Method of producing delayed release of sodium fluoride

Details Method of producing delayed release of sodium fluoride Method of producing delayed release of sodium fluoride

1978-06-05

1980-09-02

Silverberg, Sam

Compositions

Preservative agents

Anti-corrosion

424 52, 427 3, B01J 1302, B44D 102

Patent

active

042205522

ABSTRACT:
A process of pretreating a lower alkyl cellulose, such as ethyl cellulose, which is to be used in microencapsulation of sodium fluoride for dental purposes. This process comprises dispersing a predetermined quantity of lower alkyl cellulose in an aqueous mineral acid, such as HCl, and stirring and aqueous washing of the cellulose such that the pH of the product is adjusted to 6.0 or less. This product is later dissolved in a BTX (benzene, toluene, xylene) solvent such as toluene. Sodium fluoride is added and process steps such as baffle stirring and drying are utilized to produce microencapsulation of the sodium fluoride with the lower alkyl cellulose. The process produces an encapsulating material of optimum sodium content and gives release time in water of 2.3-7.0 hours for the sodium fluoride.

REFERENCES:
patent: 1448091 (1923-03-01), Seel
patent: 2840485 (1945-06-01), Greminger
patent: 3312594 (1967-04-01), Cyr
patent: 3345265 (1967-10-01), Grodberg
patent: 3415758 (1968-12-01), Powell
patent: 3951851 (1976-04-01), Kitajima

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