Mixtures of cyclic oligocarbonates and their manufacture
 A process for the manufacture of cyclic oligocarbonate is disclosed. The process comprises a reaction of a bis-chlorocarbonic acid ester with isatinbisphenol or with a bis-chlorocarbonic ester thereof. The mixture of cyclic oligocarbonates thus prepared is useful as a precursor in the preparation of modified polycarbonate or polyester resins. 
Bayer Corporation Bayer Aktiengesellschaft
C C C C
C07D C07D C08G C08G
inventional inventional inventional inventional
Harald Duane B. Burkhard Robert-Joseph Yun
Pielartzik Priddy, Jr. Kohler Kumpf Chen