Patent ID: 8658736
Filing Date: 2014-02-25
Classification: B32B,C08G,C08J,C08L,Y10T

Abstract:
1. An epoxy resin composition comprising an epoxy resin [A], an amine-based curing agent [B] and a block copolymer [C] as components, wherein the epoxy resin [A] contains the following [Aa] and [Ab], the component [Ab] contains the following components [Ab1′], [Ab2] and [Ab3], the component [B] is dicyandiamide, and the block copolymer [C] is defined below, wherein the component [A] contains, based on 100 mass % of the component [A], 20 to 50 mass % of the component [Aa] and 5 to 20 mass % of the component [Ab1′], contains the component [Ab2] to ensure that the sum of the components [Ab1′] and [Ab2] is 20 to 40 mass % and contains the component [Ab3] to ensure that the sum of the components [Aa] and [Ab3] is 60 to 80 mass %; and the component [C] is contained in an amount of 1 to 10 parts by mass per 100 parts by mass of the component [A]: [Aa] is a biphenyl epoxy resin having a biphenyl structure; [Ab1′] is a diglycidylaniline derivative represented by the following general formula (I); wherein each R denotes, respectively independently, hydrogen, a straight-chain or branched alkyl group with 1 to 5 carbon atoms, or a straight-chain or branched alkoxy group with 1 to 5 carbon atoms; [Ab2] is a liquid bisphenol epoxy resin; [Ab3] is a solid bisphenol epoxy resin; and [C] is at least one block copolymer selected from the group consisting of S-B-M, B-M and M-B-M, wherein the aforementioned respective blocks are linked by a covalent bond or are linked by an intermediate molecule connected with one block by one covalent bond and with the other block by another covalent bond; block M is a block consisting of polymethyl methacrylate homopolymer or a copolymer containing at least 50 wt % of methyl methacrylate; block B is a block immiscible with the block M and has a glass transition temperature of 20° C. or lower; and block S is a block immiscible with the blocks B and M and has a glass transition temperature higher than the glass transition temperature of the block B.