Plastic and nonmetallic article shaping or treating: processes – Encapsulating normally liquid material – Liquid encapsulation utilizing an emulsion or dispersion to...
Patent
1988-03-18
1990-10-23
Lovering, Richard D.
Plastic and nonmetallic article shaping or treating: processes
Encapsulating normally liquid material
Liquid encapsulation utilizing an emulsion or dispersion to...
42840221, 503215, B01J 1302
Patent
active
049650254
ABSTRACT:
A description is given of a process for microencapsulating hydrophobic oils with color reactants of color reaction sytems dissolved therein, a cationized melamine/formaldehyde precondensate being precipitated in ultra-fine suspension from its acid aqueous solution, accompanied by vigorous stirring and by modifying the solubility conditions, said suspension is mixed under vigorous stirring with a hydrophobic oil containing the color reactants in dissolved form, the oil-in-water dispersion obtained is adjusted acid and an aqueous solution of a water-soluble, nonionic melamine/formaldehyde precondensate is added, accompanied by stirring, for forming the microcapsule envelope. For stabilizing the oil-in-water dispersion, the pH-value of the acid, aqueous solution of a cationized melamine/formaldehyde precondensate which, in the weak acid, neutral and alkaline, aqueous use range is present in insoluble, cationizable form, is raised in the absence of water-soluble, organic polymers by the addition of Bronsted bases and accompanied by vigorous stirring to such an extent that the cationizable melamine/formaldehyde precondensate is precipitated in ultra-fine suspension as a result of the modified solubility conditions. The possible elimination of the water-soluble, organic polymers is economically advantageous.
REFERENCES:
patent: 4396670 (1983-08-01), Sinclair
patent: 4525520 (1985-06-01), Shioi et al.
patent: 4824823 (1989-04-01), Pietsch et al.
"Flow Measurement", Kirk-Othmer Concise Encyclopedia of Chemical Technology, 1985, p. 496.
Pietsch Gunter
Schrader Karl-Heinz
Lovering Richard D.
Papierfabrik August Koehler AG
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