Aromatic polyamide-imides soluble in phenolic solvents and process for producing same

Abstract

Abstract -C(-CH3)2- WHEREIN X IS AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF LOWER ALKYL GROUPS, LOWER ALKOXY GROUPS, HALOGEN ATOMS, -COOH, /OH AND SO3H; Y IS AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF -CH2-, -O-, -S-, -SO2 - AND Z-PHENYL 1,3-PHENYLENE-Y-1,3-PHENYLENE AND (2-X-1,4-PHENYLENE)-Y-(3-X-1,4-PHENYLENE); WHEREIN R IS A DIVALENT RADICAL HAVING BENZENE UNSATURATION, THE TWO LINKAGES OF WHICH ARE ATTACHED TO DIFFERENT CARBON ATOMS OF THE BENZENE RING, AT LEAST 30 MOLE PERCENT OF R BEING AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF DIVALENT RADICALS REPRESENTED BY THE FORMULAS: -(NH-CO-(1,3-DI(O=)-ISOINDOLIN-5,2-YLENE)-R)- A NOVEL AROMATIC POLYAMIDE-IMIDE CONSISTS ESSENTIALLY OF THE RECURRING UNIT REPRESENTED BY THE FORMULA: AND Z IS A LOWER ALKYL GROUP, SAID POLYAMIDE-IMIDE HAVING AN INHERENT VISCOSITY OF AT LEAST 0.1 AS MEASURED IN M-CRESOL AT 30*C. AT A CONCENTRATION OF 0.5 G./100 ML. SAID AROMATIC POLYAMIDE-IMIDE CAN DIRECTLY BE DISSOLVED IN A PHENOLIC SOLVENT, AND THE RESULTING SOLUTION MAY BE USED AS A VARNISH FOR THE FORMATION OF A HEAT-RESISTANT FILM IN VARIOUS FIELDS, SUCH AS MAGNET WIRE.

Inventors

• 👤 Munehiko Suzuki
• 👤 Etsuo Hosokawa
• 👤 Misao Waki
• 👤 Masatada Fukushima

Bibliographic Details