C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/536.9
C07C 409/34 (2006.01)
Patent
CA 1177847
ABSTRACT OF THE DISCLOSURE A method for the preparation of benzoyl peroxide in crystalline form, which crystals may range in size below 10 microns, com- prises forming a first solution of the benzoyl peroxide in a precipitate promoting material, adding the First solution to a second solution comprising an aqueous solution of a dispersant, to precipitate the benzoyl peroxide in the desired crystalline form, and finally recovering the crystalline benzoyl peroxide from the first and second solutions. The precipitate promoting material may be selected from sulfur-containing aliphatic ethers, long-chain aliphatic and araliphatic ethers, ethylene oxide derivatives, and mixtures thereof. The dispersant may be se- lected from cellulosic derivatives, anionic surfactants, non- ionic surfactants, colloidal inorganic materials, and mixtures thereof. The present method may be performed at room tempera- ture and is therefore safe and energy conservative. The result- ing benzoyl peroxide crystals are of desirably reduced size, and are particularly well suited for incorporation into commercial cosmetic and pharmaceutical preparations.
411660
Macrae & Co.
Warner-Lambert Company
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