Production of high molecular weight linear polycarbonates from oligomeric cyclic carbonates

Claim 1

A PROCESS FOR THE PRODUCTION OF HIGH MOLECULAR WEIGHT LINEAR POLYCARBONATES HAVING AN EXTREMELY LOW HETEROGENEITY WHICH COMPRISES HEATING, IN THE PRESENCE OF A COMPOSITION SELECTED FROM THE GROUP CONSISTING OF WATER, PHENOLS, ALCOHOLS, AND MIXTURES THEREOF, OLIGOMERIC CYCLIC CARBONATES DERIVED FROM A BINUCLEAR, AROMATIC DIHYDROXY COMPOUND, WHEREIN THE NUCLEI ARE JOINED BY A MEMBER SELECTED FROM THE GROUP CONSISTING OF LOWER ALKYLENE, LOWER ALKYLIDENE, OXYGEN, SULFUR, SO AND SO2 IN A POSITION PARA TO THE HYDROXY GROUPS, SAID OLIGOMERIC CYCLIC CARBONATES BEING OBTAINED FROM THE REACTION OF A BINUCLEAR AROMATIC DIHYDROXY COMPOUND WITH A CARBONIC ACID DERIVATIVE SELECTED FROM THE GROUP CONSISTING OF PHOSGENE AND BIS-CHLOROCARBONIC ACID ESTERS OF SAID BINUCLEAR AROMATIC DIHYDROXY COMPOUNDS IN THE PRESENCE OF AN ACID BINDING AGENT IN A HIGHLY DILUTE SOLUTION.