Process for the production of copolycarbonates with reduced...

Details Process for the production of copolycarbonates with reduced... Process for the production of copolycarbonates with reduced...

2006-04-25

2006-04-25

Boykin, Terressa (Department: 1711)

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

C422S131000, C422S135000, C502S150000, C502S208000, C528S198000

Reexamination Certificate

active

07034099

ABSTRACT:
A method is provided for reducing the color generated during production of copolycarbonate that includes quinone-type residues. The method includes the steps of mixing the precursors of monomer residues, a carbonate source and a polymerization catalyst into a reaction mixture. The method further includes the steps of introducing an antioxidant such as a hydroxycarboxylic acid to the reaction mixture in an amount sufficient to reduce color formation and introducing the reaction mixture to a series of process units wherein the reaction mixture polymerizes. The resulting copolycarbonate has improved color as compared to a copolycarbonate formed in a process without the step of introducing an antioxidant to the melt polymerization process.

REFERENCES:
patent: 5418315 (1995-05-01), Sakashita
patent: 5606009 (1997-02-01), Sakashita
patent: 2004/0063825 (2004-04-01), Nagai et al.

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