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:
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):
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.
本发明公开了一种生产具有至少一个
硅氧烷键的聚酰胺酸的工艺,该工艺包括进行以下反应:
(a) 具有至少一个
硅氧烷键的四
羧酸二酐,其式如下
其中 R 代表一价烃基,m 为 1 或 1 以上的整数;
(b) 二胺;及
(c) 式(II)的二
氨基酰胺化合物:
其中 Ar 代表芳香族残基,Y 代表 SO₂ 或 CO,一个
氨基和 Y-NH₂ 相互正交、
以及
(d) 芳族四
羧酸二酐;
二胺和二
氨基酰胺化合物的总量与式(I)的四
羧酸二酐和可选含有的芳香族四
羧酸二酐的总量基本相等摩尔;
以及一种生产具有至少一个
硅氧烷键和至少一个异
吲哚喹唑啉二酮环的聚
酰亚胺的工艺,该工艺包括进一步加热所得聚酰胺酸至脱
水闭环。