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. HallBrite® BHB and HallTress® DIBA contribute to UV filter solubility and enhance product feel. This formulation was subjected to in vitro analysis and delivered SPF ~33 , PFA (PPD) ~17 performance with critical wavelength 380 nm.
| Phase | INCI Name [INN/USAN] (Other Information) | Trade Name | % Wt | Function |
|---|---|---|---|---|
| A | Ethylhexyl Methoxycrylene | SolaStay® S1* | 3.00 | Photostabilizer |
| Ethylhexyl Salicylate [Octisalate] | 5.00 | UV Filter / Sunscreen Agent | ||
| Butyloctyl Salicylate | HALLBRITE® BHB* | 6.00 | Sunscreen Solvent / Emollient | |
| Diisobutyl Adipate | HALLTRESS® DIBA SPECIAL | 5.00 | Sunscreen Solvent / Emollient | |
| B | Butyl Methoxydibenzoylmethane [Avobenzone] | 4.20 | UV Filter / Sunscreen Agent | |
| C | 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 | Styrene/Acrylates Copolymer (hollow spherical, 325 nm) | 3.00 | SPF Booster | |
| 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 A, heat to 70°C, and then add phase C ingredients to AB with continued mixing. Then, add phase D to ABC and mix until completely dispersed. |
| 2 | Add the water from phase E to main vessel, dissolve Disodium EDTA, then add Xanthan Gum and mix until fully incorporated. |
| 3 | Start phase E heating to 70°C and add premix of phase F to phase E. |
| 4 | With both phases are homogeneous and at temperature, add oil phase ABCD to water phase EF with mixing. |
| 5 | After mixing for five minutes, start cooling and homogenize until batch reaches 55°C (or for 3 minutes), then return to prop mixing with continued cooling. |
| 6 | At 50°C or lower, very slowly add premix of phase G and continue mixing for 20 minutes. |
| 7 | Replace any water lost to evaporation, and mix batch until smooth. Perform quality assurance checks. |
| Appearance | Pale yellow, fluid liquid lotion |
| Viscosity (Brk, RVDV-II, Sp 4, 20 rpm, after 24 h at room temperature; mPa·s) | 650 - 1200 |
| 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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