JPS6088567A - Golf ball - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a novel golf ball exhibiting the following properties.

Recently, golf balls with colored surfaces, called colored balls, have been proposed, but with balls that only have a colored paint layer on the cover surface, if a cut occurs, there will be no color between the cut surface and other parts. As a result, damage to the ball becomes very noticeable, and even if the ball can be used satisfactorily in terms of performance, it is psychologically difficult to continue using it. Moreover, since it is simply colored for coloring, it does not bring out the beauty beyond the coloring.

The present invention was made in view of such circumstances,
By covering the white core with a cover that uses only fluorescent pigments or fluorescent dyes as a coloring agent, it is bright and beautiful like crystal glass, and even if a cut occurs, the cut surface and other parts will not overlap. To provide a golf ball in which no difference in color occurs between the golf balls.

The fluorescent pigments and fluorescent dyes used in the present invention are already commercially available in various colors such as orange, yellow, pink, red, green, purple, and blue. However, to give specific examples of them by product name, for example, orange-based products include Z-15 and Z-' manufactured by Day Glo.
16. Nippon Shokubai Chemical Co., Ltd.! ! I's F P-11
4, F P-115, etc., and yellowish ones include Z-17 manufactured by Day-Glo and Nippon Shokubai Chemical Co., Ltd.
Examples include FP-116 and FP-117 manufactured by Co., Ltd., and pink ones include Z-11 manufactured by Day-Glo and FP-112 manufactured by Nippon Shokubai Kagaku Kogyo Co., Ltd.

The amount of these fluorescent pigments and fluorescent dyes needs to be blended in an amount that does not lose the transparency of the cover and can color the cover beautifully, and the optimum amount depends on the fluorescent color used. Although it varies depending on the brand and color of the pigment and fluorescent dye, it is usually 0.5 to 3.0% by weight in the cover composition.
It is preferable that

As the main material constituting the cover, resins such as ionomer resins, polyurethane, and polyacetal can be used, and ionomer resins are particularly preferred because they have high transparency and excellent cut resistance.

The cover composition is prepared by blending the above-mentioned fluorescent pigment or fluorescent dye with a resin as a main material such as an ionomer resin, and if necessary, blending a small amount of metal soap to improve dispersibility. ! be done.

As for the core, either a solid core or a thread-wound core can be used, but it is desired that it be white, so that the light that passes through the cover is reflected by the core, and the ball itself shines brightly, as if it were made of crystal glass. It now has a beautiful appearance.

In order to enhance the beauty mentioned above, the larger the white melon core, the better. To adjust the whiteness of the core, titanium dioxide is used; in the case of a solid core, it is sufficient to mix 1 part or more of titanium dioxide to 100 parts (parts by weight, the same applies hereinafter) of the base rubber for the core; In the case of the core, at least 1 part of titanium dioxide may be mixed with 100 parts of the base rubber of the thread rubber. However, in the case of thread-wound cores, as the amount of titanium dioxide in the rubber thread increases, the physical properties deteriorate, so it is desirable to keep the amount of titanium dioxide at 10 parts or less based on 100 parts of the base rubber.

Examples of suitable core compositions when using a solid core in the present invention include, for example, 100 parts of cis-1,4-polybutadiene rubber, 10 to 50 parts of a metal salt of an unsaturated carboxylic acid such as acrylic acid or methacrylic acid. 15 to 35 parts or acrylic ester or methacrylic ester
parts, 10 to 60 parts of zinc oxide, 1 to 20 parts of titanium dioxide, and 0.5 to 5 parts of peroxide such as dicumyl peroxide.
Examples include compositions consisting of parts. Further, when a thread-wound core is used, a composition for rubber thread may be prepared by blending titanium dioxide with a conventionally used composition for rubber thread as described above.

The ball is made by covering a solid core obtained by vulcanizing a core composition or a thread-wound core obtained by winding a rubber thread around the center with a cover made of the composition described above, and if necessary, applying a cover to the surface of the cover. Obtained by applying clear lacquer or paint.

The method of coating the core with the cover is not particularly limited, but
Usually, a method is employed in which the core is wrapped in two covers previously formed into hemispherical shell shapes and pressure molded at 150 to 170° C. for 1 to 15 minutes. Alternatively, the cover composition may be injection molded to enclose the core.

The thickness of the cover must be such that the light that hits the ball passes through the cover and is reflected by the core inside the ball, making the cover look beautiful, and at the same time maintains sufficient strength as a cover for the ball. From this point of view, the thickness of the cover is 1
．． Approximately 0 to 2.5 +nn+ is preferable.

The paint or clear lacquer applied to the ball cover surface is preferably polyurethane-based. The same fluorescent pigment or fluorescent dye as the cover can be used as a coloring agent in the paint, but in this case, it is preferable that the paint has a similar color.

The golf ball of the present invention obtained as described above has a bright, crystal-like beauty, but is basically obtained by incorporating a fluorescent pigment or fluorescent dye into the cover. - There is no significant deterioration in the ball's physical properties, and the distance, durability, and feel are the same as conventional golf balls on the market.

Next, the present invention will be explained with reference to Examples.

Examples 1-2 and Comparative Example 1 Three types of two-piece solid golf balls were manufactured using the formulations shown in Table 1. The amount of each component is based on parts by weight. The same applies below.

Table 1 (Note) *1 Surlyn 1707 manufactured by Du Pont *2 Orange fluorescent pigment balls manufactured by Day Glo were manufactured as follows.

The core composition shown in Table 1 was heated to 30°C at 150°C in a mold.
A solid core having a diameter of 37 mm was obtained by vulcanization (heat-pressing molding) for a minute.

On the other hand, the cover composition shown in Table 1 was molded into a hemispherical shell shape, the solid core was wrapped with the hemispherical shell-like cover of 2 (11i1), and the solid core was pressure-molded in mold 1 at 70°C for 2 minutes to give a diameter of 41 mm. , a 2 mm two-piece golf ball was manufactured.

The resulting ball was finished by applying a polyurethane clear lacquer.

Example 1 and Example 2 completed as above
In this ball, the light transmitted through the cover is reflected by the core and the ball itself shines, giving it an extremely bright and crystal glass-like appearance, which is much more beautiful than the ball of Comparative Example 1, which is a commercially available product. there were.

Examples 3 to 4 and Comparative Example 2 A rubber composition having the composition shown in Table 2 was vulcanized onto a center having a diameter of 29 mm obtained by vulcanizing a rubber composition having polybutadiene rubber as the base rubber. The rubber thread obtained by
A thread-wound golf ball having a diameter of 40n+m was obtained by pressure molding at 0°C for 2 minutes. The thickness of the naori bar was 1.5 mm.

Table 2 (Note) *1 Manufactured by Yoshitomi Pharmaceutical Co., Ltd., 425 *2 Manufactured by Iriuchi Shinko Kagaku Co., Ltd., Tsukusela 8 *3 Manufactured by DuPont Co., Ltd. Zarin 1601 The resulting ball was finished by applying a polyurethane clear lacquer. Ta.

Example 3 and Example 4 completed as above
In Comparative Example 2, which is a commercially available thread-wound golf ball, the ball itself shines as light transmitted through the cover is reflected by the core, giving it a very bright, crystal glass-like appearance.
It was much more beautiful than the ball.

Claims (4)

[Claims] (1) A golf ball characterized in that a white core is covered with a cover using only a fluorescent pigment or fluorescent dye as a coloring agent. (2) Claim 1, in which an ionomer resin is used as the main material of the cover, and 0.5 to 3.0% by weight of a fluorescent pigment or fluorescent dye as a coloring agent is blended in the cover composition. golf ball. (3) The golf ball according to claim 1 or 2, wherein the cover has a thickness of 1.0 to 2.5 m+w. (4) The golf ball according to claim 1, 2, or 3, wherein a clear lacquer is applied to the cover surface.