Patents Assigned to Colorcon Incorporated
  • Patent number: 3981984
    Abstract: A pigment suspension for a film coating for tablets and the like comprising a solvent, pigment particles dispersed in the solvent, and a low molecular weight alcohol soluble polymer which acts as a protective colloid coating the pigment particles and providing for a higher concentration of pigment particles in the pigment suspension. The method of making the pigment suspension comprises the steps of pouring a solvent into a container, stirring the pigment particles into the solvent to disperse the pigment particles evenly, stirring a protective colloid into the liquid in the container and dispersing it therethrough to make the liquid less viscous and more adaptable for accepting additional pigment particles, and stirring additional pigment particles into the container liquid to obtain the desired pigment suspension.A coating suspension for tablets and the like comprising the pigment suspension dispersed in a polymer solution.
    Type: Grant
    Filed: June 30, 1972
    Date of Patent: September 21, 1976
    Assignee: Colorcon Incorporated
    Inventor: Charles A. Signorino