Golf ball resin composition and golf ball
View Patent ↗The invention provides a resin composition for golf balls having excellent resilience, flexibility and fluidity, and golf balls having excellent resilience and shot feel. The resin composition comprises: (A) at least one selected from the group consisting of (a-1) a binary copolymer of an olefin and a C 3-8 α,β-unsaturated carboxylic acid, (a-2) a metal ion-neutralized product of a binary copolymer of an olefin and a C 3-8 α,β-unsaturated carboxylic acid, (a-3) a ternary copolymer of an olefin, a C 3-8 α,β-unsaturated carboxylic acid, and an α,β-unsaturated carboxylic acid ester, and (a-4) a metal ion-neutralized product of a ternary copolymer of an olefin, a C 3-8 α,β-unsaturated carboxylic acid, and an α,β-unsaturated carboxylic acid ester; (B) a compound containing a hydrocarbon chain, a cationic moiety, and an anionic moiety in its molecule; and (C) a nonionic surfactant, wherein a total degree of neutralization expressed by the following equation is 50-300 mol %: Total degree of neutralization ( % ) = ∑ ( number of moles of cation component in resin composition × valence of cation component ) ∑ ( number of moles of anion component in resin composition × valence of anion component ) × 100 .
1. A resin composition for golf balls, comprising:
(A) a resin component comprising at least one selected from the group consisting of (a-1) a binary copolymer of an olefin and a C 3-8 α,β-unsaturated carboxylic acid, (a-2) a metal ion-neutralized product of a binary copolymer of an olefin and a C 3-8 α,β-unsaturated carboxylic acid, (a-3) a ternary copolymer of an olefin, a C 3-8 α,β-unsaturated carboxylic acid, and an α,β-unsaturated carboxylic acid ester, and (a-4) a metal ion-neutralized product of a ternary copolymer of an olefin, a C 3-8 α,β-unsaturated carboxylic acid, and an α,β-unsaturated carboxylic acid ester;
(B) a compound containing a hydrocarbon chain, a cationic moiety, and an anionic moiety in its molecule wherein the compound is at least one selected from the group consisting of lauryl betaine, oleyl betaine, stearyl betaine, stearyl dihydroxymethyl betaine, stearyl dihydroxyethyl betaine, lauryl dihydroxymethyl betaine, lauryl dihydroxyethyl betaine, myristyl dihydroxymethyl betaine, behenyl dihydroxymethyl betaine, palmityl dihydroxyethyl betaine, oleyl dihydroxymethyl betaine, cocamidopropyl betaine, lauramidoalkyl betaines, 2-alkyl-N-carboxyalkyl imidazolinium betaines, lauramidoalkyl hydroxyl sulfobetaines, cocamidodialkyl hydroxyalkyl sulfobetaines, N-alkyl-b-aminopropionic acid salts, N-alkyl-b-iminodipropionic acid salts, alkyl diaminoalkyl glycines, alkyl polyaminoalkyl glycines, and alkylamino fatty acid sodium salts; and
(C) a nonionic surfactant,
wherein a total degree of neutralization expressed by the following equation is 50 to 300 mol %:
Total
degree
of
neutralization
(
%
)
=
∑
(
number
of
moles
of
cation
component
in
resin
composition
×
valence
of
cation
component
)
∑
(
number
of
moles
of
anion
component
in
resin
composition
×
valence
of
anion
component
)
×
100.
2. The resin composition for golf balls according to claim 1 , wherein the nonionic surfactant (C) is a polyhydric alcohol nonionic surfactant.
3. The resin composition for golf balls according to claim 1 , wherein the nonionic surfactant (C) is at least one selected from the group consisting of fatty acid esters obtained by reaction of polyhydric alcohols with fatty acids, AO adducts of the fatty acid esters obtained by addition of alkylene oxides to the fatty acid esters, fatty acid alkanolamides obtained by reaction of fatty acids with alkanolamines, and alkyl ethers of polyhydric alcohols.
4. The resin composition for golf balls according to claim 1 , wherein the nonionic surfactant (C) is a fatty acid ester obtained by reacting a polyhydric alcohol with a C 8-30 fatty acid.
5. The resin composition for golf balls according to claim 4 , wherein the fatty acid ester is a compound in which hydroxyl groups of the polyhydric alcohol are partially esterified.
6. The resin composition for golf balls according to claim 2 , wherein the polyhydric alcohol is at least one selected from the group consisting of glycerol, polyglycerol, saccharides, and sugar alcohols.
7. The resin composition for golf balls according to claim 1 , wherein the nonionic surfactant (C) is at least one selected from the group consisting of glycerol monocaprylate, glycerol monocaprate, glycerol monooleate, glycerol dioleate, diglycerol monolaurate, sorbitan monooleate, sorbitan dioleate, sorbitan trioleate, and sorbitan tetraoleate.
8. The resin composition for golf balls according to claim 1 , wherein the nonionic surfactant (C) is a polyhydric alcohol nonionic surfactant.
9. The resin composition for golf balls according to claim 1 , wherein 1 to 200 parts by mass of the compound (B) containing a hydrocarbon chain, a cationic moiety, and an anionic moiety in its molecule is contained per 100 parts by mass of the resin component (A).
10. The resin composition for golf balls according to claim 1 , wherein 10 to 200 parts by mass of the nonionic surfactant (C) is contained per 100 parts by mass of the resin component (A).
11. The resin composition for golf balls according to claim 1 , which further comprises (D) a basic inorganic metal compound in an amount of 100 parts by mass or less per 100 parts by mass of the resin component (A).
12. The resin composition for golf balls according to claim 1 , wherein a blending ratio [(B)/(C)] of the compound (B) containing a hydrocarbon chain, a cationic moiety, and an anionic moiety in its molecule to the nonionic surfactant (C) is 95/5 to 15/85 by mass ratio.
13. The resin composition for golf balls according to claim 1 , which satisfies the following relationship:
5 parts by mass≦[(amount of ( B ))−(amount of ( C ))]≦100parts by mass.
14. A golf ball, comprising a structural member formed from the resin composition for golf balls according to claim 1 .
15. A golf ball, comprising a core having one or more layers and a cover covering the core, wherein at least one of the layers of the core is formed from the resin composition for golf balls according to claim 1 .
16. A one-piece golf ball, comprising a golf ball body formed from the resin composition for golf balls according to claim 1 .