Design and evaluation of a water-resistant sunscreen preparation
Richard S. Berger , James A. Mezick , Christopher M. Papa

Synopsis

A water resistant sunscreen preparation was formulated to function during swimming, exercising and sunbathing. The sunscreen agent, octyl p - N,N-dimethylamino benzoate (PABA) and an ammonium acrylate\/acrylate ester polymer were combined in a cosmetically pleasing oil-in-water, fugitive amine, lotion vehicle. When applied to skin, a substantive film forms which does not interfere with transepidermal water loss or normal sweat gland function. Double blind clinical studies showed that this water-resistant sunscreen preparation provided protection from sunburn after 60 min swimming in fresh or salt water. This water-resistant sunscreen preparation was found to be safe and of low irritancy, allergenic, sting and stain potential.

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