Use of carbonyl compounds, sulfonyl compounds and/or thioureas as stabilizers for solutions containing pyrocarbonic acid dialkyl esters and polyisocyanate preparations containing those esters

摘要

A process for producing storage-stable solutions of pyrocarbonic acid dialkyl esters in organic liquids inert to these esters comprising adding certain carbonyl compounds, sulfonyl compounds and/or thiourea to these pyrocarbonic acid dialkyl ester solutions. Also the use of these carbonyl compounds, sulfonyl compounds and/or thiourea for producing stabilized polyisocyanate preparations suitable for the production of polyurethane foams.