Patent ID: 6261483
Filing Date: 2001-07-17
Classification: B01J,B41M,C08G,Y10T

Abstract:
A process for the preparation of microcapsules by polycondensation of a melamine/formaldehyde resin mixture in water, in which the material, which is a water-insoluble or essentially undissolved gas, solid or liquid, forming the capsule core is dispersed, in the presence of an anionic protective colloid, wherein the melamine/formaldehyde resin mixture is composed of:a) an aqueous solution of a condensate which is composed ofa1) 1 mol. of melamine,a2) from 2 to 5 mol. of formaldehyde,a3) from 0 to 0.5 mol. of a melamine derivative which can undergo an addition or condensation reaction with formaldehyde, anda4) from 1 to 5 mol. of a C.sub.1 -C.sub.3 -alkanol, andb) from 0.01 to 1 mol. of a water-soluble primary, secondary or tertiary amine or ammonia.