Patent ID: 7598410

Claim:
A method for the manufacture of an organic carbonate from a mixture of polymeric polyalcohols and their carbonates and carbamates, which through reaction of urea, a substituted urea, a salt or ester of carbamic acid or one of their N-substituted derivatives with a polyalkylkeneglycol, polyesterpolyol or a polyetherpolyol of general formula I in which R stands for a straight chain or branched alkylene group having 2 to 12 carbon atoms and n is a number between 2 and 20, or having a completely or partially hydrolyzed polyvinylalcohol of general formula II in which R′ stands for an alkyl, aryl or acyl group having 1 to 12 carbon atoms, p and q are numbers between 1 and 20, or with mixtures of these compounds, without or in presence of an alkaline catalyst favoring splitting off of ammonia and separation of the ammonia or of the amine liberated thereby is obtainable from the reaction mixture by means of a stripping gas and/or steam and/or vacuum characterized in that this mixture is reacted with alcohols or phenols with formation of their carbonates and back formation of the polymeric polyalcohols of formulas I or II.