Patents by Inventor Manfred Hahnke

Manfred Hahnke 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).

  • Patent number: 4548613
    Abstract: C.I. Disperse Yellow 54 and 64 are important yellow dyestuffs of the quinophthalone type used in coloring synthetic fibers, particularly polyamide, polyester, acrylic and acetate fibers at boiling temperature conditions. Yellow azo dyestuffs of the hydroxypyridone type, e.g., C.I. Disperse Yellow 114, 180 227 and 230 have found widespread application in the high-temperature dyeing of such synthetic fibers. It has now been found that improved tinctorial results on these synthetic fiber materials can be obtained by applying a dyeing composition derived from these yellow coloring means and comprising a mixture of 70-90 parts by weight of one or more dyestuffs of the C.I. 54 and 64 type with 5 to 30 parts by weight of an azo dyestuff of the hydroxypyridone type. These improved dyestuff compositions exhibit superior leveling, high tinctorial strength or color build-up, high dyebath exhaustion and deep shade dyeing over the individual components.
    Type: Grant
    Filed: May 18, 1984
    Date of Patent: October 22, 1985
    Assignee: American Hoechst Corporation
    Inventors: Albert Bode, Thomas V. Chambers, Manfred Hahnke, Wolfgang Kretzschmar
  • Patent number: 4445904
    Abstract: A process for the continuous dyeing of fiber material of one or more acid-modified polymers or copolymers of acrylonitrile in the gel state, said fiber material having been produced by wet spinning from a spinning solution containing one or more organic solvents, which process comprises dyeing the fiber material with a solution of a carbinol base or anhydro base of a carboxyl- or sulfo-free N-arylated triarylmethane dyestuff, a carboxyl- or sulfo-free N-arylated diarylindolylmethane dyestuff, a carboxyl- or sulfo-free N-arylated diaryloxazine dyestuff, a carboxyl- or sulfo-free N-arylated diarylxanthene dyestuff, or a carboxyl- or sulfo-free N-arylated diarylazine dyestuff in a dye bath containing water and the organic spinning solvent or solvents.
    Type: Grant
    Filed: October 14, 1982
    Date of Patent: May 1, 1984
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Manfred Hahnke, Wolfgang Teige
  • Patent number: 4344879
    Abstract: Novel azamethine compounds of the formula (1) ##STR1## in which R is alkyl of from 1 to 4 carbon atoms optionally substituted, Alk is alkyl of from 1 to 4 carbon atoms, Y is the methine radical or a nitrogen atom, R.sub.1 is hydrogen or alkyl of from 1 to 4 carbon atoms optionally substituted, alkylene is an alkylene group of from 2 to 6 carbon atoms, Z is a group of the formula (2a) or 2(b) ##STR2## in which R.sub.2 is alkyl of from 1 to 4 carbon atoms optionally substituted, R.sub.3 is alkyl of from 1 to 4 carbon atoms optionally substituted, or is phenyl unsubstituted or substituted by chlorine, alkyl of from 1 to 4 carbon atoms, alkoxy of from 1 to 4 carbon atoms, nitro, carbalkoxy of from 2 to 5 carbon atoms and/or carbamoyl, R.sub.4 is hydrogen or alkyl of from 1 to 4 carbon atoms optionally substituted, or R.sub.2 and R.sub.3 together with the nitrogen atom form a heterocyclic ring containing optionally nitrogen, oxygen or sulfur as a further hetero atom, or R.sub.2 and R.sub.3 or R.sub.2, R.sub.
    Type: Grant
    Filed: November 5, 1980
    Date of Patent: August 17, 1982
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Reinhard Mohr, Manfred Hahnke
  • Patent number: 4062877
    Abstract: A novel process had been found for preparing novel violet dyestuffs of the triphenylmethane series which is characterized by that an aluminum chloride or borotrifluoride or iron-III-chloride-complex compound of a 4,4',4"-trihalogenotriphenylmethylhalide is reacted with phenyl- or naphthylamine which are substituted in the m- or p-position in a molar ratio of 1 to 1.5 at 110.degree. to 135.degree. C and in an inert organic solvent, and the mono-phenyl or -naphthylamino- substituted halide formed is reacted with 5 - 20 mols of an ortho-substituted phenyl- or naphthylamine at 150.degree. to 190.degree. C. The dyestuffs so prepared are well suitable for printing paper and plastics and dyeing polyacrylonitrile fibers.
    Type: Grant
    Filed: October 6, 1976
    Date of Patent: December 13, 1977
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Manfred Hahnke, Theodor Papenfuhs
  • Patent number: 4061464
    Abstract: A process for the preparation of new dyestuff compositions which contain one or more basic dyestuffs in the form of dyestuff bases from the series of the triarylmethane, indoldiarylmethane, azine, oxazine, thiazine or xanthene dyestuffs or one or more basic dyestuffs of the series of the azo, anthraquinone, phthalocyanine, styryl, quinophthalone, benzoxanthene, naphthoylene-benzimidazole, naphthalimide or nitro series, carrying a primary, secondary or tertiary amino group or a guanidino or hydrazino group, as well as one or more non-ionic or slightly cationic surface-active agents and, optionally, water and/or an organic solvent miscible with water, which process comprises synthesizing the dyestuff in the surface-active agent optionally containing water and/or an organic solvent miscible with water, and then adding, if necessary, water and/or a solvent miscible with water and a further surface-active agent, this process of the invention having the advantage that an intermediate isolation, drying or grinding o
    Type: Grant
    Filed: October 7, 1975
    Date of Patent: December 6, 1977
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Manfred Hahnke, Kurt Hohmann, Theodor Papenfuhs
  • Patent number: 4046752
    Abstract: A process for the direct preparation of pure thiazolazo compounds had been found with the use of a 2-aminothiazole as diazo or azo component in a coupling process wherein the 2-aminothiazole used therein is subjected to the usual coupling reaction, if used as diazocomponent after diazotation, without intermediate isolation after its preparation in known manner. This process avoids the preparation of the 2-aminothiazoles as starting compounds in its solid form and the expensive purification of these instable compounds and yields now very pure azo products.
    Type: Grant
    Filed: July 8, 1975
    Date of Patent: September 6, 1977
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Kurt Hohmann, Reinhard Mohr, Manfred Hahnke
  • Patent number: 4041054
    Abstract: An improved process for the preparation of symmetric 4-halogeno-4',4"-diarylamino-triphenyl-methane compounds by reacting a complex compound of a 4,4',4"-trihalogeno-triphenyl-methyl-halide and aliminiumchloride, iron(III)chloride or bortrifluoride with an aromatic amine, which is substituted in m- or p-position to the amino group, at an elevated temperature had been found wherein 1 mol of the complex compound is reacted with more than 4 mol of the aromatic amine and the so obtained complex compound from 4-halogen-4',4"-diarylamino-triphenyl-methyl-halide and aluminiumchloride, iron(III)chloride or bortrifluoride is subsequently converted into the anhydro- or carbinol base of the dyestuff with the aid of an aqueous alkali metal hydroxide solution whereupon the salt of the dyestuff is precipitated by addition of an acid in excess.
    Type: Grant
    Filed: June 17, 1975
    Date of Patent: August 9, 1977
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Manfred Hahnke, Theodor Papenfuhs
  • Patent number: 4020037
    Abstract: The novel improved process of the invention for spin-dyeing of acid-modified polymers or copolymers of acrylonitrile with basic dyestuffs wherein the spinning solutions of the polymers contain the basic dyestuffs in form of their free dyestuff bases as anhydro or carbinol bases is conducted with completely transparent spinning solutions avoiding clogging and mechanical abrasion of the spinning nozzles and yields filaments and fibers which do not show matting effects but have a high tinctorial strength and good and improved fastnesses to rubbing, to light and to wet-processing.
    Type: Grant
    Filed: November 26, 1974
    Date of Patent: April 26, 1977
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Manfred Hahnke, Theodor Papenfuhs, Wolfgang Teige
  • Patent number: 3996192
    Abstract: Sparingly soluble to insoluble salts of dyestuff bases having one or more arylamino groups are useful for the spin-dyeing of acid-modified polymers containing acrylonitrile units.
    Type: Grant
    Filed: March 14, 1975
    Date of Patent: December 7, 1976
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Manfred Hahnke, Theodor Papenfuhs
  • Patent number: 3966405
    Abstract: Dyestuffs of the formula ##EQU1## IN WHICH Alk is lower alkyl and in which the phenyl nucleus may be further substituted by nonionic substituents, n is 2 to 6 and x is a number of 1 up to but excluding 2, are useful for dyeing polymers containing acidic groups. These dyestuffs yield stable compositions containing 20 to 40 % by weight of one or more of said dyestuffs, 20 to 40 % by weight of an organic solvent, 20 to 40 % by weight of a nonionic dispersant of the alkylphenolpolyglycolether or fat alcohol polyglycolether type and up to 20 % by weight of water.
    Type: Grant
    Filed: March 17, 1975
    Date of Patent: June 29, 1976
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Reinhard Mohr, Manfred Hahnke