Abstract:
Reaction of a phthalic anhydride with an aminoanthraquinone in the presence of phosphorus oxychloride and/or phosphorus trichloride with perchloroethylene as solvent affords N,N''-dianthraquinonylphthalamide pigment in high yield and in easily isolatable form. In the preparation of N,N''-di-1anthraquinonylphthalamide, presence of an ''''active oxygen''''containing compound in the reaction medium affords a reddishyellow alpha polymorph; absence of an ''''active oxygen''''containing compound affords a novel greenish-yellow beta polymorph.
Abstract:
SOFT, EASILY DISPERSIBLE IRON OXIDE PIGMENTS ARE OBTAINED BY LAKING, I.E. PRECIPITATING, FRESHLY PREPARED FERROUS/FERRIC HYDROXIDE TOGETHER WITH ALUMINUM HYDROXIDE, FILTERING, WASHING THE PRECIPITATE INORGANIC SALT-FREE, AND DRYING THE PRODUCT. WHEN INCORPORATED INTO SYNTHETIC RESIN SYSTEMS, E.G. THERMOSETTING ACRYLIC RESINS, PIGMENTED COATING COMPOSITIONS OF EXCELLENT FASTNESS CHARACTERISTICS AND TRANSPARENCY ARE OBTAINED.