公开(公告)号：US4923968A

公开(公告)日：1990-05-08

申请号：US217302

申请日：1988-07-11

申请人： Kouichi Kunimune ,  Kazutsune Kikuta ,  Takao Kawamoto ,  Shiro Konotsune

发明人： Kouichi Kunimune ,  Kazutsune Kikuta ,  Takao Kawamoto ,  Shiro Konotsune

IPC分类号： C08G73/10

CPC分类号： C08G73/1064 ,  C08G73/1042 ,  C08G73/1071

摘要： A crystalline polyimide polymer having a practical effectiveness that extrusion or injection molding which has so far been applied to thermoplastic resins, but could not have been achieved by conventional polyimides, are possible due to its melting point in the range of 300.degree. C. to 450.degree. C., and a process for producing the polymer, are provided, which polyimide polymer contains the following imide repetition unit (I) in 30% by mol based on the polymer and containing or not containing at least one of other imide repetition units and also having an inherent viscosity of 0.1 to 5 dl/g in conc. sulfuric acid at 30.+-.0.01.degree. C.: ##STR1## wherein X is divalent CO, divalent SO.sub.2 group, S, O or a single bond.