CA1195710A - Golf ball and method of making the same - Google Patents

Golf ball and method of making the same

Info

Publication number
CA1195710A
CA1195710A CA000410140A CA410140A CA1195710A CA 1195710 A CA1195710 A CA 1195710A CA 000410140 A CA000410140 A CA 000410140A CA 410140 A CA410140 A CA 410140A CA 1195710 A CA1195710 A CA 1195710A
Authority
CA
Canada
Prior art keywords
layer
core
golf ball
flexural modulus
hard
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CA000410140A
Other languages
French (fr)
Inventor
R. Dennis Nesbitt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Top Flite Golf Co
Original Assignee
R. Dennis Nesbitt
Questor Corporation
Spalding Holdings Corporation
Lisco, Inc.
Spalding Sports Worldwide, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by R. Dennis Nesbitt, Questor Corporation, Spalding Holdings Corporation, Lisco, Inc., Spalding Sports Worldwide, Inc. filed Critical R. Dennis Nesbitt
Application granted granted Critical
Publication of CA1195710A publication Critical patent/CA1195710A/en
Expired legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • A63B37/0023—Covers
    • A63B37/0024—Materials other than ionomers or polyurethane
    • A63B37/0026—Balata
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • A63B37/0023—Covers
    • A63B37/0029—Physical properties
    • A63B37/0033—Thickness
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • A63B37/0038—Intermediate layers, e.g. inner cover, outer core, mantle
    • A63B37/004—Physical properties
    • A63B37/0041—Coefficient of restitution
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • A63B37/0038—Intermediate layers, e.g. inner cover, outer core, mantle
    • A63B37/004—Physical properties
    • A63B37/0045—Thickness
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • A63B37/0038—Intermediate layers, e.g. inner cover, outer core, mantle
    • A63B37/004—Physical properties
    • A63B37/0049—Flexural modulus; Bending stiffness
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • A63B37/005—Cores
    • A63B37/006—Physical properties
    • A63B37/0061—Coefficient of restitution
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • A63B37/007—Characteristics of the ball as a whole
    • A63B37/0072—Characteristics of the ball as a whole with a specified number of layers
    • A63B37/0075—Three piece balls, i.e. cover, intermediate layer and core
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • A63B37/007—Characteristics of the ball as a whole
    • A63B37/0077—Physical properties
    • A63B37/0078—Coefficient of restitution
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • A63B37/007—Characteristics of the ball as a whole
    • A63B37/0077—Physical properties
    • A63B37/008—Diameter
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • A63B37/007—Characteristics of the ball as a whole
    • A63B37/0077—Physical properties
    • A63B37/0083—Weight; Mass
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • A63B37/007—Characteristics of the ball as a whole
    • A63B37/0077—Physical properties
    • A63B37/0084—Initial velocity
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S273/00—Amusement devices: games
    • Y10S273/22—Ionomer

Abstract

ABSTRACT

The disclosure embraces a golf ball and method of making same wherein the golf ball has a solid resilient center or core, and a multilayer cover construction which involves a first layer or ply of molded hard, high flexural modulus resinous material on the core, and a second or cover layer of soft, low flexural modulus resinous material molded over the first layer to form a finished golf ball.

Description

:~g5~LO
S P E C I F I C A T I O N

TECHNICAL FIELD
The invention relates to a golf ball and more particularly to a cover construction for a golf ball.
~ACK~ROUND ~RT
Golf balls having a cover material marketed under the trademark "Surl~" by E.I. du Pont de Nemours and Company of Wilmlngton, Delaware, are known in the art and such cover compositions generally comprise a copolymer of an olefin and at least one unsaturated monocarboxylic acid. Conventional two-piece golf balls are comprised of a solid resilient center or core with molded Surlyn covers. The cover used is normally a hard, high Elexural modulus Surlyn resin in order to produce ~0 a gain in the coefficient of restitution over that of the center or core.
In a conventional two-piece golf ball, a hard, high flexural modulus Surlyn resin is molded over a resilient - center or core. The hard, highly flexural modulus Sur~yn resin for the cover of a -two-piece golf ball is desirable as it develops the greatest hoop stress and consequently the great-est coefficient of restitution.
A two-piece golf ball having a hard, Surlyn resin cover however does not have the "feel" or playing characteristics associated with softer balata covered golf balls. Heretofore balata covered golf balls have been preferred by most golf professionals. If a golf ball has a cover of soft, low fle~-ural modulus Surlyn resin molded directl~ over a center or core it is found that little or no gain in coefficient of restitution is obtained.

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o DISCLOSURE ()F T~IE INVENTION
In accordance with -tlle ~resent invention there is provided a golf ball having a multilayer or two-ply cover con-struction for a solid resilient center or core wherein the multilayer co~7e~ construc-tion involves two stage molded cover compositions over a solid center or core of resilient polymeric material wherein an increased coefficient of restitution is attained and wilerein the "feel" or playing characteristics are attained similar to those derived from a balata covered golf ball.
The invention embraces a golf ball and method of making same wherein the ball has a solid center or core of resilient polymeric or similar material covered by a first layer or ply of molded hard, highly flexural modulus resinous material or of cellular or foam composition which has a high coefficient of restitution.
The first layer or ply is provided with a second or cover layer of a comparatively sof-t,low flexural modulus resinous material or of cellular or foam composition molded over the first layer and core or center assembly. Such golf ball has the "feel" and playing characteristics simulating those of a softer balata covered golf ball.
Through the use of the first ply or layer of hard, high flexural modulus resinous material on the core or center, a maximum coefficient of restitution may be attained. The resinous material for the first ply or layer may be one type of Surlyn marketed by E.~. du Pont de Nemours and Company of Wilmington, Delaware, and the other ply or cover layer may be of a different type of Surlyn resin also marketed by the same company.
The three-piece golf ball of the invention provides a golf ball in which the coefficient of restitution of the golf ball closely approaches or attains that which provides the maximum initial velocity permitted by the United States Golf Association Rules of two hundred fifty feet per second with a maximum tolerance of two percent, which velocity may be readily attained and the playing characteristics or "feel" associated with jrc:~

5~

a balata covered ball secured whlle maint~ining a total ~eigllt of the ~olf ba].l no-t exceedi.ng 1.620 ounces withou~
sacri.ficing any advanta~es of a golf ~all havi.ng a standard Surlyn co~er o~ the prior art or a golf ball having a softer balata cover.
Further objects and advanta~es are within the scope of this invention such as related to the arrangemen-t, operation and function of the related elements of the structure, to various details of construction and to combinations oE parts, elemen-ts per se, and to economies of manufacture and numerous other fea-tures as will be apparent from a consideration of the specification and drawings.
_RIEF DESCRIPTION OF THE DRAWINGS
The details of -the invention will be described in connection with the accompanying drawings in which:
FIGURE 1 is a view of a golf ball embodying the invention illustrating portions of the multiply or multilayer cover construction on a core or center, and FIGURE 2 is a diametrical cross sectional view o the golf ball of the invention.
BEST MODE FOR CARRYING OUT THE INVENTION
Referring to the drawings in detail there is illustrated a golf ball 10 which comprises a solid center or core 12 formed as a solid body of resilient polymeric material or rubber-like material in the shape of a sphere. Disposed on the spherical center or core 12 is a first layer, lamination, ply or inner cover 14 of molded hard, highly flexural modulus resinous material such as type 1605 Surlyn marketed by E.I. du Pont de Nemours and Company, Wilmington, Delaware.
This material of the inner layer 14 being a hard, high flexural modulus resin produces a substantial gain of coefficient of restitution over -the coefficient of restitution o~ the core or center. ~n outer layer, ply, lamination or cover 16 of comparatively soft, low flexural modulus resinous material such as type 1855 Surlyn marketed by E.I. du Pont de Nemours and Company is then re-molded onto the inner ply or layer 14, the outer surface of the outer layer or cover 16 being ,~

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of dimple~ configuratioll providing a finished three-piece golf ball.
According to the Uni-ted States Golf ~ssociation Ru]es, the mini~m diameter prescribecl for a golf ball is 1.6~0 inches and the maximu~ weight prescribed for a golf ball is 1.620 ounces. ~t is therefore desirable to produce a golf ball having an impro~ed coefficien-t of restitution to attain an initial velocity ~or the golf ball approaching the maximum velocity limit of ~55 feet per second, the maximum limit provided by the United States Golf Association Rules.
Th~ hard, high flexural modulus resin is employed to increase ~he coefficient of restitution in order to attain or approach ~he maximum initial velocity for the golf ballD The use of a soft low flexural modulus resin provides little or no gain in the coefficient of restitution and may tend to reduce the coefficient of restitution thereby adversely affect-ing the initial velocity factor.
In producing the golf ball of the invention, the density of the center or core may be varied and the relative thick-nesses of the layers, plies or laminations 14 and 16 may be varied wi~hin limits so that the golf ball weight does not exceed 1.620 ounces, the minimum diameter not less than 1.680 inches, and the ball be capable of an initial velocity approach-ing 255 ~eet per second. However, the finished golf ball may be of 'arge~ Qiameter providing the total weight of the ball does not exceed 1.620 ounces.
Thus, by varying the density of the center or core 12 and varying the thicknesses of the plies or layers 14 and 16 of the cover construction, a golf ball may be produced having a total weight n~ exceeding 1.620 ounces and a minimum diameter of 1.680 inches and having a comparatively high coefficient of restitution, the ball closely approaching or attaining in play the maxir~um permitted initial velocity of 255 feet per second.
In -the golf ball of the invention the thickness of the inner layer or ply 14 and the thickness of the outer layer or ply 16 may be varied to secure the advantages herein mentioned.
It is fou~d that the inner layer 14 of hard, high flexural modulus re~inous material, such as Surlyn resin type 1605, is jrc~

prefera~ of a thick~es~ in a ran~e of .020 inches and .070 inches. The thickness of the outer layer or cover 16 of soft, low flexural modulus resin, such as Surlyn type 1855, may be in a ra~e of .020 inches and .100 inches.
For example, a center or core 12 having a .770 coefficient of restitution is molded with a layer of hard, high modulus Surlyn r~sin, such as Surlyn type 1605, to form a spherical body of a diameter of about 1.565 inches. This spherical body comprisi~g the core or center 12 and layer 1~ of the hard, high modulus Surlyn resin has a coefficient of restitution of .800 or more.
This center or core 12 and inner layer 14 of hard resinous material in the form of a sphere is then re-mo]ded into a ~mpled golf ball of a diameter of 1.680 inches minimum with an outer or cover layer 16 of a soft, low flexural modulus resin su~ as Surlyn type 1855. The outer layer of the soft resin is of a thickness of .0575 ~nches. The soft Surlyn resin cover w~uld have about the same thickness and shore hardness of a balata covered golf ball and would have the advantageous "feel"
and playing characteristics of a balata covered golf bali.
~t is to be understood that the golf ball of the invention may be made of a diameter greater than 1.680 inches withou~ exceeding the total weight of 1.620 ounces by varying the thickness of the inner layer or ply 14 and the outer cover layer o~ pl~- 16 and secure desired "feel" and playing characteristics.
T~ inner, intermediate, or first layer or ply 14 and the outer c~r, second layer or ply 16 or either of the layers may, be cell~lar when formed of a foamed natural or synthetic polymeric material. Polymeric materials are preferable such as ionomer resins which are foamable. Reference is made to the applica~ion, Serial Number 155,658, of Robert P. Molitor issued into pa~ent 4,274,637 which describes a number of foamable composi~ions of a character which may be employed for one or both layers 14 and 16 for the goIf ball of this invention~
The inner, intermediate or first layer 14 on the core 12 may ~e preferably partially or only slightly foamed to a low degree so as not to materially affect the coefficient of 5 _ jrc:i~

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restitution of the material The outer or cover layer or second l~yer 16 may be foamed to a greater degree -than the inner, i~termeciate or first layer 1~ as the material of the layer 16 is compara-tively soft.
Th~ inner, intermediate or first layer 14 may be unfoamed or noncellular and the outer layer may be cellul.ar or foamed resin. If certain characteristics are desired for the golf ball, t~e inner layer 14 may be slightly or partially foamed and the outer or cover layer or ply 16 may be of unfoamed or noncellular material.
Thr~ugh the use of Eoamable material Eor the first layer, the cov~r layer or both layers, the degree of foaming of one or the ~-~her or hoth layers may be altered to provide a variati~n in the coefficient of restitution of the golf ball.
~ t .is apparent that, within the scope of the invention, modifications and different arrangements may be made other than as; herein disclosed, and the present disclosure is illustr~tive merely~ the invention comprehending all variati~ns thereof.

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Claims (14)

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A golf ball comprising a spherically-shaped core of resilient material, a first layer of hard, high flexural modulus resinous material molded onto the core, and a cover layer of soft, low flexural modulus resinous material molded over the first layer of resinous material on the core, the total weight of the golf ball not exceeding 1.620 ounces.
2. A golf ball comprising a spherically-shaped core of resilient solid material, a first layer of hard, high flexural modulus resinous material molded onto the core, and a second layer of soft, low flexural modulus resinous material molded over the first layer of resinous material on the core, the total weight of the golf ball not exceeding 1.620 ounces.
3. A golf ball comprising a spherically-shaped core of resilient solid material, a layer of comparatively hard, high flexural modulus resinous material molded onto the core, the exterior surface of the layer being of spherical configuration, and a cover layer of comparatively soft, low flexural modulus resinous material molded over the layer of hard, high flexural modulus resinous material, the outer surface of the cover layer being of dimpled configuration, the total weight of the golf ball not exceeding 1.620 ounces.
4. A golf ball comprising a spherically-shaped core of resilient solid material, a hard, high flexural modulus resinous material molded onto the core forming a layer on the core, a soft-low flexural modulus resinous material molded over the layer of high flexural modulus resinous material providing a cover layer of generally spherical shape, the exterior surface of said cover layer being of dimpled configuration, the total weight of the golf ball not exceeding 1.620 ounces, and the diameter of the golf ball being not less than 1.680 inches.
5. A golf ball according to claim 4 wherein the layer of hard, high flexural modulus resinous material is of a thick-ness in a range of .020 inches and .070 inches.
6. A golf ball according to claim 4 wherein the cover layer of soft, low flexural modulus resinous material is of a thick-ness in a range of .020 inches and .100 inches.
7. A three-piece golf ball comprising a spherically-shaped core of resilient solid material, a comparatively hard, high flexural modulus resinous material molded onto the core form-ing a layer of the hard, high flexural modulus resinous mater-ial on the core, and a comparatively soft, low flexural modu-lus resinous material molded onto the layer of hard, high flexural modulus resin forming a cover layer, the exterior surface of the cover layer being of dimpled configuration and generally of spherical shape, the total weight of the golf ball not exceeding 1.620 ounces, and the diameter of the golf ball being not less than 1.680 inches.
8. A three-piece golf ball comprising a spherically-shaped core of resilient solid material, a hard, high flexural modu-lus surlyn resin molded onto the core forming a first layer of spherical configuration on the core, a soft, low flexural modu-lus surlyn resin molded over the first layer of hard, high flexural modulus surlyn resin to form a cover layer of spherical configuration, the exterior surface of the cover layer being of dimpled configuration, and the total weight of the golf ball not exceeding 1.620 ounces.
9. A golf ball comprising a spherically-shaped core of resilient material, a first layer of hard, high flexural modulus resinous material molded onto the core, and a cover layer of soft, low flexural modulus resinous foamable material molded over the first layer of resinous material on the core, said cover layer being foamed to a cellular condition, the total weight of the ball not exceeding 1.620 ounces.
10. A golf ball comprising a spherically-shaped core of resilient material, a first layer of hard, high flexural modulus resinous foamable material molded onto the core, said first layer being foamed to a cellular condition, and a cover layer of soft, low flexural modulus resinous material molded over the first layer of resinous foamable material on the core, the total weight of the ball not exceeding 1.620 ounces.
11. A golf ball comprising a spherically-shaped core of resilient material, a first layer of hard, high flexural modulus resinous foamable material molded onto the core, said first layer being foamed to a cellular condition, and a cover layer of soft, low flexural modulus resinous foamable material molded over the first layer of resinous material, said cover layer being foamed to a cellular condition, the total weight of the ball not exceeding 1.620 ounces.
12. A golf ball comprising a spherically-shaped core of resilient material, a first layer of hard, high flexural modulus resinous foamable material molded onto the core, a cover layer of soft, low flexural modulus resinous foamable material molded over the first layer of resinous foamable material on the core, said first layer and said cover layer being foamed to a cellular condition, said first layer being foamed to a lesser degree than that of the cover layer, the total weight of the ball not exceed-ing 1.620 ounces.
13. The method of producing a three-piece golf ball including providing a core of resilient solid material of spherical configuration, molding onto the core a hard, high flexural modulus resinous material providing a first layer on the core, molding a soft, low flexural modulus resinous material onto the first layer providing a cover layer of spherical shape wherein the total weight of the golf ball does not exceed 1.620 ounces and the ball being of a diameter not less than 1.680 inches.
14. The method of producing a three-piece golf ball including providing a core of resilient solid material of spherical configuration, molding onto the core a hard, high flexural modulus surlyn resin providing a first layer on the core, molding a soft, low flexural modulus surlyn resin onto the first layer providing a cover layer of spherical shape wherein the total weight of the golf ball does not exceed 1.620 ounces and the ball being of a diameter not less than 1.680 inches.
CA000410140A 1981-08-25 1982-08-25 Golf ball and method of making the same Expired CA1195710A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/296,146 US4431193A (en) 1981-08-25 1981-08-25 Golf ball and method of making same
US06/296,146 1981-08-25

Publications (1)

Publication Number Publication Date
CA1195710A true CA1195710A (en) 1985-10-22

Family

ID=23140809

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000410140A Expired CA1195710A (en) 1981-08-25 1982-08-25 Golf ball and method of making the same

Country Status (5)

Country Link
US (1) US4431193A (en)
JP (1) JPS5892372A (en)
AU (1) AU552095B2 (en)
CA (1) CA1195710A (en)
GB (1) GB2105595B (en)

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US4431193A (en) 1984-02-14
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GB2105595B (en) 1985-10-02

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