US 11,958,924 B2
Process for preparing HNBR solutions with alternative solvents
Karola Schneiders, Bergisch Gladbach (DE); Susanna Lieber, Kaiserslautern (DE); and Sarah David, Dormagen (DE)
Assigned to Arlanxeo Deutschland GmbH, Dormagen (DE)
Appl. No. 17/414,688
Filed by ARLANXEO DEUTSCHLAND GMBH, Dormagen (DE)
PCT Filed Nov. 26, 2019, PCT No. PCT/EP2019/082538
§ 371(c)(1), (2) Date Jun. 16, 2021,
PCT Pub. No. WO2020/126345, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. 18213114 (EP), filed on Dec. 17, 2018.
Prior Publication US 2022/0041780 A1, Feb. 10, 2022
Int. Cl. C08F 236/12 (2006.01); C08C 19/02 (2006.01); C08F 2/06 (2006.01); C08F 4/80 (2006.01)
CPC C08F 236/12 (2013.01) [C08C 19/02 (2013.01); C08F 2/06 (2013.01); C08F 4/80 (2013.01)] 9 Claims
 
1. A process for preparing a solution of a hydrogenated nitrile-diene copolymer, said process comprising:
(i) providing a nitrile-diene copolymer;
(ii) providing a solvent mixture comprising: a first solvent comprising one or more members selected from the group consisting of monochlorobenzene, dichloromethane, benzene, dichlorobenzene, toluene, cyclohexane, and ketone-containing solvents of the general formula R3—CO—R4 where R3 and R4 each independently represent a linear or branched or cyclic alkyl having 1 to 20 carbon atoms; and a second solvent selected from cyclopentyl methyl ether (CPME);
(iii) dissolving the nitrile-diene copolymer according to (i) in the solvent mixture according to (ii) to form a solution; and
(iv) subjecting the solution formed in (iii) to hydrogenation to produce the hydrogenated nitrile-diene copolymer;
wherein the hydrogenation is conducted in the presence of a metathesis catalyst selected from the group consisting of Grubbs I catalyst of the structure (IV), Grubbs II catalyst of the structure (V), Zhan 1B catalyst of the structure (XV), Grela catalyst of the structure (XVI), and Grubbs-Hoveyda II catalyst of the structure (VII):

OG Complex Work Unit Chemistry