JP2712995B2 - 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 golf ball capable of effectively reducing impact vibration caused by hitting of a golf club and obtaining a soft feeling.

[0002]

2. Description of the Related Art In recent years, golf balls include a core material in which a rubber cord is wound around a rubber sphere called a wound ball while applying tension, and a golf ball using natural rubber (balata) as a surface coating material. In addition, flight distance, wear resistance,
For the purpose of improving durability and resilience, a ball called a two-piece ball using a synthetic resin for a core and a surface coating material has also been established in the market. In the wound ball, since the specific gravity of the sphere at the center of the core is higher than the specific gravity of the rubber thread, the specific gravity around the center is smaller than that at the center. On the other hand, in the case of a two-piece ball, since the density of the entire ball is substantially uniform, the moment of inertia is larger than that of a wound ball, thereby contributing to an improvement in flight distance. Further, since a synthetic resin harder than natural rubber is used, abrasion resistance is good. On the other hand, some wound balls have a core wound with a conventional wound core, and the synthetic resin is applied to the surface coating material to improve durability and resilience.

[0003]

However, in the case of such a ball using a synthetic resin as a surface covering material, it is feared that the golf ball has a hard hitting feeling when hit with a golf club, and that the touch during putting is particularly bad. Was.

An object of the present invention is to provide a ball using a synthetic resin as a surface coating material, without impairing its characteristic flight distance, abrasion resistance, and durability, without impact vibration transmitted to a hand, which has been regarded as a defect. An object of the present invention is to provide a golf ball capable of reducing the soft feeling.

[0005]

The present invention employs the following means to achieve the above object.

That is, the golf ball of the present invention has a surface
In golf off ball comprising a coating material and a core, said surface
At least a portion selected from dressing and core, the vibration suppressing material vibration loss coefficient at room temperature is 0.01 or more
Characterized in that a layer consisting of

[0007]

According to the present invention, when a vibration damping material having a vibration damping ability made of a specific resin composition is used for a part of a golf ball, for example, at least a part of a surface coating material or a core material,
Surprisingly, it has been found that the feel and response when hit with a golf club are extremely soft, unlike the hit feeling at all.

That is, the present inventors have prepared a golf ball in which a part of the surface covering material of a core resin is coated with the vibration suppressing material, and the surface thereof is further covered with a synthetic resin.
When the golf ball was hit with a putter, a golf ball with a soft feel and a shot feeling was accidentally obtained. This feeling was even softer than the feeling of a wound ball whose surface coating resin was made of natural rubber (balata).

[0009] The vibration suppressing material referred to in the present invention is a US military standard MI.
Those having a vibration loss coefficient of 0.01 or more, preferably 0.02 or more, which is a value measured according to LP-22581B, are used. The effect of the present invention cannot be obtained even if a vibration suppressing material that does not satisfy such a vibration loss coefficient is used. Vibration loss
The method of calculating the loss factor is disclosed in Japanese Patent Publication No. 62-1988.
As shown, a 16 mm thick vibration damping material is
mm two-part epoxy adhesive
After standing for 24 hours to cure the adhesive, US military standards
Measure the vibration damping waveform according to MIL-P-22581B.
And the vibration loss coefficient (η) is determined by the following equation. a. Attenuation rate D0 (dB / sec) = (F / N) 20 _log (A1 / A
2) b. Effective attenuation rate De (dB / sec) = D0-DB c. Limit damping rate C / Cc (%) = (183 × De) / F d. Vibration loss coefficient η = (C / Cc) / 50 where F: natural frequency of the disk itself to which the sample is adhered N: number of calculated periods A1: maximum amplitude A2 in N : 〃 minimum amplitude D0 : Attenuation rate of the disk itself to which the sample is bonded, DB: Original disk (disk with vibration damping material attached)
Attenuation rate

[0010] The specific gravity of the vibration suppressing material is preferably in the range of 1.5 to 5.0 g / cm ³ , and is higher than the resin constituting the other parts of the golf ball. Therefore, the golf ball of the present invention is characterized in that the magnitude of the moment of inertia that determines the amount of rolling of the ball can be freely controlled by the lamination position of the vibration suppressing material.

For example, if the specific gravity of the core portion of the golf ball of the present invention is increased, a golf ball having a feeling that is much softer than a wound ball can be obtained even if the amount of rolling is the same as that of the wound ball. In addition, when the specific gravity of the core material surface layer of the golf ball is higher than the center of the golf ball, the moment of inertia is larger than that of the two-piece ball, so that the rolling can be made larger than the two-piece ball, and a soft feeling can be obtained. . When the moment of inertia is increased,
The backspin amount at the time of hitting the ball is reduced, the resistance against wind and the like is increased, and the directional stability is improved.

The vibration-suppressing material used herein has a compression elasticity similar to that of the surface-coating material without loss of repulsion energy, and is a resin other than the vibration-suppressing material and the surface-coating material and the core material. It is important that the value of the vibration loss coefficient of the vibration suppressing material is larger than the above vibration loss coefficient. Therefore, in the present invention, in order to fulfill such a function, a resin composition in which an inorganic filler is blended with a synthetic resin is used.

As a synthetic resin constituting such a vibration suppressing material, any of a thermoplastic resin and a thermosetting resin can be applied, but a thermosetting resin which is easily mixed with an inorganic filler is preferably used.

Examples of the thermoplastic resin include polyamide resin, polyester resin, polycarbonate resin, ABS resin, polyvinyl chloride resin, polyacetal resin, polyacetal resin, polyacrylate resin, polystyrene resin, Polyethylene-based resins, polyvinyl acetate-based resins, polyimide-based resins, and the like, and mixed resins thereof can be used.

As the thermosetting resin, epoxy resin, unsaturated polyester resin, phenol resin,
Melamine-based resins, diallyl phthalate-based resins, urethane-based resins, polyimide-based resins, and the like, and mixed resins thereof can be used.

As the inorganic filler mixed with such a resin, graphite, ferrite, mica and the like are preferably employed. The weight ratio of such an inorganic filler is preferably 10 to
70%, more preferably in the range of 20-60%. If the amount of the inorganic filler is less than 10%, a sufficient damping effect cannot be obtained,
If it is more than 70%, the strength and elongation of the vibration suppressing material will be low,
It becomes easy to peel off from the synthetic resin layer constituting the surface coating material due to repeated fatigue or the like. However, the higher the ratio of the inorganic filler to the synthetic resin, the higher the specific gravity, and it is possible to provide a vibration suppressing material in which the moment of inertia can be easily controlled.

The vibration-suppressing material of the present invention is used by being laminated on at least a part of an inner layer of a golf ball, for example, a synthetic resin layer which is a main component of a surface covering material, or by being used on at least a part of a core portion. This constitutes the golf ball of the present invention. For example, the vibration suppressing material layer in the cross section of the golf ball structure may be laminated on at least one of the cross sections of the structure composed of the synthetic resin layer, but may be laminated in multiple layers.

In general, among wound golf balls, thread-wound balls use natural rubber (balata), ionomers, polyester elastomers and the like as a surface covering material.
Usually, polyisoprene rubber is used as the thread rubber, and polybutadiene rubber is used as the core. The two-piece ball has a structure in which a core occupying most of the ball is covered with a surface covering material of the same material as described above. In this case, an ionomer, a polyester elastomer, or the like is used for the core. You.

The present invention constitutes such a golf ball .
At least a portion selected from the surface coating material and the core,
Ie, at least part of or rubber thread portion of the inner layer of the surface coating material, such as even at least a portion of the core portion, provided with a layer consisting of vibration suppressing material on at least a portion of these various parts Things.

The golf ball of the present invention will be further described with reference to the drawings.

FIG. 1 is a sectional view of an example in which a vibration-suppressing material layer 1 is continuously laminated over a full length between a synthetic resin layer 2 constituting a surface covering material and a synthetic resin layer 3 constituting a core. FIG. 2 shows an example in which the vibration suppressor 1 is partially laminated on the surface of the synthetic resin layer 3 constituting the core. FIG. 3 shows an example in which the vibration suppressing member 1 is disposed on the core. However, these drawings show typical structural examples, and the golf ball of the present invention is not limited to these structures.

[0022]

Next, the present invention will be described in more detail with reference to the drawings.

Example 1, Comparative Examples 1-3 As an example, a golf ball having the structure shown in FIG. 1 was prepared. That is, a synthetic resin surface covering material 2 having a Shore hardness (D) of 55
Then, a surface of a synthetic resin 3 as a material constituting a core is coated with a vibration-suppressing material 1 having a composition shown below in a thickness of 0.5 mm, and is composed of a surface covering material 2, the vibration-suppressing material 1 and the synthetic resin 3. A golf ball was produced by combining the cores. In order to adjust the ball weight to 1.62 oz (45.926 g) or less, the core resin was foamed with resin to reduce the apparent density.

(Resin Composition of Vibration Suppressing Material 1) Epoxy resin 12.3 parts (Yukaka Shell Co., Ltd .: Epicoat-815) Polyamide resin 24.6 parts (Henkel Hakusui Co., Ltd .: Versamide-125) Ter 8.1 parts Ferrite 55.0 parts The specific gravity of this vibration suppressing material was 1.86, and the vibration loss coefficient at 20 ° C. was 0.04.

As Comparative Example 1, "ROYA" manufactured by Sumitomo Rubber Co., Ltd. was used as a wound ball using natural rubber as a surface coating material.
A black label of L MAXFLY "was used.

As Comparative Example 2, a black label "MAXFLY DDH" manufactured by Sumitomo Rubber Co., Ltd. was used as a wound ball using a synthetic resin as a surface covering material.

Further, as a comparative example 3, a "Top Flight 49" manufactured by Spalding Co., Ltd. was used as a two-piece ball.
2 "was used.

As a result, in the first embodiment, the resonance frequency 1
At 2.1 Hz, the vibration loss coefficient was 1.2. In Comparative Example 1, the vibration loss coefficient was 0.11 at the resonance frequency of 9.4 Hz. In Comparative Example 2, the resonance frequency was 9.5 Hz.
In Example 1, the vibration loss coefficient was 0.08. In Comparative Example 3, the vibration loss coefficient was 0.0 at a resonance frequency of 14.1 Hz.
45.

Example 2 A golf ball was produced in the same manner as in Example 1 except for the composition of the vibration suppressing material shown below.

(Resin Composition of Vibration Suppressing Material 2) Polyester Elastomer 50.0 parts (manufactured by Du Pont-Toray Co., Ltd .: Hytrel HTR8122) Ferrite 50.0 parts The specific gravity of the vibration suppressing material is 1.83 and at 20 ° C. The vibration loss coefficient was 0.05.

As a result, in the second embodiment, the resonance frequency 1
At 2.5 Hz, the vibration loss coefficient was 1.3.

As a test hit test of the prototype ball and the ball used as a comparative example, ten people hit each with a putter, and the balls of Example 1 and Example had almost the same feeling of hitting. The result that the impact feeling was the least and the impact feeling became stronger in the order of Comparative Example 1, Comparative Example 2, and Comparative Example 3 was obtained.

[0033]

According to the present invention, it is possible to provide a golf ball having a function of effectively reducing impact vibration when hit with a golf club.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an example in which a vibration suppressing material layer 1 is continuously laminated over a full length between a resin layer 2 forming a surface covering material and a resin layer 3 forming a core material.

FIG. 2 is an example in which a vibration suppressing material 1 is partially laminated on a surface layer of a resin layer 2 forming a surface covering material and a resin layer 3 forming a core material.

FIG. 3 is an example in which a vibration suppressing member 1 is arranged at the center of a core resin layer constituting a golf ball.

[Explanation of symbols]

 1: Vibration suppressing material 2: Synthetic resin layer forming surface coating material 3: Synthetic resin layer forming core material

Claims (4)

(57) [Claims] 1. A surface covering material and golf full baud <br/> Le comprising a core, a portion also least <br/> rather selected from the surface dressing and the core portion, the vibration loss at room temperature A golf ball provided with a layer made of a vibration suppressing material having a coefficient of 0.01 or more. 2. The vibration suppressing material has a specific gravity of 1.5 to 5.0 g.
2. The golf ball according to claim 1, wherein the ratio is in the range of / cm ³ . 3. The golf ball according to claim 1, wherein the vibration suppressing material is a resin composition comprising a synthetic resin and an inorganic filler. 4. The golf ball according to claim 3, wherein the synthetic resin is a resin selected from thermoplastic resins.