Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1989-07-20
1990-10-16
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528125, 528128, C08G 802, C08G 6926
Patent
active
049636499
ABSTRACT:
Copolyimides and their precursors are disclosed comprising units having aromatic sulfone and aromatic fluoroaliphatic groups. These copolymers are represented by the formula ##STR1## wherein Ar' and Ar" are the same or different and are ##STR2## where Z is a chemical bond, ##STR3## Ar is the tetravalent residue of a tetracarboxylic acid or acid dianhydride or di- or tetraester thereof where the ratio of x to y is from about 1:99 to about 49:51.
These copolymers have improved processing temperatures and can be readily formed into sheets. They may also be used in applications such as hot-melt adhesives or prepregging.
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Roark David N.
Wright William E.
Ethyl Corporation
Hammond Richard J.
Hampton-Hightower P.
Kight III John
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