Patent ID: 6831113
Filing Date: 2004-12-14
Classification: C08G,C08J

Abstract:
A method for making a one component heat curable epoxy resin system, comprising the step of mixing together components (A), (B), (C), and (E):(A) an epoxy resin or compound containing more than one epoxy group; (B) an amine solidifying system present in insufficient quantities to cause gelation after the amino hydrogen atoms are consumed by epoxy groups, under the reaction conditions chosen for (A) and (B) and which yields a product with a Kofler Heat Bank melting point of less than 55Â° C. (C) a latent hardener system for (A) and the reaction product of (A) and (B), wherein (C) is different from (B) and remains sufficiently unreacted under the conditions of reaction for (A) and (B) such that the one component heat curable epoxy resin system has a tack life of at least 6 months at room temperature; and (E) an expanding agent in such a way that (A) and (B) react to completion at room temperature over a period of between 2 and 14 days; and wherein the reaction product of (A) and (B) has melting point stability of at least six months at normal workshop temperatures.