公开(公告)号：US09717963B2

公开(公告)日：2017-08-01

申请号：US14902097

申请日：2014-06-06

Applicant: DUNLOP SPORTS CO. LTD.

Inventor： Yasuo Naito ,  Takehiko Hyodo ,  Kazuyoshi Shiga ,  Hiroshi Hasegawa

IPC: A63B53/10 ,  C08J5/24 ,  C08L63/00 ,  B29C70/20

CPC classification number: A63B53/10 ,  A63B2209/023 ,  B29C70/202 ,  C08J5/24 ,  C08J2363/00 ,  C08J2363/02 ,  C08J2429/14 ,  C08J2463/00 ,  C08J2463/04 ,  C08J2463/08 ,  C08L63/00 ,  C08L2205/025 ,  C08L2205/03

Abstract: An object of the present invention is to provide a golf club shaft having excellent strength. The present invention provides a golf club shaft made of a fiber-reinforced epoxy resin material comprising a cured product of an epoxy resin composition and a reinforcing fiber, wherein the epoxy resin composition comprises at least one selected from the group consisting of a bisphenol A type epoxy resin, a bisphenol F type epoxy resin and a novolac type epoxy resin, and a tetraglycidyl type epoxy resin as an epoxy resin component, and the cured product of the epoxy resin composition has a swelling ratio in a range from 20 mass % to 44 mass % in methyl ethyl ketone.