Process for the microencapsulation of water-emulsifiable non-the

Details Process for the microencapsulation of water-emulsifiable non-the Process for the microencapsulation of water-emulsifiable non-the

1992-02-26

1997-06-24

Lovering, Richard D.

Coating processes

Medical or dental purpose product; parts; subcombinations;...

Particulate or unit-dosage-article base

106820, 264 41, 264 46, 424494, 424497, 514820, B01J 1304, C04B 2442

Patent

active

056415354

ABSTRACT:
The invention relates to a process for the preparation of microencapsulated flakes or powders by drying aqueous mixtures containing (a) one or more water-emulsifiable, non-thermoplastic compounds which have a higher boiling point than water and (b) at least one water-soluble, film-forming polymer, in which the content of component (a) is up to about 95% by weight, based on the dry weight of components (a) and (b), with the proviso that the water-soluble, film-forming polymer has a flocculation point of from 20.degree. to 98.degree. C. or the flocculation point is adjusted to from 20.degree. to 98.degree. C. with the aid of additives, and drying is carried out by thin-layer drying in a temperature range above the flocculation point.

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