# US 2008/0185757 A1 · Epoxy resin for prepreg, prepreg, fiber-reinforced composite material, and processes for producing these > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2008/0185757 A1 - Document ID: US20080185757A1 - Status: Published application - Kind: A1 - Application number: 12/056,320 - Filed: 2008-03-27 - Published: 2008-08-07 - Earliest claimed: 2002-11-28 - Assignees: Mitsubishi Rayon Co., Ltd. - Inventors: Tsuneo Takano; Akitada Yanase; Tadashi Sakai; Kiharu Numata; Akihiro Ito; Masato Taguchi; Junichi Muramatsu; Kazuya Goto; Kazuki Koga - Web page: https://patentgrep.com/patent/US20080185757A1 ## CPC - C08G 59/504: {containing an atom other than nitrogen belonging to the amine group, carbon and hydrogen} - C08G 59/18: Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups {; e.g. general methods of curing} - C08G 59/56: together with other curing agents - C08J 5/243: {using carbon fibres} - C08J 5/244: {using glass fibres} - C08J 5/249: {characterised by the additives used in the prepolymer mixture} - C08J 2363/00: Characterised by the use of epoxy resins; Derivatives of epoxy resins - Y10T 428/24355: Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.] - Y10T 428/24405: Polymer or resin [e.g., natural or synthetic rubber, etc.] - Y10T 428/24994: Fiber embedded in or on the surface of a polymeric matrix - Y10T 428/249942: Fibers are aligned substantially parallel - Y10T 428/249945: Carbon or carbonaceous fiber - Y10T 428/2964: Artificial fiber or filament - Y10T 428/2971: Impregnation - Y10T 428/30: Self-sustaining carbon mass or layer with impregnant or other layer - Y10T 428/31511: Of epoxy ether - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS - C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract An epoxy resin composition suitably used for a prepreg which can complete curing in a short time even at a low temperature and secure a sufficient usable period under preservation at room temperature, in comparison with conventional epoxy resin compositions. An epoxy resin composition comprising at least one of an epoxy resin, an amine compound having at least one sulfur atom in the molecule thereof, and a reaction product of an epoxy resin and an amine compound having at least one sulfur atom in the molecule thereof, and an amine compound having at least one sulfur atom in the molecule thereof, and a urea compound and a dicyandiamide, wherein each of the contents of the sulfur atom and the urea compound in the epoxy resin composition is respectively 0.2 to 7% by mass and 1 to 15% by mass. ## Claims ### Claim 1 A method for producing a fiber-reinforced composite material molding comprising: preliminarily adjusting a temperature of a mold to be equal to or more than the curing temperature of a thermosetting resin; putting a molding material which has one side surface area S1 and is impregnated with the thermosetting resin in a substantially continuous reinforced fiber, in the temperature-adjusted mold which has one side surface area S2; fastening the mold following the former process and then filling the whole inside of the mold with a molding material; and being subjected to compression molding in a manner that S1/S2 is 0.8 to 1. ### Claim 2 (depends on 1) The method for producing a fiber-reinforced composite material molding according to claim 1, each of a volume and a thickness of the molding material which was impregnated with the thermosetting resin in the substantially continuous reinforced fiber, is respectively 100 to 120% of a volume and 100 to 150% of a thickness of a finished molding. ### Claim 3 (depends on 1) The method for producing a fiber-reinforced composite material molding according to claim 1, wherein the mold is subjected to degassing by using a degassing mechanism when the whole inside of the mold is filled with the molding material after the mold is fastened. ### Claim 4 (depends on 1) The method for producing a fiber-reinforced composite material molding according to claim 1, wherein the fiber-reinforced composite material molding is stripped off free from decreasing the temperature of the mold. ### Claim 5 (depends on 1) The method for producing a fiber-reinforced composite material molding according to claim 1, which employs as the mold a mold having a mechanism to strip the fiber-reinforced composite material molding therefrom. ### Claim 6 (depends on 1) The method for producing a fiber-reinforced composite material molding according to claim 1, wherein the thermosetting resin is an epoxy resin composition. ### Claim 7 (depends on 1) The method for producing a fiber-reinforced composite material molding according to claim 1, wherein the reinforced fiber is a carbon fiber. ### Claim 8 (depends on 1) The method for producing a fiber-reinforced composite material molding according to claim 1, which, in place of the molding material which was impregnated with the thermosetting resin in the substantially continuous reinforced fiber, employs a molding material which comprises one material impregnated with a thermosetting resin in a substantially continuous reinforced fiber and other material impregnated with a thermosetting resin in a staple reinforced fiber and laminated on at least one side surface of the former material.