This sunscreen lotion spray formulation was designed to provide broad spectrum (SPF/PFA <3) label SPF 40 performance. SolaStay® S1 provides very rapid and efficient excited state quenching of Avobenzone, protecting it from photodegradation. HallBrite® BHB contributes to UV filter solubility and enhances product feel. This formulation was subjected to in vitro analysis and delivered SPF ~40 , PFA (PPD) ~18 performance with critical wavelength 379 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 | ||
| C12-15 Alkyl Benzoate | 10.00 | Sunscreen Solvent | ||
| Butyloctyl Salicylate | HALLBRITE® BHB* | 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) | 2.00 | 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 | Preservative | a.n. | Preservative | |
| Glycerin | 4.00 | Humectant | ||
| G | Water (Aqua) (deionized) | 12.00 | Volatile Carrier | |
| Phenylbenzimidazole Sulfonic Acid [Ensulizole] | 2.00 | UV Filter / Sunscreen Agent | ||
| Sodium Hydroxide (10% aqueous) | 2.90 | pH Adjuster | ||
| H | Water (Aqua) (deionized) | 9.60 | Volatile Carrier | |
| Microcrystalline Cellulose, Cellulose Gum | 0.40 | Thickener (Aqueous) |
| 1 | Add phase A to the secondary vessel, start mixing, add phase B, start heating phase AB to 70°C and add phase C ingredients, in order, with mixing. |
| 2 | Disperse phase D in phase ABC and mix well before later combining oil and water phases. |
| 3 | Add water of phase E to main vessel, dissolve Disodium EDTA and, with continued mixing, add Xanthan Gum. |
| 4 | When Xanthan Gum is fully incorporated start heating phase E to 70°C, add preblended phase F and then add phase G solution at pH 7.5 - 8.0. |
| 5 | When both phases are homogeneous and at their designated temperatures, add oil phase ABCD to water phase EFG with prop mixing. |
| 6 | After mixing combined phases for five minutes, start cooling and homogenize until the batch cools to 55°C. |
| 7 | Resume prop mixing with sweep mixing and continue cooling. |
| 8 | When batch is 50°C or lower, very slowly add previously prepared phase H (so it is a fully hydrated solution) and continue mixing for 20 minutes. |
| 9 | Replace any water lost to evaporation, mix batch until smooth and perform quality assurance checks. |
| Appearance | Off-white to pale yellow fluid liquid lotion |
| Viscosity (Brk, RVDV-II, Sp 4, 20 rpm, after 24 h at room temperature; mPa·s) | 750 - 1250 |
| pH | 7.0 - 8.0 |
*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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