Aqueous dispersions of polymer-enclosed particles, related coating compositions and coated substrates
AssigneePPG Industries Ohio, Inc.
InventorsJoseph M. Ferencz, W. David Polk, Dennis L. Faler
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Abstract
Disclosed are aqueous dispersions of polymer-enclosed particles, such as nanoparticles. Also disclosed are methods for making an aqueous dispersion of polymer-enclosed particles, polymerizable polymers useful in such a method, powder coating compositions formed from such an aqueous dispersion, substrates at least partially coated with such a composition, and reflective surfaces comprising a non-hiding coating layer deposited from such a composition.
Claims17
A method for making an aqueous dispersion of polymer-enclosed particles comprising subjecting an aqueous medium to pulverizing conditions,
- wherein the aqueous medium comprises a mixture comprising:
- (a) particles,
- (b) an ethylenically unsaturated monomer, and
- (c) a water-dispersible ethylenically unsaturated polymer, and
- wherein the polymer-enclosed particles are formed by polymerizing at least a portion of the ethylenically unsaturated monomer with the water-dispersible ethylenically unsaturated polymer during the pulverizing conditions.
A method for making an aqueous dispersion of polymer-enclosed nanoparticles comprising milling a mixture comprising:
- (a) particles, (b) an ethylenically unsaturated monomer, and (c) a water-dispersible ethylenically unsaturated polymer, in an aqueous medium,
- wherein the polymer-enclosed nanoparticles are formed by polymerizing the ethylenically unsaturated monomer with the water-dispersible ethylenically unsaturated polymer during the milling, and
- wherein the milling forms nanoparticles from the particles.
Dependencies are inferred from the claim text.