US Patent No: 5,509,960
Number of patents in Portfolio can not be more than 2000
Composite pigmentary material
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Apr 23, 1996
Issued date -
May 12, 1993
filing date -
08/059,754
serial no -
In Force
status
Importance
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Abstract
A composite particulate pigmentary material is disclosed which comprises an association of at least two chemically distinct materials in which the particles of one material carry a positive surface charge and the particles of the second material carry a negative surface charge and particles are held in association as a result of these surface charges. Also disclosed is a method for preparing composite particulate pigmentary material comprising forming aqueous dispersions of two particulate materials under conditions in which the surface charges of the particles of the two materials are of different signs and mixing the dispersions. Typical materials useful for preparing the composite include inorganic pigments, fillers and extenders and organic polymeric microspheres. The product is useful as a pigment in, for example, paints, inks, paper and plastics.
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First Claim
Related Publications
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 4,898,892 Methods for preparing opaque coatings and applying the same | 5 | 1989 | |
| 4,898,894 Film forming binders containing low density composite opacifiers | 5 | 1989 | |
| 4,912,139 Preparation of opacifier intermediates | 8 | 1989 | |
| 5,011,862 Coating media containing low density composite opacifiers | 19 | 1989 | |
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| 4,640,716 High bulking pigment and method of making same | 12 | 1985 | |
| 4,738,726 Treatment of clays with cationic polymers to prepare high bulking pigments | 43 | 1986 | |
| 4,767,466 Bulking pigments | 16 | 1986 | |
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| 4,820,554 Coated paper and process | 17 | 1986 | |
| 4,818,294 Kaolinite aggregation using organo-silicon compounds | 12 | 1987 | |
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| 4,933,387 Synthetic alkali metal alumino-silicates, methods and uses, compositions and their methods of preparation | 15 | 1989 | |
| 5,296,284 Dyed hectorite pigments and applications | 7 | 1992 | |
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| 4,569,920 Preparation of inorganic particle slurries | 35 | 1983 | |
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| 5,152,835 Composite titania-calcined kaolin opacifying pigments and method for making and using same | 32 | 1991 | |
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| 5,116,418 Process for making structural aggregate pigments | 36 | 1989 | |
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| 5,078,793 Spray drying method for preparing kaolin as a pigment extender | 13 | 1990 | |
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| 4,643,822 Method of separation of material from material mixtures | 13 | 1985 | |
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| 4,331,706 Composite zinc oxide coating on an inert pigment core product and process | 21 | 1980 | |
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| 5,344,487 Layered composite pigments and method of making same | 39 | 1992 | |