Advantages of new solubiliser for sunscreen actives
Hallstar has been focusing on UVA protection for over 20 years, long before the global regulatory push for higher UVA protection of the last half decade.
To ensure that sun protection remains reliably effective, Hallstar focuses on proactive photo-stabilisation, where scientifically designed stabilisers enable existing ingredients, such as UV filters and cosmetic actives (vitamin A, resveratrol and other light sensitive species), as well as endogenous chromophores in human skin.
For example, avobenzone is the only globally-approved chemical UVA1 filter, providing broad-spectrum protection against UVA irradiation. However, like many other UV filters, sun exposure causes it to degrade if it cannot transfer energy to other ingredients. Upon exposure to UV irradiation, avobenzone rapidly converts from the effective enol form to the short-absorbing and photoreactive keto form, so it is not photostable—leading to sun protection that is not very long lasting.
Matching the polarity of the solvent system (as measured by their dielectric constants) to that of the UV filters optimises transfer of energy to the solvent system and reduces the electrons’ excited state – returning them to their ground state more effectively and thereby reducing UV filter degradation.
One of the key advantages of Hallstar’s prototypal solubiliser for sunscreen actives, HallBrite BHB (INCI: Butyloctyl Salicylate), is its higher polarity relative to traditional solvents.
But the benefits of this multi-functional ingredient don’t stop there.
• HallBrite BHB helps colour cosmetics with pigment wetting and pigment binding. This leads to better colour matching and improved results on foundation drop tests.
• It improves formulation aesthetics while imparting an elegant moisturising feel to the skin as an odourless and colourless liquid.
• It is an excellent carrier and dispersant for micronised titanium dioxide and zinc oxide.
The unique characteristics of HallBrite BHB has allowed Hallstar to produce the highest performing, aesthetically pleasant TiO2 dispersion, HallBrite EZ-FLO TDX (INCI: Butyloctyl Salicylate (and) Titanium Dioxide (nano) [Titanium Dioxide] (40%) (and) Triceteareth-4 Phosphate (and) Dimethicone Crosspolymer (and) Silica).
Hallstar’s updated brochure includes detailed data that illustrates why customers choose HallBrite BHB as a:
• low viscosity SPF/PFA booster
• high-emolliency solvent
• highly effective metal oxide dispersant
• competitively priced solubilizer for improved formulation cost-performance
• globally-approved sun care ingredient
