Process for producing polycarbonate resin molding material havin

Details Process for producing polycarbonate resin molding material havin Process for producing polycarbonate resin molding material havin

1988-07-21

1989-07-04

Anderson, Harold D.

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

Synthetic resins

Treating polymer containing material or treating a solid...

528196, 528481, 528487, 528499, C08G 6362

Patent

active

048451932

ABSTRACT:
A process for producing a low-particle polycarbonate resin molding material suitable for use as molding material for optical materials is disclosed, which comprises directly supplying a polycarbonate resin wet powder having a water content of from 0.5 to 10.0% by weight and an organic solvent content of from 0.01 to 5.0% by weight, said wet powder, when dried, having a weight average particle diameter of from 5 to 60 mesh, to a vented extruder and extruding the wet powder while venting to obtain pellets containing not more than 20 ppm of a residual halogenated hydrocarbon. The molding material has a greatly decreased solvent content while being freed from a particle content increase.

REFERENCES:
patent: 3954713 (1976-05-01), Schnoring et al.
patent: 4252968 (1981-02-01), Govoni et al.
patent: 4546172 (1985-10-01), Kohyama et al.

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