22 SUN CARE DAILY SKIN DEFENSE FOOT SPA MAUI MILK FOOT SPA
Before
Before
After
after 30 minutes with the formulations without clay. Especially with the Maui milk, where the formulation without clay has completely disappeared into the avocado. We achieved the same results for formulations containing Luxe WN compared to the ones containing no clay, but with the emulsifiers.
Testing SPF boosting effects: scientific and creative approaches! The combination of rheology, application and stability should give us the ultimate goal of SPF boosting. Elementis chemists are sharing the results of in vitro testing – along with a creative approach to early in vivo testing! Here are some results of in vitro testing: Our chemists also wanted to know how
improved film structure and integrity can affect the hydrophobicity of products. We measured the contact angle of a water droplet on a glass slide with the sunscreen applied to it. A larger contact angle means that the water sits more on the film, whereas a smaller contact angle means it spreads more. Formulations with a contact angle above 30° can give an indication of hydrophobicity. Our chemists did not include data on Hydroclays because they are water-based thickeners and do not affect the hydrophobicity of products. With the Daily Skin Defense Lotion
formulation, we have increased the contact angle of the water droplet for the sunscreen with Gel TN V by 20%. For the Maui Milk formulation with Gel HS V, chemists achieved a nearly 60% increase in the contact angle. Because all the formulations without Elementis’s natural clay-based Gel contain the ingredients of the gel - just without the clay, one will see the pure effect of the clay and not the oil in the gel. With Luxe WN, chemists achieved the same boosting effect, with a 90% increase in the contact angle for the UV Blocking protector and a six times higher contact angle for the Solar Skin Frosting. Still, our chemists wanted to show SPF
boosting capabilities in real life. Initial testing was performed utilising a foot spa
PERSONAL CARE May 2021 MAUI MILK AFTER WASHING
After
Before: right plus, left minus_3 SOLAR SKIN FROSTING BEFORE FOOT SPA
After: left minus, right plus
Before Figure 4: In vitro testing images.
to evaluate the water resistance in vivo. Sunscreens were applied to their feet and left to dry for 20 minutes, then put in a foot spa with turbulence for 40 minutes. Afterwards, photos were taken of their feet utilizing the sunscreen device. See the examples (Fig 4) demonstrating the Daily Skin Defense Lotion after the tester’s feet were submerge in the foot spa which show that Elementis’s natural clay-based Gel can still be clearly seen on the foot. Typically, when this product is rubbed properly into the skin, it does not leave a white finish; however, this was done here for the visual effect. For the Maui Milk, one can see how much
better the sample with Gel HS V is after washing compared to the sample without clay as well as how much of the lotion has been lost with the sample without clay.
PC
www.personalcaremagazine.com
Conclusion Natural clays provide numerous benefits to consumers who are seeking sun care products that address the current megatrends and deliver on the sun protection claims. Formulators can incorporate a wide range of clay ingredients to create elegant and novel textures while giving stability and enhancing the efficiency of the overall product.
ABOUT THE AUTHORS
Authors of this article are members of the Elementis Personal Care team based in the United States and Europe: Kate Waterman, Global Technical Services Manage; Christina Schenatzky, Applications Specialist; and Silke Valentin, Global Applied Research Manager.
After
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84 |
Page 85 |
Page 86 |
Page 87 |
Page 88 |
Page 89 |
Page 90 |
Page 91 |
Page 92
