Patents Assigned to Opi Cryochimie S.A.
  • Process for treating natural polyamide fibres of asymmetric structure, such as wool, with liquid ammonia
    Patent number: 4030883
    Abstract: This invention relates to a process for treating natural polyamidic fibres of asymmetric structure, particularly wool, with liquid ammonia, in which a nucleophilic substance is added to said liquid ammonia. The treatment time is thus reduced and the dye affinity is improved.An acetate, such as ammonium acetate is preferably used and excellent results are obtained on wool.
    Type: Grant
    Filed: February 4, 1975
    Date of Patent: June 21, 1977
    Assignee: Opi Cryochimie S.A.
    Inventors: Maryvonne J. Vaesken, Alain E. Bultez, Jean-Paul Dalle