Patents Examined by Jyoihsna Venkat
  • Process for preparation of crystalline oxytitanium phthalocyanine showing A,B or C form
    Patent number: 5183886
    Abstract: A process for the preparation of crystalline oxytitanium phthalocyanine comprising contacting dichlorotitanium phthalocyanine, dibromotitanium phthalocyanine or a mixture of them with at least one organic solvent selected from the group consisting of aromatic nitro compounds, nitrogen-containing cyclic ethers, aromatic amines, alcohols containing not less than 4 carbon atoms, aldehydes, ketones, lactones, lactams, acid amides, nitriles, alkyl sulfoxides, substituted phenols and non-substituted phenols in association with water.
    Type: Grant
    Filed: May 22, 1992
    Date of Patent: February 2, 1993
    Assignee: Mitsubishi Kasei Corporation
    Inventor: Iwao Takagishi