A 1,6-diazaspiro[4,4]nonane-2,7-dione derivative having theformula X-[-B-Y-(P-Y)-p]m-B-X, in which B is a divalent radical offormula (I), (I)wherein R independently is hydrogen or a C1-4 alkyl, A is asubstituent replacing hydrogen selected independently from a C1-4alkyl or halogen atom, and n independently is 0, 1 or 2; m ? 0;each X independently is hydrogen or a glycidyl group; Y is 2-hydroxy-1,3-propadiyl; each P independently is a divalent radicalderived from a dihydric aromatic alcohol; and p is on average offrom 0 to 3. The derivatives are useful for the preparation ofpolyhydric polyethers characterized by high glass transitiontemperatures, typically above 150°C. These polymers are useful,for example, for engineering applications, such as mouldedcontainers for food and drink which are frequently exposed toelevated temperatures.
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