DEPOSITION SYSTEM FOR HAIR

Abstract

A hair treatment composition comprising: a) a conditioning base comprising: i) a cationic conditioning surfactant having from 16 to 32 carbon atoms; ii) a fatty alcohol having from 8 to 22 carbon atoms; and b) from 0.1 to 10 wt % of a microcapsule in which a core comprising benefit agent is encapsulated in a polymeric shell; and (c) from 0.1 to 5 wt % of a diesterquat, provides improved deposition of microcapsules and delivery of benefit agent to hair surfaces.

Claims

1. A hair treatment composition comprising: a) a conditioning base comprising: i) a cationic conditioning surfactant having from 16 to 32 carbon atoms; ii) a fatty alcohol having from 8 to 22 carbon atoms; b) from 0.1 to 10 wt % of a microcapsule in which a core comprising benefit agent is encapsulated in a polymeric shell; and (c) from 0.1 to 5 wt % of a diesterquat.

2. The composition of claim 1, wherein the diesterquat is defined by formula (I): ##STR00002## wherein, the radicals R.sub.1, R.sub.2 each independently of each other can be identical or different and are a branched or unbranched alkyl radical having 1 to 4 carbon atoms; R.sub.3 and R.sub.4 are represented by —X—O—CO—R.sub.5, wherein X is a branched or unbranched alkyl group having 1 to 4 carbon atoms; and R.sub.5 is selected from a saturated branched or unbranched, an unsaturated branched or unbranched, or a cyclic saturated or unsaturated alkyl radical, each having 6 to 30 carbon atoms and which may contain a hydroxyl group; and A− is a physiologically compatible organic or inorganic anion.

3. The composition of claim 2, wherein R.sub.5 is selected from a saturated or unsaturated branched alkyl radical.

4. The composition of claim 2, wherein X is selected from ethyl or isopropyl, R.sub.5 has chains selected from i) branched, saturated chains with a chain length of C18 or C16, or ii) unbranched, unsaturated or saturated chains, with a chain length of C18 or C16.

5. The composition of claim 2, wherein the radicals R.sub.1, R.sub.2 of the diesterquat are independently selected from the group consisting of methyl, ethyl, propyl, iso-propyl, butyl, tert-butyl and iso-butyl.

6. The composition of claim 2, wherein X is selected from the group consisting of methyl, ethyl, propyl, iso-propyl, butyl, tert-butyl and iso-butyl.

7. The composition of claim 2, wherein the diesterquat is selected from bis (isostealoyl/oleoyl isopropyl) diimonium methosulfate or dioleoylisopropyl diimonium methosulfate.

8. The composition of claim 1, wherein the diesterquat is present in an amount of from 0.5 to 1.2 wt % based on the total weight of the composition.

9. The composition of claim 1, wherein the microcapsule is an aminoplast resin selected from polyurea formed by reaction of polyisocyanates with material selected from polyamines, polyimines or mixtures thereof.

10. The composition of claim 9, wherein the microcapsule has a polyurea shell.

11. A method of treating hair comprising applying to the hair the composition of claim 1.

12. (canceled)

13. The composition of claim 2, wherein R.sub.5 is selected from a saturated branched or unbranched, an unsaturated branched or unbranched, or a cyclic saturated or unsaturated alkyl radical, each having 12 to 24 carbon atoms.

14. The composition of claim 2, wherein R.sub.5 is selected from a saturated branched or unbranched, an unsaturated branched or unbranched, or a cyclic saturated or unsaturated alkyl radical, each having 14 to 20 carbon atoms.

15. The composition of claim 5, wherein the radicals R.sub.1, R.sub.2 of the diesterquat are independently selected from the group consisting of methyl, ethyl, propyl, and iso-propyl.

16. The composition of claim 6, wherein X is selected from the group consisting of ethyl, propyl and isopropyl.

17. The composition of claim 6, wherein X is ethyl or isopropyl.

Description

EXAMPLES

[0105] The invention will now be illustrated by the following non-limiting Examples:

Example 1: Compositions for Treatment of Hair Prior to Microcapsule Deposition Analysis

[0106] Three hair conditioner formulations were used to treat hair. Composition A is a comparative composition, whilst 1 and 2 are in accordance with the invention. The compositions are given in Table 1.

TABLE-US-00001 TABLE 1 Compositions of Conditioners A, B, and C Active INCl Level A 1 2 Bis(Isotearoyl/Oleoyllsoproypl) 100 0 0.6 0 Dimonium Methosulfate (Varisoft EQ100) Distrearoylethyl Dimonium 65 0 0 1.23 Chloride (Varisoft EQ65) Behentrimonium Chloride 70 2.29 1.43 1.14 Cetearyl Alcohol 100 3.2 3.2 3.2 Dimethicone 600K and 70 3.57 3.57 3.57 Amodimethicone 2000 nm Encapsulated perfume (ex IFF), 100 0.91 0.91 0.91 with polyurea shell Preservatives 100 0.5 0.5 0.5 Water 100 To 100 To 100 To 100

[0107] Formulations were made by adding the cationic surfactants to the fatty alcohol and stirring at 85° C. Gradually this mixture was added to water, typically at 55° C., such that the mixture temperature was 60° C. This temperature was maintained for 30 minutes with stirring. The mixture was then cooled towards ambient by adding more water, and adding remaining ingredients, and using external cooling if required, and stirred.

Example 2: Treatment of Hair with Compositions A, 1, and 2 and Encap Deposition Measurements in Accordance with the Invention

[0108] The hair used was dark brown European hair, in switches of 0.25 g weight and 2 inch length.

[0109] The hair was treated with Compositions A, 1 and 2 as follows:—

[0110] Hair was first treated with a cleansing shampoo using the following method:—

[0111] The hair fibres were held under running water for 30 seconds, shampoo applied at a dose of 0.1 ml of shampoo per 1 g of hair and rubbed into the hair for 30 seconds. Excess lather was removed by holding under running water for 30 seconds and the shampoo stage repeated. The hair was rinsed under running water for 30 seconds.

[0112] The wet hair was then treated with Conditioner A or B or C using the following method:—Conditioner was applied to the wet hair at a dose of 0.2 g of conditioner per 1 g of hair and massaged into the hair for 1 minute. The hair was rinsed under running water for 1 minute and excess water removed. Hair was dried overnight at room temperature.

[0113] 5 replicates hair switches were prepared for each conditioner. Each hair switch was cut into a vial, weighed and the required amount of solvent added and extracted for 1 hour. Each extract was pipetted into a 96-well micro litre plate for fluorescence spectrometry analysis along with a set of calibration standards with deposition efficiency range from 100% to 3%.

[0114] Microcapsule deposition efficiency measured on hair switches treated with Conditioners A, 1 and 2 are shown in Table 2.

TABLE-US-00002 TABLE 2 Microcapsule deposition efficiency on hair switches treated with Conditioners A, 1 and 2. Microcapsule Standard Example deposition (%) deviation/significance A 18.0 1.7 1 24.3 1.0 2 20.7 1.5

[0115] It will be seen that hair treated with Conditioners 1 and 2, in accordance with the invention, deposit higher levels of encapsulated benefit agent onto hair than comparative example A.