Patent ID: 6320019
Filing Date: 2001-11-20
Classification: C08G,H05K

Abstract:
A method for the preparation of polyamic acid, which comprises reacting a mixture containing:at least one tetracarboxylic dianhydride;at least one aromatic diamine;at least one diamine with a siloxane structure, represented by the following general formula I: ##STR7##wherein R4 is an alkylene group containing 1-20 carbon atoms and n' is the number of a recurring unit from 1 to 20; andat least one polyamino compound represented by the following general formula II or III: ##STR8##wherein A1 is selected from the group consisting of: ##STR9##A2 is selected from the group consisting of: ##STR10##wherein R represents --O--, --CH.sub.2 --, --CO--, or --SO.sub.2 --;n1 is an integer of 0 to 4; n2 is an integer of 0 to 3; n3 is 0 or 1; x represents an acid; and q is the base number of the acid.