Patent ID: 7985808

Claim:
A composition having a von Mises strain of at least 0.300 comprising at least one diamine and at least one epoxy resin, which collectively have the von Mises strain of at least 0.300, the composition comprising one of the following groups: (1) a Bisphenol F based tri-functional novolac epoxy resin and a 4,4′ bis(3-aminophenoxy) diphenylsulfone; (2) a Bisphenol F based tri-functional novolac epoxy resin and a 3,3′ diaminodiphenylsulfone; (3) a Bisphenol F based tri-functional novolac epoxy resin and a 1,3 bis(3-aminophenoxy) benzene; (4) a diglycidyl α, α′-bis(4-hydroxyphenyl)-p-diisopropylbenzene and a 4,4′ bis(3-aminophenoxy) diphenylsulfone; (5) a 1,3 bis(4-aminophenoxy)-2,2 dimethylpropane and a diglycidyl ether of Bisphenol-A; or (6) a 1,3 bis(3-aminophenoxy)-2,2 dimethylpropane and a diglycidyl ether of Bisphenol-A.