Highly soluble clear polyimides

Details Highly soluble clear polyimides Highly soluble clear polyimides

1988-04-19

1990-03-27

Kight, John

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

Synthetic resins

From carboxylic acid or derivative thereof

528125, 528126, 528128, 528172, 528185, 528188, 528229, 528310, 528331, C08G 6926, C08G 802, C08G 1400

Patent

active

049121979

ABSTRACT:
Highly soluble, optically transparent to clear aromatic polyimides in the visible range are disclosed. The dianhydrides from which the polyimides are prepared are 4,4'-[2,2,2-trifluoro-1-(trifluoromethyl) ethylidene] bis(1,2-benzenedicarboxylic anhydride) which can be partially replaced with either pyromellitic dianhydride or 3,3',4,4'-benzophenone tetracarboxylic dianhydride. The diamines from which the polyimides are prepared are m- or p- phenylene diamines which are substituted ortho to the amino groups with primary or secondary alkyl groups having 1 to 6 carbon atoms preferably methyl or ethyl.

REFERENCES:
patent: 3423491 (1969-01-01), McLain et al.
patent: 3723306 (1973-03-01), Bridgeford
patent: 3957651 (1976-05-01), Kisting
patent: 3959350 (1976-05-01), Rogers
patent: 4629777 (1986-12-01), Pfeifer
Nasa Technical Memorandum 89016, "Soluble Aromatic Polyimides for Film Coating Applications" St. Clair et al., Sep. 1986, Nasa Langley Research Center.

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