Method for extruder devolatilization of spiro(bis)indane polycar

Details Method for extruder devolatilization of spiro(bis)indane polycar Method for extruder devolatilization of spiro(bis)indane polycar

1989-08-28

1990-12-25

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Vacuum treatment of work

264106, 26421124, 26433111, 425203, 528201, 528370, B29C 4776

Patent

active

049801058

ABSTRACT:
Spiro(bis)indane polycarbonates, including homo- and copolycarbonates, are devolatilized by extrusion under conditions of low viscous dissipation and low residence time. By this method, volatile impurities including spiro(bis)indane cyclic dimer may be removed.

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patent: 4514357 (1985-04-01), Kawaguchi et al.
patent: 4627949 (1986-12-01), Dhein et al.
patent: 4764331 (1988-08-01), Tokuhara et al.

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