Composition of tetraglycidyl, triglycidyl and diglycidyl epoxy resins
AssigneeTonen Corporation
InventorsOsamu Watanabe, Shinichi Murakami, Sadahisa Wada, Hiroshi Inoue
Life of this patent
Estimating the term…
Abstract
An epoxy resin composition useful as a matrix for fiber-reinforced composites is disclosed which includes a mixture containing 30-95% by weight of a tetrafunctional epoxy resin, 3-40% by weight of an admixture of trifunctional epoxy resin oligomers and 2-50% by weight of a bisphenol A epoxy resin having a number average molecular weight of 450-1,300 and such a weight average molecular weight as to provide a ratio of the weight average molecular weight to the number average molecular weight of 1.3-3.0.
Claims7
An epoxy resin composition for forming fiber-reinforced composites having good tack and drape qualities, said composition consisting essentially of (A) 30-95% by weight of a tetrafunctional epoxy resin, (B) 3-40% by weight of a trifunctional epoxy resin, (C) 2-50% by weight of an admixture of epoxy resin oligomers, each of said oligomers being a polymer of a diglycidyl ether of bisphenol A having the following formula:
- ##STR2## wherein n is a number providing a number average molecular weight of 380-5,500, said resin admixture (C) having a number average molecular weight of 450-1,300 and a weight average molecular weight providing a ratio of the weight average molecular weight to the number average molecular weight of 1.3-3.0 and (D) a curing agent.
Dependencies are inferred from the claim text.