Colored polyimide molded article, and process for production thereof
Disclosed is a process for production of a colored polyimide molded article including the steps of molding a polyamic acid solution composition containing a polyamic acid solution obtained from at least a tetracarboxylic acid component and a diamine component and a coloring precursor, or a polyimide solution composition containing a polyimide solution and a coloring precursor; and then thermally treating a molded product at 250° C. or higher.
1. A process for producing a colored polyimide molded article, the process comprising:
(a) molding a polyimide composition consisting essentially of a polyimide solution and a coloring precursor to form a molded product; and
(b) thermally treating the molded product at a temperature of from 350 to 500° C. in the air for a period of from 5 to 60 minutes to color the coloring precursor and thereby obtain the colored polyimide molded article,
wherein
the coloring precursor is a polymer obtained from an acrylonitrile-comprising monomer, and
no carbon black is present in the polyimide composition.
2. The process of claim 1 , wherein the polyimide composition is a suspension liquid or a transparent uniform solution.
3. The process of claim 1 , wherein the coloring precursor is polyacrylonitrile.