Polymer coated powders
AssigneeBaran Advanced Materials (94) Ltd.
InventorItzhak Yaniv
Life of this patent
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Abstract
A process for coating a solid with a water-insoluble or slightly water-soluble coating material consisting essentially of a high-viscosity polymer and/or wax and/or grease, or mixtures thereof, comprises dissolving the said coating material in one or more solvent materials selected from among carboxylic acids, carboxylic acid anhydrides, carboxylic acid halides and/or mixtures thereof, to form a low-viscosity "polymer solution", contacting the solid to be coated with the said "polymer solution", and thereafter chemically or physically modifying the "polymer solution" to cause the formation of a coating of increased viscosity.
Claims18
A process for coating a solid with a coating material, comprising the steps of:
- (a) selecting the coating material from the group consisting of polymers, waxes and greases;
- (b) dissolving the coating material in a solvent selected from the group consisting of carboxylic acids, carboxylic acid anhydrides and carboxylic acid halides, thereby creating a coating solution;
- with said coating solution and modifying said coating solution by a method selected from the group consisting of reacting said solvent with a base and dissolving said solvent in an aqueous medium, and thereby causing the formation of the coating on the solid.
A process for the production of a solid whose surface is coated with a coating material selected from the group consisting of polymers, waxes and greases, the process comprising the steps of:
- (a) dissolving the coating material in a solvent selected from the group consisting of carboxylic acids, carboxylic acid anhydrides and carboxylic acid halides, thereby creating a coating solution;
- (b) spreading the coating solution on the surface of the solid;
- and
- (c) precipitating the coating material onto the surface of the solid by a method selected from the group consisting of reacting said solvent with a base and dissolving said solvent in an aqueous medium.
Dependencies are inferred from the claim text.