| abstract |
The present invention relates to a method for preparing a polyolefin by using a supported hybrid metallocene catalyst. According to the present invention, a polyolefin having a narrow molecular weight distribution can be very effectively prepared by injecting an amount of a cocatalyst in the optimum range in the presence of a supported hybrid metallocene catalyst comprising two or more types of metallocene compounds having specific chemical structures. Particularly, a polyolefin prepared according to the preparation method of the present invention shows excellent chlorine distribution uniformity within a polyolefin during chlorination, and can remarkably improve the elongation, the compatability with PVC, the impact modification performance and the like of a chlorinated polyolefin, thereby having excellent chemical resistance, weather resistance, flame retardancy, processability, impact strength modification effect and the like, and thus is suitably applicable to an impact modifier of a PVC pipe and a window profile, and the like. |