Thermostable polyester

US4006120A · kind A · utility

Assignee

• Dynamit Nobel GmbH · DE

Inventors

• Erich Behr
• Wolfgang Wolfes · Niederkassel, DE

Key dates

• Filing date: Jun 5, 1974
• Grant date: Feb 1, 1977
• Expiry date: Jun 5, 1994

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G63/193
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the preparation of a thermostable polyester which is insoluble in tetrachloroethane and consists of about 40 to 200 units, said polyester having units of the formula ##STR1## combined with units of the formula ##STR2## wherein Ph is ##STR3## AND BOTH R radicals are methyl on some units and both R radicals are phenyl on the balance of the units, said methyl units comprising 5-30 mole percent of the total R-containing units which comprises heating and condensing in the absence of a catalyst 4,4'-dihydroxytetraphenylmethane having a melting point of at least 295.degree. C together with 2,2-bis-(4-hydroxyphenyl)-propane and terephthalic or isophthalic acid dichloride until there is prepared said polyester which is insoluble in tetrachlorethane.