| abstract |
The invention relates to novel indanylidene compounds which are effective in absorbing ultra violet radiation and to light screening compositions comprising said indanylidene compounds of the general formula I (see formula I) wherein X signifies O or NH; R1 signifies C1-C20 alkyl, C2-C20 alkyl in which at least one methylene group is replaced by oxygen, C3-C20 alkenyl, C3-C20 alkynyl or a group YS; R2 signifies C1-C20 alkyl, C2-C20 alkyl in which at least one methylene group is replaced by oxygen, C3-C20 alkenyl, C3-C20 alkynyl or a group YS; or R1 and R2 can combine on adjacent C-atoms to form a dioxomethylene ring; R3 signifies C1-C20 alkyl, C2-C20 alkyl in which at least one methylene group is replaced by oxygen, C3-C20 alkenyl, C3-C20 alkynyl or a group YS; R4, R5, R6 each independently signify H or C1-C20 alkyl; n signifies 0, 1 or 2; Y signifies a linker group; S signifies a silane-, an oligosiloxane- or a polysiloxane-moiety; with the proviso that at least one of the residues R1, R2 or R3 signifies YS. |