Patent ID: 7883766
Filing Date: 2011-02-08
Classification: C08G,C08J,C08K,Y10T

Abstract:
1. A prepreg comprising a resin composition and reinforcing fibers, the reinforcing fibers being impregnated with the resin composition, and the resin composition comprising: 20 to 70 parts by mass of epoxy resin component (A); 10 to 50 parts by mass of bifunctional epoxy resin component (B); 15 to 70 parts by mass of tetrafunctional epoxy resin component (C); and an aromatic amine compound component (D); wherein the epoxy resin component (A) is prepared by mixing and heating: 10 to 90 parts by mass of a bifunctional epoxy resin (a1), 0.5 to 40 parts by mass of a trifunctional epoxy resin (a2), 10 to 50 parts by mass of a phenol compound (a3), and 1 to 45 parts by mass of a polyamide resin (a4), wherein (a1), (a2), and (a3) total 100 parts by mass, and wherein said heating is performed such that 80% or more of the phenolic hydroxyl groups contained in the phenol compound (a3) undergo a reaction; wherein said phenol compound (a3) is represented by the following formula (I): wherein X represents at least one selected from the group consisting of a hydrogen atom, an alkyl group having 6 or less carbon atoms and Br, and Y represents at least one selected from the group consisting of a direct bond, —CH wherein said polyamide resin (a4) is represented by the following formula (II): wherein X represents an integer from 1 to 10; Y represents an integer from 1 to 10, and Z represents an integer from 1 to 20; PA is represented by the following formula (III): wherein a represents an integer from 0 to 2, b represents an integer from 0 to 2, and 1 represents an integer from 1 to 10, provided that a and b are not 0 at the same time; R wherein R wherein said aromatic amine compound component (D) is provided in an amount of 90% to 175% of a theoretical equivalent amount of component (D), said theoretical equivalent amount of component (D)=[Total moles of epoxy groups in (a1) and (a2) that have been consumed during the preparation of component (A)]−[Moles of phenolic hydroxyl groups in component (a3) that have been consumed during the preparation of component (A)]+[Total moles of epoxy groups in components (B) and (C)].