Patent ID: 7348373

Claim:
A polyimide based composition consisting essentially of a polyimide component and an organic solvent, the polyimide component being represented by formula I: wherein X is O, S(O) 2 , C(CF 3 ) 2 , or a mixture of two or three of O, S(O) 2 , and C(CF 3 ) 2 ; wherein Y is diamine component selected from the group consisting of m-phenylenediamine (MPD), 3,4′-diaminodiphenyl ether (3,4′-ODA), 4,4′-diamino-2,2′-bis(trifluoromethyl)biphenyl (TFMB), 3,3′-diaminodiphenyl sulfone (3,3′-DDS), bis-(4-(4-aminophenoxy)phenyl)sulfone (BAPS) or 9,9-bis(4-aminophenyl)fluorene (FDA); with the proviso that: i. if X is O, then Y is not m-phenylenediamine (MPD), bis-(4-(4-aminophenoxy)phenyl)sulfone (BAPS) and 3,4′-diaminodiphenyl ether (3,4′-ODA); ii. if X is S(O) 2 , then Y is not 3,3′-diaminodiphenyl sulfone (3,3′-DDS); iii. if X is C(CF 3 ) 2 , then Y is not m-phenylenediamine (MPD), bis-(4-(4-aminophenoxy)phenyl)sulfone (BAPS), 9,9-bis(4-aminophenyl)fluorene (FDA), and 3,3′-diaminodiphenyl sulfone (3,3′-DDS); wherein the organic solvent: i. is a liquid capable of suspending or dissolving the polyimide, ii. has a Hanson polar solubility parameter between and including any two of the following numbers 2.5, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, and 10.0; and iii. has a normal boiling point between and including any two of the following numbers 180, 190, 200, 210, 220, 230, 240 and 250° C. wherein the organic solvent is a member of a group consisting of: a. a liquid represented by formula II: and wherein R 5 is H, CH 3 , or CH 3 CH 2 ; b. a liquid represented by formula III: wherein R 6 is H, CH 3 , CH 3 CH 2 , or OCH 3 and wherein R 7 is H, CH 3 , or CH 3 CH 2 ; c. a liquid represented by formula IV: wherein R 8 is CH 3 , or CH 3 CH 2 and wherein R 9 is H, CH 3 , or CH 3 CH 2 ; d. 2-phenoxyethanol; e. tetrahydrofurfural acetate; and f. combinations thereof.