JPS6092780A - Golf ball for exercise field - 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 driving range golf ball, and more particularly to a driving range golf ball having extremely high durability and low repulsion.

Golf balls are generally classified into two types depending on their use. One type is a round ball normally used on golf courses C, and the other type is a driving range golf ball used at a driving range.

Although the above two types of golf balls are said to have the same properties, they are far from the same. In other words, the performances required of a round golf ball include good feel at impact, excellent flight distance or elongation, and a certain degree of durability.

However, when these round golf balls are used at the driving range, the durability of driving range golf balls, which are used over and over again, is extremely poor, and although they have a good feel at impact, they cannot be used for long distances. is too large to be used as a practice field. In general, golf practice ranges, especially in Japan, are often very narrow, with some exceptions.
The worst part is where the no yield is less than 100m. At a practice range like this, the first thing you need to do is set a high net.
The hit ball hits this net 1 ~, and balls with a long distance Ml, such as balls with high initial velocity, are
It quickly damages the net, shortens its lifespan, and often makes practice field management difficult. Furthermore, even in a large practice field, it is impossible to cover the entire area with netting due to cost considerations. Therefore, the ball that is hit often goes over the net.1 However, it is very dangerous for the ball to go over the net in this way at a practice field that is adjacent to a private house or other facility, as in Japan. It is. Therefore, it is important for driving range golf balls to have a certain range of flight distance depending on their size and the height of the net.

Golf balls for driving ranges that are currently in general use are one-piece golf balls that are easy to manufacture and inexpensive, and are made of high-cis polybutadiene as a main component.

In this case, if methacrylic acid or acrylic acid was neutralized with zinc oxide as shown in Japanese Patent Publication No. 55-19615 and graph 1~ was made as it is, the repulsion would be too high for the practice range, and it would be necessary to shoot hundreds of times. As a driving range golf ball, it is extremely difficult to maintain durability. Also, Mr. Burge 1's patent (U.S. Patent No. 3,313,545)
Ester blend products such as those found in the above have not only poor durability but also a very poor feel at impact, and although their flight distance is not great, they have extremely poor other physical properties and have not been used in recent years. Therefore, there is currently a desire to develop a golf ball that can be used for training to replace these balls.

The present invention provides a golf ball for driving ranges that has a reduced flight distance and extremely improved durability while maintaining good performance, shot feel, ball trajectory, etc. generally required of a golf ball.

In other words, the present invention requires 3 to 35 parts by weight of low repulsion rubber, 20 to 30 parts by weight of methacrylic acid, and 20 to 50 parts by weight of a metal compound capable of forming a metal salt to methacrylic acid per 100 parts by weight of the base rubber. Driving range golf balls and low repulsion rubbers 3 to 35 obtained by vulcanizing compositions containing 44
Metal compound 2 forming metal salt of methacrylic acid with heavy stone part
After forming a masterbatch with 0 to 50 parts by weight, it is blended with 100 parts by weight of profiteering rubber and at the same time 20 parts by weight of methacrylic acid.
Provided is a method for producing a golf ball for a driving range, which comprises adding 30 parts by weight of the compound to form a composition having the formula shown in graph 1 and then vulcanizing the composition.

Examples of the base rubber used in the present invention include c.
Examples include polybutadiene rubber containing is-1,4 bonds. Preferably cis-1.

1 to 10 parts by weight of polybutadiene rubber having 40 or less cis-1,4 bonds is contained in 100 parts by weight of polybutadiene rubber containing 95% or more of 4 bonds.

Examples of the rubber used in the present invention that has low repulsion properties include butyl rubber, chlorinated butyl rubber, and the like. The low repulsion characteristic rubber is 3 to 35% per 100 parts by weight of the base rubber! f
It is preferable that 1 part of f is contained.

If the content is 3% by weight or less, a decrease in flight distance is not desired, and if the content is 35 parts by weight or more, the ball hardness becomes soft and the shot feel becomes poor.

Examples of metal compounds used in the present invention include metal salts of methacrylic acid. Preferred metal salts of methacrylic acid include calcium salts, magnesium salts, zinc salts, aluminum salts, tin salts, and the like. Preferred is the methacrylic acid salt 1). Therefore, 4F lead oxide is particularly preferred as the metal compound. The metal compound is preferably contained in an amount of 20 to 500 to 50 parts by weight per 100 parts by weight of the base rubber. If it is less than 20 parts by weight, the impact resistance will not be sufficient, and if it exceeds 50 parts by weight, the hardness of the golf ball will be too high.

The driving range golf ball of the present invention is obtained by vulcanizing a composition containing the above-mentioned substances. , even if an inert filler is mixed in. Thiobisphenol-based anti-aging agents are preferred, such as 4,4'-thiobis (6-thi-11-3-butylphenol), etc. Preferably, the anti-aging agent is usually contained in an amount of 0.1 to 1.0 parts by weight.

As a free radical initiator, dicumylpar 711-1t
-butylperoxybenzoe-1-11-1 dercumyl peroxide, etc., and dicumyl peroxide is particularly preferred. The amount of free radical initiator added is not particularly limited, but is usually 0.5 to 3 per 100 suspended parts of the base rubber.
．． When used in a range of 0 parts by weight, a driving range golf ball with excellent hardness can be obtained. The inert fillers contained in the composition of the present invention include barium 6A acid, zinc oxide, calcium oxide,
Examples include zinc carbonate and silica. , preferably calcium carbonate. The inert filler is preferably blended in an amount of 3 to 20 parts per 100 parts of the base rubber.

If desired, other conventional additives may be added to the composition used to manufacture the golf ball for driving ranges of the present invention.

The golf ball of the present invention can be obtained by vulcanizing the above composition by a conventional method. The vulcanization temperature may be within any conventional range, but from a manufacturing standpoint, it is 160°C, which is conventionally common.
It is preferable to vulcanize at a temperature of 1,170 to 180°C, which is higher than the vulcanization temperature of 1,170 to 180°C.

φ The driving range golf ball of the present invention is produced by making a masterbatch of low repulsion special 11 rubber and zinc oxide in advance, and then performing polymer blending with polybutadiene and base rubber, and adding especially methacrylic acid to create a master batch of low repulsion special 11 rubber and zinc oxide. It is preferable to In general, it is often thought that it is easy to infer that when special low-repulsion rubber is blended with high-repulsion rubber, the repulsion ('1-) will change, but in reality, this is done with ordinary polymer blends. If this occurs, the ball may adhere to the roll, deteriorate extrusion characteristics, deteriorate mold releasability, etc. Furthermore, the ball a) becomes soft in hardness and has a poor shot feel, making it unsuitable for practical use.

The present invention solves the above-mentioned manufacturing difficulties and poor performance of the resulting ball by preparing a masterbatch of butyl rubber and zinc oxide and then blending the base rubber.

The driving range golf ball of the present invention has performance comparable to that of a round golf ball in terms of shot feel, pitch, etc., is extremely durable, and has a narrow flight distance of 5. It is a short one that can be used even in the field. Furthermore, with the golf ball of the present invention, the safety 11 can be maintained at a lower net height than ever before. In addition, the useful life of the net 1~ may be extended.

The present invention will be explained in more detail with reference to Examples.

and ! 1 Golf balls were manufactured using the formulations shown in Table 1. The manufacturing method and vulcanization temperature were also as shown in Table 1.

For comparison, a golf ball according to the above-mentioned Patsch patent was manufactured and designated as Comparative Example 1. In addition, special public service 55-1961
A golf ball shown in Publication No. 5 was manufactured as Comparative Example 2. The various properties of the obtained golf ball were investigated and are listed in Table 1.

Example 1 is a combination of 5 parts by weight of butyl rubber and calcium carbonate, and 1 part by weight of butyl rubber/zinc oxide masterbatch method.
It was vulcanized and molded at 75°C.

The durability is significantly improved compared to Comparative Example 2, the flight distance of 11111 is shortened, and the maximum height reached is reduced by 12%, and the feel and impact at impact are significantly improved compared to Comparative Example 1.

In Example 2, the butyl rubber of Example 1 was added to 25 parts by weight, and compared to Example 1, the flight distance was further shortened by 7 m and the height was reduced by 7%.

Example 3 is obtained by adding 6 parts by weight of low-cis-volume clay to Example 2, and as compared to Examples 1 and 2, both the feel and the sound at impact are further improved.

In Example 4, the butyl rubber in Example 2 was replaced with chlorinated butyl rubber, and compared to Example 2 (the feel at impact was slightly different due to the softness, but relatively similar results were obtained). It is being

Example 5 is obtained by removing calcium carbonate from Example 2 and is slightly softer, so it is known that the improvement with the calcium carbonate blend is improved.

Example 6 is a polybutadiene-zinc oxide masterbatch system, and the effects of the present invention are i! in terms of physical properties. However, there are some manufacturing difficulties, and the effectiveness of the butyl rubber/zinc oxide masterbatch method is demonstrated.

In Example 7, Example 2 was carried out at a general vulcanization speed, and the conditions are those used in situations where control of flight performance is more important than feel at impact.

Claims (1)

[Claims] 1. 3 to 3 parts of low-resilience rubber based on 100 parts by weight of the base rubber
35 parts by weight, 20-30 parts of methacrylic acid, and 20-50 parts of a metal compound capable of forming a metal salt with methacrylic acid.
A driving range golf ball obtained by vulcanizing a composition containing parts by weight. 2. The driving range golf ball according to item 1, wherein the base rubber is polybutadiene rubber containing 95% or more of cis-1,4 bonds. 3. The driving range golf ball according to item 2, wherein the base rubber contains 1 to 10 parts by weight of the following polybutadiene rubber having 40% of cis-1,4 bonds. 4. The golf ball for practice ranges according to any one of items 1 to 3, wherein the low repulsion rubber is butyl rubber or chlorinated butyl rubber. 5. The driving range golf ball according to any one of items 1 to 4, wherein the metal compound is zinc oxide. 6. 0.1 thiobisphenol anti-aging agent in the composition
5. The golf ball for driving ranges according to items 1 to 5, which contains 1.0 parts by weight and 0.5 to 3.0 parts by weight of a free radical initiator. 7. The driving range golf ball according to items 1 to 6, wherein the composition contains 3 to 20 parts by weight of calcium carbonate. 8. Vulcanization temperature is 1.70℃~180℃
f! The driving range golf ball according to items 1 to 7. 9. After forming a master badge with 3 to 35 parts by weight of low repulsion rubber and 20 to 50 parts by weight of a metal compound that forms a metal salt on methacrylic acid, blend it with 100 parts by weight of the base rubber and at the same time add 20 to 20 parts by weight of methacrylic acid. A method for producing a golf ball for a driving range, comprising the steps of: adding 30 parts by weight to form a composition shown in graphs 1 to 1, and then vulcanizing the composition. 10. The manufacturing method according to item 9, wherein the base rubber is polybutadiene rubber containing 95% or more of cis-1,/11 bonds. 11. The manufacturing method according to item 9 or 10, wherein the base rubber contains 1 to 10 parts by weight of polybutadiene rubber having 40% or less of cis-1,4 bonds. 12. The manufacturing method according to Items 91A to 11, wherein the low repulsion rubber is butyl rubber, preferably chlorinated butyl rubber. 13. The manufacturing method according to items 9 to 12, wherein the metal compound is zinc oxide. 14. The composition contains a thiobisphenol anti-aging agent.
14. The method according to paragraphs 9 to 13, comprising 1 to 1.0 parts by weight and 05 to 3.0 parts by weight of a free radical initiator. 15. The manufacturing method according to items 9 to 14, wherein the composition contains 3 to 20 parts by weight of calcium carbonate. 16. The manufacturing method according to items 9 to 15, wherein the vulcanization temperature is 170 to 180°C.