This sunscreen spray lotion formulation was designed to provide superior 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) ~20 performance with critical wavelength 380 nm.
| Phase | INCI Name [INN/USAN] (Other Information) | Trade Name | % Wt | Function |
|---|---|---|---|---|
| A | Ethylhexyl Methoxycrylene | SolaStay® S1* | 4.00 | Photostabilizer |
| Ethylhexyl Salicylate [Octisalate] | 5.00 | UV Filter / Sunscreen Agent | ||
| C12-15 Alkyl Benzoate | 10.00 | Solvent | ||
| Butyloctyl Salicylate | HALLBRITE® BHB* | 7.00 | Sunscreen Solvent / Emollient | |
| B | Butyl Methoxydibenzoylmethane [Avobenzone] | 5.00 | 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 | Water (Aqua) (deionized) | up to 100 | Volatile Carrier | |
| Disodium EDTA | 0.05 | Chelating Agent | ||
| Xanthan Gum (pharma grade) | 0.20 | Thickener (Aqueous) | ||
| E | Preservative | a.n. | Preservative | |
| Glycerin | 4.00 | Humectant | ||
| F | 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 | ||
| G | 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, in order, phase C ingredients. |
| 2 | Add water of phase D into main vessel, dissolve Disodium EDTA and, with continued mixing, add Xanthan Gum. |
| 3 | When Xanthan Gum is fully incorporated start heating phase D to 70°C, add preblended phase E and then add phase F solution of pH 7.5-8.0. |
| 4 | When both phases are homogeneous and at their designated temperatures, add oil phase ABC to water phase DEF with prop mixing. |
| 5 | After mixing combined phases for 5 minutes, start cooling and homogenize until the batch reaches 55°C. |
| 6 | Resume prop and sweep mixing of batch with continued cooling. |
| 7 | When batch is 50°C or lower, very slowly add previously prepared phase G (so it is a fully hydrated solution) and continue mixing for 20 minutes. |
| 8 | Replace any water lost to evaporation, mix batch until smooth and 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) | 900 - 1500 |
| 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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