Particulate pigment compositions
AssigneeCiba-Geigy Corporation
InventorRichard M. Ferrill, Jr.
Life of this patent
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Abstract
Pigmented compositions which are readily dispersible in oleoresinous vehicle systems are described. The compositions comprise by weight from 25 to 95% pigment and 5 to 75% of certain water-insoluble, friable thermoplastic polyester resins having a hydroxyl value of at least 50 mg/KOH per gram and a Ring and Ball softening point of at least 60.degree. C. Particularly preferred polyester resins are the condensation products of an aromatic dicarboxylic acid, anhydride or ester, an aromatic monocarboxylic acid and an aliphatic polyol containing at least three hydroxymethyl groups.
Claims5
A solid particulate granular pigment composition which is readily dispersible in oleoresinous vehicle systems and consists essentially of from 25 to 95% by weight of at least one pigment;
- from 1 to 15% of a cationic surfactant or blend of surfactants;
- and from 5 to 75% of a water-insoluble, non-crystalline, friable, thermoplastic polyester resin having a hydroxyl value of 75-150 mg. KOH/gram of resin and a Ring and Ball softening point of from about 65.degree. to 100.degree. C. which polyester resin is the condensation product of phthalic anhydride, p-tert. butylbenzoic acid and trimethylol ethane.
Dependencies are inferred from the claim text.