US 12,441,897 B2
Polyamidoamine dispersants
Ming Choon Sze, Singapore (SG); Sunil Shinde, Singapore (SG); Haihua Tang, Singapore (SG); Kerh Li Liu, Singapore (SG); and Christoph Dürr, Monheim am Rhein (DE)
Assigned to Evonik Operations GmbH, Essen (DE)
Filed by Evonik Operations GmbH, Essen (DE)
Filed on Jul. 21, 2021, as Appl. No. 17/382,008.
Claims priority of application No. 20187363 (EP), filed on Jul. 23, 2020; and application No. 21178165 (EP), filed on Jun. 8, 2021.
Prior Publication US 2022/0025193 A1, Jan. 27, 2022
Int. Cl. C09D 7/00 (2018.01); C08F 8/32 (2006.01); C08F 220/18 (2006.01); C08F 222/06 (2006.01); C08G 63/91 (2006.01); C08G 73/02 (2006.01); C08K 5/19 (2006.01); C09D 7/65 (2018.01); C09D 17/00 (2006.01)
CPC C09D 7/65 (2018.01) [C08F 8/32 (2013.01); C08F 220/1804 (2020.02); C08F 222/06 (2013.01); C08G 63/912 (2013.01); C08G 73/028 (2013.01); C08K 5/19 (2013.01); C09D 17/002 (2013.01)] 20 Claims
 
1. A pigment dispersant obtained by reacting amine-rich moieties C with at least one polymer P, said polymer P having one or more amine reactive groups,
wherein said amine-rich moieties C have an amine density of at least 600 mg KOH/g and said amine-rich moieties C are obtainable from repetitive self-reaction of at least one type of substance B and from cross-reaction of at least one B with at least one substance A, wherein the reaction temperature should remain below 230° C.,
wherein the at least one B is an adduct of the at least one substance A and at least one linker D, and B contains 1-15 amine-reactive groups and 4-15 in total number of primary, secondary, tertiary and quaternary amines,
wherein the at least one substance A is a branched and/or linear aliphatic and/or cycloaliphatic or aromatic polyamine containing 4-15 total number of primary, secondary, tertiary and quaternary amines,
wherein the at least one linker D is an acrylate, a maleate/fumarate mono-ester or a maleate/fumarate di-ester containing 1-15 amine-reactive groups, or a mixture thereof;
wherein the amine-reactive groups in B and D are reacted with reactive amines in B and/or A, and if B has only one amine reactive group then additional D and/or mixture of B and A is reacted to a previously formed C,
and wherein such additional reaction of D and/or mixture of B and A to a formed C is repeated for 1 to 10 times.