Process for the production of polycarbonate

Details Process for the production of polycarbonate Process for the production of polycarbonate

1983-04-05

1984-06-05

Lee, Lester L.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

525461, 525462, 525465, 525466, 525467, 525468, 525469, 525470, 528125, 528126, 528128, 528173, 528176, 528182, 528196, 528198, 528199, 528203, 528204, 528370, 528371, C08G 6362

Patent

active

044529660

ABSTRACT:
A process for producing polycarbonate is described, comprising reacting a chloroformate group-containing polycarbonate oligomer with an aqueous alkaline solution of a compound containing at least three functional groups and, thereafter, interfacial polycondensing the above-obtained reaction product with an aqueous alkaline solution of a dihydric phenol compound. The thus-produced polycarbonate has good melt characteristics compared with conventional polycarbonates, and the dependence of melt viscosity on a rate of shear is large. Thus, the polycarbonate of the invention is suitable for extrusion molding, particularly for blow molding using an extrusion molding machine, and can provide good quality sheets or molds.

REFERENCES:
patent: 3816373 (1974-06-01), Hoogeboom
patent: 4001184 (1977-01-01), Scott
patent: 4294953 (1981-10-01), Quinn et al.

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