| abstract |
SUMMARY "POLYPROPYLENE, PROCESS FOR PREPARING POLYPROPYLENE AND USE OF POLYPROPYLENE" The present invention relates to a polypropylene having a narrow molecular weight distribution and a process for preparing the same, and particularly it relates to a polymer of propylene having a distribution of molecular weight. narrow molecular weight that is prepared directly by polymerization in a reactor using Ziegler-Natta catalyst. The polymer is characterized by relatively high and adjustable isotacticity, narrow molecular weight distribution and high polydispersity index of high molecular weight tails, and is free of propylene regioirregularity, and has a relatively high crystallization temperature and melting point. Compared to polypropylene of narrow molecular weight distribution produced by conventional degradation process, it has advantages in cost, energy saving and environmental protection, and the like. The product of the present invention is particularly suitable for use in applications with relatively high demands on fluidity such as spinning processes, thin wall injection, and casting, and the preparation of transparent materials. Furthermore, due to the narrow molecular weight distribution, the polymer of the present invention also has application advantages that relate to transparency. 1 |