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US 10,308,730 B2Granted
Preparation of a redox initiated bimorphological latex
AssigneeRohm and Haas Company
InventorsJames C. Bohling, Arnold S. Brownell, Wei Gao
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Abstract
The present invention relates to an in situ preparation of a redox initiated bimorphological aqueous dispersion of first polymer particles with protuberating phosphorus acid cores and second polymer particles without protuberating cores. The method provides a more efficient way of making compositions for pigmented coating formulations.
Claims12
An in situ method for preparing a redox initiated bimorphological aqueous dispersion of polymer particles comprising the steps of:
- a) mixing together an aqueous dispersion of phosphorus acid-functionalized acrylic-based first seed polymer particles having a volume average particle size in the range of from 40 nm to 85 nm with an aqueous dispersion of acrylic-based second seed polymer particles comprising less than 1 weight percent structural units of a phosphorus acid monomer, based on the weight of the second seed polymer particles and having a volume average particle size in the range of from 20 nm to 80 nm;
- b) contacting monomers with the aqueous dispersions of the first and second seed polymer particles under redox initiated emulsion polymerization conditions to form a dispersion of 1) polymer particles with a protuberating phosphorus acid functionalized core;
- and 2) polymer particles without a protuberating core;
- and wherein the weight-to-weight ratio of particles with the protuberating phosphorus acid functionalized core to particles without a protuberating core is in the range of 25:75 to 75:25.
1 more element
Dependencies are inferred from the claim text.