| 摘要 |
Etherified methylol derivatives of amide compounds of carbonic acid are continuously produced by a process wherein a methylol compound, obtained by introducing continuously into an evaporator a solution of the methylol compound in water formed by reacting an amide compound of carbonic acid with formaldehyde and evaporating the water by heating for not more than 60 seconds to a temperature above the melting point of the methylol compound, is withdrawn continuously in molten state from the evaporator and added immediately to a weakly acid etherification medium containing an aliphatic alcohol having from 4 to 8 carbon atoms whereupon after completion of the etherification reaction by heating the medium for up to one hour the water present in the reaction mixture is distilled off as an azeotropic mixture with the alcohol contained in the etherification medium. "Amide compound of carbonic acid" is defined as a compound containing NH2 groups which upon complete hydrolysis yields carbonic acid and ammonia, such as urea, thiourea and melamine. Alcohols specified are butanol, isobutanol and amyl alcohol. In the preferred embodiments of the invention the evaporators are thin-film evaporators. In the Provisional Specification guanidine is also specified as an amide compound of carbonic acid which may be used. Specification 801,404 is referred to.ALSO:Etherified amino-resins are continuously produced by a process wherein a methylol compound, obtained by introducing continuously into an evaporator a solution of the methylol compound in water formed by reacting an amide compound of carbonic acid with formaldehyde and evaporating the water by heating for not more than 60 seconds to a temperature above the melting point of the methylol compound, is withdrawn continuously in molten state from the evaporator and added immediately to a weakly acid etherification medium containing an aliphatic alcohol having from 4 to 8 carbon atoms whereupon after completion of the etherification reaction by heating the medium for up to one hour the water present in the reaction mixture is distilled off as an azeotropic mixture with the alcohol contained in the etherification medium. "Amide compound of carbonic acid" is defined as a compound containing NH2 groups which upon complete hydrolysis yields carbonic acid and ammonia, such as urea, thiourea and melamine. Alcohols specified are butanol, isobutanol and amyl alcohol. In the preferred embodiments of the invention the evaporators used are thin-film evaporators. In examples it is stated that the products may be mixed with alkyd resins to give coating compositions. In the Provisional Specification guanidine is also specified as an amide compound of carbonic acid which may be used. Specification 801,404 is referred to. |
