Micro-encapsulated particles, e.g. metal oxide, made by using partly etherated amino-resin precondensates in which one component has high surface activity due to co-condensation with ethoxylated fatty amine

摘要

Solid particles micro-encapsulated with aminoplastic resin, in which the resin is the condensation product of partly etherated amino-resin precondensates, at least one component of which shows a high surface activity due to co-condensation with an ethoxylated fatty amine, so that the micro-particles are evenly encapsulated even at exposed points. An Independent claim is also included for a method for the quasi-continuous production of micro-encapsulated particles as above by: (a) introducing the solid particles into a reactor in which an acid-catalysed polycondensation of at least two amino-resin precondensates is carried out in the aqueous phase; (b) post-curing the polymer in a larger receiver with facilities for continuous removal of the aqueous medium; (c) separating the micro-encapsulated particles from the mother liquor and drying the micro-capsules and (d) working up the mother liquor and recycling it to the process.