US 12,146,050 B2
Core-shell graft copolymers with improved surface properties
Dejin Li, Newburgh, IN (US); and Vern Lowry, Ottawa, IL (US)
Assigned to SABIC GLOBAL TECHNOLOGIES B.V., Bergen op Zoom (NL)
Filed by SABIC GLOBAL TECHNOLOGIES B.V., Bergen op Zoom (NL)
Filed on Apr. 25, 2023, as Appl. No. 18/138,987.
Application 18/138,987 is a continuation of application No. 16/652,275, granted, now 11,674,033, previously published as PCT/EP2018/081528, filed on Nov. 16, 2018.
Claims priority of application No. 17201997 (EP), filed on Nov. 16, 2017.
Prior Publication US 2023/0257575 A1, Aug. 17, 2023
Int. Cl. C08L 55/02 (2006.01); C08F 6/22 (2006.01); C25D 5/56 (2006.01)
CPC C08L 55/02 (2013.01) [C08F 6/22 (2013.01); C25D 5/56 (2013.01)] 20 Claims
 
1. A core-shell graft copolymer, produced by coagulation of an aqueous latex comprising ≥10.0 wt % and <40 wt % of particles of the copolymer and a quantity of a surfactant, wherein the coagulation involves the addition of a quantity of a lithium salt or a multivalent metal salt;
wherein the multivalent metal salt is added to the latex for coagulation in a quantity of 0.5-2.5 wt % with regard to the weight of the core-shell graft copolymer particles present in the latex; and the core-shell graft copolymer comprises elastomeric core particles and thermoplastic polymer chains, ≥5.0 wt % and ≤30 wt % of the thermoplastic polymeric chains are covalently bound onto the elastomeric core particles, and ≥30.0 wt % and ≤65.0 wt % of the thermoplastic polymeric chains are not covalently bound to the elastomeric core particles, with respect to the total weight of the core-shell graft copolymer.