Method of manufacturing polycarbonate

Details Method of manufacturing polycarbonate Method of manufacturing polycarbonate

1995-12-28

1998-02-10

Mosley, Terressa

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

524107, 524115, 524155, 524158, 524165, 524611, 524745, 524746, 528196, 528199, 528200, 528487, C08G 6440, C08G 6400

Patent

active

057170576

ABSTRACT:
A method for manufacturing polycarbonate in which an aromatic dihydroxy compound and a carbonic acid diester can be effectively subjected to melt polycondensation using a small amount of a catalyst, making it possible to manufacture polycarbonate having outstanding color matching, outstanding thermal stability, color-matching stability, etc., during molding, and outstanding water resistance is characterized in that when an aromatic dihydroxy compound and a carbonic acid diester are subjected to melt polycondensation in the presence of a catalyst, the catalyst is dissolved or dispersed as a catalyst solution, this catalyst solution is added to the melt polycondensation reaction system, and the aromatic dihydroxy compound and carbonic acid diester are subjected to melt polycondensation.

REFERENCES:
patent: 5151491 (1992-09-01), Sakashita et al.
patent: 5276129 (1994-01-01), Sakashita et al.
patent: 5306801 (1994-04-01), Sakashita et al.
patent: 5371170 (1994-12-01), Sakashita et al.

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