	US 12,479,966 B2
	Method for producing thermoplastic polyurethanes
Christian Wamprecht, Neuss (DE); Faisal Shafiq, Krefeld-Fischeln (DE); Rainer Bellinghausen, Odenthal (DE); Joerg Stein, Dormagen (DE); and Peter Reichert, Dormagen (DE)
Assigned to Covestro Deutschland AG, Leverkusen (DE)
Appl. No. 17/997,279
Filed by Covestro Deutschland AG, Leverkusen (DE)
PCT Filed May 7, 2021, PCT No. PCT/EP2021/062163 § 371(c)(1), (2) Date Oct. 27, 2022, PCT Pub. No. WO2021/228715, PCT Pub. Date Nov. 18, 2021.
Claims priority of application No. 20174032 (EP), filed on May 12, 2020.
Prior Publication US 2023/0174733 A1, Jun. 8, 2023
Int. Cl. C08G 18/10 (2006.01); B29C 71/02 (2006.01); C08G 18/82 (2006.01); C08J 5/18 (2006.01); C08J 5/22 (2006.01); B29B 9/06 (2006.01); B29K 75/00 (2006.01)

CPC C08J 7/08 (2013.01) [C08G 18/10 (2013.01); C08G 18/82 (2013.01); C08J 5/18 (2013.01); C08J 5/2256 (2013.01); C08J 5/2287 (2013.01); B29B 9/065 (2013.01); B29K 2075/00 (2013.01); C08J 2375/06 (2013.01); C08J 2375/08 (2013.01)]

12 Claims

1. A process for the treatment of thermoplastic polyurethane, the treatment comprising:

I) providing a thermoplastic polyurethane (TPU-1) obtained by reacting at least one polyisocyanate with at least one polyol, and

II) subjecting the thermoplastic polyurethane (TPU-1) to a temperature in a range from 10° C. to 150° C. under a gas atmosphere, a gas of the gas atmosphere having a dew point of ≤−10° C., to obtain a treated thermoplastic polyurethane (TPU-2),

wherein step II) is performed in an apparatus, wherein the apparatus is optionally a vessel or silo,

wherein the thermoplastic polyurethane (TPU-1) is supplied to the apparatus for step II) via a hose and/or a pipeline, and

wherein the hose and/or the pipeline each comprise a gas atmosphere and the gas of the gas atmosphere has a dew point of ≤−10° C.