METHOD FOR DETERMINING RINSE PROPERTIES

Abstract

A method of measuring rinse properties of a composition from a surface, the method includes providing a cosmetic treatment composition. The method also includes applying the cosmetic treatment composition to a surface. The method also includes rinsing the surface with a first amount of water after applying the cosmetic treatment composition to the surface. The method also includes collecting a portion of the first amount of water after rinsing the surface with the first amount of water. The method also includes measuring a first turbidity of the portion of the first amount of water after collecting the portion of the first amount of water.

Claims

1-7. (canceled)

8. A method of measuring rinse properties of a composition from a surface, the method comprising: providing a cosmetic treatment composition; applying the cosmetic treatment composition to a surface; rinsing the surface with a first amount of water after applying the cosmetic treatment composition to the surface; collecting a portion of the first amount of water after rinsing the surface with the first amount of water; and measuring a first turbidity of the portion of the first amount of water after collecting the portion of the first amount of water.

9. The method of claim 8, further comprising: rinsing the surface with a second amount of water after measuring the first turbidity; collecting a portion of the second amount of water after rinsing the surface with the second amount of water; and measuring a second turbidity of the portion of the second amount of water after collecting the portion of the second amount of water.

10. The method of claim 9, further comprising waiting a time period after measuring the first turbidity and before rinsing the surface with the second amount of water, the time period being between 4 seconds and 120 seconds, inclusive.

11. The method of claim 8, wherein the first amount of water is from a flow of water.

12. The method of claim 8, further comprising correlating the portion of the first amount of water to the first amount of water.

13. The method of claim 8, wherein the surface is a portion of hair or a portion of skin.

14. The method of claim 8, wherein the cosmetic treatment composition is a structured composition that comprises a molecular orientation that forms a gel phase or a lamellar phase.

15. The method of claim 8, further comprising: determining first rinse properties for the cosmetic treatment composition after measuring the first turbidity; providing a second treatment composition after measuring the first turbidity; applying the second treatment composition to the surface; rinsing the surface with a second amount of water after applying the second treatment composition to the surface; collecting a portion of the second amount of water after rinsing the surface with the second amount of water; measuring a second turbidity of the portion of the second amount of water after collecting the portion of the second amount of water; determining second rinse properties for the second treatment composition after measuring the second turbidity; and comparing the first rinse properties and the second rinse properties to determine a relative rate of rinsing of the cosmetic treatment composition and the second treatment composition.

16. The method of claim 15, further comprising comparing the first turbidity and the second turbidity to determine a first difference.

17. The method of claim 16, further comprising: comparing the first difference to a threshold; rinsing the surface with a third amount of water after determining that the first difference is greater than the threshold; collecting a portion of the third amount of water after rinsing the surface with the third amount of water; and measuring a third turbidity of the portion of the third amount of water after collecting the portion of the third amount of water.

18. The method of claim 17, further comprising: comparing the second turbidity and the third turbidity to determine a second difference; and comparing the second difference to the threshold.

19. A method of measuring rinse properties of a composition from a surface, the method comprising: applying a first treatment composition to a surface; rinsing the surface with a first amount of water after applying the first treatment composition to the surface; collecting a portion of the first amount of water after rinsing the surface with the first amount of water; measuring a first turbidity of the portion of the first amount of water after collecting the portion of the first amount of water; rinsing the surface with a second amount of water after measuring the first turbidity; collecting a portion of the second amount of water after rinsing the surface with the second amount of water; measuring a second turbidity of the portion of the second amount of water after collecting the portion of the second amount of water; comparing the first turbidity and the second turbidity to determine a first difference; comparing the first difference to a threshold; rinsing the surface with a third amount of water after determining that the first difference is greater than the threshold; collecting a portion of the third amount of water after rinsing the surface with the third amount of water; measuring a third turbidity of the portion of the third amount of water after collecting the portion of the third amount of water; comparing the second turbidity and the third turbidity to determine a second difference; comparing the second difference to the threshold; and determining a first rinse property of the first treatment composition after determining that the second difference is less than the threshold.

20. The method of claim 19, further comprising: applying a second treatment composition to the surface after determining the first rinse property; rinsing the surface with a fourth amount of water after applying the second treatment composition to the surface; collecting a portion of the fourth amount of water after rinsing the surface with the fourth amount of water; and measuring a fourth turbidity of the portion of the fourth amount of water after collecting the portion of the fourth amount of water.

21. The method of claim 20, further comprising: rinsing the surface with a fifth amount of water after measuring the fourth turbidity; collecting a portion of the fifth amount of water after rinsing the surface with the fifth amount of water; measuring a fifth turbidity of the portion of the fifth amount of water after collecting the portion of the fifth amount of water; comparing the fourth turbidity and the fifth turbidity to determine a third difference; comparing the third difference to the threshold; and rinsing the surface with a sixth amount of water after determining that the third difference is greater than the threshold.

22. The method of claim 21, further comprising: collecting a portion of the sixth amount of water after rinsing the surface with the sixth amount of water; measuring a sixth turbidity of the portion of the sixth amount of water after collecting the portion of the sixth amount of water; comparing the fifth turbidity and the sixth turbidity to determine a fourth difference; comparing the fourth difference to the threshold; and determining a second rinse property of the second treatment composition after determining that the fourth difference is less than the threshold.

23. The method of claim 22, further comprising determining a relative rate of rinsing between the first treatment composition and the second treatment composition.

24. The method of claim 22, further comprising performing a modification to the surface after determining the first rinse property and before applying the second treatment composition to the surface.

25. The method of claim 22, wherein: the first treatment composition is a shampoo or a conditioner; and the second treatment composition is a shampoo or a conditioner.

26. The method of claim 22, further comprising applying a pre-wash solution to the surface before applying the first treatment composition to the surface, the pre-wash solution configured to remove contaminants from the surface.

27. The method of claim 22, further comprising: waiting a first time period after measuring the first turbidity and before rinsing the surface with the second amount of water, the first time period being between 4 seconds and 120 seconds, inclusive; and waiting a second time period after determining the first rinse property and before applying the second treatment composition, the second time period being between 4 seconds and 120 seconds, inclusive.

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:—

[0086] 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

[0087] The conditioners A-D were prepared using the following methods: [0088] 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. [0089] 2. Cetearyl alcohol was then added to the formulation along with tertiary amine salt (if present) [0090] 3. At 80° C. the Behenyltrimmonium Chloride was added (if present) and the resultant mixture mixed. [0091] 4. The heat was then turned off and quench water added. [0092] 5. The mixture was then cooled to below 40° C. and the rest of the materials were added. [0093] 6. Finally, the formulation was mixed at high shear on a Silverson mixer at 5000 rpm for 5 minutes.

Example 2: Measurement of Turbidity of the Rinse Water from Hair Following Treatment with Compositions A-D

[0094] The hair used in the following examples was dark brown European hair in 5 g 10″ switches.

[0095] 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. Excess water was removed by running the switch between finger and thumb under light pressure

[0096] 2. 2.5 g of conditioner A, B, C or D was applied onto the switch and spread evenly across the surface of the switch.

[0097] 3. The switch was fastened onto a clamp by metal clip and a container positioned below the switch.

[0098] 4. Water was applied to the switch (at a flow rate of approx. 1 L/min) and collected in the container. Water was applied to the switch for the following timepoints (10/20/25/30/35 and 40 seconds), with the water running off the switch during each timepoint being collected in a separate glass jar. Stopwatch and water flow were stopped at each timepoint to allow collection of water and placement of new container beneath the switch.

[0099] Three replicates were carried out for each formulation (using a new hair switch for each replicate).

[0100] The turbidity of the collected rinse water samples was measured using a Turbiscan TLab Expert, at 25° C. The values from the Turbiscan were captured as ΔT, relative to clear water.

[0101] The results are given in Table 3 below.

TABLE-US-00003 TABLE 3 Turbidity /ΔT (mean of 3 replicates) of rinse water from hair treated with compositions A-D Rinse A C D B time (s) Mean SD Mean SD Mean SD Mean SD 5 79.67 4.51 79.00 3.61 39.67 30.66 39.67 20.11 10 64.67 15.01 41.33 10.07 30.67 19.14 32.00 13.08 15 43.00 9.85 17.67 15.04 48.00 12.12 37.67 21.08 20 28.33 16.44 14.33 6.03 19.33 11.37 47.33 13.32 25 12.67 3.06 13.00 10.44 17.00 17.32 35.33 19.86 30 8.33 4.73 8.00 2.00 8.33 10.12 23.33 4.16 35 10.00 10.15 7.00 6.08 5.33 5.86 15.33 10.12 40 6.67 3.21 5.00 1.00 9.00 13.86 8.67 5.51 45 7.00 7.21 1.67 1.53 — — 12.33 11.37 50 — — — — — — 6.33 4.51

[0102] In conclusion the method of the invention enables rinse properties to be measured accurately for different compositions.