| http://www.w3.org/ns/prov#value | - The term acrylic-type for the copolymer and for at least one type of monomer used in preparing the copolymer refers to acrylic monomers having the formula: ##STR2## wherein X is a hydrogen atom or a methyl or other lower alkyl group and Y is selected from one of the following groups: --COOH; --COOR; --COOROH wherein in both instances R represents a hydrocarbon radical and/or hydroxymethyl and/or
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