Method for encapsulating water-insoluble particles

Details Method for encapsulating water-insoluble particles Method for encapsulating water-insoluble particles

1976-11-11

1978-08-29

Smith, Ronald H.

Coating processes

Particles, flakes, or granules coated or encapsulated

Applying superposed diverse coatings or coating a coated base

427212, 428403, 106308B, 427215, B32B 900, B32B 1502

Patent

active

041104927

ABSTRACT:
An improved method for encapsulating water-insoluble particles, particularly pigments, with dense, amorphous aluminum phosphate or fluorophosphate is disclosed. The capsules are formed in situ in an aqueous dispersion of the substrate by complexing aluminum and/or magnesium ion with phosphoric or fluorophosphoric acid, preferably in the presence of either boric acid or fluoride or complex fluoro ions. The encapsulation method comprises continuously adding separate solutions of the reactants into the dispersion over a 0.5 to 5.0 hour period, at 70.degree. to 100.degree. C., whereby a complex phosphate or fluorophosphate is deposited around the particles in the form of continuous, adherent microcapsules. The chemical, thermal and light stability of the substrate is thereby improved.

REFERENCES:
patent: 3650783 (1972-03-01), Yates
patent: 3870737 (1975-03-01), Birchall
patent: 3946134 (1976-03-01), Sherman

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