Process for purifying an aliphatic-aromatic polyester
AssigneeBASF SE
InventorsTimo Benjamin Witt, Norbert Effen, Jerome Lohmann, Motonori Yamamoto, Andreas Kuenkel
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Abstract
The present invention relates to a continuous process for purifying an aliphatic-aromatic polyester constructed from aliphatic dicarboxylic acids, aromatic dicarboxylic acids and aliphatic diols in a degassing apparatus, wherein the crude polyester is degassed for 3 to 30 minutes at a pressure of 0.01 to 5 mbar in the presence of 1% to 7% by weight, based on the total weight of the crude polyester, of an entraining agent.
Claims13
A continuous process for purifying polybutylene adipate coterephthalate in a degassing apparatus, wherein the crude polyester is degassed with an average residence time of 3 to 30 minutes and at a pressure of 0.01 to 5 mbar in the presence of 1% to 7% by weight, based on the total weight of the crude polyester, of an entraining agent, and forming a purified polybutylene adipate coterephthalate.
Dependencies are inferred from the claim text.