkyl group of 1 to 2 carbon atoms, and each R2 is independently selected from the group consisting of an alkyl group of 1 to 6 carbon atoms and a radical of the formula: ##STR10## in which R3 is a hydrogen atom or an alkyl group
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