# US 4,396,532 A · Activator comprising a dialkylaluminum monofluoride for the polymerization of ethylene

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- Number: US 4,396,532 A
- Document ID: US4396532A
- Status: Granted
- Kind: A
- Application number: 06/324,957
- Filed: 1981-11-25
- Granted: 1983-08-02
- Earliest claimed: 1981-11-25
- Assignees: Societe Chimique des Charbonnages S.A.
- Inventors: Karel Bujadoux
- Web page: https://patentgrep.com/patent/US4396532A

## CPC

- C08F 10/02: Ethene
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

A polymerization activator for polymerizing ethylene comprising a dialkylaluminum monofluoride mixed with minor amounts of at least one of dialkylaluminum hydride or halide and a trialkylaluminum. The activator preferably corresponds to the general formula (AlR.sub.2 F)(AlR.sub.2 H).sub.b (AlR.sub.3).sub.c or the general formula (AlR.sub.2 F)(AlR.sub.2 X).sub.a wherein R is an alkyl group having 1 to 12 carbon atoms, 0.1.ltoreq.b.ltoreq.0.4, 0.05.ltoreq.c.ltoreq.0.2, X is a halogen other than fluorine, and 0.1.ltoreq.a.ltoreq.0.4. The activator is used in a catalytic system including at least one halide of a transition metal of Group IVB to VIB, the valency of the metal in the halide being not more than 3 and the atomic ratio of aluminum in the activator to transition metal in the catalyst lying between 0.1 and 10. The catalytic system is used in a high pressure and temperature process for polymerizing or copolymerizing ethylene.

## Claims

### Claim 1

A polymerization activator comprising at least one organoaluminum compound selected from the group consisting of:
(i) compounds having the formula (AlR.sub.2 F)(AlR.sub.2 H).sub.b (AlR.sub.3).sub.c wherein R is an alkyl group having 1 to 12 carbon atoms, 0.1.ltoreq.b.ltoreq.0.4, and 0.05.ltoreq.c.ltoreq.0.2, and
(ii) compounds having the formula (AlR.sub.2 F)(AlR.sub.2 X).sub.a wherein R is an alkyl group having from 1 to 12 carbon atoms, X is a halogen other than fluorine, and 0.1.ltoreq.a.ltoreq.0.4.

### Claim 2 (depends on 1)

A polymerization activator according to claim 1, wherein X is chlorine.

### Claim 3 (depends on 1, 2)

A catalytic system for the polymerization of ethylene and the copolymerization of ethylene with an .alpha.-olefin having from 3 to 8 carbon atoms, comprising at least one organoaluminum activator compound and at least one halide of a transition metal of Group IV B to VI B of the Periodic System, the valency of said metal in said halide being not more than 3 and the atomic ratio of aluminum in the activator to transition metal in the catalyst lying between 0.1 and 10, wherein said activator is an activator according to claim 1 or 2.