Process for the isolation of polyimides in a solid state

Details Process for the isolation of polyimides in a solid state Process for the isolation of polyimides in a solid state

1972-02-07

1977-04-05

Pavelko, Thomas P.

Plastic and nonmetallic article shaping or treating: processes

Formation of solid particulate material directly from molten...

By extrusion spraying or gravity fall through orifice

260 63N, 264143, 264180, 264203, B29C 2300, B29F 300

Patent

active

040162273

ABSTRACT:
A process is described for the isolation, in a solid state, of polyimides particularly those prepared by interaction of a polyisocyanate and a polycarboxylic anhydride in an organic solvent. A solution of the polyimide is passed into water preferably in the form of droplets or as extruded thin strands. The droplets or strands can be chopped, ground or otherwise comminuted after solidification. The process is particularly applicable to the isolation of solvent-soluble polyimides prepared by reaction of benzophenone tetracarboxylic dianhydride with a mixture of methylenebis(phenyl isocyanate) and toluene diisocyanate.

REFERENCES:
patent: 2087019 (1937-07-01), Clement
patent: 2558732 (1951-07-01), Cresswell
patent: 3247165 (1966-04-01), Rodia
patent: 3365525 (1968-01-01), Schueler
patent: 3705870 (1972-12-01), Darmory
patent: 3708458 (1973-01-01), Alberino

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