Abstract: A process for preparing thixotropic agents comprising from 0.1 to 30% by weight of at least one ethylene terpolymer wax, from 5 to 70% by weight of at least one first solvent incompatible with the ethylene terpolymer wax, and from 5 to 85% by weight of at least one solvent compatible with the ethylene terpolymer wax and with said first solvent(s).

Abstract: The invention relates to a process for preparing a catalyst for the polymerization of olefins, which comprises: a) preparation of a finely divided silica xerogel, b) loading of the xerogel with chromium from a solution of chromium trioxide or a chromium compound which is converted into chromium trioxide under the conditions of step c), and c) activation of the resulting product at from 400 to 1100° C. in a water-free gas stream comprising oxygen in a concentration of above 10% by volume, wherein a fluoride doping with a fluorinating agent is carried out in step b) or in step c). Furthermore, the invention relates to a catalyst for the polymerization of olefins which is obtainable by the process of the invention and to a process for the polymerization of olefins in which an olefin or an olefin mixture is polymerized in the presence of a catalyst according to the invention.

Abstract: In a process for the polymerization of ethylene and optionally further monomers in a high-pressure reactor at from 120 to 350° C. and pressures of from 1000 to 4000 bar, hydrogen is intermittently introduced into the reactor.

Abstract: Printing inks and paints comprising a polyolefin wax component prepared from one or more olefins by catalysis using a single-site catalyst based on a complex of a transition metal from groups 5 to 8 of the Periodic System of the Elements, which comprises not more than one cyclopentadienyl system per transition metal.

Abstract: Solvent-containing pastes comprising a polyolefin wax component prepared from one or more olefins by catalysis using a single-site catalyst based on a complex of a transition metal from groups 5 to 8 of the Periodic System of the Elements, and use of these pastes.

Abstract: An ethylene terpolymer wax comprising, as monomer building blocks, from 35 to 95% by weight of ethylene, from 0.1 to 40% by weight of at least one ester of the formula I where R1 is selected from hydrogen, C1-C10-alkyl, C3-C12-cycloalkyl and C6-C14-aryl R2 are identical or different and are selected from hydrogen and C1-C10-alkyl, R3 is selected from C1-C10-alkyl, C3-C12-cycloalkyl and C6-C14-aryl and n is an integer from 2 to 100, and from 0.1 to 25% by weight of at least one carboxylic acid of the formula II where R4 is selected from hydrogen, C1-C10-alkyl, C3-C12-cycloalkyl and C6-C14-aryl.

Abstract: Pigment concentrates comprising at least one pigment and one polyolefin wax prepared from one or more olefins by catalysis with a single-site catalyst comprising a transition metal of groups 5 to 8 of the Periodic Table, where the complex contains not more than one cyclopentadienyl system per transition metal atom, the concentrates comprising a thermoplastic, if desired, and additives, if desired.

Abstract: Oxidized waxes which are prepared by oxidizing polyolefins obtained by single-site catalysis of transition metal complexes from groups 5 to 8 of the Periodic Table of the Elements and have a molecular weight Mw in the range from 1000 to 40,000 g/mol.

Abstract: A process for preparing ethylene polymers by the high-pressure method comprises dissolving one or more free-radical initiators in one or more ketones of the formula I where R1 and R2 are identical or different and are selected from among C1-C6-alkyl and C3-C12-cycloalkyl and R1 and R2 may also be covalently linked to one another to form a 4- to 13-membered ring, prior to the polymerization, compressing the solution, metering it into the polymerization reactor at one or more points and subsequently carrying out the polymerization at from 150 to 380° C. and from 500 to 4500 bar.

Abstract: Pigment concentrates comprising at least one pigment, a polyethylene wax prepared from one ethylene and, if desired, one comonomer using a metallocene catalyst, if desired a thermoplastic polymer and, if desired, additives can be used to color plastic moldings and plastic sheets.

Abstract: A process for preparing ethylene polymers by the high-pressure method comprises dissolving one or more free-radical initiators in one or more ketones of the formula I 1

Abstract: In a process for the polymerization of ethylene and optionally further monomers in a high-pressure reactor at from 120 to 350° C. and pressures of from 1000 to 4000 bar, hydrogen is intermittently introduced into the reactor.

Abstract: Copolymers of ethylene have from 1 to 30 mol % of alkyl(meth)acrylates and, if desired, other comonomers, and have a residual comonomer content of less than 0.5% by weight in the copolymer. A process for preparing copolymers of this type in a combination of stirred autoclave and tubular reactor is described, as is the use of the copolymers for preparing polyamide molding compositions.

Abstract: An ethylene terpolymer wax comprising

Abstract: Pigment concentrates comprising at least one pigment and one polyolefin wax prepared from one or more olefins by catalysis with a single-site catalyst comprising a transition metal of groups 5 to 8 of the Periodic Table, where the complex contains not more than one cyclopentadienyl system per transition metal atom, the concentrates comprising a thermoplastic, if desired, and additives, if desired.

Abstract: Cosmetic preparations comprising polyethylene waxes having improved organoleptic properties

Abstract: The invention relates to a method for producing ethylene homopolymers and copolymers in a tubular reactor having at least two polymerisation zones, at temperatures of between 150° C. and 350° C. and pressures of between 500 and 5000 bar, using oxygen as an initiator. Said method is characterised in that at least one aliphatic ketone of general formula (I) is used as a molar mass regulator. The variable R1 in formula (I) represents a C1-C6 alkyl or a C3-C12-cycloalkyl. The invention also relates to ethylene homopolymers and copolymers that can be obtained using the inventive method and the use of the same for producing injection-moulded products in the fields of cosmetics, medicine and food.

Abstract: In a process for producing Phillips catalysts in which an oxidic support material is treated in suspension with a chromium salt solution and subsequently, after removing the solvent, calcined in an oxygen-containing atmosphere at above 300° C., the oxidic support material and/or the catalyst after calcination are/is, according to the present invention, comminuted until a mean particle size of <100 &mgr;m has been reached and the proportion of particles having a size of <50 &mgr;m is at least 30%, preferably in the range from 40 to 80%. A process for preparing homopolymers or copolymers of ethene in a loop reactor at from 30 to 150° C. under a pressure in the range from 0.2 to 15 MPa in the presence of a catalyst produced by the process of the present invention is also provided.

Abstract: The invention relates to a process for preparing a catalyst for the polymerization of olefins, which comprises:

Abstract: Printing inks and paints comprising a polyolefin wax component prepared from one or more olefins by catalysis using a single-site catalyst based on a complex of a transition metal from groups 5 to 8 of the Periodic System of the Elements, which comprises not more than one cyclopentadienyl system per transition metal.