Compositions – Preservative agents – Anti-corrosion
Patent
1977-02-16
1978-08-15
Lovering, Richard D.
Compositions
Preservative agents
Anti-corrosion
264 4, 424 19, 424 33, 424 35, 424230, 424271, 427339, 427340, 427352, B01J 1302
Patent
active
041070712
ABSTRACT:
Microcapsules having a capsule core material surrounded by a relatively impermeable, densified protective wall and a method of producing such microcapsules are disclosed. To produce the microcapsules, an agitated system is provided including a liquid vehicle as a major component of the system and constituting a continuous first phase of the system. A plurality of discrete capsule core material entities are dispersed in the liquid vehicle and constitute a discontinuous second phase. A film-forming, cross-linkable, polymeric base material is also present in the liquid vehicle and, upon induction of phase separation within the agitated system, forms a sheath about the capsule core material entities. The formed sheath also contains entrapped liquid vehicle; however, a major portion of the entrapped liquid vehicle is subsequently extracted from the sheath, and the resulting densified polymeric base material in the sheath is then cross-linked to form a densified protective wall around the capsule core material.
REFERENCES:
patent: 3242051 (1966-03-01), Hiestand et al.
patent: 3674704 (1972-07-01), Bayless et al.
patent: 3726804 (1973-04-01), Matsukawa et al.
patent: 3816331 (1974-06-01), Brown, Jr. et al.
Capsulated Systems, Inc.
Lovering Richard D.
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