Catalyst and prepolymer used for the preparation of polyolefins

Details Catalyst and prepolymer used for the preparation of polyolefins Catalyst and prepolymer used for the preparation of polyolefins

1994-02-03

1995-08-08

Smith, Edward J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

5263486, 526352, 526901, 526904, C08F 4654, C08F 1002

Patent

active

054399955

ABSTRACT:
The present invention relates to a solid catalyst suitable for polymerizing olefins in a heterogeneous process, the catalyst consisting of spheroidal particles having a narrow particle size distribution and comprising (i) a support containing magnesium dichloride and an electron-donor free from labile hydrogene, (ii) a zirconium metallocene, and (iii) optionally an organoaluminium compound which is an aluminoxane preferably. The solid catalyst may be used in the form of a prepolymer comprising a polyethylene or a copolymer of ethylene and an active zirconium metallocene catalyst essentially consisting of atoms of Zr, Mg, Cl and Al, preferably in the form of spheriodal particles. The solid catalyst or the prepolymer may be used for producing polyethylene or copolymer of ethylene having from 0.5 to 20 ppm of Zr and a molecular weight distribution from 2 to 5, in the form of a powder having a bulk density from 0.3 to 0.55 g/cm.sup.3, preferably consisting of spheroidal particles.

REFERENCES:
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patent: 4487846 (1984-12-01), Bailly
patent: 4659685 (1987-04-01), Coleman
patent: 4721763 (1988-01-01), Bailly
patent: 4814314 (1989-03-01), Matsuura et al.
patent: 4897455 (1990-01-01), Welborn
patent: 4960741 (1990-10-01), Bailly et al.
patent: 5026797 (1991-06-01), Takahashi

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