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1. WO2010077705 - METHOD FOR PREPARING PERSONAL CARE COMPOSITION COMPRISING SURFACTANT AND HIGH MELTING POINT FATTY COMPOUND

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CLAIMS

What is claimed is:

1. A method of preparing a personal care composition, wherein the composition comprises: a cationic surfactant; a high melting point fatty compound; and an aqueous carrier, wherein the method comprises the steps:

(1) preparing an oil phase comprising the surfactant and the high melting point fatty compound, wherein the temperature of the oil phase is higher than a melting point of the high melting point fatty compound; and

(2) preparing an aqueous phase comprising the aqueous carrier, wherein the temperature of the aqueous phase is below the melting point of the high melting point fatty compounds; and

(3) mixing the oil phase and the aqueous phase to form an emulsion; wherein the mixing step (3) comprises the following detailed steps:

(3-1) feeding either of the oil phase or the aqueous phase into a high shear field having an energy density of about 1.OxIO2 J/m3 or more;

(3-2) feeding the other phase directly to the field; and

(3-3) forming an emulsion; wherein the mixing step (3) is conducted by using a homogenizer having a rotating member; wherein the cationic surfactant is mono-alkyl cationic surfactant and the composition is substantially free of di-alkyl cationic surfactants; and wherein the oil phase contains from 0 to about 50% of the aqueous carrier by weight of the oil phase.

2. The method of Claim 1, wherein the mixing step (3) comprises the following detailed steps: (3-1) feeding the aqueous phase into a high shear field having an energy density of about LOxIO2 J/m3 or more ;

(3-2) feeding the oil phase directly to the field; and (3-3) forming an emulsion.

3. The method of Claim 1, wherein the high shear field having an energy density of from about LOxIO3 J/m3.

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4. The method of Claim 1, the two phases reach to the high shear field within 0.52 seconds or less, after first meeting.

5. The method of Claim 1, wherein the homogenizer having a rotating member is a rotor-stator homogenizer.

6. The method of Claim 1, wherein the temperature of the emulsion is from about 2°C to about 600C lower than the melting point of the high melting point fatty compound.

7. The method of Claim 1, wherein the level of water in oil phase is up to about 40% by weight of the oil phase.

8. The method of Claim 1, wherein the level of water in oil phase is up to about 25% by weight of the oil phase.

9. The method of Claim 1, wherein the emulsion is a gel matrix comprising cationic surfactant, high melting point fatty compound, and aqueous carrier.

10. The method of Claim 9 wherein the weight ratio of the cationic surfactant and the high melting point fatty compound is within the range of from about 1:1 to about 1:4.

11. A composition made by the method of Claim 1.