Compositions – Preservative agents – Anti-corrosion
Patent
1976-04-02
1977-05-24
Lovering, Richard D.
Compositions
Preservative agents
Anti-corrosion
282 275, 427339, 428307, 428914, B01J 1302
Patent
active
040254550
ABSTRACT:
This invention relates to a process for forming microcapsules comprising the steps of preparing an aqueous solution containing a hydroxypropylcellulose wall forming compound, the hydroxypropylcellulose wall forming compound containing reactive hydroxyl groups and being characterized by having decreasing solubility with increasing temperature in aqueous solution. An oil solution is prepared containing an oil soluble cross-linking agent for the hydroxypropylcellulose wall forming compound in an oil to be encapsulated, the oil soluble cross-linking agent being a polyfunctional isocyanate containing more than one group capable of reacting with hydroxyl groups to provide cross-linkage with the hydroxypropylcellulose wall forming compound. The aqueous solution containing hydroxypropylcellulose is mixed with the oil solution containing the cross-linking agent in a manner such that an emulsion is formed having droplets of the oil solution dispersed in the aqueous solution. The mixture is heated to a temperature of from about 45.degree. C to about 52.degree. C to cause the formation of a precipitate of the hydroxypropylcellulose wall forming compound on the droplets of the oil solution, the precipitate resulting from the interaction of the hydroxypropylcellulose wall forming compound and the polyfunctional isocyanate cross-linking agent to form microcapsule walls. The temperature of the heated mixture is maintained at a temperature and for a time sufficient to permit the microcapsule walls to become substantially oil and water impermeable. This invention also relates to the microcapsules produced by the process of this invention.
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Lovering Richard D.
The Mead Corporation
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