| 摘要 |
PURPOSE:To provide a solventless structural adhesive having excellent bond strength and heat resistance and suitable for use in bonding metals to each other, by incorporating a specified prepolymer having epoxy groups and a hardener for epoxy resin as essential ingredients. CONSTITUTION:An acrylonitrile/butadiene copolymer (A) having carboxyl groups in the molecule, an epoxy resin (B) and a bisphenol compd. (C) such as bisphenol A or bisphenol F are subjected to an addition reaction in such a proportion that the epoxy group is used in a quantity of at least 1.1 times by equivalent the combined quantity of the carboxyl and phenolic hydroxyl groups, thus obtaining a prepolymer having epoxy groups. The desired structural adhesive is obtd. by incorporating said prepolymer and a hardener (e.g. dicyandiamide or 2-methylimidazole) for epoxy resin as essential ingredients.
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