Process for advancing etherified aminoplast resins with a guanamine

Claim 1

A process for the preparation of an advanced etherified aminoplast resin which comprises reacting, at a pH of from 2.5 to 9 and at a temperature in the range 80° to 150° C., (a) an etherified N-methylolated urea, cyclic urea, carbamate, or melamine, having the formula I, II, or III ROCH.sub.2 N(R.sup.2)--R.sup.1 --N(R.sup.3)CH.sub.2 OR I [(ROCH.sub.2).sub.m N(H).sub.P --COO].sub.n R.sup.4 II ##STR5## where R represents a hydrogen atom or an alkyl group of 1 to 6 carbon atoms, with the proviso that at least 50% of the symbols R in the groups --CH.sub.2 OR in every compound of formula I, II, and III represent such alkyl groups, R 1 represents a carbonyl group, in which case R 2 and Rhu 3 (which may be the same or different) each represents a hydrogen atom or a group of formula ROCH 2 --, or together they represent an alkylene chain of 2 to 4 carbon atoms which may be substituted by 1 or 2 hydroxyl groups and by 1 to 4 alkyl groups each of up to 5 carbon atoms, or R 1 represents a methylene or ethylene group, in which case R 2 and R 3 each represents a group of formula --COOR 11 , n either represents 1, in which case p represents zero, m represents 2, and R 4 represents an alkyl group of 1 to 18 carbon atoms which may be substituted by 1 or 2 hydroxyl groups or by an alkoxy group of from 1 to 5 carbon atoms, or n represents 2, in which case p represents zero and m represents 2, or p and m each represents 1, and R 4 represents an alkylene group of 1 to 6 carbon atoms or an arylene group of 6 to 12 carbon atoms, R 5 to R 10 , which may be the same or different, each represents a hydrogen atom or a group of formula --CH 2 OR, with the proviso that not more than 4 of them represent hydrogen atoms, and R 11 represents an alkyl group of up to 18 carbon atoms which may be substituted by 1 or 2 hydroxyl groups or by an alkoxy group of from 1 to 5 carbon atoms, with (b) a guanamine of formula ##STR6## where R 12 represents an alkyl or aralkyl group of from 1 to 18 carbon atoms, an aryl group of 6 to 8 carbon atoms, or a group of formula ##STR7## and R 13 represents an alkylene group of from 2 to 16 carbon atoms or a phenylene group, wherein 0.05 to 1 gram equivalent of guanamine residue of component (b) is used per mole of component (a).