Oil-in-water emulsion

1. An oil-in-water emulsion comprising:

(a) a siloxane mixture, comprising (a1) a silicone compound having a dynamic viscosity at 25° C. of from 30,000 to 1,200,000 mPa·s and (a2) an amino-functional silicone having an amine number of from 1 to 50 mgKOH/g;

(b) natural oil;

(c) emulsifier; and

(d) water;

wherein ingredient (a1) is of the following formula:

R 1 R 2 2 SiO(R 2 2 SiO) m SiR 2 2 R 1

wherein R 2 is, identically or differently on each occurrence, a monovalent hydrocarbon group having from 1 to 18 carbon atoms;

wherein R 1 is, identically or differently on each occurrence, R 2 , hydroxyl group or a C 1 -C 6 alkoxy group;

wherein the mass ratio of ingredient (b) to ingredient (a1) is 5:(4-32); and

wherein the mass ratio of ingredient (b) to ingredient (a2) is 5:(1-8).

2. The oil-in-water emulsion of claim 1 , wherein the mass ratio of ingredient (b) to ingredient (a) is 1:(1-8).

3. The oil-in-water emulsion of claim 2 , wherein the mass ratio of ingredient (b) to ingredient (a) is 1:(2-8).

4. The oil-in-water emulsion of any one of claim 1 , wherein the ingredient (b) is present in an amount of from 5 to 25 wt % based on the total weight of the emulsion.

5. The oil-in-water emulsion of any one of claim 1 , wherein the ingredient (a) is present in an amount of from 20 to 60 wt % based on the total weight of the emulsion.

6. The oil-in-water emulsion of any one of claim 1 , wherein the ingredients (b) and (a) are present in a total amount of from 40 to 70 wt % based on the total weight of the emulsion.

7. The oil-in-water emulsion of any one of claim 1 , wherein the ingredient (b) is an oil derived from vegetables, seeds or nuts.

8. The oil-in-water emulsion of any one of claim 1 , wherein the ingredient (c) comprises one polyoxyethylene alkyl ether or ester having an HLB value of from 5 to 10 and two polyoxyethylene alkyl ethers or esters having an HLB value of from 10 to 20.

9. The oil-in-water emulsion of claim 8 , wherein the ingredient (c) has an HLB value of from 12 to 16.

10. The oil-in-water emulsion of claim 8 , wherein the ingredient (c) is present in an amount of less than 15 wt % based on the total weight of the silicone mixture and natural oil.

11. The oil-in-water emulsion of any one of claim 1 , wherein the ingredient (a1) has a dynamic viscosity at 25° C. of from 40,000 to 100,000 mPa·s.

12. The oil-in-water emulsion of any one of claim 1 , wherein the ingredient (a2) has an amine number of from 5 to 10 mgKOH/g.

13. A method for preparing the oil-in-water emulsion, comprising:

providing an oil-in-water emulsion comprising (a) a siloxane mixture, comprising (a1) a silicone compound having a dynamic viscosity at 25° C. of from 30,000 to 1,200,000 mPa·s and (a2) an amino-functional silicone having an amine number of from 1 to 50 mgKOH/g, (b) natural oil, (c) emulsifier, and (d) water, wherein ingredient (a1) is of the formula: R 1 R 2 2 SiO(R 22 SiO) m SiR 2 2 R 1 , wherein where R 2 is, identically or differently on each occurrence, a monovalent hydrocarbon group having from 1 to 18 carbon atoms, wherein R 1 is, identically or differently on each occurrence, R 2 , hydroxyl group or a C 1 -C 6 alkoxy group; and

wherein the mass ratio of ingredient (b) to ingredient (a1) is 5:(4-32);

wherein the mass ratio of ingredient (b) to ingredient (a2) is 5:(1-8); and

wherein the oil-in-water emulsion has a particle size of less than 500 nm.

14. The method for preparing an oil-in-water emulsion of claim 13 , further comprising the following steps of:

1) Mixing the siloxane mixture with the natural oil to obtain a mixed oil;

2) Mixing the emulsifier and the mixed oil to obtain a paste; and

3) adding water to the paste and homogenizing to obtain the product.

15. The method for preparing an oil-in-water emulsion of claim 13 , wherein the oil-in-water emulsion is used in personal care products.

16. The method for preparing an oil-in-water emulsion of claim 15 , wherein the personal care products are rinse-off hair care products.

17. The oil-in-water emulsion of claim 1 , wherein the oil-in-water emulsion is used in personal care products.

18. The oil-in-water emulsion of claim 17 , wherein the personal care products are rinse-off hair care products.