US2237629A - Shampoo - Google Patents

Description

Patented Apr. 8, 11

I ll,

John w. Orelu ,Summlt, N. s.

No Drawing. Application July 25, 1935,

- Serial No. 33,057

4 Claims.

My present invention relates to an improvement in hair washes or shampoos.

Many attempts have been made to provide materials other than soap for washing the hair for the purpose of avoiding the usual destructive action of soap. The normal action of even a neutral soap when put into solution is to set free as much as one-half of its alkali. This alkali has a destructive action upon the hair fiber. Moreover, human hair normally has deposited upon it a sheath of lime and magnesium deposits consisting of carbonates, lime and magnesium soaps formed from the natural oils on the hair. Ordinary washing with soap will not remove these coatings and the hair retains its dull, lustreless appearance. Neutral sulphonated castor and other oils do not foam and leave the hair slightly sticky.

Furthermore, many of these sulphonated products which are used in shampoos to avoid the result of the action of soap on hair, have themselves the harmful characteristic of causing a great amount of drying of the scalp due to a large water absorption.

The presence of considerable amounts of immersing a swatch of it in a dilute solution of hydrochloric acid; bubbles of carbondioxide are set free.

- I have found that the salts of sulphonic esters I of the monoethanolamides of the cocoanut fatty acids do not hydrolize to free alkali to attack the hair, nor do they have the property of causing an unhealthy removal of cell water which results in a drying of the scalp. The ethanolamine salts,

especially the monoethanolamine salt and the ammonium salts, are of greater advantage than the sodium and other salts due to their higher foaming power and property of remaining liquid in concentrated solution. No lime or other insoluble salts are formed when using hard water, and the insoluble soaps previously deposited upon the hair by washing with hard water are removed. A good foam is obtained, and due to the high detergent value the hair is cleaned completely in one wash and rinsing, whereas with soap several washings and many rinsings are required. Some of the advantages of the salts of sulphonic esters of alkanolamides of fatty acids are still retained by mixing with soap. Among these may be mentioned the high detergent values and resistance to hard water. Mixtures up to .with soap can be used. The following are examples of my improved liquid hair shampoo:

Per cent Monoethanolamine salt of the sulphonic ester of monoethanolamide of the cocoanut fatty The sulphonic esters of the monoethanolamides of the cocoanut fatty acids are best prepared in accordance with the methods set forth in my United States Letters Patent No. 1,981,792. While inferior for the purpose to the non-metallic soluble salts specified, the sodium salts of my improved detersive agents may also be employed.

1 claim:

- 1. An improved shampoo. containing as the active ingredient the monoethanolamine salt of the sulphonic esters of monoethanolamide of the cocoanut fatty acids in an aqueous vehicle.

2. An improved shampoo containing as the active ingredient the ammonium salt of the sulphonic esters of monoethanolamide of the cocoanut fatty acids in an aqueous vehicle.

3. An improved shampoo containing as the active ingredient a water soluble non-metallic salt of the sulphonic esters of monoethanolamide of the cocoanut fatty acids in an aqueous vehicle.

4. improved shampoo, containing as the active ingredient a water soluble salt of the sulphonic esters of monoethanolamide of the cocoanut fatty acids in an aqueous vehicle, said ingredient being characterized by high foaming power due to the absence of formation of lime or other insoluble salts. the property of remaining liquid in concentrated solution, high detergent value, and the property of being non-injurious to the scalp or hair due to low imbibation and the absence of the formation of free alkali.

JOHN W. ORELUP.