Basf Aktiengesellschaft

Gabriele Frank

Ralf Biastoch

Matthias Kummer

Microcapsules of low-formaldehyde melamine/formaldehyde resins

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 core 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&deg; to 50&deg; C. followed by curing of the shell of the capsules at from >50&deg; to 100&deg; 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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Mannheim, Germany

Gabriele Frank