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Use of polymeric compounds, such as rheology modifiers and film-forming agents, to optimise UV-photoprotecting combinations within suncare products Disclosure Number: IPCOM000033667D
Publication Date: 2004-Dec-22

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The Prior Art Database


Disclosed are rheology modifiers and film-forming agents, which are useful ingredients for the improvement of the performance of cosmetic and pharmaceutical sunscreen compositions like stability and rheological behavior but also cosmetic attractive appeal.

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Use of polymeric compounds, such as rheology modifiers and film-forming agents, to optimise UV-photoprotecting combinations within suncare products

Disclosed is the use of an effective UV-photoprotecting combination comprising at least one micronized organic insoluble UV-screening agent with a mean particle size ranging from 0,01 µm to 2 µm, and at least one polymeric compound, which belongs to the functional group of rheological additives and/or film-forming agents (hereby described), in cosmetic or pharmaceutical preparations.

The term functional group in this context comprises the polymers, naturals or synthetics/semi-synthetics, that are able to thicken, suspend or improve the stability of dispersions comprising the insoluble UV screening agents, like Tinosorb M, within any emulsion-types and that keep those particulate UV filters within a uniform and water-resistant layer deposited on the skin surface. 

The UV-photoprotecting combination optionally contains one or more than one further UV absorbers such as listed in Tables 1 to 3.

Preference is given to the use of the micronized organic insoluble UV-screening agent and the additional UV absorber(s) listed in Table1, 2 and 3. having a mixture ratio from 1:99 to 99:1 and most preferably from 20:80 to 80:20.

Table 1. Suitable UV filter substances which can be additionally used in cosmetic or phar­ma­ceutical preparations

p-aminobenzoic acid derivatives, for example 4-dimethylaminobenzoic acid 2-ethylhexyl ester;

salicylic acid derivatives, for example salicylic acid 2-ethylhexyl ester;

benzophenone derivatives, for example 2-hydroxy-4-methoxybenzophenone and its 5‑sulfonic acid derivative;

dibenzoylmethane derivatives, for example 1-(4-tert-butylphenyl)-3-(4-methoxyphenyl)­propane-1,3-dione;

diphenylacrylates, for example 2-ethylhexyl 2-cyano-3,3-diphenylacrylate, and 3-(benzo­fura­nyl) 2-cyanoacrylate;

3-imidazol-4-ylacrylic acid and esters;

benzofuran derivatives, especially 2-(p-aminophenyl)benzofuran derivatives, described in EP-A-582 189, US‑A‑5 338 539, US‑A‑5 518 713 and EP‑A‑613 893;

polymeric UV absorbers, for example the benzylidene malonate derivatives described in EP‑A‑709 080;

cinnamic acid derivatives, for example the 4‑methoxycinnamic acid 2-ethylhexyl ester and isoamyl ester or cinnamic acid derivatives described in US‑A‑5 601 811 and WO 97/00851;

camphor derivatives, for example 3-(4'-methyl)benzylidene-bornan-2-one, 3-benzyl­idene­bornan-2-one, N-[2(and 4)-2-oxyborn-3-ylidene-methyl)-benzyl]acrylamide polymer, 3-(4'-trimethyl­ammonium)-benzylidene-bornan-2-one methyl sulfate, 3,3'-(1,4-phenylene­di­methine)-bis(7,7-dimethyl-2-oxo-bicyclo[2.2.1]heptane-1-methanesulfonic acid) and salts, 3-(4'-sulfo)­benzylidene-bornan-2-one and salts; camphorbenzalkonium methosulfate;

hydroxyphenyltriazine compounds, for example 2-(4'-methoxyphenyl)-4,6-bis(2'-hydroxy-4'-n-octyloxyphenyl)-1,3,5-triazine; 2,4-bis{[4-(3-(2-propyloxy)-2-hydroxy-propyloxy)-...