A 1,6-diazaspiro[4,4]nonane-2,7-dione derivative having the formula I: X @B-Y@P-Y @@@@B-X (I) in which B has the formula II: CHEM wherein a) Z1, Z2, Z3, Z4 are independently - C(Z min )2 in which Z min independently is hydrogen or C1-4 alkyl, or - such that two adjacent Z atoms form part of a benzene ring; b) each R is independently a bivalent group of the formula III or IV: CHEM wherein A is a substituent replacing hydrogen selected independently from a C1-4 alkyl or halogen atom, n independently is 0, 1 or 2 and the free valence bond of C* is linked with a ring nitrogen atom of the spirodilactam of the formula II; c) m /= 0; d) each X independently is hydrogen or a glycidyl-, acrylyl-, methacrylyl-, allyl- or propargyl group, with the proviso that when X is acrylyl, methacrylyl, allyl or propargyl then m is 0; e) Y is 2-hydroxy-1,3-propadiyl; f) each P independently is a divalent radical derived from a dihydric aromatic alcohol; g) p is on average of from 0 to 3; with the proviso that when R is a bivalent group of the formula III and simultaneously Z2 and Z3 are each CH2 and simultaneously Z1 and Z4 are each independently hydrogen or a C1-4 alkyl, then each X is not hydrogen or glycidyl.
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