Method for heat treating shaped articles of amide-imide or amic acid polymers
 Process for heat treating a shaped article of polyamide-imide or polyamic acid comprising preheating the article to remove a major portion of volatiles contained in the article and generated therein and to increase the polymer's deflection temperature by about 15 to about 35.degree. F. without deformation of the article, and heating the article at about 5.degree. to about 25.degree. F. below the increased deflection temperature to progressively increase the polymer's deflection temperature to substantially its maximum attainable value without deformation, said preheating and heating being carried out in the presence of a circulating gas. 
Standard Oil Company (Indiana)
C Y C
C08G Y10S C08G
inventional additional inventional
Yu-Tsai
Chen