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EP0010602A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Polycarbonates with alkylphenyl end groups and their preparation

Assignee: Bayer AG
•
Filing: 1979-09-17
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Granted: —
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Expires: 1999-09-17
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Abstract

Abstract Translated from German Gegenstand der vorliegenden Erfindung sind thermoplastische aromatische Polycarbonate mit Molekulargewichten Mw (Gewichtsmittel) von mindestens 10 000, insbesondere von 10 000 bis 200 0000 und vorzugsweise von 20 000 bis 80 000 auf Basis von Diphenolen, phenolischen Kettenabbrechern der Formel I <IMAGE> und gegebenenfalls Verzweigern, die dadurch gekennzeichnet sind, daß R einen verzweigten Alkylrest aus 8 und/oder 9 C-Atomen darstellt, wobei im Alkylrest R der Anteil an CH3-Protonen zwischen 47% und 89% und der Anteil der Sum3me der CH- und CH2-Protonen zwischen 53% und 11% liegen, und worin R in o- und/oder p-Stellung zur OH-Gruppe stehen kann, wobei die obere Grenze des ortho-Anteils bei 20% liegt. The present invention relates to thermoplastic aromatic polycarbonates with molecular weights Mw (weight average) of at least 10,000, in particular from 10,000 to 200,000 and preferably from 20,000 to 80,000, based on diphenols, phenolic chain terminators of the formula I <IMAGE> and optionally branching agents , which are characterized in that R represents a branched alkyl radical of 8 and / or 9 carbon atoms, the proportion of CH3 protons in the alkyl radical R being between 47% and 89% and the proportion of the sum of the CH and CH2 protons are between 53% and 11%, and in which R can be in the o- and / or p-position to the OH group, the upper limit of the ortho portion being 20%.

Inventors

  • 👤 Dieter Dr. Freitag
  • 👤 Werner Dr. Nouvertné
  • 👤 Claus Dr. Burkhardt
  • 👤 Frank Dr. Kleiner

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-02 21:25
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/04; C08G64/06; C08G64/14

Claims Analysis

Total Claims: 0
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References Cited (Backward Citations)

US3177179A Cited
US3544514A Cited
DE2063050A1 Cited

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