Patent ID: 8686069
Filing Date: 2014-04-01
Classification: C08L

Abstract:
1. An uncured thermoplastic-toughened epoxy resin which, when cured, is resistant to solvent-induced cracking, said uncured thermoplastic-toughened epoxy resin comprising: an epoxy resin component comprising from 30 to 40 weight percent of a tri functional epoxy resin and from 10 to 20 weight percent of a tetra functional epoxy resin, based on the total weight of said uncured thermoplastic-toughened epoxy resin; a thermoplastic component comprising from 10 to 20 weight percent of a low molecular weight polyethersulfone, from 5 to 15 weight percent of polyamideimide and from 1 to 5 weight percent of polyamide particles, based on the total weight of said uncured thermoplastic-toughened epoxy resin, wherein the molecular weight of said low molecular weight polyethersulfone is between 10,000 and 30,000 g/mole and wherein the amount of said low molecular weight polyethersulfone in said thermoplastic component is sufficient to provide said uncured thermoplastic-toughened epoxy resin, when cured, with said resistance to solvent-induced cracking; and a curative component comprising from 15 to 25 weight percent of a curing agent, based on the total weight of said uncured thermoplastic-toughened epoxy resin.