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US 6,294,013 B1Granted
Polysaccharide pigment dispersions
AssigneeSun Chemical Corporation
InventorsD. Mark Ortlano, Lori Lewis, Christopher J. Vissing, Joseph P. LaBazzo, Sr.
Life of this patent
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Abstract
An aqueous pigment dispersion containing at least one FD&C and/or D&C pigment dispersed in water and a polysaccharide resin optionally in combination with a styrene-acrylic resin and ethylenediaminetetraacetic acid. The dispersion offers excellent viscosity and settling stability to pH-sensitive FD&C and D&C pigments together with good color value.
Claims21
An aqueous pigment dispersion, comprising
- (i) a pigment selected from the group consisting of FD&C pigments and D&C pigments;
- (ii) a polysaccharide resin dispersant;
- and
- (iii) water.
1 more element
A process for preparing aqueous pigment dispersion, comprising
- (i) homogenizing a pigment selected from the group consisting of FD&C pigments and D&C pigment;
- a polysaccharide resin dispersant and water to form a premix, and
- (ii) milling said premix until the mean particle size distribution of the pigment is less than one micron.
Dependencies are inferred from the claim text.