Pigment dispersion and related method of manufacture

A method of producing an oil-in-water emulsion comprising:

• dispersing an inorganic pigment in a water immiscible solvent;
• preparing an aqueous phase including water, the aqueous phase separate from said inorganic pigment and said water immiscible solvent;
• combining said water immiscible solvent including the inorganic pigment with the aqueous phase to form an oil-in-water emulsion;
• and
• agitating the oil-in-water emulsion for a time sufficient to partition the inorganic pigment into the aqueous phase but prevent the inorganic pigment from agglomerating,
• wherein the aqueous phase includes an emulsifier selected from the group consisting of sodium stearate, potassium stearate, titanium stearate, zinc stearate and magnesium stearate.

A method of producing an oil-in-water emulsion comprising:

• dispersing an inorganic pigment in a water immiscible solvent;
• preparing an aqueous phase including water, the aqueous phase separate from said inorganic pigment and said water immiscible solvent;
• combining said water immiscible solvent including the inorganic pigment with the aqueous phase to form an oil-in-water emulsion;
• agitating the oil-in-water emulsion for a time sufficient to partition the inorganic pigment into the aqueous phase but prevent the inorganic pigment from agglomerating;
• wherein the aqueous phase include an emulsifier having a HLB value of about 14 to about 20;
• and
• wherein the aqueous phase is heated to about 54° C. to about 63° C.

A method of producing an oil-in-water emulsion comprising:

• dispersing an inorganic pigment in a water immiscible solvent;
• preparing an aqueous phase including water, the aqueous phase separate from said inorganic pigment and said water immiscible solvent;
• combining said water immiscible solvent including the inorganic pigment with the aqueous phase to form an oil-in-water emulsion;
• agitating the oil-in-water emulsion for a time sufficient to partition the inorganic pigment into the aqueous phase but prevent the inorganic pigment from agglomerating;
• and
• cooling said oil-in-water emulsion in multiple stages wherein each stage has a different rate of cooling.

A method of forming a cosmetic foundation comprising:

• preparing an oil dispersion including an oil and a pigment;
• preparing a separate aqueous phase including an emulsifier, a humectant and a plasticizer, the emulsifier being at least one of sodium stearate, potassium stearate, titanium stearate, zinc stearate and magnesium stearate having an HLB value of about 14 to about 20;
• adding the oil dispersion to the aqueous phase to form a mixture;
• partitioning the pigment so that the pigment uniformly disperses in the mixture;
• and
• cooling the mixture at a rate sufficient to prevent agglomeration of the pigment in the mixture.

A method of forming a cosmetic foundation comprising:

• preparing an oil dispersion including an oil and a pigment;
• preparing a separate aqueous phase including an emulsifier, a humectant and a plasticizer;
• adding the oil dispersion to the aqueous phase to form an oil-in-water emulsion mixture;
• partitioning the pigment so that the pigment uniformly disperses in the mixture;
• and
• cooling the mixture at a rate sufficient to prevent agglomeration of the pigment in the mixture,
• wherein the emulsifier is a metal salt of stearic acid.

A method of forming a cosmetic foundation comprising:

• preparing an oil dispersion including an oil and a pigment;
• preparing a separate aqueous phase including an emulsifier, a humectant and a plasticizer;
• adding the oil dispersion to the aqueous phase to form an oil-in-water emulsion mixture;
• partitioning the pigment so that the pigment uniformly disperses in the mixture;
• cooling the mixture at a rate sufficient to prevent agglomeration of the pigment in the mixture;
• and
• heating the aqueous phase to a temperature from about 35° C. to about 63° C.

A method of forming a cosmetic foundation comprising:

• preparing an oil dispersion including an oil and a pigment;
• preparing a separate aqueous phase including an emulsifier, a humectant and a plasticizer;
• adding the oil dispersion to the aqueous phase to form an oil-in-water emulsion mixture;
• partitioning the pigment so that the pigment uniformly disperses in the mixture;
• and
• cooling the mixture at a rate sufficient to prevent agglomeration of the pigment in the mixture,
• wherein said partitioning comprises:
• heating the mixture from about 27° C. to about 63° C.;
• and
• agitating the mixture with a high-shear mixer.

A method of forming a cosmetic foundation comprising:

• preparing an oil dispersion including an oil and a pigment;
• preparing a separate aqueous phase including an emulsifier, a humectant and a plasticizer;
• adding the oil dispersion to the aqueous phase to form an oil-in-water emulsion mixture;
• partitioning the pigment so that the pigment uniformly disperses in the mixture;
• and
• cooling the mixture at a rate sufficient to prevent agglomeration of the pigment in the mixture,
• wherein said preparing an oil dispersion comprises:
• adding the pigment particles to an oil;
• agitating the oil;
• and
• milling the oil and pigment particles so that the major dimension of a majority of pigment particles is less than about 0.025 millimeters.

A method of forming a cosmetic foundation comprising:

• preparing an oil dispersion including an oil and a pigment;
• preparing a separate aqueous phase including a humectant, a plasticizer, and an emulsifier;
• adding the oil dispersion to the aqueous phase to form a mixture;
• and
• partitioning the pigment so that the pigment uniformly disperses in the aqueous phase, wherein the emulsifier is selected from the group consisting of sodium stearate, potassium stearate, titanium stearate, zinc stearate and magnesium stearate, wherein the emulsifier has an HLB value sufficient to prevent agglomeration of the pigment when the pigment is dispersed in the aqueous phase.