Process for manufacturing an emulsion

Abstract

Present invention relates to a process for manufacturing emulsion composition which comprises an oil phase dispersed in a continuous water phase which is stabilized with a surfactant as an emulsifier. The present invention is on a method for producing an emulsion comprising one or more fatty alcohol, one or more oil liquid at 20 C. and one or more surfactant wherein one or more surfactant is added to the dispersion of one or more fatty alcohol and one or more oil liquid at 20 C. in water at a temperature of 50 C. or higher, preferably 60 C. or higher with the condition that the temperature of the dispersion is at least 10 C. higher than the melting point of fatty alcohol having the highest melting point, more preferably between 60 and 85 C. wherein the emulsion thus obtained does not comprise dispersed droplets with a volume size larger than or equal to 10 m measured directly without dilution of the emulsion at 20 C. measured with a laser particle size analyzer suitable therefore.

Claims

1. A method of producing an emulsion composition, said composition comprising one or more fatty alcohol, one or more oil which is liquid at 20 C., and one or more surfactant, said method comprising: adding one or more surfactant to a dispersion of the one or more fatty alcohol and the one or more oil liquid at 20 C. in water at a temperature of 50 C. or higher, with the condition that the temperature of the dispersion is at least 10 C. higher than melting point of the one or more fatty alcohol, thus forming an emulsion, wherein the emulsion does not comprise dispersed droplets with a volume size of larger than or equal to 10 m measured directly without dilution of the emulsion at 20 C., and measured with a laser particle size analyzer suitable therefore.

2. The method according to claim 1, wherein the one or more fatty alcohol is selected from fatty alcohols of the general structure
R.sub.1OH wherein R.sub.1 is a saturated or unsaturated, straight or branched alkyl chain having 12 to 30 C atoms which may also be substituted with one or more OH groups.

3. The method according to claim 1, wherein the one or more oil is selected from synthetic oil and natural oil.

4. The method according to claim 1, wherein weight ratio of the one or more fatty alcohol to the one or more oil is less than or equal to 1.

5. The method according to claim 1, wherein the emulsion comprises mineral oil which is liquid at 20 C.

6. The method according to claim 1, wherein the one or more surfactant is selected from anionic, nonionic and cationic surfactant.

7. The method according to claim 1, wherein the one or more surfactant is anionic.

8. The method according to claim 1, wherein the one or more surfactant is selected from cationic surfactants according to general structure ##STR00005## where R.sub.8 is a saturated or unsaturated, branched or non-branched alkyl chain with 8-22 C atoms, or
R.sub.12CO NH(CH.sub.2).sub.n where R.sub.12 is saturated or unsaturated, branched or non-branched alkyl chain with 7-21 C atoms and n has typical value of 1-4, or
R.sub.13CO O(CH.sub.2).sub.n where R.sub.13 is saturated or unsaturated, branched or non-branched alkyl chain with 7-21 C atoms and n has typical value of 1-4, and and R.sub.9, R.sub.10 and R.sub.11 are independent from each other H or lower alkyl chain with 1 to 4 carbon atoms, and X is an anion.

9. The method according to claim 1, wherein weight ratio of the one or more surfactant to total of the one or more fatty alcohol and the one or more oil is less than or equal to 0.25.

10. The method according to claim 1, wherein the emulsion comprises at least one oxidizing agent.

11. The method according to claim 1, wherein the emulsion comprises one or more of the compounds selected from a-Cationic polymer, b-Organic solvent, c-Ceramide, d-Phytosterol, e-Diamide compound according to general structure ##STR00006## wherein R.sub.14 is a linear or branched, saturated or unsaturated alkyl chain with 1 to 12 C atoms which may be substituted with hydroxy and/or alkoxy groups, R.sub.15 is linear or branched alkyl chain with 1 to 5 C atoms, and R.sub.16 linear or branched, saturated or unsaturated alkyl chain with 1 to 22 C atoms, and f-Ubiqinone according to general structure ##STR00007## where n is a number between 1 and 10.

12. A process for treating hair, comprising: (a) mixing the composition manufactured according to the method of claim 1 with a second composition, and (b) applying onto hair a mixture obtained from step (a), and (c) leaving the mixture obtained from step (a) on hair for a period 1 to 45 min, and (d) rinsing the mixture obtained from step (a) off from hair.

13. The process according to claim 12, wherein the second composition comprises at least one hair dye.

14. A kit comprising two or more compositions, wherein one of the two or more compositions is an emulsion manufactured in accordance with the method of claim 1.

15. The method according to claim 1, wherein the temperature of the dispersion is 60 C. or higher.

16. The method according to claim 2, wherein the one or more fatty alcohol is present at a concentration in the range of 1 to 20% by weight calculated to the total of the composition.

17. The method according to claim 2, wherein the one or more fatty alcohol is solid at 20 C.

18. The method according to claim 3, wherein the one or more oil is present at a concentration in the range of 1 to 20% by weight calculated to the total of the composition.

19. The method according to claim 6, wherein the one or more surfactant is present at a total concentration of 0.05 to 10% by weight calculated to the total of the composition.

20. The method according to claim 7, wherein the one or more surfactant is sodium lauryl sulfate.

Description

EXAMPLE 1

Oxidizing Emulsion Composition

(1) TABLE-US-00001 % by weight Cetearyl alcohol 2.0 Mineral oil 2.5 Sodium lauryl sulphate 0.2 Glycerin 0.9 Hydrogen peroxide 9.0 Salicylic acid 0.05 Etidronic acid 0.2 Phosphoric acid/sodium phosphate 0.3 Water to 100

(2) The above composition was produced in accordance with the claim 1 of the present specification. Namely, 40% of water, cetyl alcohol, mineral oil, glycerin, phosphoric acid and salicylic acid were mixed in a vessel at approximately 70 C. and after melting and dispersing the oil phase in water, sodium lauryl sulphate was added directly into the vessel and the composition was mixed until all surfactant was dissolved in the mixture. Afterwards, additional 40% of the water was added to the composition and therewith cooling of the batch was achieved. Under continuous mixing hydrogen peroxide was added and the remaining water was mixed to the composition. pH of the composition was measured at ambient temperature to be 2.1.

(3) Volume size distribution of the emulsion thus obtained was analyzed using Sequip laser in situ particle size analyzer suitable for analysis particle in the range of 0.5 and 200 m. The equipment is commercially available under the brand Sequip from Sequip S&E GmbH in Dsseldorf-Germany. It was found that the emulsion comprises only droplets smaller than 5 m and has a very narrow size distribution range.

(4) For comparative purposes, the above composition was produced according to the conventional method wherein all components including the surfactants were mixed at around 70 C. and the batch cooled down to ambient temperature. The pH of the composition was measured to be 2.1. It was observed that the composition had only turbid appearance and droplet size analysis showed that all droplets are larger than 20 m.

(5) The following examples are within the scope of the claims of the present invention.

EXAMPLE 2

Oxidizing Emulsion Composition

(6) TABLE-US-00002 % by weight Cetearyl alcohol 2.0 Almond oil 2.5 Cetrimonium Chloride 0.2 Glycerin 0.9 Hydrogen peroxide 9.0 Salicylic acid 0.05 Etidronic acid 0.2 Phosphoric acid/sodium phosphate 0.3 Water to 100 pH of the composition was measured at ambient temperature to be 2.1.

EXAMPLE 3

Oxidizing Emulsion Composition

(7) TABLE-US-00003 % by weight Myristyl Alcohol 2.0 Mineral oil 2.5 Ceteareth-30 1.0 Glycerin 0.9 Hydrogen peroxide 9.0 Salicylic acid 0.05 Etidronic acid 0.2 Phosphoric acid/sodium phosphate 0.3 Water to 100 pH of the composition was measured at ambient temperature to be 2.1.

EXAMPLE 4

Oxidizing Emulsion Composition

(8) TABLE-US-00004 % by weight Behenyl Alcohol 2.0 Cetyl Palmitate 2.5 Sodium lauroyl glutamate 1.0 Glycerin 0.9 Hydrogen peroxide 9.0 Salicylic acid 0.05 Etidronic acid 0.2 Phosphoric acid/sodium phosphate 0.3 Water to 100 pH of the composition was measured at ambient temperature to be 2.1.

EXAMPLE 5

Emulsion Composition

(9) TABLE-US-00005 % by weight Cetearyl alcohol 2.0 Mineral oil 2.5 Sodium lauryl sulphate 0.2 Glycerin 0.9 Salicylic acid 0.05 Phosphoric acid/sodium phosphate 0.2 Water to 100 pH of the composition was measured at ambient temperature to be 6.5.