Patents by Inventor Volkhard Wiese

Volkhard Wiese 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).

  • Preparations for coloring molten thermoplastic polymers
    Patent number: 4094839
    Abstract: Preparations which contain 10 to 70% by weight of a pigment or a polymer-soluble colorant and 90 to 30% by weight of a carrier mixture which is composed of 51 to 95% by weight of a metal salt of an aliphatic carboxylic acid containing at least 12 carbon atoms, said metal selected from the group consisting of calcium, barium, zinc, aluminum, and magnesium, and of 49 to 5% by weight of an elastomeric or thermoplastic polymer are useful for coloring molten thermoplastic polymers in level shades.
    Type: Grant
    Filed: October 14, 1975
    Date of Patent: June 13, 1978
    Assignee: Ciba-Geigy Corporation
    Inventors: Albert Riegler, Werner Saar, Volkhard Wiese
  • Process for the dyeing of thermoplastics
    Patent number: 4083687
    Abstract: Process for dyeing thermoplastics having no reducing action, in which process there are used Mg, Zn, Cd and Ni salts of azo dye sulphonic acids of the formula ##STR1## wherein A represents a phenyl or naphthyl group optionally substituted by halogen atoms, by alkyl or alkoxy groups containing 1 - 4 C atoms, or by trifluoromethyl groups, X represents a hydrogen atom or a carboxy group, and n represents the number 1 or 2.The resulting dyeings are characterized by excellent fastness properties, especially fastness to light and to migration.
    Type: Grant
    Filed: June 18, 1976
    Date of Patent: April 11, 1978
    Assignee: Ciba-Geigy Corporation
    Inventors: Andre Pugin, Volkhard Wiese
  • Process for the distortion-free coloration of polyolefins with organic pigments
    Patent number: 4049615
    Abstract: A process for the distortion-free dope coloration of polyolefins with organic pigments, wherein the organic pigment is coated with a melamine-formaldehyde resin which is then cured.
    Type: Grant
    Filed: February 19, 1976
    Date of Patent: September 20, 1977
    Assignee: Ciba-Geigy Corporation
    Inventors: Anton Elsener, Hans Harald Gehrt, Bernhard Medinger, Volkhard Wiese