Patents Represented by Attorney Kevin I. Mansfield

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  • Colorant blends containing a salt-forming azo pigment and a pyrrolopyrrole pigment
    Patent number: 5869625
    Abstract: The present invention relates to colorant blends comprising (a) an azo component, which is a salt of a salt-forming azo pigment of the formulaA--N.dbd.N--B,wherein A is the residue of a diazo component and B is the residue of a coupling component; and (b) a second component, which is an opaque 1,4-diketo-3,6-diaryl-pyrrolo?3,4-c!pyrrole pigment. The colorant blends are especially useful in coating compositions, such as paints.
    Type: Grant
    Filed: April 23, 1997
    Date of Patent: February 9, 1999
    Assignee: Ciba Specialty Chemical Corporation
    Inventors: Edward Ephraim Jaffe, James Martin Delaney