USRE35293E - Solid golf ball - Google Patents

Solid golf ball Download PDF

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Publication number
USRE35293E
USRE35293E US08/405,189 US40518995A USRE35293E US RE35293 E USRE35293 E US RE35293E US 40518995 A US40518995 A US 40518995A US RE35293 E USRE35293 E US RE35293E
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United States
Prior art keywords
rubber
golf ball
solid golf
weight
liquid
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 - Lifetime
Application number
US08/405,189
Inventor
Hidenori Hiraoka
Akihiko Hamada
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.)
Ricoh Printing Systems Ltd
Dunlop Sports Co Ltd
Original Assignee
Sumitomo Rubber Industries Ltd
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Publication date
Application filed by Sumitomo Rubber Industries Ltd filed Critical Sumitomo Rubber Industries Ltd
Priority to US08/405,189 priority Critical patent/USRE35293E/en
Application granted granted Critical
Publication of USRE35293E publication Critical patent/USRE35293E/en
Assigned to SRI SPORTS LIMITED reassignment SRI SPORTS LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SUMITOMO RUBBER INDUSTRIES, LTD.
Assigned to RICOH PRINTING SYSTEMS, LTD. reassignment RICOH PRINTING SYSTEMS, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HITACHI, LTD.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
    • 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
    • A63B37/005—Cores
    • A63B37/0051—Materials other than polybutadienes; Constructional details
    • A63B37/0052—Liquid cores
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
    • C08K5/0025—Crosslinking or vulcanising agents; including accelerators
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/14—Peroxides
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • 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
    • Y10S273/10—Butadiene
    • 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
    • Y10S524/00—Synthetic resins or natural rubbers -- part of the class 520 series
    • Y10S524/908—Composition having specified shape, e.g. rod, stick, or ball, and other than sheet, film, or fiber

Definitions

  • the present invention relates to a golf ball, particularly a one-piece solid golf ball.
  • Golf balls are classified into two types. One is thread wound golf balls which comprise a thread wound core and a cover covering the core, and the other is solid golf balls, e.g. one-piece solid golf balls which are integrally composed of rubber and two solid golf balls which are composed of a rubber core and a cover thereon.
  • the solid golf balls contain at least one rubber portion.
  • the rubber portion has been prepared from a rubber composition which mainly contains as base rubber butadiene rubber or a mixture of butadiene rubber and the other rubber (e.g. natural rubber and isoprene rubber).
  • the base rubbers however, have some problems in processability (for example, mixing process or extruding process), thus resulting in poor production efficiency. These problems are more serious when a polybutadiene having high Mooney viscosity or narrow molecular weight distribution is used to improve the physical properties of golf balls.
  • the present invention is directed to a solid golf ball containing at least one rubber portion formed from a rubber composition comprising a base rubber, a co-crosslinking agent and an organic peroxide; an improvement being present in that the base rubber is a mixture of
  • (B) either a liquid polybutadiene rubber or a liquid isoprene-butadiene copolymer rubber, or both.
  • the polybutadiene rubber (A) employed in the present invention is solid at room temperature and contains cis-1,4-bonds in an amount of at least 40%, preferably at least 80%. If the content of the cis-1,4 bonds is less than 40%, impact resilience is poor.
  • the solid polybutadiene rubber (A) it is preferred that the solid polybutadiene rubber (A) has a high Mooney viscosity or a narrow or sharp molecular weight distribution, especially a Mooney viscosity (ML 1+4 100° C.) of 45 to 90 or a ratio of weight average molecular weight/number average molecular weight (Mw/Mn) of 4.0 or less.
  • the preferred solid polybutadiene (A) exhibits superior technical effects when combined with the liquid rubber component (B).
  • the polybutadiene (A) is commercially available in the tradenames of Ubepole BR 150 L or Ubepole BR 360L (both Ube Industries, Ltd.), BUNA CB 22 or BUNA CB 10 (both Bayer AG) and the like.
  • the rubber component (B) employed in the present invention is either a liquid polybutadiene rubber or a liquid isoprene-butadiene copolymer rubber, or both.
  • the term "liquid” means that the rubber is flowable at room temperature.
  • the liquid rubber component (B) preferably has a number average molecular weight of 1,000 to 50,000. Molecular weights outside the range deteriorate compression and impact resilience of the resulting golf balls or have poor processability.
  • the liquid isoprene-butadiene copolymer rubber preferably contains at least 50% by weight of the butadiene component. If the isoprene component is more than 50% by weight, crosslinking efficiency is poor and the physical properties of the obtained rubber are poor.
  • the rubber component (B) is commercially available, for example the liquid polybutadiene is available from Nippon Oil Co., Ltd. as Nisseki Polybutadiene B-3000 and the liquid isoprene-butadiene copolymer rubber is available from Kuraray Co., Ltd. as Kuraprene LIR-390.
  • a weight ratio of the polybutadiene component (A)/ the liquid rubber component (B) is within the range of 98/2 to 75/25, more preferably 95/5 to 80/20. If the liquid rubber component (B) is less than 2 parts, the technical effects of the present invention are not attained. If it is more than 25 parts, the obtained rubber composition is sticky and adversely makes processability poor.
  • the base rubber of the present invention is mainly composed of the above mentioned two rubber components (A) and (B), but other diene rubbers, such as EPDM, styrenebutadiene rubber, polyisoprene rubber, natural rubber and the like may be added thereto if necessary.
  • the other diene rubber may be present in the base rubber in an amount of 40% by weight or less.
  • the co-crosslinking agent of the present invention can be unsaturated carboxylic acids or metal salts thereof.
  • unsaturated carboxylic acids and metal salts thereof are acrylic acid, methacrylic acid, and divalent metal salts thereof (e.g. zinc salts), and mixtures thereof.
  • An amount of the co-crosslinking agent is within the range of 15 to 60 parts by weight based on 100 parts by weight of the base rubber.
  • the organic peroxide of the present invention can be anyone which is used in this field as polymerization initiator, including dicumyl peroxide, 1,1-bis(t-butyl-peroxy)-3, 3,5-trimethylcyclohexane, 2,5-dimethyl-2,5-di(t-butylperoxy)hexane, di-t-butylperoxide and the like. Preferred is dicumyl peroxide.
  • the organic peroxide may be present in the rubber composition in an amount of 0.3 to 3.0 parts by weight, preferably 1.0 to 2.5 parts by weight based on 100 parts by weight of the base rubber.
  • the rubber composition of the present invention may further contain fillers to control the specific gravity of the resulting golf balls.
  • Typical examples of the fillers are zinc oxide, barium sulfate, calcium carbonate silicate hydrate and the like.
  • the rubber composition also contains antioxidants, chain transfer agents, stabilizers and the like to enhance the performances of the resulting golf balls.
  • the rubber composition of the present invention can be prepared by mixing the above mentioned components, using a roll, a kneader, a Banbury mixer and the like. Mixing temperature and time are known in the art.
  • the solid golf balls of the present invention may be obtained by vulcanizing the rubber composition in a mold and optionally covering it with a cover material (e.g. ionomer resin). Vulcanization may be generally conducted at a temperature of 140° to 180° C. for 15 to 55 minutes.
  • a cover material e.g. ionomer resin
  • the rubber composition of the present invention can be easily processed or treated by mixing the polybutadiene rubber with the specific liquid rubber component (B). It is surprisingly that the golf balls obtained from the rubber composition have excellent impact durability and hit feeling.
  • a rubber composition was prepared from the ingredients shown in Table 1, using a kneader and a roller, and then vulcanized in a mold at 168° C. for 25 minutes to obtain a one-piece solid golf ball.
  • the processability of the rubber composition was determined and the result is shown in Table 1.
  • the resulting golf ball was subjected to a measurement of physical properties (ball weight, compression, impact durability and hit feeling) and the results are shown in Table 1.

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  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

Disclosed is a solid golf ball containing at least one rubber portion formed from a rubber composition comprising a base rubber, a co-crosslinking agent and an organic peroxide; an improvement being present in that the base rubber is a mixture of
(A) a solid polybutadiene rubber containing cis-1,4 bonds in an amount of at least 40%, and
(B) either a liquid polybutadiene rubber or a liquid isoprene-butadiene copolymer rubber, or both.

Description

FIELD OF THE INVENTION
The present invention relates to a golf ball, particularly a one-piece solid golf ball.
BACKGROUND OF THE INVENTION
Golf balls are classified into two types. One is thread wound golf balls which comprise a thread wound core and a cover covering the core, and the other is solid golf balls, e.g. one-piece solid golf balls which are integrally composed of rubber and two solid golf balls which are composed of a rubber core and a cover thereon.
The solid golf balls contain at least one rubber portion. The rubber portion has been prepared from a rubber composition which mainly contains as base rubber butadiene rubber or a mixture of butadiene rubber and the other rubber (e.g. natural rubber and isoprene rubber). The base rubbers, however, have some problems in processability (for example, mixing process or extruding process), thus resulting in poor production efficiency. These problems are more serious when a polybutadiene having high Mooney viscosity or narrow molecular weight distribution is used to improve the physical properties of golf balls.
SUMMARY OF THE INVENTION
The inventors have found that a rubber composition containing as a base rubber a mixture of a solid polybutadiene rubber and a specific liquid polybutadiene rubber significantly improves the processability and surprisingly enhances the physical properties of the resulting solid golf balls (e.g. durability, impact resilience, hit feeling and the like). Accordingly the present invention is directed to a solid golf ball containing at least one rubber portion formed from a rubber composition comprising a base rubber, a co-crosslinking agent and an organic peroxide; an improvement being present in that the base rubber is a mixture of
(A) a solid polybutadiene rubber containing cis-1,4 bonds in an amount of at least 40%, and
(B) either a liquid polybutadiene rubber or a liquid isoprene-butadiene copolymer rubber, or both.
DETAILED DESCRIPTION OF THE INVENTION
The polybutadiene rubber (A) employed in the present invention is solid at room temperature and contains cis-1,4-bonds in an amount of at least 40%, preferably at least 80%. If the content of the cis-1,4 bonds is less than 40%, impact resilience is poor. Among the solid polybutadiene rubber (A), it is preferred that the solid polybutadiene rubber (A) has a high Mooney viscosity or a narrow or sharp molecular weight distribution, especially a Mooney viscosity (ML1+4 100° C.) of 45 to 90 or a ratio of weight average molecular weight/number average molecular weight (Mw/Mn) of 4.0 or less. The preferred solid polybutadiene (A) exhibits superior technical effects when combined with the liquid rubber component (B). The polybutadiene (A) is commercially available in the tradenames of Ubepole BR 150 L or Ubepole BR 360L (both Ube Industries, Ltd.), BUNA CB 22 or BUNA CB 10 (both Bayer AG) and the like.
The rubber component (B) employed in the present invention is either a liquid polybutadiene rubber or a liquid isoprene-butadiene copolymer rubber, or both. The term "liquid" means that the rubber is flowable at room temperature. The liquid rubber component (B) preferably has a number average molecular weight of 1,000 to 50,000. Molecular weights outside the range deteriorate compression and impact resilience of the resulting golf balls or have poor processability. The liquid isoprene-butadiene copolymer rubber preferably contains at least 50% by weight of the butadiene component. If the isoprene component is more than 50% by weight, crosslinking efficiency is poor and the physical properties of the obtained rubber are poor. The rubber component (B) is commercially available, for example the liquid polybutadiene is available from Nippon Oil Co., Ltd. as Nisseki Polybutadiene B-3000 and the liquid isoprene-butadiene copolymer rubber is available from Kuraray Co., Ltd. as Kuraprene LIR-390.
In the base rubber, it is preferred that a weight ratio of the polybutadiene component (A)/ the liquid rubber component (B) is within the range of 98/2 to 75/25, more preferably 95/5 to 80/20. If the liquid rubber component (B) is less than 2 parts, the technical effects of the present invention are not attained. If it is more than 25 parts, the obtained rubber composition is sticky and adversely makes processability poor.
The base rubber of the present invention is mainly composed of the above mentioned two rubber components (A) and (B), but other diene rubbers, such as EPDM, styrenebutadiene rubber, polyisoprene rubber, natural rubber and the like may be added thereto if necessary. The other diene rubber may be present in the base rubber in an amount of 40% by weight or less.
The co-crosslinking agent of the present invention can be unsaturated carboxylic acids or metal salts thereof. Examples of the unsaturated carboxylic acids and metal salts thereof are acrylic acid, methacrylic acid, and divalent metal salts thereof (e.g. zinc salts), and mixtures thereof. An amount of the co-crosslinking agent is within the range of 15 to 60 parts by weight based on 100 parts by weight of the base rubber. The organic peroxide of the present invention can be anyone which is used in this field as polymerization initiator, including dicumyl peroxide, 1,1-bis(t-butyl-peroxy)-3, 3,5-trimethylcyclohexane, 2,5-dimethyl-2,5-di(t-butylperoxy)hexane, di-t-butylperoxide and the like. Preferred is dicumyl peroxide. The organic peroxide may be present in the rubber composition in an amount of 0.3 to 3.0 parts by weight, preferably 1.0 to 2.5 parts by weight based on 100 parts by weight of the base rubber.
The rubber composition of the present invention may further contain fillers to control the specific gravity of the resulting golf balls. Typical examples of the fillers are zinc oxide, barium sulfate, calcium carbonate silicate hydrate and the like. The rubber composition also contains antioxidants, chain transfer agents, stabilizers and the like to enhance the performances of the resulting golf balls.
The rubber composition of the present invention can be prepared by mixing the above mentioned components, using a roll, a kneader, a Banbury mixer and the like. Mixing temperature and time are known in the art.
The solid golf balls of the present invention may be obtained by vulcanizing the rubber composition in a mold and optionally covering it with a cover material (e.g. ionomer resin). Vulcanization may be generally conducted at a temperature of 140° to 180° C. for 15 to 55 minutes.
The rubber composition of the present invention can be easily processed or treated by mixing the polybutadiene rubber with the specific liquid rubber component (B). It is surprisingly that the golf balls obtained from the rubber composition have excellent impact durability and hit feeling.
EXAMPLES
The present invention is illustrated by the following Examples which, however, are not to be construed as limiting the present invention to their details.
EXAMPLES 1-7 and COMPARATIVE EXAMPLES 1 and 2
A rubber composition was prepared from the ingredients shown in Table 1, using a kneader and a roller, and then vulcanized in a mold at 168° C. for 25 minutes to obtain a one-piece solid golf ball. The processability of the rubber composition was determined and the result is shown in Table 1.
The resulting golf ball was subjected to a measurement of physical properties (ball weight, compression, impact durability and hit feeling) and the results are shown in Table 1.
                                  TABLE 1                                 
__________________________________________________________________________
Rubber composition                                                        
               Examples                     Comp. Ex.                     
(parts by weight)                                                         
               1    2   3   4   5   6   7   1    2                        
__________________________________________________________________________
Ubepol BR 150L*.sup.1                                                     
               98   90  80  90  80  --  --  100  --                       
Ubepol BR 360L*.sup.2                                                     
               --   --  --  --  --  90  80  --   100                      
Kuraprene LIR-390*.sup.3                                                  
               2    10  20  --  --  10  20  --   --                       
Nisseki Polybutadiene B-3000*.sup.4                                       
               --   --  --  10  20  --  --  --   --                       
Zinc oxide     25   25  25  25  25  25  25  25   25                       
Methacrylic acid                                                          
               25   25  25  25  25  25  25  25   25                       
Dicumyl peroxide                                                          
               1.0  1.0 1.0 1.0 1.0 1.0 1.0 1.0  1.0                      
Antioxidant    0.15 0.15                                                  
                        0.15                                              
                            0.15                                          
                                0.15                                      
                                    0.15                                  
                                        0.15                              
                                            0.15 0.15                     
Processability*.sup.5                                                     
               Good Very                                                  
                        Very                                              
                            Very                                          
                                Very                                      
                                    Very                                  
                                        Very                              
                                            Poor Poor                     
                    good                                                  
                        good                                              
                            good                                          
                                good                                      
                                    good                                  
                                        good                              
Ball weight (g)                                                           
               45.3 45.3                                                  
                        45.2                                              
                            45.3                                          
                                 45.2                                     
                                    45.3                                  
                                        45.2                              
                                            45.4 45.4                     
Compression*.sup.6                                                        
               100  101 100 98  97  102 101 100  101                      
Impact durability*.sup.7                                                  
               109  120 130 131 142 125 135 100  105                      
Hit feeling*.sup.8                                                        
               Normal                                                     
                    Good                                                  
                        Good                                              
                            Good                                          
                                Good                                      
                                    Good                                  
                                        Good                              
                                            Normal                        
                                                 Normal                   
__________________________________________________________________________
 *.sup.1 High cispolybutadiene rubber having a Mooney viscosity (ML.sub.1+
 100° C.) of 43, a molecular weight distribution (Mw/Mn) of 2.8, a 
 sis1,4-bond of about 95% and a number average molecular weight of 210,000
 available from Ube Industries, Ltd.                                      
 *.sup.2 High cispolybutadiene rubber having a Mooney viscosity (ML.sub.1+
 100° C.) of 50, a molecular weight distribution (Mw/Mn) of 2.7, a 
 sis1,4-bond of about 95% and a number average molecular weight of 250,000
 available from Ube Industries, Ltd.                                      
 *.sup.3 Isoprene-butadiene copolymer liquid rubber having a number averag
 molecular weight of 35,000, and a butadiene content of 80% by weight,    
 available from Kuraray Co., Ltd.                                         
 *.sup.4 Liquid polybutadiene rubber having a number average molecular    
 weight of 3,000, available from Nippon Oil Co., Ltd.                     
 *.sup.5 Processability was evaluated with roll winding condition,        
 dispersibility of components, stock surface condition after rolling and  
 stock surface condition after rubberextruding. Very good: all items (i.e.
 roll winding condition, dispersibility of components, stock surface      
 condition after rolling and stock surface condition after rubberextruding
 is good. Good: Roll winding condition dispersibility of components and   
 stock surface condition after rolling are good, but stock surface is     
 slightly rough after rubberextruding. Poor: Roll winding condition is ver
 poor when a rubber temperature is elevated. The surface after rubber     
 extruding is like pine cones even if it is extruded at low speed.        
 *.sup.6 Compression is determined by PGA rules. It is expressed as an    
 index when Comparative Example 1 is set 100. The larger is harder.       
 *.sup.7 A golf ball is repeatedly struck with an impact panel at a speed 
 of 45 m/s until the ball was broken out. Number of strikes is expressed a
 an indes when that of Comparative Example 1 is 100. The larger the more  
 durable.                                                                 
 *.sup.8 An average of hit feeling with drivers of two men professional   
 golfers, one woman professional golfer and three top amateur golfers with
 a handicap of 3 to 8.
The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.

Claims (8)

What is claimed is:
1. A solid golf ball containing at least one rubber portion formed from a rubber composition comprising a base rubber, a co-crosslinking agent and an organic peroxide; an improvement being present in that said base rubber is a mixture of
(A) a solid polybutadiene rubber containing cis -1,4 bonds in an amount of at least 40%, and having a Moooney viscosity (ML1+4 100° C. ) of .[.45.]. .Iadd.43 .Iaddend.to 90 and a ratio of weight average molecular weight/number average molecular weight (Mx/Mn) of 4.0 or less; and
(B) either a liquid polybutadiene rubber or a liquid isoprene-butadiene copolymer rubber, or both.
2. The solid golf ball according to claim 1 wherein said liquid rubber component (B) has a number average molecular weight of 1,000 to 50,000.
3. The solid golf ball according to claim 1 wherein said liquid rubber component (B) does not have carboxyl groups at the terminals of the molecule.
4. The solid golf ball according to claim 1 wherein a weight ratio of polybutadiene component (A)/liquid rubber component (B) is within the range of 98/2 to 72/25.
5. The solid golf ball according to claim 1 wherein said co-crosslinking agent is acrylic acid, methacrylic acid or a divalent metal salt thereof.
6. The solid golf ball according to claim 1 wherein an amount of the co-crosslinking agent is within in the range of 15 to 60 parts by weight based on 100 parts by weight of the base rubber.
7. The solid golf ball according to claim 1 wherein said organic peroxide includes dicumyl peroxide, 1,1-bis(t-butylperoxy)-3,3,5-trimethylcyclohexane, 2,5-dimethyl-2, 5-di(t-butylperoxy)hexane or di-t-butylperoxide.
8. The solid golf ball according to claim 1 wherein said organic peroxide is present in the rubber composition in an amount of 0.3 to 3.0 parts by weight based on 100 parts by weight of the base rubber.
US08/405,189 1990-07-13 1995-03-16 Solid golf ball Expired - Lifetime USRE35293E (en)

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JP2186289A JP2922993B2 (en) 1990-07-13 1990-07-13 Solid golf ball
JP2-186289 1990-07-13
US07/724,770 US5215308A (en) 1990-07-13 1991-07-02 Solid golf ball
US08/405,189 USRE35293E (en) 1990-07-13 1995-03-16 Solid golf ball

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6180040B1 (en) 1998-09-02 2001-01-30 Acushnet Company Method of forming a golf ball core
US6277920B1 (en) 1992-04-24 2001-08-21 Spalding Sports Worldwide, Inc. Golf ball cores formed from ultra-high mooney viscosity butadiene rubber
US6290797B1 (en) 1999-04-02 2001-09-18 Acushnet Company Process for making multi-layer core golf balls
US6315684B1 (en) 1992-04-24 2001-11-13 Spalding Sports Worldwide, Inc. Golf ball with soft core
US6325730B1 (en) 1992-04-24 2001-12-04 Spalding Sports Worldwide, Inc. Golf ball with soft core
US6376612B1 (en) 1992-04-24 2002-04-23 Spalding Sports Worldwide, Inc. Golf ball
US6394915B1 (en) 1992-04-24 2002-05-28 Spalding Sports Worldwide, Inc. Golf ball cores formed from blends of neodymium and cobalt synthesized high molecular weight butadiene rubber
US6413172B1 (en) 1992-04-24 2002-07-02 Spalding Sports Worldwide, Inc. Golf ball with soft core
US6419594B1 (en) 1993-06-01 2002-07-16 Spalding Sports Worldwide, Inc. Distance multi-layer golf ball
US6422953B1 (en) 1992-04-24 2002-07-23 Spalding Sports Worldwide, Inc. Golf ball
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US6422953B1 (en) 1992-04-24 2002-07-23 Spalding Sports Worldwide, Inc. Golf ball
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DE69106813T2 (en) 1995-07-13
EP0471446A1 (en) 1992-02-19
JP2922993B2 (en) 1999-07-26
EP0471446B1 (en) 1995-01-18

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