Golf ball
AssigneeSumitomo Rubber Industries, Ltd.
InventorsYasuo Naito, Yuko Oka, Shimpei Oyama, Tetsuro Abe, Kazuyoshi Shiga
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Abstract
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″) at the temperature of −50° C. obtained by measuring a dynamic viscoelasticity of the polyurethane is 1.00×108 Pa or more.
Claims17
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,
- (A) the polyol composition contains a urethane polyol, the urethane polyol includes a polyether diol having a number average molecular weight in a range of from 800 to 3000 as a constituent component, and an amount of the polyether diol in the urethane polyol is 55 mass % or more and 65 mass % or less, and
- a loss modulus (E″) at the temperature of −50° C. obtained by measuring a dynamic viscoelasticity of the polyurethane under following conditions is 1.00×108 Pa or more:
- <measurement conditions>
- measuring mode:
- sine wave tensile mode
- measuring temperature range:
- −120° C. to 100° C.
- temperature increasing rate:
- 3° C. /min
- oscillation frequency:
- 10 Hz
- measuring strain:
- 0.05%.
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,
- a molar ratio (NCO group/OH group) of isocyanate groups (NCO groups) included in (B) the polyisocyanate composition to hydroxyl groups (OH groups) included in (A) the polyol composition ranges from 1.3 to 1.5,
- a 10% elastic modulus of the outermost layer of the paint film is 2 kgf/cm2 or more and 48 kgf/cm2 or less, and
- a loss modulus (E″) at the temperature of −50° C. obtained by measuring a dynamic viscoelasticity of the polyurethane under following conditions is 1.00×108 Pa or more:
- <measurement conditions>
- measuring mode:
- sine wave tensile mode
- measuring temperature range:
- −120° C. to 100° C.
- temperature increasing rate:
- 3° C. /min
- oscillation frequency:
- 10 Hz
- measuring strain:
- 0.05%.
Dependencies are inferred from the claim text.