Wacker-chemie Gmbh

Dieter Kurz

Alex Sabel

Johann Bauer

Dieter Kippe

Erich Manner

Siegmund Maier

Anton Hundmeyer

Gottfried Piekarski

Herbert Kandler

Poly-.alpha.-olefins, particularly polyethylene, having a broad molecular weight distribution, can be prepared discontinuously or continuously in the gaseous phase or in hydrocarbons as dispersants, at a pressure of from 2 to 40 bar and at a temperature of from 60.degree. C. to 100.degree. C., optionally with the use of hydrogen as a molecular weight regulator in the presence of a catalyst solid which is manufactured in two reaction steps, from a primary solid containing magnesium and chlorine which has been reacted, in a reaction stage A, with peroxy compound(s) and with halogen-containing metal compounds of elements of IV and/or V sub-group(s) of the Mendeleev Periodic Table and, in reaction stage B, with halogen-containing metal compounds of elements of IV and/or V subgroup(s) of the Mendeleev Periodic Table, and/or metal organyl compounds of metals of the II and/or III main group(s) of the Mendeleev Periodic Table. The sequence of the reaction stages A and B is not critical for the success of the process according to the invention.

Process and catalyst for the polymerization of .alpha.-olefins

Poly-.alpha.-olefins, particularly polyethylene, having a broad molecular-weight distribution, can be prepared in the presence of a catalyst solid which is manufactured in two reaction steps, from a primary solid containing magnesium and chlorine which has been reacted, in a reaction stage A, with secondary and/or tertiary alcohols and with halogen-containing metal compounds of elements of IV and/or V sub-group(s) of the Mendeleev Periodic Table, and, in a reaction stage B, with halogen-containing metal compounds of elements of IV and/or V sub-group(s) of the Mendeleev Periodic Table and metal organyl compounds of metals of the II and/or III main group(s) of the Mendeleev Periodic Table. The sequence of the reaction stages A and B is not critical for the success of the process according to the invention.

Process and heavy metal catalyst for the polymerization of

Poly-.alpha.-olefins, particularly polyethylene, having a broad molecular-weight distribution, can be prepared in the presence of a catalyst solid which is manufactured in two reaction steps, from a primary solid containing magnesium and chlorine which has been reacted, in a reaction stage A, with alkoxy compounds of elements of Groups I to VI of the Mendeleev Periodic Table which contains at least one secondary or tertiary alkoxy group, and with halogen-containing metal compounds of elements of IV and/or V sub-group(s) of the Mendeleev Periodic Table and, in reaction stage B, with halogen-containing metal compounds of elements of IV and/or V sub-group(s) of the Mendeleev Periodic Table, and/or metal organyl compounds of metals of the II and/or III main group(s) of the Mendeleev Periodic Table. The sequence of the reaction stages A and B is not critical for the success of the process according to the invention.

Improved catalyst and method for the manufacture of polyethylene comprising a catalyst based on a solid substance containing titanium, magnesium and chlorine activated by aluminum alkyls or reaction products of dialkyl aluminum hydrides with diolefins having from 4 to 20 carbon atoms, and its use in the manufacture of polyethylene where said solid substance is produced by (1) reacting metallic magnesium with at least 2 mols of allyl chloride and at least 1.75 mols of a di-lower alkyl ether, per gram-atom of magnesium at a temperature between about 30.degree. C and about 100.degree. C, (2) aging the solid reaction product for at least 10 hours at a temperature between about 30.degree. C and about 140.degree. C, (3) treating the solid reaction product either together, or subsequent to the aging step, with at least 0.2 mols of a di-lower alkyl sulfite, per gram-atom of magnesium, (4) reacting the aged and treated solid reaction product with at least 0.5 mols of

Catalyst and process for the manufacture of polyethylene

A catalyst for the preparation of low-pressure polyethylene comprising the reaction product, at a temperature of from 0.degree. to 100.degree. C, of

Catalyst and process for the preparation of low-pressure polyethylene

Copolymers of vinyl chloride and 2-hydroxypropyl-alkyl maleate and/or fumarate consisting of a copolymer with from 65% to 95% by weight of vinyl chloride monomer units and from 5% to 35% by weight of 2-hydroxypropyl-alkyl maleate and/or fumarate monomer units, where alkyl has from 8 to 18 carbon atoms and is preferably branched, optionally with up to 15% of a dialkyl maleate and/or fumarate monomer units, where each alkyl has from 8 to 18 carbon atoms, said copolymer having a K-value of from 20 to 50 measured in cyclohexanone, as well as the method of producing the same by continuous addition of the monomer mix to an aqueous emulsion.

Copolymers of vinyl chloride and 2-hydroxypropyl-alkyl maleate

Vinyl chloride terpolymers soluble in aromatic compounds with a K-value of from 25 to 38, measured in cyclohexanone consisting of an emulsion polymerized monomer mixture of from

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Burghausen, Germany

Dieter Kurz