Patent ID: 6277934
Filing Date: 2001-08-21
Classification: C07F,C08F,C08G,Y10S

Abstract:
A process for producing a syndiotactic homopolymer or syndiotactic copolymer, which comprises polymerizing or copolymerizing at least one styrenic compound in the presence of a catalyst, comprising (A) a transition metal compound, and (B) an organic aluminoxy compound, in which said transition metal compound (A) has the formula:TiR.sup.1 R.sup.2 R.sup.3 R.sup.4or the formula:TiR.sup.1 R.sup.2 R.sup.3wherein R.sup.1 represents cyclopentadienyl, substituted cyclopentadienyl, indenyl, substituted indenyl, fluorenyl or octahydrofluorenyl;R.sup.2, R.sup.3, and R.sup.4 each independently represents alkyl, alkoxy, alkylthio, aryl, amino, amido, acyloxy, phosphide, halogen or a chelating ligand; andthe organic aluminoxy compound (B) exhibits a .sup.27 Al nuclear magnetic resonance spectrum (.sup.27 Al-NMR spectrum) having an A.sub.1 /A.sub.2 ratio of at most 0.1, wherein A.sub.1, is an area of a region encompassed by a segment of a line which connects a local minimum point existing between a continuous curve ""a"" containing a peak appearing at around 150 ppm and a continuous curve ""b"" containing a peak appearing at around 60 ppm to the point where the above curve ""b"" comes into contact with the base line and also by the above curve ""b"", and A.sub.2 is an area of a region encompassed by the above curves ""a"" and ""b"" and also by the base line, which contains at least 5%, expressed in terms of aluminum atoms, of a portion insoluble in a mixed solvent of toluene and hexane in a ratio by volume of about 2:5 at 30.degree. C. or lower, and being formed from an organoaluminum compound having the formula:R.sup.3 Alwherein R represents an alkyl group having 1 to 3 carbon atoms, which are the same or different from each other.