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National Starch Personal Care Finds a Solution for Enhancing the Water Resistance Properties of Inorganic UV Filters


Improved Water Resistance Is Realized In Sunscreen Formulations Containing the AMAZE™ XT Polymer

At the Florida Sunscreen Symposium in Lake Buena Vista, National Starch Personal Care presented a technical solution that promises to expand the use of inorganic UV filters in water resistance sunscreen formulations. Data made public during a technical poster presentation indicated that sunscreen formulations manufactured with a special rheology modifier and film forming polymer had, in combination, served to significantly boost the water resistance properties of titanium dioxide and zinc oxide. The research findings pave the way for makers of sunscreen products to incorporate inorganic UV filters into water resistant beach wear, sports wear and daily wear formulas without technical challenges.

According to Maria Tolchinsky, Marketing Manager at National Starch Personal Care, adding the AMAZE™ XT polymer in conjunction with a water soluble film forming polymer delivers enhanced SPF and water resistance to systems formulated with inorganic UV filters. “Until now, it has been a real challenge to make inorganic UV filters water resistant in finished sun care formulas,” she said. “The AMAZE XT polymer solves this problem, allowing formulators to achieve what they have always wanted, mainly the ability to incorporate mild and safe inorganic UV filters into water resistant baby sun care formulas, beach wear and daily wear formulas,” she said.

Sun care formulators give inorganic UV filters high marks when it comes to formulating products for broad spectrum protection, one of the most important attributes demanded by consumers today. Yet inorganic UV filters have been used in a very limited set of sunscreen products because they are difficult to suspend in finished formulations without agglomeration. A lack of compatibility with rheology modifiers has further limited its use in sunscreen formulas.

According to Tolchinsky, the solution to these on-going problems has been found. “National Starch Personal Care tested several formulations in-vitro and in-vivo and found that when AMAZE XT was combined with DERMACRYL film forming polymer, the water resistant sunscreens products remained stable, and delivered water resistant protection” she said.

A Boost in SPF Value

One of the most important findings published by National Starch Personal Care this week pertains to SPF value. It was found that a combination of AMAZE XT and DERMACRYL AQF polymers gave a higher in-vivo SPF value than a control group in both pre and post-immersion conditions.

According to Tolchinsky, the implications for this finding may be significant in light of the new rules proposed by the FDA. “Pending regulations regarding the measurement of UVA may prompt formulators to look closer at formulating with broad spectrum inorganic UV filter, and at strategies that effectively boost the SPF value of finished formulations made with these filters,” she said.


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