METHOD FOR PURIFYING CRUDE POLYMETHYLOLS

摘要

THE PRESENT INVENTION RELATES TO A PROCESS FOR PURIFYING CRUDE POLYMETHYLOL WHICH COMPRISES POLYMETHYLOL OF THE FORMULA (I) IN WHICH EACH R IS INDEPENDENTLY A FURTHER METHYLOL GROUP OR AN ALKYL GROUP HAVING 1 TO 22 CARBON ATOMS OR AN ARYL OR ARALKYL GROUP HAVING 6 TO 22 CARBON ATOMS, AND ALSO HYDROXY ACID OF THE FORMULA (IV) IN WHICH EACH R IS INDEPENDENTLY AS DEFINED ABOVE, WHICH COMPRISES PERFORMING THE PURIFICATION IN A DISTILLATION COLUMN, THE BOTTOM OF THE DISTILLATION COLUMN BEING CONNECTED TO AN EVAPORATOR WITH A SHORT RESIDENCE TIME. THE PRESENT INVENTION FURTHER RELATES TO A COMPOSITION COMPRISING POLYMETHYLOL AND 1 TO 10 000 PPM BY WEIGHT OF AN ESTER OF POLYMETHYLOL AND OF A HYDROXY ACID AND TO THE USE THEREOF.