Method of producing the aromatic polyimide

Details Method of producing the aromatic polyimide Method of producing the aromatic polyimide

1997-05-15

1998-10-13

Hampton-Hightower, P.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528125, 528128, 528172, 528174, 528220, 528229, 528271, 528272, 528310, 528332, 528335, 528336, 528350, 528353, C08G 7310, C08G 6926

Patent

active

058213201

ABSTRACT:
18.4 grams of 4,4'-(hexafluoroisopropyridine)diphthalic acid dianhydride and 7.5 grams of 1,4-phenylenediamine dihydrochloride are mixed in a solvent consisting of 80 ml of N-methyl-2-pyrrolidone and 20 ml of dichlorobenzene and are heated at an argon atmosphere to raise its temperature from a room temperature to 170.degree. C. slowly and to be reacted for five hours while an azeotropic dihydration of water which is generated at 170.degree. C. is conducted. After the reaction is completed, a reaction product is precipitated in methanol, the precipitate is washed with methanol and dried at 80.degree. C. FIG. 1 shows the infrared spectra of the reaction product.

REFERENCES:
patent: 5420232 (1995-05-01), Dawson et al.
D. Wilson, et al. (ed.), Polyimides, Blackie & Son, Ltd., p. 32, 1990.

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