JP3825863B2 - Solid golf balls - Google Patents

Description

（式中、Ｒはチオール基および/またはハロゲン元素である）
を有する有機硫黄化合物を含有するゴム組成物を加硫して得られることを特徴とするソリッドゴルフボールに関する。
【００１１】
以下、本発明について更に詳述すると、本発明のソリッドゴルフボールに用いられるコアは、基材ゴム、α,β-不飽和カルボン酸の金属塩、共架橋開始剤、酸化亜鉛および有機硫黄化合物、必要に応じて充填材等を含有するゴム組成物を、通常のロール等の適宜の混練機を用いて混練し、所定の金型にて140〜170℃、90〜120kgf/cm²で10〜40分間加熱加圧成形することにより得られる。
【００１２】
基材ゴムとしては、従来からソリッドゴルフボールに用いられている天然ゴムおよび/または合成ゴムが用いられ、特にシス-1,4-結合少なくとも40％以上、好ましくは80％以上を有するいわゆるハイシスポリブタジエンゴムが好ましく、所望により、天然ゴム、ポリイソプレンゴム、スチレンポリブタジエンゴム、ＥＰＤＭ等を配合してもよい。
【００１３】
共架橋剤として作用するα,β-不飽和カルボン酸の金属塩の例としては、アクリル酸、メタクリル酸、マレイン酸、フマル酸等のような炭素数３〜８個のα,β-不飽和カルボン酸の亜鉛塩等の一価または二価の金属塩が挙げられるが、高い反発性を付与するアクリル酸亜鉛が好適である。配合量は基材ゴム100重量部に対して、15〜40重量部、好ましくは25〜35重量部である。40重量部より多いと硬くなり過ぎて打撃時フィーリングが悪くなり、15重量部未満では、適当な硬さにするために共架橋開始剤の量を増加しなければならず反発が悪くなり飛距離が低下する。
【００１４】
共架橋開始剤の例としては、有機過酸化物、例えばジクミルパーオキサイド、1,1-ビス(t-ブチルパーオキシ)-3,5-トリメチルシクロヘキサン、2,5-ジメチル-2,5-ジ(t-ブチルパーオキシ)ヘキサン、t-ブチルパーオキサイド等が挙げられ、ジクミルパーオキサイドが好適である。配合量は基材ゴム100重量部に対して0.3〜５重量部、好ましくは1.0〜2.5重量部である。0.3重量部未満では軟らかくなり過ぎて反発が悪くなり飛距離が低下する。５重量部を越えると適切な硬さにするためにα,β-不飽和カルボン酸の金属塩の量を減少しなければならず反発が悪くなり飛距離が低下する。
【００１５】
本発明のソリッドゴルフボールの製造に用いられるゴム組成物には、上記のものに加えて以下の構造式：
【化３】

（式中、Ｒはチオール基またはハロゲン元素である）
を有する有機硫黄化合物を配合する。Ｒはチオール基(-ＳＨ)および/またはハロゲン元素（例えばＦ、Ｃl、Ｂr、Ｉ等）であり、ハロゲン元素の場合、Ｂr、Ｃlが好ましい。この有機硫黄化合物は、例えばＲがチオール基の場合には以下の構造式：
【化４】

を有する4,4'-チオジベンゼンチオールであり、ＲがＢrの場合には以下の構造式：
【化５】

を有する4,4'-ジブロモジフェニルスルフィドである。配合量は、基材ゴム100重量部に対して0.05〜5.0重量部、好ましくは0.1〜3.0重量部である。0.05重量部未満では加硫時における反応が過少となり、物性に影響を与えず、5.0重量部を越えても有機硫黄化合物の効果の向上はみられない。
【００１６】
更に本発明のゴルフボールのコアには、酸化亜鉛、老化防止剤、重量調整剤としての硫酸バリウム、またはしゃく解剤、その他ソリッドゴルフボールのコアの製造に通常使用し得る成分を適宜配合してもよい。
【００１７】
コアの外径は32.7〜40.7mm、好ましくは33.5〜40.0mmである。32.7mmより小さいと反発性能が低下して、飛距離が低下し、40.7mmより大きいと耐久性が低下する。また、所望の打撃時フィーリングを得るため、初荷重10kgをかけた状態から終荷重130kgをかけたときまでの変形量(コンプレッション)が2.0〜7.0mm、好ましくは2.5〜6.0mmである。2.0mmより小さいと硬過ぎて打撃時フィーリングが悪くなり、7.0mmより大きいと軟らかくなり過ぎて打撃耐久性が悪くなる。
【００１８】
本発明では、上記コア上にはカバーを被覆するが、そのカバーは単層構造はもとより、２層以上の多層構造であってもよい。カバー材料としては、アイオノマー、ポリエステル、ナイロン等を単独または２種以上混合して使用し得る。また、カバー厚さは、1.0〜5.0mmとすることが好ましい。
【００１９】
また、本発明において、上記カバー用組成物には、主成分としての上記樹脂の他に必要に応じて、硫酸バリウム等の充填材や二酸化チタン等の着色剤や、その他の添加剤、例えば分散剤、老化防止剤、紫外線吸収剤、光安定剤並びに蛍光材料または蛍光増白剤等を、ゴルフボールカバーによる所望の特性が損なわれない範囲で含有していてもよいが、通常、着色剤の配合量は0.1〜0.5重量部が好ましい。
【００２０】
本発明のカバー層は、ゴルフボールのカバーの形成に使用されている一般に公知の方法を用いて行うことができ、特に限定されるものではない。カバー用組成物を予め半球殻状のハーフシェルに成形し、それを２枚用いてコアを包み、130〜170℃で１〜15分間加圧成形するか、または上記カバー用組成物を直接コア上に射出成形してコアを包み込む方法を用いてもよい。カバーの厚さは1.0〜5.0mm、好ましくは1.2〜4.0mmである。1.0mmより小さいとボール全体の硬度が小さくなって反発係数が小さくなり、5.0mmより大きいとボール全体の硬度が大きくなってコントロール性と打撃時フィーリングが悪くなる。
【００２１】
カバー成形時、必要に応じて、ディンプルと呼ばれるくぼみを多数表面上に形成する。本発明のゴルフボールは美観を高め、商品価値を上げるために、通常ペイント仕上げ、マーキングスタンプ等を施されて市場に投入される。
【００２２】
本発明では、ボール反発性またはボール初速を維持しながら、コア硬度、ボール硬度を低下させ、打撃時フィーリングの良好なソリッドゴルフボールを提供し得る。
【００２３】
【実施例】
本発明を実施例を挙げて更に具体的に説明するが、これら実施例に限定されるものではない。
【００２４】
コアの作製
以下の表２（実施例）および表３（比較例）に示した配合のコア用ゴム組成物を混練し、金型内で加硫成形することにより直径39.0mmの球状ソリッドコアを得た。加硫条件としては、150℃で20分間加硫した。得られたコアのコンプレッションおよび反発係数を測定し、その結果を表２（実施例）および表３（比較例）に示した。試験方法は後記の通り行った。
【００２５】
（実施例１〜８および比較例１〜４）
次いで、上記の得られたコア上に、表１に示したカバー用組成物を射出成形してカバー層を形成し、表面にペイントを塗装して、外径42.7mmを有するツーピースソリッドゴルフボールを得た。得られたゴルフボールのコンプレッション、打撃時フィーリング、反発係数、飛距離(キャリー)および耐久性を評価し、その結果を以下の表２（実施例）および表３（比較例）に示した。試験方法は後記の通り行った。
【００２６】
【表１】

【００２７】
(注1)三井デュポンポリケミカル(株)製のナトリウムイオン中和エチレン-メタクリル酸共重合体系アイオノマー樹脂
(注2)三井デュポンポリケミカル(株)製の亜鉛イオン中和エチレン-メタクリル酸共重合体系アイオノマー樹脂
【００２８】
（試験方法）
▲１▼コアコンプレッション
コアに初期荷重10kgfを負荷した時の変形量を基準として、終荷重130kgfを負荷した時の圧縮変形量を測定した。
▲２▼コア反発係数
Ｒ＆Ａ初速測定機により、コアに198.4gの金属円筒物を40m/秒の速度で衝突させた時の衝突前後のボールおよび円筒物の速度を測定し、それぞれの速度および重量から算出した。
▲３▼ボールコンプレッション
Ｒ＆Ａ方式により測定した。
▲４▼フィーリング
プロやトップアマのゴルファー10人にアンケートを行い、良いと答えた人数により下記の判定基準で評価した。

▲５▼ボール反発係数
Ｒ＆Ａ初速測定機により、ボールに198.4gの金属円筒物を45m/秒の速度で衝突させた時の衝突前後のボールおよび円筒物の速度を測定し、それぞれの速度および重量から算出した。
▲６▼飛距離
ツルーテンパー社製スイングロボットにウッド１番クラブ（ドライバー）を取付け、ゴルフボールをヘッドスピード45m/秒で打撃し、キャリー（落下点までの飛距離）を測定した。
▲７▼耐久性
ツルーテンパー社製スイングロボットにウッド１番クラブ（ドライバー）を取付け、ゴルフボールをヘッドスピード45m/秒で打撃し、破壊が生じるまでの回数を調べた。その結果を比較例３の耐衝撃回数（破壊が生じるまでの回数）を100とした時の指数で示す。
【００２９】
（試験結果）
【表２】

【表３】

(注3)日本合成ゴム(株)製ハイシスポリブタジエン
(1,4-シス-ポリブタジエン含量：96％)
(注4)吉富製薬(株)製のヨシノックス425
【００３０】
以上の結果より、本発明の有機硫黄化合物を用いた実施例１および３、並びに実施例５および７のゴルフボールはコアおよびボールのコンプレッションの硬軟に関係なく、本発明の有機硫黄化合物を用いない比較例２および３と比べて、反発係数、飛距離および耐久性で優れた結果となった。また、本発明の有機硫黄化合物を用いたゴルフボールは、本発明の有機硫黄化合物以外の有機硫黄化合物を用いた比較例４のゴルフボールに比べても、反発係数、飛距離および耐久性で優れた結果となった。有機硫黄化合物を含有せず、アクリル酸亜鉛含有量の高い比較例１は、反発係数、飛距離および耐久性で優れるが、打撃時フィーリングが劣った。
【００３１】
【発明の効果】
本発明のソリッドゴルフボールは、ポリブタジエン等の基材ゴムに共架橋剤としてのα,β-不飽和カルボン酸の金属塩、共架橋開始剤を配合したコア用ゴム組成物に特定の有機硫黄化合物を用い、かつ130kgf荷重時のコアの変形量を特定範囲内に規定することにより、低硬度化し、優れた反発性能および飛行性能を有し、打撃時フィーリングを向上させ得たものである。一方、このような低硬度化に伴う反発係数の低下が、本発明の有機硫黄化合物を用いることにより抑制されるので、低硬度でありながら良好な反発性能および飛行性能を維持するものである。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a solid golf ball, and particularly to a solid golf ball having excellent flight performance and durability, and a good feeling when hit.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, solid golf balls such as two-piece golf balls in which a core is directly covered with a cover material, and multi-layer golf balls in which one or more intermediate layers are interposed between the core and the cover are commercially available. .
[0003]
In these golf balls, a core obtained by vulcanization molding of a rubber composition using polybutadiene as a base rubber is used. In addition, the rubber composition serving as the base of the core usually has an unsaturated bond such as a metal salt of α, β-unsaturated carboxylic acid as a co-crosslinking agent in order to improve the coefficient of restitution and impact resistance of the core. The thing which mix | blended the peroxide with a monomer as a co-crosslinking initiator is known. Vulcanized moldings with such compounding systems form a three-dimensional structure, so the core has moderate hardness and durability, and solid golf balls using this core have excellent durability and good flight performance. It is also known to show.
[0004]
By the way, as a solid golf ball, a two-piece golf ball was put on the market in 1982. However, due to its excellent flight performance and durability, it has been particularly favored by average class golfers. However, the two-piece golf ball has a drawback that the feeling at the time of hitting is significantly harder than that of a conventional wound golf ball. This shortcoming may be avoided by certain weak users such as elderly people and women, and improvements are desired. Therefore, as an attempt to improve the feeling at the time of hitting, the hardness of the core has been lowered and softened. However, such an attempt in the above-mentioned blending system improves the feeling at the time of hitting, but since the resilience performance is lowered, a sufficient flight distance as a golf ball is not obtained.
[0005]
On the other hand, in recent years, it is used not only by the above-mentioned subjects but also by professional golfers and top amateurs because of the excellent flight performance of the two-piece solid golf ball and the small variation of each ball. In professional golfers and top amateurs, not only the feeling at the time of hitting but also a suitable spin performance is required. However, the ionomer resin normally used for the cover material of two-piece solid golf balls uses a resin with high rigidity and high hardness to satisfy flight performance and durability, and the desired spin performance can be obtained. Absent.
[0006]
Therefore, golf balls using a resin having low rigidity and low hardness have been proposed as an attempt to improve such defects. However, when the rigidity and hardness of the cover are lowered, the spin performance is improved, but the resilience performance of the cover itself is lowered, and there is a problem that the flight performance satisfactory as a golf ball is not obtained.
[0007]
As disclosed in many patent documents such as JP-A-4-109970, attempts have been made to improve the feeling of hitting and further improve the resilience performance of the core by containing an organic sulfur compound. However, I was not satisfied and there was still room for improvement.
[0008]
[Problems to be solved by the invention]
The present invention solves the problems of the conventional solid golf ball as described above, reduces the core hardness and the ball hardness while maintaining the ball rebound or the initial velocity of the ball, and has a good feeling at the time of hitting. An object is to provide a solid golf ball.
[0009]
[Means for Solving the Problems]
As a result of intensive studies to achieve the above object, the inventors of the present invention have specified a rubber composition in which a metal salt of an α, β-unsaturated carboxylic acid as a co-crosslinking agent is blended with a base rubber such as polybutadiene. By using the organic sulfur compound in an amount of 0.05 to 5.0% by weight of the rubber component, it was found that a golf ball having excellent rebound performance can be obtained without impairing the hardness of the core, and the present invention has been completed. .
[0010]
That is, the present invention is a solid golf ball comprising a core and a cover formed on the core, the core comprising a base rubber, a metal salt of an α, β-unsaturated carboxylic acid, a co-crosslinking initiator, and the following: Structural formula:
[Chemical 2]

(Wherein R is a thiol group and / or a halogen element)
The present invention relates to a solid golf ball obtained by vulcanizing a rubber composition containing an organic sulfur compound having the following.
[0011]
Hereinafter, the present invention will be described in more detail. The core used in the solid golf ball of the present invention includes a base rubber, a metal salt of an α, β-unsaturated carboxylic acid, a co-crosslinking initiator, zinc oxide and an organic sulfur compound, A rubber composition containing a filler or the like as necessary is kneaded using an appropriate kneader such as a normal roll, and 140 to 170 ° C. and 90 to 120 kgf / cm ² in a predetermined mold. It can be obtained by heating and pressing for 40 minutes.
[0012]
As the base rubber, natural rubber and / or synthetic rubber conventionally used for solid golf balls is used, and in particular, so-called high cis having at least 40% or more, preferably 80% or more of cis-1,4-bonds. Polybutadiene rubber is preferable, and if desired, natural rubber, polyisoprene rubber, styrene polybutadiene rubber, EPDM, or the like may be blended.
[0013]
Examples of metal salts of α, β-unsaturated carboxylic acids that act as co-crosslinking agents include α, β-unsaturated having 3 to 8 carbon atoms such as acrylic acid, methacrylic acid, maleic acid, fumaric acid, etc. Monovalent or divalent metal salts such as zinc salts of carboxylic acids can be mentioned, and zinc acrylate imparting high resilience is preferred. The amount is 15 to 40 parts by weight, preferably 25 to 35 parts by weight, based on 100 parts by weight of the base rubber. If it exceeds 40 parts by weight, it will become too hard and the feeling at impact will be poor, and if it is less than 15 parts by weight, the amount of the co-crosslinking initiator must be increased in order to obtain an appropriate hardness, resulting in poor rebound and flying. The distance decreases.
[0014]
Examples of co-crosslinking initiators include organic peroxides such as dicumyl peroxide, 1,1-bis (t-butylperoxy) -3,5-trimethylcyclohexane, 2,5-dimethyl-2,5- Examples thereof include di (t-butylperoxy) hexane and t-butyl peroxide, and dicumyl peroxide is preferable. The amount is 0.3 to 5 parts by weight, preferably 1.0 to 2.5 parts by weight, based on 100 parts by weight of the base rubber. If it is less than 0.3 parts by weight, it becomes too soft and the rebound becomes worse and the flight distance decreases. If the amount exceeds 5 parts by weight, the amount of metal salt of α, β-unsaturated carboxylic acid must be reduced in order to obtain an appropriate hardness, resulting in poor rebound and reduced flight distance.
[0015]
In addition to the above, the rubber composition used in the production of the solid golf ball of the present invention has the following structural formula:
[Chemical 3]

(Wherein R is a thiol group or a halogen element)
An organic sulfur compound having R is a thiol group (—SH) and / or a halogen element (for example, F, Cl, Br, I, etc.), and in the case of a halogen element, Br and Cl are preferable. For example, when R is a thiol group, the organic sulfur compound has the following structural formula:
[Formula 4]

4,4'-thiodibenzenethiol having the following structure when R is Br:
[Chemical formula 5]

4,4′-dibromodiphenyl sulfide having The amount is 0.05 to 5.0 parts by weight, preferably 0.1 to 3.0 parts by weight, based on 100 parts by weight of the base rubber. If the amount is less than 0.05 parts by weight, the reaction during vulcanization is too small and does not affect the physical properties. Even if the amount exceeds 5.0 parts by weight, the effect of the organic sulfur compound is not improved.
[0016]
Furthermore, the golf ball core of the present invention is appropriately blended with zinc oxide, anti-aging agent, barium sulfate as a weight adjusting agent, or peptizer, and other components that can be normally used for the production of solid golf ball cores. Also good.
[0017]
The outer diameter of the core is 32.7 to 40.7 mm, preferably 33.5 to 40.0 mm. If it is smaller than 32.7 mm, the resilience performance will be reduced and the flight distance will be reduced. If it is larger than 40.7 mm, the durability will be reduced. Further, in order to obtain a desired feeling at the time of hitting, the amount of deformation (compression) from when the initial load is applied to 10 kg to when the final load is applied to 130 kg is 2.0 to 7.0 mm, preferably 2.5 to 6.0 mm. If it is smaller than 2.0 mm, it will be too hard and the feeling at impact will be poor, and if it is larger than 7.0 mm, it will become too soft and the durability to impact will be poor.
[0018]
In the present invention, a cover is coated on the core, but the cover may have a multilayer structure of two or more layers as well as a single layer structure. As the cover material, ionomers, polyesters, nylons and the like can be used alone or in admixture of two or more. The cover thickness is preferably 1.0 to 5.0 mm.
[0019]
Further, in the present invention, in addition to the resin as a main component, the cover composition may include a filler such as barium sulfate, a colorant such as titanium dioxide, and other additives such as a dispersion, as necessary. Agents, anti-aging agents, ultraviolet absorbers, light stabilizers and fluorescent materials or fluorescent brightening agents, etc. may be contained within the range in which the desired properties of the golf ball cover are not impaired. The blending amount is preferably 0.1 to 0.5 parts by weight.
[0020]
The cover layer of the present invention can be formed by a generally known method used for forming a golf ball cover, and is not particularly limited. The cover composition is pre-molded into a hemispherical half-shell, and the two cores are used to wrap the core and pressure-molded at 130-170 ° C. for 1-15 minutes, or the cover composition is directly cored A method of wrapping the core by injection molding may be used. The cover has a thickness of 1.0 to 5.0 mm, preferably 1.2 to 4.0 mm. If it is smaller than 1.0 mm, the hardness of the entire ball is reduced and the coefficient of restitution is reduced.
[0021]
When forming the cover, if necessary, a number of dimples called dimples are formed on the surface. The golf ball of the present invention is usually put on the market with a paint finish, a marking stamp, etc. in order to enhance the beauty and increase the commercial value.
[0022]
In the present invention, it is possible to provide a solid golf ball having a good feeling when hit by reducing the core hardness and the ball hardness while maintaining the ball resilience or the initial ball speed.
[0023]
【Example】
The present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples.
[0024]
Production of core A rubber composition for a core having the composition shown in Table 2 (Example) and Table 3 (Comparative Example) below was kneaded and vulcanized in a mold to obtain a diameter of 39.0 mm. A spherical solid core was obtained. As vulcanization conditions, vulcanization was performed at 150 ° C. for 20 minutes. The compression and coefficient of restitution of the obtained core were measured, and the results are shown in Table 2 (Example) and Table 3 (Comparative Example). The test method was performed as described later.
[0025]
(Examples 1-8 and Comparative Examples 1-4)
Next, on the obtained core, the cover composition shown in Table 1 is injection-molded to form a cover layer, and paint is applied to the surface to form a two-piece solid golf ball having an outer diameter of 42.7 mm. Obtained. The compression, feel at impact, coefficient of restitution, flight distance (carry) and durability of the obtained golf ball were evaluated, and the results are shown in Table 2 (Example) and Table 3 (Comparative Example) below. The test method was performed as described later.
[0026]
[Table 1]

[0027]
(Note 1) Sodium ion neutralized ethylene-methacrylic acid copolymer ionomer resin manufactured by Mitsui DuPont Polychemical Co., Ltd.
(Note 2) Zion ion neutralized ethylene-methacrylic acid copolymer ionomer resin manufactured by Mitsui DuPont Polychemical Co., Ltd. [0028]
(Test method)
(1) The amount of compressive deformation when a final load of 130 kgf was applied was measured based on the amount of deformation when an initial load of 10 kgf was applied to the core compression core.
(2) Core rebound coefficient R & A Initial velocity measuring machine measures the velocity of the ball and cylinder before and after the collision when 198.4g metal cylinder collides with the core at a speed of 40m / sec. Calculated from
(3) Measured by a ball compression R & A method.
(4) A questionnaire was sent to 10 feeling professionals and top amateur golfers. The number of respondents who answered that they were good was evaluated according to the following criteria.

(5) Ball rebound coefficient R & A Initial velocity measuring machine measures the velocity of the ball and cylinder before and after the collision when 198.4g metal cylinder collides with the ball at a speed of 45m / sec. Calculated from
(6) Flying distance A wood No. 1 club (driver) was attached to a swing robot manufactured by True Temper, a golf ball was hit at a head speed of 45 m / sec, and a carry (a flying distance to a falling point) was measured.
(7) Durability A wood No. 1 club (driver) was attached to a swing robot manufactured by True Temper, and a golf ball was hit at a head speed of 45 m / sec. The result is shown as an index when the number of impact resistances (the number of times until fracture occurs) of Comparative Example 3 is taken as 100.
[0029]
(Test results)
[Table 2]

[Table 3]

(Note 3) Hysis polybutadiene manufactured by Nippon Synthetic Rubber Co., Ltd.
(1,4-cis-polybutadiene content: 96%)
(Note 4) Yoshinox 425 manufactured by Yoshitomi Pharmaceutical Co., Ltd.
[0030]
From the above results, the golf balls of Examples 1 and 3 and Examples 5 and 7 using the organic sulfur compound of the present invention do not use the organic sulfur compound of the present invention regardless of the hardness of the core and the compression of the ball. Compared to Comparative Examples 2 and 3, the results were excellent in the coefficient of restitution, flight distance, and durability. In addition, the golf ball using the organic sulfur compound of the present invention is superior in the coefficient of restitution, flight distance and durability as compared with the golf ball of Comparative Example 4 using an organic sulfur compound other than the organic sulfur compound of the present invention. It became the result. Comparative Example 1 containing no organic sulfur compound and having a high zinc acrylate content was excellent in the coefficient of restitution, flight distance, and durability, but was inferior in feeling upon impact.
[0031]
【The invention's effect】
The solid golf ball of the present invention includes a specific organic sulfur compound in a rubber composition for a core in which a base rubber such as polybutadiene is mixed with a metal salt of an α, β-unsaturated carboxylic acid as a co-crosslinking agent and a co-crosslinking initiator. And by defining the deformation amount of the core at a load of 130 kgf within a specific range, the hardness can be reduced, the rebound performance and the flight performance can be improved, and the feeling at impact can be improved. On the other hand, since the decrease in the coefficient of restitution associated with the reduction in hardness is suppressed by using the organic sulfur compound of the present invention, good rebound performance and flight performance are maintained while maintaining low hardness.

Claims (2)

A solid golf ball comprising a core and a cover formed on the core, the core comprising a base rubber, a metal salt of an α, β-unsaturated carboxylic acid, a co-crosslinking initiator and the following structural formula:

(Wherein R is a thiol group and / or a halogen element)
A solid golf ball obtained by vulcanizing a rubber composition containing an organic sulfur compound having The solid golf ball according to claim 1, wherein the compound contains 0.05 to 5.0 parts by weight with respect to 100 parts by weight of the base rubber.