| US 7,381,776 B2 | ||
| Crosslinked rubber moldings for golf balls and method of manufacture | ||
| Atsushi Nanba, Chichibu (Japan); and Jun Shindo, Chichibu (Japan) | ||
| Assigned to Bridgestone Sports Co., Ltd., Tokyo (Japan) | ||
| Filed on Apr. 08, 2005, as Appl. No. 11/101,549. | ||
| Prior Publication US 2006/0229414 A1, Oct. 12, 2006 | ||
| Int. Cl. A63B 37/06 (2006.01); A63B 37/12 (2006.01); A63B 37/14 (2006.01); B05D 3/06 (2006.01) | ||
| U.S. Cl. 525—387 [473/351; 473/377; 473/374; 473/373; 427/385.5; 427/493] | 8 Claims |
| 1. A crosslinked rubber molding for golf balls obtained by spherically molding and crosslinking a rubber composition comprising
a base rubber, a co-crosslinking agent and a crosslinking agent, then impregnating the crosslinked rubber molding with a rubber
compounding chemical and inducing a chemical reaction,
wherein the rubber compounding chemical is a polymerizable monomer and/or a crosslinking agent,
wherein the rubber compounding chemical-impregnated crosslinked molding has (i) a higher surface hardness than the crosslinked
molding prior to impregnation, (ii) a center hardness of from 30 to 80 in JIS-C hardness, and (iii) a surface hardness of
from at least 75 in JIS-C to not more than 85 in Shore D, and
wherein the rubber compounding chemical is allowed to penetrate from the surface of the crosslinked molding to a depth of
at least 10 mm toward the center.
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