| 摘要 |
<p>1. Process for preparing a crosslinking component for cationic paint binders containing hydroxyl and/or primary or secondary amino groups, characterised in that, preferably in aprotic solvents, (A1) beta-hydroxyamines of formula see diagramm : EP0193103,P10,F1 wherein R represents a hydrogen atom or an alkyl or hydroxymethyl group, R1 represents an alkyl, hydroxyalkyl or hydroxypolyoxyalkyl group or a group of formula -CH2 -CH(R4 )-CO-R3 , R2 represents a hydrogen atom, an alkyl group or a group X which remains after the reaction of a monoepoxide compound see diagramm : EP0193103,P10,F2 with a primary amino group, R3 represents an -O- alkyl group, -O- hydroxyalkylene group, -O- hydroxypolyoxyalkylene group or -NH2 and R4 is a hydrogen atom or a methyl group, or (A2) beta-hydroxyamines of formula see diagramm : EP0193103,P10,F3 or see diagramm : EP0193103,P10,F4 or see diagramm : EP0193103,P10,F5 wherein R5 in each case represents a group R2 or a group R1 together with a monoepoxide group R2 , R6 represents an alkylene or polyoxyalkylene group ; R7 represents an alkyl group or a hydroxyalkyl group, R8 represents an aliphatic and/or aromatic group of a di- or polyglycidylether, and R9 represents of a polyol with 2 to 4 hydroxyl groups, are reacted with (B) isocyanate compounds at 30 to 60 degrees C in a ratio such that for each secondary amino group of formula (I) an isocyanate group is used, with the proviso that, for beta-hydroxyamines of the group (A1), essentially di- or polysocyanate compounds are used and for beta-hydroxyamines of the group (A2) essentially monoisocyanate compounds are used and (C) the reaction product is reacted at 80 to 130 degrees C in the presence of a basic catalyst with 0.5 to 1 mol of formaldehyde for each isocyanate group used and in the presence of a quantity of formaldehyde which is equimolar to the remaining beta-hydroxyamines, with azeotropic removal of a quantity of water of reaction equivalent to the quantity of formaldehyde used.</p> |
