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Heated Sunless Tanning for Rapid Color and Other Topics: Literature Findings
By: Charles Fox, Independent Consultant
Posted: May 27, 2010, from the June 2010 issue of Cosmetics & Toiletries.
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Stable, long-lasting sunscreen: Kosei Co., Ltd. disclosed a w/o sunscreen composition that is stable and long-lasting, provides a good afterfeel to the skin, and blocks UV radiation.11 The composition is comprised of: a partially cross-linked polyether-modified organopolysiloxane; organotitanate-treated zinc oxide fine particles and/or organotitanate-treated titanium oxide particles; a silicone oil; glyceryl trioctanoate, glyceryl tri(caprate/caprylate) and/or neopentyl glycol dioctanoate; and inulin fatty acid ester and/or inulin hydrolyzate fatty acid ester. An example is shown in Formula 5.
Cationic copolymer for added radiance: Unilever PLC formulated a composition containing a cationic copolymer with a monomer unit of acryloylethyl tri(C1-C3 alkyl)ammonium salt in a cosmetically acceptable carrier with a starch to impart radiance with soft focus effects on the skin.12 Acrylamide/acryloylethyltrimethylammonium chloride/tris(hydroxymethyl)acrylamidomethane copolymer was the preferred cationic copolymer. In addition, a cross-linked cationic copolymer was used to significantly enhance the tanning effect, and no streaking was observed.
Pentaerythritol ester for gloss: Shiseido Co., Ltd. disclosed cosmetic compositions containing pentaerythritol mono(2-ethylhexanoate) tribenzoate and a carrier.13 The compositions apply smoothly and provide a glossy look. An example of a lipstick is shown in Formula 6.
Quick-drying nail polish: Mandom Corp. has utilized styrene copolymers, fatty acid esters, alkanediols and lower alcohols to create a nail polish that dries quickly and forms a long-lasting glossy film on the nails with good pigment dispersibility.14 The composition contains a styrene copolymer, a fatty acid ester nonionic surfactant, a C5-10 1,2-alkanediol, a lower alcohol and water. The composition may further contain a viscous mineral oil and/or a water-soluble polysaccharide. An example of a nail polish composition is shown in Formula 7.
Antibacterial peptides: Spiderbiotech S.r.l published a patent on monomeric and multimeric peptidic compounds that have antimicrobial activity, particularly against Gram positive and Gram negative bacteria.15 The compositions can be used for medical purposes, as disinfectants, in detergents or as preservatives. Methylbutyrate (1.9%), prenyl acetate (1.4%), 2-methylbutyl 2-methylbutyrate (1.2%) and 2-methylbutyl acetate (1.2%), were studied for their antimicrobial effects. Specifically, a Roman chamomile sample showed high antimicrobial activity against all strains of tested microbes.