Patents Represented by Attorney Edward Robert McC.

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  • Liquid preparation of cationic dye mixture containing aliphatic carboxylic acid for black dyeing
    Patent number: 4536185
    Abstract: A novel liquid preparation containing a mixture of dyes according to claim 1, an aliphatic carboxylic acid, and optionally water and organic solvents. This novel preparation is storage-stable and temperature-stable and can be used in particular for dyeing polyacrylonitrile materials in black shades, the dyeings obtained having a neutral shade, negligible change of shade in artificial light and very good fastness to light.
    Type: Grant
    Filed: December 23, 1983
    Date of Patent: August 20, 1985
    Assignee: Ciba-Geigy Corporation
    Inventors: Arnulf R. Lapple, Alex Nicopoulos