	US 12,129,324 B2
	Production of dispersants by nitroxide-mediated solution polymerization
Jürg Weidmann, Frauenfeld (CH); Fabia Ulber, Tagelswangen (CH); and Jörg Zimmermann, Winterthur (CH)
Assigned to SIKA TECHNOLOGY AG, Baar (CH)
Filed by SIKA TECHNOLOGY AG, Baar (CH)
Filed on May 10, 2021, as Appl. No. 17/315,414.
Application 17/315,414 is a division of application No. 16/461,138, granted, now 11,028,213, previously published as PCT/EP2017/079963, filed on Nov. 21, 2017.
Claims priority of application No. 16200072 (EP), filed on Nov. 22, 2016.
Prior Publication US 2021/0261711 A1, Aug. 26, 2021
Int. Cl. C08F 292/00 (2006.01); C04B 24/26 (2006.01); C08F 290/06 (2006.01); C08F 293/00 (2006.01); C04B 103/00 (2006.01); C04B 103/40 (2006.01)

CPC C08F 290/062 (2013.01) [C04B 24/2647 (2013.01); C04B 24/2658 (2013.01); C08F 293/005 (2013.01); C04B 2103/0045 (2013.01); C04B 2103/408 (2013.01); C08F 2438/02 (2013.01)]

19 Claims

1. A method of using a copolymer as a dispersant for solid particles comprising:

mixing a dispersant with plurality of solid particles; wherein the dispersant comprises a copolymer obtained by polymerizing ionizable monomers m1 and side chain-bearing monomers m2 by nitroxide-mediated solution polymerization to give the copolymer, wherein the polymerization is conducted in the presence of an agent comprising a carboxyl-bearing phosphated alkoxy amine; and wherein the nitroxide-mediated solution polymerization is conducted at a pH in the range of 7.5-13,

wherein the copolymer comprises a copolymer having block structure in which

the side chain-bearing monomers m2 are present in at least one first block A,

the ionizable monomers m1 are present in at least one second block B,

any proportion of monomers m1 present in the first block A is less than 15 mol % based on all the monomers m2 in the first block A, and

any proportion of monomers m2 present in the second block B is less than 15 mol % based on all the monomers m1 in the second block B.