Production method of polycarbonate

Details Production method of polycarbonate Production method of polycarbonate

1996-03-14

1998-07-07

Mosley, Terressa

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

2641761, 26421124, 264219, 528198, 528199, 528481, 528501, C08G 6400

Patent

active

057770646

ABSTRACT:
A method of producing a polycarbonate excellent in the hue, the thermal stability, and the electrolysis stability by supplying a polycarbonate obtained by a transesterification method to an extruder having vent(s), melting the polycarbonate, and adding an acidic compound to the molten polycarbonate followed by kneading to continuously devolatilize low molecular weight compounds remaining in the polycarbonate. Better result is obtained by adding water to the kneaded mixture of the polycarbonate and the acidic compound before devolatilizing the low molecular weight compounds.

REFERENCES:
patent: 4627949 (1986-12-01), Dhein et al.
patent: 4952672 (1990-08-01), Moore et al.
patent: 4954303 (1990-09-01), Moore et al.

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