SU843709A3 - Method of producing catalyst component for propylene polymerization - Google Patents

Abstract

There are disclosed new catalysts for the stereospecific polymerization of alpha-olefins having the formula CH2 = CHR in which R is an alkyl radical containing from l to 4 carbon atoms and the starting components of which comprise (a) a halogenated organometallic A1 compound and (b) reduction products of TiC14 comprising TiC13 in the crystalline beta form.

Description

(54) METHOD FOR OBTAINING THE CATALYST COMPONENT FOR PROPILANE POLYMERIZATION

one

This invention relates to a process for the preparation of a catalyst component for the polymerization of propylene.

Catalysts are known for the polymerization of olefins obtained from T i C 1d by reducing the product with alkyl aluminum halides and from organometallic aluminum compounds.

The reaction between TiCl4 and alkylaluminum halide can be easily directed in such a way as to obtain a product in which titanium is found almost exclusively as a trivalent component. In order to obtain catalysts of high activity and stereospecificity in the polymerization of propylene and similar alpha-olefins, it is necessary that the obtained Ti? L be contained in the reduced product in crdastal-. folic delta form. The crystal delta Form T i CIj can be directly obtained by direct reduction of T i C 1d using AlEtCIji as a reducing agent at relatively low temperatures or by heating the reduced products in which

T | C 1c is in beta form to temperatures above 130 ° C.

Still, even with a very large surface area of the catalytic components containing the delta form of TiCI (about 80-100), their activity is low. This low activity is called 1a by the presence of aluminum compounds in the reconstituted product,

0 such as, for example, aluminum alkyl dihalides.

To overcome this drawback, it was proposed to subject the reconstituted product to treatment with Lewis bases, for example, esters 2.

five

Treatment with Lewis bases is preferably subjected to TiCl in crystalline delta form.

When the treatment is subjected to TI Ij

0 in crystalline beta form or when T i C I, which is already in the delta form, but not subjected to activation by heating at 140-150 ° C, is then stereospecific

5 catalyst is not high enough.

The closest to the proposed technical essence and the achieved effect is the method of obtaining the catalyst component for

Date: 03/05/2001

Number of pages: 2

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Claims (2)

The milling cutter consists of a supporting part 1 and a disc 2. The supporting part is attached to the spindle 3 by means of bolts or screws 4 and has an annular outer part 5 located on the periphery of the disk 2. On the outer part 5 there is an annular projection 6 with a flat surface in which the supporting part 1 abuts. into the hole of the supporting part 'by the central protrusion 7 and fastens on it with the help of a screw 8. A key 9 serves for transmitting the rotation. The cutting elements 10 are fixed on the periphery of the disk 2. The device works as follows. The axial cutting forces are perceived by the Support part 1 through an annular projection b, and the necessary stability in the radial direction is ensured by the sufficient rigidity of the disk 2. The central protrusion 7 serves as a support and centering element in the reference hour τι ?.