US2599665A - Acid shampoo - Google Patents

Description

Patented June 10, 1952 UNITED STATES PATENT OFFICE 2,599,665 AGID SHAMPOO Alfred W. Stephan, BaldwimN. Y., assignor to Natcon Industries, Incorporated;- New Yer-1d N. Y., a corporation of New York No Drawing. Application March 9, 1950, Serial NO. 148341 2 Claims. 1

The present invention relates to a shampoo composition.

Desiderata in a composition which is designed to be used as a shampoo are:

(a) That it be possessed of such detergent qualities as to enable it thoroughly to cleanse the hair and scalp washed therewith, without however removing so much oil from the hair and scalp as to leave these in excessively dry state;

(b) That it does not leave a scum or precipitate on the hair and scalp, but that it be rather readily and completely rinsable therefrom, leaving the washed hair and scalp clean and free from dirt, inorganic salts and the like;

That its acidity be less than pH=7 and preferably substantially the same as that of the skin (pH=5.5-6) so that there is no chemical reaction, or a minimum of such reaction, between the skin and the shampoo, whereby in effeet the shampoo is neutral to the skin;

(d) That it be stable in aqueous solution and form a stable and abundant foam.

A primary object of the present invention is the embodiment of a shampoo composition which adequately satisfies all the afore-enumerated requisites of a good shampoo composition.

This object-as well as other objects and advantages of the invention which will be manifest to the skilled in the art from the present specificationis realized by the composition established according to the detailed indications hereinafter set forth.

Thus, the presently-preferred shampoo composition is constituted by the following ingredients: I

Per cent by weight Ammonium chloride 2.7 Water 55.0 Sipon L-20 (lauryl sulfate) 33.4 Sorbitol-borate solution 8.9

Total 100.0

This shampoo has a pH of 5.5 to 6.0. Three drops of such composition, in 30 cubic centimeters of water will, upon shaking, yield a foam having a volume of about 110 cubic centimeters. Moreover, the foam does not begin to disintegrate under 20 to 30 minutes and will last approximately two hours. In use, it is completely and readily rinsable and leaves no residue. It is thus clear that it satisfies the introductorily enumerated desiderata.

A preferred method of compounding the composition is as follows:

The ammonium chloride is dissolved in the water, in the proportions above indicated. This has to be a homogeneous solution before the sorbitol-borate solution is added. Gentle stirring is effected during the addition of the latter. When a homogeneous mixture has been produced, the indicated quantity of Sipon IP20, aqueous lauryl sulfate, is added. Stirring is continued until complete homogeneity is realized.

The ammonium chloride effects the function of a viscosity-imparting agent. The quantity thereof may be increased or decreased as desired to vary the viscosity of the product, pro vided the other conditions herein stipulated are maintained. The sorbitolborate exerts a buffer action to maintain the desired pH magnitude. The quantity of this ingredient may also be increased to vary the pH, always however within the indicated limits (pH of 5.5 to 6, or less than 7). TheSipon L-20 is lauryl sulfate in liquid form. This is the detergent-proper of the composition. Its stability in slightly acid aqueous medium adapts it excellently for the purposes of the shampoo composition according to the present invention.

The sorbitol-boiate solution may preferably :be prepared as follows:

Dissolve about 4 parts by weight of boric acid in parts by weight of water, using heat if necessary to effect complete dissolution. Cool the solution and then add 12 parts of a aqueous solution d-sorbitol (available on the market as Sorbo, product of Atlas Powder Company, Wilmington, Delaware).

The Sipon L-20 may be obtained from American Alcolac Corporation, New York, N. Y.

Thus, in accordance with the foregoing preferred method of compounding the composition, the ammonium chloride comprises about 3% by weight of the shampoo, the aqueous laryl sulfate (Sipon L-ZO) about 33% by weight, the 70% by weight aqueous solution of sorbitol-borate about 9% and water about 55% by weight of the shampoo composition.

Having thus disclosed the principle of the invention, in a presently-preferred embodiment thereof, and a preferred method of making such embodiment, what is claimed is:

1. An acid shampoo which has a pH of more than 5.5 and less than 7, is stable in aqueous solution, forms a stable and abundant aqueous foam, and consists of about 3% of ammonium chloride, about 33% of lauryl sulfate aqueous solution, about 9% of a 70% by weight aqueous solution of sorbitol-borate and water.

2. An acid shampoo which has a pH of 5.5-6, is stable in aqueous solution, forms a stable and abundant aqueous foam, and corresponds to the following composition:

Per cent by Weight Ammonium chloride 2.7 Water 55.0 Lauryl sulfate solution 33.4

70% by weight aqueous solution of sorbitolborate Total I 100.0

ALFRED W. STEPHAN.

REFERENCES CITED I The following references are of record in the file of this potent:

4 UNITED STATES PATENTS OTHER REFERENCES Atlas Sorbitol," Atlas Powder Co., Wilmington 99, Del., 1947, pages 2, 11 and 19.

Claims (1)

1. AN ACID SHAMPOO WHICH HAS A PH OF MORE THAN 5.5 AND LESS THAN 7, IS STABLE IN AQUEOUS SOLUTION, FORMS A STABLE AND ABUNDANT AQUEOUS FOAM, AND CONSISTS OF ABOUT 3% OF AMMONIUM CHLORIDE, ABOUT 33% OF LAURYL SULFATE AQUEOUS SOLUTION, ABOUT 9% OF A 70% BY WEIGHT AQUEOUS SOLUTION OF SORBITOL-BORATE AND WATER.