Process for making solid formulations containing amine oxide surfactants

U.S. Patent Number: 5389306

Abstract: Disclosed is a process for making solid formulations containing amine oxide surfactants. Maleic acid, or a water soluble salt thereof, is admixed with an aqueous liquid amine oxide formulation, which formulation preferably contains from about 20% to about 40% by weight of an amine oxide surfactant. The molar ratio of maleic acid to amine oxide surfactant is at least about 1:1. Admixture pH is maintained at or below, or reduced to at least, about 1 unit below the pKa of the amine oxide to form a visible precipitate therein. The precipitate is separated from the mixture, preferably by mechanical means, and dried. The dried precipitate is a maleic acid-amine oxide salt which can be incorporated into cleaning products, especially solid or granular cleaning products, as a source of amine oxide surfactant.

Inventors: Wierenga; Thomas J. (Cincinnati, OH), Young; Raymond D. (West Chester, OH)

Assignee: The Procter & Gamble Company (Cincinnati, OH)

Application Number: 08/231,415

Issued: 1995-02-14

Expired: 2007-02-14

Classes: 510/445 ; 510/433; 510/457; 510/477; 510/503; 562/582; 564/298

Field of search: 252/547,546,174.19 564/298 562/582

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