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Abstract

A butadiene polymer or a copolymer of butadiene with another conjugated diene having the following structural parameters and physical properties: (a) a content of butadiene moiety in the polymer or copolymer of at least 80% by weight, (b) a content of trans-1,4 linkage in the butadiene moiety of 80% to 95%, (c) a molecular weight distribution (Mw/Mn) of 1.2 to 4.0 as measured by gel permeation chromatography, (d) a melting temperature of the crystal of 40.degree. C. to 130.degree. C. as measured by DSC, and (e) a content of insolubles in boiling cyclohexane of 1% or less; a process for producing butadiene polymers, which comprises carrying out solution polymerization of butadiene monomer or budadiene monomer with another conjugated monomer in an inert solvent in the presence of a catalyst, which is a complex catalyst of (a) an organic acid salt of lanthanum or cerium and (b) an organic magnesium compound; and a polymeric resin material, comprising at least 30% by weight of a trans-butadiene polymer or copolymer as described above as a polymeric component. The above-described polymeric resin material is used as a golf ball cover material, a splint or gyps material, a head mold material for a wig, etc.

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First Claim