Patents Assigned to Karl Finke OHG
  • Process for making plastic resin-dyestuff concentrates for use in the dyeing of plastic resins
    Patent number: 4271211
    Abstract: Thermoplastic base resin-dyestuff concentrates for use in the dyeing of thermoplastic base resins are made by forming an intimate mixture of a pulverulent or granular thermoplastic base resin with a dye and a wax at a temperature of about 35.degree. to 160.degree. C., the wax being solid at room temperature and being liquefied at the mixing temperature. The thus-formed mixture is then subjected to cooling and may later be used in the manufacture of colored products.
    Type: Grant
    Filed: June 8, 1978
    Date of Patent: June 2, 1981
    Assignee: Karl Finke OHG
    Inventor: Siegfried Knepper