Process for advancing etherified aminoplast resins with a guanamine
AssigneeCiba-Geigy Corporation
InventorKenneth Winterbottom
Life of this patent
Estimating the term…
Abstract
Advanced, etherified aminoplast resins containing one or more guanamine residues are prepared by heating, at a pH of from 2.5 to 9, an etherified methylolated urea, cyclic urea, carbamate or melamine such as methylated methylolated urea, ethyleneurea, or propyleneurea with a guanamine, such as benzoguanamine or acetoguanamine. The products may be heated with resins containing at least two alcoholic hydroxyl, carboxylic acid, or carboxylic acid amide groups per molecule to form hard, crosslinked materials. They are particularly useful in forming surface coatings.
Claims9
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.degree. to 150.degree. 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.sup.1 represents a carbonyl group, in which case R.sup.2 and Rhu 3 (which may be the same or different) each represents a hydrogen atom or a group of formula ROCH.sub.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.sup.1 represents a methylene or ethylene group, in which case R.sup.2 and R.sup.3 each represents a group of formula --COOR.sup.11,
- n either represents 1, in which case p represents zero, m represents 2, and R.sup.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.sup.4 represents an alkylene group of 1 to 6 carbon atoms or an arylene group of 6 to 12 carbon atoms,
- R.sup.5 to R.sup.10, which may be the same or different, each represents a hydrogen atom or a group of formula --CH.sub.2 OR, with the proviso that not more than 4 of them represent hydrogen atoms, and
- R.sup.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.sup.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.sup.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).
Dependencies are inferred from the claim text.