Storage-stable/clear solutions of poly(imideamides)

Details Storage-stable/clear solutions of poly(imideamides) Storage-stable/clear solutions of poly(imideamides)

1991-07-09

1999-11-30

Cain, Edward J.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

528 51, 528 52, C08K 515

Patent

active

059944323

ABSTRACT:
Storage-stable/clear solutions of linear aromatic poly(imideamides), well adopted for forming high luminance films and varnishes, comprise (a) an anhydrous .gamma.-butyrolactone solvent phase, such .gamma.-butyrolactone solvent phase (a) having from 5% to 40% by weight of a linear aromatic poly(imideamide) (b) dissolved therein, such linear aromatic poly(imideamide) (b) comprising the copolymerizate of (i) 2,4-diisocyanatotoluene, 2,6-diisocyanatotoluene, or mixture thereof, with (ii) a tricarboxylic acid monoanhydride, e.g., trimellitic acid monoanhydride, optionally, (iii) an aromatic dicarboxylic acid, e.g., terephthalic or isophthalic acid, and (iv) a monocarboxylic acid or dicarboxylic acid monoanhydride chain limiting agent, e.g., benzoic acid or phthalic anhydride.

REFERENCES:
patent: 4950700 (1990-08-01), Balme et al.
patent: 4954577 (1990-09-01), Dunwald et al.
patent: 5118778 (1992-06-01), Lambla et al.

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