Patent ID: 6315679
Filing Date: 2001-11-13
Classification: A63B

Abstract:
A thread wound golf ball comprising a solid center, a thread rubber layer formed on the solid center, and at least one layer of a cover covering the thread rubber layer, wherein the solid center comprises at least one rubber layer, the rubber layer is formed from a rubber composition comprising a polybutadiene mixture, a metal salt of an unsaturated carboxylic acid, an organic peroxide and an inorganic filler, and the polybutadiene mixture consists of(a) a polybutadiene containing a cis-1,4 bond of not less than 80% and having a Mooney viscosity of 55 to 60 ML,.sub.1+4 (100.degree. C.), synthesized using a nickel-containing catalyst, and(b) a polybutadiene containing a cis-1,4 bond of not less than 40% and having a Mooney viscosity of 20 to 90 ML.sub.1+4 (100.degree. C.), synthesized using lanthanide-containing catalyst, a weight ratio (a)/(b) being 30/70 to 90/10.