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AssigneeAsahi Kasei Kogyo Kabushiki Kaisha
InventorsTakeshi Ikematsu, Yasuo Hattori, Yoshihiro Inoki, Mitsuhiro Tanaka
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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.
A process for producing butadiene polymers, which comprises carrying out polymerization of butadiene monomer or butadiene monomer with another conjugated monomer in the presence of a complexed catalyst, wherein said complexed catalyst is comprised of (a) a salt of a metal consisting of lanthanum or cerium with an organic acid and (b) an organic magnesium compound, wherein the amount of the catalytic component (a) is 0.01 to 1 m mole and the amount of the catalytic component (b) is 0.02 to 1.2 m mole, respectively, per 100 g of the conjugated diene monomer, and further the molar ratio of (a)/(b) is 10/1 to 1/50, the catalyst component (a) being derived from an organic acid of the following formulae (I) to (VI) ##STR16## wherein each of the radicals R.sup.3 to R.sup.6 is an aliphatic hydrocarbon group or an aromatic hydrocarbon group, R.sup.1 is an aromatic hydrocarbon group, R.sup.2 is an aliphatic hydrocarbon group, each of the radicals R.sup.7 to R.sup.10 is an aliphatic hydrocarbon group, an aromatic hydrocarbon group, an alkoxy group or a phenoxy group, and j, k, l and m are integers of from 1 to 6.
Dependencies are inferred from the claim text.