Patent ID: 8119107

Claim:
A method for improving the UV stability of at least one component c) defined as an amino-substituted 2-hydroxybenzophenone derivative corresponding to formula wherein R 1 and R 2 , independently from each other are hydrogen; C 1- C 30 alkyl; C 2 -C 10 alkenyl; C 3 -C 10 cycloalkyl; or C 3 -C 10 cycloalkenyl; or R 1 and R 2 together form, with the nitrogen atom to which the are bonded a 5- or 6-membered heterocyclic ring member; R 3 and R 4 , independently from each other, are each C 1 -C 20 alkyl; C 2 -C 10 alkenyl; C 3 -C 10 cycloalkyl; C 3 -C 10 cycloalkenyl; C 1 -C 12 alkoxy; (C 1 -C 20 )alkoxycarbonyl; C 1 -C 12 alkylamino; di(C 1 -C 12 )alkylamino; an aryl or a heteroaryl radical which is optionally substituted; or a water-solubilizing substituent selected from a carboxylate group, a sulfonate group or an ammonium residue; X is hydrogen; —COOR 5 ; or —CONR 6 R 7 ; R 5 , R 6 and R 7 , independently from each other, are hydrogen; C 1 -C 20 alkyl; C 2 -C 10 alkenyl; C 3 -C 10 cycloalkyl; C 3 -C 10 cycloalkenyl, —(Y′O) 0 —Z′; or aryl; Y′ is —(CH 2 ) 2 —; —(CH 2 ) 3 —; —(CH 2 ) 4 —; or —CH—(CH 3 )—CH 2 —; Z′ is —CH 2 —CH 3 ; —CH 2 —CH 2 CH 3 ; —CH 2 CH 2 —CH 2 —CH 3 or —CH(CH 3 )—CH 3 ; n is an integer from 0 to 3; and o is an integer from 1 to 2, in the presence of (b) at least one dibenzoylmethane derivative; which method comprises adding to a cosmetic or dermatological composition comprising c) and b) an effective photo-stabilizing amount of a UV filter (a) defined by formula (I) 2-ethylhexyl2-cyano,3,3-diphenylacrylate of formula.