Process for the production of polyolefins and a catalyst for car

Details Process for the production of polyolefins and a catalyst for car Process for the production of polyolefins and a catalyst for car

1996-08-05

1998-05-26

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526227, 526308, 526352, 502152, 502160, C08F 434, C08F 202, C08F11002

Patent

active

057566160

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention concerns a process for producing polyolefins by polymerizing an .alpha.-olefin in the presence of a peroxide catalyst and a catalyst for carrying out this process.
Processes are known for the production of polyolefins by polymerizing .alpha.-olefins in the presence of a peroxide catalyst.
DE-A-3322329 describes a process for the production of polyethylene by polymerization of ethylene and a copolymerizable monomer in the presence of a catalyst composed of a transition metal derivative and an organoaluminium derivative in which an organic peroxide is added to the polymerization product when it is led away from the reaction zone in order to thereby deactivate the remaining catalyst.
JP-B-79031039 describes the (co)polymerization of aliphatic .alpha.-olefins using a catalyst system which is composed of trialkylaluminium, an electron donor and a peroxide.
D. Yatsu et al., American Chemical Society, Division of Polymer Chemistry, Polymer Preprints, Vol. 16, No. 1, April 1975, pages 373 to 378 describe the copolymerization of ethylene and vinyl acetate in the presence of a three component catalyst system composed of AlEt3, a Lewis base and a peroxide.
The object of the present invention is to provide an economic process for the polymerization of .alpha.(-olefins in the presence of a peroxide catalyst with which it is possible to achieve an improvement in the polymer yield per unit of peroxide weight used.
This object is achieved with the present invention.


THE INVENTION

The invention concerns a process for the production of polyolefins by polymerization of .alpha.(-olefins in the presence of a peroxide catalyst. The catalyst system is composed of components (A) and (B) wherein: organoaluminium compounds of formula AlR3 in which R represents an alkyl, alkenyl, aryl or cycloalkyl group; and
A further subject matter is a catalyst system for use in a process for the production of polyolefins by homopolymerization of a .alpha.-monoolefins or alicyclic monoolefins in mass e.g. for use in the process according to the invention which is characterized in that it is composed of the components (A) and (B) in which: organoaluminium compounds of formula AlR3 in which R represents an alkyl, alkenyl, aryl or cycloalkyl group; and
The polymerization is preferably carried out at a pressure of .gtoreq.500 bar and preferably between 500 and 3000 bar. The polymerization temperature is preferably between 0 and 300.degree. C. and preferably between 100 and 250.degree. C.
In the catalyst system composed of components (A) and (B), the amount of component (A) is preferably ca. 0.001 to 100 mol, calculated as monomeric organoaluminium compound relative to 1 mol of the monomer used. The amount of the catalyst component (B) is preferably ca. 0.01 to 100 mol per mol of the catalytic component (A).
The polymerization can be carried out in a well-known manner for the polymerization of .alpha.-olefins in the presence of a catalyst, in particular in the presence of a peroxide catalyst and the polymer can be isolated in a well-known manner. In general the polymerization is carried out in mass. The polymerization is a homopolymerization.
Surprisingly it was found that when using the catalyst system according to the invention, the peroxide consumption in the polymerization of .alpha.-olefins initiated by organic peroxides can be lowered i.e. the polymer yield per unit of peroxide weight can be considerably improved.
The catalyst system composed of the catalytic components (A) and (B) is added to the monomers as a substance or in solution in which the individual catalytic components (A) and (B) can be added separately. In this process the catalyst components can be fed into the reaction zone at the same time or continuously at a low concentration; specifically the components can be added as such or in solution.
The reaction can be carried out continuously or discontinuously. The well-known reactor types for such a polymerization come into consideration as reactor types such as e.g. flow tube, stirred ve

REFERENCES:
patent: 3156675 (1964-11-01), Ehmann et al.
patent: 3198780 (1965-08-01), Mortimer et al.
patent: 3579491 (1971-05-01), Carrega

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