Compositions containing epoxy resin, chain extender, functionally terminated elastomer and curing agent
AssigneeThe B. F. Goodrich Company
InventorsChangkiu K. Riew, Alan R. Siebert, Eugene H. Rowe
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Abstract
Hard and strong epoxy resin products of high impact resistance are made from a di-epoxy compound, a smaller than equivalent proportion of chain extender which is preferably a bis-phenol, and about 5% (based on the amount of the di-epoxy compound) of a functionally terminated elastomer which is preferably a phenol terminated liquid copolymer of butadiene and acrylonitrile, together with a curing agent active at elevated temperatures.
Claims6
An epoxy resin composition yielding high strength, high modulus, high impact resistant, thermoset products, comprising a di-epoxy compound, a less than equivalent proportion of a diphenol chain lengthening material, a functionally terminated elastomer which is a material having no functional groups other than two terminal phenolic hydroxyl groups, in an amount not over about 71/2 % by weight of the di-epoxy compound, and a curing agent for the epoxy compound.
A method of producing high strength, high modulus, high impact resistant, thermoset epoxy resin products, comprising the preliminary step of preparing a functionally terminated elastomer having a reactivity toward epoxy groups comparable to the reactivity of epoxy groups toward each other by reacting a di-carboxyl terminated elastomer with at least twice the equivalent proportion of a difunctional compound whose functional groups have a reactivity toward epoxy groups comparable to the reactivity of epoxy groups toward each other, and mixing a di-epoxy compound with a less than equivalent proportion of a chain lengthening material, with an amount of the functionally terminated elastomer not over about 71/2 % by weight of the di-epoxy compound, and a curing agent for the epoxy compound, shaping the mixture, and heating to cross-link and set it.
Dependencies are inferred from the claim text.