Extrusion process of polyimide and polyimide pellet used for the process
AssigneeMitsui Toatsu Chemicals, Inc.
InventorsMasumi Saruwatari, Syoichi Tsuji, Yasuhiro Fujii
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Abstract
Polyimide which is obtained by polymerization and consists essentially of recurring structural units of the formula (I): ##STR1## wherein X is a single bond or a hexafluoroisopropylidene group, is processed to a form of pellet, followed by heat-treating to obtain crystallinity of 5% or more, and fed to an extruder to obtain articles.
Claims4
A polyimide pellet for use in an extrusion process comprising polyimide consisting essentially of recurring structural units represented by the formula (I) ##STR6## wherein X is a single bond or a hexafluoroisopropylidene group, and wherein the polyimide pellet has a crystallinity of 5% or more by heat-treating at 250.degree. to 370.degree. C. a non-crystallized polyimide pellet.
Dependencies are inferred from the claim text.