Continuous preparation of microcapsules with melamine-formaldehy

Plastic and nonmetallic article shaping or treating: processes – Encapsulating normally liquid material – Liquid encapsulation utilizing an emulsion or dispersion to...

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42840221, 428914, 503215, B01J 1302

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active

048986968

ABSTRACT:
Microcapsules having melamine-formaldehyde precondensate capsule walls are prepared in a continuous process in aqueous dispersion starting from an appropriate melamine-formaldehyde precondensate in the presence of a water-soluble high polymer which contains strongly acid groups by further condensing the water-soluble precondensate until the solution starts to become turbid, then dispersing the material to be encapsulated in the resulting dispersion in the presence of the water-soluble high polymer which contains strongly acid groups and subsequently condensing the wall material of the resulting microcapsules to completion.

REFERENCES:
patent: 3993831 (1976-11-01), Vassiliades
patent: 4396670 (1983-08-01), Sinclair
patent: 4406816 (1983-09-01), Sliwka
patent: 4454083 (1984-06-01), Brown et al.

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