| 摘要 |
A method for encapsulating a water soluble reactive agent in an alkyl cellulosic polymer to provide an encapsulated product from which leaching of the reactive agent into an aqueous dentifrice containing another compound reactive with the agent is prevented or controlled, said method comprising the steps of(a) uniformly dispersing the reactive agent in the alkyl cellulose and a solvent for the polymer to form a paste;(b) casting the paste onto a sheet forming substrate;(c) grinding and subdividing the sheet having the reactive agent encased therein into particles of a predetermined size;(d) washing the particles with water to remove any encased agent exposed by the grinding; and,(e) drying the particles of encapsulated reactive agent.
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