Preparation of polyaryl esters
Abstract
Abstract IN THE PREPARATION OF A POLYARYL ESTER BY CONDENSING AT LEAST ONE AROMATIC DICARBOXYLIC ACID CHLORIDE WITH AT LEAST ONE DIHYDRIC PHENOL IN THE PRESENCE OF METALLIC MAGNESIUM AS CATALYST TO PRODUCE HCL AND A POLYARYL ESTER, THE IMPROVEMENT WHICH COMPRISES DISSOLVING SAID ACID CHLORIDE AND PHENOL IN AN INERT ORGANIC SOLVENT AND CONTACTING SAID SOLUTION WITH THE METALLIC MAGNESIUM IN SUBDIVIDED FROM AT A TEMPERATURE BETWEEN ABOUT 170 AND 280*C. ADVANTAGEOUSLY THE PREHEATED SOLUTION IS TRICKLED THROUGH A BED OF MAGNESIUM CHIPS IN A HEATED PIPE WITH A CONTACT TIME OF LESS THAN ABOUT 10 MINUTES. THE CONVERSION IN THE PIPE EXCEEDS 80%, BASED ON HCL FORMED, AND THE PRODUCT MAY BE FURTHER CONDENSED IN KNOWN MANNER TO VISCOSITIES IN EXCESS OF 1.
Inventors
- 👤 W Wolfes
- 👤 E Behr
Bibliographic Details
Claims Analysis
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