JP2003190325A - Golf ball - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gold ball having a marking excellent in brightness since a sufficient color flopping property can be obtained with a small amount of a polarizing material, and excellent in durability since the content of the polarizing material in an ink composition can be reduced is applied by blending the polarizing material and a dye having a small covering power in the ink composition. <P>SOLUTION: The marking is applied with the ink composition containing the polarizing material and the dye as essential components. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a marked golf ball, and more particularly to a marked golf ball having excellent glitter and durability.

[0002]

2. Description of the Related Art Usually, the surface of a golf ball is marked with letters, numbers or patterns representing the product name or number. 2. Description of the Related Art In recent years, there has been an increasing demand for golf balls that have markings that have a high-quality feel and that have a personalized appearance. In response to such a demand, a golf ball has been proposed in which a polarizing material and a pigment are mixed in a marking ink to carry out marking using a color effect due to an interference effect of light (Japanese Patent Laid-Open No. 11-1999).
-114093, JP-A-11-319147, etc.).

Japanese Patent Laid-Open No. 11-114093 discloses a golf ball which is marked with an ink composition containing a pigment and a metal powder.

Japanese Unexamined Patent Publication (Kokai) No. 11-319147 discloses a golf ball having a marking with a predetermined pattern on its surface, which is formed by an ink composition containing a component having a property of expressing gloss. A golf ball characterized by the above is disclosed.

However, the marking of the golf ball must have sufficient durability to withstand the impact of repeated impacts. Generally, when a large amount of a material having a large particle size such as a polarizing material is mixed in an ink composition, there is a problem that the durability of marking is lowered. On the other hand, if the blending amount of the polarizing material is small, there is a problem in that the so-called color flop property becomes insufficient because the color tone changes depending on the viewpoint due to the hiding power of the pigment.

[0006]

SUMMARY OF THE INVENTION The present invention solves the problems associated with the conventional marking golf balls as described above, and provides a marking golf ball having excellent glitter and durability. The purpose is to provide.

[0007]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies to achieve the above object, and as a result, by adding a polarizing material and a dye having a small hiding power to a marking ink composition, a small amount of Even if the polarizing material is used, the color flop property is sufficiently obtained, so that the golf ball is excellent in brilliance, and it is possible to reduce the content of the polarizing material in the ink composition. They have found that they can be provided and have completed the present invention.

That is, the present invention relates to a golf ball, which is marked with an ink composition containing a polarizing material and a dye as essential components.

Furthermore, in order to preferably carry out the present invention, the surface of the polarizing material is colored; the color of the surface of the colored polarizing material and the color of the dye in the ink composition are different; Is a mixture of one or more selected from the group consisting of metal flakes, mica foil and pearl powder; the content of the polarizing material is 3 to 20 parts by weight with respect to 100 parts by weight of the ink composition. Is preferred.

In the marking applied to the golf ball of the present invention, by coloring the surface of the polarizing material as described above and including a dye of a color different from the surface of the polarizing material in the ink composition, the marking color change width Will spread even more.

Here, both the pigment and the dye are pigments used for coloring an object. In the present specification, the pigment, water, oil, which is generally called a pigment,
It is a white or colored inorganic compound and organic compound that is insoluble in a medium such as a solvent, and includes so-called transparent organic pigments, and does not include pigments such as metal flakes, mica foil, and pearl powder used as a polarizing material in the present invention. On the other hand, the dye is a coloring component other than the above-mentioned pigment or polarizing material, and is a colored organic compound that is soluble in a medium such as water, oil, or solvent.

The golf ball of the present invention is not dependent on the structure, and may be a solid golf ball such as a one-piece ball, a two-piece ball, a multi-piece ball of three or more pieces, or a wound golf ball.

In the case of a solid golf ball, the core (solid core) used in the one-piece golf ball or the solid golf ball may be one conventionally used, for example, 100 parts by weight of a base rubber such as polybutadiene rubber. On the other hand, α, β-unsaturated carboxylic acids having 3 to 8 carbon atoms such as acrylic acid and methacrylic acid, or their monovalent or divalent metal salts such as zinc and magnesium, and trimethylolpropane trimethacrylate. 10 to 60 parts by weight of a vulcanizing agent (crosslinking agent) composed of the functional monomer described above, 0.5 to 5 parts by weight of a co-crosslinking initiator such as an organic peroxide, filling with zinc oxide, barium sulfate or the like. The rubber composition containing 10 to 30 parts by weight of the material, if necessary, an antioxidant and the like is uniformly kneaded using an appropriate kneading machine such as an ordinary kneading roll, It can be obtained spherical core by vulcanization molding the inner. The conditions at this time are not particularly limited, but usually 130 to 240 ° C., pressure 2.9 to 1
It is performed at 1.8 MPa for 15 to 60 minutes. The surface of the obtained core is preferably buffed in order to improve the adhesion with the cover around it. Furthermore, the solid core may have a single-layer structure or a multi-layer structure of two or more layers.

Further, the core (thread-wound core) used in the thread-wound golf ball may be one conventionally used, and a thread formed by winding a thread rubber around the center and around the center in a stretched state. It consists of a rubber layer. Liquid center (liquid center)
Alternatively, any rubber type (solid center) may be used. The thread rubber wound on the center may be the same as that conventionally used in the thread wound layer of a thread wound golf ball. For example, natural rubber or natural rubber and synthetic polyisoprene may have sulfur or vulcanization. You may use what was obtained by vulcanizing the rubber composition which mix | blended an auxiliary agent, a vulcanization accelerator, an antioxidant, etc. The rubber thread is stretched about 10 times on the center and wound to form a wound core. However, these solid cores and wound cores are merely examples, and the present invention is not limited to these.

A cover layer is coated on the core obtained as described above. As a cover material, an ionomer resin, a thermoplastic resin such as a thermoplastic elastomer, a balata or a hard rubber or the like is usually used as a cover for a golf ball. It is not limited as long as it is used. In the cover material, if necessary, in addition to the base resin as the main component,
Fillers such as barium sulfate and colorants such as titanium dioxide,
Other additives, such as dispersants, antioxidants, ultraviolet absorbers, light stabilizers and fluorescent materials or optical brighteners,
It may be contained in a range that does not impair the desired properties of the golf ball cover. The covering of the cover can be formed using a generally known method used for forming the cover, and is not particularly limited. The composition for a cover is previously formed into a half shell having a hemispherical shell shape, and two solid shells are used to wrap the solid core and pressure molding is performed. Alternatively, the composition for a cover is directly injection-molded onto the core to form a core. A wrapping method may be used. When forming the cover, a depression called a dimple is usually formed on the surface.

Further, the surface of the cover is marked, and a clear paint layer is applied to finish the golf ball. In order to improve the adhesion of marking and paint, it is desirable to perform a pretreatment such as polishing the surface of the cover appropriately. The golf ball of the present invention is required to be marked with an ink composition containing a polarizing material and a dye as essential components. The ink composition contains a base resin, an additive, a solvent and the like in addition to the polarizing material and the dye.

Examples of the polarizing material include metal flakes such as aluminum flakes, mica, pearl powder, shell powder, and scales, and metal flakes, mica, and pearl powder are preferable.

The particle size of the polarizing material is 5 to 200 μm.
m, preferably 7 to 150 μm, more preferably 10 to
It is 100 μm. The particle size of the polarizing material is 200 μm
If it is larger, the durability of the obtained marking is poor, and it is 5μ.
If it is smaller than m, the color flop property is poor.

The above polarizing material has an average particle size of 10 to 150.
μm, preferably 15 to 100 μm, more preferably 2
It is 0 to 70 μm. The average particle size of the polarizing material is 150
If it is larger than μm, the durability of the obtained marking is poor,
If it is less than 10 μm, the color flop property is poor.

The blending amount of the above-mentioned polarizing material is the ink composition 1
It is preferably 3 to 20 parts by weight, 3 to 15 parts by weight, and 5 to 15 parts by weight with respect to 00 parts by weight. If the blending amount of the above-mentioned polarizing material exceeds 20 parts by weight, the durability of marking is lowered, and if it is less than 3 parts by weight, the color flop property becomes insufficient and sufficient glittering properties cannot be obtained.

It is desirable that the surface of the polarizing material be colored.

The above dyes are metal-containing complex salt dyes such as So.
lvent Yellow 81, Solvent B
rack 27; acid dyes such as Acid Yell
ow1, Acid Red 4, Acid Black
2; Direct dyes such as Direct Yellow
1, Direct Black 4; and the like, and metal-containing complex salt dyes are preferable.

The amount of the above-mentioned dye compounded is 100
0.3-10.0 parts by weight, 0.5-
It is preferably 7.0 parts by weight. When the compounding amount of the above dye exceeds 10.0 parts by weight, it becomes insoluble in the solvent,
If it is less than 0.3 part by weight, the coloring power is weak.

Further, in the marking ink composition of the present invention, since the color change width of the marking obtained is further widened, the color of the surface of the above-mentioned colored polarizing material and the color of the dye in the ink composition are different. Is desirable.

As the above-mentioned base resin, those which are usually used in marking inks for golf balls can be used and are not particularly limited, but polyester resins,
Examples thereof include epoxy resin, nitrified cotton, acrylic resin, vinyl chloride-vinyl acetate copolymer, urethane resin, polyamide resin, and the like, and epoxy resin, polyester resin, nitrified cotton and the like are preferable. For example, when epoxy resin (terminal hydroxyl group type) is used, hexamethylene diisocyanate, isophorone diisocyanate, tolylene diisocyanate and the like are preferable as the curing agent.

The blending amount of the above-mentioned base resin is the ink composition 1
15 to 50 parts by weight, preferably 2 to 100 parts by weight
It is 0 to 45 parts by weight, more preferably 25 to 40 parts by weight. If the amount of the above-mentioned base resin compounded is less than 15 parts by weight, the adhesion of the marking to the golf ball body will decrease, and
If the amount is more than parts by weight, the blending amount of the solvent and the dye is relatively reduced and the chromaticity of the marking becomes light.

Examples of the above additives include matting agents and defoaming agents. Colloidal silica, low density polyethylene, medium density polyethylene and the like can be used as the matting agent, and methylsiloxane is used as the defoaming agent. Etc. can be used. As the additive, the amount of the matting agent is preferably 0.5 to 5 parts by weight, and the amount of the defoaming agent is preferably 0.5 to 5 parts by weight, based on 100 parts by weight of the ink composition.

As the above-mentioned solvent, those which are usually used in marking inks for golf balls can be used, and are not particularly limited, but cyclohexanone, acetylacetone, propylene glycol monomethyl ether acetate, methoxymethylbutyl acetate, ethyl acetate, Examples thereof include aromatic hydrocarbons and the like, or a mixed solvent of two or more thereof.

The blending amount of the above solvent is 100
20-60 parts by weight, preferably 25-
55 parts by weight, more preferably 30 to 50 parts by weight.
If the amount of the solvent is less than 20 parts by weight, the ink viscosity becomes too high and the printing workability is deteriorated. If the amount is more than 60 parts by weight, it takes a long time to dry after the marking is formed and the productivity is decreased.

At present, the ball weight is specified to be 45.92 g or less in the case of a large size ball, but
There is no standard for the lower limit. The golf ball of the present invention is
Weight 44.0-45.8g, preferably 44.2-4
Having 5.8 g. When the weight of the ball is less than 44.0 g, inertia during flight is lost, and the ball stalls in the latter half of the flight to reduce the flight distance. When it is more than 45.8 g, the shot feeling becomes heavy and bad.

The diameter of the golf ball of the present invention is 4
The thickness can be 1.0 to 44.0 mm, but it is preferably 42.67 mm or more, which is suitable for the specifications of large size balls, and is usually about 42.75 mm.

[0032]

EXAMPLES Next, the present invention will be described in more detail by way of examples. However, the present invention is not limited to these examples.

Manufacture of core A rubber composition for cores having the composition shown in Table 1 below was kneaded and heated and pressed at 160 ° C. for 13 minutes in upper and lower molds having hemispherical cavities to obtain spherical particles having a diameter of 39.3 mm. Got the core of.

[0034]

[Table 1]

(Note 1) Product name "BR1" from JSR Corporation
1 ”commercially available polybutadiene rubber

Preparation of Cover Composition The materials having the formulations shown in Table 2 below were mixed by a twin-screw kneading extruder to prepare a pellet-shaped cover composition. The extrusion conditions were a screw diameter of 45 mm, a screw rotation speed of 200 rpm, and a screw L / D of 35, and the compound was heated to 200 to 260 ° C. at the position of the die of the extruder.

[0037]

[Table 2]

(Note 2) Trade name, sodium ion neutralized ethylene-methacrylic acid copolymer type ionomer resin manufactured by Mitsui DuPont Polychemical Co., Ltd. (Note 3) Trade name, zinc ion manufactured by Mitsui DuPont Polychemical Co., Ltd. Neutralized ethylene-methacrylic acid copolymer type ionomer resin (Note 4) Trade name, sodium ion neutralized ethylene-methacrylic acid copolymer type ionomer resin manufactured by Mitsui DuPont Polychemical Co., Ltd.

(Examples 1 to 8 and Comparative Examples 1 to 3) The cover composition was formed by directly injection-molding the above-mentioned cover composition onto the core obtained as described above, and a diameter of 4
A two-piece golf ball body having 2.7 mm was made. The upper and lower molds for molding the cover have hemispherical cavities, are provided with dimples, and part of the dimples also serves as a hold pin capable of advancing and retracting. The above-mentioned hold pin is ejected, the core is thrown in and held, and the resin heated to 210 ° C. is injected into the mold clamped with a pressure of 80 tons in 0.3 seconds, cooled for 30 seconds and the mold is opened to open the golf ball. Took out. After sandblasting the surface of the golf ball, marking is performed by pad printing with an ink composition having the composition shown in Tables 3 and 4 below.
A golf ball was finished by applying clear paint.
With respect to the marking on the surface of the obtained golf ball, the color effect and the durability were evaluated, and the results are shown in the same table. The test method was as follows.

(Test Method) (1) Color Effect The color effect was evaluated by visually observing the surface of each golf ball after marking. The evaluation criteria are as follows. Evaluation Criteria ⊚: Rich in color flop property and particularly good in appearance. ◯: Color flop property is recognized and it looks good. Δ: Color flop property is slightly recognized. X: Color flop property is not recognized and appearance is poor.

(2) Marking Durability A swing robot manufactured by Trutemper Co., Ltd. was fitted with a Wood No. 1 club (W # 1, driver), and a head speed of 4 was applied.
After repeatedly hitting each golf ball 100 times at 5 m / sec, the degree of marking peeling was evaluated by visual observation.
The evaluation criteria are as follows. Evaluation Criteria (Marking) ◎: No marking peeling ○: Marking peeling less than 1 mm △: Marking peeling more than 1 mm and less than 2 mm ×: Marking peeling more than 2 mm

[0042]

[Table 3]

[0043]

[Table 4]

(Note 5): Hexamethylene diisocyanate (Note 6): Mixed solvent shown in Table 5 below (Note 7): Matting agent (Note 8): Average particle size 50 μm, Thickness 25 μm (Note 9): It was prepared by coloring the surface of an aluminum thin piece having an average particle size of 50 μm and a thickness of 25 μm. (Note 10): It was prepared by coloring the surface of an aluminum flakes having an average particle size of 50 μm and a thickness of 25 μm. (Note 11): "Zapon Yellow" manufactured by BASF.
141 (trade name) "(Note 12):" Zapon Black X "manufactured by BASF
51 (trade name) "

[0045]

[Table 5]

From the above results, the golf balls of Examples 1 to 6 of the present invention have better marking durability and color flop properties than the golf balls of Comparative Examples 1 to 3, It can be seen that the golf ball has an excellent marking color effect.

The golf balls of Examples 7 and 8 which are within the scope of the present invention are superior to the golf balls of Comparative Examples, but are slightly inferior in characteristics as compared with the golf balls of Examples 1-6. Met. The golf ball of Example 7 was slightly inferior in color effect due to the small amount of the polarizing material compounded, and the golf ball of Example 8 was slightly inferior in marking durability due to the large amount of the polarizing material compounded.

On the other hand, the golf ball of Comparative Example 1 has a color flop property because the marking ink composition contains a pigment having a large hiding power in addition to the polarizing material, but no dye is used. Was slightly observed, and the color effect was not sufficiently obtained.

The golf ball of Comparative Example 2 contains a pigment having a large hiding power in addition to the polarizing material, but no dye is used. However, since there are many polarizing materials, the coloring effect is sufficiently obtained, but the marking durability is high. Was bad.

In the golf ball of Comparative Example 3, the dye was used, but the polarizing material was not used. Therefore, the color flop property was not recognized and the color effect was insufficient.

[0051]

According to the present invention, by mixing a polarizing material and a dye having a small hiding power in the marking ink composition, a sufficient color flop property can be obtained even with a small amount of the polarizing material, so that the glittering property is excellent. Further, since it is possible to reduce the content of the polarizing material in the ink composition, it is possible to provide a golf ball having a marking excellent in durability.

Claims (5)

[Claims] 1. A golf ball, which is marked with an ink composition containing a polarizing material and a dye as essential components. 2. The golf ball according to claim 1, wherein the polarizing material has a colored surface. 3. The golf ball according to claim 2, wherein the color of the surface of the colored polarizing material and the color of the dye in the ink composition are different. 4. The golf ball according to claim 1, wherein the polarizing material is one kind or a mixture of two or more kinds selected from the group consisting of metal flakes, mica foil and pearl powder. 5. The content of the polarizing material is 3 to 20 parts by weight with respect to 100 parts by weight of the ink composition.
5. The golf ball according to any one of 4 to 4.