GOLF BALL

• Main Authors: MOCHIZUKI, Katsunobu, SHINDO, Jun
• Format: Patent
• Language: English
• Published: 22.06.2023
• Subjects: AMUSEMENTS; APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING,CLIMBING, OR FENCING; BALL GAMES; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GAMES; HUMAN NECESSITIES; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; SPORTS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRAINING EQUIPMENT; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS

In a golf ball having a core and a cover of one or more layer, the core is formed of a material molded under heat from a rubber composition containing(a) a base rubber,(b) water and/or a lower alcohol having a specific molecular weight,(c) an α,β-unsaturated carboxylic acid and/or a metal salt thereof, and(d) an organic peroxide.The base rubber (a) is a rubber obtained by mixing together (a-1) a polybutadiene and (a-2) an unneutralized ethylene-unsaturated carboxylic acid copolymer, and subsequently neutralizing the copolymer with (a-3) a metal oxide. Component (a-2) has a specific acid content and accounts for a specific portion of the combined amount of components (a-1) and (a-2). The core surface and center have a specific JIS-C hardness difference therebetween.This ball achieves both a lower spin rate and excellent durability while maintaining a high rebound.