Melamine formaldehyde microencapsulation in aqueous solutions co

Details Melamine formaldehyde microencapsulation in aqueous solutions co Melamine formaldehyde microencapsulation in aqueous solutions co

1990-12-20

1993-12-07

Lovering, Richard D.

Plastic and nonmetallic article shaping or treating: processes

Encapsulating normally liquid material

Liquid encapsulation utilizing an emulsion or dispersion to...

503215, B01J 1318, B41M 5165

Patent

active

052681300

ABSTRACT:
A process for making melamine-formaldehyde microcapsules in an aqueous solution containing a high concentration of a water miscible or water soluble organic solvent is provided. The aqueous solution is prepared and a water insoluble melamine-formaldehyde pre-condensate is dissolved therein by adjusting the temperature and organic solvent concentration of the aqueous solution such that the melamine-formaldehyde pre-condensate is barely soluble therein. A substance to be encapsulated, preferably an oily solution containing a dyestuff precursor, is dispersed into the aqueous solution to form an emulsion, the melamine-formaldehyde pre-condensate being insoluble in the substance to be encapsulated. The melamine-formaldehyde pre-condensate is separated from the aqueous solution onto droplets of the substance to be encapsulated and the self-condensation reaction of the phase-separated melamine-formaldehyde pre-condensate initiated to form capsule walls around the droplets, thereby producing melamine-formaldehyde microcapsules in the aqueous solution containing a high concentration of a water miscible or water soluble organic solvent.

REFERENCES:
patent: 4640714 (1987-02-01), Kagota et al.
patent: 4889877 (1989-12-01), Seitz
patent: 4940738 (1990-07-01), Seitz
patent: 4940739 (1990-07-01), Seitz
patent: 4985484 (1991-01-01), Yoshida et al.

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