Low-formaldehyde dispersion of microcapsules of...

Details Low-formaldehyde dispersion of microcapsules of... Low-formaldehyde dispersion of microcapsules of...

B - Operations, Transporting

01

J

42/15, 117/45.3

B01J 13/20 (2006.01) B01J 13/18 (2006.01) B41M 5/165 (2006.01)

Patent

CA 2278993

A process for the preparation of microcapsules by the condensation of melamine-formaldehyde resins and/or the methyl ethers thereof in water, in which the substantially water-insoluble material forming the eo=e of the capsule is dispersed, in the presence of an anionic protective colloid at pH's of from 3 to 6.5 by the formation of the microcapsules at temperatures of from 20° to 50°C followed by curing of the shell of the capsules at from >50° to 100°C, in which, prior to curing, from 10 to 200 wt% of urea, whose amino groups are optionally linked to an ethylene or propylene bridge, based on the melamine-formaldehyde resin are added, the microcapsules produced by this process and also the use thereof in a pressure-sensitive recording system.

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