C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/626
C08F 110/06 (2006.01) C08F 6/02 (2006.01)
Patent
CA 2029878
Disclosed herein is a process for preparing a syndiotactic polypropylene comprising washing with a hydrocarbon solvent a polymer obtained by polymerizing propylene in the presence of a catalyst comprising a transition metal compound having an asymmetric ligand. When the slurry of the polymer obtained by the polymerization is treated with a .beta.-dicarboxy compound and an alcohol or with an alcohol containing hydrochloric acid gas under non-aqueous conditions prior to the washing with a hydrocarbon solvent so that the residue of the catalyst used in the polymerization reaction may be rendered soluble in the hydrocarbon solvent, the properties of the resulting syndiotactic polypropylene are improved greatly.
L'invention présente un procédé pour préparer un polypropylène syndiotactique, consistant à laver, à l'aide d'un solvant hydrocarboné, un polymère obtenu par polymérisation de propylène en présence d'un catalyseur à base d'un métal de transition renfermant un ligand asymétrique. Lorsque la suspension du polymère est traitée avec un composé bêta-dicarboxylé et un alcool renfermant ou non de l'acide chlorhydrique gazeux, dans des conditions non aqueuses, avant le lavage au solvant hydrocarboné, de telle façon que le résidu du catalyseur utilisé dans la réaction de polymérisation puisse être solubilisé dans le solvant hydrocarboné, alors le polypropylène syndiotactique résultant se trouve grandement amélioré.
Asanuma Tadashi
Inoue Norihide
Iwatani Tutomu
Sasaki Tateyo
Shiomura Tetsunosuke
Fetherstonhaugh & Co.
Mitsui Chemicals Incorporated
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