| http://www.w3.org/ns/prov#value | - nyl radical or a 3,3,3-trifluoropropyl radical, at least 80 mole % of radicals R being methyl radicals, and the symbols Y, which may be identical or different, are each a C1 -C18 straight or branched chain alkylene linkage, with an ester (C) of the formula: ##STR12## in which X is a hydrogen atom or a methyl radical and Z is a C1 -C6 alkyl radical.
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