JP3293679B2 - Solid golf ball - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid golf ball comprising a white rubber composition.

[0002]

2. Description of the Related Art Generally, solid golf balls include one-piece golf balls and multilayer golf balls represented by two-piece golf balls. A one-piece golf ball obtained by integrally molding a body portion made of a rubber composition is used as a practice range ball because it is easy to manufacture and inexpensive, and a core made of the rubber composition is used as an ionomer resin cover or the like. The multi-layered golf ball obtained by coating with, is used as a round ball because of its good resilience.

[0003] Normally, a solid paint is applied to these solid golf balls after a white paint is applied to make the surface of the ball clear white. However, since the color of the main body portion of the ball or the ionomer resin cover is different from the color of the white paint, when the ball is repeatedly hit and the white paint layer is peeled off, there is a problem that the appearance becomes unsightly.

[0004] Therefore, among the multi-layered golf balls having an ionomer resin cover, there is a ball in which the white paint is omitted and only the clear paint is applied. In this ball, the ionomer resin cover itself is made clear white in order to obtain bright and vivid whiteness without applying a white paint.

[0005] On the other hand, in one-piece golf balls, attempts have been made to omit the coating of white paint. However, it has been extremely difficult to make the main body of the ball bright white like an ionomer resin cover.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a vivid whiteness. Even when a paint layer is peeled off, the appearance is clear. It is an object of the present invention to provide a solid golf ball that can maintain the golf ball.

[0007]

In order to achieve the above-mentioned object, a solid golf ball of the present invention comprises titanium oxide,
A rubber composition containing a specific amount of each of a blue pigment and a purple pigment is used as a main body, and a clear paint is applied thereto.
Ru Oh in the one-piece solid golf ball comprising Te.

That is, according to the present invention, 2 to 12 parts by weight of titanium oxide is added to 100 parts by weight of a base rubber, and a blue pigment and a violet pigment are added in an amount of 0.0001 to 0.0001.
The composition is characterized by comprising a composition containing 0.04 parts by weight and a weight ratio of blue pigment / purple pigment in a ratio of 15/85 to 65/35.

As the base rubber, butadiene rubber (B
R), ethylene propylene diene rubber (EPD)
M), isoprene rubber (IR), butyl rubber (II
R), natural rubber (NR), acrylonitrile-butadiene rubber (NBR), styrene-butadiene rubber (SB
R), silicone rubber (SiR), urethane rubber (UR)
Etc. can be used.

In the present invention, the base rubber is cis 1,
Polybutadiene rubber containing 40% or more of 4 bonds is particularly preferred. In addition, natural rubber,
Butyl rubber, acrylonitrile / butadiene rubber and the like may be appropriately compounded.

Titanium oxide is blended in an amount of 2 to 12 parts by weight based on 100 parts by weight of the base rubber, and acts as a white pigment. If the amount of titanium oxide is less than 2 parts by weight, the whiteness is low. Conversely, if the blending amount is more than 12 parts by weight, rebound,
Poor durability. Titanium oxide is classified into an anatase type and a rutile type depending on the crystal structure, but a rutile type titanium oxide having high weather resistance is preferable. In addition, when titanium oxide that has been appropriately surface-treated with a hydrated oxide of aluminum and / or silicon is used, the compoundability with rubber is good. As blue pigments, ultramarine blue (ultramarine blue), cobalt blue, fast sky blue, phthalocyanine blue, navy blue (Prussian blue) and the like can be used. As purple pigments, anthraquinone violet, dioxazine violet, methyl violet and the like can be used. . The total amount of the blue pigment and the purple pigment is 0.0001 to 0.04 parts by weight, preferably 0.001 to 0.03 parts by weight, based on 100 parts by weight of the base rubber, and the blue pigment / purple pigment is used. The pigment is blended in a weight ratio of 15/85 to 65/35. The total blending amount of the blue pigment and the purple pigment is 0.
If the amount is less than 0001 parts by weight, whiteness becomes yellowish and 0.0
If the amount is more than 4 parts by weight, the white appears blueish. Also,
Even if the weight ratio deviates from the ratio of 15/85 to 65/35, the whiteness is insufficient.

In the present invention, α, β-unsaturated carboxylic acids, metal salts, organic peroxides and fillers conventionally used in solid golf balls can be appropriately compounded.

As the α, β-unsaturated carboxylic acid and its metal salt, any one or more of acrylic acid, methacrylic acid, zinc acrylate, zinc methacrylate and the like can be used. The amount is not particularly limited, but is usually 10 to 45 parts by weight, preferably 20 to 35 parts by weight, per 100 parts by weight of the base rubber. If the amount is out of the range, a ball having excellent resilience and durability cannot be obtained.

Examples of the organic peroxide include dicumyl peroxide, n-butyl-4,4-bis (t-butylperoxy) valerate, and 1,1-bis (t-butylperoxy) -3,3. , 5-trimethylcyclohexane and the like can be used. The compounding amount is not particularly limited, but is usually 0.5 to 6 parts by weight, preferably 2 to 5 parts by weight based on 100 parts by weight of the base rubber. If the compounding amount is out of the range, a ball having an optimum hardness cannot be obtained.

As the filler, any one or more of zinc oxide, silica, calcium carbonate, barium sulfate and the like can be used. Although the amount is not particularly limited, it is usually 10 to 35 parts by weight per 100 parts by weight of the base rubber.
Parts by weight, preferably 15 to 25 parts by weight.

Further, in the present invention, in addition to the above-mentioned components, for example, higher fatty acids, antioxidants and the like can be appropriately compounded.

The solid golf ball of the present invention is obtained by pressurizing and heating the above rubber composition. The surface may be coated with clear paint only once or twice or more,
Conventionally, a white paint may be applied, and a clear paint may be applied thereon.

[0018]

Next, the present invention will be described in detail with reference to examples. In Examples 1 to 5 and Comparative Examples 1 to 3 , as shown in Table 1, cis-1,4-polybutadiene (BR-11, manufactured by Nippon Synthetic Rubber Co., Ltd.) 1
00 parts by weight, 15 parts by weight of methacrylic acid, 10 parts by weight of zinc methacrylate, 20 parts by weight of zinc oxide (manufactured by Hakusui Chemical Co., Ltd., No. 3 zinc white), and titanium oxide (manufactured by Ishihara Sangyo Co., Ltd. CR-60), 5 parts by weight of phthalocyanine blue and dioxazine violet in a total amount of 0.005 parts by weight and 2.5 parts by weight of dicumyl peroxide (manufactured by NOF CORPORATION, Bark Mill D). Was pressed and heated in a mold, and then coated with a clear paint to obtain a one-piece golf ball. Here, the weight ratio of phthalocyanine blue / dioxazine violet was 33/67.

The one-piece golf balls of Examples 2 to 5 and Comparative Examples 1 to 3 were produced in the same manner as in Example 1 by the rubber compounding shown in Table 1. The physical properties and appearance of the obtained golf ball were measured and are shown in Table 1.

[0020]

[Table 1]

* 1 BR-11 manufactured by Nippon Synthetic Rubber Co., Ltd. * 2 No. 3 zinc flower manufactured by Shiramizu Chemical Industry Co., Ltd. * 3 Nip Seal ER manufactured by Nippon Silica Industry Co., Ltd. * 4 Taipaque CR- manufactured by Ishihara Sangyo Co., Ltd. 60 * 5 Bark Mill D * 6 manufactured by NOF CORPORATION, using a swing robot (manufactured by True Temper) with a head speed of 40 m using the No. 1 wood club.
The value when hit at / sec was measured. * 7 An index based on the durability of a conventional one-piece ball (Comparative Example 1) as 100. * 8 Evaluated by measuring with a colorimeter (manufactured by Minolta Camera Co., Ltd.) and visually judging.

◎ Extremely good ○ Good △ Normal × Bad Examples 6 to 12 and Comparative examples 4 to 6 One-piece golf balls of Examples 6 to 12 and Comparative examples 4 to 6 were produced by rubber compounding shown in Table 2, and physical properties were obtained. The measurement and appearance evaluation were performed, and the results are shown in Table 2.

[0023]

[Table 2]

[0024]

According to the solid golf ball of the present invention, a vivid whiteness of the main body of the ball made of the rubber composition can be obtained by a predetermined blend of titanium oxide, a blue pigment and a purple pigment. Since the main body has a vivid whiteness, sufficient whiteness can be obtained even if only the clear paint is applied thereto. In addition, when the white paint layer is applied as before, even if the white paint layer peels off, the appearance of the ball becomes unsightly because the color difference between the white paint layer and the surface of the ball itself is inconspicuous. There is no.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-311970 (JP, A) JP-A-61-119283 (JP, A) JP-A-3-133471 (JP, A) 41589 (JP, B1) (58) Field surveyed (Int. Cl. ⁷ , DB name) A63B 37/00-37/14

Claims (2)

(57) [Claims] 1. A blend of 2 to 12 parts by weight of titanium oxide with respect to 100 parts by weight of a base rubber, 0.0001 to 0.04 parts by weight of a blue pigment and a violet pigment, and a blue pigment / purple 15/85 to 65/3
In the main part made of the composition to be blended at a ratio of 5 , clear
A solid golf ball having a one-piece structure formed by applying a paint . 2. The solid golf ball according to claim 1, wherein the base rubber is a polybutadiene rubber containing at least 40% of cis-1,4 bonds.