Oh, patents! Blue Lizard® sunscreen Z-cote®
Copyright
© Françoise Herrmann
The US manufactured, Australian Blue Lizard® sunscreen with a patented Smart Bottle™
that turns blue in the presence of UV radiation, also uses a patented zinc oxide Z-cote® formula. According to the inventors, Zinc oxide is the most effective,
stable and safe, broad spectrum UVA and UVB protection agent. The Z-cote®
formulation of zinc oxide, disclosed in the WIPO patent application WO2013173336, titled Easily formulated Zinc oxide, is a patented process that micronizes zinc oxide
into nanoparticles with a mean particle distribution (D50) ranging
between 300 nm to 600 nm (with no particles smaller <100 nm), and further coats the particles to make them hydrophobic (resistant to water). This coated
nanoparticle zinc oxide powder has the advantage of dispersing evenly (without
clustering) in the rest of the formula, and on the skin, thus providing users
with an even zinc oxide application, which both protects from harmful
UVA and UVB radiation, and remains resistant to water.
Thus the patented
Z-cote® process means that you can
retain sun protection in the water, and use the sunscreen for sports activity,
where sweating will not make the formula run into your eyes or off your skin. Indeed,
Blue Lizard® claims that their Sports formula and Very water resistant Regular
formula afford 240 minutes of protection is whirlpool water, which amounts to three
times more than the US standards for water resistant sunscreen (set to 80
minutes).
Cool sunscreen… for runners,
triathletes, bikers, tennis players… plus more… outdoor folks, now that summer is around the corner!
The
abstract of patent application WO2013173336, titled Easily formulated Zinc
oxide, appears below with an image above of
the marketed Sports and Very water resistant Regular formulas for Blue Lizard® Sunscreen.
The present disclosure relates to polymeric siloxane
coated zinc oxide powders having a mean particle size number distribution (D50)
ranging from about 300 nm to about 600 nm and their use in sunscreen
compositions. The relatively high surface area (in relation to particles of
<100 nm) avoids agglomeration resulting in ease of formulation and high
dispersal of the particles which tends toward less light scatter and hence
better transparency in formulations. Furthemore, the combination of the
particular particle size number distribution (D50) of zinc oxide ranging as
above with bis(resorcinyl)triazine UV absorbers shows unexpected increased UV-A
absorbance (320 to 400 nm) in comparison to the zinc oxide and bis resorcinyl
triazine UV absorbers on their own at the same concentration.
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For
your tiny and bigger tots, Blue Lizard® also has a special Baby formula! So you
and your family can all stay protected with a sunscreen that is choc-full of
patents.
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