Patent ID: 7614965

Claim:
A golf ball comprising a ball component made of a material molded under heat from a rubber composition comprised of: (A) from 1 to 30 parts by weight of a modified polybutadiene obtained by a modification reaction wherein a polybutadiene having a vinyl content of from 0 to 2%, a cis-1,4 bond content of at least 80% and an active end is modified at the active end with at least one type of alkoxysilane compound, and (B) at least 50 parts by weight of polybutadiene synthesized using a rare-earth catalyst and having a stress relaxation time (T 80 ) of less than 4.0; and also comprised of the following per 100 parts by weight of ingredients A and B combined: (C) from 10 to 50 parts by weight of an unsaturated carboxylic acid and/or a metal salt thereof, (D) from 5 to 80 parts by weight of an inorganic filler, and (E) from 0.1 to 10 parts by weight of an organic peroxide.