Melt-moldable crystalline polyimide polymer

Details Melt-moldable crystalline polyimide polymer Melt-moldable crystalline polyimide polymer

1988-07-11

1990-05-08

Kight, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528125, 528126, 528128, 528170, 528172, 528173, 528352, C08G 6926

Patent

active

049239686

ABSTRACT:
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.

REFERENCES:
patent: 3998786 (1976-12-01), D'Alelio
patent: 4316844 (1982-02-01), Waitkus et al.

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