To provide a styrene copolymer having sufficient melt viscoelasticity and being excellent in moldability, etc., and a process for producing the same.
This invention provides a styrene copolymer comprising 100-40wt.% units (A) derived from a styrene compound, 0-60wt.% units (B) derived from other copolymerizable compounds and 0.001-2 pts.wt., per 100 pts.wt. total of units A and B, units (C) derived from a reactive double metal carboxylate represented by the formula: M (Acid1)x (Acid2)N-x (wherein M is a metal having a positive valence of N, Acid1 is an α,β-ethylenically unsaturated carboxylic acid, Acid2 is a carboxylic acid other than Acid1 and X (≠0, X<N) and N-X (≠0) are the numbers of moles necessary to form a salt with metal M, respectively) and a process for producing the same, which comprises dissolving 0.001-2 pts.wt. reactive double metal carboxylate represented by the formula in 100 pts.wt. styrene monomer or a mixture thereof with at least one copolymerizable monomer and radical-polymerizing the monomers.
TANAKA HIROSHIGE
SEKINE MASAHIRO
