US 7,585,558 B2
Carbon fiber-reinforced resin composite materials
Yoshinori Suzuki, Shizuoka (Japan); Yutaka Miura, Shizuoka (Japan); Katsura Horikoshi, Gunma (Japan); and Mitsuhiro Yada, Gunma (Japan)
Assigned to Toho Tenax Co., Ltd., Bunkyo-ku, Tokyo (Japan); and Showa Highpolymer Co., Ltd., Chiyoda-ku, Tokyo (Japan)
Appl. No. 10/543,137
PCT Filed Jan. 28, 2004, PCT No. PCT/JP2004/000732
§ 371(c)(1), (2), (4) Date Dec. 01, 2005,
PCT Pub. No. WO2004/067612, PCT Pub. Date Aug. 12, 2004.
Claims priority of application No. 2003-022384 (JP), filed on Jan. 30, 2003.
Prior Publication US 2006/0154039 A1, Jul. 13, 2006
Int. Cl. D04H 13/00 (2006.01)
U.S. Cl. 428—292.1  [428/364; 428/375] 10 Claims
OG exemplary drawing
 
1. A carbon fiber-reinforced resin composite material produced by curing a composition comprising
(1) a resin mixture comprising:
(A) an epoxy group-containing vinyl ester resin having, in the molecule, 0.8 to 0.3 equivalent of epoxy group and 0.2 to 0.7 equivalent of an ethylenically unsaturated group,
(B) a radical-polymerizable monomer, and
(C) a curing agent comprising an organic peroxide curing agent and a curing agent for epoxy resin, and
(2)
(D) a carbon fiber in form strand impregnated with a sizing agent for bundling of carbon fiber filaments in an amount of 0.3 to 5% by mass based on the carbon fiber (D), wherein the sizing agent contains (d) a vinyl ester resin, having substantially no epoxy group, in an amount of 30% by mass of more, which is obtained by an addition reaction of an epoxy resin and an ethylenically unsaturated carboxylic acid, wherein the carbon fiber-reinforced resin composite material has a bending strength of 900 Mpa or higher.