Cyclic poly(aryl ether) oligomers

US5264538A · kind A · utility

Assignee

• THE DOW CHEMICAL COMPANY · US

Inventors

• Michael J. Mullins · Lake Jackson, US
• Edmund P. Woo · Midland, US
• Kimberly E. Balon · Midland, US
• Daniel J. Murray · Midland, US
• Cheng Chen · Ji'an, TW

Key dates

• Filing date: Jun 27, 1990
• Grant date: Nov 23, 1993
• Expiry date: Jun 27, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L71/00
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Cyclic poly(aryl ether) oligomers and mixtures thereof, and methods for the preparation thereof in a highly dilute reaction medium under reaction conditions favorable for ring closure at low degrees of polymerization. These oligomers are represented by the general formula ##STR1## where each Y is divalent oxygen or divalent sulfur, each Ar is an aromatic diradical which comprises one or more C.sub.6 to C.sub.20 arylene groups and has at least one electron withdrawing group attached to an aromatic ring, and n is an integer from 1 to about 20 with the proviso that for integer values of n equal to 1 or 2 all linkages between independent aromatic rings comprise at least one atom.