Macrocyclic oligomers containing spiro(bis)indane moieties

USRE34431E · kind E · reissue

Assignee

• General Electric Company · US

Inventors

• Daniel J. Brunelle · Scotia, US
• Thomas Link Guggenheim · Greenwood, US
• James Anthony Cella · Clifton Park, US
• Thomas L. Evans · Clifton Park, US
• Luca P. Fontana · Evansville, US
• Gary R. Faler · Scotia, US
• James M. Fukuyama · Clifton Park, US
• Eugene Pauling Boden · Scotia, US
• Jonathan D. Rich · Rexford, US
• Thomas Gerard Shannon · Neenah, US
• Sharon J. McCormick · Schenectady, US
• Philip J. McDermott · Clifton Park, US
• Alice M. Colley · Latham, US
• Joseph Guiles · Lafayette, US

Key dates

• Filing date: May 8, 1992
• Grant date: Nov 2, 1993
• Expiry date: May 8, 2012

Classification

• Technology area (CPC —): General

Abstract

Macrocyclic oligomers, including polycarbonates, polyesters, polyamides, polyimides, polyetherketones and polyethersulfones, are conveniently prepared from various spiro(bis)indane compounds, especially the 6,6'-difunctional 3,3',3'-tetramethylspiro(bis)indanes. The macrocyclic oligomers may be conveniently converted to linear polymers.