Multistage process for producing polycarbonate from oligomer

Details Multistage process for producing polycarbonate from oligomer Multistage process for producing polycarbonate from oligomer

1989-04-28

1990-09-25

Anderson, Harold D.

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

Synthetic resins

From reactant having a halogen atom or oxygen single bonded...

526 65, 528198, 528370, C08G 6438

Patent

active

049594567

ABSTRACT:
A process for producing polycarbonate from a polycarbonate oligomer and a phenol compound, comprising introducing the oligomer, caustic alkali and the phenol compound in the first reaction zone where polymerization is carried out to produce polycarbonate having a viscosity average molecular weight of 3,000 to 15,000, and then introducing the reaction mixture containing the above polycarbonate into the second reaction zone where polymerization is carried out while controlling the alkali concentration to the range of 0.05 to 0.7N by regulating caustic alkali supplied.

REFERENCES:
patent: 3386954 (1968-06-01), Schnell et al.

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