Method for preparing a (co)polyester
AssigneeBASF SE
InventorsJerome Lohmann, Maximilian Lehenmeier, Norbert Effen, Martin Bussmann, Michael Bernhard Schick, Timo Benjamin Witt
Life of this patent
Estimating the term…
Abstract
The present invention relates to a process for producing a (co)polyester, wherein the (co)polyester at least partially consists of 1,4-butylene dicarboxylate units, in a degassing plant, wherein the crude (co)polyester is degassed in the presence of 0.1% to 5% by weight, based on the total weight of the input materials, of an entraining agent at a pressure between 5 to 300 mbar.
Claims24
A process for producing a (co)polyester, wherein a crude (co)polyester comprises 1,4-butylene dicarboxylate units, in a degassing plant, wherein the crude (co)polyester is degassed in the presence of 0.1% to 5% by weight, based on the total weight of the crude (co)polyester, of an added entraining agent at a pressure between 5 to 300 mbar.
A process for producing a polymer mixture comprising one or more crude (co)polyester at least partially constructed from 1,4-butylene dicarboxylate units in a degassing plant which simultaneously functions as a mixing unit, wherein the one or more crude (co)polyester are mixed and degassed optionally with further polymers and auxiliaries in the presence of 0.1% to 5% by weight, based on the total weight of the polymer mixture, of an added entraining agent at a pressure between 0.5 to 300 mbar.
A process for producing a (co)polyester at least partially consists of 1,4-butylene dicarboxylate units, the process comprising the step of:
- degassing a crude (co)polyester in a degassing plant in the presence of 0.1 wt. % to 5 wt. % of an added entraining agent based on the total weight of the crude (co)polyester at a pressure between 5 to 300 mbar.
Dependencies are inferred from the claim text.