process for the preparation of metilol uree or one metilol tiouree low molecular weight

摘要

1360897 Etherified methylol ureas or thioureas CASSELLA FARBWERKE MAINKUR AG 6 July 1972 [7 July 1971] 31720/72 Heading C2C Low - molecular - weight etherified methylol ureas or thioureas are produced in aqueous solution by reacting urea or thiourea with aqueous formaldehyde in a molar ratio of urea or thiourea to formaldehyde of 1 : 0À8 to 1 : 1À4, in the presence of 1 to 8 mol. per mol. of urea or thiourea pf a water-miscible alcohol, at below 150‹ C. and under alkaline reaction conditions until a sample of the reaction mixture no longer displays turbidity when cooled to 0‹ C. The water-miscible alcohol may be methanol, ethanol, propanol, ethylene glycol, propylene glycol, trimethylene glycol or glycerol.