Nano particle mineral pigment
OwnerPrakash B. Malla, Siva Devisettiinventors
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Abstract
Mineral pigments (such as kaolin clay) having a high surface area and particle size in the nano scale range are provided which are useful in paper coating and filling, ink jet coating formulations, paint compositions, and as a filler in rubbers, plastics and polymers. These pigments are manufactured by intensive wet milling of a mineral composition which may have undergone prior dry grinding and then optionally subjecting the wet milled mineral composition to an acid treatment.
Claims29
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A process for the manufacture of a mineral pigment by treating an unground mineral composition, wherein the process comprises the sequential steps of:
- A. obtaining a beneficiated, unground mineral composition;
- B. dry grinding the mineral composition under conditions of high intensity sufficient to aggregate the particles of the mineral composition,
- whereby the surface area of the aggregated particles is increased over the surface area of the particles of the unground mineral composition;
- C. subjecting the ground mineral composition to an acid treatment,
- whereby the surface area of the aggregated particles of the acid treated ground mineral composition is increased over the surface area of the aggregated particles of the ground mineral composition prior to acid treatment;
- and
- D. wet milling the acid treated mineral composition under conditions of high intensity to produce a mineral pigment,
- whereby the particles of the wet milled mineral pigment are substantially increased in surface area and substantially decreased in particle size as compared to the acid treated mineral composition prior to wet milling.
A process for the manufacture of a mineral pigment by treating an unground mineral composition, wherein the process comprises the sequential steps of:
- A. obtaining a beneficiated, unground mineral composition;
- B. dry grinding the mineral composition under conditions of high intensity sufficient to aggregate the particles of the ground mineral composition,
- whereby the surface area of the aggregated particles is increased over the surface area of the particles of the unground mineral composition;
- C. wet milling the aggregated particles of the dry ground mineral composition under conditions of high intensity to produce a mineral pigment,
- whereby the particles of the wet milled dry ground mineral composition are substantially increased in surface area and substantially decreased in particle size as compared to the dry ground mineral composition prior to wet milling;
- and
- D. subjecting the wet milled dry ground mineral composition to an acid treatment to produce a mineral pigment,
- whereby the surface area of the particles of the wet milled acid-treated mineral pigment is substantially increased over the surface area of the particles of the wet milled dry ground mineral composition prior to acid treatment.
A nano particle mineral pigment having an increased surface area wherein the pigment is produced by a process comprising the sequential steps of:
- A. obtaining a beneficiated, unground mineral composition;
- and
- B. wet milling the mineral composition under conditions of high intensity to produce a mineral pigment,
- whereby the particles of the wet milled mineral pigment are substantially increased in surface area and substantially decreased in particle size as compared to the unground mineral composition.
A coating and filling mineral pigment produced by a process which comprises the sequential steps of:
- A. obtaining a beneficiated, unground mineral composition;
- and
- B. wet milling the mineral composition under conditions of high intensity to produce a coating and filling mineral pigment,
- whereby the particles of the mineral pigment are substantially increased in surface area and substantially decreased in particle size as compared to the unground mineral composition.
Dependencies are inferred from the claim text.