US 12,291,582 B2
Process for producing a crosslinked cellulose ether
Alexandra Hild, Soltau (DE); Jöerg Neubauer, Hamburg (DE); Sonja Menz, Wedemark (DE); Matthias Sprehe, Walsrode (DE); and Michael Schreck, Walsrode (DE)
Assigned to DOW GLOBAL TECHNOLOGIES LLC, Midland, MI (US)
Appl. No. 17/310,470
Filed by Dow Global Technologies LLC, Midland, MI (US)
PCT Filed Apr. 17, 2020, PCT No. PCT/US2020/028671
§ 371(c)(1), (2) Date Aug. 5, 2021,
PCT Pub. No. WO2020/223039, PCT Pub. Date Nov. 5, 2020.
Claims priority of provisional application 62/841,383, filed on May 1, 2019.
Prior Publication US 2022/0127381 A1, Apr. 28, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. C08B 11/08 (2006.01); C04B 24/38 (2006.01); C08B 15/00 (2006.01)
CPC C08B 15/005 (2013.01) [C04B 24/386 (2013.01); C08B 11/08 (2013.01)] 10 Claims
 
1. A process for producing a crosslinked cellulose ether comprising the steps of:
(i) contacting at least one cellulose material with a mixture comprising (ia) at least one crosslinking agent and (ib) at least one alkalization reagent to form an activated cellulose material; and
(ii) contacting the activated cellulose material of step (i) with at least one etherification reagent; wherein the at least one etherification reagent reacts with the activated cellulose material to form the crosslinked cellulose ether;
wherein the at least one crosslinking agent is a diglycidyl ether type crosslinking agent having the following chemical Structure (I):

OG Complex Work Unit Chemistry
wherein n is selected from 3 to 25; and wherein the crosslinked cellulose ether is a water soluble crosslinked cellulose ether.