To provide a process for preparing a styrene polymer which enables the mol.wt. of a resultant polymer to be easily regulated by polymerizing a styrene compd. in the presence of a polyman. initiator comprising a complex of a group 8 metal of the periodic table, a specified aluminum compd., and a halogenated compd.
A polymn. initiator comprising a complex (A) of a group 8 metal of the periodic table [e.g. dichlorotris(triphenylphosphine) ruthenium], an aluminum compd. (B) represented by formula I (wherein L1, L2, and L3 represent an alkyl, an alkoxy, an aryl, an aryloxy, or a halogen) (e.g. triisopropoxyaluminum), and a compd. (C) represented by formula II (wherein X1 represents a halogen; and X2, X3, and X4 represent a halogen, H, an alkyl, an aryl, or an org. group contg. a hetero atom) (e.g. carbon tetrachloride) and/or a halogenated sulfonyl compd. represented by formula III (wherein R represents a hydrocarbon; and X represents a halogen) (e.g. benzenesulfonyl chloride) is prepd. A styrene compd. is polymerized in the presence of this polymn. initiator to obtain a styrene polymer.
UEGAKITO MASAMI
KOTANI YUZO
