This sunscreen lotion formulation was designed to provide broad spectrum (SPF/PFA <3) SPF 15 performance. SolaStay® S1 and SolaStay® P1 provide very rapid and efficient excited state quenching of Avobenzone, protecting it from photodegradation and so improve sunscreen performance. HallBrite® BHB aids UV filter solubility and enhances product feel. This formulation was subjected to in vitro analysis and delivered SPF ~ 15, PFA(PPD) ~ 7 performance with critical wavelength 379 nm.
Phase | INCI Name [INN/USAN] (Other Information) | Trade Name | % Wt | Function |
---|---|---|---|---|
A | Ethylhexyl Methoxycrylene | SolaStay® S1* | 2.00 | Photostabilizer |
Polyester-25 | SolaStay® P1* | 4.00 | Photostabilizer | |
Ethylhexyl Salicylate [Octisalate] | 5.00 | UV Filter / Sunscreen Agent | ||
Butyloctyl Salicylate | HALLBRITE® BHB* | 5.00 | Sunscreen Solvent / Emollient | |
Homosalate [Homosalate] | 15.00 | UV Filter / Sunscreen Agent | ||
B | Butyl Methoxydibenzoylmethane [Avobenzone] | 3.00 | UV Filter / Sunscreen Agent | |
C | Cetearyl Alcohol | HALLSTAR® TA-1618 CETEARYL ALCOHOL | 0.50 | Emulsion Stabilizer |
VP/Eicosene Copolymer | 1.00 | Film Former | ||
Glyceryl Stearate | HALLSTAR® GMS PURE | 1.65 | Emulsifier | |
PEG-100 Stearate | HALLSTAR® PEG 4400 MS | 1.60 | Emulsifier | |
Potassium Cetyl Phosphate, Hydrogenated Palm Glycerides | 2.00 | Emulsifier | ||
D | Water (Aqua) (deionized) | up to 100 | Volatile Carrier | |
Disodium EDTA | 0.05 | Chelating Agent | ||
Xanthan Gum (pharma grade) | 0.30 | Thickener (Aqueous) | ||
E | Preservative | a.n. | Preservative | |
Glycerin | 3.00 | Humectant |
1 | To a secondary vessel add phase A and start mixing. Disperse phase B in phase A with continued mixing. |
2 | Heat phase AB to 85°C and then add, in order, phase C ingredients with mixing. |
3 | Add water of phase D to the main vessel, dissolve EDTA and, with contiuned mixing add Xanthan Gum. |
4 | When Xanthan Gum is fully incorporated start heating phase D to 80°C and add premixed phase E. |
5 | When both phases are homogeneous and at their designated temperatures, slowly add oil phase ABC to water phase DE with prop mixing. |
6 | Homogenize combined phases for 3 minutes and then resume prop mixing and start cooling batch. |
7 | When batch is at room temperature, replace any water lost to evaporation and mix until smooth. |
Appearance | Pale yellow thin lotion |
Viscosity (Brk, RVDV-II, T-D, 20 rpm, after 24 h at room temperature; mPa·s) | 1500 - 4500 |
pH | 5.5 - 6.5 |
*Patented and Patent Pending
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