Patent ID: 9717963
Date: 2017-08-01
CPC Classifications: A63B,B29C,C08J,C08L

Claim:
1. 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, as epoxy resin components, a first epoxy resin component of 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 second epoxy resin component of a tetraglycidyl type epoxy resin; and wherein 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, and the tetraglycidyl type epoxy resin content in the epoxy component ranges from 1 mass % to 19 mass %.