This formulation was designed to provide superb broad spectrum (SPF/PFA <<3), UVA/UVB 5 stars, label SPF 30 performance. SolaStay® S1 provides very rapid and efficient excited state quenching of Avobenzone, protecting it from photodegradation, and also mitigates the photocatalytic and reactive oxygen species generating activities of Titanium Dioxide to improve sunscreen performance. HallBrite® BHB contributes to UV filter solubility and enhanced product feel. This formulation was subjected to in vitro analysis and delivered SPF ~32 , PFA (PPD) ~18 performance with critical wavelength 380 nm (UVA/UVB 0.91 – 0.86).
| Phase | INCI Name [INN/USAN] (Other Information) | Trade Name | % Wt | Function |
|---|---|---|---|---|
| A | Ethylhexyl Methoxycrylene | SolaStay® S1* | 2.00 | Photostabilizer |
| Butyloctyl Salicylate | HALLBRITE® BHB* | 6.00 | Sunscreen Solvent / Emollient | |
| Ethylhexyl Salicylate [Octisalate] | 5.00 | UV Filter / Sunscreen Agent | ||
| B | Titanium Dioxide [Titanium Dioxide], Aluminum Hydroxide (60 nm primary particle size) | 3.00 | UV Filter / Sunscreen Agent | |
| C | Cetearyl Alcohol | HALLSTAR® TA-1618 CETEARYL ALCOHOL | 1.00 | Emulsion Stabilizer |
| VP/Eicosene Copolymer | 1.50 | Film Former | ||
| Glyceryl Stearate | HALLSTAR® GMS PURE | 0.80 | Emulsifier | |
| PEG-100 Stearate | HALLSTAR® PEG 4400 MS | 0.75 | Emulsifier | |
| Potassium Cetyl Phosphate, Hydrogenated Palm Glycerides | 1.60 | null | ||
| D | Butyl Methoxydibenzoylmethane [Avobenzone] | 2.50 | UV Filter / Sunscreen Agent | |
| E | Water (Aqua) (deionized) | up to 100 | Volatile Carrier | |
| Disodium EDTA | 0.05 | Chelating Agent | ||
| Xanthan Gum (pharma grade) | 0.30 | Thickener (Aqueous) | ||
| F | Preservative | a.n. | Preservative | |
| Glycerin | 3.00 | Humectant | ||
| G | Acrylamide/Sodium Acryloyldimethyltaurate Copolymer, Isohexadecane, Polysorbate 80 | 1.00 | Thickener (Aqueous) / Emulsion Stabilizer |
| 1 | In secondary vessel combine phase A and start mixing. Slowly add phase B with continued mixing. |
| 2 | Heat this phase AB to 85°C and add phase C items in order while mixing. Then add phase D and mix until dissolved. |
| 3 | Add water of phase E to main vessel and with continued mixing add Disodium EDTA and when dissolved add Xanthan Gum. |
| 4 | When phase E items are fully incorporated, start heating phase E to 80°C and add premixed phase F with mixing. |
| 5 | When both phases are homogeneous and at their designated temperatures, slowly add phase ABCD to phase EF with prop mixing. |
| 6 | Homogenize combined phases for 3 minutes, resume prop mixing, start cooling and add phase G when batch is below 50°C. |
| 7 | Continue mixing and cooling until batch is at room temperature, replace any water lost to evaporation , and mix until smooth. |
| Appearance | Off-white lotion |
| Viscosity (Brk, RVDV-II, T-D, 20 rpm, after 24 h at room temperature; mPa·s) | 6000 - 10500 |
| pH | 6.0 - 7.0 |
*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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