Stabilizer combination

A composition comprising

• (A) an organic material which is sensitive to damage by light, oxygen and/or heat, and
• (B) a stabilizer, which is a mixture comprising a compound of the formula I ##STR34## and a compound of the formula II ##STR35## in which n is 1 or 2;
• R.sub.1, R'.sub.1, R.sub.2 and R'.sub.2, independently of one another, are H, C.sub.1 -C.sub.12 alkyl;
• C.sub.2 -C.sub.6 alkenyl;
• C.sub.1 -C.sub.12 alkoxy;
• C.sub.2 -C.sub.18 alkenoxy;
• halogen;
• trifluoromethyl;
• C.sub.7 -C.sub.11 phenylalkyl;
• phenyl;
• phenyl which is substituted by C.sub.1 -C.sub.18 alkyl, C.sub.1 -C.sub.18 alkoxy or halogen;
• phenoxy;
• or phenoxy which is substituted by C.sub.1 -C.sub.18 alkyl, C.sub.1 -C.sub.18 alkoxy or halogen;
• R.sub.3 and R.sub.4, independently of one another, are H, C.sub.1 -C.sub.12 alkyl;
• C.sub.2 -C.sub.6 alkenyl;
• C.sub.1 -C.sub.12 alkoxy;
• C.sub.5 -C.sub.12 cycloalkoxy;
• C.sub.2 -C.sub.18 alkenoxy;
• halogen;
• trifluoromethyl;
• C.sub.7 -C.sub.11 phenylalkyl;
• phenyl;
• phenyl which is substituted by C.sub.1 -C.sub.18 alkyl, C.sub.1 -C.sub.18 alkoxy or halogen;
• phenoxy;
• or phenoxy which is substituted by C.sub.1 -C.sub.18 alkyl, C.sub.1 -C.sub.18 alkoxy or halogen;
• R.sub.6 is hydrogen, C.sub.1 -C.sub.24 alkyl, C.sub.5 -C.sub.12 cycloalkyl or C.sub.7 -C.sub.15 phenylalkyl;
• R.sub.7, in the case where n=1, and R'.sub.7, independently of one another, are hydrogen or C.sub.1 -C.sub.18 alkyl;
• or are C.sub.1 -C.sub.12 alkyl which is substituted by OH, C.sub.1 -C.sub.18 alkoxy, allyloxy, halogen, --COOH, --COOR.sub.8, --CONH.sub.2, --CO.sub.9, --CON(R.sub.9)(R.sub.10), --NH.sub.2, --NHR.sub.9, --N(R.sub.9) (R.sub.10), --NHCOR.sub.11, --CN, --OCOR.sub.11, phenoxy and/or phenoxy which is substituted by C.sub.1 -C.sub.18 alkyl, C.sub.1 -C.sub.18 alkoxy or halogen;
• or R.sub.7 is C.sub.3 -C.sub.50 alkyl which is interrupted by --O+ and may be substituted by OH;
• or R.sub.7 is C.sub.3 -C.sub.6 alkenyl;
• glycidyl;
• C.sub.5 -C.sub.12 cycloalkyl;
• cyclohexyl which is substituted by OH, C.sub.1 -C.sub.4 alkyl or --OCOR.sub.11 ;
• C.sub.7 -C.sub.11 phenylalkyl which is unsubstituted or substituted by OH, Cl or CH.sub.3 ;
• --CO--R.sub.12 or --SO.sub.2 --R.sub.13 ;
• R.sub.7, in the case where n=2, is C.sub.2 -C.sub.16 alkylene, C.sub.4 -C.sub.12 alkenylene, xylylene, C.sub.3 -C.sub.20 alkylene which is interrupted by O and/or substituted by OH, or is a group of the formula --CH.sub.2 CH(OH)CH.sub.2 O--R.sub.20 --OCH.sub.2 CH(OH)CH.sub.2 --, --CO--R.sub.21 --CO--, --CO--NH--R.sub.22 --NH--CO-- or --(CH.sub.2).sub.m --COO--R.sub.23 --OOC--(CH.sub.2).sub.m --, in which m is a number in the range from 1 to 3, or is ##STR36## R.sub.8 is C.sub.1 -C.sub.18 alkyl;
• C.sub.2 -C.sub.18 alkenyl;
• C.sub.3 -C.sub.50 alkyl which is interrupted by O, NH, NR.sub.9 or S and/or is substituted by OH;
• C.sub.1 -C.sub.4 alkyl which is substituted by --P(O) (OR.sub.14).sub.2, --N(R.sub.9) (R.sub.10) or --OCOR.sub.11 and/or OH;
• glycidyl;
• cyclohexyl;
• phenyl;
• C.sub.7 -C.sub.14 alkylphenyl or C.sub.7 -C.sub.11 phenylalkyl;
• R.sub.9 and R.sub.10, independently of one another, are C.sub.1 -C.sub.12 alkyl;
• C.sub.3 -C.sub.12 alkoxyalkyl;
• C.sub.4 -C.sub.16 dialalkylaminoalkyl or C.sub.5 -C.sub.12 cycloalkyl, or R.sub.9 and R.sub.10 together are C.sub.3 -C.sub.9 alkylene or -oxaalkylene or -azaalkylene;
• R.sub.11 is C.sub.1 -C.sub.18 alkyl;
• C.sub.2 -C.sub.18 alkenyl or phenyl;
• or is C.sub.3 -C.sub.50 alkyl which is interrupted by --O-- and may be substituted by OH;
• R.sub.12 is C.sub.1 -C.sub.18 alkyl;
• C.sub.2 -C.sub.18 alkenyl;
• phenyl;
• C.sub.1 -C.sub.18 alkoxy;
• C.sub.3 -C.sub.18 alkenyloxy;
• C.sub.3 -C.sub.50 alkoxy which is interrupted by O, NH, NR.sub.9 or S and/or substituted by OH;
• cyclohexyloxy;
• C.sub.7 -C.sub.14 alkylphenoxy;
• C.sub.7 -C.sub.11 phenylalkoxy;
• phenoxy;
• C.sub.1 -C.sub.12 alkylamino;
• phenylamino;
• tolylamino or naphthylamino;
• R.sub.13 is C.sub.1 -C.sub.12 alkyl;
• phenyl;
• naphthyl or C.sub.7 -C.sub.14 alkylphenyl;
• R.sub.14 is C.sub.1 -C.sub.12 alkyl, methylphenyl or phenyl;
• R.sub.20 is C.sub.2 -C.sub.10 alkylene;
• C.sub.4 -C.sub.50 alkylene which is interrupted by O, phenylene or a -phenylene-X-phenylene- group, in which X is --O--, --S--, --SO.sub.2 --, --CH.sub.2 -- or --C(CH.sub.3).sub.2 --;
• R.sub.21 is C.sub.2 -C.sub.10 alkylene, C.sub.2 -C.sub.10 oxaalkylene, C.sub.2 -C.sub.10 thiaalkylene, C.sub.6 -C.sub.12 arylene or C.sub.2 -C.sub.6 alkenylene;
• R.sub.22 is C.sub.2 -C.sub.10 alkylene, phenylene, tolylene, diphenylenemethane or a ##STR37## group;
• and R.sub.23 is C.sub.2 -C.sub.10 alkylene or C.sub.4 -C.sub.20 alkylene which is interrupted by O.