This formulation was designed to provide superior 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, and so improves sunscreen performance. HallBrite® BHB and HallTress® DIBA Special contribute to UV filter solubility and enhance product feel. This formulation was subjected to in vitro analysis and delivered SPF ~35 (30), PFA (PPD) ~16 performance with critical wavelength 379 nm.
| Phase | INCI Name [INN/USAN] (Other Information) | Trade Name | % Wt | Function |
|---|---|---|---|---|
| A | Ethylhexyl Methoxycrylene | SolaStay® S1* | 2.00 | Photostabilizer |
| Butyloctyl Salicylate | HALLBRITE® BHB* | 5.00 | Emollient / Sunscreen Solvent | |
| Diisobutyl Adipate | HALLTRESS® DIBA SPECIAL | 5.00 | Sunscreen Solvent | |
| B | Titanium Dioxide [Titanium Dioxide], Aluminum Hydroxide (60 nm primary particle size) | 2.00 | UV Filter / Sunscreen Agent | |
| C | Cetearyl Alcohol | HALLSTAR® TA-1618 CETEARYL ALCOHOL | 1.00 | Thickener (Nonaqueous) |
| VP/Eicosene Copolymer | 1.50 | Film Former | ||
| Glyceryl Stearate | HALLSTAR® GMS PURE | 0.90 | Emulsifier | |
| PEG-100 Stearate | HALLSTAR® PEG 4400 MS | 0.85 | Emulsifier | |
| Potassium Cetyl Phosphate, Hydrogenated Palm Glycerides | 1.50 | Emulsifier | ||
| D | Ethylhexyl Triazone | 1.20 | UV Filter / Sunscreen Agent | |
| Butyl Methoxydibenzoylmethane [Avobenzone] | 2.00 | UV Filter / Sunscreen Agent | ||
| E | Water (Aqua) (deionized) | up to 100 | Volatile Carrier | |
| Glycerin | 3.00 | Humectant | ||
| Disodium EDTA | 0.05 | Chelating Agent | ||
| Xanthan Gum (pharma grade) | 0.30 | Thickener (Aqueous) | ||
| F | Preservative | a.n. | Preservative | |
| Acrylamide/Sodium Acryloyldimethyltaurate Copolymer, Isohexadecane, Polysorbate 80 | 1.00 | Viscosity Increasing Agent (Aqueous) | ||
| Cyclopentasiloxane | 3.00 | Feel Modification / Enhancement | ||
| Aluminum Starch Octenylsuccinate | 1.50 | Deoiling Agent |
| 1 | To a secondary vessel add phase A, start mixing, slowly add phase B to phase A, heat to 85°C and then add phase C items in order. |
| 2 | When phase ABC is homogenous, add phase D items to it and continue mixing until dissolved. |
| 3 | Add Water and Glycerin from phase E to the main vessel, dissolve Disodium EDTA with continued mixing and then add Xanthan Gum. |
| 4 | Stir phase E until Xanthan Gum is fully incorporated and then start heating phase E to 80°C. |
| 5 | When both phase ABCD and phase E are homogeneous and at their designated temperatures, slowly add the oil phase ABCD to water phase E with prop mixing. After 2 minutes, homogenize for 3 minutes and then return to prop mixing. |
| 6 | Start cooling batch with continued mixing. When batch is < 50°C, add phase F items one by one to batch and continue mixing and cooling. |
| 7 | When batch is at room temperature, replace any water lost to evaporation, mix until smooth and perform quality assurance checks. |
| Appearance | Off-white to pale yellow fluid cream |
| Viscosity (Brk, RVDV-II, T-D, 20 rpm, after 24 h at room temperature; mPa∙s) | 4500 - 8000 |
| pH | 5.5 - 6.5 |
| Stability (45°C) | pass three months |
| Stability (three freeze-thaw cycles) | pass |
*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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