Process for producing polycarbonate resin with high flowability
AssigneeMitsubishi Gas Chemical Company, Inc.
InventorsTakahiro Adachi, Toshiaki Takata
Life of this patent
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Abstract
A process for producing a polycarbonate resin with high flowability having a viscosity average molecular weight (Mv) of 13,000 to 20,000 according to an interfacial polymerization method which comprises the steps of forming a reaction mixture while injecting phosgene into bisphenol, after the completion of injection of phosgene, adding a tetraammonium salt to the reaction mixture, then, conducting polycondensation reaction, after a viscosity average molecular weight (Mv) of a reaction mixture containing the resultant reaction products has reached to 3,000 or above and less than 6,000, adding a molecular weight modifier to the reaction mixture, further conducting polycondensation reaction, and thereby obtaining the polycarbonate resin.
Claims9
A process for producing a polycarbonate resin with high flowability having a viscosity average molecular weight (Mv) of 13,000 to 20,000 measured by Gel Permeation Chromatography according to an interfacial polymerization method which consists essentially of the steps of:
- forming a reaction mixture while injecting phosgene in bisphenol,
- after the completion of injection of phosgene, adding a tetraamonium salt to the reaction mixture, then,
- conducting a polycondensation reaction,
- after a viscosity average molecular weight (Mv) measured by Gel Permeation Chromatography of a reaction mixture containing the resultant reaction products has reached to 3,000 or above and less than 6,000, adding a molecular weight modifier to the reaction mixture,
- further conducting the polycondensation reaction, and
- thereby obtaining the polycarbonate resin.
Dependencies are inferred from the claim text.