| 摘要 |
Hardenable, etherified aminoplast resins (I) are prepd. by a two-stage process: (a) condensation of urea and dialkylaldehydes 09'CH-CHO (II) at 50-120 deg.C, in the presence of acids, alcohols and/or other solvents, if necessary under preffuer, where R, R'=the same or different 1-6C alkyl, and up to 50 mol.% of (II) may be replaced by HCHO, (b) the resulting 2-oxo-hexahydropyrimidine deriv. (III) is hydroxy-methylated and condensed with an alcohol at pH 3-6, in 2 steps or simultaneously, if necessary, with inert diluents.
|
