Mixed esters of dicarboxylic acids for use as pigment dispersants

摘要

Novel mixed esters of dicarboxylic acids with monohydric fatty alcohols and propoxylated fatty alcohols show unexpected superior properties as pigment dispersants, especially for inorganic pigments used in foundations, make-ups, lipsticks and physical sunscreens. The compounds of the present invention show superior pigment wetting and dispersing properties, as demonstrated by their ability to form fluid, very high-solids dispersions, while exhibiting unusual emolliency and gloss formation. The novel compounds of this invention have the following structural formula: wherein R₁ is has the structural formula: wherein: R₄ is a saturated or unsaturated, substituted or unsubstituted aliphatic moiety containing from 4 to 24 carbon atoms; X is an integer from 3 to 30; R₂ is a saturated or unsaturated, substituted or unsubstituted aliphatic moiety which contains from 4 to 40 carbon atoms; and R₃ is a saturated or unsaturated, straight chain or branched chain aliphatic moiety containing from 12 to 24 carbon atoms. The preferred compounds are Octyldodecyl PPG-3 Myristyl Ether Dilinoleate and Isostearyl PPG-4 Butyloctyl Ether Dilinoleate.