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of diamines and tetra acids or diamines and diacids/diester.

However, the first polyimide of significant commercial importance--Kapton--was pioneered in the 1950s by workers at DuPont who developed a successful route for synthesis of high molecular weight polyimide involving a soluble polymer precursor. Up to today this route continues being the primary route for the production of most polyimides. Polyimides have been in mass production since 1955. The field of

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