February 4, 2013

CAS databases provide millions of journal article references from more than 10,000 major scientific journals worldwide, patent and patent family references from 63 patent authorities around the world, and other reputable web sources.

The following patent record is from the CAplusSM database.


Patent Number: US 8318955
Title: Procedure for the production of diarylcarbonates from dialkyl carbonates
Inventor(s): Guertler, Christoph; Mueller, Thomas Ernst; Ooms, Pieter; Risse, Friedhelm; Rechner, Johann; Doro, Franco; Prokofieva, Angelina
Patent Assignee(s): Bayer Materialscience Aktiengesellschaft, Germany
Source: Ger. Offen., 31pp. CODEN: GWXXBX
Language: German

A continuous production of diarylcarbonates from dialkyl carbonates and hydroxyarom. compds. comprises (a) manufacturing alkylene carbonates by reacting alkylene oxides with CO2, (b) reacting these alkylene carbonates with aliphatic alcs. to obtain dialkyl carbonates and alkylene glycol, (c) separating dialkyl carbonates, (d) separating alkylene glycols, (e) oxidative carbonylation separated alkylene glycols with CO to obtain alkylene carbonate, (f) reacting dialkyl carbonates with monophenol to obtain alkylarylcarbonate or diarylcarbonate and aliphatic alc., (g) disproportionation alkylarylcarbonates to diarylcarbonates and dialkylcarbonates and (h) optionally reacting diarylcarbonates with bisphenols to obtain polycarbonates.

Please note:  Abstracts and Titles for patent records in CAplus are routinely enhanced to better describe the claimed invention. The title of the U.S. granted patent is Process for preparing diaryl carbonates from dialkyl carbonates.

 View the full-text here.

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