JP2012081111A - Colored golf ball - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a colored golf ball having excellent spin performance and durability, an appearance excellent in visibility, fashionability and upscale image, and excellent weatherability.SOLUTION: The colored golf ball includes a core, a cover made of one or more layers that coat the core, and a paint layer applied to a surface of the outermost layer of the cover. In the golf ball, the outermost cover and/or the paint layer are/is stained with a fluorescent pigment and titanium oxide. The color tone of the golf ball itself in the case of a measurement hole diameter φ5 mm in a reflecting object measuring method based on JIS Z 8722 satisfies the conditions: 35≤L; -40≤a≤70; and -60≤b≤60 in the Lab chromatic system.

Description

  The present invention relates to a color golf ball having a fluorescent color. More specifically, the present invention has an excellent appearance in terms of spin performance, durability, visibility, fashionability and luxury, and weather resistance. The present invention relates to an excellent color golf ball.

  Recently, not only white golf balls but also various colored balls are on the market depending on the preference of golf players. In particular, as golf balls for women, color golf balls excellent in fashion and color golf balls with a high-class feeling have been developed.

On the other hand, with the recent multi-functionalization of golf balls, in order to produce a golf ball that can be satisfied by advanced players, it is a precondition that it should be at least a three-piece composed of a core, an intermediate layer, and a cover It is becoming. In a multi-piece solid golf ball of three or more pieces, the feeling given by the golf ball varies depending on the thickness and color of each layer. In addition to the ball performance, from the psychological point of golf play, the use of a favorite color ball has a positive impact on the psychological aspect, and the color golf ball for advanced users considering the aspect that performance increases, In particular, color golf balls having a cover layer made of a polyurethane-based material as the outermost layer have not been available on the market.
Conventionally proposed color golf balls include the following prior arts.

  Japanese Patent Application Laid-Open No. 10-155937 (Patent Document 1) discloses a golf ball colored in a color other than white, and when the color tone of the golf ball is displayed in the Lab system, the L value is 80 or more and the a value is The cover in which −30 to +30 and the b value are within the range of −30 to +30 are colored blue, green, pink, yellow, and orange. However, this golf ball was a golf ball with improved fashionability compared to the conventional color ball, but within the color range, it was a pale color and lacked luxury and vividness. There was room for improvement to improve fashionability.

  In JP 2000-024139 A (Patent Document 2), 3.0 to 7.0 parts by mass of one or more kinds of fluorescent pigments and 0.05 to 0.5 parts by mass of titanium oxide with respect to 100 parts by mass of the cover resin. A golf ball has been proposed in which a part is blended and one or more clear paint layers are provided on a cover. However, since the blending amount of the fluorescent pigment is slightly larger, and by further combining with 0.05 to 0.5 parts by mass of titanium oxide, the color tone tends to be tight, and the glitter is somewhat lacking, Although it was excellent in visibility, it was slightly inferior in luxury.

  JP 2000-254250 A (Patent Document 3) discloses a golf ball having at least one colored layer, and the colored layer includes a white organic pigment and / or a white inorganic pigment, a fluorescent pigment, an inorganic pigment, and A golf ball containing an organic pigment and having vividness and visibility has been proposed. However, this golf ball has a light color tone and lacks luxury and vividness.

  Japanese Patent Application Laid-Open No. 2003-126299 (Patent Document 4) discloses a golf ball that exhibits a bright yellow color and is excellent in weather resistance that does not easily cause discoloration or discoloration even under severe use environments. Has been proposed. This golf ball was bright and excellent in weather resistance, and exhibited a deep yellow color, but had a color lacking in a high-class feeling.

  Japanese Patent Application Laid-Open No. 2004-081350 (Patent Document 5) discloses a golf ball in which a paint is coated on the surface of a golf ball body, and the paint contains a polarizing material. In addition, the paint contains a colorant other than white, the surface of the golf ball body is colored in a color other than white, and the lightness L * value based on the L * a * b * color system is 50 or less. Is described. However, this golf ball has disadvantages that the brightness is not sufficient and the fashionability and visibility are somewhat inferior.

  Japanese Patent Application Laid-Open No. 2004-033594 (Patent Document 6) discloses a golf ball that is colored in any one of blue, pink, and yellow and has excellent visibility with almost no visual discomfort. It is described that the a value and the b value satisfy a predetermined relational expression. This golf ball is excellent in visibility without causing visual discomfort, but there is room for improvement in terms of glitter and luxury.

  Japanese Patent Application Laid-Open No. 2007-144097 (Patent Document 7) describes a golf ball which is formed from a cover raw material in which a fluorescent dye is added to a transparent cover resin composition and has improved visibility. This golf ball can exhibit a relatively clear color tone, but when a fluorescent dye is used, it tends to cause a color tone change such as fading due to the influence of time and weather, and there is still room for improvement.

Japanese Patent Laid-Open No. 10-155937 JP 2000-024139 A JP 2000-254250 A JP 2003-126299 A Japanese Patent Laid-Open No. 2004-081350 JP 2004-033594 A JP 2007-144097 A

  The present invention has been made in view of the above circumstances, and provides a color golf ball that has excellent spin performance and durability, has an appearance that is excellent in visibility, fashionability, and luxury, and also has excellent weather resistance. Is.

  As a result of intensive studies to achieve the above object, the present inventors have applied the surface of the core, one or more layers covering the core, and preferably the outermost layer cover formed of polyurethane. The outermost layer cover and / or the paint layer is colored with a fluorescent dye and titanium oxide, and the color tone of the golf ball itself at a measurement hole diameter of 5 mm in the method for measuring a reflecting object according to JIS Z 8722 However, it has been found that a color golf ball satisfying a predetermined range in the Lab color system is excellent in spin performance, durability, and weather resistance, and is excellent in visibility, fashionability, and luxury, and to complete the present invention. It has come.

Accordingly, the present invention provides the following color golf balls.
[1] In a golf ball having a core, one or more covers covering the core, and a paint layer applied to the surface of the outermost layer of the cover, the outermost layer cover and / or the paint layer is fluorescent. It is colored with a dye and titanium oxide, and the color tone of the golf ball itself at a measurement hole diameter of 5 mm in the method for measuring a reflecting object in accordance with JIS Z 8722 is 35 ≦ L, −40 ≦ a ≦ 70 A color golf ball, wherein −60 ≦ b ≦ 60.
[2] The fluorescent dye blended in the outermost layer cover and / or the paint layer is a perinone fluorescent dye, and the color tone of the golf ball itself is a Lab color system, 50 ≦ L, −10 The color golf ball according to [1], wherein ≦ a ≦ 30 and 10 ≦ b ≦ 50.
[3] The fluorescent dye blended in the outermost layer cover and / or the paint layer is an anthraquinone fluorescent dye, and the color tone of the golf ball itself is 40 ≦ L, 30 The color golf ball according to [1], wherein ≦ a ≦ 70 and −20 ≦ b ≦ 20.
[4] The fluorescent dye blended in the outermost layer cover and / or the paint layer is a fluorescent dye selected from the group of perylene, monoazo and quinoline, and the color tone of the golf ball itself is Lab. The color golf ball according to [1], wherein the color system is 60 ≦ L, −40 ≦ a ≦ 0, and 20 ≦ b ≦ 60.
[5] The fluorescent dye blended in the outermost layer cover and / or the paint layer is an anthraquinone fluorescent dye, and the color tone of the golf ball itself is Lab color system, 35 ≦ L, − The color golf ball according to [1], wherein 30 ≦ a ≦ 10 and −60 ≦ b ≦ −20.
[6] The color golf ball according to any one of [1] to [5], wherein the outermost layer cover is selected from thermosetting polyurethane, thermoplastic polyurethane, and reaction injection molded polyurethane.
[7] The color golf ball according to any one of [1] to [6], wherein the outermost layer cover is a thermoplastic polyurethane.
[8] The color golf ball according to [7], wherein the thermoplastic polyurethane constituting the outermost layer cover contains an aromatic or alicyclic polyisocyanate as a component.
[9] The color golf ball according to [8], wherein the thermoplastic polyurethane constituting the outermost layer cover includes an aromatic polyisocyanate as a component.
[10] The outermost layer cover is colored with a fluorescent dye and titanium oxide, and 0.01 to 0.10 parts by mass of one or more fluorescent dyes with respect to 100 parts by mass of the base resin of the outermost layer cover, The color golf ball according to any one of [1] to [9], wherein 0.1 to 0.5 parts by mass of titanium oxide is blended.
[11] The core or intermediate sphere coated with one or more layers on the core is colored white, or the core or intermediate sphere colored white is 0.5 to 2.5 mm thick. A transparent resin layer is coated, and the color tone of the core or intermediate sphere in the measurement hole diameter φ5 mm is 40 ≦ L, −5 ≦ a ≦ 5, −5 ≦ b ≦ 5 in the Lab color system, Further, any one of [1] to [10], wherein the outermost layer cover having a thickness of 0.3 to 2.0 mm is coated on the white colored core or intermediate sphere, or a sphere coated with a transparent resin layer. 2. A color golf ball according to item 1.
[12] The core or intermediate sphere with one or more layers covered on the core is colored in the same color as the outermost layer cover and / or paint layer (fluorescent dye coloring layer) colored with fluorescent dye and titanium oxide Or a core or intermediate sphere colored in the same color as the fluorescent dye-colored layer, and a transparent resin layer having a thickness of 0.5 to 2.5 mm is coated on the core or intermediate sphere. The core or intermediate sphere having a color tone difference ΔE between the color tone at a measurement hole diameter of 5 mm and the color tone of the fluorescent dye colored layer is less than 15 in the Lab color system, and is colored in the same color as the fluorescent dye colored layer Alternatively, the color golf ball according to any one of [1] to [10], wherein the outermost layer cover having a thickness of 0.3 to 2.0 mm is coated on a sphere coated with a transparent resin layer.
[13] The color golf according to any one of [1] to [12], wherein a color difference ΔE between the color tone of the golf ball itself at the measurement hole diameter φ5 mm and the color tone of the golf ball itself at the measurement hole diameter φ15 mm is greater than 5. ball.
[14] The color golf ball according to any one of [1] to [13], wherein a color tone change ΔE after irradiation for 24 hours with a mercury lamp is 8 or less.
[15] Any one of [1] to [14], wherein the paint layer applied on the outermost layer cover contains 0.1 to 10 parts by weight of a polarizing pigment with respect to 100 parts by weight of the base resin composition. The color golf ball described in 1.
[16] Any one of [1] to [15], wherein the paint layer applied on the outermost layer cover contains 0.2 to 8 parts by mass of a polarizing pigment with respect to 100 parts by mass of the base resin composition. The color golf ball described in 1.

  The color golf ball of the present invention is excellent in spin performance and durability, has an appearance that is excellent in visibility, fashionability, and luxury, and has excellent weather resistance. In particular, polyurethane-based material is applied to the outermost layer cover, which has excellent spin performance and durability required by advanced users, and has an appearance that is superior in fashion and luxury, unlike the usual white appearance. It has excellent visibility and can be sufficiently differentiated from other golf players.

1 is a schematic cross-sectional view of a golf ball showing an embodiment of the present invention.

  Hereinafter, the present invention will be described in more detail.

  The ball structure of the present invention has a core, one or more covers that cover the core, and a paint layer that is applied to the surface of the outermost layer of the cover. A large number of dimples are formed. For example, the ball sectional view of FIG. 1 shows a three-piece golf ball G in which the core 1 is covered with a cover, and the cover is formed of two layers, an intermediate layer 2 and an outermost layer 3. A large number of dimples D are formed on the surface of the outermost layer 3. It should be noted that a multi-piece solid golf ball having four or more pieces can be obtained by using three or more covers. The core 1 may be a single layer or two or more layers. A paint layer 4 is formed on the surface of the outermost layer 3 of the cover.

  The core used in the present invention is based on a known rubber material such as 1,4-cis polybutadiene, and includes a co-crosslinking agent such as unsaturated carboxylic acid and its metal salt, zinc oxide, barium sulfate, etc. It can be obtained by vulcanizing a rubber composition blended with an organic filler such as dicumyl peroxide and 1,1-bis (t-butylperoxy) cyclohexane. In the present invention, the core diameter is not particularly limited. Moreover, there is no restriction | limiting in particular about the color tone of a core.

  Next, as a material for the cover used in the present invention, various thermoplastic resins such as ionomer resin and polyurethane, or a resin material of thermoplastic elastomer can be formed as a main material.

As described above, the cover can be formed in one layer or two or more layers, and the thickness of each layer of the cover is not particularly limited, but is preferably 0.3 mm or more, more preferably 0.4 mm or more, Preferably it is 0.5 mm or more, and as an upper limit, Preferably it is 2.5 mm or less, More preferably, it is 2.0 mm or less, More preferably, it is 1.5 mm or less. Moreover, when a cover is two layers, ie, when an outermost layer and an intermediate | middle layer are included, it is preferable that those total thickness is 0.8-3.0 mm.
When the cover has two layers, various adhesives (primers) can be applied between the intermediate layer and the outermost layer as necessary in order to improve adhesion.

  The outermost layer of the cover is preferably formed from a polyurethane material as a main material. Specifically, various urethane resins such as thermosetting polyurethane, thermoplastic polyurethane and reaction injection molded polyurethane can be used. In particular, high productivity and high degree of freedom in coloring, various inorganic / organic fillers. It is preferable to use thermoplastic polyurethane from the viewpoint of a high degree of freedom in blending / alloying a blend / alloy material with a polymer material other than urethane and urethane materials. In this case, as a constituent component of the thermoplastic polyurethane, including an aromatic or alicyclic polyisocyanate component, more preferably including an aromatic polyisocyanate component, exhibits stability during production. It is suitable from the point of balance with physical properties. Thus, by using a polyurethane-based material for the outermost layer, it is possible to provide a golf ball that is excellent in fashionability and luxury while realizing the spin performance and durability performance required by advanced players.

  The outermost base resin itself is preferably transparent or semi-transparent for the purpose of improving fashionability. In the present invention, a fluorescent dye and titanium oxide can be further mixed with the base resin. Although there is no restriction | limiting in particular about the compounding quantity of fluorescent dye, It is preferable to set it as 0.01-0.1 mass part with respect to 100 mass parts of base resin, More preferably, 0.015-0.08 mass part More preferably, it is 0.02 to 0.06 parts by mass. If the blending amount of the fluorescent dye is too small, there is a possibility that a fluorescent color tone cannot be expressed. On the other hand, if the amount is too large, the fluorescence is increased and the visibility is excellent, but the color tone is too clear and lacks a high-class feeling, which may result in a color tone that is unacceptable to the player.

  Here, the type of fluorescent dye blended in the cover is not particularly limited, but perinone fluorescent dye (orange), anthraquinone fluorescent dye (pink or blue), perylene fluorescent dye, monoazo Fluorescent dyes selected from the group of fluorescent dyes and quinoline fluorescent dyes (yellow) can be suitably used because they are excellent in color developability and discoloration resistance (weather resistance).

  Since the fluorescent dye is excellent in colorability and color developability, the target color tone can be expressed by addition of a trace amount. In addition, as a means for expressing the target color tone, in order to improve the visibility by scattering and diffusing light, or to intentionally increase the hiding power, it is not limited to these, but aluminum hydroxide Inorganic fillers such as calcium carbonate and titanium oxide may be blended. In the present invention, titanium oxide can be particularly preferably used.

  As a method of coloring the cover (outermost layer) with a fluorescent dye, a method of blending a fluorescent dye in a fine powder state into a resin material forming the cover and finishing it into a colored resin can be employed. In addition, in order to improve the dispersibility and workability of the fluorescent dye, a powdered fluorescent dye and a resin (preferably the same material as the cover material) are pre-mastered, and the fluorescent dye is mixed with water or non-aqueous. You may mix | blend an appropriate amount what was dissolved in the solvent.

  Next, the blending amount of titanium oxide is not particularly limited, but the blending amount is preferably 0.1 to 0.5 parts by weight, more preferably 0, with respect to 100 parts by weight of the base resin. .15 to 0.45 parts by mass, more preferably 0.2 to 0.4 parts by mass. If the blending amount of titanium oxide is too small, an interaction such as light scattering / diffusion obtained by using a fluorescent dye and titanium oxide in combination cannot be expected. On the other hand, if the amount is too large, the hiding power by titanium oxide is too high, and the color tone is biased to a white system having no transparency, so that the color developability of the fluorescent dye may not be expressed effectively.

  A number of dimples are formed on the surface of the outermost layer cover. Since the dimples may affect the appearance of the ball depending on the diameter, number and depth of the dimples, it is preferable to form the dimples within a range that does not impair the effects of the invention. More specifically, the number of the dimples is not particularly limited, but is preferably 250 or more and 330 or less, and the surface occupation ratio (SR) of the dimples formed on the ball surface is particularly Although there is no limitation, it is preferably 80% or more, more preferably 90% or more, and the upper limit is preferably 98% or less, more preferably 95% or less. For example, if the number of dimples is too large, the effect of visibility of the color ball may be reduced when the ball is exposed to light. In other words, the bottom of the dimple may be shaded depending on the angle at which the ball is viewed, and the ball may appear dark. On the other hand, if the number of dimples is too small, the aerodynamic characteristics cannot be obtained satisfactorily when the ball is hit, and the desired flight distance may not be obtained.

  When producing a sphere having the above cover, a rubber composition mainly composed of polybutadiene or the like is vulcanized under ordinary vulcanization conditions to produce a rubber cross-linked molded article (core), and then a known method such as injection molding. Thus, a cover (intermediate layer / outermost layer) may be sequentially formed around the core. Normally, a large number of dimples are formed on the surface of the outermost layer cover. For the dimples, use is made of an outermost layer cover forming mold in which a large number of convex portions corresponding to the dimples are formed on the inner wall surface of the cavity. Thus, the outermost layer cover is formed at the same time.

  The surface of the outermost layer cover is covered with a paint layer (reference numeral 4) as shown in FIG. The thickness of the paint layer is not particularly limited, but is preferably 5 μm or more, more preferably 10 μm or more, and preferably 20 μm or less, preferably 16 μm or less. If the paint layer is too thin, the durability of the paint may be impaired. On the other hand, if the paint layer is too thick, the influence on the dimple shape becomes large, flight characteristics as designed cannot be obtained, and the flight distance may not be obtained. On the other hand, if the paint layer is too thick, the paint is liable to peel off, and as a result, durability due to repeated impacts may be reduced.

  For the paint layer, it is preferable to use a paint usually used for surface coating of golf balls. Examples thereof include urethane resin paints, acrylic resin paints, polyester resin paints, polyether resin paints, epoxy resin paints, modified products thereof, and mixtures thereof. Among these, a two-component curable urethane resin obtained from a mixture of a polyisocyanate and a functional group capable of reacting with an isocyanate group, particularly a hydroxyl group, in a resin skeleton of a urethane resin, an acrylic resin, or a polyester resin. Paint is preferred. In this case, the polyisocyanate is modified by using one or more of TDI, MDI, HDI, IPDI, NDI, PDI, XDI, and HXDI. Generally, adducts, burettes, and isocyanurates are used. Can take the form of a body.

  When the paint layer is formed by clear coating (coating with a transparent coating), it is preferable to use a two-component curable urethane coating composed of a polyol component having a hydroxyl group and a polyisocyanate component having an isocyanate group.

  As the coating method, a publicly known method can be used. For example, the entire ball can be coated with various paints by spraying with the ball placed on the needle tip of the needle base. Prior to painting, for the purpose of improving the adhesion between the object to be painted and the paint layer, it is not limited to these methods, but surface modification by plasma treatment or corona discharge treatment may be performed, primer etc. May be applied.

  The paint layer in the present invention can contain a fluorescent dye and titanium oxide. When a fluorescent dye and titanium oxide are used for the paint layer, the same fluorescent dye and titanium oxide used for the outermost layer cover described above can be used. When the fluorescent dye is blended in the paint layer, the blending amount is not particularly limited, but is 0.01 to 10 parts by mass, preferably 0.1 to 8 parts by mass with respect to 100 parts by mass of the coating film solid content. It is recommended to use within the range. When the blending amount of the fluorescent dye is small, the coating film hiding power is inferior and the desired color developability cannot be obtained. Moreover, when there are too many compounding quantities, coating-film physical properties, such as durability, are inferior, and it is unpreferable.

  Moreover, there is no restriction | limiting in particular about the compounding quantity of a titanium oxide, However, It is preferable to set it as 0.01-20 mass parts with respect to 100 mass parts of coating-film solid content, More preferably, 0.05-10 mass parts More preferably, it is 0.1 to 5 parts by mass. If the amount of titanium oxide is too small, light scattering / diffusion action due to the combined use with a fluorescent dye cannot be expected. Moreover, when there are too many this compounding quantities, it will become the color tone biased to white type | system | group, and coating-film physical properties, such as durability, are inferior, and is not preferable.

  Moreover, when forming the paint layer colored with said fluorescent dye and titanium oxide, you may perform primer coating and sealer coating before the coating of a colored paint layer as needed.

  Further, as another aspect of the paint layer, although not particularly illustrated, a coloring material containing a fluorescent dye and titanium oxide is coated on the surface of the outermost layer cover having dimples by spraying or the like, and is further usually provided thereon. A colored paint layer can be formed by applying clear coating or the like. In other words, the paint layer can be composed of two layers of a very thin colored layer and a clear coating layer.

  In general, the paint is obtained by appropriately adding various solvents and additives to the above-described resin, and the paint may further contain a polarizing pigment. When a polarizing pigment is used, 0.05 to 0.5 parts by weight of the fluorescent brightening agent and 0.1 to 10 parts by weight of the polarizing pigment, preferably 0.2 to 100 parts by weight with respect to 100 parts by weight of the base resin. It is desirable to use in the range of 8 parts by mass. When the blending amount of the polarizing pigment is too small, the glittering property cannot be expressed on the ball surface. On the other hand, if the amount is too large, the light may interfere with each other and the brightness may be impaired, and the spin performance as a ball may change or the paint may peel off. In addition, since polarizing pigments are generally expensive, adding more than the appropriate amount causes unnecessary cost increase, and polarizing pigments are likely to precipitate in the paint material before solidification, causing deterioration in productivity in the paint coating process. It is easy to become. It is preferable to use the fluorescent whitening agent / polarizing pigment in a mass ratio of 0.08 to 0.5. In order to bring out the brightness and brightness of the ball, it is important to adjust the ratio between the fluorescent brightener and the polarizing pigment. When the addition amount of the fluorescent brightener and the polarizing pigment is not appropriate, there is a possibility that the appropriate brightness of the ball is lost, and as a result, the effect of the present invention may not be obtained.

  Moreover, a pearl pigment can be used suitably as a polarizing pigment. Pearl pigments can be broadly classified into metal oxide-coated mica, basic lead carbonate, bismuth oxychloride, and natural fish phosphorus foil, but they are non-toxic and have the highest chemical stability. It is preferred to select a coated mica. In general, titanium dioxide and iron oxide are often used as the metal oxides for coating the mica, and various colors and interference effects can be obtained by changing the coverage (thickness of the coating layer). Can do. The greater the particle size of these pigments, the better the glitter. However, since the larger the particle size of the pigment, the easier it is to settle, it is desired to select a pigment having an appropriate particle size.

  In a golf ball having a paint layer formed of a paint containing a pearl pigment as described above, light can be reflected at various angles. Further, since the sunlight is sufficiently reflected, the golf ball can be found more easily.

  In the present invention, as for the color tone of the ball, the color tone of the golf ball itself at a measurement hole diameter of 5 mm in the method of measuring a reflecting object according to JIS Z 8722 (2000) is 35 ≦ L, −40 ≦ It is characterized by a ≦ 70 and −60 ≦ b ≦ 60. The evaluation of this color tone test can be carried out using a measurement hole diameter of 15 mm for the purpose of collecting data over a wider area. As for the difference between the measurement hole diameter φ5 mm and φ15 mm, the more the color tone difference between φ5 mm and φ15 mm, the more excellent the glitter and the easier to see the golf ball. In particular, the object of the present invention is a golf ball having a small diameter, and in order to give an unprecedented high-class feeling and visibility that can be expressed from the color tone of the small ball, not only the measurement hole diameter φ15 mm but also a small hole diameter of φ5 mm Therefore, it is necessary to measure the color tone and to evaluate the ball color tone comprehensively. Specifically, the color tone difference ΔE between the color tone of the golf ball itself at the measurement hole diameter φ5 mm and the color tone of the golf ball itself at the measurement hole diameter φ15 mm is preferably larger than 5.

  When the fluorescent dye blended in the outermost layer cover and / or the paint layer is an orange fluorescent dye, the color tone of the golf ball is the Lab color system, 50 ≦ L, −10 ≦ a ≦ 30, 10 ≦ b It is preferable that ≦ 50. When a pink fluorescent dye is blended as the fluorescent dye, the color tone of the golf ball is preferably 40 ≦ L, 30 ≦ a ≦ 70, −20 ≦ b ≦ 20. Further, when a yellow fluorescent dye is used as the fluorescent dye, the color tone of the golf ball is preferably the Lab color system and 60 ≦ L, −40 ≦ a ≦ 0, and 20 ≦ b ≦ 60. When a blue fluorescent dye is used as the fluorescent dye, the color tone of the golf ball is preferably 35 ≦ L, −30 ≦ a ≦ 10, and −60 ≦ b ≦ −20 in the Lab color system. is there.

  In the present invention, as one of the specific modes for effectively exhibiting the predetermined effect of the present invention, a core or an intermediate sphere having a core covered with one or more covers is colored white, or white A core or intermediate sphere colored with a transparent resin layer having a thickness of 0.5 to 2.5 mm is coated, and the color tone of the core or intermediate sphere at a measurement hole diameter of 5 mm is 40 mm in the Lab color system. ≦ L, −5 ≦ a ≦ 5, −5 ≦ b ≦ 5, and further, the above-described white colored core or intermediate sphere or a sphere coated with a transparent resin layer has a thickness of 0.3 to 2 A ball structure covering the outermost layer cover of 0.0 mm can be exemplified. In addition, the core or an intermediate sphere having a core covered with one or more covers is colored in the same color as the outermost cover and / or paint layer (fluorescent dye coloring layer) colored with a fluorescent dye and titanium oxide. Or a core or intermediate sphere colored in the same color as the fluorescent dye-colored layer is coated with a transparent resin layer having a thickness of 0.5 to 2.5 mm. A core or intermediate sphere having a color tone difference ΔE between a color tone at a measurement hole diameter of φ5 mm and a color tone of the fluorescent dye colored layer is less than 15 in the Lab color system, and is colored in the same color as the fluorescent dye colored layer, Alternatively, an outermost layer cover having a thickness of 0.3 to 2.0 mm can be coated on a sphere that is coated with a transparent resin layer.

  In the present invention, it is preferable that the color difference ΔE of the ball when irradiated with a mercury lamp for 24 hours is 8 or less. This color difference ΔE is the color difference before irradiation to the ball and after irradiation for 24 hours, and the smaller the value, the less the color change. The measurement of the color difference ΔE of the ball can be performed using a known color difference meter based on the standard of JIS Z 8701 (1999).

  In addition, since easy discoloration by ultraviolet rays is not preferable for the golf ball surface, as a measure of yellowing resistance, when the golf ball surface is irradiated with a mercury lamp for 24 hours, the golf ball surface after irradiation and golf before irradiation with the mercury lamp are used. It is recommended that the color change difference (ΔYI) based on the JIS-K7103 reflection method with the ball surface is −10 or more and 10 or less.

With regard to the color of the ball, it is possible to distinguish between a distance type and a spin type for men and women, or in terms of ball performance, depending on the color preference and image of the consumer. In general, it is an effective means to provide a colored golf ball in terms of easiness of selecting a product for a user among a group of golf balls having many whites.
The golf ball of the present invention can be in compliance with golf regulations for competition purposes, and can be formed with a diameter of 42.67 mm or more and a weight of 45.93 g or less.

  EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated concretely, this invention is not restrict | limited to the following Example.

[Examples 1 to 13, Comparative Examples 1 to 4]
For each of the examples and comparative examples, rubber compositions shown in Table 1 below were prepared, kneaded with a kneader or roll, and then a core was produced under vulcanization conditions at 155 ° C. for 20 minutes. Next, the resin mixed material shown in Table 2 is injected around the core using an injection mold to produce a sphere in which the core is covered with an intermediate layer, and this is set in another mold. An outermost cover material containing a predetermined amount of the fluorescent dye and titanium oxide shown was injection molded. After the plasma treatment is applied to the cover surface, a non-yellowing urethane / acrylic resin-based paint is applied by a spray coating method and dried to cover a clear paint layer having a thickness of about 15 μm, or a non-yellowing urethane / A mixture of an acrylic resin paint resin and a predetermined amount of pearl pigment was applied by the same method as described above, and a pearl paint layer having the same thickness was coated.

The materials used for the core formulation are as follows.
Polybutadiene ... Product name "BR730" JSR cis 1,4-polybutadiene zinc acrylate ... Nippon Shokubai's zinc acrylate and zinc stearate mixture Zinc oxide ... Sakai Chemical Industry's three types of zinc oxide barium sulfate ... Sakai Chemical Precipitated barium sulfate # 100 "
Anti-aging agent: Ouchi Shinsei Chemical Co., Ltd. product name “NOCRACK NS-6”
Zinc stearate ... made by NOF Corporation "Zinc stearate G"
Pentachlorothiophenol zinc salt: ZHEJIANG CHO & FU CHEMICAL CO. , LTD. (China)
Peroxide: NOF Corporation peroxide trade name "Perhexa C-40"
Coloring material (1) ... RESINO RED K-50% LB made by Resino Color Industry
Coloring material (2) ... RESINO GREEN GBA-50% LB made by Resino Color Industry

The materials used for the intermediate layer formulation are as follows.
Product name "Himiran 1605" ... Mitsui-DuPont Polychemical Co., Ltd. Sodium neutralized ethylene-methacrylic acid-acrylic acid ester copolymer Product name "HiMilan 1706" ... Mitsui DuPont Polychemical Co., Ltd. Zinc Neutralized-ethylene-methacrylic Acid-acrylic acid ester copolymer trade name "Himiran 1557" ... Mitsui-DuPont Polychemical Co., Ltd. zinc neutralization-ethylene-methacrylic acid-acrylic acid ester copolymer trade name "Surlin 6320" ... DuPont magnesium neutralization -Ethylene-methacrylic acid-acrylic acid ester copolymer trade name "Nucleel 035C" ... Mitsui-DuPont Polychemical Co., Ltd. Ethylene-methacrylic acid-acrylic acid ester copolymer titanium oxide ... Ishihara Sangyo Co., Ltd. trade name "Taipeke R550"
Red pigment ... Quinacridone red magnesium stearate ... NOF Corporation trade name "Magnesium stearate G"
Magnesium oxide ... Magnesium oxide manufactured by Kyowa Chemical Industry Co., Ltd.

The materials used for the outermost layer formulation are as follows.
Product name “Pandex T8290”… MDI-PTMG type thermoplastic polyurethane material, resin hardness Shore A “93”, 52% rebound resilience
Product name "Pandex T8283" ... DCI Bayer Polymer Co., Ltd. MDI-PTMG type thermoplastic polyurethane material, resin hardness Shore A "83", rebound resilience 55%
Polyisocyanate compound ... 4,4'-diphenylmethane diisocyanate thermoplastic elastomer ... Polyester thermoplastic elastomer manufactured by Toray DuPont Co., Ltd., trade name "Hytrel 4001"
Product name "Himiran 1557" ... Zinc neutralized ethylene-methacrylic acid copolymer made by Mitsui DuPont Polychemical Co., Ltd. Product name "Himiran 1855" made by Mitsui DuPont Polychemical Co., Ltd. Zinc neutralized ethylene-methacrylic acid-acrylic acid Ester copolymer polyethylene wax ... Sanyo Chemical Industries, Ltd. Trade name "Sun Wax 161P"
Titanium oxide ... Ishihara Sangyo Co., Ltd. Trade name "Taipeke R550"
Magnesium stearate ... NOF Corporation trade name "Magnesium stearate G"
Magnesium oxide: Magnesium oxide perylene-based fluorescent dye manufactured by Kyowa Chemical Industry Co., Ltd. Solvent Green 5, manufactured by Sumika Chemtex Co., Ltd. Trade name “Sumiplast Yellow FL7G”
Monoazo fluorescent dye ... Solvent Yellow 157, manufactured by Sumika Chemtex Co., Ltd. Trade name "Sumiplast Yellow HGN"
Quinoline fluorescent dye ... Disperse Yellow 54, manufactured by Sumika Chemtex Co., Ltd. Trade name "Sumiplast Yellow HLR"
Perinone-based fluorescent dye ... Solvent Orange 60, manufactured by Sumika Chemtex Co., Ltd. Product name "Sumiplast Orange HRP"
Anthraquinone fluorescent dye (1) ... Solvent Red 149, manufactured by Sumika Chemtex Co., Ltd., trade name “Sumiplast Red HFG”
Anthraquinone fluorescent dye (2) ... Solvent Red 150, manufactured by Sumika Chemtex Co., Ltd. Trade name "Sumiplast Red HF4G"
Anthraquinone fluorescent dye (3) ... Disperse Blue 60, manufactured by Sumika Chemtex Co., Ltd. Trade name “Sumiplast Turq. Blue G”
Heterocyclic fluorescent dye ... Solvent Yellow 98

  The physical properties, initial speed, approach spin performance, scuff resistance, visibility, luxury and glitter of the golf balls produced above were evaluated according to the following criteria.

Deflection amount of ball The amount of deformation (mm) from when the initial load of 98 N (10 kgf) was applied to when the final load of 1275 N (130 kgf) was applied to the ball was measured.

Initial speed initial speed was measured using an initial speed measuring device of the same type as the USGA drum rotation type initial speed meter approved by R & A. The balls were conditioned at a temperature of 23 ± 1 ° C. for more than 3 hours and tested in a room at room temperature 23 ± 2 ° C. The ball was hit at a hitting speed of 143.8 ft / s (43.83 m / s) using a 250 pound (113.4 kg) head (striking mass). One dozen balls were hit four times, and the time required to pass between 6.28 ft (1.91 m) was measured, and the initial speed was calculated. This cycle was performed in about 15 minutes.

The amount of spin when hitting at a head speed (HS) of 20 m / s by setting a “sand stage X-Wedge” (Loft angle 58 °) sand wedge (SW) club made by Bridgestone Sports to the approach spin golf striking robot. (Rpm) was measured.

Scratch resistance of the balls The balls were kept at 23 ° C., 13 ° C., and 0 ° C., and a swing robot machine was used. The club used a pitching wedge to hit each ball at a head speed of 33 m / s. Was visually evaluated according to the following criteria.
5 points: There are no scratches or scars are hardly noticeable.
4 points: Slightly scratched but hardly noticeable.
3 points: The surface is slightly fuzzy.
2 points: The surface is fuzzy or dimples are missing.
1 point: The dimple has been completely scraped off

Ball color tone The color tone of the ball conforms to JIS Z 8722 reflective object measurement method (diffuse light illumination, 8-degree light receiving optical system: condition c) using a color difference meter (model SC-P, manufactured by Suga Test Instruments Co., Ltd.) And measured by d / 8 (measured without including the specular reflection component of the sample: with optical trap). The measurement hole diameter used was φ15 mm and φ5 mm.

Ball Discoloration Test Using a mercury lamp “H400-F” for color fading test manufactured by Toshiba Corporation, the test was performed under the conditions of a distance between the light source and the ball of 30 cm and a drum rotation speed of 1 rpm. The ball surface was irradiated with a mercury lamp for 24 hours. The change in the color of the ball surface before and after irradiation was measured using a color difference meter (model SC-P) manufactured by Suga Test Instruments Co., Ltd. Based on the Lab color specification of JIS Z 8701, The color difference ΔE was determined. Note that the smaller the color difference ΔE, the less the color change.

Sensory evaluation was performed according to the following criteria by 10 high visibility golf players.
◎: Eight or more out of 10 felt that it was easy to see on the grass
○: 5 to 7 out of 10 felt easy to see on the grass
Δ: 3 to 4 out of 10 felt easy to see on the grass
X: 2 out of 10 people felt that it was easy to see on the grass

Sensory evaluation was conducted according to the following criteria by 10 high- class golf players.
◎: Eight or more out of 10 felt “luxurious”
○: 5 to 7 out of 10 felt “classy”
△: 3 to 4 out of 10 felt “luxurious”
×: 2 or less of 10 people felt that “there was luxury”

Sensory evaluation was carried out according to the following criteria by 10 glittering advanced golf players.
◎: Eight or more out of 10 felt “brilliant colors”
○: 5 to 7 out of 10 felt “brilliant colors”
Δ: 3 to 4 out of 10 felt “bright color”
×: 2 or less of 10 people felt “brilliant colors”

The golf ball of Comparative Example 1 has a gray-colored core coated with a transparent intermediate layer and a colored outer layer on the core, so that the gray-colored hue of the base is visible, high-quality, As a result, the brightness was impaired.
Since the golf ball of Comparative Example 2 uses a heterocyclic fluorescent dye as a colorant for the outer layer (cover), the result is poor discoloration resistance (weather resistance). Further, in addition to poor discoloration resistance, the outermost paint layer is a clear coating, so it is somewhat lacking in luxury.
In the golf ball of Comparative Example 3, since the outermost layer is a concealed white coloration with titanium oxide, there is no difference in color at the measurement hole diameter φ5 mm and φ15 mm in the measurement method according to JIS Z 8722. Because the paint layer is a clear paint, there is no glitter and luxury, and visibility is inferior.
In the golf ball of Comparative Example 4, since the outermost layer cover is an ionomer material, it is inferior in approach spin amount and inferior in scratch resistance as compared with the urethane material described in this example, so that the advanced player is satisfied. The golf ball physical properties are not satisfied. Furthermore, since the outermost paint layer is a clear coating, it lacks a sense of quality.

Claims (16)

  A golf ball having a core, one or more covers covering the core, and a paint layer applied to a surface of the outermost layer of the cover, wherein the outermost layer cover and / or the paint layer is a fluorescent dye and an oxidation The color tone of the golf ball itself, which is colored with titanium and has a measurement hole diameter of 5 mm in the measurement method of a reflective object in accordance with JIS Z 8722, is a Lab color system, 35 ≦ L, −40 ≦ a ≦ 70, −60 ≦ A color golf ball, wherein b ≦ 60.   The fluorescent dye blended in the outermost layer cover and / or the paint layer is a perinone fluorescent dye, and the color tone of the golf ball itself is Lab color system, 50 ≦ L, −10 ≦ a ≦ The color golf ball according to claim 1, wherein 30 and 10 ≦ b ≦ 50.   The fluorescent dye blended in the outermost layer cover and / or the paint layer is an anthraquinone fluorescent dye, and the color tone of the golf ball itself is Lab color system, 40 ≦ L, 30 ≦ a ≦ The color golf ball according to claim 1, wherein 70 and −20 ≦ b ≦ 20.   The fluorescent dye blended in the outermost layer cover and / or the paint layer is a fluorescent dye selected from the group of perylene, monoazo and quinoline, and the color tone of the golf ball itself is Lab color system The color golf ball according to claim 1, wherein 60 ≦ L, −40 ≦ a ≦ 0, and 20 ≦ b ≦ 60.   The fluorescent dye blended in the outermost layer cover and / or the paint layer is an anthraquinone fluorescent dye, and the color tone of the golf ball itself is Lab color system, 35 ≦ L, −30 ≦ a The color golf ball according to claim 1, wherein ≦ 10 and −60 ≦ b ≦ −20.   The color golf ball according to any one of claims 1 to 5, wherein the outermost layer cover is selected from thermosetting polyurethane, thermoplastic polyurethane, and reaction injection molded polyurethane.   The color golf ball according to claim 1, wherein the outermost layer cover is a thermoplastic polyurethane.   The color golf ball according to claim 7, wherein the thermoplastic polyurethane constituting the outermost layer cover contains an aromatic or alicyclic polyisocyanate as a component.   The color golf ball according to claim 8, wherein the thermoplastic polyurethane constituting the outermost layer cover contains an aromatic polyisocyanate as a component.   The outermost layer cover is colored with a fluorescent dye and titanium oxide, and 0.01 to 0.10 parts by mass of one or more types of fluorescent dyes and titanium oxide with respect to 100 parts by mass of the base resin of the outermost layer cover. The color golf ball according to claim 1, wherein 0.1 to 0.5 part by mass is blended.   A transparent resin layer having a thickness of 0.5 to 2.5 mm in which the core or intermediate sphere coated with one or more covers on the core is colored white, or the core or intermediate sphere colored in white The color tone at the measurement hole diameter φ5 mm of the core or intermediate sphere is Lab color system, 40 ≦ L, −5 ≦ a ≦ 5, −5 ≦ b ≦ 5, and 11. The outermost layer cover having a thickness of 0.3 to 2.0 mm is coated on a white-colored core or intermediate sphere, or a sphere coated with a transparent resin layer on the core or the intermediate sphere. Color golf ball.   A core or an intermediate sphere coated with one or more layers on the core is colored in the same color as the outermost layer cover and / or paint layer (fluorescent dye coloring layer) colored with a fluorescent dye and titanium oxide. Or a core or intermediate sphere colored in the same color as the fluorescent dye-colored layer and a transparent resin layer having a thickness of 0.5 to 2.5 mm, and the measured pore size of the core or intermediate sphere Color difference ΔE between the color tone at φ5 mm and the color tone of the fluorescent dye-colored layer is less than 15 in the Lab color system, and the core or intermediate spheres colored in the same color as the fluorescent dye-colored layer, or these The color golf ball according to any one of claims 1 to 10, wherein an outermost layer cover having a thickness of 0.3 to 2.0 mm is coated on a sphere coated with a transparent resin layer.   13. The color golf ball according to claim 1, wherein a color difference ΔE between the color tone of the golf ball itself at the measurement hole diameter of φ5 mm and the color tone of the golf ball itself at the measurement hole diameter of φ15 mm is greater than 5. 13.   The color golf ball according to claim 1, wherein a color tone change ΔE after irradiation for 24 hours with a mercury lamp is 8 or less.   The color golf according to any one of claims 1 to 14, wherein the paint layer applied on the outermost layer cover contains 0.1 to 10 parts by mass of a polarizing pigment with respect to 100 parts by mass of the base resin composition. ball.   The color golf according to any one of claims 1 to 15, wherein the paint layer applied on the outermost layer cover contains 0.2 to 8 parts by mass of a polarizing pigment with respect to 100 parts by mass of the base resin composition. ball.

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