Patents Assigned to Clariant GmbH
  • Synergistic flameproofing combination for polymers
    Patent number: 6207736
    Abstract: The present invention relates to a synergistic flameproofing combination for polymers, in particular for ABS, which contains, as component A, a phosphinic acid salt of the formulae (I) defined in the description and/or a diphosphinic acid salt of the formula (II) and/or polymers thereof and which contains, as component B, a nitrogen-containing phosphate or a mixture of the compounds defined by the formulae.
    Type: Grant
    Filed: August 4, 1998
    Date of Patent: March 27, 2001
    Assignee: Clariant GmbH
    Inventors: Bernd Nass, Wolfgang Wanzke
  • Laser marking of effect coatings
    Patent number: 6207240
    Abstract: The invention relates to a process for generating a marking on an effect coating or molding compound comprising cholesteric liquid-crystalline main-chain or side-group polymers or comprising a combination of main-chain and side-group polymers, which comprises inducing a color change at the irradiated sites of the effect coating or molding compound by laser irradiation.
    Type: Grant
    Filed: August 13, 1999
    Date of Patent: March 27, 2001
    Assignee: Clariant GmbH
    Inventors: Axel Schoenfeld, Andreas Stohr, Hans Joachim Metz
  • Process for the preparation of aqueous diazonium salt solutions
    Patent number: 6207809
    Abstract: An aqueous solution of diazonium salts is prepared in the absence of organic solvents by reducing a water-soluble aromatic nitro compound in aqueous solution with hydrogen and a hydrogenation catalyst to give the aromatic amino compound, and diazotizing this amino compound in the aqueous solution.
    Type: Grant
    Filed: May 2, 2000
    Date of Patent: March 27, 2001
    Assignee: Clariant GmbH
    Inventor: Bernd Nestler
  • Use of metal carboxylates and sulfonates as charge control agents
    Patent number: 6207335
    Abstract: Use of metal carboxylates and sulfonates as charge control agents Metal carboxylates and metal sulfonates are employed as charge control agents in electrophotographic toners and developers, as charge improvers in powder coating materials and electret materials, and in electrostatic separation processes.
    Type: Grant
    Filed: August 17, 1999
    Date of Patent: March 27, 2001
    Assignee: Clariant GmbH
    Inventors: Eduard Michel, Ruediger Baur, Hans-Tobias Macholdt
  • Synergistic mixtures of phosphoric esters with carboxylic acids or carboxylic acid derivatives as asphaltene dispersants
    Patent number: 6204420
    Abstract: The invention relates to a synergistic mixture of A from 5 to 99% by weight of a carboxylic acid having more than 4 carbon atoms, an ethercarboxylic acid containing C18-C22-alkyl, C18-C22-alkenyl or C6-C18-alkylaryl substituents, an amidocarboxylic acid, or mixtures thereof, B from 1 to 95% by weight of a phosphoric mono- or diester, or mixtures thereof, which is substituted by C18-C22-alkyl, C18-C22-alkenyl, C6-C18-alkylaryl or alkoxylated groups, where the sum of components A and B is 100% by weight, to crude oils containing such mixtures, and to a process for dispersing asphaltenes in crude oils.
    Type: Grant
    Filed: June 24, 1999
    Date of Patent: March 20, 2001
    Assignee: Clariant GmbH
    Inventors: Dennis Miller, Axel Vollmer, Michael Feustel, Peter Klug
  • Process for the preparation of paraoxadiazolyphenylboronic acids
    Patent number: 6197967
    Abstract: Compounds of the formula (I) are prepared by reacting a compound of the formula (V) with a compound of the formula (X) and hydrolyzing the product; or converting the compound of the formula (V) into the hydrazide, and cyclizing and hydrolyzing the latter to give the oxadiazole. para-Oxadiazolylphenylboronic acids are valuable precursors for active ingredients.
    Type: Grant
    Filed: December 13, 1999
    Date of Patent: March 6, 2001
    Assignee: Clariant GmbH
    Inventors: Frank Vollmueller, Steffen Haber, Andreas Meudt, Antje Noerenberg, Stefan Scherer
  • 4-hydroxyquinoline-3-carboxylic acid derivatives as light stabilizers
    Patent number: 6194493
    Abstract: The present invention relates to the use of compounds of the formula (I) where the substituents are as defined in the description as a stabilizer for organic material against the harmful effect of light, oxygen and heat.
    Type: Grant
    Filed: September 3, 1998
    Date of Patent: February 27, 2001
    Assignee: Clariant GmbH
    Inventors: Thomas Stährfeldt, Mathias Mehrer
  • Crystal modification of C.I. Pigment Red 53:2 (&ggr;-phase)
    Patent number: 6191263
    Abstract: The invention relates to a novel crystal modification (&ggr;-modification ) of C.I. Pigment Red 53:2 of the formula (1) having the following characteristic reflections in the X-ray powder diffraction pattern: 2&THgr; d Relative intensity in %  4.4 20.2  49  5.8 15.4  100   8.8 10.0  23 10.3 8.6 25 10.9 8.1 33 12.2 7.3 15 13.9 6.4 16 15.4 5.8 15 16.7 5.3 28 17.6 5.0 16 18.4 4.8 18 18.6 4.8 18 19.7 4.5 20 20.8 4.3 18 23.2 3.8 48 24.0 3.7 21 24.8 3.6 37 25.2 3.5 34 26.6 3.3 19 27.3 3.3 19 27.9 3.2 12 29.3 3.
    Type: Grant
    Filed: June 21, 1999
    Date of Patent: February 20, 2001
    Assignee: Clariant GmbH
    Inventors: Martin Ulrich Schmidt, Hans Joachim Metz
  • Two-step production of 3-chloro-4-fluoro-benzoyl chloride by chlorination
    Patent number: 6187952
    Abstract: The present invention relates to a process for the preparation of 3-chloro-4-fluorobenzoyl chloride which comprises reacting 4-fluorobenzaldehyde with a chlorinating agent in the presence of a free-radical initiator in the presence or absence of a solvent at from −20 to 200° C. to give 4-fluorobenzoyl chloride, and reacting the 4-fluorobenzoyl chloride with a chlorinating agent in the presence of a chlorination catalyst in the presence or absence of a solvent at from −20 to 200° C. to give 3-chloro-4-fluorobenzoyl chloride.
    Type: Grant
    Filed: December 10, 1998
    Date of Patent: February 13, 2001
    Assignee: Clariant GmbH
    Inventors: Ralf Pfirmann, Thomas Wessel
  • Infrared-reflecting colorants
    Patent number: 6180025
    Abstract: Colorant composition consisting essentially of one or more cholesteric liquid-crystalline polymers having a pitch of the helical superstructure of between 760 nm and 500 &mgr;m, and of at least one colorant which absorbs light in the visible wavelength range. Suitable colorants are organic or inorganic pigments or dyes. Coatings featuring such colorant compositions are notable for heat insulation properties.
    Type: Grant
    Filed: April 16, 1999
    Date of Patent: January 30, 2001
    Assignee: Clariant GmbH
    Inventors: Axel Schoenfeld, Andreas Stohr
  • Synergistic mixtures of alkylphenol-formaldehyde resins with oxalkylated amines as asphaltene dispersants
    Patent number: 6180683
    Abstract: The present invention relates to a synergistic mixture comprising, as asphaltene dispersant, from 5 to 95% by weight of a compound A of the formula I or II defined in the description, and from 5 to 95% by weight of a compound B of the formula (III) defined in the description, the substituents being defined as described in the description. The mixture is an excellent asphaltene dispersant in crude oils and products derived therefrom.
    Type: Grant
    Filed: March 9, 1998
    Date of Patent: January 30, 2001
    Assignee: Clariant GmbH
    Inventors: Dennis Miller, Michael Feustel, Axel Vollmer, Reinhard Vybiral, Dieter Hoffmann
  • Use of N-(3-dialkylamino) propyl-N-polyhydroxyalkylcarboxamides and their acid adducts as thickeners for liquid aqueous surfactant systems
    Patent number: 6180591
    Abstract: The invention relates to the use of compounds of the formula 1 as thickeners for liquid, aqueous surfactant systems where R is an aliphatic radical having from 8 to 24 carbon atoms, R1 and R2, which are identical or different, are alkyl groups having from 1 to 4 carbon atoms or hydroxyalkyl groups having from 2 to 4 carbon atoms, and Z is a linear polyhydroxyhydrocarbon radical having at least 3 OH groups, which may also be alkoxylated, and also their acid addition products. The thickeners are used in industrial and standard household surfactant compositions.
    Type: Grant
    Filed: May 17, 1999
    Date of Patent: January 30, 2001
    Assignee: Clariant GmbH
    Inventors: Angelika Turowski-Wanke, Matthias Löffler, Hans J{umlaut over (u)}rgen Scholz, Werner Skrypzak, Bernd Papenfuhs
  • Additives for inhibiting gas hydrate formation
    Patent number: 6177497
    Abstract: The invention relates to an additive for inhibiting gas hydrate formation, containing a) from 5 to 90% by weight of 2-isobutoxyethanol, b) from 5 to 60% by weight of a copolymer which has structural units which are derived from maleic acid, maleic anhydride or derivatives of maleic acid or of maleic anhydride, and c) at least 10% by weight of water or a monohydric or polyhydric alcohol, except the 2-isobutoxyethanol, or mixtures of the stated substances, based on the total weight of the additive, the sum of the contents of compounds a) and b) being from 10 to 90% by weight, and a process for inhibiting gas hydrate formation using 2-isobutoxyethanol.
    Type: Grant
    Filed: January 29, 1999
    Date of Patent: January 23, 2001
    Assignee: Clariant GmbH
    Inventors: Peter Klug, Frank Holtrup
  • Synergistic stabilizer mixture based on polyalkyl-1-oxa-diazaspirodecane compounds
    Patent number: 6174940
    Abstract: The present invention relates to mixtures comprising the compound I in a proportion of 65-95% by weight, the compound II in a proportion of 5-35% by weight and the compound III in a proportion of 0-10% by weight wherein the substituents are as defined in the description, and to mixtures with other compounds. The mixtures are suitable for stabilizing organic material against the effect of light and heat.
    Type: Grant
    Filed: August 13, 1998
    Date of Patent: January 16, 2001
    Assignee: Clariant GmbH
    Inventors: Thomas St{umlaut over (a)}hrfeldt, Mathias Mehrer, Matthias Z{umlaut over (a)}h, Gerhard Pfahler
  • Process for preparing N,N?-dimethylperylene-3,4,9,10-tetracarboxylic diimide in transparent pigment form
    Patent number: 6174361
    Abstract: The invention relates to a process for preparing N,N′-dimethylperylene-3,4,9,10-tetracarboxylic diimide, utilizing the reaction of perylene-3,4,9,10-tetracarboxylic dianhydride with monomethylamine, which comprises employing at least 2 times the molar amount of monomethylamine per mole of perylene-3,4,9,10-tetracarboxylic dianhydride and at least 3 times the amount by weight of water based on the weight of the dianhydride, conducting the reaction at a temperature from 50 to 200° C., removing unreacted monomethylamine by distillation, subjecting the resulting crude pigment to wet grinding in a liquid, aqueous or aqueous-organic medium in a stirred ballmill which is operated with a power density of more than 1.5 kW per liter of milling space and a stirrer tip speed of more than 12 m/s under the action of grinding media having a diameter of less than or equal to 0.
    Type: Grant
    Filed: August 13, 1999
    Date of Patent: January 16, 2001
    Assignee: Clariant GmbH
    Inventors: Manfred Urban, Martin Boehmer, Joachim Weber
  • Light stabilizers based on sterically hindered amines
    Patent number: 6172232
    Abstract: The present invention relates to novel compounds of the formula (I) in which the substituents have the meaning defined in the description. These novel compounds are excellent stabilizers for organic material against the damaging effects of light, heat and oxygen.
    Type: Grant
    Filed: September 3, 1998
    Date of Patent: January 9, 2001
    Assignee: Clariant GmbH
    Inventor: Thomas St{umlaut over (a)}hrfeldt
  • Pigment for electrophotographic toners and developers
    Patent number: 6168895
    Abstract: Azo pigment of the formula (1) which has a specific surface area of the pigment powder of more than 45 m2/g. The azo pigment is particularly suitable as colorant in electrophotographic toners and devlopers, and in powder coatings and electret materials.
    Type: Grant
    Filed: June 17, 1997
    Date of Patent: January 2, 2001
    Assignee: Clariant GmbH
    Inventors: Hans Joachim Metz, R{umlaut over (u)}diger Baur, Hans-Tobias Macholdt
  • Solid surfactant mixtures comprising fatty acid polyhydroxyamides
    Patent number: 6165972
    Abstract: A solid surfactant mixture, comprising one or more fatty acid polyhydroxyamides of the formula IRCONR.sup.1 Z (1)in which R is C.sub.7 -C.sub.31 -alkyl or C.sub.7 -C.sub.31 -alkenyl, Z is a polyhydroxyhydrocarbon group having at least two hydroxyl groups, which may also be alkoxylated, and R.sup.1 is C.sub.1 -C.sub.8 -alkyl or a group of the formula --(CH.sub.2).sub.x NR.sup.2 R.sup.3 or R.sup.4 O(CH.sub.2).sub.n --, R.sup.2 and R.sup.3 are C.sub.1 -C.sub.4 -alkyl or C.sub.2 -C.sub.4 -hydroxyalkyl, R.sup.4 is C.sub.1 -C.sub.4 -alkyl and x is a number from 1 to 10 and n is a number from 2 to 4, one or more other nonionic surfactants and/or one or more anionic surfactants.
    Type: Grant
    Filed: September 2, 1999
    Date of Patent: December 26, 2000
    Assignee: Clariant GmbH
    Inventors: Frank Weinelt, Helmut Keck
  • Process for the preparation of amido acid phenyl esters
    Patent number: 6162933
    Abstract: A process for the preparation of amido acid phenyl esters of the formula ##STR1## by reaction of a compound of the formula ##STR2## with a compound of the formula ##STR3## in the presence of an acid halide, where A, R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, X and M are as defined in the description, is claimed. The resulting amido acid phenyl esters are used as bleach activators in detergents and cleaners.
    Type: Grant
    Filed: July 30, 1999
    Date of Patent: December 19, 2000
    Assignee: Clariant GmbH
    Inventors: Michael Seebach, Peter Naumann, Werner Janitschek
  • Electrophotographic, resin-containing, electret, or inkjet compositions containing magenta azo pigment and use thereof
    Patent number: 6159649
    Abstract: The use of an azo pigment of the formula (1) ##STR1## as a colorant in electrophotographic toners, electrophotographic developers, powders and powder coatings, and electret materials, wherein said azo pigment is prepared in the presence of 20 to 50% by weight of an auxiliary selected from the group consisting of a rosin, a salt of a rosin, an abietic acid, and a salt of an abietic acid, wherein said weight is based on the overall weight of the azo pigment including said auxiliary, and wherein the azo pigment has a specific surface area of more than 70 m.sup.2 /g and the azo pigment particles comprising the azo pigment have a length-to-width ratio of on average less than 2.8:1 and a mean particle size d.sub.50 of less than 130 nm.
    Type: Grant
    Filed: September 18, 1998
    Date of Patent: December 12, 2000
    Assignee: Clariant GmbH
    Inventors: Hans-Tobias Macholdt, Dieter Baumgart, Rudiger Baur