Abstract: A process for producing a solvent mixture comprising (A) at least one compound of formula (I) (B) at least one compound of formula (II a) or (II b) (C) optionally at least one additive selected from aromatic compounds, sultones and exo-methylene ethylene carbonates, melamine, urea, organic phosphates and halogenated organic carbonates, (D) optionally at least one lithium salt, and from 3 to 30 weight ppm of water, which process comprises (a) components (A), (B) and, if used, (C) being mixed with one another, (b) dried over at least one ion exchanger or molecular sieve, (c) separated from ion exchanger or, respectively, molecular sieve, and (d) at least one lithium salt, if used, being added, where the variables are defined as follows: R1, R2 are each the same or different and selected from C1-C4-alkyl, R3 is selected from hydrogen and C1-C4-alkyl.

Abstract: horny substances are removed from hides of dead animals by a process wherein the hides of dead animals are treated with at least one substance of the formula I or at least one corresponding alkali metal, alkaline earth metal, ammonium or phosphonium salt, where R1 and R4 are identical or different and are selected from hydrogen, C6-C14-aryl and C1-C12-alkyl, unsubstituted or substituted by one or more SH or OH groups, R2 and R3 are identical or different and are selected from hydrogen, C6-C14-aryl and C1-C12-alkyl, unsubstituted or substituted by one or more SH or OH groups, at least one radical R2 or R3 not being hydrogen or R1 and R4 not being hydrogen, and it being possible in each case for two vicinal radicals R1 to R4 together to be C3-C10-alkylene, R5 is selected from hydrogen, C1-C12-alkyl, H—C?O or C1-C4-alkyl-C?O, X1, X2, X3 and X4 are selected from OH, SH and NHR5, where, if R1 to R4 contain at least one sulfur atom, at least one radical X1 to X4 is SH, and, if R1 to R4 contain no sulf

Abstract: A catalyst solid for olefin polymerization comprising A) at least one magnesium halide, B) at least one metallocene complex and C) at least one compound capable of forming metallocenium ions, is prepared by i) firstly preparing finely divided support particles consisting of the magnesium halide A) and an C1-C8-alcohol having a mean particle diameter of from 1 to 200 ?m from an adduct of the magnesium halide A) and a C1-C8-alcohol, where the adduct contains from 1.5 to 5 mol of the C1-C8-alcohol per mole of magnesium halide, ii) then depositing the compound C) capable of forming metallocenium ions on the finely divided support particles and iii) subsequently bringing the reaction product hereby obtained into contact with the metallocene complex B). This catalyst solid can be used for the polymerization or copolymerization of olefins.

Abstract: In a process for preparing a metal-containing supported catalyst or a metal-containing supported catalyst component by impregnation of a support material with an impregnation solution comprising the metal component, the impregnation solution flows through the support material.

Abstract: A catalyst solid for olefin polymerization comprising

Abstract: In a process for preparing a metal-containing supported catalyst or a metal-containing supported catalyst component by impregnation of a support material with an impregnation solution comprising the metal component, the impregnation solution flows through the support material.

Abstract: The invention relates to a method for producing a supported catalyst which contains metal, or a supported catalyst constituent which contains metal by impregnating a supporting material with an impregnating solution containing the metal constituent, whereby the impregnating solution flows through the supporting material.

Abstract: Catalyst system suitable for polymerizing unsaturated monomers and comprising active constituents obtainable by reacting A) a transition metal compound with B) aluminum trifluoride, C) a cation-forming compound and, if desired, D) further components.

Abstract: Racemic metallocene complexes are prepared by reacting bridged or unbridged transition metal complexes with cyclopentadienyl derivatives of alkali metals or alkaline earth metals and, if desired, subsequently replacing the aromatic ligands.

Abstract: A process for preparing a compound of the formula I where R1 and R2 are hydrogen or C1-C4-alkyl and R3 is C1-C10-alkyl, phenyl or C1-C4-alkyl-substituted phenyl, comprises reacting a compound II with a compound of the formula III where X is chlorine, bromine or iodine, in the presence of a Friedel-Crafts catalyst in one step to give a compound I.

Abstract: The present invention relates to a process for preparing racemic ansa-metallocene complexes I ##STR1## tin compounds II ##STR2## and a process for preparing tin compounds II. R.sup.1 to R.sup.9, M, and X are defined herein.