This formula provides broad-spectrum sun protection by using high polarity sunscreen solvents and HallBrite@ PSF, a novel triplet state quenching organomodified silicone polymer, to enhance the photostability of Avobenzone. HallBrite@ PSF also improves the feel and spreadability of formulations, provides detackifications and anti-whitening benefits, and enhances substantivity and water resistance. This composition was subjected to in vitro analysis and delivered SPF ~17, PFA (PPD) ~9 performance with critical wavelength 376 nm.
| Phase | INCI Name [INN/USAN] (Other Information) | Trade Name | % Wt | Function |
|---|---|---|---|---|
| A | Water (Aqua) (deionized) | up to 100 | Volatile Carrier | |
| Disodium EDTA | 0.10 | Chelating Agent | ||
| Xanthan Gum (pharma grade) | 0.20 | Thickener (Aqueous) | ||
| Glycerin | 2.00 | Humectant | ||
| Butylene Glycol | 2.00 | Humectant | ||
| B | Dimethyl Capramide | SPECTRASOLV® DMDA* | 1.00 | Sunscreen Solvent |
| Homosalate [Homosalate] | 7.50 | UV Filter / Sunscreen Agent | ||
| Ethylhexyl Salicylate [Octisalate] | 5.00 | UV Filter / Sunscreen Agent | ||
| Octocrylene [Octocrilene] | 1.80 | UV Filter / Sunscreen Agent | ||
| Undecylcrylene Dimethicone | HALLBRITE® PSF* | 3.00 | Photostabilizer | |
| Diisobutyl Adipate | HALLTRESS® DIBA SPECIAL | 5.00 | Sunscreen Solvent / Emollient | |
| C | Butyl Methoxydibenzoylmethane [Avobenzone] | 2.00 | UV Filter / Sunscreen Agent | |
| D | Sorbitan Isostearate | 0.10 | Emulsifier | |
| Glyceryl Stearate | HALLSTAR® GMS PURE | 1.14 | Emulsifier | |
| PEG-100 Stearate | HALLSTAR® PEG 4400 MS | 0.86 | Emulsifier | |
| Potassium Cetyl Phosphate, Hydrogenated Palm Glycerides | 3.00 | Emulsifier | ||
| VP/Eicosene Copolymer | 1.00 | Film Former | ||
| E | Preservative | a.n. | Preservative | |
| Acrylamide/Sodium Acryloyldimethyltaurate Copolymer, Isohexadecane, Polysorbate 80 | 2.00 | Thickener (Nonaqueous) | ||
| Silica (spherical, 12 µm) | 2.00 | Feel Modification / Enhancement |
| 1 | To the main vessel, add the liquids from phase A and start mixing. Dissolve the Disodium EDTA, then add the Xanthan. |
| 2 | Mix phase A until Xanthan is fully incorporated and then begin heating to 85°C. |
| 3 | In a separate vessel, add phase B ingredients and start mixing. When solution is homogenous, add phase C to phase B. |
| 4 | Begin heating phase BC to 85°C with continued mixing. When Avobenzone is dissolved, add phase D ingredients to phase BC, in order. |
| 5 | When both phases are at temperature and homogenous, add oil phase BCD to water phase A with prop mixing. |
| 6 | Homogenize for 3 minutes or until 55°C, then return to prop mxing. At 45°C or lower, add phase E ingredients, one by one, with mixing. |
| 7 | Continue mixing and cooling until room temperature, replace any water lost, mix until smooth. Perform quality assurance checks. |
| Appearance | Thick, white lotion |
| Viscosity (Brk, RVDV-II, T-D, 20 rpm, after 24 h at room temperature; mPa·s) | 6600 - 11000 |
| pH | 5.5 - 6.5 |
*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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