Transparent polymer articles of low thickness

Abstract

The novel transparent polyolefin or polyamide article disclosed is stabilized against the effects of light, oxygen, heat and agressive chemicals by addition of 0.005-0.30% by weight the polymeric substrate of a hydroxyphenyl triazine UV absorber, and is characterized by its thickness between 1 and 500 μm. Preferred polyolefin articles thus stabilized are agricultural films containing as further stabilizer a sterically hindered amine. The novel compositions act as selective UV filter especially useful in agriculture.

1 . A transparent polyolefin or polyamide article having a thickness between 1 and 500 μm, which is stabilized against the effects of light, oxygen, heat and/or agressive chemicals by addition of 0.005-0.30% by weight, based on the polyolefin or polyamide, of a hydroxyphenyl triazine UV absorber, 
     wherein the hydroxyphenyl triazine UV absorber is of formula 
     
       
         
         
             
             
         
       
     
     wherein
 R 1  is OR 7 ; 
 R 2  and R 3  independently are H, methyl, phenyl or OR 9 ; 
 R 4  and R 5  independently are H, methyl or OH; 
 R 7  is C 1 -C 18 alkyl or is C 1 -C 12 alkyl substituted by COOR 12  or by OCOR 15 ; 
 R 9  is C 1 -C 24 alkyl; 
 R 12  is C 1 -C 24 alkyl and 
 R 15  is C 1 -C 12 alkyl. 
 
   
   
       2 . A transparent polyolefin or polyamide article of  claim 1 , which article further contains a sterically hindered amine stabilizer in an amount of 0.01-6% by weight of the polyolefin or polyamide. 
   
   
       3 . A transparent polyolefin or polyamide article of  claim 2  wherein the weight ratio sterically hindered amine:hydroxyphenyl triazine UV absorber ranges from 2:1 to 20:1. 
   
   
       4 . A transparent polyolefin or polyamide article of  claim 2  wherein the sterically hindered amine belongs to the class of hydroxylamine ethers. 
   
   
       5 . A transparent polyolefin or polyamide article of  claim 1  which is a film, fiber, ribbon or stretched tape. 
   
   
       6 . A transparent polyolefin article according to  claim 1 , wherein the polyolefin is polyethylene or polypropylene. 
   
   
       7 . A transparent polyolefin or polyamide article of  claim 1  additionally containing a further component selected from the group consisting of processing stabilizers, fillers, clarifiers, modifiers, acid scavengers, flame retardants and further light stabilizers. 
   
   
       8 . A transparent polyolefin article according to  claim 1  which is a polyolefin agricultural film. 
   
   
       9 . A transparent polyolefin or polyamide article of  claim 1  wherein the sterically hindered amine is selected from
 bis(2,2,6,6-tetramethyl-4-piperidyl)sebacate,   bis(2,2,6,6-tetramethyl-4-piperidyl)succinate,   bis(1,2,2,6,6-pentamethyl-4-piperidyl)sebacate,   bis(1,2,2,6,6-pentamethyl-4-piperidyl) n-butyl-3,5-di-tert-butyl-4-hydroxybenzylmalonate,   the condensate of 1-(2-hydroxyethyl)-2,2,6,6-tetramethyl-4-hydroxypiperidine and succinic acid,   linear or cyclic condensates of N,N′-bis(2,2,6,6-tetramethyl-4-piperidyl)-hexamethylenediamine and 4-tert-octylamino-2,6-dichloro-1,3,5-triazine,   tris(2,2,6,6-tetramethyl-4-piperidyl)nitrilotriacetate,   tetrakis(2,2,6,6-tetramethyl-4-piperidyl)-1,2,3,4-butanetetracarboxylate,   1,1′-(1,2-ethanediyl)-bis(3,3,5,5-tetramethylpiperazinone),   4-benzoyl-2,2,6,6-tetramethylpiperidine,   4-stearyloxy-2,2,6,6-tetramethylpiperidine,   bis(1,2,2,6,6-pentamethylpiperidyl)-2-n-butyl-2-(2-hydroxy-3,5-di-tert-butylbenzyl)malonate,   3-n-octyl-7,7,9,9-tetramethyl-1,3,8-triazaspiro[4.5]decane-2,4-dione,   linear or cyclic condensates of N,N′-bis(2,2,6,6-tetramethyl-4-piperidyl)hexamethylenediamine and 4-morpholino-2,6-dichloro-1,3,5-triazine,   the 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,   the 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,   8-acetyl-3-dodecyl-7,7,9,9-tetramethyl-1,3,8-triazaspiro[4.5]decane-2,4-dione,   3-dodecyl-1-(2,2,6,6-tetramethyl-4-piperidyl)pyrrolidine-2,5-dione,   3-dodecyl-1-(1,2,2,6,6-pentamethyl-4-piperidyl)pyrrolidine-2,5-dione,   a mixture of 4-hexadecyloxy- and 4-stearyloxy-2,2,6,6-tetramethylpiperidine,   a condensate of N,N′-bis(2,2,6,6-tetramethyl-4-piperidyl)hexamethylenediamine and 4-cyclohexylamino-2,6-dichloro-1,3,5-triazine,   a condensate of 1,2-bis(3-aminopropylamino)ethane and 2,4,6-trichloro-1,3,5-triazine as well as 4-butylamino-2,2,6,6-tetramethylpiperidine;   a condensate of 1,6-hexanediamine and 2,4,6-trichloro-1,3,5-triazine as well as N,N-dibutylamine and 4-butylamino-2,2,6,6-tetramethylpiperidine;   N-(2,2,6,6-tetramethyl-4-piperidyl)-n-dodecylsuccinimide,   N-(1,2,2,6,6-pentamethyl-4-piperidyl)-n-dodecylsuccinimide,   2-undecyl-7,7,9,9-tetramethyl-1-oxa-3,8-diaza-4-oxo-spiro[4,5]decane,   a reaction product of 7,7,9,9-tetramethyl-2-cycloundecyl-1-oxa-3,8-diaza-4-oxospiro-[4,5]decane and epichlorohydrin,   1,1-bis(1,2,2,6,6-pentamethyl-4-piperidyloxycarbonyl)-2-(4-methoxyphenyl)ethene,   N,N′-bis-formyl-N,N′-bis(2,2,6,6-tetramethyl-4-piperidyl)hexamethylenediamine,   a diester of 4-methoxymethylenemalonic acid with 1,2,2,6,6-pentamethyl-4-hydroxypiperidine,   poly[methylpropyl-3-oxy-4-(2,2,6,6-tetramethyl-4-piperidyl)]siloxane,   a reaction product of maleic acid anhydride-α-olefin copolymer with 2,2,6,6-tetramethyl-4-aminopiperidine or 1,2,2,6,6-pentamethyl-4-aminopiperidine;   N,N′,N″,N′″-Tetrakis(4,6-bis(butyl-(N-methyl-2,2,6,6-tetramethylpiperidin-4-yl)amino)triazin-2-yl)-4,7-diazadecane-1,10-diamine;   
     
       
         
         
             
             
         
       
       where n is from the range 3-5; 
       sterically hindered hydroxylamine ethers, and mixtures of these compounds; 
       and contained in an amount of 0.01 to 6% by weight of the polyolefin or polyamide. 
     
   
   
       10 . A transparent polyolefin or polyamide article of  claim 1 , where the article contains from 0.005 to 0.15% by weight, based on the polyolefin or polyamide, of a hydroxyphenyl triazine UV absorber. 
   
   
       11 . A transparent polyolefin or polyamide article of  claim 1 , where the article contains from 0.005 to 0.06% by weight, based on the polyolefin or polyamide, of a hydroxyphenyl triazine UV absorber. 
   
   
       12 . A transparent polyolefin or polyamide article of  claim 1 , where the article contains from 0.01 to 0.06% by weight, based on the polyolefin or polyamide, of a hydroxyphenyl triazine UV absorber. 
   
   
       13 . A transparent polyolefin or polyamide article of  claim 1 , where the article contains a further component selected from the group consisting of hindered phenolic antioxidants, hydroxyphenylbenzotriazole or hydroxybenzophenone UV absorbers, phosphites or phosphonites, hydroxylamines and benzofuranones.