Patent ID: 6046303
Filing Date: 2000-04-04
Classification: C08G,G02F

Abstract:
A soluble polyimide resin having alkoxy substituents, as expressed by formula 1, prepared by a process which comprises adding a mixture of an aliphatic tetracarboxylic anhydride as expressed by formula 2 and aromatic tetracarboxylic acid to an aromatic diamine, in which said aliphatic tetracarboxylic anhydride of formula 2 is used in the amount of 50 to 99 mole % to the total amount of anhydrides: ##STR8## wherein ##STR9## is two or more tetravalent groups selected from: ##STR10## but must include the group of the following formula 2 ##STR11## is one or more groups selected from: ##STR12## but must include the aromatic diamine group of the following formula 3: ##STR13## wherein, n represents a natural number between 4 to 18.