Golf ball
An object of the present disclosure is to provide a golf ball from which stain such as mud or grass juice can be wiped off when the stain is adhered to the golf ball while the spin performance of the golf ball on approach shots is not substantially lowered. The present disclosure 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 at least one layer of the paint film contains a polyurethane as a resin component, and the polyurethane has a structural unit derived from a polyether polycarbonate diol.
1 . 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 at least one layer of the paint film contains a polyurethane as a resin component, and the polyurethane has a structural unit derived from a polyether polycarbonate diol represented by the formula (A),
in the formula (A), R 1 and R 2 are identical to or different from each other and are a linear alkylene group having 1 to 30 carbon atoms or a branched alkylene group having 1 to 30 carbon atoms, 1 and n are identical to or different from each other and are a number in a range from 2 to 15, and m is a number in a range from 1 to 15.
2 . The golf ball according to claim 1 , wherein the polyether polycarbonate diol has a number average molecular weight ranging from 800 to 2500.
3 . The golf ball according to claim 1 , wherein an amount of the polyether polycarbonate diol component in the polyurethane ranges from 15 mass % to 70 mass %.
4 . The golf ball according to claim 1 , wherein R 1 and R 2 in the formula (1) are each a linear alkylene group having 1 to 10 carbon atoms.
5 . The golf ball according to claim 1 , wherein the polyurethane has a structural unit derived from a polycarbonate diol different from the polyether polycarbonate diol.
6 . The golf ball according to claim 1 , wherein the polyurethane has a structural unit derived from a polyisocyanate.
7 . The golf ball according to claim 6 , wherein the polyisocyanate includes at least one member selected from the group consisting of an isocyanurate-modified product of hexamethylene diisocyanate, an adduct-modified product of hexamethylene diisocyanate, a biuret-modified product of hexamethylene diisocyanate, and an isocyanurate-modified product of isophorone diisocyanate.
8 . The golf ball according to claim 1 , wherein an outermost layer of the paint film contains the polyurethane.
9 . The golf ball according to claim 1 , wherein in the formula (A), R 1 and R 2 are n-butylene group, and 1 and n are same.
10 . The golf ball according to claim 5 , wherein the polycarbonate diol has a repeating unit (B) represented by the formula (B) and a repeating unit (C) represented by the formula (C),
in the formula (B), R 3 represents a divalent hydrocarbon group having 2 to 20 carbon atoms, and p is a number in a range from 3 to 50, and
in the formula (C), R 4 is different from R 3 , and represents a divalent hydrocarbon group having 3 to 20 carbon atoms, or a divalent hydrocarbon group having 3 to 20 carbon atoms and including an alicyclic structure or heterocyclic structure, and q is a number in a range from 0 to 50.
11 . The golf ball according to claim 5 , wherein the polycarbonate diol is a liquid polycarbonate diol at a temperature of 25° C.
12 . The golf ball according to claim 5 , wherein the polycarbonate diol has a number average molecular weight in a range from 400 to 1,200.
13 . The golf ball according to claim 1 , wherein the polyurethane is obtained by a reaction between a polyisocyanate composition containing a polyisocyanate and a polyol composition containing a urethane polyol, and the urethane polyol includes the polyether polycarbonate diol as a first polyol component.
14 . The golf ball according to claim 13 , wherein the urethane polyol further includes a polycarbonate diol different from the polyether polycarbonate diol as the first polyol component.
15 . The golf ball according to claim 14 , wherein a mass ratio of the polyether polycarbonate diol/the polycarbonate diol ranges from 40/60 to 90/10.