Cosmetic compositions

a composition and composition technology, applied in the field of cosmetic compositions, can solve the problems of affecting the appearance of skin, affecting the health of the skin, and affecting the effect of skin hydration, so as to prevent or reduce the effect of perspiration on the skin

Inactive Publication Date: 2001-12-27
UNILEVER HOME & PERSONAL CARE USA DIV OF CONOPCO IN C
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008] Some compositions have a substantial viscosity, which may even make them capable of retaining their own shape for a time, because of transient interactions between molecules of a thickening agent in the liquid.
[0032] i) a continuous phase containing water-immiscible liquid carrier and a fiber-forming structurant present in the continuous phase, which is effective to gel the composition upon cooling from a temperature at which the structurant is in solution in the carrier liquid, and

Problems solved by technology

Such gels can be disrupted by shearing and do not recover their viscosity for a long time, if at all unless remelted, although a small partial recovery may be observed.
Rather high processing temperatures may be needed and / or a gel may be formed but then undergo unwanted progressive transformation during storage, such as crystals appearing and growing, softening of the composition or leakage of liquid from it.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0206] The enthalpy of gelation was measured for a number of structuring agents in three liquids. In each case the gels are made to contain 7 to 7.5 wt % of the structurant in the liquid.

[0207] A sample gel, weighing between 18 and 22 mg was placed in a stainless steel calorimeter capsule, which was sealed with an elastomeric O-ring. The capsule was placed in the DSC at room temperature and heated at 10K / minute to 150.degree. C., held at 150.degree. C. for 60 seconds and cooled at 2K / minute to -50.degree. C.

[0208] The procedure was repeated with DC 345 alone. The data recorded for DC 345 was subtracted from the data for the gel, so that the gel formation appears a departure from a flat baseline. The gelation enthalpy was calculated as the area between the peak and the baseline.

[0209] Values of enthalpy (in kJ / mole) were obtained as set out in the following table

1 Liquid DC 345:ISA Isostearyl (80:20 ratio alcohol Structurant DC 345 by weight) (ISA) .alpha.-cellobiose octa- 360 octade...

example 4

[0219] Cellobiose was esterified with nonanoic acid to yield the fully esterified product in the form of its .alpha.-anomer following a procedure generally as described in Takada et al, Liquid Crystals, Volume 19, page 441 (1995).

[0220] The following materials were used:

[0221] .beta.-D-cellobiose, 20 grams, 0.058 moles

[0222] Nonanoic acid, 591.6 grams, 3.74 moles

[0223] Trifluoroacetic anhydride, 297.6 grams, 1.42 moles.

[0224] These materials were obtained from Acros Organics--Fisher Scientific.

[0225] Into a 2 liter flange pot equipped with an overhead stirrer, water condenser and addition inlet was placed the nonanoic acid together with the trifluoroacetic anhydride. The resultant clear mixture was stirred up and heated to 100.degree. C. using a silicone oil bath and temperature probe. During heating it was noted that the colour of the reaction mixture darkened and developed a dark brown tinge. After allowing the mixture to stir for one hour at 100.degree. C., the cellobiose was slo...

example 5

[0233] Opaque emulsion sticks were prepared with formulations as set out in the table below.

[0234] To prepare these sticks, the cyclomethicone was mixed with the other organic liquids (if any) including the cetyl dimethicone copolyol which functioned as an emulsifier (silicone surfactant) and the mixture was heated with gentle stirring to a temperature 5 to 10.degree. C. above the temperature at which the structurant had been found to dissolve in a preliminary test. The esterified cellobiose was then added and allowed to dissolve.

[0235] The disperse phase (also referred to as internal phase) was an aluminium zirconium active dissolved in water or in a mixture of a polyol and water. This disperse phase was pre-heated to the same temperature as the organic oils containing the esterified cellobiose and added slowly to them over a period of one minute while mixing with a Silverson mixer. After addition was complete the formulation was mixed at higher speed for five minutes. Stirring spe...

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Abstract

A cosmetic composition is a structured emulsion of a continuous phase containing water-immiscible liquid carrier plus a structurant, and a disperse phase which is a solution of antiperspirant active in a more polar, probably aqueous, solvent. The structurant is a material which forms a network of fibers in the continuous phase, thereby gelling it. The structurant has an enthalpy of gelation in the carrier liquid or a test liquid with a magnitude of at least 30 kJ / mole. This minimum enthalpy of gelation facilitates processing at conveniently accessible temperatures and promotes stability.

Description

[0001] The present invention relates to cosmetic compositions for application to human skin. Significant forms of the invention are concerned with antiperspirant compositions for application to human skin, especially the axilla. However, the invention can also be applied to other forms of cosmetic composition.BACKGROUND OF THE INVENTION AND SUMMARY OF PRIOR ART[0002] A wide variety of cosmetic compositions for application to human skin make use of a thickened or structured liquid carrier to deliver colour or some other active material to the surface of the skin. A significant example of such cosmetic compositions are antiperspirant compositions which are widely used in order to enable their users to avoid or minimise wet patches on their skin, especially in axillary regions.[0003] Cosmetic compositions have been made in a variety of product forms. One of these is a so-called "stick" which is usually a bar of an apparently firm solid material held within a dispensing container and wh...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K8/02A61K8/06A61K8/26A61K8/28A61K8/00A61K8/31A61K8/34A61K8/37A61K8/58A61K8/60A61K8/63A61K8/72A61K8/73A61K8/89A61K8/891A61K8/894A61K8/898A61Q15/00
CPCA61K8/02A61K8/042A61K8/06A61K8/26A61K8/28A61K8/31A61K8/34A61K8/342A61K8/37A61K8/585A61K8/60A61K8/63A61K8/73A61K8/891A61K8/894A61Q15/00
Inventor FRANKLIN, KEVIN RONALDHOPKINSON, ANDREW
Owner UNILEVER HOME & PERSONAL CARE USA DIV OF CONOPCO IN C
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