This formulation base utilizes Hallstar’s elegant sunscreen solvent and emollient HallBrite® BHB towards optimizing solvent polarity, to which the triplet state quenching photostabilizer HallBrite® PSF has been added, providing substantial additional photostabilization to the composition. In vivo testing (five subjects) indicates static SPF 34, while in vitro testing suggests PFA (PPD) ~12. Critical Wavelength = 379 nm.
| Phase | INCI Name [INN/USAN] (Other Information) | Trade Name | % Wt | Function |
|---|---|---|---|---|
| A | Homosalate [Homosalate] | 7.00 | UV Filter / Sunscreen Agent | |
| Butyloctyl Salicylate | HALLBRITE® BHB* | 5.00 | Sunscreen Solvent / Emollient | |
| C12-15 Alkyl Benzoate | 4.00 | Sunscreen Solvent / Emollient | ||
| Undecylcrylene Dimethicone | HALLBRITE® PSF* | 4.00 | Photostabilizer | |
| B | Butyl Methoxydibenzoylmethane [Avobenzone] | 3.00 | UV Filter / Sunscreen Agent | |
| C | Glyceryl Stearate | HALLSTAR® GMS PURE | 0.90 | Emulsifier |
| PEG-100 Stearate | HALLSTAR® PEG 4400 MS | 0.80 | Emulsifier | |
| Cetearyl Alcohol | HALLSTAR® TA-1618 CETEARYL ALCOHOL | 0.50 | Thickener (Nonaqueous) | |
| VP/Eicosene Copolymer | 1.00 | Film Former | ||
| Potassium Cetyl Phosphate, Hydrogenated Palm Glycerides | 2.20 | 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 | Humectant | ||
| F | Preservative | a.n. | Preservative | |
| Glycerin | 3.00 | Humectant | ||
| G | Acrylamide/Sodium Acryloyldimethyltaurate Copolymer, Isohexadecane, Polysorbate 80 | 1.50 | Thickener (Aqueous) | |
| Silica (spherical, 12 µm) | 2.00 | Feel Modification / Enhancement |
| 1 | In a secondary vessel, add phase A ingredients with mixing until homogenous, then add phase B to A and start heating to 85°C. |
| 2 | Then add phase C to AB, in order. Once phase ABC is at temperature and homogenous, add phase D to ABC and mix until well dispersed. |
| 3 | To the main vessel, add the water from phase E with mixing and dissolve Disodium EDTA, then add Xanthan, mixing until fully incorporated. |
| 4 | Start heating phase E to 80°C and then add premix phase F. |
| 5 | When both phases ABCD and EF are at temperature and homogenous, slowly add oil phase ABCD to water phase EF with prop mixing. |
| 6 | Homogenize and cool batch for 3 minutes and then return to prop mixing with continued cooling. Once batch is under 50°C, add phase G ingredients, with mixing until uniform. Replace any water lost and mix until smooth. Perform quality assuarnce checks. |
| Appearance | Off-White Cream |
| Viscosity (Brk, RVDV-II, T-D, 20 rpm, after 24 h at room temperature; mPa·s) | 11000 - 18000 |
| 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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