Stabilized Polyolefin Compositions Comprising Benzofuranones and Hindered Amine Light Stabilizers

Abstract

Polyolefin compositions comprising i) a polyolefin, ii) one or more phosphorus- containing benzofuranone compounds and iii) one or more hindered amine light stabilizers are provided excellent protection against discoloration and enhanced thermal stability during melt processing as exhibited by improved retention of molecular weight and maintenance of polymer molecular architecture.

I/We claim: 
     
         1 - 20 . (canceled) 
     
     
         21 . A composition comprising
 i) a polyolefin,   ii) one or more benzofuranone compounds comprising a compound of at least one of formula: I-p1, I-o1 or I-m1:   
       
         
           
           
               
               
           
         
       
       wherein X is P or P═O;
 Y p , Y o  and Y m  independently is oxygen or a covalent bond, 
 when Y p , Y o  or Y m  is oxygen,
 R Ip  represents one of subformulae II-p, II-o or II-m 
 
 
       
         
           
           
               
               
           
         
         R 1o  represents one of subformulae II-o or II-m, 
         R 1m  represents subformula II-m, or 
         R 1p  together with R 2p , R 1o  together with R 2o  or R 1m  together with R 2m  represent one of subformulae III, IV or V 
       
       
         
           
           
               
               
           
         
       
       or
 R 1p , R 1o  or R 1m  is C 6 -C 10 -aryl, which is unsubstituted or substituted by C 1 -C 8 -alkyl, C 1 -C 8 -alkoxy, halogen or one phenyl, C 1 -C 18 -alkyl, C 3 -C 16 -cycloalkyl, C 7 -C 13 -aralkyl, C 2 -C 18 -alkenyl, C 2 -C 30 -alkyl, which is interrupted by one or more oxygen atoms, or C 2 -C 16 -alkyl, which is interrupted by one sulfur atom, 
 R 2p  represents one of subformulae II-p, II-o or II-m, 
 R 2o  represents one of subformulae II-o or II-m, 
 R 2m  represents subformula II-m, or 
 R 2p  together with R lp , R 2o  together with R 1o  or R 2m  together with R 1m  represent one of subformulae III, IV or V, or 
 R 2p , R 2o  or R 2m  is C 6 -C 10 -aryl, which is unsubstituted or substituted by C 1 -C 8 -alkyl, C 1 -C 8 -alkoxy, halogen or one phenyl, C 1 -C 18 -alkyl, C 3 -C 16 -cycloalkyl, C 7 -C 13 -aralkyl, C 2 -C 18 -alkenyl, C 2 -C 30 -alkyl, which is interrupted by one or more oxygen atoms, or C 2 -C 16 -alkyl, which is interrupted by one sulfur atom, or 
 
       when Y p , Y 2o  or Y m  in is a covalent bond,
 R 1p  represents one of subformulae II-p, II-o or II-m, 
 R 1o  represents one of subformulae II-o or II-m, 
 R 1m  represents subformula II-m, or 
 R 1p , R 1o  or R 1m  is C 6 -C 10 -aryl, which is unsubstituted or substituted by C 1 i-C 8 -alkyl, C 1 -C 8 -alkoxy, halogen or one phenyl, C 1 -C 18 -alkyl, C 3 -C 16 -cycloalkyl, C 7 -C 13 -aralkyl, C 2 -C 18 -alkenyl, C 2 -C 30 -alkyl, which is interrupted by one or more oxygen atoms, or C 2 -C 16 -alkyl, which is interrupted by one sulfur atom, 
 R 2p , R 2o  or R 2m  is C 6 -C 10 -aryl, which is unsubstituted or substituted by C 1 -C 8 -alkyl, C 1 -C 8 -alkoxy, halogen or one phenyl, or halogen; 
 R 4 , R 5 , R 6  and R 7  are each independently hydrogen or C 1 -C 8 -alkyl, 
   p2 , R p3 , R p5  and R p6  are each independently hydrogen or C 1 -C 8 -alkyl, 
 R ol , R o2 , R o5  and R o6  are each independently hydrogen or C 1 -C 8 -alkyl, 
 R ml , R m3 , R m5  and R m6  are each independently hydrogen or C 1 -C 8 -alkyl, 
 R a1 , R a2 , R a3  and R a4  are each independently hydrogen or C 1 -C 8 -alkyl, 
 R b1 , R b2 , R b3 , R b4 , R b5  and R b6  are each independently hydrogen or C 1 -C 8 -alkyl and 
 R c1 , R c2 , R c3  and R c4  are each independently hydrogen or C 1 -C 8 -alkyl; and 
 
       iii) one or more hindered amine light stabilizers. 
     
     
         22 . The composition according to claim  1 , wherein the polyolefin comprises polypropylene. 
     
     
         23 . The composition according to claim  1 , wherein the polyolefin comprises polyethylene. 
     
     
         24 . The composition according to claim  1 , wherein the hindered amine light stabilizers are selected from the group consisting of:
 (1) 1-cyclohexyloxy-2,2,6,6-tetramethyl-4-octadecylaminopiperi dine,   (2) bis(2,2,6,6-tetramethylpiperidin-4-yl) sebacate,   (3) bis(1-acetoxy-2,2,6,6-tetramethylpiperidin-4-yl) sebacate,   (4) bis(1,2,2,6,6-pentamethylpiperidin-4-yl) sebacate,   (5) bis(1-cyclohexyloxy-2,2,6,6-tetramethylpiperidin-4-yl) sebacate,   (6) bis(1-octyloxy-2,2,6,6-tetramethylpiperidin-4-yl) sebacate;   (7) bis(1-acyl-2,2,6,6-tetramethylpiperidin-4-yl) sebacate,   (8) bis(1,2,2,6,6-pentamethyl-4-piperidyl) n-butyl-3,5-di-tert-butyl-4-hydroxybenzylmalonate   (9) 2,4-bis[(1-cyclohexyloxy-2,2,6,6-tetramethylpiperidin-4-yl)butylamino]-6-(2-hydroxy-ethyl amino-s-triazine,   (10) bis(1-cyclohexyloxy-2,2,6,6-tetramethylpiperidin-4-yl) adipate,   (11) 2,4-bis[(1-cyclohexyloxy-2,2,6,6-piperidin-4-yl)butylamino]-6-chloro-s-triazine,   (12) 1-(2-hydroxy-2-methylpropoxy)-4-hydroxy-2,2,6,6-tetramethylpiperidine,   (13) 1-(2-hydroxy-2-methylpropoxy)-4-oxo-2,2,6,6-tetramethylpiperidine,   (14) 1-(2-hydroxy-2-methylpropoxy)-4-octadecanoyloxy-2,2,6,6-tetramethylpiperidine,   (15) bis(1-(2-hydroxy-2-methylpropoxy)-2,2,6,6-tetramethylpiperidin-4-yl) sebacate,   (16) bis(1-(2-hydroxy-2-methylpropoxy)-2,2,6,6-tetramethylpiperidin-4-yl) adipate,   (17) 2,4-bis{N-[1-(2-hydroxy-2-methylpropoxy)-2,2,6,6-tetramethylpiperidin-4-yl]-N-butyl-amino}-6-(2-hydroxyethylamino)-s- triazine,   (18) 4-benzoyl-2,2,6,6-tetramethylpiperidine,   (19) di-(1,2,2,6,6-pentamethylpiperidin-4-yl) p-methoxybenzylidenemalonate,   (20) 2,2,6,6-tetramethylpiperidin-4-yl octadecanoate,   (21) bis(1-octyloxy-2,2,6,6-tetramethylpiperidyl) succinate,   (22) 1,2,2,6,6-pentamethyl-4-aminopiperidine,   (23) 2-undecyl-7,7,9,9-tetramethyl-1-oxa-3,8-diaza-4-oxo-spiro[4,5]decane,   (24) tris(2,2,6,6-tetramethyl-4-piperidyl) nitrilotriacetate,   (25) tris(2-hydroxy-3-(amino-(2,2,6,6-tetramethylpiperidin-4-yl)propyl) nitrilotriacetate,   (26) tetrakis(2,2,6,6-tetramethyl-4-piperidyl)-1,2,3,4-butane-tetracarboxylate,   (27) tetrakis(1,2,2,6,6-pentamethyl-4-piperidyl)-1,2,3,4-butane-tetracarboxylate,   (28) 1,1′-(1,2-ethanediyl)-bis(3,3,5,5-tetramethylpiperazinone),   (29) 3-n-octyl-7,7,9,9-tetramethyl-1,3,8-triazaspiro[4.5]decan-2,4-dione,   (30) 8-acetyl-3-dodecyl-7,7,9,9-tetramethyl-1,3,8-triazaspiro[4.5]decane-2,4-dione,   (31) 3 -dodecyl-1-(2,2,6,6-tetram ethyl-4-piperidyl)pyrrolidin-2,5-dione,   (32) 3-dodecyl-1-(1,2,2,6,6-pentamethyl-4-piperidyl)pyrrolidine-2,5-dione,   (33) N,N′-bis-formyl-N,N′-bis(2,2,6,6-tetramethyl-4-piperidyl)hexamethylenediamine,   (33a) bis(1-undecanyloxy-2,2,6,6-tetramethylpiperidin-4-yl)carbonate,   (34) reaction product of 2,4-bis[(1-cyclohexyloxy-2,2,6,6-piperidin-4-yl)butylamino]-6-chloro-s-triazine with N,N′-bis(3- aminopropyl)ethylenediamine),   (35) condensate of 1-(2-hydroxyethyl)-2,2,6,6-tetramethyl-4-hydroxypiperidine and succinic acid,   (36) condensate of N,N′-bis(2,2,6,6-tetramethyl-4-piperidyl)-hexamethylenediamine and 4-tert-octylamino-2,6-dichloro-1,3,5-triazine,   (37) condensate of N,N′-bis(2,2,6,6-tetramethyl-4-piperidyl)-hexamethylenediamine and 4-cyclohexylamino-2,6-dichloro-1,3,5-triazine,   (38) condensate of N,N′-bis-(2,2,6,6-tetramethyl-4-piperidyl)hexamethylenediamine and 4-morpholino-2,6-dichloro-1,3,5-triazine,   (39) condensate of N,N′-bis-(1,2,2,6,6-pentamethyl-4-piperidyl)hexamethylenediamine and 4-morpholino-2,6-dichloro-1,3,5-triazine,   (40) condensate of 2-chloro-4,6-bis(4-n-butylamino-2,2,6,6-tetramethylpiperidyl)-1,3,5-triazine and 1,2-bis(3-aminopropylamino)ethane,   (41) condensate of 2-chloro-4,6-di-(4-n-butylamino-1,2,2,6,6-pentamethylpiperidyl)-1,3,5-triazine and 1,2-bis-(3-aminopropylamino)ethane,   (42) a reaction product of 7,7,9,9-tetramethyl-2-cycloundecyl-1-oxa-3,8-diaza-4-oxospiro [4,5]decane and epichlorohydrin,   (43) poly[methyl,(3-oxy-(2,2,6,6-tetramethylpiperidin-4-yl)propyl)] siloxane, CAS#182635-99-0,   (44) reaction product of maleic acid anhydride-C18-C22-□-olefin-copolymer with 2,2,6,6-tetramethyl-4-aminopiperidine,   (45) oligomeric condensate of 4,4′-hexamethylenebis(amino-2,2,6,6-tetramethylpiperidine) and 2,4-dichloro-6-[(2,2,6,6-tetramethylpiperidin-4-yl)butylamino]-s-triazine end-capped with 2-chloro-4,6-bis(dibutylamino)-s-triazine,   (46) oligomeric condensate of 4,4′-hexamethylenebis(amino-1,2,2,6,6-pentaamethyl-piperidine) and 2,4-dichloro-6-[(1,2,2,6,6-pentaamethylpiperidin-4-yl)butylamino]-s-triazine end-capped with 2-chloro-4,6-bis(dibutylamino)-s-triazine,   (47) oligomeric condensate of 4,4′-hexamethylenebis(amino-1-propoxy-2,2,6,6-tetramethyl piperidine) and 2,4-dichloro-6-[(1-propoxy-2,2,6,6-tetramethylpiperidin-4-yl)butyl-amino]-s-triazine end-capped with 2-chloro-4,6-bis(dibutylamino)-s-triazine,   (48) oligomeric condensate of 4,4′-hexamethylenebis(amino-1-acyloxy-2,2,6,6-tetramethyl piperidine) and 2,4-dichloro-6-[(1-acyloxy-2,2,6,6-tetramethylpiperidin-4-yl)butyl-amino]-s-triazine end-capped with 2-chloro-4,6-bis(dibutylamino)-s-triazine   (49) product obtained by reacting (a) with (b) where (a) is product obtained by reacting 1,2-bis(3-aminopropylamino)ethane with cyanuric chloride and (b) is (2,2,6,6-tetramethyl piperidin-4-yl)butylamine,   (50) (4-piperidinol, 2,2,6,6-tetramethyl-1-(undecyloxy))-, 4,4′-carbonate and   (51) 1,3,5-triazine-2,4,6-triamine, N2,N2′-1,6-hexanediylbis[N4,N6-dibutyl-N2,N4,N6-tris(2,2,6,6-tetramethyl-4-piperidinyl)-, N-propoxy.   
     
     
       25. The composition according to  claim 1 , wherein the one or more hindered amine light stabilizers are selected from the group consisting of:
 (2) bis(2,2,6,6-tetramethylpiperidin-4-yl) sebacate, 
 (20) 2,2,6,6-tetramethylpiperidin-4-yl octadecanoate, 
 (14) 1-(2-hydroxy-2-methylpropoxy)-4-octadecanoyloxy-2,2,6,6-tetramethylpiperidine, 
 (33) N,N′-bis-formyl-N,N′-bis(2,2,6,6-tetramethyl-4-piperidyl)hexamethylenediamine, 
 (34) reaction product of 2,4-bis[(1-cyclohexyloxy-2,2,6,6-piperidin-4-yl)butylamino]-6-chloro-s-triazine with N,N′-bis(3-aminopropyl)ethylenediamine), 
 (35) condensate of 1-(2-hydroxyethyl)-2,2,6,6-tetramethyl-4-hydroxypiperidine and succinic acid, 
 (36) condensate of N,N′-bis(2,2,6,6-tetramethyl-4-piperidyl)-hexamethylenediamine and 4-tert-octyl amino-2, 6-dichloro-1,3,5-triazine, 
 (38) condensate of N,N′-bis-(2,2,6,6-tetramethyl-4-piperidyl)hexamethylenediamine and 4-morpholino-2,6-dichloro-1,3,5-triazine, 
 (39) condensate of N,N′-bis-(1,2,2,6,6-pentamethyl-4-piperidyl)hexamethylenediamine and 4-morpholino-2,6-dichloro-1,3,5-triazine, 
 (41) condensate of 2-chloro-4,6-di-(4-n-butylamino-1,2,2,6,6-pentamethylpiperidyl)-1,3,5-triazine and 1,2-bis-(3-aminopropylamino)ethane, 
 (44) reaction product of maleic acid anhydride-C 18 -C 22 -□-olefin-copolymer with 2,2,6,6-tetramethyl-4-aminopiperidine, 
 (45) oligomeric compound condensate of 4,4′-hexamethylenebis(amino-2,2,6,6-tetramethyl piperidine) and 2,4-dichloro-6-[(2,2,6,6-tetramethylpiperidin-4-yl)butylamino]-s-triazine end-capped with 2-chloro-4,6-bis(dibutylamino)-s-triazine and 
 (47) oligomeric compound condensate of 4,4′-hexamethylenebis(amino-l-propoxy-2,2,6,6-tetramethylpiperidine) and 2,4-dichloro-6-[(1-propoxy-2,2,6,6-tetramethylpiperidin-4-yl)butylamino]-s-triazine end-capped with 2-chloro-4,6-bis(dibutylamino)-s-triazine and binary or ternary combinations thereof. 
 
     
     
         26 . The composition according to claim  1 , wherein the one or more hindered amine light stabilizers is selected from the group consisting of:
 (14) 1-(2-hydroxy-2-methylpropoxy)-4-octadecanoyloxy-2,2,6,6-tetramethylpiperidine,   (34) reaction product of 2,4-bis[(1-cyclohexyloxy-2,2,6,6-piperidin-4-yl)butylamino]-6-chloro-s-triazine with N,N′-bis(3-aminopropyl)ethylenediamine),   (35) condensate of 1-(2-hydroxyethyl)-2,2,6, 6-tetram ethyl-4-hydroxypiperidine and succinic acid,   (36) condensate of N,N′-bis(2,2,6,6-tetramethyl-4-piperidyl)-hexamethylenediamine and 4-tert-octylamino-2,6-dichloro-1,3,5-triazine,   (41) condensate of 2-chloro-4,6-di-(4-n-butylamino-1,2,2,6,6-pentamethylpiperidyl)-1,3,5-triazine and 1,2-bis-(3-aminopropylamino)ethane,   (45) oligomeric compound condensate of 4,4′-hexamethylenebis(amino-2,2,6,6-tetramethyl piperidine) and 2,4-dichloro-6-[(2,2,6,6-tetramethylpiperidin-4-yl)butylamino]-s-triazine end-capped with 2-chloro-4,6-bis(dibutylamino)-s-triazine and   (47) oligomeric compound condensate of 4,4′-hexamethylenebis(amino-l-propoxy-2,2,6,6-tetramethylpiperidine) and 2,4-dichloro-6-[(1-propoxy-2,2,6,6-tetramethylpiperidin-4-yl)butylamino]-s-triazine end-capped with 2-chloro-4,6-bis(dibutylamino)-s-triazine and binary or ternary combinations thereof.   
     
     
         27 . The composition according to claim  1 , wherein the composition comprises essentially no hindered phenolic antioxidants. 
     
     
         28 . The composition according to claim  1 , further comprising one or more organophosphorus stabilizers. 
     
     
         29 . The composition according to claim  1 , wherein the one or more benzofuranone compounds are present from about 20 ppm to about 1000 ppm by weight, based on the weight of the polyolefin. 
     
     
         30 . The composition according to claim  1 , wherein the one or more hindered light amine stabilizers are present from about 20 ppm to about 1500 ppm by weight, based on the weight of the polyolefin. 
     
     
         31 . The composition according to claim  1 , wherein a weight/weight ratio of the one or more benzofuranone compounds to the one or more hindered light amine stabilizers is from about 0.05 to about 1.0. 
     
     
         32 . The composition according to claim  1 , wherein at least one of Y p , Y o  or Y m  is oxygen. 
     
     
         33 . The composition according to claim  1 , wherein at least one of Y p , Y o  or Y m  is a covalent bond. 
     
     
         34 . The composition according to claim  1 , wherein when at least one of Y p , Y o  or Y m  is oxygen,
 R 1p  represents one of subformulae II-p, II-o or II-m,   R 1o  represents one of subformulae II-o or II-m,   R 1m  represents subformula II-m, or   R 1p  together with R 2p , R 1o  together with R 2o  or R 1m  together with R 2m  represent one of subformulae III, IV or V, or   R 1p , R 1o  or R 1m  is C 6 -C 10 -aryl, which is unsubstituted or substituted by C 1 -C 8 -alkyl, C 1 -C 8 -alkoxy, halogen or one phenyl, C 1 -C 18 -alkyl, C 3 -C 16 -cycloalkyl, C 7 -C 13 -aralkyl, C 2 -Cis-alkenyl, C 2 -C 30 -alkyl, which is interrupted by one or more oxygen atoms, or C 2 -C 16 -alkyl, which is interrupted by one sulfur atom,   R 2p  represents one of subformulae II-p, II-o or II-m,   R 20  represents one of subformulae II-o or II-m,   R 2m  represents subformula II-m, or   R 2p  together with R 1p , R 2o  together with R 1o  or R 2m  together with R 1m  represent one of subformulae III, IV or V, or   R 2p , R 2o  or R 2m  are C 6 -C 10 -aryl, which is unsubstituted or substituted by C 1 -C 8 -alkyl, C 1 -C 8 -alkoxy, halogen or one phenyl, C 1 -C 18 -alkyl, C 3 -C 16 -cycloalkyl, C 7 -C 18 -aralkyl, C 2 -C 18 -alkenyl, C 2 -C 30 -alkyl, which is interrupted by one or more oxygen atoms, or C 2 -C 16 -alkyl, which is interrupted by one sulfur atom;   
       when Y p , Y o  or Y m  is a covalent bond,
 R 1p  represents one of subformulae II-p, II-o or II-m, 
 R 1o  represents one of subformulae II-o or II-m, 
 R 1m  represents subformula II-m, or 
 R 1p , R 1o  or R 1m  is C 6 -C 10 -aryl, which is unsubstituted or substituted by C 1 -C 8 -alkyl, C 1 -C 8 -alkoxy, halogen or one phenyl, C 1 -C 18 -alkyl, C 3 -C 16 -cycloalkyl, C 7 -C 13 -aralkyl, C 2 -C 18 -alkenyl, C 2 -C 30 -alkyl, which is interrupted by one or more oxygen atoms, or C 2 -C 16 -alkyl, which is interrupted by one sulfur atom, 
 R 2p , R 2o  and R 2m  are C 6 -C 10 -aryl, which is unsubstituted or substituted by C 1 -C 8 -alkyl, C 1 -C 8 -alkoxy, halogen or one phenyl, or halogen; 
 
       R 4  and R 6  are hydrogen, 
       R 5  and R 7  are each independently hydrogen or C 1 -C 8 -alkyl, 
       R p2  and R p6  are each independently hydrogen or C 1 -alkyl, 
       R p3  and R p5  are each independently hydrogen or C 1 -C 4 -alkyl, 
       R o1  and R 06  are each independently hydrogen or C 1 -C 8 -alkyl, 
       R o2  is hydrogen or C 1 -alkyl, R o5  is hydrogen or C 1 -C 4 -alkyl, 
       R m1  is hydrogen or C 1 -alkyl, 
       R m3  and R m5  are each independently hydrogen or C 1 -C 4 -alkyl, 
       R m6  is hydrogen or C 1 -C 8 -alkyl, 
       R a1 , R a2 , R a3  and R a4  are each independently hydrogen or C 1 -C 4 -alkyl, 
       R b1 , R b2 , R b3 , R b4 , R b5  and R b6  are each independently hydrogen or C 1 -C 4 -alkyl and 
       R c1 , R c2 , R c3  and R c4  are each independently hydrogen or C 1 -C 4 -alkyl. 
     
     
         35 . The composition according to claim  1 , wherein when Y p , Y o  or Y m  is oxygen,
 R 1p  represents one of subformulae II-p, II-o or II-m,   R 1o  represents one of subformulae II-o or II-m,   R 1m  represents subformula II-m, or   R 1p  together with R 2p , R 1o together with R 1o  or R 1m  together with R 2m  represent one of subformulae III, IV or V, or   R 1p , R 1o  or R 1m  are C 6 -C 10 -aryl, which is unsubstituted or substituted by C 1 -C 8 -alkyl, C 1 -C 18 -alkyl or C 3 -C 16 -cycloalkyl and   R 2p  represents one of subformulae II-p, II-o or II-m, R 2o  represents one of subformulae II-o or II-m, R 2m  represents subformula II-m, or   R 2p  together with R 1p , R 2o  together with R 1o  or R 2m  together with R 1m  represent one of subformulae III, IV or V, or   R 2p , R 2o  or R 2m  are C 6 -C 10 -aryl, which is unsubstituted or substituted by C 1 -C 8 -alkyl, C 1 -C 18 -alkyl or C 3 -C 16 -cycloalkyl;   when Y p , Y o  and Y m  represent a covalent bond,   R 1p  represents one of subformulae II-p, II-o or II-m,   R 1o  represents one of subformulae II-o or II-m, R 1m  represents subformula II-m, or R 2p , R 1o  and R 1m  are C 6 -C 10 -aryl, which is unsubstituted or substituted by C 1 -C 8 -alkyl, C 1 -C 18 -alkyl or C 3 -C 16 -cycloalkyl and   R 2p , R 2o  and R 2m  are C 6 -C 10 -aryl, which is unsubstituted or substituted by C 1 -C 8 -alkyl or fluoro.   
     
     
         36 . The composition according to claim  1 , wherein when Y p  or Y o  is oxygen, R 1p , R 2p , R 1o  or R 2o  does not represent subformula II-m; when Y p  or Y o  represents a covalent bond, R 1p  or R 1o  does not represent subformula II-m. 
     
     
         37 . The composition according to claim  1 , wherein Y p  or Y o  is oxygen, R 1p  together with R 2p  or R 1o  together with R 2o  represent one of subformulae III, IV or V, R 2p  together with R 1p  and R 2o  together with R 1o  represent one of subformulae III, IV or V, R 4 , R 5 , R 6  and R 7  are each independently hydrogen or C 1 -C 8 -alkyl, R p2 , R p3 , R p5  and R p6  are each independently hydrogen or C 1 -C 8 -alkyl, R o1 , R o2 , R o5  and R o6  are each independently hydrogen or C 1 -C 8 -alkyl, R a1 , R a2 , R a3  and R a4  are each independently hydrogen or C 1 -C 8 -alkyl, R b1 , R b2 , R b3 , R b4 , R b5  and R b6  are each independently hydrogen or C 1 -C 8 -alkyl and R c1 , R c2 , R c3  and R c4  are each independently hydrogen or Ci-C 8 -alkyl. 
     
     
         38 . The composition according to claim  1 , wherein the one or more benzofuranone compounds has the following structure: 
       
         
           
           
               
               
           
         
       
     
     
         39 . A shaped article comprising the composition according to claim  1 . 
     
     
         40 . A method of preparing the shaped article according to claim  19 , the method comprising melt blending the composition. 
     
     
         41 . An additive composition comprising:
 i) one or more benzofuranone compounds comprising a compound having at least one of formula: I-p 1 , I-o 1  or I-m 1 :   
       
         
           
           
               
               
           
         
       
       wherein X is P or P═O;
 Y p , Y o  and Y m  independently is oxygen or a covalent bond, when Y p , Y o  or Y m  in is oxygen,
 R 1p  represents one of subformulae II-p, II-o or II-m 
 
 
       
         
           
           
               
               
           
         
         R 1o  represents one of subformulae II-o or II-m, 
         R 1m  represents subformula II-m, or 
         R 1p  together with R 2p , R 1o  together with R 2o  or R 1m  together with R 2m  n represent one of subformulae III, IV or V 
       
       
         
           
           
               
               
           
         
       
       or
 R 1p , R 1o  or R 1m  is C 6 -C 10 -aryl, which is unsubstituted or substituted by C 1 -C 8 -alkyl, C 1 -C 8 -alkoxy, halogen or one phenyl, C 1 -C 18 -alkyl, C 3 -C 16 -cycloalkyl, C 7 -C 13 -aralkyl, C 2 -C 18 -alkenyl, C 2 -C 30 -alkyl, which is interrupted by one or more oxygen atoms, or C 2 -C 16 -alkyl, which is interrupted by one sulfur atom, 
 R 2p  represents one of subformulae II-p, II-o or II-m, 
 R 2m  represents subformula II-m, or 
 R 2p  together with R 1p , together with R 1o  or R 2m  together with R 1m  represent one of subformulae III, IV or V, or 
 R 2p , R 2o  or R 2m  is C 6 -C 10 -aryl, which is unsubstituted or substituted by C 1 -C 8 -alkyl, C 1 -C 8 -alkoxy, halogen or one phenyl, C 1 -C 18 -alkyl, C 3 -C 16 -cycloalkyl, C 7 -C 13 -aralkyl, C 2 -C 18 -alkenyl, C 2 -C 30 -alkyl, which is interrupted by one or more oxygen atoms, or C 2 -C 16 -alkyl, which is interrupted by one sulfur atom, or 
 
       when Y p , Y o  or Y m  is a covalent bond,
 R 1p  represents one of subformulae II-p, II-o or II-m, 
 R 1o  represents one of subformulae II-o or II-m, 
 R 1m  represents subformula II-m, or 
 R 1p , R 10  or R 1m  is C 6 -C 10 -aryl, which is unsubstituted or substituted by C 1 -C 8 -alkyl, C 1 -C 8 -alkoxy, halogen or one phenyl, C 1 -C 18 -alkyl, C 3 -C 16 -cycloalkyl, C 7 -C 13 -aralkyl, C 2 -C 18 -alkenyl, C 2 -C 30 -alkyl, which is interrupted by one or more oxygen atoms, or C 2 -C 16 -alkyl, which is interrupted by one sulfur atom, 
 R 2p , R 2o  or R 2m  is C 6 -C 10 -aryl, which is unsubstituted or substituted by C 1 -C 8 -alkyl, C 1 -C 8 -alkoxy, halogen or one phenyl, or halogen; 
 
       R 4 , R 5 , R 6  and R 7  are each independently hydrogen or C 1 -C 8 -alkyl, 
       R p2 , R p3 , R p5  and R p6  are each independently hydrogen or C 1 -C 8 -alkyl, 
       R o1 , R o2 , R o5  and  o6  are each independently hydrogen or C 1 -C 8 -alkyl, 
       R m1 , R m3 , R m5  and R m6  are each independently hydrogen or C 1 -C 8 -alkyl, 
       R a1 , R a2 , R a3  and R a4  are each independently hydrogen or C 1 -C 8 -alkyl, 
       R b1 , R b2 , R b3 , R b4 , R b5  and R c4  are each independently hydrogen or C 1 -C 8 -alkyl and 
       R c1 , R c2 , R c3  and R c4  are each independen
 R 20  represents one of subformulae II-o or II-m, tly hydrogen or C 1 -C 8 -alkyl; and 
 
       ii) one or more hindered light amine stabilizers. 
     
     
         42 . The additive composition according to  claim 21 , wherein a weight/weight ratio of the one or more benzofuranone compounds to the one or more hindered light amine stabilizers is from about 0.05 to about 1.0.