Urea derivatives, process for their manufacture and their use as light protecting agents for polymers

Claim 1

Urea derivatives of the formula (I) ##STR3## in which R 1 and R 2 denote identical or different straight chain or branched alkyl radicals having from 1 to 12 carbon atoms, or R 1 and R 2 together with the carbon atom to which they are linked denote a cyclopentane or cyclohexane ring which may be methylsubstituted or a 2,2,6,6-tetramethylpiperidine ring carbon atom 4 of which is identical with carbon atom 7 of the spirodecane system; R 3 denotes hydrogen, alkyl or isoalkyl having from 1 to 30 carbon atoms, or aralkyl having from 7 to 10 carbon atoms; R 4 denotes hydrogen, alkyl having from 1 to 30 carbon atoms, phenyl or naphthyl which may be substituted by a halogen atom, or alkyl having from 1 to 4 carbon atoms, or denotes aralkyl with 7 to 10 carbon atoms, or R 3 and R 4 may also be together with the carbon atom by which they are linked a cycloalkane ring having from 4 to 20 carbon atoms which may be substituted by C 1 to C 4 alkyl radicals; R 5 denotes hydrogen, oxygen or C 1 -C 4 alkyl; n is 1 or 2 depending on the valence of R 6 , R 6 , with n being 1, denotes alkyl having from 1 to 20 carbon atoms, alkenyl having from 2 to 18 carbon atoms, cycloalkyl having from 5 to 12 carbon atoms which may be substituted by a C 1 -C 4 -alkyl radical; phenyl or naphthyl which may be substituted by a chlorine atom or alkyl having from 1 to 18 carbon atoms; or phenylalkyl having from 7 to 18 carbon atoms, or R 6 , with n being 2, denotes a straight chain or branched alkylene group having from 2 to 20 carbon atoms, or phenylene or naphthylene which may be substituted by C 1 -C 4 alkyl, or a diphenylenealkane radical having from 13 to 18 carbon atoms.