| abstract |
PROBLEM TO BE SOLVED: To provide a multistage aqueous emulsion polymer suitable for use in a dart pick-up resistant coating, and a coating containing the polymer. SOLUTION: The multistage aqueous emulsion polymer comprises: (I) at least one nonionic copolymerized monoethylenically unsaturated monomer, from 0.5% to 7%, based on the weight of the first polymer, of the copolymerized monoethylenically unsaturated ionic monomer; And a first polymer comprising 0% to 1.0%, by weight of the first polymer, of a copolymerized multiethylenically unsaturated monomer and having a Tg of 15C to 105C; and (ii) At least one nonionic copolymerized monoethylenically unsaturated monomer, Comprising from 0% to 2% copolymerized monoethylenically unsaturated ionic monomer, and from 0.25% to 6% copolymerized polyethylenically unsaturated monomer, based on the weight of the second polymer. , Having a Tg of −55 ° C. to 30 ° C., the second polymer having a different composition than the first polymer, and based on dry polymer weight, 25% of the total weight of the first polymer and the second polymer. % To 75% of a second polymer. |