US 11,970,629 B2
Aqueous dispersion of multistage polymer particles and process of making the same
Yan Li, Shanghai (CN); Tao Wang, Highton (AU); Junyu Chen, Shanghai (CN); Tao Wang, Shanghai (CN); James C. Bohling, Lansdale, PA (US); Zhi Juan Gong, Shanghai (CN); and Yuehan Hu, Shanghai (CN)
Assigned to Dow Global Technologies LLC, Midland, MI (US); and Rohm and Haas Company, Collegeville, PA (US)
Appl. No. 16/973,604
Filed by Dow Global Technologies LLC, Midland, MI (US); and Rohm and Haas Company, Collegeville, PA (US)
PCT Filed Jul. 10, 2018, PCT No. PCT/CN2018/095099
§ 371(c)(1), (2) Date Dec. 9, 2020,
PCT Pub. No. WO2020/010510, PCT Pub. Date Jan. 16, 2020.
Prior Publication US 2021/0253893 A1, Aug. 19, 2021
Int. Cl. C09D 133/12 (2006.01); C08F 220/14 (2006.01); C08F 265/00 (2006.01); C08F 265/06 (2006.01)
CPC C09D 133/12 (2013.01) [C08F 220/14 (2013.01); C08F 265/00 (2013.01); C08F 265/06 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An aqueous dispersion of multistage polymer particles comprising: an oligomer, a polymer A, and optionally a polymer B; wherein the oligomer has a weight average molecular weight of from 1,000 to 50,000 g/mol and comprises by weight based on the weight of the oligomer:
from 50% to 95% structural units of an ethylenically unsaturated nonionic monomer, and
from 5% to 50% structural units of an alkoxylated (meth)acrylate having the structure of formula (I),

OG Complex Work Unit Chemistry
wherein R1 is H or CH3, R2 is H or a C1-C6 alkyl group, R3 and R4 are each independently H or CH3, m is an integer of from 4 to 50, and n is an integer of from 0 to 6;
wherein the multistage polymer particles comprise more than 1% and less than or equal to 30% of the oligomer, by weight based on the weight of the multistage polymer particles.