Patent ID: 6476284
Filing Date: 2002-11-05
Classification: C08F

Abstract:
A method for producing butene polymer having a low halogen content and a high terminal vinylidene content, comprising:step (I) feeding into a polymerization zone a starting material of C4 components comprising less than 50% by mass of 1-butene, less than 50% by mass of 2-butene, less than 100% by mass of isobutene, less than 50% by mass of butanes and less than 10% by mass of butadiene, 0.1 to 500 mmole of boron trifluoride relative to 1 mole of isobutene contained in said starting material, and 0.03 to 1,000 mmole of alcohol and/or dialkyl ether as complexing agents relative to 1 mole of isobutene contained in said starting material, and carrying out liquid-phase polymerization continuously at a polymerization temperature in the range of âˆ’100Â° C. to +50Â° C. and for a residence time in the range of 5 minutes to 4 hours; step (II) deactivating the catalyst contained in the effluent reaction mixture from the polymerization zone, then optionally subjecting the reaction mixture to distillation, to obtain butene polymer containing residual halogen of 1 ppm or more and terminal vinylidene group of 60% or more; and step (III) contacting said butene polymer with an inorganic solid treating agent containing aluminum atoms, while maintaining the coexistence of a basic substance in an amount to suppress isomerization of said terminal vinylidene group, thereby obtaining butene polymer containing 40 ppm or less of residual halogen and maintaining the content of terminal vinylidene group of 60% or more relative to the value before the treatment.