A broad spectrum oil-in-water sunscreen lotion. This formula is suitable for beachwear or any outdoor activity and provides superior broad-spectrum protection against both the burning and aging rays of the sun. SolaStay® S1, an extremely rapid singlet state quenching photostabilizer, and triple state quenching Polycrylene® help keep the formulation from losing effectiveness during sun exposure. It was subjected to in vitro analysis and delivered SPF ~ 50, PFA (PPD) ~ 18 performance with critical wavelength 379 nm.
Phase | INCI Name [INN/USAN] (Other Information) | Trade Name | % Wt | Function |
---|---|---|---|---|
A | Ethylhexyl Salicylate [Octisalate] | 4.50 | UV Filter / Sunscreen Agent | |
Homosalate [Homosalate] | 10.00 | UV Filter / Sunscreen Agent | ||
Polyester-8 | POLYCRYLENE®* | 3.00 | Photostabilizer | |
Ethylhexyl Methoxycrylene | SolaStay® S1* | 2.00 | Photostabilizer | |
Butyloctyl Salicylate | HALLBRITE® BHB* | 5.00 | Emollient / Sunscreen Solvent | |
B | Butyl Methoxydibenzoylmethane [Avobenzone] | 3.00 | UV Filter / Sunscreen Agent | |
C | VP/Eicosene Copolymer | 2.00 | Film Former | |
Glyceryl Stearate | HALLSTAR® GMS PURE | 0.80 | Emulsifier | |
PEG-100 Stearate | HALLSTAR® PEG 4400 MS | 1.50 | Co-emulsifier | |
Polyglyceryl-3 Methylglucose Distearate | 1.50 | |||
D | Styrene/Acrylates Copolymer (hollow spherical, 325 nm) | 4.00 | SPF Booster | |
E | Water (Aqua) (deionized) | up to 100 | Volatile Carrier | |
Disodium EDTA | 0.05 | Chelating Agent | ||
Acrylates/C10-30 Alkyl Acrylate Crosspolymer | 0.15 | Thickener (Aqueous) | ||
F | Potassium Hydroxide | 0.76 | pH Adjuster | |
G | Glycerin | 3.00 | Humectant | |
Preservative | a.n. | Preservative |
1 | To a secondary vessel add phase A, start mixing and slowly add phase B to phase A with continued mixing. |
2 | Heat phase AB to 85°C, add phase C ingredients in order with mixing, and then add phase D and mix until phase D is fully dispersed. |
3 | To the main vessel add the Water of phase E, start mixing, add the other phase ingredients in order, and heat to 80°C. |
4 | When both phases ABCD and E are homogeneous and at designated temperatures, slowly add phase ABCD to phase E with mixing. |
5 | Homogenize batch intensively for 3 minutes, resume sweep mixing, start cooling and, when the batch is at 55°C, add phase F. |
6 | When batch is uniform add phase G premix and continue mixing. |
7 | When the batch is uniform add deionized water to correct for evaporative losses and continue mixing until smooth. |
Appearance | Pale yellow lotion |
Viscosity (Brk, RVDV-II, T-D, 20 rpm, after 24 h at room temperature; mPa·s) | 3000 - 6000 |
pH | 6.5 - 7.5 |
*Patented and Patent Pending
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