Patent ID: 7910656
Filing Date: 2011-03-22
Classification: C08L,C09J

Abstract:
1. A composition comprising: a) a first epoxy resin comprising one or more polyglycidyl ethers of bisphenols, polyglycidyl ethers of novolacs or adducts of bisphenol A with aliphatic diols having glycidyl groups; b) a second epoxy resin modified with at least about 30 weight percent of a mixture comprising three different acrylonitrile-butadiene rubbers comprising b1) one comprising about 10 weight percent of acrylonitrile; b2) one comprising about 17 weight percent of acrylonitrile and b3) one comprising about 26 weight percent of acrylonitrile, the mixture of rubbers comprising on average less than about 20 weight percent acrylonitrile, and c) a toughener comprising a polyurethane, polyurea, or polyurethane elastomer terminated with phenolic moieties; the total amount of component b) and component c) being more than about 30 percent based on the total weight of the composition, the weight ratio of component c) to component b) being greater than about 1.3:1, the composition containing at least 4.2 weight percent of the acrylonitrile-butadiene rubber, and the cured composition demonstrates an impact peel strength at −40° C. of greater than 25 N/mm.