Use of ziegler-natta catalyst to make a polypropylene homopolymer or random copolymer having a high melt flow rate

Abstract

The present invention relates to a method for producing propylene homopolymer or random copolymer which has the characteristics of faint odor, low volatile content and high flux fluidity. The propylene homopolymer or random copolymer is suitable for the application of thin-wall injection molding. The method comprises a step of polymerizing propylene and one or a plurality of random comonomer in the presence of Ziegler-Natta catalyst, organic aluminium component and random external object, wherein the Ziegler-Natta catalyst comprises a titanium compound having at least one titanium-halogen bond and a succinate compound as internal electron donor. The titanium compound and succinate are loaded on magnesium halide with an active form.

Description

technical field [0001] The present invention relates to a process for the production of high melt flow propylene homopolymers or random copolymers with low odor and low volatile matter content, which are suitable for thin wall injection molding applications. Background technique [0002] Polyolefins are well known commercial polymers that are used in a variety of molded and extruded articles. In particular, polypropylene has been widely used in thin wall injection molding applications. Advantageously, a polypropylene with high flowability is used, ie a polypropylene with a melt flow index greater than 40 dg / min. This polypropylene allows the production of articles with very thin walls, high flow length / thickness ratios and complex geometries. They also allow for lower injection temperatures and pressures, leading to increased production speeds and energy and cost savings. [0003] by the polymerization of propylene with one or more optional comonomers in the presence of ...

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The by-products can also be toxic