	US 11,718,697 B2
	Multi-stage latex particles with peg in outer stage
Cristian Grigoras, Suffern, NY (US); Yong Yang, Hillsborough, NJ (US); Rogina Saad, Ottsville, PA (US); and Richard Geurtsen, Robbinsville, NJ (US)
Assigned to Columbia Insurance Company, Omaha, NE (US)
Filed by Columbia Insurance Company, Omaha, NE (US)
Filed on Aug. 8, 2022, as Appl. No. 17/818,119.
Application 17/818,119 is a continuation of application No. 16/965,800, granted, now 11,447,591, previously published as PCT/US2019/015181, filed on Jan. 25, 2019.
Claims priority of provisional application 62/625,390, filed on Feb. 2, 2018.
Prior Publication US 2022/0403085 A1, Dec. 22, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. C08L 13/02 (2006.01); C08F 265/06 (2006.01); C08F 220/28 (2006.01); C08F 220/14 (2006.01); C09D 151/00 (2006.01); C08F 283/06 (2006.01)

CPC C08F 265/06 (2013.01) [C08F 220/14 (2013.01); C08F 220/286 (2020.02); C08F 283/06 (2013.01); C08L 13/02 (2013.01); C09D 151/003 (2013.01)]

15 Claims

1. An aqueous latex composition comprising an acrylic core-shell latex, wherein acrylic monomers are present at greater than 95% of all film forming monomers and wherein a water-retaining monomer is copolymerized to the shell,

wherein the Tg of the core ranges from about 0° C. to about 12° C., the Tg of the shell ranges from about 13° C. to about 40° C.,

wherein the mean volume average particle size of the core-shell latex ranges from about 125 nm to about 200 nm, and

wherein the core-shell latex comprises at least one acrylic monomer having a solubility that ranges from about 10 g/L to about 30 g/L at 30° C., and present in the shell polymer in an amount greater than about 50 wt. % of all monomers in the shell, and

wherein the water-retaining monomer is present in the shell in an amount from about 1.43% to about 5% by weight of the core-shell latex.