JP3293694B2 - One piece 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 one-piece solid golf ball obtained by applying a clear coating to a main body made of a white rubber composition.

[0002]

2. Description of the Related Art Conventionally, a one-piece solid golf ball has been coated with a white paint and then a clear paint in order to make the surface of the ball clear white. However, since the color of the white paint and the color of the main body of the ball are different, if the ball is repeatedly hit and the white paint layer peels off, there is a problem that the appearance becomes unsightly.

Therefore, attempts have been made to apply only the clear paint without using the white paint. However, the appearance of the clear paint layer is easily deteriorated and the clear paint layer is easily peeled off as compared with a golf ball coated with the white paint. There was a disadvantage.
That is, in order to omit the application of the white paint, the main body of the ball made of the rubber composition needs to be made bright white, but sufficient whiteness cannot be imparted. In addition, since the white paint is omitted, the deterioration of the ball body due to the oxidation reaction is increased, the adhesion between the ball body and the clear paint layer is reduced, and the clear paint layer is liable to peel off.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and provides a one-piece ball having a bright white appearance and a high adhesion between a ball body and a clear paint layer. It is an object to provide a solid golf ball.

[0005]

According to the present invention, a ball body comprises a base rubber, an α, β-unsaturated carboxylic acid and / or a metal salt thereof, an organic peroxide, and a filler. In a one-piece solid golf ball comprising a composition, the composition contains 2 to 12 parts by weight of titanium oxide based on 100 parts by weight of a base rubber, and 100 parts by weight of a blue pigment and a violet pigment based on 100 parts by weight of a base rubber. 0.00
It is characterized in that a clear paint containing an antioxidant and / or a light stabilizer is applied to the main body of the ball in an amount of from 0.01 to 0.04 parts by weight.

In the present invention, a base rubber, an α, β-unsaturated carboxylic acid and / or a metal salt thereof, an organic peroxide and a filler conventionally used in one-piece solid golf balls are used.

As a 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)
And the like, and any one or more of them are used.
In particular, it is preferable to use a polybutadiene rubber containing 40% or more of cis-1,4 bonds. Natural rubber, butyl rubber, acrylonitrile-butadiene rubber, or the like may be appropriately blended with the polybutadiene rubber.

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 are used. Examples of the organic peroxide include dicumyl peroxide, n-butyl-4,4-bis (t-
(Butylperoxy) valerate, 1,1-bis (t-butylperoxy) -3,3,5-trimethylcyclohexane and the like are used. As the filler, for example, zinc oxide,
Any one or more of silica, calcium carbonate, barium sulfate and the like are used.

The one-piece solid golf ball of the present invention comprises titanium oxide, a blue pigment and a violet pigment in a composition containing the above components. Titanium oxide acting as a white pigment preferably has a rutile crystal structure, and is blended in an amount of 2 to 12 parts by weight based on 100 parts by weight of the base rubber. Examples of blue pigments include ultramarine blue (ultramarine blue), cobalt blue, fast sky blue, phthalocyanine blue, and dark blue (Prussian blue), and examples of purple pigments include anthraquinone violet, dioxazine violet, and methyl violet. , The blue pigment and the violet pigment are blended in a total amount of 0.0001 to 0.04 parts by weight with respect to 100 parts by weight of the base rubber, but in a total amount of 0.001 to 0.03 parts by weight and blue. Weight ratio of the system pigment / purple pigment is 15/85 to 65
It is preferable to mix at a ratio of / 35.

In the present invention, in addition to the above components, for example, an antioxidant, a higher fatty acid and the like can be appropriately blended. In particular, 2,6-di-t-butyl-4-methylphenol is used as an antioxidant in an amount of 0.1 to 100 parts by weight of the base rubber.
It is preferable to add 1 to 2 parts by weight.

[0011] The one-piece solid golf ball of the present invention has a clear composition containing an antioxidant and / or a light stabilizer in the main body of the ball obtained by pressing and heating the rubber composition and then polishing the rubber composition. Manufactured by painting only paint. As the clear coating, urethane resin, acrylic resin or the like is used as a base resin, and an antioxidant and / or
Or 1 or 2 times using a substance containing a light stabilizer
Paint more than once. As antioxidants and light stabilizers,
Although various things are used, a hindered phenol type antioxidant, a phosphite type antioxidant, a hindered amine light stabilizer, etc. are illustrated, and arbitrary one type or two or more types are used. In particular, hindered phenolic antioxidants are preferred, and pentaerythrityl-tetrakis [3-
(3,5-di-t-butyl-4-hydroxyphenyl)
Propionate], N, N'-hexamethylenebis (3,5-di-t-butyl-4-hydroxy-cinnamamide) and the like. The content of the antioxidant and / or the light stabilizer in the clear paint is determined based on the solid content of the paint.
It is preferably 0.1 to 10 parts by weight with respect to 0 parts by weight.

In the present invention, in addition to the antioxidant and / or the light stabilizer, for example, an ultraviolet absorber, a fluorescent whitening agent and the like can be appropriately added to the clear paint.

[0013]

Next, the present invention will be described with reference to Examples 1 to 16 and Comparative Examples 1 to 6.

In Examples 1 to 16 and Comparative Examples 1 to 6,
As shown in [Table 1], the clear paint shown in [Table 2] and [Table 3] is applied to the surface of the ball body mainly including the base rubber made of cis-1,4-polybutadiene. Thus, a one-piece solid golf ball was prepared, and its durability, appearance, and adhesion of the clear paint to the ball body were evaluated. In this case, "durability"
Is indicated by an index when the durability of a conventional one-piece solid golf ball is set to 100, and the “appearance” is evaluated by measurement and visual judgment using a color difference meter (manufactured by Minolta Camera Co., Ltd.). The "adhesion" was evaluated by hitting a ball left for one month under natural light (sunlight) 100 times and then performing a cross-cut peel test. ◎ indicates extremely good, は indicates good, △ indicates normal, and × indicates bad.

With respect to the durability, there is hardly any difference from the conventional one-piece solid golf ball or between the example and the comparative example.

With regard to the appearance, the titanium oxide having the smallest amount of titanium oxide of 1 part by weight was used. Comparative Example 3 using the ball body of No. 9
And No. 0 in which the blending amount of the blue pigment / purple pigment is 0. 11
Comparative Example 5 using the ball body portion of No. 5 and the No. 3 sample having the largest blending amount of the blue pigment / purple pigment of 0.05 part by weight. 12
Comparative Example 6 using the ball body of Example 1 was poor, and good results were obtained for the other Examples and Comparative Examples. In addition, the titanium oxide containing 12 parts by weight of titanium oxide was the most. 3
Very good results were obtained also in Example 4 using the above-mentioned ball body. Further, No. 1 containing 0.0001 of a blue pigment / purple pigment was blended. No. 4 blended with Example 5 using the ball body of No. 4 and 0.04 part by weight of No. 4. Very good results were obtained also with Example 6 using the ball body of No. 5. Therefore, the blending amount of titanium oxide is 2 to 12 parts by weight based on 100 parts by weight of the base rubber, and the blending amount of the blue pigment / violet pigment is 0.1 to 100 parts by weight of the base rubber. Good results are obtained with 0001 to 0.04 parts by weight.

The adhesion between the ball body and the clear paint was poor in Comparative Examples 1 and 2 in which an antioxidant and / or a light stabilizer was not added to the clear paint, and other Examples and Comparative Examples Good results were obtained for the examples. Therefore, it is understood that the antioxidant and / or the light stabilizer contribute to improving the adhesion.

[0018]

[Table 1]

[0019]

[Table 2]

[0020]

[Table 3]

[0021]

According to the one-piece solid golf ball of the present invention, the ball body can be made bright white by blending titanium oxide, a blue pigment and a violet pigment with the base rubber. Since the clear paint is directly applied to the ball body, not only can the appearance be sufficiently whitened, but also the manufacturing process can be facilitated by omitting the step of applying the white paint.
In addition, by adding an antioxidant and / or a light stabilizer to the clear paint, the adhesion between the ball body and the clear paint layer can be improved, and the quality can be maintained for a long time.

Continuation of the front page (56) References JP-A-3-133471 (JP, A) JP-A-63-311970 (JP, A) JP-A-61-119283 (JP, A) JP-A 64-70086 (JP) JP-A-53-47444 (JP, A) JP-A-60-60866 (JP, A) JP-B-63-41589 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB Name) A63B 37/00-37/14

Claims (4)

(57) [Claims] 1. A one-piece solid golf ball wherein the main body of the ball comprises a composition comprising a base rubber, an α, β-unsaturated carboxylic acid and / or a metal salt thereof, an organic peroxide, and a filler. The composition contains 2 to 12 parts by weight of titanium oxide based on 100 parts by weight of the base rubber, and 0.0001 to 0.04 parts by weight of the blue pigment and the violet pigment based on 100 parts by weight of the base rubber. A one-piece solid golf ball, wherein a clear paint containing an antioxidant and / or a light stabilizer is applied to the main body of the ball. 2. The one-piece solid golf ball according to claim 1, wherein the base rubber has a cis 1,4 bond of 40%.
A one-piece solid golf ball characterized by being a polybutadiene rubber containing the above. 3. A one-piece solid golf ball according to claim 1, wherein 2,6-di-t-butyl-4-methylphenol is added to the composition as an antioxidant, based on 100 parts by weight of the base rubber. A one-piece solid golf ball comprising 0.1 to 2 parts by weight. 4. The one-piece solid golf ball according to claim 3, wherein the clear paint contains a hindered phenolic antioxidant.