Senniger, Powers, Leavitt & Roedel
Stable precursor of polyimide and a process for preparing the same
 This invention relates to a poly (imide amic ester) random copolymer, a precursor thereof, and a process for preparing the same. Specifically this invention relates to a novel precursor of polyimide, poly(imide amic ester) which is chemically stable and has excellent workability in either liquid or solid state, a polyimide obtained therefrom and a process for preparing the same. 
Korea Research Institute of Chemical Technology
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Seo-Bong Eun-Kyoung Mi-Seon Myung-Hun Chang-Jin
Lee Kim Ryoo Lee Lee