US3535427A - Skin moisturizing concentrate containing lanolin derivatives - Google Patents

Description

United States Patent "ice US. Cl. 424365 3 Claims ABSTRACT OF THE DISCLOSURE A transparent homogeneous, liquid concentrate to be added to bath water is made up of mineral oil (the major ingredient); and acetylated lanolin alcohol or acetylated lanolin, or liquid lanolin; isopropyl myristate or isopropyl palmitate or hexadecyl stearate; sorbitan sesquioleate; polyoxyethylene (5) sorbitan monooleate; and perfume blend.

This application is a continuation-in-part of Ser No. 643,407, filed June 5, 1967, which in turn is a continuation-in-part of Ser No. 383, 992, filed Aug. 17, 1964, both now abandoned.

This invention relates to cosmetic preparations and particularly to a transparent, homogeneous liquid concentrate for addition to bath water. This concentrate is to be added to bath water to impart a desirable softness and smoothness to the skin of the bather.

The preparation of such a bath water concentrate presents many problems. First, it must be quite inexpensive because, since it will be used often and covers nearly the entire skin area, the user will rebel against the constant use of an expensive product. Also, only a small amount must be required for a full quantity of bath water.

The composition should be a liquid so that it can readily be poured and measured out. It must be homogeneous so that the container does not have to be shaken prior to use. Also, it should be transparent so that it has a pleasing appearance.

The concentrate must be fully and readily dispersible in the bath water even though the water is hard due to naturally contained mineral salts. The ingredients of the concentrate must not settle out or form a bath tub ring due to the formation of precipitates. Furthermore the concentrate must not form a surface film on the bath water as this might deposit an excess amount of it on the bather on emerging from the bath.

In like manner, the composition itself must not be of such a nature that it will impart a greasy feel to the skin. This is most important because care will not be observed in adding a fixed amount of it to the bath water and because varying amounts of water are used in tub baths. The concentrate must have about the same skinsoftening effect, therefore, within a wide ratio range of its presence in the bath water.

It is of course vital that the concentrate adhere to the skin in the necessary amount to impart softness. It would obviously be useless if it became removed from the skin as the bather gets out of the water. Additionally, enough of it must remain on the skin after drying with a towel.

Finally, the concentrate must be compatible with all kinds of soap. It must not be destroyed by either soap of the ordinary glyceride-type or by soap of the wide variety of synthetic detergent types such, for example, as the sulfonated and sulfated long-chain alkyl derivatives of benzene and the sulfonated and sulfated long-chain al kanols. And, of course, the concentrate must be com- Patented Oct. 20, 1970 patible with inexpensive perfumes and foaming agents in the event that they are contained in the concentrate or are added separately to the tub water.

The present invention satisfied these many requirements. This is achieved by a combination of ingredients which must be present each within a fairly narrow range. The concentrate will impart a pleasant softness and smoothness to the skin and overcome the dryness which might ocur to the skin if soap alone were used in the bath and none of the concentrate were used.

The concentrate will correct the skin dryness due to erosion of swimming in fresh or in salty water, overexposure to the sun, cold and wind, a naturally dry skin and similar adverse conditions. The concentrate is made up by combining the following ingredients.

INGREDIENTS Parts by weight Part A:

Mineral oil, pharmaceutical grade 65-80, preferably 79.0. Acetylated lanolin alcohol or acetylated lanolin or liquid lanolin 2-10, preferably 4.0. Isopropyl myristate or isopropyl palmitate or hexadecyl stearate 5-20, preferably 11.0. Part B:

Sorbitan sesquioleate such as Arlacel 83) Polyoxyethylene (5) sorbitan monooleate (such as Tween 81) 3-7, preferably 3.8. Perfume blend 0-2, preferably 1.

The Part A and the Part B are seperately mixed by thorough stirring and then B is added to A to form parts of a homogeneous transparent liquid composition. The complete mixture should then be filtered and filled into suitable containers. It is physically stable and remains homogeneous on standing.

In use, about a tablespoon of this liquid concentrate is ordinarily poured in the bath water but as little as half a tablespoonful to five or ten tablespoonfuls may be used to satisfy a personal choice. In such use this composition is diluted with about 2000* parts of water and it is quite readily dispersed uniformly therein to form a fine emulsion of the oil-in-water type. When human skin is immersed in the disperson, it is found that the oil globules are substantive to the epithelial tissues and after drying the skin surface to remove excess water, it has been demonstrated that a thin continuous film of the composition is present.

All of the ingredients of Part A are essential as they separately and conjointly impart the desirable softness and smoothness to the bathers skin. Neither one alone is satisfactory for this purpose as the mineral oil alone would be too greasy and the lanolin ingredient is not sufficiently effective in the necessary small quantities, considering its expense. The mineral oil is the major constituent of the preparation and this is important because it is quite inexpensive. However, it has to be modified by other ingredients because mineral oil alone leaves an unpleasant greasy feel on the skin. The lanolin must be mineral oil soluble and its presence minimizes the greasi ness of the oil. The third ingredient of Part A, such as isopropylmyristate, is especially valuable as a protective emollient as it imparts unusual softness to the skin and this property is retained although it is dissolved in a considerable amount of mineral oil; it could not be used alone because it is expensive.

The perfume blend of Part B can of course be omitted.

1-3, preferably 1.2.

4 The other ingredients of Part B are non-ionic dispersing acetylated lanolin alcohols, liquid lanolin, and mixtures agents which have been found to be especially nonirritatthereof; 20% of a liquid organic fatty acid ester seing to the skin. They are especially effective when comlected from the group Consisting of P PY myristate,

bined in the ratios given, to hold the ingredients of Part isoprohyl P' and hexadecyl Stearate; and A i suspension in the bath Water and yet release them 5 of noniomc, liquid, dispersing agents, consisting of a mixin the bathers Skim ture of sorbitan sesquioleate and polyoxyethylene (5) The preparation is water-free to make sure that it is Sorbltan homogeneous and transparent. It is important that it 1 conPentrate accord'mg to claim 1 in which Said contain no water-insoluble solid or semisolid agents such hqflld dlspersmg agents Conslsts of 1-3% of solhitah as beeswax or petrolatum which would not become disqmoleate and 34% Polyoxyethylene Sorbhah persed throughout the bath water. ooleate' The following specific examples illustrate the inven- T concenihate accordmg to clfhm 1 having the tion. The acetylated lanolin may be Modulan which is following composlhoh 1H P nt by Weight:

supplied by the American Cholesterol Products, Inc. of Min 1 Milltown, NJ. The acetylated lanolin alcohol may be g; 8 gigg g iggg i grade Acetulan and the liquid lanolin may be Viscolan, both Liquid organic fatty acid y f which are pp y this Same P Sorbitan sesquioleate 1 2 725,334, issued to American Cholesterol Products, Inc., Polyoxyethylene (5) sorbitan mo l 3:3 describes a process for making the acetylated lanolin. Perfum blend L0 Examples I H III IV V VI VII VIII IX X XI XII X111 Acetylated lanolin 2.0 i 2.0 2.0 2.0 4, Acetylated lanolin alcohols. 4 0 2,0 10 0 Liquid lanolin. l. Isopropyl myristate Isopropyl palmitate Hexadecylstcarate. Perfume blend 1. O Mineral oil 79.0 Arlacel 83 1. 2 Tween 81 3.8

Pat. 2,758,125 describes a process for making liquid lan- References Cited 01in, this patent being issued to the Malmstrom Chemical Company of Newark, NJ. UNITED STATIES PATENTS The Arlacel s3 and the Tween 81 are supplied by the 3,125,487 3/1964 t inson 424 170 XR Atlas Chemical Industries, Inc., of Wilmington, Del. 0 3,172,816 3/1965 swlhtosky 424172 What is claimed is: 1. A water-free, transparent, homogeneous, skin mois- ALBERT MEYERS Pnmary Exammer turizing liquid concentrate for addition to tub bath water D. R. ORE, Assistant Examiner comprising 65-80% by weight of pharmaceutical grade mineral oil; 210% of a mineral oil soluble lanolin se- US. Cl. X.R. lected from the group consisting of acetylated lanolin, 24170, 238