Basf Aktiengesellschaft

Dieter Oeder

Hans Gropper

Albert Hettche

Stefan Weiss

Walter Ziegler

Wolfram Dietsche

Guido Funk

Erich Kolk

Friedrich Urban

Manfred Daeuble

Peter Kueppers

The present invention relates to high molecular weight homopolymers and copolymers of ethene, which homopolymer or copolymer is obtained by polymerizing the monomer(s) at a temperature of from 70.degree. to 150.degree. C. and under a pressure of from 2 to 150 bar in contact witha chromium trioxide catalyst,

High molecular weight homopolymers and copolymers of ethene

The present invention relates to a novel catalyst for the preparation of high molecular weight homopolymers and copolymers of ethene, which catalyst is obtainable by

Catalyst for the preparation of high molecular weight homopolymers and

A lubricant for molding chlorine-containing thermoplastics, which contains ethylene/acrylic acid or ethylene/maleic acid copolymers esterified, in a molar ratio of carboxyl groups to alcoholic hydroxyl groups of from 1:0.2 to 1:1, with C.sub.1 -C.sub.20 -aliphatic alcohols which may or may not contain ether groups, the copolymers, prior to esterification, having a mean molecular weight of from 500 to 10,000 and containing from 2 to 15% by weight of acrylic acid or from 1 to 8% by weight of maleic acid as copolymerized units, the percentages being based on copolymer.

Lubricant, containing esterified ethylene/acrylic acid or

Water-emulsifiable hard waxes consisting of homogeneous copolymers of ethylene with from 1 to 8% by weight, based on copolymer, of one or more .alpha.-olefinically unsaturated C.sub.3 -C.sub.8 -carboxylic acids, and having the following characteristic data:

Emulsifiable hard waxes consisting of copolymers of ethylene with

Water-emulsifiable hard waxes consisting of homogeneous terpolymers of ethylene with--based on weight of terpolymer--from 1 to 8% by weight of C.sub.3 -C.sub.8 -olefinically unsaturated carboxylic acids and from 0.5 to 10% by weight of C.sub.1 -C.sub.12 -alkyl esters of such unsaturated carboxylic acids and having a Staudinger index, determined according to DIN 53,728, of from 5 to 55, an acid number of from 8 to 62 and a Hoppler hardness, measured by DFG standard method M-III-9a(57), at 23.degree. C., of from 250 to 800 bar, are obtained by copolymerizing ethylene with olefinically unsaturated C.sub.3 -C.sub.8 -carboxylic acids and esters of such acids with C.sub.1 -C.sub.12 -alkanols in a continuous process in the presence of a free radical initiator at from 150.degree. to 300.degree. C. under a pressure of from 1,000 to 3,000 bar, using a weight ratio of ethylene:acid:acrylate of from 500:1:1 to 20:1:1, in a one-phase polymerization medium in which the monomers are soluble, in the presence of from 0.01 to 8% by weight, based on the sum of the monomers, of a regulator, from 3 to 25% by weight of the ethylene being converted and the copolymer formed being removed continuously from the reaction zone.

Hard waxes comprising terpolymers of ethylene with unsaturated

Ethylene polymers are manufactured by polymerizing ethylene under high pressure at high temperatures in an autoclave reactor. The heat of reaction generated by the polymerization is removed, within the reactor, by a cooling system in which the cooling medium is ethylene; the pressure of the monomer in the cooling system should differ by from 0 to 200 bars from the pressure prevailing in the polymerization system, and the temperature of the monomer on entering the cooling system is at least 40.degree. C. lower than the temperature prevailing in the autoclave. The process permits an increase in the conversion achieved in the polymerization reaction.

Manufacture of ethylene polymers in an autoclave reactor

Ethylene polymers are produced at pressures between 1000 and 4000 atmospheres and temperatures of from 120.degree. to 300.degree. C in a reaction zone having an 1/d ratio of from 10:1 to 20:1 while shear forces act on the reaction mixture. The ethylene is fed continuously and radially to the reaction zone at a velocity of from 2 to 20 m/sec. The average residence time of the reaction mixture in the reaction zone is from 20 to 90 seconds. The products show a broad molecular weight distribution and are particularly advantageous for use as extruded coatings.

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Weisenheim, Germany

Dieter Oeder