Patents Assigned to Yorkshire Chemicals Limited
  • Method for dyeing acrylonitrile polymer and copolymer fibres
    Patent number: 4266940
    Abstract: There is disclosed a process for the coloration of wet spun acrylic and modacrylic fibres in the gel form which comprises using a cationic dye, or its dye bases, which are substantially insoluble in water but soluble or partly soluble in organic solvents. There are also disclosed acrylic fibres so colored.
    Type: Grant
    Filed: March 2, 1979
    Date of Patent: May 12, 1981
    Assignee: Yorkshire Chemicals Limited
    Inventors: David Blackburn, Malcolm S. Wild