Patent ID: 7745549

Claim:
A method of forming a composition having a von Mises strain of at least 0.300 by combining a mixture comprising at least one diamine and at least one epoxy resin which collectively have the von Mises strain of at least 0.300, the mixture comprising one of the following: (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; and (6) a 1,3 bis(3-aminophenoxy)-2,2 dimethylpropane and a diglycidyl ether of Bisphenol-A.