This sunscreen lotion formulation was designed to provide broad spectrum (SPF/PFA <3) label SPF 20 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 ~ 25, PFA (PPD) ~ 8 performance with critical wavelength 378 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] | 10.00 | UV Filter / Sunscreen Agent | ||
| B | Benzophenone-3 [Oxybenzone] | 3.00 | UV Filter / Sunscreen Agent | |
| Butyl Methoxydibenzoylmethane [Avobenzone] | 2.50 | 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 | 1.60 | Emulsifier | |
| PEG-100 Stearate | HALLSTAR® PEG 4400 MS | 1.40 | Emulsifier | |
| Potassium Cetyl Phosphate, Hydrogenated Palm Glycerides | 2.10 | Emulsifier | ||
| D | Water (Aqua) (deionized) | up to 100 | Volatile Carrier | |
| Disodium EDTA | 0.05 | Chelating Agent | ||
| Xanthan Gum (pharma grade) | 0.25 | 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 ingredients individually in Phase A with continued mixing. |
| 2 | Heat phase AB to 85°C and then add phase C ingredients, in order, with mixing. |
| 3 | Add water of phase D to the main vessel, dissolve Disodium EDTA and, with continued mixing, add Xanthan Gum. |
| 4 | When Xanthan Gum is fully incorporated, start heating this 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 lotion |
| Viscosity (Brk, RVDV-II, T-D, 20 rpm, after 24 h at room temperature; mPa·s) | 3000 - 6000 |
| pH | 5.5 - 6.5 |
*Patented and Patent Pending
The information presented herein is believed to be accurate and reliable, but no warranty or guarantee, expressed or implied, is made regarding the information or the performance of any product. Further, nothing contained herein shall be taken as any inducement or recommendation to use, manufacture or sell that may infringe any patents or any other proprietary rights now or hereafter in existence, nor to imply compliance with any regulatory requirements
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