Method for the production of metal oxide pigment composite of controlled agglomerating properties and respective product
AssigneeProdotti Gianni S.R.L.
InventorsGiancarlo Cravotto, Jicsinszky Laszlo, Elena Foglia
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Abstract
A process for preparing a composite containing submicron sized particles of metal oxide pigment and a natural-based organic compound is disclosed. The process includes a step of grinding a metal oxide pigment and a oligomeric and/or polymeric carbohydrate together by means of a ball mill, to obtain a pigment composite containing particles having a submicron granulometry and an outer surface partially or completely covered by the oligomeric and/or polymeric carbohydrate. A pigment composite including pigment particles having a mean hydrodynamic diameter smaller than 1 μm is also disclosed.
Claims16
A process for the preparation of a composite containing submicron sized particles of a metal oxide pigment and natural-based organic compound, comprising:
- a) providing a metal oxide pigment and an oligomeric and/or polymeric carbohydrate;
- and
- b) grinding said metal oxide pigment and said oligomeric and/or polymeric carbohydrate inside a ball mill under dry milling conditions, to obtain a pigment composite comprising metal oxide particles having a submicron granulometry and an outer surface partially or completely covered by said oligomeric and/or polymeric carbohydrate;
- wherein the mass ratio between said metal oxide pigment and said oligomeric and/or polymeric carbohydrate provided during said step a) is between 1:10 and 10:1, and
- wherein a base additive is added and mixed to said metal oxide pigment before or during said step b) of grinding, said base additive being an inorganic base additive selected from the group consisting of alkali hydroxide, alkali-earth hydroxide, carbonates, hydrogen-carbonates and any combination thereof.
Dependencies are inferred from the claim text.