Bayer Corporation

Bayer Aktiengesellschaft

Duane B Priddy, Jr

Robert J Kumpf

Burkhard Kohler

Harald Pielartzik

Douglas A Wicks

Philip E Yeske

Sze-Ming Lee

Yun Chen

Robert-Joseph Kumpf

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.

Mixtures of cyclic oligocarbonates and their manufacture

The present invention relates to heat-curable, cyclic isocyanate addition products

Heat-curable compositions based on cyclic isocyanate addition reproducts

A process is disclosed whereby a polymeric resin (containing ester and/or carbonate bonds) is readily converted into a resin having a modified molecular structure. Accordingly, a polycyclic carbonate (a monomer or oligomer) is transesterified with the polymer resin in the melt, preferably upon extrusion, optionally in the presence of a catalyst. Significantly, the cyclic carbonates are, by the inventive process, inserted into the structure of the polymer, effecting branching of the molecular structure, a branching which manifests itself in the modified properties of the resin.

Method for modifying the backbone of polymeric resins

Heat-curable compositions based on cyclic isocyanate addition products

A process is disclosed whereby a polymeric resin (containing ester and/or carbonate bonds) is readily converted into a resin having a modified molecular structure. Accordingly, a cyclic carbonate (a monomer or oligomer) is transesterified with the polymer resin in the melt, preferably upon extrusion, optionally in the presence of a catalyst. Significantly, the cyclic carbonate which may include any of a variety of functional groups may, by the inventive process, be inserted into the structure of the polymer, effecting a modification to the structure and the properties of the resin. Among the disclosed beneficial modifications thus imparted to the resin are improved thermal stability, altered rheology and optical properties.

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Pittsburgh, PA, United States of America

Duane B Priddy, Jr