Aqueous nanaoparticle dispersions
AssigneeRohm and Haas Company
InventorsDavid Richard Amick, Robert Howard Gore, Dennis Paul Lorah, James Watson Neely
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Abstract
New aqueous PNP dispersions are disclosed. A method of preparing an aqueous PNP dispersion from solvent-based PNPs having a diameter in the range of from 1 to 50 nanometers is disclosed. An associative thickener composition based on PNPs having an average of at least two phobes extending from the surface of said PNPs is also disclosed. The aqueous PNP dispersions are useful in aqueous-based industrial and consumer products, such as latex paint.
Claims10
A method of preparing an aqueous PNP dispersion, comprising the steps of:
- (a) preparing a PNP dispersion, said PNP dispersion comprising:
- (i) PNPs having a diameter in the range of from 1 to 50 nanometers, said PNPs comprising as polymerized units at least one multi-ethylenically-unsaturated monomer and at least one neutralizable ethylenically-unsaturated monomer;
- and
- (ii) at least one solvent;
- (b) neutralizing at least a portion of the polymerized units formed from the at least one neutralizable ethylenically-unsaturated monomer with at least one neutralizing agent to form an at least partially neutralized PNP dispersion;
- and
- (c) combining the at least partially neutralized PNP dispersion with an aqueous medium.
An aqueous PNP dispersion, comprising:
- (a) PNPs having a diameter in the range of from 1 to 50 nanometers, said PNPs comprising as polymerized units at least one multi-ethylenically-unsaturated monomer and at least one neutralizable ethylenically-unsaturated monomer;
- (b) at least one neutralizing agent to partially neutralize the at least one neutralizable ethylenically-unsaturated monomer;
- and
- (c) an aqueous medium.
A PNP dispersion, comprising:
- (a) PNPs having a diameter in the range of from 1 to 50 nanometers, said PNPs comprising as polymerized units at least one multi-ethylenically-unsaturated monomer and at least one neutralizable ethylenically-unsaturated monomer;
- and
- (b) at least one solvent, wherein the solvent is a good solvent for the PNPs and the solubility of the solvent in water is at least 10 weight percent.
An associative thickener composition, comprising:
- PNPs having a diameter in the range of from 1 to 50 nanometers, said PNPs comprising as polymerized units at least one multi-ethylenically-unsaturated monomer and at least one neutralizable ethylenically-unsaturated monomer, and said PNPs comprising an average of at least two phobes extending from the surface of said PNPs.
Dependencies are inferred from the claim text.