This oil-in-water sunscreen lotion provides high UV protection. The combination of SolaStay® S1, Polycrylene®, and HallBrite® BHB contributes a very strong photostability for avobenzone. In vitro testing suggests SPF ~76, PFA (PPD) ~23 performance with critical wavelength = 377 nm. In vivo testing in a US laboratory (5 subjects) yielded static SPF 85, with 80 minute water resistant SPF 80.
| Phase | INCI Name [INN/USAN] (Other Information) | Trade Name | % Wt | Function |
|---|---|---|---|---|
| A | Water (Aqua) | up to 100 | Volatile Carrier | |
| Butylene Glycol | 3.00 | Humectant | ||
| Acrylates/C10-30 Alkyl Acrylate Crosspolymer | 0.25 | Thickener (Aqueous) | ||
| B | Disodium EDTA | 0.05 | Chelating Agent | |
| Potassium Cetyl Phosphate | 1.20 | Emulsifier | ||
| C | Octocrylene [Octocrilene] | 10.00 | UV Filter / Sunscreen Agent | |
| Ethylhexyl Salicylate [Octisalate] | 5.00 | UV Filter / Sunscreen Agent | ||
| Homosalate [Homosalate] | 15.00 | UV Filter / Sunscreen Agent | ||
Butyloctyl Salicylate | HallBrite® BHB* | 5.00 | Sunscreen Solvent / Emollient | |
Ethylhexyl Methoxycrylene | SolaStay® S1* | 3.00 | Photostabilizer | |
Polyester-8 | Polycrylene®* | 4.00 | Photostabilizer | |
| D | Butyl Methoxydibenzoylmethane [Avobenzone] | 3.00 | UV Filter / Sunscreen Agent | |
| E | VP/Eicosene Copolymer | 2.00 | Film Former | |
| Beeswax (Cera Alba) | 0.40 | Stabilizing Agent | ||
| F | Styrene/Acrylates Copolymer (hollow spherical, 325 nm) | 3.00 | SPF Booster | |
| G | Triethanolamine | 0.50 | pH Adjuster | |
| Preservative | a.n. | Preservative |
PREPARATIVE PROCEDURE
| 1 | To the main vessel add liquids of phase A, start mixing and disperse Pemulen TR-2 with strong mixing for 20-30 minutes. |
| 2 | Heat dispersion with gentle mixing to 70-75 °C, add phase B in phase A and mix until dissolved. |
| 3 | To a secondary vessel add phase C, start mixing and add phase D. Heat to 70 - 75°C and then add phase E with mixing. Add phase F before combination and mix until uniform. |
| 4 | When both phases are homogeneous and at their designated temperatures, add phase CDEF to phase AB. |
| 5 | Strong mix ABCD for 3 minutes and then cool batch. |
| 6 | When batch is below 50°C add phase G with mixing, replace any water lost and mix until smooth. |
PRODUCT CHARACTERISTICS (25°C)
| Appearance | Off-white lotion |
| pH (as is) | 6.5 - 7.5 |
| Viscosity (10 rpm, Brk, RVDV, T-D, after 24h at room temperature; mPa·s): | 2500 - 4000 |
*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
The Hallstar Company - 120 South Riverside Plaza Suite 1620 - Chicago, IL 60606-3911 USA hallstarbeauty.com