Subambient Temperature Dyeing Process, I.e., Less Than 20 Degrees C. Patents (Class 8/473)
  • Cationic oxidation bases, their use for the oxidation dyeing of keratin fibres, dyeing compositions and dyeing methods
    Patent number: 6783557
    Abstract: The invention concerns novel pyrazolo[1,5-a]pyrimidines comprising at least a cationic group Z, Z being selected among quaternized aliphatic chains, aliphatic chains comprising at least a quaternized cycle, and their use as oxidation base for dyeing keratin fibers, the dyeing compositions containing them, and the oxidation dyeing methods using them.
    Type: Grant
    Filed: October 22, 2001
    Date of Patent: August 31, 2004
    Assignee: L'Oreal S.A.
    Inventors: Eric Terranova, Aziz Fadli, Alain Lagrange
  • Assay method for hemicellulases using a colored substrate
    Patent number: 5496707
    Abstract: The present invention provides an assay method for hemicellulases comprising a) directly dyeing, using a reactive dye, an insoluble natural product, or a modified form of a natural fibre material; and b) adding the enzyme to the dyed product produced in step a) and, after a specific incubation period, separating the liquid component from the insoluble dyed product, e.g. by a simple filtration, and determining the amount of dyestuff liberated in the the separated solution by spectrophotometric means. A combined mixing and dispensing device for use in the method of the present invention is also provided.
    Type: Grant
    Filed: April 5, 1994
    Date of Patent: March 5, 1996
    Assignees: Ciba-Geigy Corporation, Genencor International, Inc.
    Inventors: Beat Freiermuth, Dieter Werthemann, Alfred Gaertner, Spencer Fisk
  • Process for the fluorescent whitening of hydrophobic textile material with disperse fluorescent whitening agents from super-critical carbon dioxide
    Patent number: 5269815
    Abstract: A process for the fluorescent whitening of hydrophobic textile materials, especially polyesters, wherein the textile material is treated with disperse fluorescent whitening agents in supercritical CO.sub.2.
    Type: Grant
    Filed: November 13, 1992
    Date of Patent: December 14, 1993
    Assignee: Ciba-Geigy Corporation
    Inventors: Wolfgang Schlenker, Dieter Werthemann, Claude Eckhardt
  • Process for dyeing hydrophobic textile material with disperse dyes from super-critical carbon dioxide
    Patent number: 5199956
    Abstract: Polyester textile material can be dyed from supercritical CO.sub.2 with special disperse dyes.
    Type: Grant
    Filed: August 28, 1991
    Date of Patent: April 6, 1993
    Assignee: Ciba-Geigy Corporation
    Inventors: Wolfgang Schlenker, Dieter Werthemann, Peter Liechti, Angelo D. Casa