Process for producing powder of microcapsules

Details Process for producing powder of microcapsules Process for producing powder of microcapsules

1985-01-28

1986-07-22

Lovering, Richard D.

Plastic and nonmetallic article shaping or treating: processes

Encapsulating normally liquid material

Liquid encapsulation utilizing an emulsion or dispersion to...

71DIG1, 2522997, 252522A, 252601, 264 46, 264 47, 346213, 346215, 424 32, 42721331, 42721334, B01J 1302

Patent

active

046018638

ABSTRACT:
A process for producing a powder of microcapsules characterized by adding an aldehyde resin precondensate to a microcapsule dispersion prepared in water or a hydrophilic medium with use of a water-soluble high molecular compound as an emulsifier, maintaining the resulting mixture in a condition for promoting polycondensation of the precondensate, and removing the dispersing medium from the reaction mixture, and a process for producing a powder of microcapsules characterized by emulsifying a hydrophobic core material containing a specific oil-soluble melamine-formaldehyde resin precondensate in water or a hydrophilic medium, subjecting the emulsion to a condition for promoting polycondensation to form capsule wall films and obtain a microcapsule dispersion, and thereafter removing the dispersing medium from the dispersion are disclosed.
Further, processes for producing a non-aqueous microcapsule composition are also disclosed.

REFERENCES:
patent: 3594328 (1971-07-01), Schibler
patent: 3778383 (1973-12-01), Schibler et al.
patent: 4087376 (1978-05-01), Foris et al.

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