| http://www.w3.org/ns/prov#value | - Appropriately, anhydrides, acid anhydrides or ester-anhydrides according to the definition, and preferably compounds of the formula IIa, and especially compounds of the formula Ia, wherein R1 represents --OH or an alkoxy group with 1-4 carbon atoms and the two R2 s conjointly represent the --O-- grouping, are used for the polymerisation according to process variant (a).
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