Sumitomo Rubber Industries Limited

Dunlop Sports Company Limited

Yasuo Naito

Kazuyoshi Shiga

Masayuki Onishi

Takahiro Shigemitsu

Hiroshi Hasegawa

Takehiko Hyodo

Shintaro Tomita

Hiromasa Tsunashima

Daisuke Kudo

Shimpei Oyama

Tetsuro Abe

Yuko Oka

An object of the present disclosure is to provide a novel golf ball having excellent spin performance on approach shots. The present disclosure provides a golf ball comprising a paint film, wherein a base resin constituting an outermost layer of the paint film is a polyurethane obtained by a reaction between (A) a polyol composition containing a polyol having a side chain and (B) a polyisocyanate composition, a loss modulus (E″) at a temperature of −50° C. is 2.0×10Pa or more, and a loss tangent (tan δ) has a peak with a peak height of 0.1 or more and 0.5 or less in a temperature range of −60° C. or more and −20° C. or less, wherein the loss modulus (E″) and the loss tangent (tan δ) are obtained by measuring a dynamic viscoelasticity of the polyurethane under specific conditions.

Golf ball

An object of the present invention is to provide a novel golf ball having excellent spin performance on approach shots. The present invention provides a golf ball comprising a golf ball body and a paint film composed of at least one layer and formed on a surface of the golf ball body, wherein a base resin constituting an outermost layer of the paint film is a polyurethane obtained by a reaction between (A) a polyol composition and (B) a polyisocyanate composition, and a loss modulus (E&#x2033;) at the temperature of &#x2212;50&#xb0; C. obtained by measuring a dynamic viscoelasticity of the polyurethane is 1.00&#xd7;10Pa or more.

An object of the present invention is to provide a novel golf ball having excellent spin performance on approach shots. The present invention provides a golf ball comprising a golf ball body, and a paint film formed on a surface of the golf ball body and composed of at least one layer, wherein a base resin constituting an outermost layer of the paint film includes a polyurethane, and the polyurethane has a loss elastic modulus (E&#x2033;) of 0.2&#xd7;10Pa or more at &#x2212;50&#xb0; C. and a loss tangent (tan &#x3b4;) having a peak temperature of 0&#xb0; C. or less, obtained by measuring dynamic viscoelasticity of the polyurethane under specific conditions.

According to a tire comprising a CFRP comprising a matrix resin and a carbon fiber, in which the matrix resin comprises a resin component comprising 20 to 80% by mass of an epoxy resin and 20 to 80% by mass of a functional group-modified acrylonitrile butadiene copolymer, it is possible to provide a tire which is lightened while maintaining the strength of a tire with a steel cord and/or a bead wire.

Tire

An object of the present invention is to provide a novel fiber-reinforced epoxy resin material having improved strength. The fiber-reinforced epoxy resin material of the present invention comprises a cured product of an epoxy resin composition and a reinforcing fiber, wherein the epoxy resin composition comprises a novolac 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.

Fiber-reinforced epoxy resin material, prepreg and, tubular body made of fiber-reinforced epoxy resin material

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.

Golf club shaft

A shafthas a plurality of full length layers s, s, and sto s. The full length layers have full length bias layers sand s, and full length straight layers s, s, and s. The full length straight layers s, s, slocated outside the full length bias layers sand sinclude a novolac-containing layer. In the novolac-containing layer, a content Rn of the novolac type epoxy resin is 3% by mass or greater and 19% by mass or less. If an average specific gravity of the novolac-containing layers constituting the full length straight layers is defined as S, and an average specific gravity of the full length bias layers and inside of the full length bias layers is defined as S, the specific gravity Sis greater than the specific gravity S

It is an object to provide a tubular body made from a novel fiber-reinforced epoxy resin material having improved strength. A tubular body made of a fiber-reinforced epoxy resin material according to the present invention is a tubular body made of a fiber-reinforced epoxy resin material comprising a cured product of an epoxy resin composition and a reinforcing fiber. The cured product of the epoxy resin composition has a swelling ratio of 20% by mass to 42.5% by mass in methyl ethyl ketone.

Growing community of inventors

Kobe, Japan

Yasuo Naito