Method of making isosorbide polycarbonate

Details Method of making isosorbide polycarbonate Method of making isosorbide polycarbonate

2011-01-04

2011-01-04

Boykin, Terressa M (Department: 1796)

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

Synthetic resins

From carboxylic acid or derivative thereof

C524S502000, C524S599000, C525S410000, C528S196000, C528S198000, C528S272000

Reexamination Certificate

active

07863404

ABSTRACT:
A polycarbonate is provided that contains repeat units derived from isosorbide and a residue derived from an activated diaryl carbonate. The polycarbonate has1H-NMR peaks associated with the repeat units derived from isosorbide. The polycarbonate contains no more than a maximum allowable amount of sorbitol-derived color bodies. If these color bodies are present in the polycarbonate it has a1H-NMR peak associated with the color bodies. The maximum allowable amount of color bodies are present when the integrated area of the1H-NMR peak associated with the color bodies divided by the integrated areas of the1H-NMR peaks associated with the repeat units derived from isosorbide is 0.025.

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