Mitsubishi Gas Chemical Company, Inc.

Kana Kumamoto

Eiichi Honda

Masayoshi Takahashi

Nobuhiko Matsumoto

Shinichi Ayuba

Shigeyuki Hirose

Shinichi Yonehama

An epoxy resin curing agent which provides good adhesiveness to polyester in addition to excellent performance and high gas-barrier properties of epoxy resins, an epoxy resin composition containing the epoxy resin curing agent, an adhesive for laminating which mainly contains the composition, a laminate film obtained by using the adhesive, a multi-layer packaging material, and a packaging bag. The epoxy resin curing agent is a reaction product of (A) m-xylylenediamine or p-xylylenediamine, (B) a polyfunctional compound having one acyl group, which forms amide linkage by a reaction with polyamine and is capable of forming an oligomer; and (C) an aromatic dicarboxylic acid, an ester thereof, an amide thereof, an acid anhydride thereof, or an acid chloride thereof.

Epoxy resin curing agent, epoxy resin composition, and adhesive agent for laminate

Provided are an epoxy resin curing agent having excellent properties and high gas barrier capability that epoxy resin has and, in addition thereto, capable of realizing good adhesiveness to polyester and aluminum; an epoxy resin composition containing the curing agent; an adhesive for lamination including the composition as the main ingredient thereof; and a laminate film, a multilayer wrapping material and a wrapping bag using the adhesive. The epoxy resin curing agent comprises a reaction product of the following (A), (B) and (C): (A) meta-xylylenediamine or para-xylylenediamine, (B) a polyfunctional compound having one acyl group and capable of forming an amide group moiety through reaction with a polyamine and forming an oligomer, (C) a metal (meth)acrylate salt with a divalent or more polyvalent metal.

The present invention provides an amine based epoxy resin curing agent and an epoxy resin composition containing the curing agent. The epoxy resin composition has a high gas barrier performance, a long pot life, and utility as a coating material or an adhesive for laminates. The amine based epoxy resin curing agent is composed of a reaction product of (A), (B) and (D) or (A), (B), (C) and (D): (A) m-xylylenediamine or p-xylylenediamine; (B) a polyfunctional compound having at least one acyl group, which is capable of forming an amide group site through a reaction with a polyamine and forming an oligomer; (C) a monovalent carboxylic acid having from 1 to 8 carbon atoms and/or its derivative; and (D) a functional compound having at least one carbonate site represented by the formula (2), which is capable of forming a carbamate site represented by the formula (1) through a reaction with a polyamine: 

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Kanagawa, Japan

Kana Kumamoto