Microencapsulation process using melamine-formaldehyde and micro

Details Microencapsulation process using melamine-formaldehyde and micro Microencapsulation process using melamine-formaldehyde and micro

1990-12-11

1993-04-20

Stoll, Robert L.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

264 47, 503213, B01J 1318, B41M 5165

Patent

active

052041859

ABSTRACT:
A process for producing melamine-formaldehyde microcapsules using a reactive protective colloid is provided. The reactive protective colloid is prepared by reactively coupling a surface active polymer with a first melamine-formaldehyde pre-condensate. An aqueous solution which includes the reactive protective colloid and a second melamine-formaldehyde pre-condensate is then prepared. A substance to be encapsulated, preferably an oily solution containing a dyestuff precursor, is dispersed as droplets into the aqueous solution. The reactive protective colloid surrounds the droplets to form an emulsion. The second melamine-formaldehyde pre-condensate and the reactive protective colloid are made to self-condense to form melamine-formaldehyde microcapsule walls around the droplets of the substance to be encapsulated.

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