Novel Liquid Epoxy Resin and its Cured Products Providing both of Excellent Flexibility and Outstanding Toughness

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We succeeded in the development of a novel liquid epoxy resin providing both of excellent flexibility and outstanding toughness to its cured resins. The main drawback of epoxy resins “Stiff but Brittle” was largely improved by an epoxy resin based on bisphenol A and modified with a high concentration of a flexible skeleton.<BR>We were able to synthesize the new type of epoxy resin by reaction of bisphenols with vinyl ethers, leading to phenolic intermediate having a special acetal structure. This phenolic intermediate was epoxidized by epichlorohydrin. The resulting epoxy resin exhibit both high flexibility and excellent toughness after curing. In view of this, it was expected that such epoxy resins are able to solve the problems and future demands in difficult high-tech applications, such as printed circuit board and the like.<BR>The excellent performance is considered to be based on the synergy effect of the hard-segment (with the molecular mobility reduced by cross-linking points located closely to that hard segment) providing much larger strength and the soft-segment (mobility of which was larger because of the position far from cross-linking points) performing excellent flexibility.

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