# US 5,352,658 A · Phillips catalyst and its use for the preparation of ethylene homopolymers and copolymers

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- Number: US 5,352,658 A
- Document ID: US5352658A
- Status: Granted
- Kind: A
- Application number: 08/016,277
- Filed: 1993-02-11
- Granted: 1994-10-04
- Earliest claimed: 1992-02-13
- Assignees: BASF SE
- Inventors: Kaspar Evertz; Roland Saive; Guido Funk; Peter Koelle; Rainer Konrad; Hans Gropper
- Web page: https://patentgrep.com/patent/US5352658A

## CPC

- C08F 10/00: Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

A novel Phillips catalyst for the homopolymerization of ethylene and the copolymerization of ethylene with .alpha.-olefins contains, as a catalytically active component, a chromium catalyst supported on a finely divided aluminum silicate gel, modified with a fluoride and activated in an oxidizing atmosphere at elevated temperatures. The finely divided aluminum silicate gel (carrier gel) used here has an alumina content of from 0.5 to 6% by weight, the alumina being concentrated in the surface region of the carrier gel particles. The novel Phillips catalyst has high productivity and gives high molecular weight ethylene homopolymers and copolymers which have excellent low temperature impact strength and do not tend to swell in the blow molding process on emergence from the extruder die.

## Claims

### Claim 1

A Phillips catalyst for the homopolymerization of ethylene and the copolymerization of ethylene with .alpha.-olefins, which comprises: as a catalytically active component, a chromium catalyst supported on a finely divided aluminum silicate gel, modified with at least one fluoride and activated in an oxidizing atmosphere at elevated temperatures of from about 400.degree. to 1100.degree. C., the aluminum silicate gel (carrier gel) having an alumina content of from 0.5 to 6% by weight, the alumina being concentrated in the surface region of the carrier gel particles.

### Claim 2 (depends on 1)

A Phillips catalyst as defined in claim 1, wherein the alumina is concentrated at the surface of the pores of the carrier gel particles.

### Claim 3 (depends on 1)

A Phillips catalyst as defined in claim 1, wherein the pore volume of the carrier gel particles is from 0.8 to 1.5 m.sup.2 /g.

### Claim 4 (depends on 1)

A Phillips catalyst as defined in claim 1, wherein the specific surface area of the carrier gel particles is from 200 to 700 m.sup.2 /g.

### Claim 5 (depends on 1)

A Phillips catalyst as defined in claim 1, wherein the particle size of the carrier gel particles is from 1 to 300 .mu.m.

### Claim 6 (depends on 1)

A Phillips catalyst as defined in claim 1, wherein the fluoride used is ammonium fluoride, ammonium difluoride, ammonium tetrafluoborate, boron trifluoride, ammonium hexafluorophosphate or ammonium hexafluorosilicate.