JP2008264038A - Golf ball - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the scuff resistance and durability of a golf ball using petroleum-free based material. <P>SOLUTION: This golf ball has a core and a cover for covering the core, and is characterized in that at least one of the core and the core includes (A) polyester resin having a petroleum-free based material as a component, as a resin component, and (B) at least one type selected from a group of metallic compound, carbodiimide, polyisocyanate, organic peroxide, oxazoline compound, and epoxy compound. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a golf ball, and more particularly, to an improvement in durability and scratch resistance of a golf ball.

  In recent years, using a biodegradable resin as a high molecular weight material constituting a golf ball has been studied from the viewpoint of environmental conservation or from the viewpoint that a golfer can practice without collecting a large number of golf balls. For example, Patent Document 1 includes a one-piece golf ball or a single layer or a plurality of layers covering the core for the purpose of providing a golf ball with a reduced load on the natural environment. In such a golf ball, a golf ball in which any one of its constituent members is formed of a biodegradable material is disclosed.

Patent Document 2 discloses a golf ball that is substantially spherical and substantially biodegradable for the purpose of providing a golf ball that allows a golfer to repeatedly practice a golf swing without collecting a large number of golf balls after practice in a narrow place. An outer shell defining an internal cavity and a substantially biodegradable load absorbing member disposed in the internal cavity, the load absorbing member having performance characteristics of a golf ball. A golf ball is disclosed which has a function to influence and make the maximum flight distance of the golf ball less than about 75 yards.
JP 2006-247224 A US Published Patent No. 2004/0209701

  As described above, biodegradable materials have been studied as materials for golf balls. However, golf balls having a cover using a biodegradable material alone as a resin component are very hard and brittle. As a result, the durability and scuff resistance of the golf ball decreases.

  The inventor previously described a golf ball having a core and a cover covering the core, wherein at least one of the core and the cover is a polyester resin having a petroleum-free material as a constituent component as a resin component. It has applied for a golf ball characterized by containing. However, a golf ball having a cover using a polyester resin alone as a constituent component of a petroleum-free material as a resin component also tends to be hard and brittle.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a golf ball using a petroleum-free material and having excellent durability and scratch resistance.

  The golf ball of the present invention that has solved the above problems is a golf ball having a core and a cover that covers the core, wherein at least one of the core and the cover is (A) a non-petroleum-based resin component. A polyester resin having a material as a constituent component and (B) at least one selected from the group consisting of metal compounds, carbodiimides, polyisocyanates, organic peroxides, oxazoline compounds, and epoxy compounds can be obtained. As a result, the inventors have found that the durability and scuff resistance of the golf ball to be improved are improved and the present invention has been completed.

  Examples of the polyester resin include (a) dicarboxylic acid, (b) diol and / or hydroxycarboxylic acid as constituents, and (a) dicarboxylic acid, (b) diol and / or hydroxycarboxylic acid. There may be mentioned those in which at least one of these is a non-petroleum-based material.

  The slab hardness of the polyester resin is preferably 70 or less in Shore D hardness. By setting the Shore D hardness to 70 or less, the durability of the obtained golf ball is further improved.

  As the component (B), a metal compound or carbodiimide is suitable. As the metal compound, for example, a metal oxide or a metal hydroxide is suitable. It is preferable that content of (B) component contained in a cover is 0.1 mass part-20 mass parts with respect to 100 mass parts of resin components.

  According to the present invention, a golf ball using a petroleum-free material and having excellent durability and scratch resistance can be obtained.

  The golf ball of the present invention is a golf ball having a core and a cover covering the core, wherein at least one of the core and the cover is (A) a resin component and a polyester-free material as a constituent component It contains a resin and (B) at least one selected from the group consisting of a metal compound, a carbodiimide, a polyisocyanate, an organic peroxide, an oxazoline compound, and an epoxy compound.

  First, a polyester resin having a deoiled material used in the present invention as a constituent component (hereinafter sometimes simply referred to as “deoiled polyester resin”) will be described.

  The said petroleum-free polyester resin has (a) dicarboxylic acid, (b) diol and / or hydroxycarboxylic acid as a constituent component, and (a) dicarboxylic acid, (b) diol and / or hydroxycarboxylic acid It is sufficient that at least one of these is a non-petroleum-based material, for example, a copolymer polyester resin having a dicarboxylic acid and a diol as constituent components, and at least one of the dicarboxylic acid and the diol is de-petroleum-based. Polyester resin as a material, copolymer polyester resin having dicarboxylic acid, diol, and hydroxycarboxylic acid as constituents, wherein at least one of dicarboxylic acid, diol, and hydroxycarboxylic acid is depetroleumated Polyester resin, polyhydroxycarboxylic acid block as material, A carboxylic acid, a copolymerized polyester resin as a constituent component and a diol, a dicarboxylic acid, a diol, at least one hydroxycarboxylic acid and a polyester resin to petroleum-based materials.

  Here, the non-petroleum-based material is not a material obtained by refining, catalytic reforming, or catalytic cracking of petroleum, but a material derived from plants such as corn, potatoes, beets and sugar cane. For example, it can be obtained by processing corn, potatoes, beets, sugar cane, etc. into starch or sugar (such as cellulose) and fermenting the obtained starch with a microorganism. Moreover, it can also be made by a known fermentation method and / or chemical conversion method using vegetable oils and animal fats.

  The dicarboxylic acid (a) is not particularly limited as long as it is an organic compound having two carboxyl groups in the molecule. For example, succinic acid, adipic acid, azelaic acid, sebacic acid, dodecanedicarboxylic acid, maleic anhydride, Fumaric acid, 1,3-cyclopentanedicarboxylic acid, terephthalic acid, isophthalic acid, 1,4-naphthalenedicarboxylic acid, 2,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 1,8-naphthalenedicarboxylic acid, And dicarboxylic acids, such as biphenyl dicarboxylic acid, are mentioned, and those exemplified may be used alone or as a mixture of two or more. Among these, it is preferable to use succinic acid, adipic acid, fumaric acid, malic acid, pyruvic acid, etc. as a petroleum-removing material.

  The diol (b) is not particularly limited as long as it is an organic compound having two hydroxyl groups in the molecule, and examples thereof include ethylene glycol, propylene glycol, 1,3-propanediol, 1,4-butanediol, , 5-pentanediol, 3-methyl-1,5-pentanediol, 1,6-hexanediol, neopentyl glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, dipropylene glycol, tripropylene glycol, 1,4- Examples include cyclohexanediol and diols such as bisphenol A. The exemplified ones may be used alone or as a mixture of two or more. Among these, it is preferable to use 1,4-butanediol, 1,3-propanediol, ethylene glycol, and the like as the petroleum-free material.

  The hydroxycarboxylic acid is not particularly limited as long as it is an organic compound having one hydroxyl group and one carboxyl group in the molecule. For example, lactic acid, hydroxyacetic acid (glycolic acid), hydroacrylic acid, hydroxybutyric acid , Hydroxyvaleric acid, hydroxycyclohexanecarboxylic acid, salicylic acid, hydroxybenzoic acid, hydroxytoluic acid and the like, and those exemplified may be used alone or as a mixture of two or more.

  Among these, particularly preferred is polybutylene succinate using butanediol as the diol component, succinic acid as the dicarboxylic acid component, butanediol as the diol component, and succinic acid and adipic acid as the dicarboxylic acid component. The polybutylene succinate adipate used can be mentioned. In general, a polymer material having high rigidity also has high hardness. Therefore, when used as a resin component constituting the cover, the obtained cover becomes brittle and the durability is lowered. However, since the polybutylene succinate and the polybutylene succinate adipate have a high hardness and a low hardness, the durability can be increased when used as a resin component constituting the cover. The said petroleum-removed polyester resin can be synthesized by a known method for synthesizing a polyester resin.

  The polybutylene succinate or polybutylene succinate adipate has, for example, a weight average molecular weight of 50,000 to 200,000 (preferably 70,000 to 80,000) and a glass transition temperature of −40 ° C. to −10 ° C. (Preferably −20 ° C. to −30 ° C.) and MFR (190 ° C., 2.16 kg load) of 2 g / 10 min to 30 g / 10 min (preferably 5 g / 10 min to 20 g / 10 min) are preferably used. it can.

  The slab hardness of the petroleum-free polyester resin is preferably 70 or less, more preferably 68 or less, and even more preferably 65 or less in Shore D hardness. If the slab hardness of the depetroleum polyester resin exceeds 70 in Shore D hardness, the resulting cover may be too hard and the durability may be lowered. The lower limit of the slab hardness of the petroleum-free polyester resin is not particularly limited, but is preferably 30 or more, more preferably 35 or more, and further preferably 40 or more in Shore D hardness. This is because if the slab hardness of the petroleum-free polyester resin is less than 30, the tackiness becomes strong and the resilience is lowered. The slab hardness of the petroleum-free polyester resin can be set to the above range by appropriately selecting, for example, the type of copolymerization component, the content ratio, the molecular weight of the resulting polyester resin, and the like. For example, a copolymerized polyester resin of polylactic acid, butanediol, and succinic acid has a lower hardness than the case where polylactic acid is mixed with polybutylene succinate, and therefore has excellent durability.

  In the present invention, it is preferable that the cover contains only the de-peeled polyester resin as the resin component (A). However, as long as the effect of the present invention is not impaired, the cover is removed as the resin component (A). In addition to the petroleum-based polyester resin, other petroleum-based thermoplastic resins can also be contained. If a mixture with another thermoplastic resin is used as the resin component of the cover, in addition to the above-described petroleum-free polyester resin, the scratch resistance of the cover can be further improved. Here, the petroleum-based thermoplastic resin is a thermoplastic resin that does not have a petroleum-free material as a constituent component and is manufactured from a raw material obtained by refining, catalytic reforming, catalytic cracking, or the like.

  Examples of the petroleum thermoplastic resins include ionomer resins, polyurethane resins, polystyrene resins, polyamide resins, and polyester resins. Examples of the ionomer resin include those obtained by neutralizing at least a part of carboxyl groups in a copolymer of ethylene and an α, β-unsaturated carboxylic acid having 3 to 8 carbon atoms with a metal ion, ethylene and carbon number. What neutralized at least one part of the carboxyl group in the terpolymer of 3-8 alpha, beta-unsaturated carboxylic acid and alpha, beta-unsaturated carboxylic acid ester with a metal ion, or these Can be mentioned.

  Specific examples of the ionomer resin are exemplified by trade names: Himilan 1555 (Na), Himilan 1557 (Zn), Himilan 1605 (Na), Himilan 1706 (Zn) commercially available from Mitsui DuPont Polychemical Co., Ltd. ), Himiran 1707 (Na), Himiran AM7311 (Mg), and the like. Examples of the ternary copolymer ionomer resins include Himiran 1856 (Na) and Himiran 1855 (Zn).

  Furthermore, as ionomer resins commercially available from DuPont, Surlyn 8945 (Na), Surlyn 9945 (Zn), Surlyn 8140 (Na), Surlyn 8150 (Na), Surlyn 9120 (Zn), Surlyn 9150 (Zn) ), Surlyn 6910 (Mg), Surlyn 6120 (Mg), Surlyn 7930 (Li), Surlyn 7940 (Li), Surlyn AD8546 (Li), and the like. As the terpolymer ionomer resin, Surlyn 8120 (Na ), Surlyn 8320 (Na), Surlyn 9320 (Zn), Surlyn 6320 (Mg), and the like.

  Examples of the ionomer resin commercially available from ExxonMobil Chemical Co., Ltd. include Iotek 8000 (Na), Iotech 8030 (Na), Iotech 7010 (Zn), Iotech 7030 (Zn), and the like. Examples of the copolymer ionomer resin include Iotech 7510 (Zn) and Iotech 7520 (Zn). As the ionomer resin, those exemplified may be used singly or as a mixture of two or more. Na, Zn, K, Li, Mg, etc. described in parentheses after the trade name of the ionomer resin indicate the metal species of these neutralized metal ions.

  Specific examples of other petroleum-based thermoplastic resins include thermoplastic polyamide resins commercially available from Arkema Co., Ltd. under the trade name “Pebax (for example,“ Pebax 2533 ”), and products from Toray DuPont Co., Ltd. Thermoplastic polyester resins marketed under the names “Hytrel” (for example, “Hytrel 3548”, “Hytrel 4047”), thermoplastic polystyrene resins marketed under the trade name “Lavalon” from Mitsubishi Chemical Corporation, BASF Examples thereof include a thermoplastic polyurethane resin commercially available from Polyurethane Elastomers under the trade name “Elastolan (for example,“ Elastolan ET880 ”)”. Among these, the cover is at least one petroleum-based heat selected from the group consisting of the petroleum-removed polyester resin, ionomer resin, polyurethane resin, polystyrene resin, polyester resin, and polyamide resin as a resin component. It is a preferable aspect to contain a mixture with a plastic resin, and it is a more preferable aspect to contain the mixture of the said petroleum-free polyester resin and ionomer resin.

  30 mass% or more is preferable, as for the content rate of the said petroleum-removable polyester resin in the said mixture, 40 mass% or more is more preferable, and 50 mass% or more is further more preferable. By setting the content of the petroleum-removed polyester resin to 30% by mass or more, the durability improvement effect becomes remarkable. On the other hand, the upper limit of the content of the petroleum-free polyester resin in the mixture is not particularly limited, but is preferably 100% by mass, more preferably 95% by mass, and still more preferably 90% by mass.

  In a preferred embodiment of the present invention, the cover further comprises at least one petroleum-based heat selected from the group consisting of the petroleum-removed polyester resin and ionomer resin, polyurethane resin, polystyrene resin, polyester resin, and polyamide resin. Contains a compatibilizer with a plastic resin. Simply mixing the above-described petroleum-free polyester resin and petroleum-based thermoplastic resin may cause phase separation depending on the type of petroleum-based thermoplastic resin, and the appearance of the resulting golf ball may be reduced. is there.

  The compatibilizing agent only needs to be capable of enhancing the compatibility between the de-petroleum polyester resin and the other petroleum thermoplastic resin, and is appropriately selected according to the type of the petroleum thermoplastic resin. Can do. For example, a thermoplastic elastomer such as a polyolefin-based elastomer, a polyester-based elastomer, a polyurethane-based elastomer, a polyamide-based elastomer, or a polystyrene-based elastomer is modified with a polar functional group.

  Examples of the polar functional group include an epoxy group typified by a carboxyl group and a glycidyl group, a hydroxyl group, and a sulfonic acid group. By using an elastomer modified with a polar functional group, it is possible to enhance the compatibility between the above-described petroleum-free polyester-based resin and other petroleum-based thermoplastic resins.

  Specific examples of the compatibilizer include, for example, maleic acid-modified SEBS (styrene-ethylene-butylene-styrene block polymer), maleic acid-modified SEBC (styrene-ethylene-butylene-olefin crystal block polymer), maleic acid-modified PE ( Polyethylene), methyl methacrylate-glycidyl methacrylate copolymer, ethylene-glycidyl methacrylate copolymer, ethylene-methyl methacrylate-glycidyl methacrylate copolymer, maleic acid-modified PP (polypropylene), maleic acid-modified EVA (ethylene-vinyl acetate copolymer) And a maleic acid-modified EPDM (ethylene-propylene-diene rubber).

  Next, (B) component used by this invention: A metal compound, a carbodiimide compound, a polyisocyanate, an oxazoline compound, an organic peroxide, and an epoxy compound are demonstrated. (B) component used by this invention is used in order to suppress the physical-property fall by hydrolysis of the polyester resin which has a depetroleum-type material as a structural component. The component (B) used in the present invention can reduce the amount of active hydrogen in the resin having a catalytic action of hydrolysis, for example. Further, for example, when an ester bond of a polyester resin having a petroleum-free material as a constituent component is hydrolyzed, a hydroxyl group and a carboxyl group are generated. The component (b) used in the present invention can recombine the hydrolyzed polymer chain by reacting with a hydroxyl group or a carboxyl group generated by hydrolysis. As a result, a decrease in physical properties due to hydrolysis of the polyester resin having the petroleum-free material as a constituent component is suppressed.

  The metal compound is not particularly limited as long as it carboxylates a carboxyl group generated by hydrolysis, and examples thereof include metal oxides, metal hydroxides, metal salts, and metal complexes. . Specific examples of metal components in such metal compounds include periodic tables of lithium, potassium, sodium, aluminum, zirconium, magnesium, calcium, barium, cesium, strontium, rubidium, zinc, copper, iron, tin, lead, and the like. Mention may be made of the metals of Groups I to VIII. Among these, sodium, magnesium, calcium, zirconium, zinc, and aluminum are preferable.

Specific examples of the metal oxide include CuO, MgO, BaO, ZnO, Al ₂ O ₃ , Fe ₂ O ₃ , SnO, CaO, and ZrO ₂ . Specific examples of the metal hydroxide include LiOH, NaOH, KOH, Cu (OH) ₂ , Mg (OH) ₂ , Ba (OH) ₂ , Zn (OH) ₂ , Sn (OH) ₂ , Ca ( OH) _{2 and the} like, and Mg (OH) ₂ is preferable. These metal compounds can be used individually by 1 type or in combination of 2 or more types.

  In addition, in this invention, the titanium oxide mix | blended in order to color a cover, and the calcium carbonate and barium sulfate used as a specific gravity regulator are not contained in the metal compound used as (B) component. To do.

  Examples of the carbodiimide compound include compounds having at least one carbodiimide group in the molecule. Such a carbodiimide compound may be aliphatic, alicyclic, or aromatic. For example, poly (4,4′-diphenylmethanecarbodiimide), poly (p-phenylenecarbodiimide), poly (m-phenylenecarbodiimide), Polycarbodiimide compounds such as poly (tolylcarbodiimide), poly (diisopropylphenylenecarbodiimide), poly (methyl-diisopropylphenylenecarbodiimide), poly (triisopropylphenylenecarbodiimide), dicyclohexylcarbodiimide, diisopropylcarbodiimide, dimethylcarbodiimide, diisobutylcarbodiimide, dioctylcarbodiimide, Examples thereof include monocarbodiimide compounds such as diphenylcarbodiimide and naphthylcarbodiimide.

The polyisocyanate is not particularly limited as long as it has two or more isocyanate groups. For example, 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, 2,4-toluene diisocyanate, and 2,6-toluene diisocyanate. (TDI), 4,4′-diphenylmethane diisocyanate (MDI), 1,5-naphthylene diisocyanate (NDI), 3,3′-vitrylene-4,4′-diisocyanate (TODI), xylylene diisocyanate (XDI) ), tetramethyl xylylene diisocyanate (TMXDI), aromatic polyisocyanates such as p-phenylene diisocyanate (PPDI); 4,4'-dicyclohexylmethane diisocyanate _(H 12 MDI), hydrogenated xylylene iso Shi Sulfonate _(H 6 XDI), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), 1 or a mixture of two or more of the alicyclic polyisocyanate, or an aliphatic polyisocyanate such as norbornene diisocyanate (NBDI) are Can be mentioned. Of these, non-yellowing polyisocyanates (TMXDI, XDI, HDI, H ₆ XDI, IPDI, H ₁₂ MDI, NBDI, etc.) are preferably used from the viewpoint of weather resistance.

  Examples of the oxazoline compound include 2-methoxy-2-oxazoline, 2-ethoxy-2-oxazoline, 2-propoxy-2-oxazoline, 2-butoxy-2-oxazoline, 2-pentyloxy-2-oxazoline, and 2-hexyl. Oxy-2-oxazoline, 2-heptyloxy-2-oxazoline, 2-octyloxy-2-oxazoline, 2-nonyloxy-2-oxazoline, 2-decyloxy-2-oxazoline, 2-cyclopentyloxy-2-oxazoline, 2 -Cyclohexyloxy-2-oxazoline, 2-allyloxy-2-oxazoline, 2-methallyloxy-2-oxazoline, 2-crotyloxy-2-oxazoline, 2-phenoxy-2-oxazoline, 2-cresyl-2-oxazoline, 2-o-E Phenoxy-2-oxazoline, 2-o-propylphenoxy-2-oxazoline, 2-o-phenylphenoxy-2-oxazoline, 2-m-ethylphenoxy-2-oxazoline, 2-m-propylphenoxy-2-oxazoline, 2-p-phenylphenoxy-2-oxazoline, 2-methyl-2-oxazoline, 2-ethyl-2-oxazoline, 2-propyl-2-oxazoline, 2-butyl-2-oxazoline, 2-pentyl-2-oxazoline 2-hexyl-2-oxazoline, 2-heptyl-2-oxazoline, 2-octyl-2-oxazoline, 2-nonyl-2-oxazoline, 2-decyl-2-oxazoline, 2-cyclopentyl-2-oxazoline, 2 -Cyclohexyl-2-oxazoline, 2-allyl-2-oxy Zoline, 2-methallyl-2-oxazoline, 2-crotyl-2-oxazoline, 2-phenyl-2-oxazoline, 2-o-ethylphenyl-2-oxazoline, 2-o-propylphenyl-2-oxazoline, 2- o-phenylphenyl-2-oxazoline, 2-m-ethylphenyl-2-oxazoline, 2-m-propylphenyl-2-oxazoline, 2-p-phenylphenyl-2-oxazoline, 2,2′-bis (2 -Oxazoline), 2,2'-bis (4-methyl-2-oxazoline), 2,2'-bis (4,4'-dimethyl-2-oxazoline), 2,2'-bis (4-ethyl- 2-oxazoline), 2,2′-bis (4,4′-diethyl-2-oxazoline), 2,2′-bis (4-propyl-2-oxazoline), 2,2′-bis (4 -Butyl-2-oxazoline), 2,2'-bis (4-hexyl-2-oxazoline), 2,2'-bis (4-phenyl-2-oxazoline), 2,2'-bis (4- Cyclohexyl-2-oxazoline), 2,2′-bis (4-benzyl-2-oxazoline), 2,2′-p-phenylenebis (2-oxazoline), 2,2′-m-phenylenebis ( 2-oxazoline), 2,2′-o-phenylenebis (2-oxazoline), 2,2′-p-phenylenebis (4-methyl-2-oxazoline), 2,2′-p-phenylenebis (4 , 4′-dimethyl-2-oxazoline), 2,2′-m-phenylenebis (4-methyl-2-oxazoline), 2,2′-m-phenylenebis (4,4′-dimethyl-2-oxazoline) ), 2,2′-ethylenebis (2-oxa Phosphorus), 2,2′-tetramethylenebis (2-oxazoline), 2,2′-hexamethylenebis (2-oxazoline), 2,2′-octamethylenebis (2-oxazoline), 2,2′- Decamethylene bis (2-oxazoline), 2,2′-ethylene bis (4-methyl-2-oxazoline), 2,2′-tetraethylene bis (4,4′-dimethyl-2-oxazoline), 2,2 Examples include '-9,9'-diphenoxyethanebis (2-oxazoline), 2,2'-cyclohexylenebis (2-oxazoline), 2,2'-diphenylenebis (2-oxazoline), and the like.

  Examples of the organic peroxide include dicumyl peroxide, benzoyl peroxide, di-t-butyl peroxide, cumene hydroperoxide, succinic acid peroxide, di (2-ethoxyethyl) peroxydicarbonate, (α, α′-bis-neodecanoylperoxy) diisopropylbenzene, cumylperoxyneodecanoate, 1,1,3,3-tetramethylbutylperoxyneodecanoate, 1-cyclohexyl-1-methylethylper Oxyneodecanoate, t-hexylperoxyneodecanoate, t-butylperoxyneodecanoate, t-hexylperoxypivalate, t-butylperoxyneohexanoate, t-amylperoxy- 2-ethylhexanoate, t-butyl peroxypivalate, t-a Milperoxypivalate, 1,1,3,3-tetramethylbutylperoxy-2-ethylhexanoate, 2,5-dimethyl-2,5-bis (2-ethylhexanoylperoxy) hexane, 1-cyclohexyl-1-methylethylperoxy-2-ethylhexanoate, t-hexylperoxy-2-ethylhexanoate, t-butylperoxy-2-ethylhexanoate, t-butylperoxyiso Butyrate, t-hexylperoxyisopropyl monocarbonate, t-butylperoxy 3,5,5-tri-methylhexanoate, t-butylperoxylaurate, 2,5-dimethyl-2,5-bis ( m-toluoyl peroxy) hexane, t-butylperoxyisopropyl monocarbonate, t-butylperoxy -Ethylhexyl monocarbonate, t-hexyl peroxybenzoate, 2,5-dimethyl-2,5-bis (benzoylperoxy) hexane, t-butyl peroxyacetate, t-butyl peroxy m-toluoyl benzoate, t- Butyl peroxybenzoate, bis-t-butylperoxyisophthalate, 2,4,4-trimethylpentylperoxy-phenoxyacetate, di-t-butylperoxyhexahydroterephthalate, di-t-butylperoxyazelate, And di-t-butylperoxy-trimethyladipate. These organic peroxides may be used alone or in combination of two or more. Among these, dicumyl peroxide, t-butylperoxyneodecanoate, t-hexylperoxyneodecanoate, t-butylperoxypivalate, t-amylperoxypivalate, t-hexylperoxy Pivalate, t-butylperoxy-2-ethylhexanoate, t-butylperoxyisobutyrate and the like are preferable.

  As said epoxy compound, the compound which has at least 1 or more epoxy group in a molecule | numerator can be mentioned, More preferably, it is a compound which has at least 2 or more epoxy group in a molecule | numerator. Specifically, epoxidized soybean oil, epoxidized linseed oil, epoxy butyl stearate, epoxy octyl stearate, phenyl glycidyl ether, allyl glycidyl ether, p-butylphenyl glycidyl ether, styrene oxide, neohexene oxide, adipine Acid diglycidyl ester, sebacic acid diglycidyl ester, phthalic acid diglycidyl ester, bis-epoxy dicyclopentadienyl ether, ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, butadiene diepoxide, tetra Phenylethylene epoxide, epoxidized polybutadiene, epoxidized styrene-butadiene copolymer, epoxidized hydrogenated styrene-butadiene Copolymer, bisphenol-A type epoxy compound, bisphenol-S type epoxy compound, phenol novolak type epoxy compound, resorcinol type epoxy compound, 3,4-epoxycyclohexamethyl-3,4-epoxycyclohexyl carboxylate, or 3 An alicyclic epoxy compound such as 1,4-epoxycyclohexyl glycidyl ether can be exemplified.

  In the present invention, the content of the component (B) contained in the cover is preferably 0.1 parts by mass or more, and more preferably 0.2 parts by mass or more with respect to 100 parts by mass of the petroleum-free polyester resin component. 0.3 parts by mass or more is more preferable, 20 parts by mass or less is preferable, 15 parts by mass or less is more preferable, and 12 parts by mass or less is more preferable. When the content of the component (B) is less than 0.1 parts by mass, the hydrolysis suppressing effect by the component (B) is not sufficient, and the effect of improving the scratch resistance and durability may not be sufficient. Moreover, when content of (B) component exceeds 20 mass parts, the hydrolysis inhibitory effect by (B) component is too strong, and there exists a tendency for the fluidity | liquidity of the composition for a cover to fall. As a result, it is difficult to form the cover.

  The cover of the golf ball of the present invention includes the above-mentioned (A) resin component, (B) component, compatibilizer, pigment components such as white pigment (titanium oxide) and blue pigment, specific gravity such as calcium carbonate and barium sulfate. You may contain a regulator, a dispersing agent, anti-aging agent, a ultraviolet absorber, a light stabilizer, a fluorescent material, or a fluorescent brightening agent in the range which does not impair the performance of a cover.

  The content of the white pigment (titanium oxide) is 0.5 parts by mass or more, more preferably 1 part by mass or more, and more preferably 10 parts by mass or less, with respect to 100 parts by mass of the resin component constituting the cover. Is desirably 8 parts by mass or less. By setting the content of the white pigment to 0.5 parts by mass or more, the cover can be concealed. Moreover, it is because durability of the cover obtained may fall when content of a white pigment exceeds 10 mass parts.

  The cover of the golf ball of the present invention is produced by molding using the cover composition containing the cover material described above. As a method of forming the cover, for example, a method of forming a hollow shell-shaped shell from the cover composition, and covering and compressing the core with a plurality of shells (preferably, forming the cover from the cover composition into a hollow shell-shaped shell). And a method in which a half shell is molded, the core is covered with two half shells and compression molded), and a cover composition is directly injection molded on the core. When forming a cover by directly injection-molding the cover composition onto the core, the upper and lower molds for cover molding have a hemispherical cavity, a hold pin that has pimples and a part of the pimples can be advanced and retracted. It is preferable to use what is also used. The cover can be formed by injection molding by projecting the hold pin, inserting and holding the core, injecting the cover composition, and cooling the cover, for example, 9 MPa to 15 MPa. The cover composition heated to 200 ° C. to 250 ° C. is poured into the mold clamped at a pressure of 0.5 to 5 seconds, cooled for 10 to 60 seconds, and opened.

  The golf ball formed with the cover is preferably removed from the mold and subjected to surface treatment such as deburring, washing, and sand blasting as necessary. Moreover, a paint layer and a mark can also be formed if desired.

  In the present invention, the thickness of the golf ball cover is preferably 3.0 mm or less, more preferably 2.8 mm or less, and even more preferably 2.5 mm or less. This is because when the thickness is 3.0 mm or less, resilience and feel at impact are improved. Although the minimum of the thickness of a cover is not specifically limited, For example, 0.3 mm is preferable, 0.5 mm is preferable and 1.0 mm is more preferable. This is because if it is less than 0.3 mm, it may be difficult to mold the cover. In addition, the durability and wear resistance of the cover may be reduced.

  The slab hardness of the golf ball cover of the present invention is 40 or more in Shore D hardness, more preferably 45 or more, further preferably 50 or more, 70 or less, more preferably 68 or less. Yes, more preferably 65 or less. By setting the slab hardness of the cover to 40 or more, the rigidity of the obtained cover is increased, and a golf ball having excellent resilience (flying distance) can be obtained. On the other hand, when the slab hardness is 70 or less, the durability is further improved. Here, the slab hardness of the cover is a hardness measured by molding the cover composition into a sheet shape, and is measured by a measurement method described later.

  The golf ball of the present invention is a golf ball having a core and a cover covering the core, wherein at least one of the core and the cover includes (A) a resin component and the above-described petroleum-free material as a constituent component. It is not particularly limited as long as it contains at least one selected from the group consisting of a polyester resin having (B) a metal compound, a carbodiimide, a polyisocyanate, an organic peroxide, an oxazoline compound, and an epoxy compound, A preferred embodiment of the present invention is a two-piece golf ball having a core and a cover covering the core, wherein the cover contains the component (A) and the component (B), or the center and the A sleeve having a core composed of an intermediate layer covering the center and an outermost layer cover covering the core. A peace golf ball, wherein at least one of the intermediate layer and the cover contains the component (A) and the component (B), a core comprising a center and a plurality of or multiple intermediate layers covering the center; A multi-piece golf ball having an outermost layer cover covering the core, wherein at least one of the intermediate layer or the outermost layer cover contains the component (A) and the component (B), and a wound core And a cover that covers the wound core, wherein the cover includes an (A) component and a (B) component. In particular, an embodiment in which the cover of the golf ball contains the component (A) and the component (B) is preferable. This is because when the cover contains the component (A) and the component (B), the durability and scuff resistance of the obtained golf ball are further improved.

  Next, the core or center in the golf ball of the present invention will be described. For the core or the center, a conventionally known rubber composition (hereinafter sometimes simply referred to as “core rubber composition”) can be employed. For example, base rubber, co-crosslinking agent, crosslinking initiator And a rubber composition containing a filler can be formed by hot pressing.

  As the base rubber, natural rubber and / or synthetic rubber can be used. For example, polybutadiene rubber, natural rubber, polyisoprene rubber, styrene polybutadiene rubber, ethylene-propylene-diene rubber (EPDM) and the like can be used. Among these, it is particularly preferable to use a high-cis polybutadiene having a cis bond advantageous for repulsion of 40% or more, preferably 70% or more, more preferably 90% or more.

  As the crosslinking initiator, an organic peroxide can be suitably used. Examples of the organic peroxide include dicumyl peroxide, 1,1-bis (t-butylperoxy) -3,5-trimethylcyclohexane, 2,5-dimethyl-2,5-di (t-butyl). Peroxy) Organic peroxides such as hexane and di-t-butyl peroxide are exemplified, and among them, dicumyl peroxide is preferably used. The compounding amount of the organic peroxide is 0.3 parts by mass or more, more preferably 0.4 parts by mass or more and 5 parts by mass or less, more preferably 3 parts by mass with respect to 100 parts by mass of the base rubber. The following is desirable. If the amount is less than 0.3 parts by mass, the core tends to be too soft and the resilience tends to decrease. If the amount exceeds 5 parts by mass, the core becomes too hard and the feel at impact is reduced.

  As the co-crosslinking agent, an α, β-unsaturated carboxylic acid having 3 to 8 carbon atoms or a metal salt thereof can be used. Examples of the metal constituting the metal salt include zinc, magnesium, calcium, aluminum, and sodium, and zinc is preferably used because resilience increases. Preferable examples of the α, β-unsaturated carboxylic acid or a metal salt thereof include acrylic acid, methacrylic acid, zinc acrylate, and zinc methacrylate.

  The amount of the co-crosslinking agent used is 10 parts by mass or more, more preferably 15 parts by mass or more, still more preferably 20 parts by mass or more, and more preferably 55 parts by mass or less, relative to 100 parts by mass of the base rubber. Is preferably 50 parts by mass or less, more preferably 48 parts by mass or less. When the amount of co-crosslinking agent used is less than 10 parts by mass, the amount of organic peroxide used must be increased in order to obtain an appropriate hardness, and the resilience tends to decrease. On the other hand, when the usage-amount of a co-crosslinking agent exceeds 55 mass parts, a core may become hard too much and there exists a possibility that a shot feeling may fall.

  The filler may be any compound that is usually blended in the core of a golf ball, such as an inorganic salt (specifically, zinc oxide, barium sulfate, calcium carbonate, etc.), high specific gravity metal powder (eg, tungsten powder, molybdenum). Powders and the like) and mixtures thereof. The blending amount of the filler is 0.5 parts by mass or more, preferably 1 part by mass or more, and 30 parts by mass or less, preferably 20 parts by mass or less with respect to 100 parts by mass of the base rubber. desirable. When the amount is less than 0.5 parts by mass, it is difficult to adjust the specific gravity and an appropriate weight cannot be obtained. When the amount exceeds 30 parts by mass, the rubber fraction of the entire core is reduced and the resilience is lowered.

  In addition to the base rubber, co-crosslinking agent, organic peroxide, and filler, the core rubber composition further contains an organic sulfur compound, an antioxidant, a peptizer, or the like as appropriate. be able to.

  As the organic sulfur compound, diphenyl disulfides can be preferably used. The compounding amount of diphenyl disulfides is preferably 0.1 parts by mass or more, more preferably 0.3 parts by mass or more, and preferably 5.0 parts by mass or less, with respect to 100 parts by mass of the base rubber. Preferably it is 3.0 mass parts or less. Examples of the diphenyl disulfides include diphenyl disulfide; bis (4-chlorophenyl) disulfide, bis (3-chlorophenyl) disulfide, bis (4-bromophenyl) disulfide, bis (3-bromophenyl) disulfide, bis (4- Mono-substituted products such as fluorophenyl) disulfide, bis (4-iodophenyl) disulfide, bis (4-cyanophenyl) disulfide; bis (2,5-dichlorophenyl) disulfide, bis (3,5-dichlorophenyl) disulfide, bis ( 2,6-dichlorophenyl) disulfide, bis (2,5-dibromophenyl) disulfide, bis (3,5-dibromophenyl) disulfide, bis (2-chloro-5-bromophenyl) disulfide, bis (2-cyano- -Disubstituted products such as bromophenyl) disulfide; trisubstituted products such as bis (2,4,6-trichlorophenyl) disulfide and bis (2-cyano-4-chloro-6-bromophenyl) disulfide; Tetra-substituted products such as 3,5,6-tetrachlorophenyl) disulfide; bis (2,3,4,5,6-pentachlorophenyl) disulfide, bis (2,3,4,5,6-pentabromophenyl) disulfide And the like, and the like. These diphenyl disulfides can affect the vulcanization state of the rubber vulcanizate and increase the resilience. Among these, it is preferable to use diphenyl disulfide and bis (pentabromophenyl) disulfide from the viewpoint that a highly repulsive golf ball can be obtained. The blending amount of the anti-aging agent is preferably 0.1 parts by mass or more and 1 part by mass or less with respect to 100 parts by mass of the base rubber. Moreover, it is preferable that a peptizer is 0.1 to 5 mass parts with respect to 100 mass parts of base rubber.

  The hot-press molding conditions for the core rubber composition may be appropriately set according to the rubber composition, but are usually heated at 130 to 200 ° C. for 10 to 60 minutes, or at 130 to 150 ° C. for 20 to 40 minutes. After heating, it is preferable to perform two-step heating at 160 to 180 ° C. for 5 to 15 minutes.

  Examples of the core structure include a single-layer core, a core composed of a center and a single-layer intermediate layer covering the center, and a core composed of a center and a plurality of or multiple intermediate layers covering the center. be able to. The core shape is preferably spherical. When the core shape is not spherical, the thickness of the cover is not uniform. As a result, a part in which the cover performance is partially reduced occurs. On the other hand, the shape of the center is generally spherical, but a ridge may be provided so as to divide the surface of the spherical center, for example, the ridge so as to divide the surface of the spherical center equally. May be provided. As an aspect which provides the said protrusion, the aspect which provides a protrusion integrally with a center on the surface of a spherical center, the aspect which provides the intermediate | middle layer of a protrusion on the surface of a spherical center, etc. can be mentioned, for example.

  For example, when the spherical center is regarded as the earth, the ridge is preferably provided along an equator and an arbitrary meridian that equally divides the surface of the spherical center. For example, when the spherical center surface is divided into 8 parts, 90 degrees east longitude, 90 degrees west longitude, and east longitude (west longitude) with reference to the equator, an arbitrary meridian (longitude 0 degrees), and the meridian of such longitude 0 degrees It may be provided along the meridian of 180 degrees. When providing the ridge, the concave portion partitioned by the ridge is filled with a plurality of intermediate layers or a single intermediate layer covering each of the concave portions, and the shape of the core is made spherical. It is preferable to do so. The shape of the protrusion is not particularly limited, and examples thereof include an arc shape or a substantially arc shape (for example, a shape in which cut portions are provided at portions that intersect or perpendicular to each other).

  Examples of the material constituting the intermediate layer include petroleum-based thermoplastic resins such as polyurethane resin, ionomer resin, polyamide resin, polystyrene resin, polyethylene resin, and polyester resin in addition to the above-described petroleum-free polyester resin. . Specifically, the same thing as the specific example of the other petroleum-type thermoplastic resin which the cover of the golf ball of this invention contains can be used. In addition to the resin component, the intermediate layer may further contain a specific gravity adjusting agent such as barium sulfate or tungsten, an antiaging agent, a pigment, and the like.

  The core used in the golf ball of the present invention has a diameter of 36.8 mm or more, preferably 37.2 mm or more, more preferably 37.6 mm or more, 42.2 mm or less, preferably 41.2 mm or less, more preferably 40. It is preferable to be 8 mm or less. If the core diameter is less than the above lower limit, the cover will be too thick and the rebound will be reduced.On the other hand, if the core diameter exceeds the upper limit, the cover will be too thin. This is because molding becomes difficult.

  When the core has a diameter of 36.8 mm to 42.2 mm, the amount of compressive deformation (the amount by which the golf ball shrinks in the compression direction) from when the initial load 98 N is applied to when the final load 1275 N is applied is 2.0 mm. More preferably, it is 2.1 mm or more, more preferably 2.3 mm or more, 5.0 mm or less, more preferably 4.7 mm or less, and further preferably 4.5 mm or less. When the amount of compressive deformation is less than 2.0 mm, the feel at impact is hard and worse, and when it exceeds 5.0 mm, the resilience may be lowered.

  It is also preferable to use a core having a surface hardness greater than the center hardness (when the core is a multilayer core, the outermost layer has a surface hardness greater than the center hardness). By making the surface hardness of the core greater than the center hardness, the launch angle is increased, the spin rate is decreased, and the flight distance is improved. From this viewpoint, the hardness difference between the surface and the center of the core used in the golf ball of the present invention is preferably 20 or more, more preferably 25 or more, preferably 40 or less, and more preferably 35 or less. If the difference in hardness is less than the lower limit, it is difficult to achieve a high launch angle and a low spin rate, so the flight distance tends to decrease. Moreover, since the impact force at the time of hitting becomes large, it is difficult to obtain a soft and good shot feeling. On the other hand, when the hardness difference exceeds the above upper limit, the durability tends to decrease.

  The core has a Shore D hardness of 30D or more, preferably 32D or more, more preferably 35D or more, and is preferably 50D or less, preferably 48D or less, more preferably 45D or less. If the central hardness is less than the above lower limit, it tends to be too soft and the resilience tends to decrease, and if it exceeds the above upper limit, it becomes too hard and the feel at impact and the launch angle are reduced, and the spin rate is also high. Increases flight performance. In the present invention, the center hardness of the core means the hardness measured by a spring type hardness tester Shore D type at the center point of the cut surface after cutting the core into two equal parts.

  The core has a Shore D hardness of 45D or more, preferably 50D or more, more preferably 55D or more, and 65D or less, preferably 62D or less, more preferably 60D or less. If the surface hardness is smaller than the above lower limit, it may become too soft, resulting in a decrease in resilience and a launch angle, or a spin amount may increase and flight performance may decrease. If the surface hardness is larger than the above upper limit, it may become too hard and the feel at impact may be reduced. In the present invention, the surface hardness of the core means the hardness measured with the spring type hardness meter Shore D type on the surface of the obtained spherical core. Further, when the core has a multilayer structure, the surface hardness of the core means the hardness of the surface of the outermost layer of the core.

  When the golf ball of the present invention is a thread wound golf ball, a thread wound core may be used as the core. In such a case, as the thread wound core, for example, a thread core composed of a center formed by curing the core rubber composition described above and a thread rubber layer formed by winding the thread rubber around the center in a stretched state is used. do it. The thread rubber wound on the center may be the same as that conventionally used for the thread wound layer of a thread wound golf ball, for example, natural rubber or natural rubber and synthetic polyisoprene with sulfur, You may use what was obtained by vulcanizing | curing the rubber composition which mix | blended the vulcanization | cure adjuvant, the vulcanization accelerator, anti-aging agent, etc. The thread rubber is stretched about 10 times on the center and wound to form a thread wound core.

  When the golf ball of the present invention has a diameter of 42.67 mm to 43 mm, the amount of compressive deformation (the amount by which the golf ball shrinks in the compression direction) from when the initial load 98N is applied to when the final load 1275N is applied is 2. 0 mm or more, more preferably 2.1 mm or more, further preferably 2.3 mm or more, 3.5 mm or less, more preferably 3.3 mm or less, and further preferably 3.2 mm or less. It is desirable. When the amount of compressive deformation is less than 2.0 mm, the feel at impact is hard and worse, and when it exceeds 3.5 mm, the resilience may be lowered.

  Hereinafter, the present invention will be described in detail by way of examples. However, the present invention is not limited to the following examples, and all modifications and embodiments without departing from the gist of the present invention are not limited thereto. Included in range.

[Evaluation methods]
(1) Scratch resistance A commercially available pitching wedge was attached to a swing robot manufactured by True Temper, and the ball was hit once at two locations at a head speed of 36 m / sec. .
Evaluation criteria ○: The surface of the golf ball has little or no surface damage.
(Triangle | delta): The surface of the golf ball is shaved a little and fuzz has arisen.
X: The surface of the golf ball is considerably shaved and the fuzz is conspicuous.

(2) Durability A metal head # W1 driver (SIO Sports XXIO S 10 degrees) is attached to a swing robot manufactured by Trutemper, and each golf ball is hit at a head speed of 45 m / sec to collide with a collision plate. It was. This was repeated to measure the number of hits until the golf ball was broken. The durability of each golf ball is determined by golf ball No. The number of hits of 9 is assumed to be 100, and the number of hits for each golf ball is shown as an index value. The larger the indexed value, the more excellent the golf ball is.

(3) Slab hardness (Shore A hardness or Shore D hardness)
Using the cover composition, a sheet having a thickness of about 2 mm was produced by hot press molding and stored at 23 ° C. for 2 weeks. Automatic rubber hardness manufactured by Kobunshi Keiki Co., Ltd. equipped with a spring type hardness meter Shore A or D type as defined in ASTM-D2240 in a state where three or more sheets are stacked so as not to affect the measurement substrate or the like. It measured using the total P1 type | mold.

(4) Compression deformation (mm)
The amount of deformation in the compression direction (the amount by which the golf ball or core contracts in the compression direction) from when the initial load 98N was applied to the golf ball or core to when the final load 1275N was applied was measured.

(5) Core hardness JIS-C hardness measured on the surface portion of the spherical core was defined as the surface hardness of the core using a spring type hardness meter C type defined in JIS-K 6301, and the spherical core was cut into a hemisphere, The JIS-C hardness measured at the center of the cut surface was taken as the center hardness of the core.

[Production of golf balls]
(1) Production of Core A rubber center composition having the composition shown in Table 1 was kneaded and heated and pressed at 170 ° C. for 15 minutes in an upper and lower mold having hemispherical cavities to obtain a spherical center. When producing a two-piece golf ball, the spherical center was used as a core as it was.

  When producing a three-piece golf ball, the intermediate layer material having the composition shown in Table 1 was mixed with a biaxial kneading type extruder to prepare a pellet-shaped intermediate layer composition. Extrusion was performed with a screw diameter of 45 mm, a screw speed of 200 rpm, and a screw L / D = 35. The blend was heated to 150-230 ° C. at the die position of the extruder. The obtained intermediate layer composition was injection-molded on the center obtained as described above to produce a multilayer core having a center and an intermediate layer (thickness 1 mm) covering the center.

BR730: High cis polybutadiene (cis content 96% or more) manufactured by JSR Corporation
BR-51: High cis polybutadiene (cis content 96% or more) manufactured by JSR Corporation
IR-2200: Isoprene rubber manufactured by Nippon Zeon (cis content 98% or more)
Zinc acrylate: ZNDA-90S manufactured by Nippon Distilled
Zinc Oxide: Toho Zinc Gin R
Dicumyl peroxide: Park Mill D made by NOF
Diphenyl disulfide: Barium sulfate manufactured by Sumitomo Seika: Barium sulfate BD manufactured by Sakai Chemical
High Milan 1605: Sodium ion neutralized ethylene-methacrylic acid copolymer ionomer resin manufactured by Mitsui DuPont Polychemical Co., Ltd. High Milan AM7329: Zinc ion neutralized ethylene-methacrylic acid copolymer ionomer resin manufactured by Mitsui DuPont Polychemical

(2) Preparation of Cover Composition and Production of Golf Ball Body Next, the cover material having the composition shown in Table 2 was mixed with a twin-screw kneading extruder to prepare a pellet-shaped cover composition. . Extrusion was performed with a screw diameter of 45 mm, a screw speed of 200 rpm, and a screw L / D = 35. The blend was heated to 150-230 ° C. at the die position of the extruder. Subsequently, the obtained cover composition was directly injection-molded on the core to produce a cover covering the core. The cover molding upper and lower molds have hemispherical cavities, are attached with pimples, and also serve as hold pins in which a part of the pimples can advance and retract. The hold pin is protruded, the core is inserted and then held, and a resin heated to 210 ° C. is injected into a mold clamped at a pressure of 80 tons in 0.3 seconds, cooled for 30 seconds, and the mold is opened to open a golf ball Was taken out. The surface of the obtained golf ball body is subjected to sand blasting and marking, and then a clear paint is applied, and the paint is dried in an oven at 40 ° C. to obtain a golf ball having a diameter of 42.7 mm and a mass of 45.4 g. Obtained.

  The results of evaluating the scratch resistance, durability, and amount of compressive deformation of the obtained golf ball are shown in Table 2.

Non-petroleum polyester resin 1: butanediol / succinic acid (depetroleum-based material) / adipic acid copolymer polyester resin (polybutylene succinate adipate)
Non-petroleum polyester resin 2: Butanediol / succinic acid (depetroleum material) copolymer polyester resin (polybutylene succinate)
Lacia H100-J: manufactured by Mitsui Chemicals, polylactic acid resin Lacia M-151S Q52: manufactured by Mitsui Chemicals, a mixture of polylactic acid resin and aliphatic dicarboxylic acid polyester resin Cell Green: manufactured by Daicel Chemical Industries, Ltd., Cell Green CBS171 (Butanediol / succinic acid / caprolactone), but all components are made of non-deoiled materials.
High Milan 1605: Sodium ion neutralized ethylene-methacrylic acid copolymer ionomer resin manufactured by Mitsui DuPont Polychemical Co., Ltd. High Milan 1557: Zinc ion neutralized ethylene-methacrylic acid copolymer ionomer resin manufactured by Mitsui DuPont Polychemical Co., Ltd. Carbodiimide: Nisshinbo Carbodilite LA-1
Metal oxide: Magnesium hydroxide (Mg (OH) ₂ ) manufactured by Wako Pure Chemical Industries, Ltd.
Color powder: Ultramarine Blue

  Golf ball no. 1-No. 3 is a golf ball having a core and a cover covering the core, wherein at least one of the core and the cover is (A) a polyester resin having a petroleum-free material as a constituent component as a resin component; B) A case of containing at least one selected from the group consisting of metal compounds, carbodiimides, polyisocyanates, organic peroxides, oxazoline compounds, and epoxy compounds. It turns out that all are excellent in abrasion resistance and durability. Golf ball no. 4 and no. 5 is a case where the cover contains only the polyester resin having the petroleum-free material as a constituent component as the resin component (A), but the scuff resistance was lowered. Golf ball no. 6 is a case where caprolactone which does not use a petroleum-free material is used alone as the resin component (A) of the cover, but golf ball No. 6 using an ionomer resin which has been conventionally used. Compared to 9, the durability decreased. Golf ball no. 7 is a case where a mixture of a polylactic acid resin and an aliphatic carboxylic acid was used as the resin component of the cover, but a practical level of durability could not be obtained. Golf ball no. 8 is a case where a polylactic acid resin is used as the resin component of the cover. As in the case of No. 7, durability at a practical level could not be obtained.

  According to the present invention, it is possible to improve the durability and scuff resistance of a golf ball using a petroleum-free material.

Claims (6)

  A golf ball having a core and a cover covering the core, wherein at least one of the core and the cover is (A) a polyester resin having a petroleum-free material as a constituent component as a resin component, and (B) a metal A golf ball comprising: a compound, a carbodiimide, a polyisocyanate, an organic peroxide, an oxazoline compound, and at least one selected from the group consisting of epoxy compounds.   The polyester resin has (a) dicarboxylic acid, (b) diol and / or hydroxycarboxylic acid as a constituent component, and (a) at least one of dicarboxylic acid, (b) diol and / or hydroxycarboxylic acid. The golf ball according to claim 1, wherein the golf ball is a petroleum-free material.   The golf ball according to claim 1, wherein the slab hardness of the polyester resin is 70 or less in Shore D hardness.   The golf ball according to claim 1, wherein the cover contains a metal compound or carbodiimide as the component (B).   The golf ball according to claim 1, wherein the metal compound is a metal oxide or a metal hydroxide.   The golf ball according to claim 1, wherein the content of the component (B) contained in the cover is 0.1 to 20 parts by mass with respect to 100 parts by mass of the polyester resin. .