Polyimides containing amide and perfluoroisopropylidene connecti

Details Polyimides containing amide and perfluoroisopropylidene connecti Polyimides containing amide and perfluoroisopropylidene connecti

1991-08-28

1993-09-07

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528 28, 528 41, 528310, 528353, C08G 6932, C08G 7310

Patent

active

052430235

ABSTRACT:
New, thermooxidatively stable polyimides have been prepared from the reaction of aromatic dianhydrides containing isopropylidene bridging groups with aromatic diamines containing amide connecting groups between the rings. Several of these polyimides were shown to be semi-crystalline as evidenced by wide angle xray scattering and differential scanning calorimetry. Most of the polyimides form tough, flexible films with high tensile properties. These polyimide films exhibit enhanced solubility in organic solvents.

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patent: 4981922 (1991-01-01), Sheppard et al.
patent: 5011905 (1991-04-01), Lubowitz et al.
patent: 5104967 (1992-04-01), Sheppard et al.
patent: 5175234 (1992-12-01), Lubowitz et al.

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