Abstract: A three-dimensionally shaped aromatic imide polymer sheet article is produced by a method comprising the steps of shaping an aromatic imide polymer sheet having a second order transition temperature of 250.degree. C. to 400.degree. C. and an ultimate elongation of 120% or more at 100.degree. C., by press-stretching at least a portion of the sheet at a temperature of 100.degree. C. or more, but not exceeding a temperature of 100.degree. C. higher than the second order transition temperature of the sheet, into a desired three-dimensional convex or concave form protruding from the sheet, heat-setting the resultant shaped sheet article in its shaped form at a temperature equal to or higher than the second order transition temperature of the sheet, and then cooling the heat-set sheet article to a desired low temperature.

Abstract: An aromatic polyimide laminate sheet having a relatively large thickness of 50 .mu.m or more comprises (1) at least one first film layer comprising a polymerization-imidization product of an acid component containing 80 to 100 molar % of at least one biphenyltetracarboxylic acid with an amine component containing 80 to 100 molar % of at least one aromatic diamine having two or more benzene rings, and having a glass transition point of 250.degree. C. to 350.degree. C.; and (2) at least one second film layer comprising an aromatic imide polymer, the first and second film layers being alternately laminated on and directly bonded to each other without using bonding material.