Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1997-03-03
1999-10-26
Teskin, Fred
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526329, 526331, 502152, 502160, C08F21002, C08F 434, C08F 452
Patent
active
059730870
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention is concerned with a process for the production of ethylene co-polymers under elevated pressure with the use of a peroxide catalyst, as well as with a catalyst for carrying out this process.
Processes for the polymerisation of ethylenically-unsaturated monomers under elevated pressure and elevated temperature in the presence of a peroxide catalyst are known.
DE-A-3322329 describes a process for the production of polyethylene by the polymerisation of ethylene and a co-polymerisable monomer in the presence of a catalyst of a transition metal derivative and an organo-aluminium derivative in which an organic peroxide is added to the polymerisation product at the outlet from the reaction zone in order thereby to deactivate the residual catalyst.
JP-B-79031039 describes the (co)polymerisation of aliphatic .alpha.-olefins with the use of a catalyst system which consists of a trialkylaluminium, an electron donor and a peroxide.
D. Yatsu et al., American Chemical Society, Division of Polymer Chemistry, Polymer Reprints, Vol. 16, No. 1, April 1975, pages 373 to 378 described the co-polymerisation of ethylene and vinyl acetate in the presence of a three-component catalyst system of triethyl aluminium, a Lewis base and a peroxide.
NL-A-268 250 describes a low pressure co-polymerisation of olefins containing 2 to 4 carbon atoms with a vinyl ester. The process is carried out at a pressure of <70 ats and at a temperature of -80 to +60.degree. C. As catalyst, there is used a mixture of peroxide and an organo-aluminium compound.
It is an object of the present invention to provide an economic process for the co-polymerisation of ethylene with further polymerisable monomers in the presence of a peroxide catalyst at high pressures and a high temperature with which an improvement of the polymer yield per unit weight of peroxide used can be achieved.
THE INVENTION
According to the present invention, there is provided a process for the production of ethylene co-polymers under elevated pressure in the presence of a peroxide catalyst, wherein, as catalyst, there is used a catalyst system containing components (A) and (B), component (A) being at least one organo-aluminium compound of the general formula AlR.sub.3, in which R can be the same or different and is an alkyl, alkenyl, aryl, aralkyl or cycloalkyl radical and component (B) is at least one organic peroxide, the polymerisation being carried out at a pressure of 300 bar and at a temperature of 80.degree. C.
In a preferred embodiment of the invention, vinylacetate and/or methyl acrylate is used as co-monomer.
The present invention is also concerned with the use of a catalyst system in a high pressure polymerisation process for the production of polyolefins by polymerisation of .alpha.-olefins, for example for use in the process according to the present invention, wherein the catalyst system contains the components (A) and (B), the component (A) being at least one organo-aluminium compound of the general formula AlR.sub.3, in which R can be the same or different and is an alkyl, alkenyl, aryl, aralkyl or cycloalkyl radical and component (B) being at least one organic peroxide.
The polymerisation is preferably carried out at a pressure of 500 bar and especially at a pressure of from 1500 to 2500 bar. The polymerisation temperature is preferably from 80 to 300.degree. C. and especially from 100 to 250.degree. C.
In the catalyst system consisting of components (A) and (B) the amount of component (A) is preferably ca. 0.001 to 100 mol, calculated as monomeric organo-aluminium compound per mol of monomers used. The amount of catalyst component (B) is preferably ca. 0.01 to 100 mol per mol of catalyst component (A).
The amount ratio of catalyst mixture to monomer is preferably 10 to 250 mol of catalyst (A and B) per 10.sup.6 mol of monomer mixture and especially preferably 50 to 150 mol of catalyst per 10.sup.6 mol of monomer mixture.
As co-monomers, in the process according to the present invention, there can be used all monome
REFERENCES:
patent: 2396785 (1946-03-01), Hanford
patent: 3029230 (1962-04-01), Strauss
patent: 3156675 (1964-11-01), Ehmann et al.
patent: 3198780 (1965-08-01), Mortimer et al.
patent: 3579491 (1971-05-01), Carrega
patent: 4048425 (1977-09-01), Kuntz
patent: 4794004 (1988-12-01), Pfleger et al.
File 350:Derwent World Pat.; Oct. 4, 1979; Week 7944; JP79031039 Mitsui Petrochem Ind KK; Abstract: An aliphatic alpha-olefin (I) is co-polymerised using a catalyst system consisting of . . . .
Macromolecules, vol. 10, No. 2, Mar.-Apr. 1977; Ethylene-VAc Copolymerization by AIR.sub.3 -Lewis Base-Peroxide; pp. 249-253; T. Yatsu, S. Moriuchi, and H. Fujii; Copolymerization of Ethylene with Vinyl Acetate by Trialkylaluminum-Lewis Base-Peroxide Catalyst, Mitsui Petrochem Industries 1976.
000584258 WPI; NL 268250; Week 6801; Assignee-Farbwerke Hoechst AG; Abstract-Polymerisation process for the mfte. of a copolymer of an . . . .
Section Ch, Week 7944, Derwent Publications Ltd., London, GB; Class A17, AN 79-80223B & JP, B, 54 031 093 (Mitsui Petrochem Ind KK), Oct. 4, 1979.
Section Ch, Week 7542, Derwent Publications Ltd., London, GB; Class A18, AN 75-69460W & JP,A,49 124 190 (Mitsui Petrochem KK), Nov. 27, 1974.
Macromolecules, vol. 10, No. 2, Mar. 1977-Apr. 1977, pp. 249-253, Yatsu et al, `Copolymerization of Ethylene with Vinyl Acetate by Trialkylaluminum-Lewis Base-Peroxide Catalyst`.
Dorn Maximilian
Jabbari Majid
Luft Gerhard
Peroxid-Chemie GmbH
Teskin Fred
LandOfFree
Process for the production of ethylene co-polymers does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for the production of ethylene co-polymers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the production of ethylene co-polymers will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-765835