This formulation was designed to provide broad spectrum (SPF/PFA <3) label SPF 30 performance. SolaStay® S1 provides very rapid and efficient excited state quenching of Avobenzone, protecting it from photodegradation. SolaStay® S1 also mitigates the photocatalytic and reactive oxygen species generating activities of the oxide to improve sunscreen performance. HallBrite® BHB contributes to UV filter solubility and enhances product feel. This formulation was subjected to in vitro analysis and delivered SPF ~35 (30), PFA (PPD) ~13 performance with critical wavelength 380 nm.
| Phase | INCI Name [INN/USAN] (Other Information) | Trade Name | % Wt | Function |
|---|---|---|---|---|
| A | Ethylhexyl Methoxycrylene | SolaStay® S1* | 2.20 | Photostabilizer |
| Ethylhexyl Salicylate [Octisalate] | 5.00 | UV Filter / Sunscreen Agent | ||
| Butyloctyl Salicylate | HALLBRITE® BHB* | 5.00 | Sunscreen Solvent / Emollient | |
| C12-15 Alkyl Benzoate | 5.00 | Sunscreen Solvent / Emollient | ||
| B | Titanium Dioxide [Titanium Dioxide], Aluminum Hydroxide (60 nm primary particle size) | 3.00 | UV Filter / Sunscreen Agent | |
| C | Ethylhexyl Triazone | 1.50 | UV Filter / Sunscreen Agent | |
| VP/Eicosene Copolymer | 1.00 | Film Former | ||
| Tri-C14-15 Alkyl Citrate | 1.50 | Consistency Modifier | ||
| Ceteareth-25, Disodium Ethylene Dicocamide PEG-15 Disulfate | 3.00 | Emulsifier | ||
| D | Butyl Methoxydibenzoylmethane [Avobenzone] | 2.20 | UV Filter / Sunscreen Agent | |
| E | Water (Aqua) (deionized) | up to 100 | Volatile Carrier | |
| Disodium EDTA | 0.05 | Chelating Agent | ||
| Xanthan Gum (pharma grade) | 0.20 | Thickener (Aqueous) | ||
| F | Glycerin | 4.00 | Humectant | |
| Preservative | a.n. | Preservative | ||
| G | Water (Aqua) (deionized) | 9.60 | Volatile Carrier | |
| Microcrystalline Cellulose, Cellulose Gum | 0.40 | Stabilizing Agent |
| 1 | To a secondary vessel add phase A, start mixing, add phase B to phase A, and heat phase AB to 70°C. |
| 2 | Add phase C ingredients to phase AB with continued mixing, then, add phase D to phase ABC and mix until completely dissolved. |
| 3 | Add the water from phase E to main vessel, dissolve Disodium EDTA, then add Xanthan Gum and mix until fully incorporated. |
| 4 | Start heating phase E to 70°C and add premix of phase F to phase E. |
| 5 | With both phases are homogeneous and at temperature, add oil phase ABCD to water phase EF with mixing. |
| 6 | After mixing for five minutes, start cooling and homogenize until batch reaches 55°C (or 3 minutes), then |
| 7 | At 50°C or lower, very slowly add premix of phase G and continue mixing for 20 minutes. |
| 8 | Replace any water lost to evaporation and mix batch until smooth. Perform quality assurance checks. |
| Appearance | Off-White, Fluid Liquid Lotion |
| Viscosity (Brk, RVDV-II, Sp 4, 20 rpm, after 24 h at room temperature; mPa·s) | 700 - 1300 |
| pH | 6.5 - 7.5 |
*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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