| 主权项 |
1. A method for preparing a golf ball composition comprising:
a step of producing a diene polymer (A) having a peak top molecular weight (Mp) on a molecular weight distribution curve measured using gel permeation chromatography (GPC) of at least 40×104 and not more than 100×104; which is synthesized using as a catalyst at least one type of complex selected from the group consisting of metallocene complexes of general formulae (I) and (II) below, and half-metallocene cation complexes of general formula (III) below, and using an organolaluminum compound of the general formula AIRR′R″ wherein R and R′ are each independently a C1-10 hydrocarbon group, a chlorine or a hydrogen atom, and R″ is a C1-10 hydrocarbon group in an amount of from 100 to 500 moles per mole of the metallocene complex as a co-catalyst; wherein the center metal M in general formulae (I), (II) and (III) is gadolinium: wherein in formula (I), each occurrence of CpR is a substituted or unsubstituted indenyl; Ra to Rf are each independently an alkyl group of 1 to 3 carbons or a hydrogen atom; L is a neutral Lewis base; and w is an integer from 0 to 3; wherein in formula (II), each occurrence of CpR is a substituted or unsubstituted indenyl; X′ is a hydrogen atom, a halogen atom, an alkoxide group, a thiolate group, an amide group, a silyl group or a hydrocarbon group of 1 to 20 carbons; L is a neutral Lewis base; and w is an integer from 0 to 3; wherein in formula (III), CpR′ is a substituted or unsubstituted cyclopentadienyl, indenyl or fluorenyl; X is a hydrogen atom, a halogen atom, an alkoxide group, a thiolate group, an amide group, a silyl group or a hydrocarbon group of 1 to 20 carbons; L is a neutral Lewis base; w is an integer from 0 to 3; and [B]− is a non-coordinating anion; and then a step of compounding the diene polymer (A) with an unsaturated carboxylic acid and/or a metal salt thereof (B), and an organic peroxide (D) to make up the golf ball composition. |
