JP2002348467A - Composition for golf ball and golf ball using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a golf ball which realizes a soft hit feeling characteristic and has an excellent distance performance. SOLUTION: The golf ball 20 contains a core 22, an intermediate layer 24 and a cover 26 in this order from the inside. The cover 26 is composed of a composition obtained by adding at least one selected from the group consisting of a modified polyolefin modified with an unsaturated carboxylic acid or an unsaturated carboxylic acid anhydride, a modified polyolefin-based copolymer modified with an unsaturated carboxylic acid or an unsaturated carboxylic acid anhydride and a polyolefin-based copolymer having an unsaturated carboxylic acid anhydride or a glycidyl ester as a comonomer to a mixture of a polyamide-based elastomer and a polyamide resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf ball composition and a golf ball using the same, and more particularly, to a golf ball composition which is soft, has excellent resilience and good cut resistance. The present invention relates to an object and a golf ball using the same.

[0002]

2. Description of the Related Art Ionomer resins are widely used as raw materials for golf ball covers. The reason is that since the ionomer resin has excellent resilience, a golf ball having excellent flight distance performance can be obtained. Further, in a golf game, a player sometimes performs a so-called cut hitting method in which a ball is intended to be hit with a spin, and the ionomer resin has durability to the cut hitting method (hereinafter referred to as cut resistance). It is also excellent.

[0003] By the way, since ionomer resins are generally high in hardness, golf balls having covers made of ionomer resins are hard to feel (hit feeling) when hit, and have good controllability. There is a problem that it is difficult.

[0004] Therefore, various studies have been made on a material which can provide a soft feel at impact and can easily fly a golf ball in an intended direction. For example,
Japanese Patent Application Laid-Open No. 54-126137 proposes a golf ball having a layer made of a polyamide elastomer as a cover. However, in this case, it has been pointed out that the resilience of the cover is not sufficient, resulting in a golf ball having poor flight distance performance.

[0005] Japanese Patent Application Laid-Open No. 9-70451 discloses that
It has been proposed to use a composition comprising a polyamide elastomer and a polyamide resin as a cover. However, since the compatibility between the polyamide elastomer and the polyamide resin is generally not good, golf balls having poor appearance may be produced. That is, when a mixture of a polyamide-based elastomer and a polyamide resin is used as a raw material for the cover, a disadvantage that the yield of golf balls as products is reduced has become apparent. Furthermore, even if the appearance is good, the cut resistance tends to be poor.

Accordingly, various studies have been made to use a material capable of softening the shot feeling without deteriorating the flight distance performance as a raw material of the cover. As a result, a polyamide-based elastomer, a polyurethane-based elastomer, a polyester-based elastomer, etc. It has been found that thermoplastic elastomers and mixtures of such thermoplastic elastomers and ionomer resins are suitable materials.

[0007]

However, in the case of a golf ball having a cover made of a mixture of a polyurethane elastomer and an ionomer resin among the thermoplastic elastomers described above, it is difficult to say that the resilience is necessarily good. It has been reported that flight distance performance may be poor.

[0008] In addition, there are not a few players who desire a golf ball which can obtain a softer shot feeling as compared with a golf ball having a cover made of the above-mentioned thermoplastic elastomer or mixture. To obtain a golf ball with a soft feel at impact, it is sufficient to lower the hardness of the cover.However, a flexible cover that makes the feel at impact softer has poor resilience, so that a golf ball has low flight distance performance. This leads to the problem of becoming

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a golf ball composition which provides a golf ball with a soft feel at impact and excellent flight distance performance, and a golf ball using the same. With the goal.

[0010]

In order to achieve the above object, the present invention provides a modified olefin, an unsaturated carboxylic acid or an unsaturated carboxylic acid anhydride modified with an unsaturated carboxylic acid or an unsaturated carboxylic acid anhydride. Olefin copolymer modified with a olefin copolymer, at least one selected from the group of olefin copolymers having an unsaturated carboxylic anhydride or glycidyl ester as a copolymer component, and a polyamide elastomer are mixed. It is characterized by having.

The polyamide elastomer has improved resilience in the presence of a component selected from the above group. Also,
The polyamide elastomer itself has excellent flexibility. Therefore, this composition has flexibility derived from the polyamide-based elastomer, while exhibiting excellent resilience.

It is to be noted that at least one selected from the group
The ratio of the seed is preferably 1 to 15 parts by weight based on 100 parts by weight of the polyamide elastomer. When the amount is less than 1 part by weight, the effect of improving the resilience of the polyamide elastomer becomes poor. If the amount exceeds 15 parts by weight, the resilience of the composition becomes poor.

The above composition can be used as a raw material for any layer constituting a golf ball, but when used as a raw material for a cover,
It is particularly preferred that 100 parts by weight of the polyamide-based elastomer contains 50 parts by weight or more of a type having an elongation to break of 550% or more in a tensile test. In this case, the durability of the composition becomes particularly excellent, so that a cover having excellent cut resistance can be provided.

The present invention also relates to a modified olefin modified with an unsaturated carboxylic acid or an unsaturated carboxylic acid anhydride, a modified olefin-based copolymer modified with an unsaturated carboxylic acid or an unsaturated carboxylic acid anhydride, At least one selected from the group of olefin copolymers having a saturated carboxylic anhydride or glycidyl ester as a copolymer component, a polyamide elastomer, and a polyamide resin are mixed, and the polyamide elastomer and the polyamide resin are mixed. When the total is 100 parts by weight, the ratio of the polyamide resin is 40 parts by weight or less.

The polyamide-based elastomer and the polyamide resin disperse well in the presence of a component selected from the above group. That is, the compatibility state becomes good. For this reason, while this composition has flexibility like the above-mentioned composition, it becomes more excellent in resilience. Also,
Durability also improves.

In this case, the proportion of at least one selected from the group is preferably 1 to 15 parts by weight when the total of the polyamide elastomer and the polyamide resin is 100 parts by weight. If the amount is less than 1 part by weight, the effect of improving the compatibility between the polyamide elastomer and the polyamide resin becomes poor. If the amount exceeds 15 parts by weight, the resilience of the composition becomes poor.

This composition can also be used as a raw material for any layer as long as it is a layer constituting a golf ball. When used as a raw material for a cover, a total of 100% of a polyamide-based elastomer and a polyamide resin is used.
In the weight part, the elongation to failure in the tensile test is 5
5% or more of the type of polyamide elastomer showing 50% or more
Preferably, it is contained in an amount of 0 parts by weight or more. in this case,
This is because the durability of the composition becomes particularly excellent, so that a cover having excellent cut resistance can be provided.

In any case, the polyamide elastomer preferably has a Shore D hardness of 60 or less. If it exceeds 60, the golf ball tends to have a hard feel at impact.

On the other hand, the polyamide resin preferably has a Rockwell hardness of R scale of 100 or more.
This is because a layer in which resilience is secured can be formed.

Further, the present invention provides a modified olefin modified with an unsaturated carboxylic acid or an unsaturated carboxylic acid anhydride, a modified olefin-based copolymer modified with an unsaturated carboxylic acid or an unsaturated carboxylic acid anhydride,
A layer comprising a composition in which at least one selected from the group of olefin copolymers having an unsaturated carboxylic anhydride or glycidyl ester as a copolymer component, and a polyamide elastomer are provided. I do.

As described above, since the composition is flexible and excellent in resilience, the golf ball according to the present invention can provide a soft feel at impact and an excellent flight distance performance.

As described above, a suitable ratio of at least one selected from the group is 1 to 15 parts by weight based on 100 parts by weight of the polyamide elastomer.

When a cover is made of this composition, 100 parts by weight of the polyamide elastomer is
It is preferable that the polyamide elastomer contains at least 50 parts by weight of a polyamide-based elastomer having an elongation at break of 550% or more in a tensile test. In this case, the cover becomes excellent in cut resistance. That is, the life of the golf ball can be extended.

Further, the present invention provides a modified olefin modified with an unsaturated carboxylic acid or an unsaturated carboxylic acid anhydride, a modified olefin-based copolymer modified with an unsaturated carboxylic acid or an unsaturated carboxylic acid anhydride, At least one selected from the group of olefin copolymers having an unsaturated carboxylic anhydride or glycidyl ester as a copolymer component, a polyamide elastomer, and a polyamide resin are mixed, and the polyamide elastomer Sum 1 with polyamide resin
When the amount is 00 parts by weight, a layer comprising a composition having a polyamide resin ratio of 40 parts by weight or less is provided.

In this layer, the compatibility between the polyamide elastomer and the polyamide resin is good. For this reason,
This layer has better resilience while having flexibility. Also, the durability is improved. That is, the golf ball exhibits more excellent flight distance performance and cut resistance.

The preferable ratio of at least one selected from the group is, as described above, when the total of the polyamide elastomer and the polyamide resin is 100 parts by weight.
1 to 15 parts by weight. Similarly to the above, when forming a cover from this composition, in a total of 100 parts by weight of the polyamide-based elastomer and the polyamide resin,
It is preferable that the polyamide elastomer contains at least 50 parts by weight of a polyamide-based elastomer having an elongation at break of 550% or more in a tensile test.

As described above, as the polyamide-based elastomer which is a constituent component of the composition, one having a Shore D hardness of 60 or less is preferable.

Further, when a polyamide resin is mixed to form a composition, the polyamide resin preferably has an R scale Rockwell hardness of 100 or more.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the composition for golf balls according to the present invention will be described below in relation to a golf ball having a layer made of the composition for golf balls, with reference to the accompanying drawings. And will be described in detail.

FIG. 1 shows a golf ball according to a first embodiment of the present invention. The golf ball 10 includes a core 12 and
A two-piece solid golf ball having a cover 14 covering the core 12.

Examples of the constituent material of the core 12 include a rubber composition having a base material of generally used natural rubber or synthetic rubber. Specific examples of the rubber composition include those in which a polybutadiene rubber, a metal salt of an unsaturated carboxylic acid such as zinc acrylate, and a filler such as an organic peroxide such as dicumyl peroxide and a zinc oxide are mixed together. Can be The rubber composition may further contain an antioxidant, a coloring agent, and the like, if necessary.

The cover 14 is made of a composition. The composition comprises a modified olefin modified with an unsaturated carboxylic acid or an unsaturated carboxylic acid anhydride, a modified olefin-based copolymer modified with an unsaturated carboxylic acid or an unsaturated carboxylic acid anhydride, or an unsaturated carboxylic acid anhydride. And at least one selected from the group of olefin copolymers having a copolymer or a glycidyl ester as a copolymer component, and a polyamide elastomer. Such a composition can be easily produced by mixing and melting and solidifying the components described above.

The polyamide elastomer is flexible by itself, but when at least one selected from the above group is present, the resilience is improved. That is, a mixture of the polyamide-based elastomer and the above-mentioned group is a flexible material having high resilience. In other words, in this case, by providing the cover 14 containing a polyamide elastomer as a main component, the shot feeling is softened and the cover 1
By making at least 4 contain at least one selected from the group, the flight distance performance of the golf ball 10 can be improved.

Here, the modified olefin is an olefin whose steric structure has been lost (modified) without a covalent bond being cut by an anhydride of an unsaturated carboxylic acid, such as modified polyethylene or modified polypropylene. It can be mentioned as a suitable example. Incidentally, examples of the unsaturated carboxylic acid modifying the olefin include acrylic acid, methacrylic acid, crotonic acid, fumaric acid and the like, and examples of the unsaturated carboxylic anhydride include maleic anhydride and itaconic anhydride. be able to.

The modified olefin-based copolymer is
It is a copolymer of a modified olefin modified with an unsaturated carboxylic acid or an unsaturated carboxylic anhydride as described above, and at least one other component. Suitable examples of such a copolymer include a modified ethylene-propylene copolymer and a modified ethylene-vinyl acetate copolymer.

Further, as the olefin-based copolymer,
A copolymer having an unsaturated carboxylic acid or glycidyl ester as a copolymer component is selected. That is, this copolymer is a copolymer of an olefin and an unsaturated carboxylic acid or a glycidyl ester, and preferable examples thereof include an ethylene-glycidyl (meth) acrylate copolymer and ethylene-vinyl acetate-glycidyl ( Meth) acrylate terpolymer, ethylene- (meth) acrylate-maleic anhydride terpolymer, ethylene-
A (meth) acrylate-glycidyl (meth) acrylate terpolymer can be used. In addition,
Examples of the (meth) acrylic acid ester include (meth) acrylic acid methyl ester, ethyl ester, n-butyl ester, isobutyl ester and the like.

On the other hand, the polyamide elastomer preferably has a Shore D hardness of 60 or less. If it exceeds 60, the golf ball 10 tends to have a hard feel at impact.

In this case, the polyamide elastomer has an elongation at break of 5 in the tensile test.
Those showing 50% or more are preferred. If the elongation is less than 550%, the cut resistance becomes poor. In addition, the elongation here is calculated assuming that the original length is 100%. For example, if the length of the sample before the tensile test was performed was 10 cm and the length of the sample immediately before breaking in the tensile test was 70 cm, the elongation was 700%.

Preferred examples of polyamide elastomers having a Shore D hardness of 60 or less and an elongation of 550% or more include nylon-6, nylon-11 and nylon-1.
2. A block copolymer containing a polyamide component such as an aromatic polyamide in a hard segment can be given.

Examples of the soft segment constituting the polyamide elastomer block copolymer together with the hard segment include polyoxyalkylene glycol such as polyoxytetramethylene glycol and polyoxypropylene glycol, and fatty acid polyester. .

It is sufficient that the polyamide-based elastomer contains at least 50 parts by weight of a polyamide-based elastomer having an elongation of 550% or more. That is, the polyamide elastomer which is one of the constituent materials of the cover 14 is, for example, a mixture of 75 parts by weight of a polyamide elastomer having an elongation of 550% or more and 25 parts by weight of a polyamide elastomer having an elongation of less than 550%. There may be.

The proportion of the component selected from the above group is 1 to 15 parts by weight per 100 parts by weight of the polyamide elastomer.
It is preferable to use parts by weight. If the amount is less than 1 part by weight, the effect of improving the resilience of the polyamide elastomer tends to be poor. If it exceeds 15 parts by weight, the resilience of the cover 14 becomes poor. When the polyamide-based elastomer is a mixture of different polyamide-based elastomers, the proportion of the component selected from the above group is:
The amount is preferably 1 to 15 parts by weight based on 100 parts by weight of the mixture.

The cover 14 has, in addition to the above-described composition, an antioxidant, a coloring agent, a filler, a light stabilizer, an ultraviolet absorber,
An ultraviolet stabilizer, a fluorescent whitening agent, a dispersant, an antistatic agent and the like may be mixed as necessary. In addition, if the amount is such that the flexibility and resilience of the cover 14 are not reduced,
A polymer such as a thermoplastic resin or a thermoplastic elastomer may be mixed.

In the cover 14 of the golf ball 10 according to the first embodiment, the resilience of the polyamide elastomer is improved because the components selected from the above group coexist. The cover 14 is flexible due to the flexibility of the polyamide elastomer. Therefore, a golf ball 10 having a soft feel at impact and excellent flight distance performance can be obtained.

Next, FIG. 2 shows a golf ball according to a second embodiment of the present invention. The golf ball 20 according to the second embodiment is a three-piece solid golf ball having a core 22, an intermediate layer 24, and a cover 26 in this order from the inside.

The core 22 is made of a rubber composition, like the core 12 of the golf ball 10 according to the first embodiment. Of course, also in this case, an antioxidant, a coloring agent and the like may be blended.

Preferable examples of the constituent material of the intermediate layer 24 include an ionomer resin, but are not particularly limited thereto, and may be a thermoplastic elastomer represented by a polyamide elastomer or the like. It may be a mixture of a thermoplastic elastomer and an ionomer resin.

The cover 26 is formed by mixing at least one member selected from the group described above, a polyamide elastomer, and a polyamide resin. This composition also
It can be easily produced by mixing and melting and solidifying the above components.

Among them, the polyamide resin is used for the cover 26.
Plays a role in further improving the resilience of the tire. That is,
The golf ball 20 exhibits more excellent flight distance performance than the golf ball 10 described above.

When the total of the polyamide elastomer and the polyamide resin is 100 parts by weight, the proportion of the polyamide elastomer is at least 60 parts by weight, and the proportion of the polyamide resin is at most 40 parts by weight. When the proportion of the polyamide-based elastomer is less than 60 parts by weight and the proportion of the polyamide resin exceeds 40 parts by weight, the hardness of the cover 26 is increased, so that it is difficult to obtain a soft feel at impact.

When the proportion of the polyamide resin is set as described above, the polyamide resin is preferably of a type having an R scale Rockwell hardness (hereinafter, referred to as _HRR ) of 100 or more. In this case, the resilience required for the cover 26 can be ensured. Preferred examples of this type of polyamide resin include nylon-11,
Nylon-12, Nylon-6,10, Nylon-6
12, Nylon-6, Nylon-6,6, Nylon-M
Aliphatic polyamide resins such as XD6 and nylon-4, 6;
Alternatively, an aromatic polyamide resin may be used.

Here, as for the polyamide-based elastomer, it is preferable that the elongation to breakage in the tensile test is 550% or more in the same manner as described above. In this case, the constituent material of the cover 26 has an elongation of 55.
50% or more of the polyamide-based elastomer of 0% or more
What is necessary is just to contain by weight part or more. That is, the cover 26
Is a mixture mainly composed of, for example, 50 parts by weight of a polyamide elastomer having an elongation of 550% or more, 25 parts by weight of a polyamide elastomer having an elongation of less than 550%, and a polyamide resin. Is also good.

In this case, the component selected from the above group not only improves the resilience of the polyamide elastomer, but also acts to improve the compatibility between the polyamide elastomer and the polyamide resin. Therefore, the cover 26 having good appearance and cut resistance is formed on the golf ball 20.

The proportion of the components selected from the above group is 100 parts by weight of the total of the polyamide elastomer and the polyamide resin.
It is preferably 5 parts by weight. If the amount is less than 1 part by weight, the effect of improving the compatibility between the polyamide elastomer and the polyamide resin tends to be poor. If the amount exceeds 15 parts by weight, the resilience of the cover 26 becomes poor. When two or more polyamide-based elastomers are contained in the cover 26, the proportion of the component selected from the above group should be 1 to 15 parts by weight based on 100 parts by weight of the mixture and the polyamide resin in total. Is preferred.

The cover 26, like the cover 14, includes an antioxidant, a coloring agent, a filler, a light stabilizer, an ultraviolet absorber, an ultraviolet stabilizer, a fluorescent brightener, a dispersant, an antistatic agent, and the like. They may be mixed as needed. Further, a polymer such as a thermoplastic resin or a thermoplastic elastomer may be mixed as long as the flexibility and resilience of the cover 26 are not reduced.

In the cover 26 of the golf ball 20 according to the second embodiment described above, the compatibility between the polyamide elastomer and the polyamide resin is improved by the components selected from the above group. For this reason, the cover 26
While having flexibility, resilience is improved as compared with a case where only a polyamide elastomer and a polyamide resin are mixed. Therefore, the golf ball 20 has a soft feel at impact and further excellent flight distance performance. Moreover, the golf ball 2 has a good appearance and excellent cut resistance.
0 can also be obtained.

In the above-described embodiment, the golf ball 10 having the covers 14 and 26 as the layer made of the composition containing the polyamide-based elastomer as a main component.
Although the golf ball according to the present invention is not limited to this example, the golf ball according to the present invention is not limited thereto, and may be any golf ball having at least one layer made of the composition. For example, in a three-piece golf ball having a core, an intermediate layer, and a cover, at least one of the intermediate layer and the cover may be formed from the composition.

Although the block copolymer has been exemplified as the polyamide-based elastomer, it is needless to say that a graft copolymer may be used.

[0059]

EXAMPLE A mixture of cis-1,4-polybutadiene, zinc acrylate, zinc oxide, an antioxidant, and dicumyl peroxide in a ratio of 100: 29: 23: 0.5: 3 (weight ratio, the same applies hereinafter). Then, they are compression-molded while being heated, and are made of a rubber composition having the above-mentioned component and composition ratio.
An 8.3 mm core was made.

Next, Pebax 1205MX (trade name of polyamide elastomer manufactured by Atochem, elongation = 600)
%, Shore D hardness = 42) and Rilsan BMNO as a polyamide resin (trade name of nylon-11 manufactured by Atochem, H _RR = 105) were mixed at a ratio of 75:25,
Further, 100 parts by weight of this mixture was added to Elvaloy AS (ethylene-n-
Butyl acrylate-glycidyl methacrylate terpolymer (trade name) was added at a ratio of 5 parts by weight to obtain a raw material of the composition. Then, the composition was heated with stirring using a Banbury mixer to obtain a fluid, and the fluid was injection-molded on the surface of the core to produce a cover having a diameter of 4%.
A 2.7 mm two-piece solid golf ball was obtained.
This is referred to as Example 1.

Further, instead of Rilsan BMNO, Rilsan AMNO (trade name of nylon-12 manufactured by Atochem, H
_RR = 108) and the proportion of Elvaloy AS is 1
A two-piece solid golf ball was produced in the same manner as in Example 1 except that the amount was 0 parts by weight. This is Example 2.

Further, Pebax 1205MX and Pebax 3533SN01 (trade name of polyamide elastomer manufactured by Atochem, elongation = 480%, Shore D hardness =
35) and Rilsan BMNO were mixed at a ratio of 50:25:25 to produce a two-piece solid golf ball according to Example 1. This is referred to as a third embodiment.

For comparison, Pebax 1205M
A two-piece solid golf ball was manufactured according to Example 1, except that the cover was formed from a mixture of X and Rilsan BMNO. This is referred to as Comparative Example 1.

Further, a two-piece solid golf ball having a cover whose main component is an ionomer resin was produced. That is, Pevacs 3533SN01, Himilan 1605 (trade name of sodium ion neutralization type ionomer resin manufactured by Dupont Mitsui Polychemicals, Shore D hardness = 67), and Himilan 1706 (zinc ion neutralization type manufactured by Dupont Mitsui Polychemicals) Ionomer resin trade name, Shore D hardness = 66) and 40: 3
The mixture was mixed at a ratio of 0:30. Elvaloy AS was added at a ratio of 5 parts by weight to 100 parts by weight of this mixture to prepare a raw material for the cover. Hereinafter, a two-piece solid golf ball was manufactured according to Example 1. This was compared with Comparative Example 2
And

The resilience of each of the two-piece solid golf balls of Examples 1 to 3 and Comparative Examples 1 and 2 was evaluated. Specifically, the No. 1 wood club was set on the swing robot device, each golf ball was hit, and the initial speed was measured, and the index was determined with the initial speed of Comparative Example 1 being 100. The higher the value, the higher the initial velocity of the ball, ie, the more resilience, and therefore,
This means that the golf ball has excellent flight distance performance. The results are shown in FIG.

From FIG. 2, it can be seen that the golf balls of Examples 1 to 3 have the same or higher initial velocity as compared with the golf balls of Comparative Examples 1 and 2, that is, have excellent resilience and excellent flight distance performance. It is clear that it is excellent.

The golf balls of Examples 1 to 3 and Comparative Examples 1 and 2 were hit so that the golf balls would spin, and the appearance after hitting was visually evaluated. The results are shown in FIG. 3 together with "very good" as ◎, "good" as ○, and "poor" as x. FIG. 3 also shows the Shore D hardness of each cover.

As will be understood from FIG.
In the golf ball of No. 1, the appearance was extremely well maintained. That is, it was recognized that the cut resistance was excellent. In contrast, in the golf balls of Comparative Examples 1 and 2,
The appearance after hitting was "good" or "poor". In other words, the cut resistance was lower than those of the golf balls of Examples 1 to 3. The reason is that there is no correlation between the cut resistance and the Shore D hardness of the cover. Therefore, the golf balls of Comparative Examples 1 and 2 were prepared by mixing the polyamide elastomer with the component selected from the above group. This is considered to be because there is no cover provided, or a cover in which a polyamide elastomer and a polyamide resin are mixed with a component selected from the above group.

[0069]

As described above, according to the golf ball composition of the present invention, the unsaturated carboxylic acid or unsaturated carboxylic acid is added to the polyamide elastomer alone or the mixture of the polyamide elastomer and the polyamide resin. Modified olefin modified with acid anhydride, modified olefin copolymer modified with unsaturated carboxylic acid or unsaturated carboxylic anhydride, olefin copolymer having unsaturated carboxylic anhydride or glycidyl ester as a copolymer component At least one selected from the group of polymers is added. While this component improves the resilience of the polyamide elastomer, the compatibility between the polyamide elastomer and the polyamide resin is improved. For this reason, while maintaining flexibility, the composition has improved resilience and durability.

Further, according to the golf ball of the present invention, since the golf ball has the layer composed of the above-described composition, the effect that the hitting feeling is soft, the flight distance performance is excellent, and the cut resistance is excellent is achieved. .

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a golf ball according to a first embodiment of the present invention.

FIG. 2 is a schematic sectional view of a golf ball according to a second embodiment of the present invention.

FIG. 3 is a table showing the cover forming materials and their ratios in the two-piece solid golf balls of Examples 1 to 3 and Comparative Examples 1 and 2, and the characteristics of the balls.

[Explanation of symbols]

10, 20 ... golf balls 12, 22
... Core 14, 26 ... Cover 24 ... Intermediate layer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) (C08L 77/00 23:02)

Claims (16)

[Claims] 1. A modified olefin modified with an unsaturated carboxylic acid or an unsaturated carboxylic acid anhydride, a modified olefin-based copolymer modified with an unsaturated carboxylic acid or an unsaturated carboxylic acid anhydride, or an unsaturated carboxylic acid anhydride. A composition for golf balls, characterized in that at least one selected from the group of olefin copolymers having a copolymer or a glycidyl ester as a copolymer component is mixed with a polyamide elastomer. 2. The composition according to claim 1, wherein the proportion of at least one selected from the group is 1 to 15 parts by weight based on 100 parts by weight of the polyamide elastomer. Composition for balls. 3. The composition according to claim 1, wherein
When the golf ball composition is used as a cover for a golf ball, the polyamide elastomer 100
In the weight part, the elongation to failure in the tensile test is 5
5% or more of the type of polyamide elastomer showing 50% or more
A composition for a golf ball, wherein the composition is contained in an amount of 0 part by weight or more. 4. A modified olefin modified with an unsaturated carboxylic acid or an unsaturated carboxylic acid anhydride, a modified olefin-based copolymer modified with an unsaturated carboxylic acid or an unsaturated carboxylic acid anhydride, and an unsaturated carboxylic acid anhydride. At least one selected from the group of olefin copolymers having a copolymer or a glycidyl ester as a copolymer component, a polyamide elastomer, and a polyamide resin, and the total of the polyamide elastomer and the polyamide resin is 100 wt. The composition for a golf ball, wherein the proportion of the polyamide resin is 40 parts by weight or less. 5. The composition according to claim 4, wherein the proportion of at least one selected from the group is 1 to 15 parts by weight when the total of the polyamide elastomer and the polyamide resin is 100 parts by weight. A composition for a golf ball, comprising: 6. The composition according to claim 4, wherein
When the golf ball composition is used as a cover for a golf ball, a polyamide of the type showing an elongation to break of 550% or more in a tensile test in a total of 100 parts by weight of the polyamide-based elastomer and the polyamide resin. A composition for a golf ball, comprising at least 50 parts by weight of a system elastomer. 7. The composition according to claim 1, wherein the polyamide elastomer has a Shore D hardness of 60 or less. 8. The composition according to claim 4, wherein the polyamide resin has a Rockwell hardness of R scale of 100 or more. . 9. A modified olefin modified with an unsaturated carboxylic acid or an unsaturated carboxylic acid anhydride, a modified olefin copolymer modified with an unsaturated carboxylic acid or an unsaturated carboxylic acid anhydride, and an unsaturated carboxylic acid anhydride. A golf ball comprising a layer comprising a composition in which a polyamide elastomer is mixed with at least one selected from the group of olefin copolymers having a copolymer or a glycidyl ester as a copolymer component. 10. The golf ball according to claim 9, wherein
A golf ball, wherein the proportion of at least one selected from the group in the composition is 1 to 15 parts by weight based on 100 parts by weight of the polyamide-based elastomer. 11. The golf ball according to claim 9, wherein 100% by weight of the polyamide elastomer constituting the composition has an elongation at break of at least 550% in a tensile test. A golf ball comprising a polyamide-based elastomer in an amount of 50 parts by weight or more, and a layer comprising the golf ball composition as a cover. 12. A modified olefin modified with an unsaturated carboxylic acid or an unsaturated carboxylic acid anhydride, a modified olefin copolymer modified with an unsaturated carboxylic acid or an unsaturated carboxylic acid anhydride, or an unsaturated carboxylic acid anhydride. At least one selected from the group of olefin copolymers having a copolymer or a glycidyl ester as a copolymer component, a polyamide elastomer, and a polyamide resin, and a total of the polyamide elastomer and the polyamide resin. Is 100 parts by weight, a golf ball comprising a layer comprising a composition having a polyamide resin ratio of 40 parts by weight or less. 13. The golf ball according to claim 12, wherein at least one selected from the group in the composition.
The proportion occupied by the species is 1 when the total of the polyamide-based elastomer and the polyamide resin is 100 parts by weight.
1 to 15 parts by weight. 14. The golf ball according to claim 12, wherein the total of 100 parts by weight of the polyamide elastomer and the polyamide resin constituting the composition has an elongation to break of 550 in a tensile test. %
A golf ball comprising at least 50 parts by weight of a polyamide-based elastomer of the type described above, and wherein the layer comprising the composition is a cover. 15. The golf ball according to claim 12, wherein the polyamide elastomer as a component of the composition has a Shore D hardness of 60.
A golf ball characterized by the following. 16. The golf ball according to claim 9, wherein the polyamide resin as a component of the composition has a Rockwell hardness of R scale of 100 or more. Characteristic golf ball.