A method for the production of polyamide acid with siloxane bonds and of polyimide having siloxane bonds and isoindolochinazolindion - rings.

摘要

There are disclosed a process for producing a polyamide acid having at least one siloxane bond, which comprises carrying out the reaction of: (a) a tetracarboxylic dianhydride having at least one siloxane bond of the formula: CHEM wherein R represents a monovalent hydrocarbon group and m is an integer of 1 or more; (b) a diamine; and (c) a diaminoamide compound of the formula (II): CHEM wherein Ar represents an aromatic residue, Y represents SO2 or CO, and one amino group and Y-NH2 are positioned in ortho-position to each other, and optinal presence of (d) an aromatic tetracarboxylic dianhydride; with the total amount of the diamine and the diaminoamide compound and the total amount of the tetracarboxylic dianhydride of the formula (I) and the aromatic tetracarboxylic dianhydride optionally contained being substantially equal moles; and a process for producing a polyimide having at least one siloxane bond and at least one isoindoloquinazolinedione ring, which comprises further heating the resulting polyamide acid to dehydration ring closure.