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
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