Microcapsules and microcapsule production process

Details Microcapsules and microcapsule production process Microcapsules and microcapsule production process

1988-12-16

1991-04-30

Lovering, Richard D.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

42840221, 503215, B01J 1316

Patent

active

050116347

ABSTRACT:
The invention relates to a process for producing microcapsules by microencapsulating hydrophobic oils, particularly with substances contained therein, in which the hydrophobic oil is mixed, accompanied by vigorous stirring, into an aqueous medium containing a dispersion-stabilizing compound. The resulting oil-in-water dispersion is acid adjusted, aminoplastic capsules are formed in the conventional manner and the aqueous fraction of the aqueous medium is removed in the usual way. The aqueous medium contains a water-soluble, cationic compound such that it forms a dispersion-stabilizing compound in interaction with the water-soluble, anionic, sulphonated melamine-formaldehyde precondensate. The microcapsules obtained according to this process can be obtained economically without agglomerate formation in the form of dry single capsules e.g. by spray drying the aqueous capsule dispersion obtained. The invention also permits the encapsulation of random substances in dissolved and/or finely dispersed form.

REFERENCES:
patent: 3594328 (1971-07-01), Schibler et al.
patent: 3607775 (1971-09-01), Yoshida et al.
patent: 3778383 (1973-12-01), Schibler et al.
patent: 4328119 (1982-05-01), Iwasaki et al.
patent: 4396670 (1983-08-01), Sinclair
patent: 4406816 (1983-09-01), Sliwka
patent: 4824823 (1989-04-01), Pietsch et al.
patent: 4965025 (1990-10-01), Pietsch et al.

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