JP2007144097A - Golf ball - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a golf ball capable of raising visual recognition property. <P>SOLUTION: The solid core 12 of the golf ball 10 is coated with a cover 14. The cover 14 is formed with, e.g., a cover raw material which is obtained by adding fluorescent dye to a transparent resin composition for the cover. When expressed by CIE/L*a*b* color system, the color tone is set to have brightness L* being ≥50, a chromaticity a* being ≤-20 or ≥+20, and the chromaticity b* being ≥+35. The golf ball 10 having the cover 14 is recognized by a player as the ball colored in bright yellow green, yellow, or orange. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a golf ball having a cover colored in a color recognizable as yellowish green, yellow or orange.

  The cover that is the outermost layer of the golf ball is generally white, but golf balls (color balls) in which the cover is colored yellow or orange are also commercially available. This type of color ball is particularly effective when played in winter, for example. That is, in the winter season, the lawn on the field withers and white, but the color ball has better visibility on the white lawn in this way than the white ball.

  In addition, there is an advantage that it is very easy to distinguish from the player's ball by using a color ball of a different color from other players even in the winter season.

  However, the demand for color balls is not very large. In this regard, in Patent Document 1, since a general white ball is colored in a significantly rich color, when a player who is used to a white ball uses a color ball, for example, the player is visually informed at the time of addressing. It is presumed that the reason is that it feels uncomfortable, and it is proposed to reduce the degree of coloring. That is, Patent Document 1 discloses a light-colored ball.

Japanese Patent Laid-Open No. 10-155937

  However, the light color ball disclosed in Patent Document 1 has a small degree of coloring as the name suggests, so if the distance from the eye viewpoint to the ball is long, it is not easy to distinguish it from a white ball. In other words, this light color ball is substantially the same as a white ball in terms of visibility from a long distance. For example, it is not easy to recognize a light color ball on a lawn that has withered when playing in winter. There are concerns.

  The present invention has been made to solve the above-described problems, and can be easily viewed from a long distance not only on a dry lawn in winter but also when playing in weather such as fog and rain. An object of the present invention is to provide a golf ball.

In order to achieve the above object, the present invention provides a golf ball having a cover on the outermost surface.
When the color tone of the surface of the cover is expressed in the CIE / L ^* a ^* b ^* color system, the lightness L ^* is 50 or more, the chromaticity a ^* is −20 or less or +20 or more, and the chromaticity b ^* is +35 or more. It is characterized by being.

  A golf ball having a cover whose color tone is set as described above is recognized as a clear yellow-green, yellow or orange color to the player's eyes. Accordingly, it is easy to distinguish from a lawn that has withered and white in winter. Further, even when playing in weather such as fog or rain, the flight direction and the falling point of the ball can be easily visually confirmed from a long distance. That is, a golf ball having excellent visibility can be obtained.

  In order to color the cover as described above, one or more fluorescent dyes may be added to at least one of the transparent thermoplastic resin or the transparent thermoplastic elastomer. Here, “coloring” in the present invention includes a case in which a degree of transparency that can transmit light remains even after coloring.

In this case, it is preferable that the lightness L ^* , the chromaticity a ^*, and the chromaticity b ^* satisfy the following formula (1).

If the left side, that is, the saturation exceeds 1.2 times the lightness L ^* , the coloring becomes excessively clear. For this reason, some players may feel dazzling when hitting.

  Preferable examples of this type of fluorescent dye include one or more selected from the group of naphthalimide fluorescent dyes, thioxanthene fluorescent dyes, perylene fluorescent dyes, and thioindigo fluorescent dyes.

  More specifically, C.I. I. Solvent Yellow 98 or C.I. I. Fluorescent dyes such as Solvent Orange 63 can be mentioned. The cover is C.I. I. When Solvent Yellow 98 is used, it is generally yellow, and depending on the lightness, it is colored yellow-green. I. When Solvent Orange 63 is used, it is colored orange.

  In addition, when at least one of a transparent thermoplastic resin or a transparent thermoplastic elastomer is 100 weight part, the preferable addition ratio of the said fluorescent dye is 0.005-3.0 weight part. In this case, although the cover is colored, it is translucent to the extent that light can be transmitted. In the present invention, as described above, this state is also included in “coloring”.

  Here, it is preferable to add an ultraviolet absorber to the cover. Thereby, the golf ball comes to have excellent weather resistance. That is, even when used for play in an environment exposed to sunlight for a long period of time, the ball is hardly deteriorated.

  Generally, a fluorescent dye absorbs light in a wavelength range of 340 to 400 nm, that is, ultraviolet light and emits fluorescence. Therefore, it is preferable to select an ultraviolet absorber having an absorption peak in the wavelength range of less than 340 nm and no absorption peak in the wavelength range of 340 to 400 nm. If the absorption peak exists in the wavelength range of 340 to 400 nm, the fluorescence is difficult to occur. For this reason, it becomes difficult for the player to recognize the color developed by fluorescence.

  Preferable examples of this type of ultraviolet absorber include oxalic anilide ultraviolet absorbers and malonic ester ultraviolet absorbers.

  And it is preferable that the ratio of an ultraviolet absorber shall be 0.01-3.0 weight part when at least one of the said transparent thermoplastic resin or the said transparent thermoplastic elastomer is 100 weight part.

  Furthermore, as a suitable example of the fluorescent dye having an absorption peak in the wavelength region of 340 to 400 nm, the above-described C.I. I. Solvent Yellow 98 or C.I. I. The solvent orange 63 can be mentioned. In this case, as the ultraviolet absorber, for example, an oxalic acid anilide derivative having an absorption peak at 320 nm that is a wavelength region of less than 340 nm and no absorption peak at a wavelength region of 340 to 400 nm can be selected.

  Alternatively, at least one of titanium dioxide and zinc oxide may be added to the cover. Even in this case, the weather resistance of the golf ball can be improved.

  The average particle diameter of titanium dioxide is preferably 10 nm to 200 nm. If it is less than 10 nm, the effect of improving the weather resistance is poor. If it exceeds 200 nm, the cover becomes whitish. A more preferable average particle diameter is 10 to 100 nm. Even when zinc oxide is used, for the same reason, the average particle diameter is preferably 10 to 200 nm, and more preferably 10 to 100 nm. Here, in the present invention, in the case of dendritic particles, the average minor axis diameter is defined as the average particle diameter.

  When at least one of the transparent thermoplastic resin or the transparent thermoplastic elastomer is 100 parts by weight, a preferable addition ratio of titanium dioxide, zinc oxide, or a mixture thereof is 0.01 to 1.0 part by weight. In this case as well, the cover is translucent and light can be transmitted.

  Furthermore, you may make it improve a weather resistance by adding at least one of a hindered amine light stabilizer or a hindered phenolic antioxidant to a cover. In this case, in order to make the cover translucent enough to transmit light, when at least one of the transparent thermoplastic resin or the transparent thermoplastic elastomer is 100 parts by weight, a hindered amine light stabilizer, a hindered phenol is used. It is preferable to add a system antioxidant or a mixture thereof in a proportion of 0.01 to 2.0 parts by weight.

  In either case, an inner layer colored with a non-fluorescent yellow pigment may be provided inside the cover configured as described above. That is, according to the present invention, not only a so-called two-piece solid golf ball in which a single layer of solid core is covered with a single layer cover, but also, for example, a multi-layer solid core is covered with a two-layer cover of the cover and the inner layer. It is also possible to construct a multi-piece solid golf ball.

  According to the present invention, the brightness of the cover is set to a predetermined value or more, and the chromaticity is set to a predetermined value or less. For this reason, a golf ball having a cover colored in clear yellow-green, yellow or orange is obtained.

  Such a golf ball is excellent in visibility. Therefore, it can be easily distinguished from a lawn that withered in winter and has a white color. Further, even in weather such as fog and rain, the flight direction and the falling point can be easily determined from a long distance visually.

  Hereinafter, preferred embodiments of the golf ball according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic overall cross-sectional view of a golf ball 10 according to the present embodiment. In this case, the golf ball 10 is a so-called two-piece solid golf ball in which a single-layer solid core 12 is covered with a single-layer cover 14.

  As the material of the solid core 12, the same material as the solid core of a conventional two-piece solid golf ball may be selected. Preferable examples thereof include polybutadiene rubber as a base rubber, zinc acrylate which is an α, β-unsaturated carboxylic acid metal salt, dicumyl peroxide which is an organic peroxide, zinc oxide which is a filler, and the like. The compounded rubber composition is mentioned.

  On the other hand, the cover 14 is mainly composed of an ionomer resin, or a cover resin composition containing at least one of a thermoplastic elastomer such as a polyester-based thermoplastic elastomer, a polyamide-based thermoplastic elastomer, and a polyurethane-based thermoplastic elastomer. To do. That is, the cover 14 may contain either an ionomer resin or a thermoplastic elastomer, or may contain a mixture of an ionomer resin and a thermoplastic elastomer.

The color tone of the cover 14 is expressed by the CIE / L ^* a ^* b ^* color system, which is a standard of the International Commission on Illumination (CIE), and the lightness L ^* is 50 or more and the chromaticity a ^* is −20 or less or +20 or more. The chromaticity b ^* is set to +35 or more. When the chromaticity a ^* is −20 or less, the cover 14 is colored yellowish green to yellow, and when it is +20 or more, it is colored orange. Here, the CIE / L ^* a ^* b ^* color system is a color system standardized by the CIE, and is adopted as Z8729 in JIS. Further, in order to grasp the lightness L ^* , chromaticity a ^*, and chromaticity b ^* in the cover 14, for example, the surface color of the ball may be measured using a color difference meter CR-300 manufactured by Konica Minolta.

  By setting the brightness and chromaticity of the cover 14 as described above, the golf ball 10 is recognized as a clear yellow-green, yellow or orange color to the player's eyes. For this reason, since favorable visibility is ensured, even if it uses in winter, for example, it can be easily distinguished from a lawn that has withered white. In addition, when playing under the weather such as fog, rain, etc., it can be easily seen from a long distance.

If the lightness L ^* is less than 50, the color of the cover 14 becomes dark. Further, when the chromaticity a ^* is larger than −20 or smaller than +20, the color in the green direction or the red direction becomes light. Further, when the chromaticity b ^* is smaller than +35, the color in the yellow direction becomes light and the visibility is lowered. More preferable ranges of the lightness L ^* , chromaticity a ^* , and chromaticity b ^* are 60 to 100, −25 to −100 (yellowish green to yellow), +25 to +100 (orange), and +40 to +100, respectively. .

It is particularly preferable that the cover 14 has a color tone that can be recognized as yellow. In that case, the lightness L ^* is 80 to 100, the chromaticity a ^* is −25 to −45, and the chromaticity b ^* is +85 to +100. Is preferred.

Furthermore, it is preferable that L ^* , a ^* , and b ^* have a relationship satisfying the following formula (1).

If the left side in the formula (1), that is, the saturation is larger than 1.2 × L ^* , the cover 14 is excessively vividly colored. For this reason, some players may feel dazzling when hitting.

  In order to set the color tone of the cover 14 as described above, for example, an ionomer resin, a thermoplastic elastomer, or a mixture of both is selected and a fluorescent dye is added.

In this case, as the fluorescent dye, when the color tone of the cover 14 is expressed in the CIE / L ^* a ^* b ^* color system, the lightness L ^* is 50 or more, the chromaticity a ^* is −20 or less, or +20 or more, the chromaticity b Those whose ^* is +35 or more are selected.

  Preferable examples of this type of fluorescent dye include naphthalimide-based fluorescent dyes such as C.I. I. Solvent Yellow 98 is exemplified. More specifically, it is Hostsol Yellow 3G (trade name) manufactured by Clariant. Examples of suitable fluorescent dyes other than naphthalimide are C.I. I. Thioxanthene fluorescent dyes such as Solvent Orange 63, C.I. I. Examples thereof include thioindigo fluorescent dyes such as Vat Red 63. Furthermore, a perylene fluorescent dye may be used. The fluorescent dyes as described above may be used alone or in combination of two or more.

  A suitable addition amount of the fluorescent dye is 0.005 to 3.0 parts by weight with respect to 100 parts by weight of the cover resin composition. If it is less than 0.005 parts by weight, the saturation becomes excessively light. On the other hand, when the amount is more than 3.0 parts by weight, the saturation becomes excessively thick and fading easily occurs. A more preferable addition amount of the fluorescent dye is 0.01 to 2.7 parts by weight, more preferably 0.02 to 2.5 parts by weight with respect to 100 parts by weight of the cover resin composition.

  An ultraviolet absorber may be further added to the cover 14. When the cover 14 contains an ultraviolet absorber, there is an advantage that the weather resistance of the golf ball 10 is improved.

  The fluorescent dye as described above absorbs light in the wavelength range of 340 to 400 nm, that is, ultraviolet light and emits fluorescence. Therefore, when an ultraviolet absorber that absorbs ultraviolet light is added, the fluorescent dye absorbs ultraviolet light. Thus, it becomes difficult to emit fluorescence. Eventually, it becomes difficult for the player to recognize the color developed by the fluorescence.

  Therefore, it is preferable to select an ultraviolet absorber having an absorption peak in the wavelength range of less than 340 nm and no absorption peak in the wavelength range of 340 to 400 nm. Preferred specific examples include malonic acids such as oxalic acid anilide-based UV absorbers such as Sanduvor VSU (trade name) manufactured by Clariant, and Hostavin PR-25 and Hostavin B-CAP (both trade names) manufactured by the same company. An ester ultraviolet absorber can be mentioned.

  In particular, the fluorescent dye is C.I. I. Solvent Yellow 98 or C.I. I. In the case of Solvent Orange 63, an oxalic acid anilide derivative such as Sanduvor VSU described above is preferable. The absorption peak of the oxalic acid anilide derivative is present at 320 nm.

  The proportion of this type of UV absorber is preferably 0.01 to 3.0 parts by weight when at least one of the transparent thermoplastic resin or the transparent thermoplastic elastomer is 100 parts by weight. If it is less than 0.01 part by weight, the effect of improving the weather resistance of the golf ball 10 is poor. Moreover, when it adds in the ratio exceeding 3.0 weight part, since a weather resistance will be saturated, it is disadvantageous in cost. A more preferable addition ratio is 0.05 to 2.5 parts by weight, and a further preferable addition ratio is 0.1 to 2.0 parts by weight.

  Alternatively, any one of titanium dioxide, zinc oxide, and a mixture thereof may be added to the cover 14. Even in this case, the weather resistance of the golf ball 10 can be improved.

  Here, it is preferable to add titanium dioxide or zinc oxide having an average particle size of 10 to 200 nm. If a material having a thickness of less than 10 nm is added, the weather resistance is not improved so much. Moreover, when the thing exceeding 200 nm is added, a cover will become whitish. What has an average particle diameter of 10-100 nm is still more preferable.

  Of course, when a mixture is added, a mixture of titanium dioxide and zinc oxide having an average particle diameter of preferably 10 to 200 nm, more preferably 10 to 100 nm may be used.

  As this kind of fine particle titanium dioxide, TTO-55 (average particle size = 30-50 nm), TTO-51 (average particle size = 10-30 nm), TTO-D-1 (dendritic particles) manufactured by Ishihara Sangyo Co., Ltd. And average major axis diameter = 200 to 300 nm, average minor axis diameter = 40 to 70 nm = average particle diameter) and the like. On the other hand, as specific examples of the fine zinc oxide, FZO-50 (average particle diameter = about 20 nm) manufactured by Ishihara Sangyo Co., Ltd., ZINCOX SUPER F-1 (average particle diameter = 100 nm) manufactured by Hakusui Tech Co., Ltd., ZINCOX SUPER F-2 (Average particle diameter = 65 nm).

  The addition ratio of titanium dioxide, zinc oxide, or a mixture thereof is preferably 0.01 to 1.0 part by weight when at least one of the transparent thermoplastic resin or the transparent thermoplastic elastomer is 100 parts by weight. If it is less than 0.01 part by weight, the effect of improving the weather resistance of the golf ball 10 is poor. On the other hand, if it exceeds 1.0 part by weight, the cover becomes whitish and the effect of improving the weather resistance is saturated, which is uneconomical.

  Furthermore, a hindered amine light stabilizer, a hindered phenol antioxidant, or a mixture thereof may be added to the cover, thereby improving the weather resistance of the golf ball 10. Specific examples of hindered amine light stabilizers include TINUVIN XT 855 / FF manufactured by Ciba Specialty Chemicals, while specific examples of hindered phenol antioxidants include Ciba Specialty Chemicals. IRGANOX 1010, IRGANOX 1076, etc. manufactured by the company are mentioned.

  The addition ratio of this type of light stabilizer, antioxidant, or a mixture of both is 0.01 to 2.0 parts by weight when at least one of the transparent thermoplastic resin or the transparent thermoplastic elastomer is 100 parts by weight. It is preferable to do. Similarly to the above, if it is less than 0.01 parts by weight, the effect of improving the weather resistance of the golf ball 10 is poor, and if it exceeds 2.0 parts by weight, the effect of improving the weather resistance is saturated, which is uneconomical.

  The above-described fluorescent dye, ultraviolet absorber, titanium dioxide, zinc oxide, antioxidant, light stabilizer, and the like may be simultaneously added to the cover 14.

  Further, in order to increase the durability of the cover 14, a clear paint may be applied on the cover 14. As the clear paint, those not containing a pigment can be used, and if the coating film has sufficient transparency, it may contain a fluorescent pigment, a fluorescent dye or the like.

  In the above-described embodiment, the two-piece solid golf ball has been described as an example. However, the golf ball according to the present invention has, for example, a single-layer solid core 20, an inner layer cover 22, and an outer layer as shown in FIG. A three-piece solid golf ball 28 having a cover 26 composed of two layers of the cover 24 may be used.

  In this case, the solid core 20 may be formed from, for example, a rubber composition containing polybutadiene rubber, zinc acrylate, dicumyl peroxide, zinc oxide, and the like, similar to the solid core 12.

  The inner layer cover 22 is preferably formed with a cover resin composition containing at least one of an ionomer resin and a thermoplastic elastomer as a main component. The inner layer cover 22 may be transparent like the inner layer cover in the conventional three-piece solid golf ball, or may be white by adding a white pigment such as titanium dioxide.

  Alternatively, a fluorescent dye may be added to the inner layer cover 22 in the same manner as the cover 14 so that the color is yellowish green, yellow or orange. Of course, if necessary, an ultraviolet absorber, an antioxidant, a light stabilizer and the like may be added, and further, a fluorescent brightener, a colorant and the like may be added.

  Furthermore, a non-fluorescent yellow pigment may be added to the inner layer cover 22 so that the inner layer cover 22 is colored yellow. As this type of yellow pigment, any of inorganic pigments, organic pigments, and mixtures thereof can be used. Of course, in this case, an ultraviolet absorber, an antioxidant, a light stabilizer, a fluorescent brightening agent, a coloring agent, and the like may be added.

  Examples of inorganic pigments include yellow iron oxide and titanium yellow. Examples of organic pigments include Hansa Yellow G, Hansa Yellow 10G, Benzidine Yellow, and Benzidine Yellow G.

  Thus, in the present invention, when the cover has two or more layers, it is not particularly necessary to color all the layers constituting the cover, and at least the outermost layer may be yellowish green, yellow or orange. The cover layer other than the outermost layer may be colored in the same manner as the outermost layer, or may be white.

  In this embodiment, the outer layer cover 24 is formed in the same manner as the cover 14 so that the outer layer cover 24 is colored yellow-green, yellow or orange. As a result, the three-piece solid golf ball 28 functions in the same manner as the golf ball 10 shown in FIG. Needless to say, clear paint may be applied on the outer layer cover 24.

  The golf ball according to the present invention is not limited to the two-piece solid golf ball 10 and the three-piece solid golf ball 28 described above, but a multi-piece solid golf ball composed of a single-layer solid core and three-layer or more covers. It may be a multi-piece solid golf ball composed of two or more layers of solid core and one or more layers of cover.

  The solid core 20 was made of a rubber composition in which cis-1,4-polybutadiene was used as a base rubber and zinc acrylate, zinc oxide, and dicumyl peroxide were mixed with the base rubber.

  Next, the weight ratio of Perprene GP-400 (trade name of a polyester elastomer manufactured by Toyobo Co., Ltd.) and X-22-22355 (trade name of a silicone-modified thermoplastic elastomer manufactured by Shin-Etsu Chemical Co., Ltd.) is 40:60. The mixture mixed at a ratio was injection molded onto the solid core 20 to form an inner layer cover 22. This inner layer cover 22 was a substantially transparent body having a slight yellowish color.

  Next, a 36:36:28 mixture of Surlyn 8946, Surlyn 9945, Surlyn 6120 (both trade names of ionomer resins manufactured by DuPont Polychemical Co., Ltd.), that is, C.I. I. Solvent Yellow 98 Hostasol Yellow 3G (trade name of Clariant's yellow fluorescent dye) and Sanduvor VSU (trade name of Clariant's UV absorber) which is an oxalic acid anilide derivative were used as cover materials. . The ratios of the fluorescent dye and the ultraviolet absorber to 100 parts by weight of the cover resin composition were 0.1 parts by weight and 0.3 parts by weight, respectively.

  This cover material was injection-molded on the above-described inner layer cover 22 to form an outer layer cover 24, and then a clear paint was applied on the outer layer cover 24 to obtain a three-piece solid golf ball 28. This is Example 1.

  The fluorescent dye added to the cover material is C.I. I. A three-piece solid golf ball 28 was produced in the same manner as in Example 1 except that the solvent orange 63 was changed to 0.03 parts by weight of Hostasol Red GG (trade name of orange fluorescent dye manufactured by Clariant). . This is Example 2.

  Further, another three-piece solid golf ball 28 was produced as follows. That is, first, after providing the solid core 20 in accordance with Example 1, Surlyn 9150, Surlyn 8150 (both trade names of ionomer resin manufactured by DuPont Polychemical Co., Ltd.) are in a weight ratio of 50:50, 0.045 parts by weight of non-fluorescent yellow pigment Titanium Yellow 42-120A (trade name manufactured by Toago Material Technology Co., Ltd.), titanium dioxide CR-60-2 (trade name of white pigment manufactured by Ishihara Sangyo Co., Ltd.) ) Was added, and an inner layer cover 22 was formed.

  Next, with respect to 100 parts by weight of a 60:20:20 mixture (resin composition for cover) of Surlyn 6320, Surlyn 1855, Surlyn 1856 (all of which are trade names of ionomer resins manufactured by DuPont Polychemical Co., Ltd.), Nuclerel 1050H ( 2 parts by weight of an ethylene-methacrylic acid copolymer product manufactured by DuPont Polychemical Co., Ltd. was added, and the fluorescent dye Hostasol Yellow 3G, titanium dioxide TTO-D-1, and zinc oxide ZINCOX SUPER F -1, TINUVIN XT 855 / FF which is a hindered amine light stabilizer, and IRGANOX 1010 which is a hindered phenol antioxidant are 0.1 parts by weight, 0.08 parts by weight, 0.08 parts by weight, 0 0.08 parts by weight and 0.3 parts by weight did.

  This cover material was injection molded onto the inner layer cover 22 to form an outer layer cover 24, and then a clear paint was applied onto the outer layer cover 24 to form a three-piece solid golf ball 28. This is Example 3.

  For comparison, with respect to 100 parts by weight of ionomer resin, 2.73 parts by weight of ZQ-15 (trade name of yellow fluorescent pigment made by Digro) and titanium dioxide A-220 (trade name of white pigment made by Ishihara Sangyo Co., Ltd.) A three-piece solid golf ball was produced according to Example 1 except that 0.07 part by weight was added to obtain a cover raw material. This is referred to as Comparative Example 1.

For each of the three-piece solid golf balls of Examples 1 to 3 and Comparative Example 1, the color tone of the ball surface was measured using a color difference meter CR-300 manufactured by Konica Minolta Co., Ltd., and the lightness L ^* and chromaticity a ^* were measured ^. The chromaticity b ^* was examined, and the saturation and 1.2 × L ^* were calculated.

  Further, the golf ball was placed on the green, and visibility was evaluated by judging whether or not the golf ball was easily recognized from a point 70 mm away. The results are also shown in FIG. In addition, the visibility was set as ◯ when it was clearly visible and △ when it was difficult to see. From FIG. 2, it is clear that the three-piece solid golf ball 28 of Examples 1 to 3 has better visibility than the golf ball of Comparative Example 1.

1 is a schematic overall cross-sectional view of a golf ball according to an embodiment. It is a schematic whole sectional view of a golf ball concerning another embodiment. 5 is a chart showing the color tone and visibility of a cover in golf balls of Examples 1 to 3 and Comparative Example 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Two piece solid golf ball 12, 20 ... Solid core 14, 26 ... Cover 22 ... Inner layer cover 24 ... Outer layer cover 28 ... Three-piece solid golf ball

Claims (18)

In a golf ball having a cover on the outermost surface,
When the color tone of the surface of the cover is expressed in the CIE / L ^* a ^* b ^* color system, the lightness L ^* is 50 or more, the chromaticity a ^* is −20 or less or +20 or more, and the chromaticity b ^* is +35 or more. A golf ball characterized by being. 2. The golf ball according to claim 1, wherein the lightness L ^* , the chromaticity a ^*, and the chromaticity b ^* satisfy the following formula (1).

  3. The golf ball according to claim 1, wherein the cover is colored by adding at least one fluorescent dye to at least one of a transparent thermoplastic resin or a transparent thermoplastic elastomer.   4. The golf ball according to claim 3, wherein the fluorescent dye is at least one selected from the group of naphthalimide-based, thioxanthene-based, perylene-based and thioindigo-based dyes.   5. The golf ball according to claim 4, wherein the fluorescent dye is C.I. I. Solvent Yellow 98 or C.I. I. A golf ball comprising Solvent Orange 63.   6. The golf ball according to claim 4 or 5, wherein at least one of the transparent thermoplastic resin or the transparent thermoplastic elastomer is 100 parts by weight, the fluorescent dye is added in a proportion of 0.005 to 3.0 parts by weight. A golf ball characterized by being made.   The golf ball according to claim 3, wherein an ultraviolet absorber is added to the cover.   8. The golf ball according to claim 7, wherein the ultraviolet absorber has an absorption peak in a wavelength range of less than 340 nm and no absorption peak in a wavelength range of 340 to 400 nm.   9. The golf ball according to claim 8, wherein the ultraviolet absorber is an oxalic anilide ultraviolet absorber or a malonic ester ultraviolet absorber.   10. The golf ball according to claim 7, wherein the ultraviolet absorber is 0.01 to 3 when 100 parts by weight of at least one of the transparent thermoplastic resin or the transparent thermoplastic elastomer is 100 parts by weight. A golf ball added at a ratio of 0.0 part by weight.   8. The golf ball according to claim 7, wherein the fluorescent dye is C.I. I. Solvent Yellow 98 or C.I. I. A golf ball comprising Solvent Orange 63 and the ultraviolet absorber being an oxalic acid anilide derivative.   The golf ball according to claim 3, wherein at least one of titanium dioxide and zinc oxide is added to the cover.   The golf ball according to claim 12, wherein the titanium dioxide or the zinc oxide has an average particle diameter of 10 to 200 nm.   14. The golf ball according to claim 13, wherein the titanium dioxide or the zinc oxide has an average particle size of 100 nm or less.   The golf ball according to any one of claims 3 to 14, wherein at least one of the transparent thermoplastic resin or the transparent thermoplastic elastomer is 100 parts by weight, the titanium dioxide, the zinc oxide, or these A golf ball characterized in that the mixture is added at a ratio of 0.01 to 1.0 part by weight.   16. The golf ball according to claim 3, wherein at least one of a hindered amine light stabilizer or a hindered phenol antioxidant is added to the cover.   17. The golf ball according to claim 16, wherein at least one of the transparent thermoplastic resin or the transparent thermoplastic elastomer is 100 parts by weight, the hindered amine light stabilizer, the hindered phenol antioxidant, or these A golf ball characterized in that the mixture is added at a ratio of 0.01 to 2.0 parts by weight.   18. The golf ball according to claim 1, wherein an inner layer colored with a non-fluorescent yellow pigment is provided inside the cover.

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