Golf club shaft
AssigneeDunlop Sports Co. Ltd.
InventorsYasuo Naito, Takehiko Hyodo, Kazuyoshi Shiga, Hiroshi Hasegawa
Life of this patent
Estimating the term…
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.
Claims20
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 %.
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 an epoxy resin component,
- a bisphenol A type epoxy resin;
- a bisphenol F type epoxy resin;
- a novolac type epoxy resin;
- and
- 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.
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 an epoxy resin component,
- a novolac type epoxy resin;
- and
- 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 and the novolac type epoxy resin total content in the entire epoxy resin components ranges from 4 mass % to 25 mass %.
Dependencies are inferred from the claim text.