Capsule manufacture

Details Capsule manufacture Capsule manufacture

1986-03-31

1987-06-23

Lovering, Richard D.

Stock material or miscellaneous articles

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

Particulate matter

264 47, 428914, 503215, B01J 1302

Patent

active

046752498

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, or 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 melamine, in an aqueous vehicle and the reaction is conducted in the presence of certain acrylic acid copolymers. The disclosed encapsulation process provides improved resistance of the emulsion of intended capsule core material to destabilization and permits the manufacture of microcapsules with improved drop size distribution, improved resistance to frictional smudge damage and enhanced impermeability.

REFERENCES:
patent: 4251386 (1981-02-01), Saeki et al.
patent: 4356109 (1982-10-01), Saeki et al.
patent: 4552811 (1985-11-01), Brown et al.

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