Multiple phase compositions

Details Multiple phase compositions Multiple phase compositions

1999-09-28

2001-01-30

Gupta, Yogendra (Department: 1751)

Cleaning compositions for solid surfaces, auxiliary compositions

Cleaning compositions or processes of preparing

Liquid composition

C510S434000

Reexamination Certificate

active

06180587

ABSTRACT:

BACKGROUND OF THE INVENTION
Cleansing compositions are generally a single phase or an oily phase dispersed in a watery cleansing phase. When significant quantities of an oily phase are present, particularly to apply skin conditioning via emolliency with lipophilic type components, substantial efforts are usually made to provide a stable emulsion, which does not come apart. However, there can be significant advantages to having two or more phases present in a single container during non-use. These phases can be appealing to the eye depending upon various agents; particularly coloring agents dispersed therein or particles present at the interface of the phases. A small amount of shaking by the user prior to end use can create mixing of the phases and at times a bubbly-type appearance. Emulsion(s) can be formed during the mixing and can be present during the actual cleansing. Upon nonagitation, the phases once more readily separate into two or more phases and are ready for the next cleansing, for example, twenty-four hours later when using a shower gel. Though, lower viscosities are acceptable for products such as bath foam, higher viscosities are preferred for certain products such as shower gels, cream-like compositions, and the like.
However, making two aqueous phases is not readily achievable. Secondly, the selective thickening of one aqueous phase, as opposed to the second, is also not readily achievable.
SUMMARY OF THE INVENTION
In accordance with the invention, there is a composition comprising a lower aqueous phase having therein from at least about 1% desirably at least about 2 wt. % of the composition of a hydrophilic polymer or copolymer selected from the group consisting of polyacrylate, polystyrene sulfonate, polyvinylpryrrolidone, or maleic anhydride and mixtures thereof and an upper aqueous phase having therein a cleansing effective amount of a surfactant or mixture thereof.
When the lower polymer phase is formed, it is desirable that at least about 10% of the volume of the composition be in the lower phase.
It is preferred that the viscosity of the composition when mixed should be at least 200 centipoise and no more than about 15,000 centipoise.
Though selective choice of polymers a third phase can be formed. This phase is a second aqueous polymer phase below the first aqueous polymer phase. This results in a three phase composition having a surfactant phase which lies above a first polymer place and the first polymer phase lies above a second polymer phase.


REFERENCES:
patent: 3718609 (1973-02-01), Weimer
patent: 4125156 (1978-11-01), Glinsman
patent: 4337159 (1982-06-01), Reed et al.
patent: 4439345 (1984-03-01), Duke
patent: 4635722 (1987-01-01), Carlin
patent: 62-263297 (1987-11-01), None

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