Use of hydroxy substituted urones as cure accelerators

An accelerator for the curing of resins comprising a urone compound containing at least 2 orthohydroxyphenyl urea according selected from one or more compounds of the following formulae

• where R is a divalent or multivalent linear or branched aliphatic hydrocarbon radical (substituted or unsubstituted), a divalent or multivalent hetero interrupted aliphatic hydrocarbon radical (substituted or unsubstituted), a divalent or multivalent aromatic hydrocarbon interrupted aliphatic hydrocarbon radical (substituted or unsubstituted);
• where R1 is at each occurrence, independently of one or another, selected from H, linear or branched monovalent aliphatic radical (substituted or unsubstituted), or an unsubstituted, halo substituted and/or alkyl substituted monovalent aromatic radical;
• where both R2 groups together forms a divalent or multivalent organic cycloaliphatic hydrocarbon radical (substituted or unsubstituted), a divalent or multivalent hetero interrupted cycloaliphatic hydrocarbon radical (substituted or unsubstituted), a divalent or multivalent aromatic hydrocarbon interrupted cycloaliphatic hydrocarbon radical (substituted or unsubstituted);
• where Y is S, SO2, SO, PR2, NR2, P═O(OX or OH), C═O, a linear or branched aliphatic radical (substituted or unsubstituted), or an unsubstituted, halo substituted and/or alkyl substituted aromatic radical;
• where n is at least 2;
• and
• where X is at each occurrence, independently of one or another, selected from H, OH, NH2, NO2, nitrile, a halogen, a substituted or unsubstituted linear or branched aliphatic radical, and a substituted or unsubstituted aromatic radical.