Capsule manufacture

Details Capsule manufacture Capsule manufacture

1983-01-24

1984-12-25

Lovering, Richard D.

Plastic and nonmetallic article shaping or treating: processes

Encapsulating normally liquid material

Liquid encapsulation utilizing an emulsion or dispersion to...

42840221, B01J 1302

Patent

active

044903138

ABSTRACT:
A process is disclosed for performing encapsulation, en masse, by an in situ polymerization reaction to yield capsule wall material. The reaction comprises the polymerization of urea and formaldehyde, monomeric or low molecular weight polymers of dimethylol urea or methylated dimethylol urea, melamine and formaldehyde, monomeric or low molecular weight polymers of methylol melamine or methylated methylol melamine, in an aqueous vehicle and the reaction is conducted in the presence of mixtures of poly-electrolyte material, esp. poly(acrylic acid), and polystyrene sulfonic acid and/or salts thereof in certain critical proportions. The disclosed encapsulation process provides improved resistance of the emulsion of intended capsule core material to destabilization and permits the manufacture of micro-capsules with improved drop size distribution.

REFERENCES:
patent: 4001140 (1977-01-01), Foris et al.
patent: 4087376 (1978-05-01), Foris et al.
patent: 4089802 (1978-05-01), Foris et al.
patent: 4100103 (1978-07-01), Foris et al.
patent: 4353809 (1982-10-01), Hoshi et al.
patent: 4409156 (1983-10-01), Hoshi et al.

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