US 12,312,420 B2
Process for producing a crosslinked cellulose ether
Alexandra Hild, Soltau (DE); Jöerg Neubauer, Hamburg (DE); Steffen Schmidt, Bomlitz (DE); and Robert Baumann, Rueschlikon (CH)
Assigned to DOW GLOBAL TECHNOLOGIES LLC, Midland, MI (US)
Appl. No. 17/428,774
Filed by Dow Global Technologies LLC, Midland, MI (US)
PCT Filed Apr. 17, 2020, PCT No. PCT/US2020/028677
§ 371(c)(1), (2) Date Aug. 5, 2021,
PCT Pub. No. WO2020/223040, PCT Pub. Date Nov. 5, 2020.
Claims priority of provisional application 62/841,391, filed on May 1, 2019.
Prior Publication US 2022/0106411 A1, Apr. 7, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. C08B 15/00 (2006.01); C04B 24/38 (2006.01)
CPC C08B 15/005 (2013.01) [C04B 24/386 (2013.01)] 13 Claims
 
1. A process for producing a crosslinked cellulose ether comprising contacting an activated cellulose material with (i) an aqueous crosslinking agent emulsion comprising (ia) at least one crosslinking agent and (ib) water; and (ii) at least one etherification reagent; wherein the aqueous crosslinking agent emulsion and the at least one etherification reagent form a reaction mixture which 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.