This formulation was designed to provide broad spectrum (SPF/PFA ≤3) performance. Combining SolaStay® S1 and HallBrite® ISO is incorporated to mitigate the photocatalytic and reactive oxygen species generating activities of Titanium Dioxide and to rapidly and efficiently quench the excited states of Avobenzone, protecting it from photodegradation, and so improve sunscreen performance. HallBrite® BHB aids wetting and dispersion of the Titanium Dioxide and contributes to UV filter solubility and enhanced product feel. This formulation was subjected to in vitro analysis and delivered SPF ~55, PFA (PPD) ~37 performance with critical wavelength 380 nm. (5 Stars UVA/UVB 1.04-1.02)
Phase | INCI Name [INN/USAN] (Other Information) | Trade Name | % Wt | Function |
---|---|---|---|---|
A | Ethylhexyl Methoxycrylene | SolaStay® S1* | 2.00 | Photostabilizer |
Octyldodecyl Methoxycrylene | 私密內容: HALLBRITE® ISO* | 2.00 | Photostabilizer | |
Ethylhexyl Salicylate [Octisalate] | 5.00 | UV Filter / Sunscreen Agent | ||
Diisobutyl Adipate | HALLTRESS® DIBA SPECIAL | 6.00 | Emollient | |
Butyloctyl Salicylate | HALLBRITE® BHB* | 5.00 | Emollient / Sunscreen Solvent | |
B | Titanium Dioxide [Titanium Dioxide], Aluminum Hydroxide (60 nm primary particle size) | 3.50 | UV Filter / Sunscreen Agent | |
C | Cetearyl Alcohol | HALLSTAR® TA-1618 CETEARYL ALCOHOL | 0.50 | Thickener (Nonaqueous) |
VP/Eicosene Copolymer | 1.00 | Film Former | ||
Glyceryl Stearate | HALLSTAR® GMS PURE | 1.35 | Emulsifier | |
PEG-100 Stearate | HALLSTAR® PEG 4400 MS | 1.00 | Co-emulsifier | |
Potassium Cetyl Phosphate, Hydrogenated Palm Glycerides | 2.00 | Emulsifier | ||
D | Butyl Methoxydibenzoylmethane [Avobenzone] | 3.50 | 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 | 2.00 | Thickener (Aqueous) |
1 | In secondary vessel add phase A and start mixing. Disperse phase B with continue mixing. |
2 | Heat AB to 85C and then, add phase C with mixing. |
3 | Add phase D into ABC and mix well until phase D is dissolved. |
4 | Add water of phase E to the main vessel, dissolve EDTA with mixing and then add Xanthan Gum, stirring until fully incorporated. |
5 | Start heating to 80C, and add premixed of phase F. |
6 | When both phases are homogenous and at their designated temperatures, slowly add Oil phase (ABCD) to the water phase (DE) with prop mixing. |
7 | Start homogenizing for 3 mins. Resume prop mixing, and start cooling down until room temperature. |
8 | Add phase G when batch < 40C with mixing. Replace any water lost to evaporation, and mix until smooth. |
Appearance | Off White cream |
Viscosity (Brk, RVDV-II, Sp 4, 20 rpm, after 24 h at room temperature; mPa·s) | 13000 - 22000 |
pH | 5.5 - 6.5 |
*Patented and Patent Pending
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