Basf Se Corporation

Andreas Kuenkel

Motonori Yamamoto

Klaus Hahn

Rainer Blum

Gabriel Skupin

Robert Loos

Ingo Bellin

Maximilian Hofmann

Jerome Lohmann

Norbert Effen

Bangaru Sampath

Sameer Nalawade

Carsten Sinkel

Timo Benjamin Witt

Joerg Auffermann

Andreas Fuessl

Nora Schlutt

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.

Process for purifying an aliphatic-aromatic polyester

A method for recycling a paper product sized, coated, or both sized and coated with a polymer, including: pulping an aqueous wastepaper suspension including a paper product in the presence of a hydrolase, the paper product being a paper product sized and/or coated with a polyester to obtain an aqueous solution, which is a waste paper suspension including a mixture of paper fibers and the polyester, and separating the polyester from the wastepaper suspension to recycle the paper fibers of the paper product, wherein the polyester is a polyester having a melt flow rate according to EN ISO 1133 (190&#xb0; C., 2.16 kg weight) of from 2 to 50 cm/10 min, and the hydrolase includes at least one of a carboxyesterase [3.1.1.1], a lipase [3.1.1.3], and a cutinase [3.1.1.74].

Method for recycling paper products coated with polyester polymers

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Neustadt, Germany

Andreas Kuenkel