JPS5991973A - 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 two-piece solid golf balls.

Conventionally, so-called thread-wound golf balls have been the mainstream and are characterized by excellent repulsion properties and good feel when hit, but the disadvantages are that the manufacturing process is complicated and expensive, and that they are inferior in durability. It becomes. In order to improve the high cost and durability, a so-called two-piece solid golf ball has been developed, which has a solid core integrally molded with a highly repulsive elastic body and has a coating layer with excellent cut resistance on its outer periphery.

Although the solid balls that have been developed to date have fulfilled their purpose, there is a strong desire to develop a golf ball that has even improved durability, rebound properties, and good feel when hit.

Therefore, the present inventors conducted studies to obtain a two-piece solid golf ball that has excellent rebound properties comparable to those of thread-wound golf balls, and has extremely good durability and feel when hit, and as a result, the present invention was completed.

That is, the gist of the present invention is to provide a rubber composition with a diameter of 36 to 38 cm, which is made of a rubber composition or resin composition containing 5 wt % or more of at least one type of carbon fiber, silicon carbide fiber, or boron fiber with a length of 0.1 + m + 1 or more. A two-piece solid golf ball characterized in that a coating layer of 1.6 to 2.2 mm thick made of rubber or resin having a Shore hardness of 60 to 80 is provided around the outer periphery of a spherical solid core.

The golf ball of the present invention is made of a rubber composition or a resin composition containing 5 wt% or more, particularly 10 to 70 wt%, of at least one of carbon fiber, silicon carbide fiber, or boron fiber having a solid core length of 0.1 mm or more. It has a major feature in its structure. The fiber length used for this N is 0.1+mn
If any of the above-mentioned materials are used, and short fibers are used, the solid core portion can be easily molded by injection molding or the like. On the other hand, when long fibers are used, they can be wound into a thread to form a solid core.

Also, the weight of a golf ball is 45 according to J, G, and A standards.
．． Therefore, the solid golf ball of the present invention also has a self-weight of 44.5 to 44. Zinc oxide, barium sulfate, calcium carbonate, silica, and titanium dioxide are added to the solid core as fillers as necessary to maintain the range.

It is preferable to add 40 to 80 parts by weight of the rubber or resin to 100 parts by weight of the rubber or resin.

In addition, the above fillers may act as crosslinking agents depending on the rubber components and resin type used, and by creating a crosslinked structure in the solid core, it is possible to reduce the amount of filler used and increase repulsive force. . Further, when using a resin, the above object can be achieved by using a crosslinking agent such as an acid or an amine.

In the present invention, the solid core composition obtained by blending the above components is kneaded using a general mixer, such as a Banbury mixer or a roll, and then compressed into a core mold or molded into a solid core by injection molding. . When the matrix of this composition is rubber or thermosetting resin, it is heated and cured to form a solid core at a temperature necessary for crosslinking and curing.

The coating layer covering the solid core is mainly made of rubber or resin, and if necessary, an inorganic filler such as titanium dioxide, zinc oxide, barium sulfate, etc. may be added for the purpose of coloring. The Shore hardness of the coating layer is 60-80.

The thickness of the coating layer is 1.5 due to the diameter of the solid core.
~3.0 snow. The thickness of the coating layer is 1.5 to 3.0fi.
By doing so, the initial velocity of the ball obtained by the present invention is significantly improved.

The method of forming the coating layer on the solid core is usually to wrap the solid core with two hemispherical covers and apply a coating layer of 150 to 2
Pressure mold at 00°C for 2 to 3 minutes. Alternatively, the cover composition may be injection molded to cover the solid core.

The two-piece solid golf ball obtained as described above is a golf ball that has improved repulsion (initial velocity), durability, and feel when hit compared to conventionally developed products of the same type.

The present invention will be explained below with reference to Examples.

Example 1 Six types of two-piece solid golf balls were manufactured according to the formulations shown in Table 1. Tagshi ball E1F is a conventional product for comparison.

1) Manufactured by Japan Synthetic Rubber 2) Manufactured by DuPont Co. Add carbon fiber to rubber or resin, knead using a kneading roll, and press mold or injection mold using a mold to produce a spherical solid core with a diameter of 380 cm.

On the other hand, a cover made of ionomer resin mixed with titanium dioxide (thickness 2.0 mm) is wrapped in a hemispherical shell-like cover with a diameter of approximately 17 mm.
A two-piece solid golf ball having a diameter of 41.2 mm is produced by pressure molding at 0° C. for 2 minutes.

The physical properties of the obtained two-piece solid golf ball were determined, including the diameter and weight of the solid core.

are shown in Table 2 along with the thickness of the coating layer.

Table-2 1) Using a golf ball hitting tester, test the ball with Wood 1
Initial velocity when hitting with a club at a speed of about 40 m/sec.

2) Compare with commercially available products.

Example 2 Two types of two-piece solid golf balls were manufactured in the same manner as in Example (1) except that the solid core composition and (2) thermosetting epoxy resin and polyester resin were used and molded together with BMC.

Table 3 Table 4 Patent applicant Patent attorney representing Mitsubishi Rayon Co., Ltd. 1) Taketoshi Mura Procedural amendment (method) March 8, 1980 Commissioner of the Patent Office Kazuo Wakasugi 1, Indication of the case 1982 Patent Application No. 204119 3, Relationship with the amended case Patent applicant: 2-3-19 Kyobashi, Chuo-ku, Tokyo (603) Osamu Kanazawa, President and Director of Mitsubishi Rayon Co., Ltd., Agent: Tokyo 2-8-1 Toranomon, Minato-ku Sent on February 22, 1982 6, Specification subject to amendment 7, Cleaned copy of the amended statement of contents (no change in content) Table 1 1) Made by Japan Synthetic Rubber 2) Carbon fiber is added to DuPont rubber or resin, kneaded using a mixed wire roll, and then pressure-molded or injection-molded using a mold. Hit Zoll at about 40m/sec using Wood No. 1 club.

Initial velocity dust when hitting at high speed.

2) Compare with commercially available products.

Example 2 Two types of two-piece solid golf soles were manufactured in the same manner as in (8) Jijitsu (Incorporated Foundation) except for molding as BMC using the solid core composition and (2) thermosetting epoxy resin and polyester resin. did.

Table-3 (9) Table-4 Patent applicant: Mitsubishi Rayon Co., Ltd. Agent Patent Attorney 1) Takeshi Mura (10) 3971

Claims (1)

[Claims] (1) Carbon fibers, silicon carbide fibers with a length of 0.1 cm or more,
Or, the outer periphery of a spherical solid core made of rubber or resin with a diameter of 36.0 to 38wn, containing a small amount of boron fiber (at least 5 wt% of one type), and a thickness of 1.6 mm mainly made of rubber or resin with a Schomer hardness of 60 to 80. A two-piece solid golf ball characterized by being provided with a 2.2-tone coating.