US 12,404,397 B2
Polymer with low molecular weight portion and high glass transition temperature portion for early block resistance
Gianna Pastena, Flanders, NJ (US); Yong Yang, Hillsborough, NJ (US); Stefanie Iannacone, Sparta, NJ (US); and Johanna L. Garcia, Lake Hopatcong, NJ (US)
Assigned to Columbia Insurance Company, Omaha, NE (US)
Filed by Columbia Insurance Company, Omaha, NE (US)
Filed on Jan. 17, 2023, as Appl. No. 18/155,292.
Application 18/155,292 is a continuation in part of application No. 16/921,059, filed on Jul. 6, 2020, granted, now 11,685,800.
Prior Publication US 2023/0159738 A1, May 25, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. C08L 33/08 (2006.01); C08F 2/00 (2006.01); C08F 2/26 (2006.01); C08F 2/38 (2006.01); C08F 220/06 (2006.01); C08F 220/14 (2006.01); C08F 220/18 (2006.01); C08F 220/34 (2006.01); C08F 220/56 (2006.01); C09D 133/08 (2006.01)
CPC C08L 33/08 (2013.01) [C08F 2/001 (2013.01); C08F 2/26 (2013.01); C08F 2/38 (2013.01); C08F 220/06 (2013.01); C08F 220/14 (2013.01); C08F 220/1808 (2020.02); C08F 220/34 (2013.01); C08F 220/56 (2013.01); C09D 133/08 (2013.01); C08L 2201/52 (2013.01); C08L 2207/53 (2013.01)] 20 Claims
 
1. A copolymer latex particle comprising at least one stage,
wherein said at least one stage is formed from a first monomer mixture of one or more film forming monomers, wherein said at least one stage is copolymerized with at least one crosslinking monomer and said first monomer mixture to form an inner portion of said at least one stage and wherein an outer portion of said at least one stage is copolymerized in the presence of a chain transfer agent (CTA) and said first monomer mixture,
wherein the at least one crosslinking monomer ranges from about 1 wt. % to about 8 wt. % of the entire polymer of the total monomers in the latex particle, wherein the CTA ranges from about 0.2 wt. % to about 1 wt. % of the entire polymer of the total monomers in the latex particle, and
wherein the inner portion and the outer portion do not overlap, wherein the outer portion makes up from about 10 wt % to about 60 wt % of said at least one stage.