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Golf ball cover
| Details |
Inventors: Cadorniga, Lauro C.; Simonutti, Frank M.;
Assignee: Dunlop Slazenger Corporation (Greenville, SC)
Primary Examiner: Ryan; Patrick J.
Assistant Examiner: Macholl; Marie R.
Attorney, Agent or Firm: Lorusso & Loud
An improved golf ball including a novel cover composition, including a blend of a high stiffness ionomer having a melt index of 0.5-5.0 g/min., flexural modulus of 60,000-120,000 psi and shore hardness of 70 or greater and a very low modulus methacrylic acid ionomer having a melt index of 0.5 to 10.0 g/min., flexural modulus of 2,000-8,000 psi or less and Shore D hardness of 20-50. The resulting golf ball shows improved resilience and playability over known golf balls. |
|
DETAILED DESCRIPTION OF THE INVENTION The cover material of the present invention, and golf balls covered with this material, are produced by blending a high-stiffness ionomer and a very low modulus ionomer.
Golf balls made with the covers produced from the compositions of the present invention show marked improvement in resilience, measured by the coefficient of restitution "C.
O.
R.
", and in initial velocity tests, over prior art golf balls.
C.
O.
R.
is the ratio of the relative velocity of two elastic spheres after direct impact to that before impact.
C.
O.
R.
can vary from zero to one, with one being equivalent to an elastic collision and zero being equivalent to an inelastic collision.
C.
O.
R.
is one of the principle factors in determining the distance a ball will travel when hit.
Initial velocity is also improved in golf balls utilizing the cover composition of the present invention.
Initial velocity is the velocity of a golf ball when struck at a speed specified by the United States Golf Association.
As used herein, the term "high-stiffness ionomer" is defined as a copolymer including 75-80% of an olefin, most commonly ethylene, and 20-25% of an alpha, beta ethylenically unsaturated caboxylic acid, such as acrylic or methacrylic acid, having 10-90% of the carboxylic acid groups neutralized with sodium, lithium, zinc or magnesium ions.
For example, various types of SURLYN, available from E.
I.
DuPont de Nemours & Company, Incorporated of Wilmington, Del.
are acceptable for use in the present invention as the high stiffness ionomer resin.
Additionally, the high stiffness ionomer will preferably have a melt index of 0.
5-5.
0 g/10 min.
, Shore D hardness of 70 or greater, and a flexural modulus of 60,000-120,000 psi.
Certain high stiffness ionomers useful in the present invention have the following physical properties:
______________________________________
Flexural
Material Ion Type % Acid Modulus
Shore "D"
______________________________________
Surlyn 8240
Na 20 75,000 75
Surlyn 8220
Na 20 79,000 75
Surlyn AD 8181
Li 20 97,000 73
______________________________________
Flexural modulus testing performed according to ASTM D790 test procedure
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