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Reduction of reaction by-products in polycarbonate resins

Image Number 4 for United States Patent #6590068.

Polycarbonate resin containing reduced levels of reaction by-products can be prepared by adding to the polycarbonate a scavenging agent having the formula: ##STR1##wherein R.sub.1 is alkoxy, phenoxy, benzyloxy or phenyl, and R.sub.2 is a substituted or unsubstituted C.sub.1 -C.sub.30 alkyl group, C.sub.6 -C.sub.30 aryl group, C.sub.7 -C.sub.30 aralkyl group or C.sub.6 -C.sub.30 aryloxy group and processing the resulting mixture at an elevated temperature and for a period of time such that the scavenging agent reacts with linear Fries products to produce capped linear Fries products, and with residual phenols (monohydric or dihydric) to produce capped phenols and ortho-substituted phenols.

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