Photostable cosmetic light screening compositions

摘要

Photostable, cosmetic light-screening compositions comprise, in a cosmetically acceptable vehicle containing at least one fatty phase, about 0,5 to about 5 %, in particular about 1 to about 4 % by weight, of a dibenzoylmethane type UV-A screening agent and at least about 0,1 % to about 20 %, in particular about 0,5 to about 15% by weight, of a polymer UV-B filter of the benzylidene malonate silicone type comprising an organosiloxane having at least one unit of the general formula <CHEM> wherein U is <CHEM> or -C(R<1>)=CH-(CR<1>2)n- and V is -CR<1>2-CHR<1>-(CR<1>2)n- or <CHEM> any other units present in the said siloxanes being those represented by the general formula <CHEM> wherein R represents a C1-8 alkyl or an aryl group, R<1> is a hydrogen atom or a C1-5 alkyl group, R<2> is a hydrogen atom, a C1-5 alkyl group or a group OR<1>, R<3> is a C1-5 alkyl group, R'' represents a hydrogen atom, a monovalent C1-8 hydrocarbon or halogenated hydrocarbon group, a has a value of 0, 1 or 2, b has a value of 0, 1, 2 or 3 and n has a value of from 1 to 6, provided that the group -U-O- or the group -V-O- and the two R<2> groups are linked to the aromatic ring (C6...) at the para- and both meta-positions in relation to the group -CH=CÄC(O)OR<3>Ü2, the weight ratio of the silicone to the dibenzoylmethane derivative being not less than ca. 0.1, preferably not less than ca. 1,0 and not more than ca. 25, preferably not more than ca. 8 to 10.