Patent ID: 9418774
Filing Date: 2016-08-16
CPC Classification: C08G,C08L,H01B

Claim Text:
1. A method of producing a replenished curable epoxy resin composition, the method comprising: providing fresh resin having an inherent viscosity within the range of 80 mPas to 300 mPas measured at 50° C. to a curable epoxy resin composition in a pot at a temperature range of 40° C. to 70° C., by resin replenishment at a rate within the range of 10% to 30% of fresh resin per week, calculated to the total amount of resin present in the pot; wherein the fresh resin is a resin that has not been previously added to the pot; wherein the fresh resin and the curable epoxy resin composition in the pot comprise an aromatic epoxy resin component, a latent catalyst system, and optional additives; wherein the replenished curable epoxy resin composition is a volatile-free single epoxy resin composition having a prolonged pot life at a processing temperature within the range of 40° C. to 70° C.; and wherein: (a) the aromatic epoxy resin component is a compound of formula (I) in monomeric form or in polymeric form thereof, or as a mixture thereof: said aromatic epoxy resin component having an inherent viscosity within the range of 80 mPas to 300 mPas, measured at a temperature of 50° C.; (b) the latent catalyst system comprises at least one metal acetylacetonate and at least one phenolic compound, wherein (b1) the at least one metal acetylacetonate is present in a concentration of 0.1 phr to 1.0 phr (parts per hundred parts) of the epoxy resin component; and (b2) the at least one phenolic compound is a dihydroxybenzene, a trihydroxybenzene or a mixture thereof, and is present in a concentration of 0.5 phr to 6.0 phr (parts per hundred parts) of the epoxy resin component.