A polyimide-based insulating film composition comprising (a) 100 parts by weight of an organic solvent-soluble polyimidosiloxane obtained from a tetracarboxylic acid component and a diamine component comprising 45 to 90 mole percent of a diaminopolysiloxane represented by the following general formula (1):
H
2
N—R
1
—[Si(R
2
)
2
—O—]
n1
—Si(R
2
)
2
—R
1
—NH
2
(1)
0.5 to 40 mole percent of a polar group-containing aromatic diamine and 0 to 50 mole percent of an aromatic diamine with plural benzene rings, (b) 2 to 40 parts by weight of a polyvalent isocyanate and (c) an organic solvent. The composition has satisfactory storage stability and printing properties, while its cured films exhibit solvent resistance, with both heat resistance and flex resistance.
一种聚
酰亚胺基绝缘薄膜组合物,包括(a)100 重量份的有机溶剂溶性聚
酰亚胺硅氧烷,该聚
酰亚胺硅氧烷由四
羧酸组分和二胺组分制得,其中二胺聚
硅氧烷由以下通式(1)表示,占 45 至 90 摩尔%:
H
2
N-R
1
-[Si(R
2
)
2
-O-]
n1
-Si(R
2
)
2
-R
1
-NH
2
(1)
0.5 至 40 摩尔百分率的含极性基团的芳香族二胺和 0 至 50 摩尔百分率的含多个苯环的芳香族二胺, (b) 2 至 40 重量份的多价
异氰酸酯和 (c) 有机溶剂。该组合物具有令人满意的储存稳定性和印刷性能,其固化薄膜具有耐溶剂性、耐热性和耐挠曲性。