Compositions – Preservative agents – Anti-corrosion
Patent
1975-04-04
1978-05-16
Lovering, Richard D.
Compositions
Preservative agents
Anti-corrosion
71 64F, 106308M, 106312, 252182, 252426, 252522, 260 25B, 424 19, 424 33, 426 89, B01J 1302
Patent
active
040898008
ABSTRACT:
Void-containing microcapsules are prepared by a method featuring gellation of an organic polymer with the simultaneous precipitation of an organic liquid non-solvent. The method involves the preparation of a solution containing an organic polymer, a good solvent for the polymer and an organic liquid non-solvent which is miscible with the polymer solvent. The solution is then atomized into a bath containing a liquid which is miscible with the good polymer solvent but which is immiscible with the organic liquid non-solvent. The bath liquid extracts out the good polymer solvent, causing gellation of polymer around discrete droplets of the organic liquid non-solvent, which simultaneously precipitates out of the solution as the good polymer solvent is extracted, thereby producing microcapsules having encapsulated therein the non-solvent. The organic liquid non-solvent can then be removed as by evaporation to provide void-containing microcapsules. These void-containing microcapsules may be employed as opacifying agents. In addition to producing void-containing microcapsules, this method can be utilized to produce microcapsules in which pigments are entrapped in the voids or the polymeric walls of the microcapsules or in which certain non-solvents which serve a secondary function remain entrapped in the microcapsules. Such non-solvents include, for instance, vitamins, minerals, biocides, perfumes, chemical reactants, fertilizers, and the like.
REFERENCES:
patent: 3558507 (1971-01-01), Harbort
patent: 3664963 (1972-05-01), Pasin
patent: 3669899 (1972-06-01), Vassiliades et al.
patent: 3691090 (1972-09-01), Kitajima et al.
patent: 3784391 (1974-01-01), Kruse et al.
Lovering Richard D.
PPG Industries Inc.
Troy Frank J.
Wilson Charles R.
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