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Stable cosmetic composition

A technology of composition, emollient, applied in the field of emollient composition for skin, capable of solving problems such as pH value not mentioned

Inactive Publication Date: 2000-12-06
UNILEVER NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Further, the '821 application also does not mention any pH and does not use emulsions with different pH

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0070] The pH stability of a composition containing two emulsions, one with a pH of 4 and the second with a pH of 7, was investigated.

[0071] The negative reference (composition outside the scope of the invention) consisted of two oil-in-water emulsions A1 and B1. Each emulsion contained 80% aqueous phase and 20% oily phase. Negative reference compositions containing A1 and B1 in a 1:1 ratio (recipe details in Table 1) were placed side by side in a single compartment bottle.

[0072] The test samples (within the scope of the invention) consisted of a water-in-oil emulsion (formulation C1) and an oil-in-water emulsion (formulation D1). Formulation C1 contained 70% by weight of an aqueous solution and 30% of an oily phase. Formulation D1 contained 80% aqueous phase and 20% oily phase. The test samples consisted of C1 and D1 in a 1:1 ratio (details of formulation are in Table 1) placed side by side in a single compartment bottle. When it was to be applied to the skin, emuls...

example 2

[0081] The pH stability of a composition containing two emulsions (one with a pH of 4 and the second with a pH of 6) was investigated.

[0082] The negative reference (composition outside the scope of the invention) consisted of two oil-in-water emulsions A1 and B2. Each emulsion contained 80% aqueous phase and 20% oily phase. Negative reference compositions containing A2 and B2 in a 1:1 ratio (recipe details in Table 3) were placed side by side in a single compartment vial.

[0083] The test samples (within the scope of the invention) consisted of two emulsions: a water-in-oil emulsion (formulation C2) and an oil-in-water emulsion (formulation D2). Formulation C2 contained 70% by weight of an aqueous phase and 30% of an oily phase. Formulation D2 contained 80% aqueous phase and 20% oily phase. The test samples contained C2 and D2 in a 1:1 ratio (recipe details in Table 3) side by side in a single compartment bottle. To be applied to the skin, lotions C2 and D2 were mixed ...

example 3

[0089] The pH stability of a composition containing two emulsions (one with a pH of 4 and the second with a pH of 10) was investigated.

[0090] The negative reference (composition outside the scope of the invention) consisted of two oil-in-water emulsions A3 and B3. Each emulsion contained 80% aqueous phase and 20% oily phase. Negative reference compositions containing A3 and B3 in a 1:1 ratio (recipe details in Table 5) were placed side by side in single compartment vials.

[0091] The test samples (within the scope of the invention) consisted of two emulsions: a water-in-oil emulsion (formulation C3) and an oil-in-water emulsion (formulation D3). Formulation C3 contained 70% by weight of an aqueous phase and 30% of an oily phase. Formulation D3 contained 80% aqueous phase and 20% oily phase. The test samples contained C3 and D3 in a 1:1 ratio (recipe details in Table 5), which were placed side by side in a single compartment bottle. Just before application to the skin, ...

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Abstract

The inventive compositions contain an oil-in-water and a water-in-oil emulsion, each buffered to a specific pH, so that the difference in pH values of the two emulsions is at least two units. The molecular mixing is minimized by selecting suitable oil and oil phase in a water-in-oil emulsion. The change in pH is further minimized by buffering each emulsion. The particular advantage of the inventive compositions is the ability to separate within a single composition, with minimal intermixing, active compounds which require different pH environments for stability and / or optimum efficacy.

Description

field of invention [0001] The present invention relates to emollient compositions for the skin comprising at least two emulsions in interfacial contact with each other, each emulsion having a different, stably maintained pH environment. Background of the invention [0002] Emollient products that improve the appearance of the skin are increasingly popular with consumers. Consumers are often trying to alleviate or delay the signs of aging or photoaging skin, such as fine lines and wrinkles, dryness and saggy, sagging skin. At the same time, consumers are also looking for benefits other than anti-aging, which requires manufacturers to incorporate some other ingredients into emollient products. Also, manufacturers of the emollient industry are constantly seeking to improve antiaging effects by combining antiaging ingredients. [0003] Unfortunately, it is often difficult to combine various active ingredients and still maintain their optimal stability. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61K8/03A61K8/06A61K8/19A61K8/30A61K8/34A61K8/36A61K8/365A61K8/37A61K8/41A61K8/44A61K8/67A61K8/72A61K8/73A61K8/891A61K8/92A61Q19/00A61Q19/08C09K23/00
CPCA61Q19/00A61K8/062A61K8/671A61K8/06Y10S514/944A61K8/365A61K8/064A61Q19/08A61K8/676Y10S514/938A61P17/00
Inventor S·慕克吉S·S·哈比夫D·里克
Owner UNILEVER NV