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EP0356815A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Method for lowering the melt viscosity of aromatic polycarbonates, aromatic and/or araliphatic polyesters

Assignee: Bayer AG
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Filing: 1989-08-17
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Granted: —
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Expires: 2009-08-17
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Abstract

Abstract Translated from German Durch die Behandlung von aromatischen Polycarbonaten, aromatischen Polyestercarbonaten, aromatischen und/oder araliphatischen Polyestern mit überkritischen Gasen oder Gasgemischen in der Schmelze unter Druck wird die Schmelzviskosität der genannten Polymere beträchtlich erniedrigt, so daß chemische Grundoperationen an den Thermoplasten möglich werden, die bei üblichen Be­dingungen nur unvollkommen verlaufen. By treating aromatic polycarbonates, aromatic polyester carbonates, aromatic and / or araliphatic polyesters with supercritical gases or gas mixtures in the melt under pressure, the melt viscosity of the polymers mentioned is considerably reduced, so that basic chemical operations on the thermoplastics are possible, which under normal conditions only run imperfectly.

Inventors

  • 👤 Hans-Joachim Dr. Traenckner
  • 👤 Karl-Dieter Dr. Löhr
  • 👤 Wolfgang Dr. Wehnert
  • 👤 Claus Dr. Wulff
  • 👤 Wolfgang Dr. Arlt
  • 👤 Hanns-Ingolf Dr. Paul

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-08 11:49
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/40; B; B01; B01D; B01D29/00; B01D29/11; B01D29/117; B01D29/60; B01D29/606; B01D29/76; B01D29/80; B01D29/84; B01D29/846; B01D29/88; B01D29/90; B01D29/906; B01D29/92; B01D37/00; B01D37/03; C08G63/00; C08G63/88

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