Method of making an anhydrous, pigmented composition
The invention relates to a method of making an anhydrous, pigmented sunscreen composition. The method comprises first adding a hydrophobic silica to a lipid phase comprising a dispersed color pigment and an organic UV-filter and homogenizing the mixture. Next, a hydrophilic silica is added and re-homogenization is performed.
1. A method of making an anhydrous, pigmented sunscreen composition, comprising in sequence:
adding a hydrophobic silica to a lipid phase comprising a dispersed color pigment and an organic UV-filter;
homogenizing the lipid phase comprising the hydrophobic silica by rotary mixing at a rotation speed of at least 1000 rpm;
adding a hydrophilic silica to the lipid phase comprising hydrophobic silica; and
re-homogenizing the lipid phase comprising the hydrophobic silica and the hydrophilic silica by rotary mixing at a rotation speed of at least 1000 rpm.
2. The method of claim 1 , wherein said homogenizing step is performed for at least one minute.
3. The method of claim 1 further comprising adding a silicone elastomer after said re-homogenizing step.
4. The method of claim 3 , wherein the amount of silicone elastomer added is 8% by weight of the composition.
5. The method of claim 1 , wherein said anhydrous, pigmented sunscreen composition comprises about 40% to about 75% by weight of oil.
6. The method of claim 3 , wherein the anhydrous, pigmented sunscreen composition comprises about 1% by weight of waxes.