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Cosmetic compositions

a composition and cosmetic technology, applied in the field of cosmetic compositions, can solve the problems of white marks, high processing temperature needed in the production of sticks, formulations containing gellants, etc., and achieve the effect of avoiding high processing temperature and being especially valuabl

Inactive Publication Date: 2001-10-25
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

[0017] It is an object of the present invention to provide thickened or structured cosmetic compositions, especially but not exclusively antiperspirant compositions, in which a liquid carrier material is thickened or structured using a structuring agent which is different from those mentioned above. A further object of the invention is to provide a structurant which can have superior properties to at least some of the structurants which have been used previously.
[0019] Certain particularly preferred forms of the invention have the objective of providing compositions which have a measure of clarity, i.e. are translucent or even transparent.
[0026] Ethanol gives a cooling effect on application to skin, because it is very volatile. It is preferred that the content of ethanol or any monohydric alcohol with a vapour pressure above 1.3 kPa (10 mmHg) is not over 15% better not over 8% by weight of the composition.
[0031] One considerable advantage of preferred structurant materials of this invention is that they have a refractive index at a convenient value such that it is not difficult to formulate the rest of the composition to have a sufficiently close refractive index, and in addition the particularly preferred structurants are tolerant of mis-match between their refractive index and the matched refractive indices of the continuous and disperse phases.
[0032] Further advantages of preferred structurant materials of this invention are that they do not require high processing temperatures and that they are chemically stable, both during processing and in the resultant compositions. The avoidance of high processing temperatures can be especially valuable when the composition contains some water or other volatile constituent.

Problems solved by technology

However, fatty alcohol or wax structured sticks tend to leave visible white deposits on application to human skin, and the deposits can also transfer onto clothing when it comes into contact with the skin and the wearer can, for example, find white marks at the armhole of the sleeveless garment.
Formulations containing such gellants can suffer from a number of disadvantages, including instability in the presence of acidic antiperspirants, and comparatively high processing temperatures needed in the production of sticks.
When applied to skin the formulation can be difficult to wash off, but reformulation to overcome that problem can be made impossible by the need for a high processing temperature.
Ethanol gives a cooling effect on application to skin, because it is very volatile.

Method used

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  • Cosmetic compositions
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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0168] 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).

[0169] The following materials were used:

[0170] .beta.-D-cellobiose, 20 grams, 0.058 moles

[0171] Nonanoic acid, 591.6 grams, 3.74 moles

[0172] Trifluoroacetic anhydride, 297.6 grams, 1.42 moles.

[0173] These materials were obtained from Acros Organics--Fisher Scientific.

[0174] 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 2

[0179] Samples of esterified cellobiose prepared in accordance with Example 1 were used to gel various water-immiscible liquids and mixtures of liquids. The procedure was as follows:

[0180] 0.5 grams esterified cellobiose and 9.5 grams of the liquid (or other proportions to give a total of 10 grams) were weighed directly into a 15 gram or 30 gram glass jar. A small magnetic follower was placed in the jar which was then placed on a hot plate. It was stirred and heated until all of the esterified cellobiose had dissolved in the liquid. This "dissolution temperature" was noted. The jar was then removed from the hot plate, the stirrer was removed from the hot liquid in the jar. A thermometer was placed in the liquid and the contents of the jar were then left undisturbed to cool. The gelling temperature, i.e. the temperature at which the contents gelled, was noted. The jar was left to stand for 24 hours and then the contents of the jar were inspected visually, pressed with a probe and cla...

example 3

[0182] Cellobiose was esterified with a less than stoichiometric quantity of nonanoic acid to yield a partially esterified product, following a procedure generally similar to that of Example 1.

[0183] The following materials were used:

[0184] .beta.-D-cellobiose, 2.5 grams, 7.3.times.10.sup.-3 moles

[0185] Nonanoic acid, 5.78 grams, 3.65.times.10.sup.-2 moles

[0186] Trifluoroacetic anhydride, 2.91 grams, 1.38.times.10.sup.-2 moles.

[0187] Into a 3-neck round bottomed flask 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 and heated to 100.degree. C. The colour of the reaction mixture darkened. The cellobiose was slowly added and a grey suspension was formed. The reaction mixture was kept at 100.degree. C. for 6 hours then allowed to cool to ambient laboratory temperature. 100 ml of ice-cold methanol containing 10% water was mixed with the contents of the ...

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Abstract

A cosmetic composition preferably an antiperspirant composition, in solid or soft-solid form has a continuous phase which contains a water-immiscible liquid carrier and also contains a structurant which is partially or fully esterified cellobiose of the formula wherein each Z is independently hydrogen or an acyl group of the formula where R denotes a hydrocarbyl group containing from 4 to 22 carbon atoms. Not more than half of the Z groups are hydrogen.

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] Antiperspirant formulations have been provided with a range of different product forms. One of these is a so-called "stick" which is usually a bar of an apparently firm solid material held within a dispens...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K8/02A61K8/06A61K8/92A61K8/19A61K8/26A61K8/27A61K8/28A61K8/30A61K8/31A61K8/34A61K8/36A61K8/37A61K8/55A61K8/58A61K8/60A61K8/73A61K8/89A61K8/891A61K8/894A61K8/898A61Q15/00A61Q90/00
CPCA61K8/042A61K8/26A61K8/28A61K8/31A61K8/34A61K8/342A61K8/37A61K8/585A61K8/60A61K8/891A61K8/894A61Q15/00
Inventor FRANKLIN, KEVIN RONALDKOWALSKI, ADAM JANPARROTT, DAVID TERENCEROWE, KATHRYN ELIZABETHWHITE, MICHAEL STEPHEN
Owner UNILEVER HOME & PERSONAL CARE USA DIV OF CONOPCO IN C
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