Powders from wax-based colloidal dispersions and their process of making
This invention relates to colloidally-protected, wax-based microstructures and dispersions thereof. More specifically, this invention relates to powders prepared from colloidally-protected, wax-based microstructure dispersions and process of making such powders. This invention also relates to a various end-use compositions comprising such powders from wax-based colloidal dispersions.
1. A powder prepared from an aqueous wax-based colloidal dispersion comprising CPWB (colloidally-protected wax-based) microstructures by a process comprising:
(A) providing at least one wax-based colloidal dispersion;
(B) subjecting said wax-based colloidal dispersion to at least one powder-making process; and
(C) optionally subjecting the resulting powder from step (B) to a size reduction process;
wherein said wax-based colloidal dispersion is optionally subjected to additional drying before, during, or after said at least one powder-making process and wherein said aqueous wax-based colloidal dispersion comprises a wax core being colloidally protected by polymer chains tethered to said wax core; and
wherein said wax core comprises a paraffin component and a non-paraffin component;
wherein said paraffin component comprises at least one linear alkane wax defined by the general formula C n H 2n+2 , where “n” ranges from 13-80;
wherein said non-paraffin component comprises at least one wax selected from the group consisting of animal-based wax, plant-based wax, mineral wax, synthetic wax, a wax containing organic acids and/or esters, anhydrides, an emulsifier containing a mixture of organic acids and/or esters, and combinations thereof;
wherein said polymer chains comprise at least one polymer selected from the group consisting of polyvinyl alcohol and copolymers, cellulose ethers, polyethylene oxide, polyethyleneimines, and copolymers, polyethylene glycol, polyacrylamides and poly (N-isopropylamides), pullulan, sodium alginate, gelatin, starches, and combinations thereof; and
wherein said polymer chains do not form a mechanical shell encasing the core, and
wherein said wax-based colloidal dispersion is stabilized by steric hindrance, electrostatic repulsion, or both.
2. The powder as recited in claim 1 , wherein said powder comprises particles in the average particle size range of from about 1 to about 1000 microns.
3. A blended powder comprising at least two powders as recited in claim 1 wherein said at least two powders are chemically similar to each other in their said wax-based colloidal dispersion composition, but differ in their particle size or method of making said powders.