METHOD FOR DETERMINING RINSE PROPERTIES

Abstract

A method of measuring rinse properties of a composition from a surface. The method includes providing a treatment composition comprising a UV fluorescent dye. The method also includes taking a first image of a surface. The method also includes applying the treatment composition to the surface after taking the first image. The method also includes taking a second image of the surface after applying the treatment composition to the surface. The method also includes rinsing the surface with water after taking the second image. The method also includes taking a third image of the surface after rinsing the surface. The method also includes analysing the first image, the second image, and the third image to quantify an amount of the treatment composition remaining on the surface after rinsing the surface.

Claims

1. A method of measuring rinse properties of a composition from a surface, the method comprising: providing a treatment composition comprising a UV fluorescent dye; taking a first image of a surface; applying the treatment composition to the surface after taking the first image; taking a second image of the surface after applying the treatment composition to the surface; rinsing the surface with water after taking the second image; taking a third image of the surface after rinsing the surface; and analysing the first image, the second image, and the third image to quantify an amount of the treatment composition remaining on the surface after rinsing the surface.

2. The method of claim 1, further comprising: rising the surface with water after taking the third image; and taking a fourth image of the surface after rising the surface after taking the third image.

3. The method of claim 2, further comprising waiting a time between 4 seconds and 120 seconds after taking the third image before rinsing the surface.

4. (canceled)

5. The method of claim 1, wherein the water is a flow of water.

6. The method of claim 1, further comprising correlating an amount of the treatment composition remaining on the surface after rinsing the surface to an amount of the water used to rinse the surface.

7. The method of claim 1, wherein the first image is taken when the surface is wet.

8. The method of claim 1, wherein the surface is hair or skin.

9. The method of claim 8, wherein the surface is hair.

10. The method of claim 1, wherein the treatment composition is a cosmetic composition.

11. The method of claim 10, wherein the composition is a structured composition that comprises a molecular orientation that forms a gel phase or a lamellar phase.

12. The method of claim 1, further comprising: providing a second treatment composition; taking a fourth image of the surface; applying the second treatment composition to the surface after taking the fourth image; taking a fifth image of the surface after applying the second treatment composition to the surface; rinsing the surface with water after taking the fifth image; taking a sixth image of the surface after rinsing the surface after taking the fifth image; analysing the fourth image, the fifth image, and the sixth image to quantify an amount of the second treatment composition remaining on the surface after rinsing the surface; and comparing rinse properties of the treatment composition and the second treatment composition to determine relative rate of rinsing of the treatment composition and the second treatment composition.

13. A method comprising: rinsing a first surface; taking a first image of the first surface after rinsing the first surface; applying a first treatment composition to the first surface after taking the first image; taking a second image of the first surface after applying the first treatment composition; rinsing the first surface after taking the second image; taking a third image of the first surface after rinsing the first surface; and analysing the first image, the second image, and the third image to determine a first amount of the first treatment composition remaining on the first surface.

14. The method of claim 13, further comprising: rinsing a second surface; taking a fourth image of the second surface after rinsing the second surface; applying a second treatment composition to the second surface after taking the fourth image; taking a fifth image of the second surface after applying the second treatment composition; rinsing the second surface after taking the fifth image; taking a sixth image of the second surface after rinsing the second surface; and analysing the fourth image, the fifth image, and the sixth image to determine a second amount of the second treatment composition remaining on the second surface.

15. The method of claim 14, further comprising comparing the first amount and the second amount to determine a relative rate of rinsing of the first treatment composition and the second treatment composition.

16. The method of claim 14, wherein: the first treatment composition is a fluorescer; and the second treatment composition is a fluorescer.

17. The method of claim 14, wherein: the first treatment composition is configured to form a gel phase or a lamellar phase; and the second treatment composition is configured to form a gel phase or a lamellar phase.

18. The method of claim 14, wherein: the first treatment composition is a shampoo or a conditioner; and the second treatment composition is a shampoo or a conditioner.

19. The method of claim 14, wherein: the first treatment composition comprises an ultraviolet dye; and the second treatment composition comprises an ultraviolet dye.

20. The method of claim 14, further comprising: placing the first surface in an ultraviolet viewing cabinet after rinsing the first surface and prior to taking the third image; and placing the second surface in the ultraviolet viewing cabinet after rinsing the second surface and prior to taking the sixth image.

21. The method of claim 14, wherein: analysing the first image, the second image, and the third image to determine the first amount comprises comparing first red green blue (RGB) values of the first image, second RGB values of the second image, and third RGB values of the third image; and analysing the fourth image, the fifth image, and the sixth image to determine the second amount comprises comparing fourth RGB values of the fourth image, fifth RGB values of the fifth image, and sixth RGB values of the sixth image.

Description

EXAMPLES

[0084] Embodiments of the invention will now be illustrated in the following examples, in which amounts are given by weight of the total composition, unless otherwise stated.

Example 1

Compositions A, B, C and D, for Use in the Method of the Invention

[0085] The following hair conditioner compositions were prepared: Compositions A-D were hair conditioners. A and C comprise as Acrylates/Beheneth-25 Methacrylate Copolymer, which increases the rate of rinse from the surface of the hair.

TABLE-US-00001 TABLE 1 Compositions of conditioners A and B for use in the method of the invention A B Ingredient Quantity [wt %] Quantity [wt %] Cetearyl Alcohol 3.2 3.2 Behenyltrimonium Chloride 2.3 2.3 Conditioning silicone 1.4 1.4 Fragrance 0.6 0.6 Acrylates/Beheneth-25 0.25 — Methacrylate Copolymer UV Fluorescer (Tinopal 0.1 0.1 CBS-X ex BASF) Preservative 0.1 0.1 water To 100 To 100

TABLE-US-00002 TABLE 2 Compositions of conditioners C and D for use in the method of the invention C D Ingredient Quantity [wt %] Quantity [wt %] Behentrimonium Chloride 1.4 1.4 Cetearyl Alcohol 3.1 3.1 Conditioning silicone 1.4 1.4 Stearamidopropyl Dimethylamine 0.3 0.3 Fragrance 0.6 0.6 Acrylates/Beheneth-25 0.500 — Methacrylate Copolymer Lactic Acid 88% 0.1 0.1 Sodium Chloride 0.1 0.1 Preservative 0.1 0.1 UV Fluorescer (Tinopal 0.1 0.1 CBS-X ex BASF) Water To 100 To 100

[0086] The conditioners A -D were prepared using the following methods: [0087] 1. Water was added to a suitable vessel, lactic acid (if present) and copolymer (if present) were added, and the vessel heated to 80 ° C. The UV fluorescer was added. [0088] 2. Cetearyl alcohol was then added to the formulation along with tertiary amine salt (if present) [0089] 3. At 80° C. the Behenyltrimmonium Chloride was added (if present) and the resultant mixture mixed. [0090] 4. The heat was then turned off and quench water added. [0091] 5. The mixture was then cooled to below 40° C. and the rest of the materials were added. [0092] 6. Finally, the formulation was mixed at high shear on a Silverson mixer at 5000 rpm for 5 minutes.

Example 2

Measurement of UV Fluorescer on the Surface of Hair, Following Treatment with Compositions A-D

[0093] The hair used in the following examples was dark brown European hair switches. [0094] 1. Hair switches were pre-washed with 14% SLES-1EO solution to remove any surface contamination before starting any treatment. Each switch was treated with 0.1 mL solution per g of hair and lathered for 30 s before being rinsed in warm water (35° C.-40° C., flow-rate 4 L min−1) for 30 s. The hair was combed and excess water squeezed out with the index and middle finger. [0095] 2. A first image was taken of the wet switch (image 1). [0096] 3. 2.0g of UV conditioner A, B, C or D was applied onto the switch and spread evenly across the surface of the switch. [0097] 4. A second image was taken of the treated switch (image 2). [0098] 5. The conditioner covered switch was then placed under a flow of water (1L/min) for the desired amount of time (in this case 5s). At the end of the rinse time the switch was removed from the flow of water. [0099] 6. Without disrupting the surface of the switch, an image was taken (image 3). [0100] 7. Steps 5 and 6 were repeated. [0101] 8. The amount of conditioner remaining on the hair after rinsing was assessed using the following method:

[0102] The hair was placed in a UV viewing cabinet. Image analysis was performed using a suitable commercially available image analysis software, in this case, Adobe Photoshop CS5, utilising the smart grab tool to highlight the switch and the histogram tool to capture the RGB values. The higher the RGB value the brighter the switch and therefore the more conditioner present on the switch.

[0103] The results are given in the following tables:

TABLE-US-00003 TABLE 3 UV analysis of hair treated with Compositions A and B (Comparison of % colour change for B against A (mean +/− s.d., n = 3)) Colour change at Colour change at Colour change at Colour change at 25 s normalised STDEV 30 s normalised STDEV 35 s normalised STDEV 40 s normalised STDEV A 87.72 1.80 88.40 1.95 92.73 3.28 93.36 1.10 B 91.41 2.07 96.28 1.56 95.09 1.18 94.98 0.78

TABLE-US-00004 TABLE 4 Amount (% of original amount of conditioner) conditioner remaining on hair following rinsing: Conditioner B against Conditioner A (mean +/− s.d., n = 3) Amount (%) of conditioner remaining as a function of RGB 25 s 30 s 35 s 40 s B 12.28 11.60 7.27 6.64 A 8.59 3.72 4.91 5.02

TABLE-US-00005 TABLE 5 Results of the Tukey Kramer multiple comparison test. Composition Connecting letter A - 30 s A A - 35 s A B A - 40 s A B B - 40 s A B C B - 35 s B C

TABLE-US-00006 TABLE 6 UV analysis of hair treated with Compositions C and D (Comparison of % colour change for D against C (mean +/− s.d., n = 3)) Colour change at Colour change at Colour change at 20 s normalised STDEV 25 s normalised STDEV 30 s normalised STDEV D 79.27 4.24 80.98 9.19 99.14 1.34 C 88.09 1.79 93.85 1.18 99.55 0.47

TABLE-US-00007 TABLE 7 Table 4: Amount (% of original amount of conditioner) conditioner remaining on hair following rinsing: Conditioner D against Conditioner C (mean +/− s.d., n = 3) Amount (%) of conditioner remaining as a function of RGB 20 s 25 s 30 s D 20.73 19.02 0.86 C 11.91 6.15 0.45

TABLE-US-00008 TABLE 8 Results of the Tukey Kramer multiple comparison test. Composition Connecting letter C - 30 s A D - 30 s A C - 25 s A B C - 20 s B C D- 25 s C D - 20 s C

[0104] In conclusion the method of the invention enables rinse properties to be measured accurately for different types of composition.