Pigment dispersions
Abstract
Abstract HIGHLY CONCENTRATED, STALBE BASE PIGMENT DISPERSIONS IN ORGANIC SOLVENTS ARE PREPARED BY ADDING PIGMENT TO AN ORGANIC SOLVENT IN THE PRESENCE OF SURFACTANT. THE RATE OF PIGMENT ADDITION IS ADJUSTED SO THAT PROPER WETTING OUT OF THE PIGMENT IN THE SOLVENT OCCURS. PIGMENT ADDITION IS CONTINUED UNTIL A HIGH SHEAR MASS IS OBTAINED. THIS MASS IS THEN SUBJECTED TO AGITATION FOR A SUFFICIENT PERIOD OF TIME TO BREAK DOWN PIGMENT AGGLOMERATES AND TO DISPERSE THE PIGMENT THROUGHOUT THE ORGANIC SOLVENT. IN ORDER TO OBTAIN A BASE PIGMENT DISPERSION COMPSITION THAT CAN BE READILY MIXED WITH ADDITIONAL SOLVENT AND BINDER MATERIAL, THE VISCOSITY OF THE HIGH SHEAR MASS MAY BE REDUCED BY MIXING ADDITONAL ORGANIC SOLVENT THEREWITH. PIGMENT CONCENTRATIONS OF FROM ABOUT 45% TO ABOUT 90% BY WEIGHT OF THE RESULTING BASE PIGMENT DISPERSIONS ARE OBTAINED. ANY SUITABLE BINDER MATERIAL MAY BE THEREAFTER INCORPORATED IN THE BASE PIGMENT DISPERSION COMPOSITION TO PRODUCE A FINISHED PIGMENT-BINDER DISPERSION COMPOSITION OF HIGH GLOSS AND EXCELLENT DISPERSION CHARACTERISTICS.
Inventors
- 👤 Frederick E Petke
Bibliographic Details
Claims Analysis
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