Benzotriazole UV absorbers having enhanced durability

Abstract

Benzotriazole UV absorbers which are substituted at the 5-position of the benzo ring by an electron withdrawing group exhibit enhanced durability and very low loss rates when incorporated into automotive coatings.

What is claimed is:  
     
         1 . A coating composition, stabilized with a benzotriazole, which benzotriazole exhibits enhanced durability and a low loss rate when incorporated in said coating, which composition comprises 
 (a) a resin selected from the group consisting of a thermoset acrylic melamine resin, an acrylic urethane resin, an epoxy carboxy resin, a silane modified acrylic melamine, an acrylic resin with carbamate pendant groups crosslinked with melamine or an acrylic polyol resin crosslinked with melamine containing carbamate groups, and    (b) 0.01 to 5% by weight, based on resin solids, of a benzotriazole of formula A, B, C or D  
                 
   wherein    G 1 , G 2  or T is an electron withdrawing radical,    G 1  is hydrogen or halogen,    G 2  is halogen, nitro, cyano, R 3 SO—, R 3 SO 2 —, —COOG 3 , CF 3 —, —P(O)(C 6 H 5 ) 2 , —CO—G 3 , —CO—NH—G 3 , —CO—N(G 3 ) 2 , —N(G 3 )—CO—G 3 ,  
                 
   G 3  is hydrogen, straight or branched chain alkyl of 1 to 24 carbon atoms, straight of branched chain alkenyl of 2 to 18 carbon atoms, cycloalkyl of 5 to 12 carbon atoms, phenylalkyl of 7 to 15 carbon atoms, phenyl, or said phenyl or said phenylalkyl substituted on the phenyl ring by 1 to 4 alkyl of 1 to 4 carbon atoms,    R 1  is hydrogen, straight or branched chain alkyl of 1 to 24 carbon atoms, straight of branched chain alkenyl of 2 to 18 carbon atoms, cycloalkyl of 5 to 12 carbon atoms, phenylalkyl of 7 to 15 carbon atoms, phenyl, or said phenyl or said phenylalkyl substituted on the phenyl ring by 1 to 4 alkyl of 1 to 4 carbon atoms,    R 2  is straight or branched alkyl chain of 1 to 24 carbon atoms, straight or branched chain alkenyl of 2 to 18 carbon atoms, cycloalkyl of 5 to 12 carbon atoms, phenylalkyl of 7 to 15 carbon atoms, phenyl, or said phenyl or said phenylalkyl substituted on the phenyl ring by 1 to 3 alkyl of 1 to 4 carbon atoms; or R 2  is hydroxyl or —OR 4  where R 4  is straight or branched chain alkyl of 1 to 24 carbon atoms; or said alkyl substituted by one or more —OH, —OCO—R 11 , —OR 4 , —NCO or —NH 2  groups or mixtures thereof; or said alkyl or said alkenyl interrupted by one or more —O—, —NH— or —NR 4 — groups or mixtures thereof and which can be unsubstituted or substituted by one or more —OH, —OR 4  or —NH 2  groups or mixtures thereof; or R 2  is —SR 3 , —NHR 3  or —N(R 3 ) 2 ; or R 2  is    (CH 2 ) m —CO—X—(Z) p —Y—R 15      wherein    X is —O— or —N(R 16 )—,    Y is —O— or —N(R 17 )—,    Z is C 2 -C 12 -alkylene, C 4 -C 12 -alkylene interrupted by one to three nitrogen atoms, oxygen atoms or a mixture thereof, or is C 3 -C 12 -alkylene, butenylene, butynylene, cyclohexylene or phenylene, each substituted by a hydroxyl group,    m is zero, 1 or 2,    p is 1, or p is also zero when X and Y are —N(R 16 )— and —N(R 17 )—, respectively,    R 15  is a group —CO—C(R 18 )═C(H)R 19  or, when Y is —N(R 17 )—, forms together with R 17  a group —CO—CH═CH—CO—, wherein R 18  is hydrogen or methyl, and R 19  is hydrogen, methyl or —CO—X—R 20 , wherein R 20  is hydrogen, C 1 -C 12 -alkyl or a group of the formula.  
                 
   wherein the symbols R 1 , R 3 , X, Z, m and p have the meanings defined above, and R 16  and R 17  independently of one another are hydrogen, C 1 -C 12 -alkyl, C 3 -C 12 -alkyl interrupted by 1 to 3 oxygen atoms, or is cyclohexyl or C 7 -C 15 aralkyl, and R 16  together with R 17  in the case where Z is ethylene, also forms ethylene,    n is 1 or 2,    when n is 1, R 5  is Cl, OR 6  or NR 7 R 8 , or    R 5  is —PO(OR 12 ) 2 , —OSi(R 11 ) 3  or —OCO—R 11 , or straight or branched chain C 1 -C 24 alkyl which is interrupted by —O—, —S— or —NR 11  and which can be unsubstituted or substituted by —OH or —OCO—R 11 , C 5 -C 12  cycloalkyl which is unsubstituted or substituted by —OH, straight chain or branched C 2 -C 18 alkenyl which is unsubstituted or substituted by —OH, C 7 -C 15 aralkyl, —CH 2 —CHOH—R 13  or glycidyl,    R 6  is hydrogen, straight or branched chain C 1 -C 24 alkyl which is unsubstituted or substituted by one or more OH, OR 4  or NH 2  groups, or —OR 6  is —(OCH 2 CH 2 ) w OH or —(OCH 2 CH 2 ) w OR 21  where w is 1 to 12 and R 21  is alkyl of 1 to 12 carbon atoms,    R 7  and R 8  are independently hydrogen, alkyl of 1 to 18 carbon atoms, straight or branched chain C 3 -C 18 alkyl which is interrupted by —O—, —S— or —NR 11 —, C 5 -C 12 cycloalkyl, C 6 -C 14 aryl or C 1 -C 3 hydroxylalkyl, or R 7  and R 8  together with the N atom are a pyrrolidine, piperidine, piperazine or morpholine ring,    when n is 2, R 5  is one of divalent radicals —O—R 9 —O— or —N(R 11 )—R 10 —N(R 11 )—,    R 9  is C 2 -C 8 alkylene, C 4 -C 8 alkenylene, C 4 alkynylene, cyclohexylene, straight or branched chain C 4 -C 10 alkylene which is interrupted by —O— or by —CH 2 —CHOH—CH 2 —O—R 14 —O—CH 2 —CHOH—CH 2 —,    R 10  being straight or branched chain C 2 -C 12 alkylene which may be interrupted by —O—, cyclohexylene, or  
                 
   or R 10  and R 11  with the two nitrogen atoms form a piperazine ring,    R 14  is straight or branched chain C 2 -C 8 alkylene, straight or branched chain C 4 -C 10 alkylene which is interrupted by —O—, cycloalkylene, arylene or  
                 
   where R 7  and R 8  are independently hydrogen, alkyl of 1 to 18 carbon atoms or R 7  and R 8  together are alkylene of 4 to 6 carbon atoms, 3-oxapentamethylene, 3-iminopentamethylene or 3-methyliminopentamethylene,    R 11  is hydrogen, straight or branched chain C 1 -C 18 alkyl, C 5 -C 12 cycloalkyl, straight or branched chain C 3 -C 8 alkenyl, C 6 -C 14 aryl or C 7 -C 15 aralkyl,    R 12  is straight or branched chain C 1 -C 18 alkyl, straight or branched chain C 3 -C 18 alkenyl, C 5 -C 10 cycloalkyl, C 6 -C 16 aryl or C 7 -C 15 aralkyl,    R 13  is H, straight chain or branched C 1 -C 18 alkyl which is substituted by —PO(OR 12 ) 2 , phenyl which is unsubstituted or substituted by OH, C 7 -C 15 aralkyl or —CH 2 OR 12 ,    R 3  is alkyl of 1 to 20 carbon atoms, hydroxyalkyl of 2 to 20 carbon atoms, alkenyl of 3 to 18 carbon atoms, cycloalkyl of 5 to 12 carbon atoms, phenylalkyl of 7 to 15 carbon atoms, aryl of 6 to 10 carbon atoms or said aryl substituted by one or two alkyl of 1 to 4 carbon atoms or 1,1,2,2-tetrahydroperfluoroalkyl where the perfluoroalkyl moiety is of 6 to 16 carbon atoms,    L is alkylene of 1 to 12 carbon atoms, alkylidene of 2 to 12 carbon atoms, benzylidene, p-xylylene or cycloalkylidene, and    T is —SO—, —SO 2 —, —SO—E—SO—, —SO 2 —E—SO 2 —, —CO—, —CO—E—CO—, —COO—E—OCO—, —CO—NG 3 —E—NG 3 —CO— or —NG 3 —CO—E—CO—NG 3 —,    where E is alkylene of 2 to 12 carbon atoms, cycloalkylene of 5 to 12 carbon atoms, or alkylene interrupted or terminated by cyclohexylene of 8 to 12 carbon atoms, which benzotriazole exhibits enhanced durability and low loss rate values when the coating is exposed to actinic radiation as witnessed by a loss of less than 0.22 absorbance units after exposure for 1200 hours, or less than 0.27 absorbance units after 1500 hours exposure, or less than 0.40 absorbance units after 2500 hours exposure in a Xenon-Arc Weather-Ometer.    
     
     
         2 . A composition according to    claim 1    wherein component (b) is a compound of formula A′  
                 
 
       wherein 
 G 2  is fluoro, chloro, cyano, R 3 SO 2 —, CF 3 —, —CO—G 3 , —COO—G 3  or —CO—N(G 3 ) 2    
 G 3  is alkyl of 1 to 12 carbon atoms,  
 R 1  is hydrogen, alkyl of 1 to 12 carbon atoms, phenyl, phenylalkyl of 7 to 15 carbon atoms or said phenyl or said phenylalkyl substituted on the phenyl ring by 1 or 2 alkyl groups of 1 to 4 carbon atoms,  
 R 2  is alkyl of 1 to 12 carbon atoms, phenyl, phenylalkyl of 7 to 15 carbon atoms or —CH 2 CH 2 COOG 4  where G 4  is hydrogen, alkyl of 1 to 24 carbon atoms or said alkyl substituted by OH, interrupted by one to six —O— atoms or both substituted by OH and interrupted by one to six —O— atoms, and  
 R 3  is alkyl of 1 to 18 carbon atom, aryl of 6 to 10 carbon atoms or said aryl substituted one or two alkyl of 1 to 4 carbon atoms.  
 
     
     
         3 . A composition according to    claim 2    where in the compound of formula A′ 
 G 2  is fluoro, chloro, cyano, R 3 SO 2 —, CF 3 —, —COO—G 3  or —CO—N(G 3 ) 2 ,  
 G 3  is alkyl of 1 to 8 carbon atoms,  
 R 1  is hydrogen, phenyl or α-cumyl,  
 R 2  is alkyl of 4 to 12 carbon atoms or phenyl, and  
 R 3  is phenyl or alkyl of 8 to 12 carbon atoms.  
 
     
     
         4 . A composition according to    claim 3    wherein 
 G 2  is phenyl-SO 2 —, octyl-SO 2 —, fluoro or CF 3 —,  
 R 1  is α-cumyl or phenyl, and  
 R 2  is tert-butyl or tert-octyl.  
 
     
     
         5 . A composition according to    claim 1    wherein component (a) is a resin which is a thermoset acrylic melamine resin or an acrylic urethane resin.  
     
     
         6 . A composition according to    claim 1    which additionally contains a stabilizing amount of a phenolic antioxidant selected from the group consisting of n-octadecyl 3,5-di-tert-butyl-4-hydroxyhydrocinnamate, neopentanetetrayl tetrakis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate), di-n-octadecyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate, 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanurate, thiodiethylene bis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate), 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, 3,6-dioxaoctamethylene bis(3-methyl-5-tert-butyl-4-hydroxyhydrocinnamate), 2,6-di-tert-butyl-p-cresol, 2,2′-ethylidene-bis(4,6-di-tert-butylphenol), 1,3,5-tris(2,6-dimethyl-4-tert-butyl-3-hydroxybenzyl)isocyanurate, 1,1,3,-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane, 1,3,5-tris[2-(3,5-di-tert-butyl-4-hydroxyhydrocinnamoyloxy)ethyl]isocyanurate, 3,5-di-(3,5-di-tert-butyl-4-hydroxybenzyl)mesitol, hexamethylene bis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate), 1-(3,5-di-tert-butyl-4-hydroxyanilino)-3,5-di(octylthio)-s-triazine, N,N′-hexamethylene-bis(3,5-di-tert-butyl-4-hydroxyhydrocinnamamide), calcium bis(ethyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate), ethylene bis[3,3-di(3-tert-butyl-4-hydroxyphenyl)butyrate], octyl 3,5-di-tert-butyl-4-hydroxybenzylmercaptoacetate, bis(3,5-di-tert-butyl-4-hydroxyhydrocinnamoyl)hydrazide, and N,N′-bis[2-(3,5-di-tert-butyl-4-hydroxyhydrocinnamoyloxy)-ethyl]-oxamide.  
     
     
         7 . A composition according to    claim 6    wherein the phenolic antioxidant is neopentanetetrayl tetrakis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate), n-octadecyl 3,5-di-tert-butyl-4-hydroxyhydrocinnamate, 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanurate, 2,6-di-tert-butyl-p-cresol or 2,2′-ethylidene-bis(4,6-di-tert-butylphenol).  
     
     
         8 . A composition according to    claim 1    which additionally contains an effective stabilizing amount of a hindered amine selected from the group consisting of bis(2,2,6,6-tetramethylpiperidin-4-yl) sebacate, bis(1,2,2,6,6-pentamethylpiperidin-4-yl) sebacate, di(1,2,2,6,6-pentamethylpiperidin-4-yl) (3,5-di-tert-butyl-4-hydroxybenzyl)butylmalonate, 4-benzoyl-2,2,6,6-tetramethylpiperidine, 4-stearyloxy-2,2,6,6-tetramethylpiperidine, 3-n-octyl-7,7,9,9-tetramethyl-1,3,8-triaza-spiro[4.5]decane-2,4-dione, tris(2,2,6,6-tetramethylpiperidin-4-yl) nitrilotriacetate, 1,2-bis(2,2,6,6-tetramethyl-3-oxopiperazin-4-yl)ethane, 2,2,4,4-tetramethyl-7-oxa-3,20-diaza-21-oxodispiro[5.1.11.2] heneicosane, polycondensation product of 2,4-dichloro-6-tert-octylamino-s-triazine and 4,4′-hexamethylenebis(amino-2,2,6,6-tetramethylpiperidine), polycondensation product of 1-(2-hydroxyethyl)-2,2,6,6-tetramethyl-4-hydroxypiperidine and succinic acid, polycondensation product of 4,4′-hexamethylenebis-(amino-2,2,6,6-tetramethylpiperidine) and 1,2-dibromoethane, tetrakis(2,2,6,6-tetramethylpiperidin-4-yl) 1,2,3,4-butanetetracarboxylate, tetrakis(1,2,2,6,6-pentamethylpiperidin-4-yl) 1,2,3,4-butanetetracarboxylate, polycondensation product of 2,4-dichloro-6-morpholino-s-triazine and 4,4′-hexamethylenebis(amino-2,2,6,6-tetramethylpiperidine), N,N′,N″,N′″-tetrakis[(4,6-bis(butyl-1,2,2,6,6-pentamethyl-piperidin-4-yl)-amino-s-triazin-2-yl]-1,10-diamino-4,7-diazadecane, mixed [2,2,6,6-tetramethylpiperidin-4-yl/β,β,β′,β′-tetramethyl-3,9-(2,4,8,10-tetraoxaspiro[5.5]-undecane) diethyl]1,2,3,4-butanetetracarboxylate, mixed [1,2,2,6,6-pentamethylpiperidin-4-yl/β,β,β′,β′-tetramethyl-3,9-(2,4,8,10-tetraoxaspiro[5.5]-undecane)diethyl] 1,2,3,4-butanetetracarboxylate, octamethylene bis(2,2,6,6-tetramethylpiperidin-4-carboxylate), 4,4′-ethylenebis(2,2,6,6-tetramethylpiperazin-3-one), N-2,2,6,6-tetramethylpiperidin-4-yl-n-dodecylsuccinimide, N-1,2,2,6,6-pentamethylpiperidin-4-yl-n-dodecylsuccinimide, N-1-acetyl-2,2,6,6-tetramethylpiperidin-4-yln-dodecylsuccinimide, 1-acetyl3-dodecyl-7,7,9,9-tetramethyl-1,3,8-triazaspiro[4.5]decane-2,4-dione, di-(1-octyloxy-2,2,6,6-tetramethylpiperidin-4-yl) sebacate, di-(1-cyclohexyloxy-2,2,6,6-tetramethylpiperidin-4-yl) succinate, 1-octyloxy-2,2,6,6-tetramethyl-4-hydroxy-piperidine, poly- {[6-tert-octylamino-s-triazin-2,4-diyl][2-(1-cyclohexyloxy-2,2,6,6-tetramethylpiperidin-4-yl)imino-hexamethylene-[ 4-(1-cyclohexyloxy-2,2,6,6-tetramethylpiperidin-4-yl)imino], and 2,4,6-tris[N-(1-cyclohexyloxy-2,2,6,6-tetramethylpiperidin-4-yl)-n-butylamino]-s-triazine.  
     
     
         9 . A composition according to    claim 8    wherein the hindered amine is bis(2,2,6,6-tetramethylpiperidin-4-yl) sebacate, bis(1,2,2,6,6-pentamethylpiperidin-4-yl) sebacate, di(1,2,2,6,6-pentamethylpiperidin-4-yl) (3,5-di-tert-butyl-4-hydroxybenzyl)butylmalonate, the polycondensation product of 1-(2-hydroxyethyl)-2,2,6,6-tetramethyl-4-hydroxypiperidine and succinic acid, the polycondensation product of 2,4-dichloro-6-tert-octylamino-s-triazine and 4,4′-hexamethylenebis(amino-2,2,6,6-tetramethylpiperidine), N,N′,N″,N′″-tetrakis[ (4,6-bis(butyl-(1,2,2,6,6-pentamethyl-piperidin-4-yl)amino)-s-triazine-2-yl]-1,10-diamino-4,7-diazadecane, di-(1-octyloxy-2,2,6,6-tetramethylpiperidin-4-yl) sebacate, di-(1-cyclohexyloxy-2,2,6,6-tetramethylpiperidin-4-yl) succinate, 1-octyloxy-2,2,6,6-tetramethyl-4-hydroxy-piperidine, poly-{[6-tert-octylamino-s-triazin-2,4-diyl][2-(1-cyclohexyloxy-2,2,6,6-tetramethylpiperidin-4-yl)imino-hexamethylene-[4-(1-cyclohexyloxy-2,2,6,6-tetramethylpiperidin-4-yl)imino], or 2,4,6-tris[N-(1-cyclohexyloxy-2,2,6,6-tetramethylpiperidin-4-yl)-n-butylamino]-s-triazine.  
     
     
         10 . A composition according to    claim 1    which additionally contains another UV absorber selected from the group consisting of the s-triazines, the oxanilides, the hydroxybenzophenones, benzoates and the α-cyanoacrylates.  
     
     
         11 . A composition according to    claim 10    wherein the composition additionally contains an s-triazine which is 
 2,4-bis(2,4-dimethylphenyl)-6-(2-hydroxy-4-octyloxyphenyl)-s-triazine;  
 2,4-diphenyl-6-(2-hydroxy-4-hexyloxyphenyl)-s-triazine;  
 2,4-bis(2,4-dimethylphenyl)-6-[2-hydroxy-4-(3-do-/tri-decyloxy-2-hydroxypropoxy)-phenyl] -s-triazine; or  
 2-(2-hydroxyethylamino)-4,6-bis [N-butyl-N-(1-cyclohexyloxy-2,2,6,6-tetramethylpiperidin-4-yl)amino]-s-triazine.  
 
     
     
         12 . A compound of formula I, II, III or IV  
                   
       wherein 
 G 1  is hydrogen or halogen,  
 G 2  is cyano, E 3 SO—, E 3 SO 2 —, —COOG 3 , CF 3 —, —P(O)(C 6 H 5 ) 2 , —CO—G 3 , —CO—NHG 3  or —CO—N(G 3 ) 2 ,  
 G 3  is straight or branched chain alkyl of 1 to 24 carbon atoms, straight or branched chain alkenyl of 2 to 18 carbon atoms, cycloalkyl of 5 to 12 carbon atoms, phenylalkyl of 7 to 15 carbon atoms, phenyl, or said phenyl or said phenylalkyl substituted on the phenyl ring by 1 to 4 alkyl of 1 to 4 carbon atoms,  
 E 1  is hydrogen, phenylalkyl of 7 to 15 carbon atoms, phenyl, or said phenyl or said phenylalkyl substituted on the phenyl ring by 1 to 4 alkyl of 1 to 4 carbon atoms,  
 E 2  is straight or branched alkyl chain of 1 to 24 carbon atoms, straight or branched chain alkenyl of 2 to 18 carbon atoms, cycloalkyl of 5 to 12 carbon atoms, phenylalkyl of 7 to 15 carbon atoms, phenyl, or said phenyl or said phenylalkyl substituted on the phenyl ring by 1 to 3 alkyl of 1 to 4 carbon atoms; or E 2  is hydroxyl or —OE 4  where E 4  is straight or branched chain alkyl of 1 to 24 carbon atoms; or said alkyl substituted by one or more —OH, —OCO—E 11 , —OE 4 , —NCO or —NH 2  groups or mixtures thereof; or said alkyl or said alkenyl interrupted by one or more —O—, —NH— or —NE 4 — groups or mixtures thereof and which can be unsubstituted or substituted by one or more —OH, —OE 4  or —NH 2  groups or mixtures thereof; or E 2  is —SE 3 , —NHE 3  or —N(E 3 ) 2 ; or E 2  is  
 (CH 2 ) m —CO—X—(Z) p —Y—E 15    
 wherein  
 X is —O— or —N(E 16 )—,  
 Y is —O— or —N(E 17 )—,  
 Z is C 2 -C 12 -alkylene, C 4 -C 12 -alkylene interrupted by one to three nitrogen atoms, oxygen atoms or a mixture thereof, or is C 3 -C 12 -alkylene, butenylene, butynylene, cyclohexylene or phenylene, each substituted by a hydroxyl group,  
 m is zero, 1 or 2,  
 p is 1, or p is also zero when X and Y are —N(E 16 )— and —N(E 17 )—, respectively,  
 E 15  is a group —CO—C(E 18 )═C(H)E 19  or, when Y is —N(E 17 )—, forms together with E 17  a group —CO—CH═CH—CO—, wherein E 18  is hydrogen or methyl, and E 19  is hydrogen, methyl or —CO—X—E 20 , wherein E 20  is hydrogen, C 1 -C 12 -alkyl or a group of the formula.  
                 
 
 wherein the symbols E 1 , G 2 , X, Z, m and p have the meanings defined above, and E 16  and E 17  independently of one another are hydrogen, C 1 -C 12 -alkyl, C 3 -C 12 -alkyl interrupted by 1 to 3 oxygen atoms, or is cyclohexyl or C 7 -C 15 aralkyl, and E 16  together with E 17  in the case where Z is ethylene, also forms ethylene,  
 n is 1 or 2,  
 when n is 1, E 5  is Cl, OE 6  or NE 7 E 8 , or  
 E 5  is —PO(OE 12 ) 2 , —OSi(E 11 ) 3  or —OCO—E 11 , or straight or branched chain C 1 -C 24 alkyl which is interrupted by —O—, —S— or —NE 11  and which can be unsubstituted or substituted by —OH or —OCO—E 11 , C 5 -C 12  cycloalkyl which is unsubstituted or substituted by —OH, straight chain or branched C 2 -C 18 alkenyl which is unsubstituted or substituted by —OH, C 7 -C 15 aralkyl, —CH 2 —CHOH—E 13  or glycidyl,  
 E 6  is hydrogen, straight or branched chain C 1 -C 24 alkyl which is unsubstituted or substituted by one or more OH, OE 4  or NH 2  groups, or —OE 6  is —(OCH 2 CH 2 ) w OH or —(OCH 2 CH 2 ) w OE 21  where w is 1 to 12 and E 21  is alkyl of 1 to 12 carbon atoms,  
 E 7  and E 8  are independently hydrogen, alkyl of 1 to 18 carbon atoms, straight or branched chain C 3 -C 18 alkyl which is interrupted by —O—, —S— or —NE 11 —, C 5 -C 12 cycloalkyl, C 6 -C 14 aryl or C 1 -C 3 hydroxylalkyl, or E 7  and E 8  together with the N atom are a pyrrolidine, piperidine, piperazine or morpholine ring,  
 when n is 2, E 5  is one of divalent radicals —O—E 9 —O— or —N(R 11 )—E 10 —N(E 11 )—,  
 E 9  is C 2 -C 8 alkylene, C 4 -C 8 alkenylene, C 4 alkynylene, cyclohexylene, straight or branched chain C 4 -C 10 alkylene which is interrupted by —O— or by —CH 2 —CHOH—CH 2 —O—E 14 —O—CH 2 —CHOH—CH 2 —,  
 E 10  being straight or branched chain C 2 -C 12 alkylene which may be interrupted by —O—, cyclohexylene, or  
                 
 
 or E 10  and E 11  with the two nitrogen atoms form a piperazine ring,  
 E 14  is straight or branched chain C 2 -C 8 alkylene, straight or branched chain C 4 -C 10 alkylene which is interrupted by —O—, cycloalkylene, arylene or  
                 
 
 where E 7  and E 8  are independently hydrogen, alkyl of 1 to 18 carbon atoms or E 7  and E 8  together are alkylene of 4 to 6 carbon atoms, 3-oxapentamethylene, 3-iminopentamethylene or 3-methyliminopentamethylene,  
 E 11  is hydrogen, straight or branched chain C 1 -C 18 alkyl, C 5 -C 12 cycloalkyl, straight or branched chain C 3 -C 8 alkenyl, C 6 -C 14 aryl or C 7 -C 15 aralkyl,  
 E 12  is straight or branched chain C 1 -C 18 alkyl, straight or branched chain C 3 -C 18 alkenyl, C 5 -C 10 cycloalkyl, C 6 -C 16 aryl or C 7 -C 15 aralkyl,  
 E 13  is H, straight chain or branched C 1 -C 18 alkyl which is substituted by —PO(OR 12 ) 2 , phenyl which is unsubstituted or substituted by OH, C 7 -C 15 aralkyl or —CH 2 OE 12 ,  
 E 3  is alkyl of 1 to 20 carbon atoms, hydroxyalkyl of 2 to 20 carbon atoms, alkenyl of 3 to 18 carbon atoms, cycloalkyl of 5 to 12 carbon atoms, phenylalkyl of 7 to 15 carbon atoms, aryl of 6 to 10 carbon atoms or said aryl substituted by one or two alkyl of 1 to 4 carbon atoms or 1,1,2,2-tetrahydroperfluoroalkyl where the perfluoroalkyl moiety is of 6 to 16 carbon atoms,  
 L is alkylene of 1 to 12 carbon atoms, alkylidene of 2 to 12 carbon atoms, benzylidene, p-xylylene or cycloalkylidene, and  
 T is —SO—, —SO 2 —, —SO—E—SO—, —SO 2 —E—SO 2 —, —CO—, —CO—E—CO—, —COO—E—OCO— or —CO—NG 5 —E—NG 5 —CO—,  
 where E is alkylene of 2 to 12 carbon atoms, cycloalkylene of 5 to 12 carbon atoms, or alkylene interrupted or terminated by cyclohexylene of 8 to 12 carbon atoms;  
 G 5  is G 3  or hydrogen, and  
 with the proviso that E 1  is not phenylalkyl when G 2  is E 3 SO— or E 3 SO 2 —.  
 
     
     
         13 . A compound according to    claim 12    which is a compound of formula I′  
                 
 
       wherein 
 G 2  is cyano, E 3 SO 2 —, CF 3 —, —COO—G 3 —CO—NHG 3  or —CO—N(G 3 ) 2 ,  
 G 3  is alkyl of 1 to 12 carbon atoms,  
 E 1  is hydrogen, phenyl, phenylalkyl of 7 to 15 carbon atoms or said phenyl or said phenylalkyl substituted on the phenyl ring by 1 or 2 alkyl groups of 1 to 4 carbon atoms,  
 E 2  is alkyl of 1 to 12 carbon atoms, phenyl, phenylalkyl of 7 to 15 carbon atoms or —CH 2 CH 2 COOG 4  where G 4  is hydrogen, alkyl of 1 to 24 carbon atoms or said alkyl substituted by OH, interrupted by one to six —O— atoms or both substituted by OH and interrupted by one to six —O— atoms,  
 E 3  is alkyl of 8 to 18 carbon atom, aryl of 6 to 10 carbon atoms or said aryl substituted one or two alkyl of 1 to 4 carbon atoms, and  
 with the proviso that E 1  is not phenylalkyl when G 2  is E 3 SO— or E 3 SO 2 —.  
 
     
     
         14 . A compound according to    claim 13    wherein 
 G 2  is cyano, E 3 SO 2 —, CF 3 —, —CO—G 3  or —CO—N(G 3 ) 2 ,  
 G 3  is alkyl of 1 to 8 carbon atoms,  
 E 1  is hydrogen, phenyl or α-cumyl,  
 E 2  is alkyl of 4 to 12 carbon atoms, and  
 E 3  is phenyl or octyl, and  
 with the proviso that E 1  is not α-cumyl when G 2  is E 3 SO 2 —.  
 
     
     
         15 . A compound according to    claim 14    wherein 
 G 2  is CF 3 —,  
 E 1  is α-cumyl, and  
 E 2  is tert-butyl or tert-octyl.  
 
     
     
         16 . A composition stabilized against thermal, oxidative or light-induced degradation which comprises, 
 (a) an organic material subject to thermal, oxidative or light-induced degradation, and    (b) an effective stabilizing amount of a compound of formula I, II, III or IV according to    claim 12   .    
     
     
         17 . A composition according to    claim 16    wherein the organic material is a natural, semi-synthetic or synthetic polymer.  
     
     
         18 . A composition according to    claim 17    wherein the polymer is a thermoplastic polymer.  
     
     
         19 . A composition according to    claim 18    wherein the polymer is is a polyolefin or polycarbonate.  
     
     
         20 . A composition according to    claim 19    wherein the polymer is polyethylene or polypropylene.  
     
     
         21 . A composition according to    claim 20    wherein the polymer is polypropylene.  
     
     
         22 . A composition according to    claim 16    wherein the organic material is a resin selected from the group consisting of a thermoset acrylic melamine resin, an acrylic urethane resin, an epoxy carboxy resin, a silane modified acrylic melamine, an acrylic resin with carbamate pendant groups crosslinked with melamine or an acrylic polyol resin crosslinked with melamine containing carbamate groups.  
     
     
         23 . A composition according to    claim 22    wherein the resin is a thermoset acrylic melamine resin or an acrylic urethane resin.  
     
     
         24 . A composition according to    claim 16    wherein the organic material is a recording material.