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US 6,784,262 B2Granted
Processes for chemically-modifying the surface of emulsion polymer particles
AssigneeRohm and Haas Company
InventorRobert Mitchell Blankenship
Life of this patent
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Abstract
Processes for chemically-modifying the surface of an emulsion polymer particle are provided which include providing an aqueous emulsion polymer, a monomer at a level of at least 0.5% by weight based on the weight of the emulsion polymer and a, surface-modifying chemical capable of bonding with the monomer, under conditions where there is no substantial polymerization of the monomer, and then reducing the level of the monomer by at least 50%.
Claims8
A process for chemically-modifying the surface of a polymer particle, comprising:
- (a) providing an aqueous emulsion comprising
- (i) a multistage emulsion polymer comprising a core stage polymer and a shell stage polymer,
- wherein said core stage polymer comprises, as polymerized units, from 5% to 100% by weight, based on the weight of said core stage polymer, of hydrophilic monoethylenically unsaturated monomer, and from 0% to 95% by weight, based on the weight of said core stage polymer, of at least one nonionic monoethylenically unsaturated monomer;
- and
- wherein said shell stage polymer comprises, as polymerized units, at least 50% by weight of nonionic monoethylenically unsaturated monomer;
- (ii) a nonionic monomer at a level of at least 0.5% by weight based on the weight of said multistage emulsion polymer;
- and
- (iii) at least one surface-modifying chemical capable of chemically bonding with said nonionic monomer;
- under conditions wherein there is no substantial polymerization of said nonionic monomer;
- and
- (b) reducing the level of said nonionic monomer by at least 50%.
8 more elements
Dependencies are inferred from the claim text.