Patent ID: 8338535
Filing Date: 2012-12-25
Classification: C08J,C08L,Y10T

Abstract:
1. An epoxy resin composition comprising the following [A], [A′], [B], and [C]: [A] a bisphenol A epoxy resin or a bisphenol F epoxy resin having a glass transition temperature or melting point of 50° C. or higher; [A′] an epoxy resin which is in a liquid state at 25° C.; [B] an epoxy resin curing agent; and [C] at least one block copolymer selected from the group consisting of S-B-M, and M-B-M, wherein the blocks are linked to each other by a covalent bond or by an intermediate molecule bound to one of the blocks via one covalent bond formation and to the other block via another covalent bond formation; the block M is a methyl methacrylate homopolymer or a copolymer comprising at least 50% by weight of methyl methacrylate; the block B is incompatible with the block M and has a glass transition temperature of 20° C. or lower; and the block S is incompatible with the blocks B and M and has a glass transition temperature higher than that of the block B; and wherein the epoxy resin composition comprises 10 to 60 parts by weight of the component [A] with respect to 100 parts by weight in total of epoxy resins; 1 to 15 parts by weight of the component [B] with respect to 100 parts by weight in total of epoxy resins; 1 to 15 parts by weight of the component [C] with respect to 100 parts by weight in total of epoxy resins; and 10 to 90 parts by weight of the component [A′] with respect to 100 parts by weight in total of epoxy resins.