Network polymers useful for suspending particles
AssigneesRohm and Haas Company, Dow Global Technologies LLC
InventorsMarianne P. Creamer, Gary W. Dombrowski, Eric C. Greyson, Eric P. Wasserman
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Abstract
Polymer particles having an average diameter from 100 nm to 10 μm, where each particle comprises: (a) a core; and (b) lobes comprising at least 15 wt % polymerized residues of at least one C3-C6 carboxylic acid monomer.
Claims10
Polymer particles having an average diameter from 100 nm to 10 μm, where each particle comprises:
- (a) a core;
- and (b) lobes comprising at least 15 wt % polymerized residues of at least one C3-C6 carboxylic acid monomer.
A thickened aqueous formulation containing polymer particles having an average diameter from 100 nm to 10 μm, where each particle comprises:
- (a) a core;
- and (b) lobes comprising at least 15 wt % polymerized residues of at least one C3-C6 carboxylic acid monomer;
- wherein the aqueous formulation has a pH of at least 6.
A method for producing polymer particles having an average diameter from 100 nm to 10 μm, where each particle comprises:
- (a) a core;
- and (b) lobes comprising at least 15 wt % polymerized residues of at least one C3-C6 carboxylic acid monomer;
- said method comprising steps of:
- (i) providing a seed particle comprising at least 20 wt % polymerized residues of at least one C3-C6 carboxylic acid monomer and at least 0.1 wt % polymerized residues of at least one crosslinker;
- (ii) suspending the seed particle in an aqueous emulsion with a first monomer mixture having an average Van Krevelen parameter that is lower than that of the seed particle by at least 0.5 J0.5 cm−1.5 and polymerizing said first monomer mixture;
- and (iii) adding to the aqueous emulsion a second monomer mixture and polymerizing said second monomer mixture;
- wherein the first and second monomer mixtures comprise at least 15 wt % C3-C6 carboxylic acid monomers, based on total weight of the first and second monomer mixtures.
Dependencies are inferred from the claim text.