| abstract |
Novel furancarboxylic acid derivatives of the general formula <IMAGE> where R1, R2 and R3 independently of one another are each hydrogen, C1-C8-alkyl, cyclohexyl or phenyl, but not more than two of these radicals are simultaneously hydrogen, and R4 is a radical of the formula -NR5R6, <IMAGE> or OR6, where A is a bridge member, R5 is hydrogen, C2-C6-alkenyl, C5-C7-cycloalkyl or C1-C12-alkyl which may or may not be interrupted by 1, 2 or 3 oxygen atoms, and R6 is a radical of the formula <IMAGE> where R7, R8, R9 and R10 are each C1-C4-alkyl, or R7 and R8 or R9 and R10 together form a tetramethylene or pentamethylene bridge, and R11 is hydrogen, C1-C8-alkyl, C3-C8-alkenyl, C2-C4-hydroxyalkyl or aralkyl, and their salts are useful as light stabilizers for organic polymers, in particular olefin polymers. |