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US 12,479,966 B2Granted
Method for producing thermoplastic polyurethanes
AssigneeCovestro Deutschland AG
InventorsChristian Wamprecht, Faisal Shafiq, Rainer Bellinghausen, Joerg Stein, Peter Reichert
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Abstract
The present invention relates to a process for the treatment of thermoplastic polyurethane, to the treated thermoplastic polyurethane and to the use thereof.
Claims12
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.
2 more elements
Dependencies are inferred from the claim text.