CN102371053A

CN102371053A - Golf ball having high initial velocity

Info

Publication number: CN102371053A
Application number: CN2011102405795A
Authority: CN
Inventors: 亚瑟·莫里纳瑞
Original assignee: Nike International Ltd
Current assignee: Nike Innovation LP
Priority date: 2010-08-20
Filing date: 2011-08-19
Publication date: 2012-03-14
Anticipated expiration: 2031-08-19
Also published as: EP2420297A2; KR101211295B1; TWI457160B; EP2420297A3; JP2012040383A; AU2011213701B2; EP2420297B1; CN202654631U; US20120064998A1; JP5779445B2; KR20120018099A; TW201223594A; AU2011213701A1; CN102371053B

Abstract

The present invention relates to a golf ball having a high initial velocity. A multi-layer ball includes a core made of a high energy material such as a highly neutralized polymer and a cover made of a deadening material. A specified relationship exists between the compression and coefficient of restitution of the core and of the ball. The initial velocity of the ball is higher than what would be expected based on the coefficient of restitution of the ball compared to prior balls. The use of the deadening material allows the coefficient of restitution of the ball to be relatively low, which can yield improved spinnability in the half wedge shots while maintaining driver distance.

Description

Golf with high initial velocity

Technical field

Present invention relates in general to a kind of golf with multilayer.Said layer is designed with the specific coefficient of resilience and the degree of compression concerns so that obtain high initial velocity.

Background technology

The golf that production has multilayer is general in industry.Each designer in the industry can feel that some aspect ratio further feature is more important, and can design golf and optimize some characteristic.Each linksman also can feel the more important or needs more of some aspect ratio further feature.

Under many circumstances, the linksman need provide the long as far as possible golf that hits distance.Hit length and controlled by the factor beyond a lot of linksmans, as on the relative altitude of service platform and alley, the alley or near the barrier the alley, wind speed, weather etc.Hit length and receive linksman's parameter control that swings equally, like his or her club head speed, his or her level and he or she selects the club that uses for special hitting.Hit length and also receive the control that ball leaves long initial velocity when hitting bar.

In other cases, in the quarter butt match, the linksman needs golf to have rotation/rotatory that good feel is become reconciled when impacting.The feel of golf is formed the control of the material of top layer or layer usually.The selection of layer material also can be based on durability, wearability, color etc.

Many linksmans need the length of ball running orbit and the balance between player's sense.Although some linksmans only need one or another characteristic, the linksman more possibly need the balance of these characteristics.

Therefore, need exploitation to comprise the golf of the good feel and the combination of the characteristic of the initial velocity of maximum.It is needed when playing golf that the combination of these characteristics is commonly referred to be the linksman.

Summary of the invention

Among the embodiment a kind of golf is provided.Said golf can have the ball core and be centered around ball core top layer on every side.The ball core can comprise the highly polymer of neutralization.The top layer can comprise padded coaming (deadening material).The ball core can have first coefficient of resilience and ball has second coefficient of resilience.The difference of said first coefficient of resilience and second coefficient of resilience is approximately less than 0.032.

A kind of golf is provided among another embodiment.Said golf can have to be had the ball core and is centered around ball core top layer on every side.Said ball core has degree of compression x.The coefficient of resilience of ball can pass through equality 6511-0.024x ²+ 0.1165x draws.The coefficient of resilience of ball core can pass through equality 0.7951-0.0121x ²+ 0.416x draws.Can be used as the upper limit according to the coefficient of resilience of any ball of this Trendline preparation and produce standard compliant ball.Use padded coaming can allow the designer to use high energy ball core to produce standard compliant ball as the top layer.

Golf can be designed to have particular kind of relationship between the degree of compression, the coefficient of resilience and the initial velocity.The ball core material and the ball core coefficient of resilience can be designed to produce the ball initial velocity that is higher than expection and/or the rotatory of ball.The ball core material and the ball core degree of compression can be designed to produce the coefficient of resilience that ball is different from expection as a whole.Particularly, ball prepared in accordance with the present invention is tending towards having the initial velocity higher than expection under the given coefficient of resilience.This means because the low coefficient of resilience in the quarter butt match, when especially half wedge impacts, the linksman can have enough initial velocities obtain good hit distance in rotatory increase.

In the ball core, contain high energy material, as highly the neutralization polymer, and contain in the top layer buffering or damping material, like thermoplastic polyurethane (polyurethane), ball can realize these beneficial effects.Ball with high energy ball core can offer the designer more the multilist layer select to obtain required ball performance parameter.

Through figs and detailed explanation, to those skilled in the art, other system, method, the feature and advantage of embodiment can be or can become obvious.This specification attempts to comprise within the scope of the present invention the other system of all that, method, feature and advantage, and makes it receive the protection of said claim.

Description of drawings

With reference to attached drawings and explanation, can understand the present invention better.Inscape in the accompanying drawing is not necessarily drawn in proportion, but emphasis is used to explain principle of the present invention.And in different views, similarly Reference numeral indicates corresponding part.

Fig. 1 is the side view according to golf of the present invention;

Fig. 2 is the cutaway view according to an embodiment of ball of the present invention;

Fig. 3 is the cutaway view according to another embodiment of ball of the present invention;

Fig. 4 is the cutaway view according to another embodiment of ball of the present invention;

The chart of the initial velocity when Fig. 5 hits the bar test for utilizing length and the coefficient of resilience contrast of ball;

Fig. 6 is the coefficient of resilience of two balls and corresponding ball core thereof and the chart of degree of compression contrast; And

Fig. 7 is the chart of the different Trendline of the different ball cores in the

presentation graphs

5 and 6.

The specific embodiment

The invention discloses a kind of polytrope.Be limited to golf although embodiment discusses here, the object of the invention is not limited thereto.Technology described herein can be used for any layered articles, especially projectile, ball, amusement equipment or its assembly.

Fig. 1 is can be according to the side view of the disclosed technological ball of making 100 of the present invention.Fig. 1-4 is illustrated in the general pits pattern of using on the surface 102 of ball 100.Although the pit pattern on the ball 100 can have influence on the flight path of ball 100, concrete pit pattern is not crucial for the use of disclosed embodiment.The designer can select any suitable pit pattern to be applied to ball 100.

Fig. 2 is the cutaway view of first embodiment of the ball 100 among Fig. 1 along line 2-2.As shown in Figure 2, ball 200 can have two layers.Ball 200 can comprise ball core 204 and be centered around ball core 204 top layer 206 on every side.The embodiment of any golf described herein can be according to prior art for preparing; Like compression and/or injection mo(u)lding ball core; Any skin of injection mo(u)lding; Selectively adopt adhesive that the layer of golf is bonded together, and adopt and carry out painted to ball or coating like spraying, brush, dip-dye and trans-printing

Ball core 204 can be by the high energy efficiency material preparation.The high energy efficiency material is a kind of material of colliding with elastomeric mode of being tending towards.In certain embodiments, ball core 204 can be mainly or fully by the polymer manufacture that highly neutralizes.In certain embodiments, highly the polymer of neutralization can be the HPF1000 or the HPF2000 that can buy from E.I. E.I.Du Pont Company (E.I.DuPont de Nemours and Company).In certain embodiments, ball core 204 can have between 38 and 41mm between diameter.In certain embodiments, top layer 206 can be by low efficiency or padded coaming preparation.Low efficiency material is a kind of material of colliding with the mode of low elasticity of being tending towards.In certain embodiments, top layer 206 can mainly or fully be prepared by TPU (urethane resin).In certain embodiments, top layer 206 can have the thickness of 2.1mm at least.

Among some embodiment, can comprise one or more extra skins, but in Fig. 2 or other any accompanying drawings, not represent.The outside on the top layer 206 among Fig. 2 can be a Topcoating.Topcoating can be the coating that is used to improve or adjust ball 200 outward appearances.For example, Topcoating can be used for changing the color of ball 200 or changes the glossiness of ball 200.In another embodiment, extra coating can be to identify the form setting of (logo) or other traces on the outer surface 202 of ball 200.Other extra coating can also be arranged on the outside on top layer 206.It will be understood by those skilled in the art that such external skin can be applicable to any described embodiment, therefore, this optional coating will can further not described in following embodiment.It should be noted that golf has coating usually.All test ball that the application discussed have coating, like coating and protective finish.Although coating has certain influence to the coefficient of resilience of ball; But can believe that this influence is inappreciable to present embodiment; But; If coating is enough thick or is formed by very hard or very soft material, this influences for maybe be very obvious for the purpose of design of embodiment disclosed by the invention.

Fig. 3 is the cutaway view of second embodiment of the ball 100 among Fig. 1 along line 2-2.As shown in Figure 3, ball 300 can have three layers.Ball 300 can comprise ball core 304, is centered around ball core 304 endosexine 308 on every side, and centers on the extexine 310 around the endosexine 308.

Ball core 304 can be by the high energy efficiency material preparation.In certain embodiments, ball core 304 is main or complete by the polymer manufacture that highly neutralizes.In certain embodiments, highly the polymer of neutralization can be the HPF1000 or the HPF2000 that can buy from E.I. E.I.Du Pont Company (E.I.DuPont de Nemours and Company).Ball core 304 can have between 38 and 41mm between diameter.In certain embodiments, any layer outside the skim-coat can comprise the highly ionomer of neutralization.In certain embodiments, all layers outside the skim-coat can be gathered between about 38mm to the size between the 41mm.In certain embodiments, all layers outside the skim-coat can be assembled written treaty 38.6mm.

In certain embodiments, endosexine 308 can be formed by material preparation one or more low efficiencies or buffering with extexine 310.In certain embodiments, endosexine 308, extexine 310 or this two can mainly or fully form by TPU or thermoplastic polyurethane resins.In other embodiments, endosexine 308, extexine 310 or this two can mainly or fully be prepared from ionomer resin.In certain embodiments; Ionomer resin can be

that can buy from E.I. E.I.Du Pont Company (E.I.DuPont de Nemours and Company) in certain embodiments, the combination thickness of endosexine 308 and extexine 310 is about 2.1mm.

Fig. 4 is the cutaway view of second embodiment of the ball 100 among Fig. 1 along line 2-2.As shown in Figure 4, ball 400 has four layers.Ground floor 412 can be the endosphere sandwich layer.The second layer 414 can be the ectosphere sandwich layer and can be centered around around the ground floor 412.Can be the endosexine for the 3rd layer 416 and can be centered around around the second layer 412.Can be extexine for the 4th layer 418 and be centered around around the 3rd layer 416.First or endosphere sandwich layer 412 and second or ectosphere sandwich layer 414 can be regarded as and be called ball core 420 together.The 3rd or endosexine 416 and the 4th or extexine 418 can be regarded as and be called top layer 422 together.

Ball core 420 can be formed by one or more efficient material preparations, and each layer of the ground floor 412 and the second layer 414 can be processed by different efficient material prescriptions.In certain embodiments, one deck at least of ball core 420 can mainly or fully be formed by the polymer manufacture that highly neutralizes.In certain embodiments, highly the polymer of neutralization can be the HPF1000 or the HPF2000 that can buy from E.I. E.I.Du Pont Company (E.I.DuPont de Nemoursand Company).Top layer 422 can be by forming than material preparation poor efficiency or buffering.In certain embodiments, the 3rd layer 416, the 4th layers 418 or this two can mainly or fully form fully by made from thermoplastic polyurethane resin.In other embodiments, the 3rd layer 416, the 4th layers 418 or this two can mainly or fully be prepared from ionomer resin.In certain embodiments; Ionomer resin can be

that can buy from E.I. E.I.Du Pont Company (E.I.DuPont de Nemoursand Company) in certain embodiments, the combination thickness of endosexine 416 and extexine 418 is about 2.1mm.In certain embodiments, any layer outside the skim-coat can comprise the highly ionomer of neutralization.In certain embodiments, all layers outside the skim-coat can be gathered between about 38mm to the size between the 41mm.In certain embodiments, the layer of all outside the skim-coat can be assembled written treaty 38.6mm.

Among Fig. 4, ball 400 is described and is illustrated as having a plurality of layers.In certain embodiments, can add extra layer.For example, in certain embodiments, can between ball core 420 and top layer 422, add cover layer.In other embodiments, can between endosexine 416 and extexine 418, insert middle top layer.In other embodiments, can between endosphere sandwich layer 412 and ectosphere sandwich layer 414, insert the intermediate sandwich layer.

According to designer's concrete needs and on purpose basis without departing from this embodiment, be conspicuous for the person of ordinary skill of the art to the similar modification of any embodiment.For example, four layers of ball can comprise endosphere sandwich layer, intermediate sandwich layer, ectosphere sandwich layer and independent top layer.Likewise, four layers of ball can comprise independent ball sandwich layer and endosexine, middle top layer and extexine.Ball with other intermediate layer number also is conspicuous for the person of ordinary skill of the art.Therefore, illustrated embodiment comes down to exemplary, but not is used for restriction.

Fig. 5 is discussed now, and Fig. 5 representes the chart of the difference between embodiments of the invention and the at present commercially available ball.Be described in more detail below these balls.Numerical value on the Y axle of the left side is the initial velocity of ball when hitting the bar test with length.Each ball adopts down at the same terms (bar head speed, impact angle etc.) that the Nike SQ of 9.5 lofts is long to be hit bar and impact.

Represent initial velocity through the height of each bar shaped on the bar chart among the figure.Initial velocity is represented with miles per hour shown in the bar chart.Initial velocity 150 miles per hours approximate 220 feet per seconds.About 170 miles per hours of initial velocity approximate 250 feet per seconds.

The numeric representation ball on the right is made the as a whole coefficient of resilience in the chart.In order to measure the coefficient of resilience of object, with the initial velocity ejaculation object of air bubble with about 40 metre per second (m/s)s.Steel plate is positioned at apart from about 1.2 meters of big gun, about 0.6 to 0.9 meter apart from big gun in speed monitoring device.Object is penetrated by air bubble, and through the speed monitoring device, to confirm initial velocity.Afterwards, object strikes and is rebounded through the speed monitoring device to steel plate, to confirm return speed.The coefficient of resilience is the ratio of return speed and initial velocity.The coefficient of resilience of each ball is by 544 expressions of the line in the chart.

The X axle is represented test ball.Each test ball test initial velocity and coefficient of resilience.Preceding 9 balls (label 1-9) are commercially available golf.These balls all have the ball core that is about 40mm by the diameter of butadiene rubber compound.For each ball, the definite prescription of ball core is slightly different.The ball core of each ball is prepared to have the different compression degree and the coefficient of resilience the butadiene rubber with different additive or different size.It is believed that to have association between the coefficient of resilience and the ball core size, possibly be very strong association, so the minor variations of ball core size can be brought very important influence to the coefficient of resilience.The about 1.4mm in the top layer of each ball is thick and mainly prepared by

.

On the other hand, the ball of label 10 is the balls according to embodiment of the invention preparation.Be different from preceding 9 balls, the ball of label 10 has the diameter of mainly being processed by the fluoropolymer resin of highly neutralization to be about the ball core of 38mm.The diameter of ball core can arrive about 41mm greatly.About 2.1mm is thick on the top layer of ball, but can be as small as the thickness of about 0.9mm.If desired, can also comprise cover layer, meet the USGA minimum dimension regulation of 42.67mm (1.680 feet) to guarantee ball.

During the concerning of contrast initial velocity and the coefficient of resilience, it should be noted, for ball 1-9, population interconnection between the coefficient of resilience and the initial velocity.For example, for

ball

1,2,4 and 5, its coefficient of resilience is less than 0.795, and initial velocity drops to and is lower than about 150.2.For

ball

3,6,7 and 8, its coefficient of resilience is greater than 0.800, and initial velocity is greater than about 150.8.For ball 9, its coefficient of resilience is about 0.800, and initial velocity is about 150.8.Therefore, a kind of population interconnection between the graphical presentation coefficient of resilience and the initial velocity.

But chart display ball 10 initial velocities shown in Figure 5 depart from the expection initial velocity of traditional ball, and its coefficient of resilience is 0.774.For ball 10, coefficient of resilience value is about 0.774.Be different from by the initial velocity below 150 miles per hours of traditional ball 1-9 prediction, the initial velocity of ball 10 still keeps 150.8, and itself and the coefficient of resilience are far above the initial velocity of the ball of ball 10 much at one.Therefore, through adopting above-mentioned spherical structure, quarter butt can keep relatively low better feel and the rotatory of obtaining than the coefficient of resilience of ball in play, keeps sufficiently high initial velocity simultaneously and obtains long remote when hitting bar and impacting.

This impacts particular importance for half wedge.Have the ball of the low coefficient of resilience, the linksman often more firmly impacts ball, for example, adopts higher bar head speed, obtains the distance identical with the ball with higher coefficient of resilience.More firmly impact (bar head speed bigger), the rotation of giving ball the more.Therefore, the linksman can make the lower ball of the coefficient of resilience that good initial velocity is arranged and hit distance, but in the quarter butt match, has increased rotatory.

The additional features that can between existing ball and ball disclosed by the invention, contrast can be referring to Fig. 6.Fig. 6 is the different balls of expression and the degree of compression of ball core and the chart of the relation between the coefficient of resilience.The degree of compression of the endosphere sandwich layer of the value representation ball on the X axle.The degree of compression is through the mensuration of mode well known in the art.Spherical ball core and/or ball place under the initial load 10KG.On one or more points, for example on limit, seam or point at random, measure the measured value of bulb diameter, usually in millimeter.Write down single value or mean value.Load is increased to 130KG, on same point, measures second measured value of bulb diameter, still in millimeter.Write down single value or mean value under the heavy load more.Difference between record value is the degree of compression, in millimeter.

The coefficient of resilience of four kinds of situation that the value representation on the Y axle is considered.Line 650 expression diameters are about 38mm and by the degree of compression of the ball core of butadiene rubber compound and the relation between the coefficient of resilience.The Trendline equality of this ball core is expressed from the next

Y=0.7531-0.0128x ²+ 0.055x equality 1

Wherein x representes the inner spherical core degree of compression, and y representes the corresponding coefficient of resilience.

The degree of compression of line 660 expression balls and the relation between the coefficient of resilience, said bag is drawn together the top layer that covers the ball core shown in the line 650.The equality of this Trendline is expressed from the next

Y=0.6794-0.0179x ²+ 0.0831x equality 2

Wherein x representes the ball core degree of compression, and y representes the coefficient of resilience of ball as a whole.The difference of the relative coefficient of resilience of ball core and the coefficient of resilience of ball arrives between about 0.037 the scope between about 0.035.

But, comprise main or reveal tangible difference by the contrast table of the relative coefficient of resilience of the ball of the ball core of the polymer manufacture that highly neutralizes fully.Line 670 expression diameters are about 38mm and main or fully by the degree of compression of the ball core of the polymer manufacture that highly neutralizes and the relation between the coefficient of resilience.The equality of this Trendline is expressed from the next

Y=0.7951-0.0121x ²+ 0.0416x equality 3

Wherein x representes the ball core degree of compression, and y representes the corresponding coefficient of resilience.

The degree of compression of line 680 expression balls and the relation between the coefficient of resilience, said bag is drawn together the top layer that covers the ball core shown in the line 670.Said top layer has identical surface structure with the top layer of the ball shown in the line 650.The equality of this Trendline is expressed from the next

Y=0.6511-0.024x ²+ 0.1165x equality 4

Wherein x representes the ball core degree of compression, and y representes the coefficient of resilience of ball as a whole.The difference of the relative coefficient of resilience of ball core and the coefficient of resilience of ball is between about scope of 0.026 to 0.031.

Therefore, show clearly that for the given inner spherical core degree of compression, the ball with ball core is compared with the ball with HNP ball core has the lower coefficient of resilience like Fig. 6.Likewise, in order to obtain the optimum efficiency of padded coaming, the difference of the coefficient of resilience of ball core and the coefficient of resilience of ball is at least 0.026, but can significantly increase, as 0.037,0.05,0.1 or higher.The coefficient of resilience of ball is lower, and ball more is prone to rotation, thus need have the ball of the difference of the higher coefficient of resilience, as at least 0.037 or 0.05.The high relatively coefficient of resilience of above-mentioned ball core prepared in accordance with the present invention allows when the option table layer material, very big flexibility is arranged, because the coefficient of resilience of ball when padded coaming is provided as a whole still can be in the scope of optimum performance.

These beneficial effects are expression more simply in Fig. 7, and wherein for the given coefficient of resilience, ball core Trendline 762 is compared with HNP ball core Trendline 760 and shown the lower all the time ball core degree of compression.HNP ball core Trendline 764 (Trendline with complete ball of NHP ball core) as a reference.

Therefore, replacing the ball core with identical specific coefficient of resilience with the resin balls core with specific coefficient of resilience allows the relative coefficient of resilience of ball and ball core to have very big-difference.Especially the coefficient of resilience that surpasses the coefficient of resilience that ball core Trendline provides and said ball when the coefficient of resilience of resin balls core is during less than the given coefficient of resilience of following equality

Y=-0.0103x+0.8419 equality 5

Wherein y representes the coefficient of resilience, and x representes the inner spherical core degree of compression.

This usually can be through being realized by at least one inside of the ionomer/polymer manufacture/non-top layer of highly neutralization.Top layer character need not change between the polymer drops core of butadiene rubber ball core and highly neutralization.But when using the polymer drops core of highly neutralization, the difference of the coefficient of resilience of ball core and ball is at least about 0.004.This ball that allows to have the higher coefficient of resilience is by identical skin-material preparation.

When following the above-mentioned polymer drops core that is used for highly neutralization and during by the coefficient of resilience Trendline of the ball of the polymer drops core preparation of highly neutralization, possibly needing in accordance with other restrictions.For example, qualified ball has the coefficient of resilience less than the given trend of equality 5, perhaps more conservatively, has the coefficient of resilience of the trend that provides less than following equality

Y=-0.0103x+0.8299 equality 6

Wherein y representes the coefficient of resilience, and x representes the inner spherical core degree of compression.Therefore, the designer possibly need to give the fixed upper limit of the coefficient of resilience of the ball of following equality 4, so that the coefficient of resilience can not exceed the coefficient of resilience that equality 6 provides.

Can believe that the ball that is prepared by above-mentioned disclosure has the character of improvement.Can believe that said ball compares with expection and have higher initial velocity.Said ball also can allow to adopt a greater variety of skin-materials, especially comprises the material of those lower costs.Compare with other balls, said ball can be the linksman and provides than long running track and the lower ball of cost.

Optional layered articles structure also possibly strengthen these beneficial effects.For example; Can according to instruction of the present invention and the applying date be Augusts 20 in 2010 day, be called " golf (Golf Ball Having Layers with Specified Moduli andHardnesses) " with layer of regulation modulus and hardness, application number is 12/860; Goods described in 785 the U.S. Patent application are made golf, and the full content of this patent application is to be incorporated into this with reference to the mode of quoting.

Although described various embodiment of the present invention; But specification is intended to as example; Rather than restriction, and for this area those skilled in the art, it is conspicuous that more embodiment and embodiment can also be arranged in the scope of the invention.Therefore, the present invention only receives the restriction of claim.In addition, in the claim scope, can make various changes and conversion.

Claims

1. a ball is characterized in that, comprises:

Contain the highly ball core of the polymer of neutralization; And

The top layer of containing padded coaming, wherein said top layer are arranged on the radial outside of said ball core and surround said ball core;

Wherein the ball core has first coefficient of resilience and ball has second coefficient of resilience; And

Wherein the difference of first coefficient of resilience and second coefficient of resilience is approximately greater than 0.026.

2. ball according to claim 1 is characterized in that, said first coefficient of resilience is greater than 0.78.

3. ball according to claim 1 is characterized in that, said second coefficient of resilience is less than 0.79.

4. ball according to claim 3 is characterized in that, said second coefficient of resilience is about 0.774.

5. ball according to claim 1 is characterized in that, said ball core has two-layer at least, and one deck comprises highly the polymer of neutralization at least, and top layer wherein has two-layerly at least, and one deck comprises thermoplastic polyurethane at least.

6. ball according to claim 1 is characterized in that, said ball is compared with the ball core ball with similar in fact non-ball sandwich layer has higher initial velocity.

7. a ball is characterized in that, comprises:

Ball core with degree of compression " x "; And

Be centered around ball core top layer on every side;

Wherein the coefficient of resilience of ball is by formula: 0.6511-0.024x ²+ 0.1165x provides; And

Wherein the coefficient of resilience of ball core is by formula: 0.7951-0.0121x ²+ 0.416x provides.

8. ball according to claim 7 is characterized in that the coefficient of resilience of said ball core is greater than 0.78.

9. ball according to claim 7 is characterized in that the coefficient of resilience of said ball is less than 0.79.

10. ball according to claim 7 is characterized in that, said ball core has one deck at least and comprises the highly layer of the polymer of neutralization.

11. ball according to claim 7 is characterized in that, said top layer has the layer that one deck at least comprises thermoplastic polyurethane.

12. ball according to claim 7 is characterized in that, the coefficient of resilience of ball is less than the given coefficient of resilience of formula :-0.0103x+0.8419.

13. a ball is characterized in that, comprises:

Contain one or more layers ball core;

Contain one or more layers top layer, wherein said top layer is positioned at the radial outside of said ball core and surrounds said ball core;

Wherein said ball core has the diameter of 38mm at least;

Wherein the ball sandwich layer comprises the highly ionomer of neutralization at least; And

The coefficient of resilience of wherein said ball core is greater than the coefficient of resilience of ball core Trendline, and wherein the coefficient of resilience of ball core Trendline passes through equality: y=-0.0128x ²+ 0.055x+0.7531 provides, wherein " y " expression coefficient of resilience, and " x " expression inner spherical core degree of compression.

14. ball according to claim 13 is characterized in that, said ball is compared with the ball core ball with similar in fact non-ball sandwich layer has higher initial velocity.

15. ball according to claim 13 is characterized in that, the coefficient of resilience that the coefficient of resilience of said ball provides less than equality: y=-0.0103x+0.8419.

16. ball according to claim 13 is characterized in that, said ball core comprises the highly polymer of neutralization.

17. ball according to claim 16 is characterized in that, said top layer comprises thermoplastic polyurethane.

18. ball according to claim 13 is characterized in that, said ball core is made up of two-layer, and wherein one deck is made up of the polymer that highly neutralizes at least.

19. ball according to claim 13 is characterized in that, said top layer is made up of two-layer, and wherein one deck is made up of thermoplastic polyurethane at least.

20. ball according to claim 13 is characterized in that, the coefficient of resilience that the coefficient of resilience of said ball provides less than equality: y=-0.0103x+0.8299.