Polyimides containing fluorine

Details Polyimides containing fluorine Polyimides containing fluorine

1990-12-17

1996-01-16

Hampton-Hightower, P.

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

Synthetic resins

From carboxylic acid or derivative thereof

528 26, 528 28, 528 34, 528 38, 528125, 528128, 528170, 528171, 528172, 528173, 528174, 528176, 528183, 528185, 528188, 528220, 528229, 528350, C08G 7310, C08G 6926

Patent

active

054848792

ABSTRACT:
Polyimide polymers of the following recurring structure and the corresponding polyamic acids are disclosed: ##STR1## wherein AR.sub.1 is ##STR2## where X is O, S, SO, SO.sub.2, CO, C(CF.sub.3).sub.2, C(CH.sub.3).sub.2, Si(CH.sub.3).sub.2, or a single bond, wherein AR.sub.2 may be pyromellitic dianhydride, a substituted pyromellitic dianhydride, naphthanoic dianhydride, or ##STR3## where Y is O, S, SO, SO.sub.2, CO, C(CF.sub.3).sub.2, C(CH.sub.3).sub.2, Si(CH.sub.3).sub.2 --O--AR--O--, or a single bond, where AR is an aromatic nucleus.

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"The Synthesis of Some Trifluoromethyl Derivatives of p-Amino-benzoic Acid, Sulfanilamide and p,p'-Diphenyl Sulfone" [4,4'-thiobis [(3-trifluoromethyl)benzenamine & 4,4'-sulfonyl bis[(3-trifluoromethyl benzene amine]; Sayin et al, pp. 5125-5127, Journal of American Chemical Society vol. 73, Nov. 1951.
"Aromatic Fluorine Compounds VII Replacement of Aromatic -Cl and -NO.sub.2 Groups-F.sup.1,2 "-The Synthesis of 2,2'-bis-oxybis [(5-trifluoromethyl benzenamine] and 4,4'-oxybis[(3-trifluoromethyl)benzenamine] by Finger, et al, Journal of American Chemical Society, vol. 78, Aug., 1956, pp. 6034-6037.

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