Patent ID: 6224795
Filing Date: 2001-05-01
Classification: B01J,Y10T

Abstract:
A process for the preparation of microcapsules comprising:condensing a melamine-formaldehyde resin and/or the methyl ethers thereof in a water dispersion of a substantially water-insoluble material forming the core of the microcapsules, in the presence of an anionic protective colloid and urea whose amino groups are optionally linked to an ethylene or propylene group, at a pH of from 3 to 6.5 and at temperatures of from 20.degree. to 50.degree. C., thereby forming the microcapsules; andcuring the shell of the microcapsules at from >50.degree. to 100.degree. C.,wherein said urea is present in an amount of from 10 to 200 wt % prior to curing, based on the melamine-formaldehyde resin.