Patent ID: 9663609
Date: 2017-05-30
CPC Classifications: C08G,C08L

Claim:
1. A method for the controlled curing of epoxy resin compositions comprising (i) providing an epoxy resin composition comprising: wherein R=a linear or branched aliphatic radical, or n =a number from 2 to 20, wherein the epoxy resin composition has a layer thickness of at least 10 mm, and wherein the epoxy resin composition does not comprise any further curing agents, co-curing agents, curing accelerators or other catalysts for the curing of epoxy resins apart from the N,N′-(dimethyl)-urone of the general formula (I) or mixtures thereof, and wherein the epoxy resin composition comprises the N,N′-(dimethyl)-urone of the general formula (I) or mixtures thereof in an amount of from 0.1 to 8 wt. % based on the mass of the epoxy resin composition, that during curing at a temperature of from 60 to 160° C., generates a maximum heat flow in the epoxy resin composition of from 0.05 to 0.99 W/g (based on the mass of the epoxy resin composition), so that the epoxy resin composition cures fully; and (ii) curing the epoxy resin composition at a temperature of from 60 to 160° C. so that the epoxy resin composition cures fully, wherein the proportion of unreacted epoxy groups in the cured epoxy resin composition is <2%.