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Fremgangsmåde til fremstilling af additionspolymere af umættede dicarboxylsyremonoestere af N-(hydroxyalkyl)- eller N-(hydroxylalkyl-oxyalkyl)-1,3-cyclodiazolidin-2-oner.
Fremgangsmåde til fremstilling af højmolekylære polyoxymethylener eller deres acylerings- eller alkyleringsprodukter ved polymerisation af monomert formaldehyd i opløsningsmidler og i nærværelse af katalysatorer.