Golf ball
AssigneeSumitomo Rubber Industries, Ltd.
InventorsSeiichiro Endo, Masatoshi Yokota
Life of this patent
Estimating the term…
Abstract
The present invention provides a golf ball having excellent controllability at the time of approach and excellent shot feel, wherein spin is easily put on. A cover of the golf ball is composed of a mixture of specific three ionomer resins (1), (2) and (3), wherein the total amount of the resin (1) and resin (2) is not less than 85% by weight and the amount of the resin (3) is not more than 15% by weight in the mixture as a main component, and wherein the amount of the resin (1) is 30 to 82% by weight and the amount of the resin (2) is 3 to 55% by weight in the total of the resin (1) and resin (2) and a stiffness of the cover composition is 1,000 to 2,000 kg/cm.sup.2.
Claims5
A golf ball having a core and a cover for covering the core, wherein a base resin of said cover comprises a mixture of the following resin (1), resin (2) and resin (3) as a main component, the total amount of the resin (1) and resin (2) being 85 to 98% by weight of the mixture;
- the amount of the resin (3) being 2 to 15% by weight of the mixture;
- the amount of the resin (1) being 35 to 96.5% by weight and the amount of the resin (2) being 3.5 to 65% by weight of the total of resin (1) and resin (2);
- and a stiffness of the cover composition being 1,000 to 2,000 kg/cm.sup.2, wherein resins (1), (2) and (3) are as follows:
- resin (1):
- an ionomer resin having a stiffness of 700 to 1,200 kg/cm.sup.2, which is obtained by neutralizing a terpolymer of ethylene, methacrylic acid and acrylate with zinc ion;
- resin (2):
- an ionomer resin having a stiffness of 2,500 to 5,000 kg/cm.sup.2, which is obtained by neutralizing a copolymer of ethylene and methacrylic or acrylic acid with zinc ion;
- and
- resin (3):
- an ionomer resin having a stiffness of 2,300 to 5,000 kg/cm.sup.2, which is obtained by neutralizing a copolymer of ethylene and methacrylic or acrylic acid with an alkali metal ion.
Dependencies are inferred from the claim text.