Patents by Inventor Michael Kroener
Michael Kroener has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 5290880Abstract: N-vinylformamide is polymerized with or without other water-soluble monoethylenically unsaturated monomers and with or without water-insoluble monoethylenically unsaturated monomers in not less than 30% strength by weight aqueous monomer solutions in the presence of a polymerization initiator at not more than 150.degree. C. in a kneader by a method in which the polymerization is carried out to such an extent that the initially formed water-containing polymer gel disintegrates into fine particles and the finely divided polymer obtainable in this manner is hydrolyzed, preferably in the kneader, so that not less than 0.1 mol % of the N-vinylformamide units present in the polymer are converted into vinylamine units. The polymers obtainable in this manner dissolve readily in water. The aqueous solutions are used, for example, in papermaking and tertiary oil production.Type: GrantFiled: February 27, 1991Date of Patent: March 1, 1994Assignee: BASF AktiengesellschaftInventors: Dietmar Moench, Michael Kroener, Enrique Freudenberg, Heinrich Hartmann, Norbert Sendhoff
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Patent number: 5155270Abstract: Poly-N-vinylformamide which contains structural units of the formula ##STR1## and a terminal double bond of the formula ##STR2## is prepared by anionic polymerization of N-vinylformamide in the presence of bases.Type: GrantFiled: September 4, 1991Date of Patent: October 13, 1992Assignee: BASF AktiengesellschaftInventors: Rolf Fikentscher, Michael Kroener
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Patent number: 5145559Abstract: Paper, board and cardboard are produced by draining a paper stock, containing undesirable substances, in the presence of hydrolyzed homo- and/or copolymers of N-vinylformamide having a degree of hydrolysis of not less than 60% and a cationic retention aid. According to the invention, faster drainage and improved retention are obtained compared with the use of known fixing agents.Type: GrantFiled: January 16, 1991Date of Patent: September 8, 1992Assignee: BASF AktiengesellschaftInventors: Werner Auhorn, Friedrich Linhart, Primoz Lorencak, Michael Kroener, Norbert Sendhoff, Walter Denzinger, Heinrich Hartmann
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Patent number: 5126395Abstract: Stable water-in-oil emulsions of a hydrolyzed polymer of an N-vinylamide of the formula ##STR1## where R and R.sup.1 are each H or C.sub.1 -C.sub.6 -alkyl, are prepared by polymerizing a compound of the formula I, alone or as a mixture with other monoethylenically unsaturated monomers, in the form of a water-in-oil emulsion to give a water-in-oil polymer emulsion, and then hydrolyzing the polymer, hydrolysis of the polymer in the form of the water-in-oil polymer emulsion being carried out in the presence of an acid or base, and additives in the form of antioxidants, reducing agents or aldehyde acceptors being added for stabilization.Type: GrantFiled: February 28, 1990Date of Patent: June 30, 1992Assignee: BASF AktiengesellschaftInventors: Lutz End, Walter Denzinger, Michael Kroener, Norbert Sendhoff, Enrique Freudenberg, Friedrich Linhart, Rolf Fikentscher, Heinrich Hartmann
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Patent number: 5098521Abstract: Paper, board and cardboard are produced from paper stocks containing foreign substances by drainage in the presence of a polymer which contains, as typical polymerized constituents, units of the formulae ##STR1## where R.sup.1 and R.sup.2 are each H, C.sub.1 -C.sub.3 -alkyl, and which have K values of not less than 130, the polymers containing less than 10 mol % of units of the formula II.Type: GrantFiled: January 9, 1991Date of Patent: March 24, 1992Assignee: BASF AktiengesellschaftInventors: Enrique Freudenberg, Friedrich Linhart, Rainer Tresch, Heinrich Hartmann, Walter Denzinger, Michael Kroener, Norbert Sendhoff
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Patent number: 5077427Abstract: A process for preparing .alpha.-formylamino nitriles of the formula I ##STR1## where R.sup.1 and R.sup.2 are each hydrogen or unsubstituted or substituted, with substituents which are inert under the reaction conditions, aliphatic or heteroaliphatic radicals with 1 to 10, cycloaliphatic or heterocycloaliphatic radicals with 3 to 6, araliphatic radicals with 7 to 12, heteroaraliphatic radicals with 4 to 12, aromatic radicals with 6 to 10 or heteroaromatic radicals with 3 to 10 carbon atoms, by reacting cyanohydrins of the formula II ##STR2## with the formamide III ##STR3## in the presence of acids, entails adding at least one ammonium salt to the reaction mixture.Type: GrantFiled: December 13, 1990Date of Patent: December 31, 1991Assignee: BASF AktiengesellschaftInventors: Rolf Fikentscher, Michael Kroener
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Patent number: 5077426Abstract: A process for preparing .alpha.-formylamino nitriles of the formula Ia ##STR1## and Ib ##STR2## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are identical or different and each is hydrogen or unsubstituted or substituted, with substituents which are inert under the reaction conditions, aliphatic or heteroaliphatic radicals with 1 to 10, cycloaliphatic or heterocycloaliphatic radicals with 3 to 6, araliphatic radicals with 7 to 12, heteroaraliphatic radicals with 4 to 12, aromatic radicals with 6 to 10 or heteroarometic radicals with 3 to 10 carbon atoms, with the priviso that at least one of R.sup.1 and R.sup.2 or R.sup.3 and R.sup.4 is hydrogen, comprises reacting an iminodiacetonitrile of the formula II ##STR3## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 have the abovementioned meanings, with formamide of the formula III ##STR4## in the presence of formic acid or with a compound which provides formic acid, in the presence of acids.Type: GrantFiled: December 13, 1990Date of Patent: December 31, 1991Assignee: BASF AktiengesellschaftInventors: Rolf Fikentscher, Michael Kroener
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Patent number: 5008321Abstract: Stable water-in-oil emulsions of hydrolyzed polymers of N-vinylamides of the formula ##STR1## where R and R.sup.1 are each H or C.sub.1 -C.sub.6 -alkyl are prepared by polymerization of a compound of the formula I alone or as a mixture with other monoethylenically unsaturated monomers, in the form of a water-in-oil emulsion, to give a water-in-oil polymer emulsion, and subsequent hydrolysis of the polymer, by a process in which hydrolysis of the polymer in the form of the water-in-oil polymer emulsion is carried out in the presence of an acid or base and of from 1 to 30% by weight, based on the polymer, of an emulsifier which is obtainable by(A) reacting a C.sub.10 -C.sub.22 -fatty alcohol with epichlorohydrin in a molar ratio of from 1:0.5 to 1:1.5 to give a glycidyl ether,(B) reacting the glycidyl ether with (1) a saturated C.sub.2 -C.sub.6 -alcohol containing from 2 to 6 OH groups or (2) its monoether with a C.sub.10 -C.sub.22 -fatty alcohol, in a molar ratio of glycidyl ether to (1) or (2) of from 1:0.Type: GrantFiled: November 20, 1989Date of Patent: April 16, 1991Assignee: BASF AktiengesellschaftInventors: Heinrich Hartmann, Walter Denzinger, Michael Kroener, Norbert Sendhoff, Enrique Freudenberg
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Patent number: 4978427Abstract: Water-soluble copolymers containing copolymerized vinylamine units are prepared by copolymerizing (a) from 95 to 10 mol % of N-vinylformamide and (b) from 5 to 90 mol % of an ethylenically unsaturated monomer from the group consisting of vinyl acetate, vinyl propionate, C.sub.1 -C.sub.4 -alkyl vinyl ethers, the esters, nitriles and amines of acrylic acid and methacrylic acid and N-vinylpyrrolidone, and then eliminating from 30 to 100 mol % of the formyl groups from the copolymer. Preferred copolymers are copolymers of N-vinyl-formamide and vinyl acetate, in which from 30 to 100 mol % of the monomer units are hydrolyzed. The copolymers are used in papermaking to increase the dry strength and wet strength of the paper.Type: GrantFiled: September 5, 1989Date of Patent: December 18, 1990Assignee: BASF AktiengesellschaftInventors: Sigberg Pfohl, Michael Kroener, Heinrich Hartmann, Walter Denzinger
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Patent number: 4940514Abstract: Paper, board, and cardboard having high dry strength are made by adding to the paper stock a dry strength agent which is obtainable by mixing enzymatically digested starch having a viscosity of from 20 to 2,000 mPa.s (measured in 7.5% strength aqueous solution at 45.degree. C.) and a cationic polymer which contains, as typical copolymerized monomers,(a) diallyldimethylammonium chloride,(b) N-vinylamine or(c) an unsubstituted or substituted N-vinylimidazoline, the K value of the cationic polymer in each case being not less than 30, and draining the paper stock with sheet formation.Type: GrantFiled: July 25, 1988Date of Patent: July 10, 1990Assignee: BASF AktiengesellschaftInventors: Andreas Stange, Hans-Juergen Degen, Werner Auhorn, Volkmar Weberndoerfer, Michael Kroener, Heinrich Hartmann
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Patent number: 4880497Abstract: Water-soluble copolymers containing copolymerized vinylamine units are prepared by copolymerizing (a) from 95 to 10 mol % of N-vinylformamide and (b) from 5 to 90 mol % of an ethylenically unsaturated monomer from the group consisting of vinyl acetate, vinyl propionate, C.sub.1 -C.sub.4 -alkyl vinyl ethers, the esters, nitriles and amides of acrylic acid and methacrylic acid and N-vinylpyrrolidone, and then eliminating from 30 to 100 mol % of the formyl groups from the copolymer. Preferred copolymers are copolymers of N-vinylformamide and vinyl acetate, in which from 30 to 100 mol % of the monomer units are hydrolyzed. The copolymers are used in papermaking to increase the dry strength and wet strength of the paper.Type: GrantFiled: April 29, 1988Date of Patent: November 14, 1989Assignee: BASF AktiengesellschaftInventors: Sigberg Pfohl, Michael Kroener, Heinrich Hartmann, Walter Denzinger
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Patent number: 4859642Abstract: A novel fixed-bed catalyst structure obtained using honeycomb elements, for highly exothermic and endothermic chemical reactions, wherein the required heat exchange, both in the liquid phase and in the gas phase, is forcibly effected in the fixed catalyst bed by means of static mixing elements made of inert ceramic and/or metallic material or completely of catalyst material, between the individual honeycomb elements.Type: GrantFiled: June 18, 1986Date of Patent: August 22, 1989Assignee: BASF AktiengesellschaftInventors: Wolfgang Hoelderich, Michael Kroener, Peter Kroetzsch, Werner Biffar
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Patent number: 4818341Abstract: Paper and paperboard of high dry strength are produced by adding a dry strength enhancer to the paper stock and dewatering the paper stock with sheet formation by using as the dry strength enhancer a mixture of a cationic polymer which contains as characteristic monomers copolymerized units of(a) diallyldimethylammonium chloride,(b) N-vinylamine or(c) a substituted or unsubstituted N-vinylimidazoline and has a K value of not less than 30, and natural potato starch which is converted into a water-soluble form by heating in an aqueous medium at above the gelatinization temperature of natural potato starch in the absence of any oxidizing agents or alkali.Type: GrantFiled: February 12, 1988Date of Patent: April 4, 1989Assignee: BASF AktiengesellschaftInventors: Hans-Juergen Degen, Sigberg Pfohl, Volkmar Weberndoerfer, Gerd Rehmer, Michael Kroener, Andreas Stange
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Patent number: 4814505Abstract: N-Vinylformamide is purified by fractional distillation in the presence of formamide in a column under from 0.5 to 30 mbar by a method in which the distillation is controlled so that N-vinylformamide containing from 0.1 to 15% by weight of formamide is obtained as the distillate. Homopolymers having particularly high molecular weights can be prepared from the N-vinylformamide purified in this manner.Type: GrantFiled: January 29, 1987Date of Patent: March 21, 1989Assignee: Basf AktiengesellschaftInventors: Michael Kroener, Willi Schmidt, Alfred Oftring, Theo Proll, Heinrich Hartmann
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Patent number: 4774285Abstract: Water-soluble copolymers containing copolymerized vinylamine units are prepared by copolymerizing (a) from 95 to 10 mol % of N-vinylformamide and (b) from 5 to 90 mol % of an ethylenically unsaturated monomer from the group consisting of vinyl acetate, vinyl propionate, C.sub.1 -C.sub.4 -alkyl vinyl ethers, the esters, nitriles and amides of acrylic acid and methacrylic acid and N-vinylpyrrolidone, and then eliminating from 30 to 100 mol % of the formyl groups from the copolymer. Preferred copolymers are copolymers of N-vinylformamide and vinyl acetate, in which from 30 to 100 mol % of the monomer units are hydrolyzed. The copolymers are used in papermaking to increase the dry strength and wet strength of the paper.Type: GrantFiled: September 15, 1986Date of Patent: September 27, 1988Assignee: BASF AktiengesellschaftInventors: Sigberg Pfohl, Michael Kroener, Heinrich Hartmann, Walter Denzinger
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Patent number: 4772359Abstract: Paper, board and cardboard are produced by draining a pulp slurry in the presence of high molecular weight, water-soluble polymers of N-vinylamides as drainage aids, retention agents and flocculants. These polymers are particularly effective in a pulp slurry which has a high content of interfering substances and other phenolic compounds.Type: GrantFiled: May 29, 1987Date of Patent: September 20, 1988Assignee: BASF AktiengesellschaftInventors: Friedrich Linhart, Hans-Juergen Degen, Werner Auhorn, Michael Kroener, Heinrich Hartmann, Wilfried Heide
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Patent number: 4745207Abstract: Reaction products of hydrogen cyanide are prepared by a process in which hydrogen cyanide prepared in a conventional manner by pyrolysis at from 250.degree. to 650.degree. C. over a solid under from 5 to 200 mbar is cooled to a temperature of from 200.degree. to -10.degree. C. together with the other pyrolysis products, the hydrogen cyanide is then fed to a chemisorption reaction with a base or with a carbonyl compound, and the reaction products of hydrogen cyanide which are formed therein are removed from the system and brought to atmospheric pressure. In this process, the handling of large amounts of hydrogen cyanide is avoided.Type: GrantFiled: November 25, 1985Date of Patent: May 17, 1988Assignee: BASF AktiengesellschaftInventors: Fritz Brunnmueller, Karlheinz Stecher, Michael Kroener, Rolf Schneider
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Patent number: 4711930Abstract: A honeycomb catalyst consisting of from 30 to 95% by weight, calculated as Fe.sub.2 O.sub.3, of an iron compound and from 0.1 to 60% by weight, calculated as Al.sub.2 O.sub.3, CeO.sub.2 or Cr.sub.2 O.sub.3, of an aluminum, cerium and/or chromium compound and/or from 1 to 50% by weight of an alkali metal compound, in particular potassium, calculated as K.sub.2 O, and/or from 0.2 to 20% by weight, calculated as MeO.sub.3, of an element of sub-group 6, preferably MoO.sub.3 and WO.sub.3, and/or from 0.1 to 20% by weight, calculated as V.sub.2 O.sub.5, of a compound of vanadium and/or from 0.1 to 20% by weight, calculated as P.sub.2 O.sub.5, of a compound of phosphorus, a process for the preparation of the honeycomb catalyst, and the use of the catalyst for organic reactions.Type: GrantFiled: June 18, 1986Date of Patent: December 8, 1987Assignee: BASF AktiengesellschaftInventors: Wolfgang Hoelderich, Werner Biffar, Matthias Irgang, Wolf D. Mross, Michael Kroener, Eberhard Ambach
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Patent number: 4687848Abstract: Novel 2-aminopyrazines and processes for the preparation of 2-aminopyrazines and pyrazines by reaction of an .alpha.-iminodiacetonitrile (a) with a hydrogen halide or (b) with an alcohol or a thioalcohol and a hydrogen halide or (c) with an alcohol or a thioalcohol in the presence of an alkali metal compound and/of an alkaline earth metal compound. The 2-aminopyrazines and pyrazines obtainable by the process of the invention are useful starting materials for the preparation of dyes, fungicides, bactericides, textile assistants, scents, folic acid derivatives, flavorings, and active ingredients in crop protection and drugs.Type: GrantFiled: June 3, 1985Date of Patent: August 18, 1987Assignee: BASF AktiengesellschaftInventors: Fritz Brunnmueller, Michael Kroener
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Patent number: 4596889Abstract: A process for the preparation of an alkenyl-lactic acid ester by reaction of a cyanohydrin with an alcohol in the presence of hydrogen chloride, followed by hydrolysis. The compounds obtained may be used for the preparation of alkaloids and crop protection agents, and as monomers for copolymerization.Type: GrantFiled: February 22, 1985Date of Patent: June 24, 1986Assignee: BASF AktiengesellschaftInventors: Michael Kroener, Walter Goetze