| http://www.w3.org/ns/prov#value | - Styrenes that may be used in combination with the acrylic monomers may be characterized by the formula: ##STR3## wherein R is hydrogen or an alkyl group of 1 to 4 carbon atoms, e.g. tertiarybutyl styrene and may be present in amounts ranging from about 0% to 70% and preferably in amounts ranging from 5 to 30 parts by weight of the total mixture of acrylic monomers.
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