KR100995019B1 - Golf ball - Google Patents

Abstract

PURPOSE: A golf ball is provided, which can increase total flying distance since trajectory becomes low and angle becomes small when falls to the surface. CONSTITUTION: A golf ball comprises: a central part(30); two intermediate layers(20,22) which successively surround the central part; and an external layer(10) which surrounds the intermediate layer. The external layer has thickness of 0.8-1.4mm and hardness of 40-50. The first intermediate layer has thickness of 1.0-2.0mm and hardness 50-65. Each intermediate layer locating under the first intermediate layer has thickness of 1.3-15mm and gradient of 30-70.

Description

Golf ball {Golf ball}

The present invention relates to a golf ball, more specifically, in the approach shot of less than 100yd is well spin and easy to set up on the green, when the driver hits the spin is reduced to lower the trajectory and run (run) is increased It's about golf balls that increase the total distance.

In the UK, R & A and USGA of the United States have been using the grooves (clubface groove) of irons (from 5th iron to wedge) for more than 25 degrees of loft from January 1, 2010. A new rule states that grooves divided by pitch (width + spacing) are limited to 0.003 square inches (0.0762 square mm), and the groove edge sharpness is limited to a minimum effective radius of 0.010 inches (0.254 mm). It was.

Many studies have shown that the current U-groove club has significantly increased spin in the rough compared to the time when the V-groove club was used in the past, so that the difference in spin between the fairway shot and the rough shot is almost equal, reducing the value of accuracy. This is true by the results.

Therefore, the purpose of this club groove regulation is to increase the difference in spin between fairway shots and rough shots, and in particular to play in rough, demanding a high level of skill, which is important to the accuracy of shots, i.e. the benefit from accurate shots. It can be said to further increase.

On the other hand, since the core of the changed club rules is that it is difficult to spin, development of a ball that spins well is urgently needed. In other words, the athlete's product currently on the market uses a material with a hardness of 50 or more (unit: Shore D, or less). When the ball with such hardness is hit with an iron that satisfies the new regulations, It is difficult to give enough spin, which makes it difficult for the golf player to hit the ball to the desired spot.

Therefore, it is possible to give a desired level of spin only by using a golf ball using a lower hardness material as a cover material. However, in the case of a golf ball that uses a material with a low hardness as a cover, the spin can be properly increased, but at the same time, when the driver strikes, the forward force is distributed by the reverse rotation force, and the ballistic force is caused by excessive lift. Is increased so that the angle falling to the ground becomes large, the run (run) is reduced, thereby causing a problem that the flying distance is significantly reduced.

As a result, there is a need for the development of a new golf ball that is easy to spin when hitting the iron and does not reduce the flying distance when hitting the driver.

The present invention was devised to satisfy the necessity as described above, and has a soft cover (outer layer), so that it is easy to set the green on the approach shot by spin, and at the same time limit the value of the moment of inertia when the driver strikes. The purpose of the present invention is to provide a golf ball capable of reducing the amount of spin generated and reducing the trajectory due to the suppression of excessive lift generation, the angle at which it falls to the ground, increasing the run, and eventually increasing the overall flying distance. .

Golf ball of the present invention, the golf ball comprising a central portion, at least two intermediate layers sequentially surrounding the central portion, and an outer layer surrounding the intermediate layer, the outer layer is 0.8 ~ 1.4mm thickness , Hardness (unit: Shore D) is 40-50, the first intermediate layer located directly below the outer layer of the intermediate layer, the thickness is 1.0 ~ 2.0mm, hardness (unit: Shore D (shore D) )) Is 50 to 65, and each of the remaining intermediate layers located directly below the first intermediate layer has a thickness of 1.3 to 15 mm, a hardness (unit: Shore D) of 30 to 70, and the radius of the central portion. The length is 5-18 mm, hardness (unit: shore D) is 30-70, and the moment of inertia of the said golf ball is 83 g * cm <2> or less.

On the other hand, the outer layer is made of an ionomer resin, the ionomer resin, a monoolefin containing at least a portion of unsaturated carbonic acid (carbonic acid) having 3 to 8 carbon atoms and the ester of the carbonic acid (ester) In (mono-olefin), it is preferable that it is an ionomer resin which neutralized at least one part with valence monovalent or divalent metal.

On the other hand, the outer layer is a polyurethane containing at least one of an ester type polyurethane, an ether type polyurethane, and an ether ester copolymer type polyurethane, and a poly made by polymerizing a polyol, diisocyanate, a chain extender, or the like. It is preferably made of urethane elastomer, or polyol and polyisocyanate made of two-component polyurethane used by mixing with each other during molding.

In addition, the first intermediate layer is made of an ionomer resin, wherein the ionomer resin is mono-containing at least a part of unsaturated carbonic acid having 3 to 8 carbon atoms and ester of the carbonic acid. It is preferable that it is an ionomer resin which neutralized at least one part to olefin (mono-olefin) with valent monovalent or divalent metal.

According to the golf ball of the present invention, the iron spin force is much superior to the conventional golf ball, but the driver's distance can achieve the equivalent performance.

In addition, since the outer layer (cover layer) is made of a relatively soft material, it is possible to obtain an effect that the putting and hitting feelings are also improved compared to the prior art.

1 is a schematic cross-sectional view of a golf ball of one embodiment according to the present invention;
2 is a schematic cross-sectional view of a golf ball of another embodiment according to the present invention.

In order to achieve the above object, the present invention, when viewed from the center of the first floor, the whole of the four layers (commonly referred to as "4PC (piece) ball"), five or more layers of golf ball in the production of each, After adjusting the thickness and density of the layers to give various moments of inertia, the swing robot and the flight performance measuring device were measured and analyzed by measuring the amount of spin and the distance of the golf ball.

Through this experiment, it was found that the moment of inertia of the golf ball should have a value of 83 g · cm 2 or less, and the requirements for the thickness and hardness of each of the outer layer, the first intermediate layer, the second intermediate layer, and the lower layers were found. Came out. Therefore, if the following requirements are satisfied, the desired spin amount can be obtained while the golf ball's moment of inertia is 83 g · cm 2 or less.

In the golf ball of the present invention, the outer layer (first outer cover) has a thickness of 0.8 to 1.4 mm, the hardness (Shore D) is 40 to 50, and the thickness of the first intermediate layer (first outer to second layer) is 1.0. It is -3.0mm, hardness (Shore D) is 50-65, the thickness of each layer is 1.3-15mm and the hardness (Shore D) is 30-70 from the 2nd intermediate | middle layer (third layer from the outermost one). The radius of the center is 5 ~ 18mm long and the hardness is Shore D 30 ~ 70.

Moreover, the golf ball of this invention has the moment of inertia of 83 g * cm <2> or less.

On the other hand, if the thickness of the outer layer is 0.8 mm or less, the flight deviation is large when hitting the part with and without the dimples formed on the surface of the golf ball, and the loss of the flying distance is great if it is 1.4 mm or more.

In addition, if the cover hardness (Shore D) of the outer layer is 50 or more, the iron spin generating force is lowered to achieve the object of the present invention, if the 40 or less driver distance is significantly reduced and the consumer's preference falls.

If the thickness of the first intermediate layer is 1.0 mm or less, the flying distance drops, and if it is 3.0 mm or more, the feeling of hitting becomes worse, which is not preferable. In addition, when the hardness (Shore D) of the first intermediate layer is 50 or less, the flying distance decreases, and when it is 65 or more, there is a problem in that the hitting feeling becomes worse.

From the second intermediate layer, the thickness of each layer is appropriately adjusted in consideration of the thickness of the other layer and the length of the radius of the center and the total diameter of the golf ball, between 1.3 to 15 mm. The length of the center radius is adjusted appropriately, taking into account the thickness of the different layers and the total diameter of the golf ball, between 5 and 18 mm.

That is, the golf ball of the present invention, in the case of a four-piece ball, is configured so that the thickness and hardness of the outer layer and the first intermediate layer meets the above requirements, and the thickness of the second intermediate layer is between 1.3 to 15 mm In this case, the radius of the center is composed of 5 ~ 18mm in error. In this case, the thickness of the second intermediate layer and the size of the central portion may be adjusted in consideration of the size of the golf ball total diameter.

For example, when the thickness of the second intermediate layer becomes thick, the radius of the center portion is configured to be relatively small so that the diameter of the golf ball is within a desired range. It is prescribed that the diameter of a golf ball for playing currently is 42.67 mm or more. However, most golf balls are usually slightly larger than 42.67 mm because the smaller diameter of the golf ball is advantageous for the flying distance. The diameter of the golf ball of the first and second embodiments of the present invention is also 42.7 mm.

In addition, even if the golf ball is a five-piece ball, the thickness and hardness of the outer layer and the first intermediate layer are configured to satisfy the above requirements, and the thickness of the second and third intermediate layers is between 1.3 and 15 mm, respectively. The radius of the center of gravity should be between 5-18mm. In this case, the thickness of the second and third intermediate layers may be appropriately adjusted to each other so that the size of the total diameter of the golf ball can be the desired size.

In addition, even if the golf ball is six or seven pieces, the thickness and hardness of the outer layer and the first intermediate layer are configured to satisfy the above-described requirements, and then the second, third, fourth, 5 The thickness of the middle layer is composed of 1.3 to 15mm each, and the radius of the center is to be configured to be between 5-18mm.

At this time, in the thickness of the second intermediate layer or less layer, if it is 1.3mm or less, it can not have a significant influence on the moment of inertia, and if it is 15mm or more, the thickness of the other layer can not be sufficiently secured in relation to other layers. , Not preferred.

In addition, in the case of the second intermediate layer or lower layer and the central portion, when the hardness (Shore D) has a value of 30 or less, the flying distance is remarkably decreased, and when the thickness is 70 or more, the feel of the shot is not good, and thus the material having a hardness of 30 to 70 It is appropriate to use.

In Fig. 1, the golf ball of the first embodiment according to the present invention is shown as a schematic sectional view.

The golf ball 1 of the first embodiment is a four-piece case. The golf ball 1 includes an outer layer 10, a first intermediate layer 20, a second intermediate layer 22, and a central portion 30. It consists of

The outer layer 10 has a thickness of 1.325 mm and a hardness of Shore D 48. On the other hand, in another embodiment, the thickness may have another value within the range of 0.8 ~ 1.4mm, the hardness may also have a different value between 40-50.

The outer layer 10 is made of ionomer resin. The ionomer resin is a monovalent or divalent metal in a mono-olefin containing at least a portion of unsaturated carbonic acid having 3 to 8 carbon atoms and an ester of the carbonic acid. At least part of it is neutralized.

Meanwhile, in another embodiment, the outer layer may be a polyurethane comprising at least one of ester type polyurethane, ether type polyurethane and ether ester copolymer type polyurethane.

This polyurethane is composed of a polyurethane elastomer made by polymerizing a polyol, diisocyanate, a chain extender, or the like, or a two-component polyurethane which is used by mixing polyol and polyisocyanate with each other during molding.

The first intermediate layer 20 has a thickness of 1.45 mm and a hardness of Shore D 45. On the other hand, in another embodiment, the thickness may have a different value within the range of 1.0 ~ 2.0mm, the hardness may also have a different value between 50 ~ 65.

The first intermediate layer 20 is made of ionomer resin. The ionomer resin is a monovalent or divalent metal in a mono-olefin containing at least a portion of unsaturated carbonic acid having 3 to 8 carbon atoms and an ester of the carbonic acid. At least part of the ionomer resin.

The second intermediate layer 22 has a thickness of 6.55 mm and a hardness of Shore D 45. On the other hand, in another embodiment, the thickness may have other values within the range of 1.3 to 15 mm, and the hardness may also have other values between 30 and 70.

The radius of the center portion 30 has a length of 12.05 mm and a hardness of Shore D 52. On the other hand, in another embodiment, the thickness may have other values within the range of 5-18 mm, and the hardness may also have other values between 30-70.

Specific materials of the second intermediate layer and the central portion are shown in the table below. However, the material may be appropriately selected in consideration of hardness, density, and the like.

The moment of inertia of the golf ball 1 of this embodiment is 82.36 g · cm 2. The formula to calculate is mentioned later.

In Fig. 2, the golf ball of the second embodiment according to the present invention is shown as a schematic cross-sectional view.

The golf ball 1a of the second embodiment is five pieces. The golf ball 1a includes the outer layer 10, the first intermediate layer 20, the second intermediate layer 22, and the third intermediate layer 24. And a central portion 30. The description of each structure is applied as it is, or modified suitably as the description of 1st Embodiment mentioned above.

On the other hand, as another embodiment according to the present invention, as a five-piece golf ball, the third and fourth embodiments are presented. The golf balls of the third and fourth embodiments are the same as the five-piece golf balls in comparison with the second embodiment, but the values of the physical properties of each layer and the central portion are different from those of the second embodiment. In the case of the third and fourth embodiments, the overall shape is similar to the second embodiment, and thus not shown in a separate drawing.

When the values of the diameter, weight, and hardness of the outer layer, the middle layer, and the center of each golf ball of the first, second, third, and fourth embodiments are shown in a table.

On the other hand, in the table below, Comparative Examples 1, 2, 3, and 4 which were compared with the Examples according to the present invention are described together.

In the following table, specific mixing ratios of the layers of the first example and comparative examples 1 to 4 are described.

In the following table, the compounding ratios of the layers of Examples 2, 3 and 4 and Comparative Examples 5 to 7 are described.

On the other hand, the formula for calculating the moment of inertia is the following two books "Fundamentals of Physics 7 / e by David Halliday, 2006, p302-p305" and "Physics for Scientists and Engineers with Modern Physics 6 / e by Raymond A. Serway, 2004, p211-p217 ".

As a general formula, the moment of inertia I of a four-layered non-homogeneous layer can be obtained from the equation The radius of each layer is r _i , and the density of each layer is ρ _i , going from the centrally located portion to the outside.

The moment of inertia (I) is

Using the above formula, the moments of inertia of the first, second, third and fourth examples and comparative examples presented above were obtained. In the table below, since the moment of inertia I uses units of g · cm 2, the length in the table given above was converted to cm.

In the following table, the flight performance values of Examples 1, 2, 3 and 4 and Comparative Examples 1 to 7 according to the present invention are described. The equipment used for the test was an Iron Byron Robot, Trackman measuring instrument, the Cita Club used Callaway Driver-'R'SHAFT-10.5 °, and the test site was Applicant's R & D center.

From the tables presented above, we can see that:

First, comparing Comparative Example 1 (2PC), Comparative Example 2 (3PC), and Comparative Example 3 (3PC), the spin amount of Comparative Example 2 (3PC) is the smallest at 1964, and the flying distance is the longest. This proves that the distance is longer when the moment of inertia is small and the amount of spin is small. However, 2PC, 3PC is not suitable as a golf ball according to the present invention because the distance of the cover is reduced compared to 4PC, 5PC because the cover is a single layer on the core,

Second, the first embodiment (4PC), Comparative Example 4 (compared to 4PC, the first embodiment, the amount of spin was smaller as 2001 and the flying distance was 0.5yd more, thereby demonstrating the moment of inertia of the present invention.

Third, Example 2 (5PC), Example 3 (5PC), and Example 4 (5PC) have an inertia moment of 83 (g · cm 2 or less), Comparative Example 5 (5PC), and Comparative Example 6 (5PC). In Comparative Example 7 (5PC), the moment of inertia was 83 (g · cm 2) or more, and the average distance of the second example (5PC), the third example (5PC), and the fourth example (5PC) was comparative example 5. (5PC), Comparative Example 6 (5PC), Comparative Example 7 (5PC) It was 2.2yd more than the average distance, it proved the moment of inertia of the present invention.

Meanwhile, terms used in the present specification are described as follows.

'Cover', in English, denotes 'cover' and refers to the outer layer, which is the outer layer of the golf ball, and the material is resin. 'Spin' is the English letter 'spin' and represents the rotation of the golf ball. 'Driver' stands for 'driver' in English and is the name of one of the golf clubs. 'Run' means 'run' in English and means the distance the golf ball rolls. 'Carry' is the English letter 'carry' and means the distance the golf ball flew. 'Iron' stands for 'iron' in English and is the name of one of the golf clubs. 'Groove' is the English letter 'groove' and points to the groove on the head of the golf club. 'Wedge' stands for 'wedge' in English and is the name of one of the golf clubs. 'Ionomer' stands for 'ionomer' in English and is the name of a resin containing metal ions.

1, 1a ... golf ball 10 ... outer layer
20 ... first intermediate layer 22 ... second intermediate layer
24 ... 3rd middle layer 30 ... center

Claims (4)

A golf ball comprising a central portion, at least two intermediate layers sequentially surrounding the central portion, and an outer layer surrounding the intermediate layer,
The outer layer, the thickness is 0.8 ~ 1.4mm, the hardness (unit: Shore D) is 40-50,
The first intermediate layer located directly below the outer layer of the intermediate layer, the thickness is 1.0 ~ 2.0mm, hardness (unit: Shore D) is 50 ~ 65,
Each of the remaining intermediate layers located directly below the first intermediate layer has a thickness of 1.3 to 15 mm, a hardness (unit: shore D) of 30 to 70,
The length of the radius of the center portion is 5-18mm, the hardness (unit: shore D) is 30-70,
The moment of inertia of the golf ball is a golf ball, characterized in that less than 83 g · cm 2. The method of claim 1,
The outer layer is made of ionomer resin,
The ionomer resin,
A mono-olefin containing at least a portion of an unsaturated carbonic acid having 3 to 8 carbon atoms and an ester of the carbonic acid, and at least partially neutralized with a monovalent or divalent metal. Golf ball, characterized in that the ionomer resin. The method of claim 1,
The outer layer,
A polyurethane comprising at least one of an ester type polyurethane, an ether type polyurethane, and an ether ester copolymer type polyurethane,
A golf ball made of a polyurethane elastomer made by polymerizing a polyol with diisocyanate and a chain extender, or a two-component polyurethane used by mixing polyol and polyisocyanate with each other during molding. The method of claim 1,
The first intermediate layer is made of an ionomer resin,
The ionomer resin,
A mono-olefin containing at least a portion of an unsaturated carbonic acid having 3 to 8 carbon atoms and an ester of the carbonic acid, and at least partially neutralized with a monovalent or divalent metal. Golf ball, characterized in that the ionomer resin.

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