Polymer film comprising a propylene random copolymer

Abstract

The present invention relates in a first embodiment to a polymer film comprising a propylene random copolymer with a total comonomer content of 4.5 to 12 mol % wherein the sealing initiation temperature SIT of the film is T m −30° C. or less, preferably T m −33° C. or less, in a second embodiment to a polymer film comprising a propylene random copolymer with a total comonomer content of 4.5 to 12 mol % wherein the film is having a relative reduction of the static friction value (inside-inside) from one to four days of 35% or more, preferably 40% or more, in a third embodiment to a polymer film comprising a propylene random copolymer with a total comonomer content of 4.5 to 12 mol % wherein the distribution of the comonomer in the random copolymer determined according to TREF method is multimodal, preferably bimodal, in a fourth embodiment to a polymer film comprising a propylene random copolymer with a total comonomer content of 4.5 to 12 mol %, wherein the copolymer is having an elution interval of 50° C. or more, and in a fifth embodiment to a polymer film comprising a copolymer with a total comonomer content of 4.5 to 12 mol % wherein the random copolymer is a unimodal polymer and the elution interval is determined by the equation Y ≦4.5· m +16 wherein Y is the elution interval in ° C. and m is the percentage of ethylene in the copolymer in wt. %.

1 - 3 . (canceled)  
   
   
       4 . A polymer film comprising a propylene random copolymer with the comonomer being ethylene or an α-olefin having at least four carbon atoms and a total comonomer content of 4.5 to 12 mol %, wherein the distribution of the comonomer in the random copolymer, determined according to TREF method using 1,2,4-trichlorobenzene as an eluent, is multimodal or bimodal.  
   
   
       5 . A polymer film comprising a propylene random copolymer with the comonomer being ethylene or an α-olefin comprising at least four carbon atoms and a total comonomer content 4.5 to 12 mol %, wherein the copolymer has an elution interval determined according to TREF method using 1,2,4-trichlorobenzene as an eluent of 50° C. or more.  
   
   
       6 . A polymer film according to  claim 4  wherein the copolymer has a melting temperature of T m  of 135° C. or higher.  
   
   
       7 . A polymer film according to  claim 4  wherein the copolymer has an ethylene content of 5 wt % or lower.  
   
   
       8 . A polymer film comprising a propylene random copolymer with the comonomer being ethylene and a total comonomer content of 4.5 to 12 mol % wherein the random copolymer is a unimodal polymer and its elution interval satisfies the equation  
         Y≦ 4.5 m+ 16  wherein Y is the elution interval in ° C. determined according to TREF method using 1,2,4-trichlorobenzene as an eluent and m is the percentage of ethylene in the copolymer in wt %.    
   
   
       9 - 24 . (canceled)  
   
   
       25 . A polymer film according to  claim 5 , wherein the copolymer has a melting temperature of T m  of 135° C. or higher.  
   
   
       26 . A polymer film according to  claim 5 , wherein the copolymer has an ethylene content of 5 wt % or lower.  
   
   
       27 . A polymer film according to  claim 6 , wherein the copolymer has an ethylene content of 5 wt % or lower.  
   
   
       28 . A polymer film according to  claim 4 , wherein the film has a relative reduction of the static friction value (inside-inside) from one to four days of 35% or more, or 40% or more.  
   
   
       29 . A polymer film according to  claim 5 , wherein the film has a relative reduction of the static friction value (inside-inside) from one to four days of 35% or more, or 40% or more.  
   
   
       30 . A polymer film according to  claim 6 , wherein the film has a relative reduction of the static friction value (inside-inside) from one to four days of 35% or more, or 40% or more.  
   
   
       31 . A polymer film according to  claim 7 , wherein the film has a relative reduction of the static friction value (inside-inside) from one to four days of 35% or more, or 40% or more.  
   
   
       32 . A polymer film according to  claim 8 , wherein the film has a relative reduction of the static friction value (inside-inside) from one to four days of 35% or more, or 40% or more.  
   
   
       33 . A polymer film according to  claim 26 , wherein the film has a relative reduction of the static friction value (inside-inside) from one to four days of 35% or more, or 40% or more.  
   
   
       34 . A polymer film according to  claim 27 , wherein the film has a relative reduction of the static friction value (inside-inside) from one to four days of 35% or more, or 40% or more.  
   
   
       35 . A polymer film according to  claim 28 , wherein the film has a relative reduction of the static friction value (inside-inside) from one to four days of 35% or more, or 40% or more.  
   
   
       36 . A polymer film according to  claim 4 , wherein the film is having a relative reduction of the static friction value (inside-inside) from one to four days of 35% or more, or 40% or more.  
   
   
       37 . A polymer film according to  claim 5 , wherein the film is having a relative reduction of the static friction value (inside-inside) from one to four days of 35% or more, or 40% or more.  
   
   
       38 . A polymer film according to  claim 6 , wherein the film is having a relative reduction of the static friction value (inside-inside) from one to four days of 35% or more, or 40% or more.  
   
   
       39 . A polymer film according to  claim 7 , wherein the film is having a relative reduction of the static friction value (inside-inside) from one to four days of 35% or more, or 40% or more.  
   
   
       40 . A polymer film according to  claim 8 , wherein the film is having a relative reduction of the static friction value (inside-inside) from one to four days of 35% or more, or 40% or more.  
   
   
       41 . A polymer film according to  claim 26 , wherein the film is having a relative reduction of the static friction value (inside-inside) from one to four days of 35% or more, or 40% or more.  
   
   
       42 . A polymer film according to  claim 27 , wherein the film is having a relative reduction of the static friction value (inside-inside) from one to four days of 35% or more, or 40% or more.  
   
   
       43 . A polymer film according to  claim 28 , wherein the film is having a relative reduction of the static friction value (inside-inside) from one to four days of 35% or more, or 40% or more.  
   
   
       44 . A polymer film according to  claim 5 , wherein the distribution of the comonomer in the random copolymer determined according to TREF method using 1,2,4-trichlorobenzene as an eluent is multimodal or bimodal.  
   
   
       45 . A polymer film according to  claim 6 , wherein the distribution of the comonomer in the random copolymer determined according to TREF method using 1,2,4-trichlorobenzene as an eluent is multimodal or bimodal.  
   
   
       46 . A polymer film according to  claim 7 , wherein the distribution of the comonomer in the random copolymer determined according to TREF method using 1,2,4-trichlorobenzene as an eluent is multimodal or bimodal.  
   
   
       47 . A polymer film according to  claim 8 , wherein the distribution of the comonomer in the random copolymer determined according to TREF method using 1,2,4-trichlorobenzene as an eluent is multimodal or bimodal.  
   
   
       48 . A polymer film according to  claim 26 , wherein the distribution of the comonomer in the random copolymer determined according to TREF method using 1,2,4-trichlorobenzene as an eluent is multimodal or bimodal.  
   
   
       49 . A polymer film according to  claim 27 , wherein the distribution of the comonomer in the random copolymer determined according to TREF method using 1,2,4-trichlorobenzene as an eluent is multimodal or bimodal.  
   
   
       50 . A polymer film according to  claim 28 , wherein the distribution of the comonomer in the random copolymer determined according to TREF method using 1,2,4-trichlorobenzene as an eluent is multimodal or bimodal.  
   
   
       51 . A polymer film according to  claim 4 , wherein the copolymer is having an elution interval determined according to TREF method using 1,2,4-trichlorobenzene as an eluent of 50° C. or more.  
   
   
       52 . A polymer film according to  claim 6 , wherein the copolymer is having an elution interval determined according to TREF method using 1,2,4-trichlorobenzene as an eluent of 50° C. or more.  
   
   
       53 . A polymer film according to  claim 7 , wherein the copolymer is having an elution interval determined according to TREF method using 1,2,4-trichlorobenzene as an eluent of 50° C. or more.  
   
   
       54 . A polymer film according to  claim 8 , wherein the copolymer is having an elution interval determined according to TREF method using 1,2,4-trichlorobenzene as an eluent of 50° C. or more.  
   
   
       55 . A polymer film according to  claim 26 , wherein the copolymer is having an elution interval determined according to TREF method using 1,2,4-trichlorobenzene as an eluent of 50° C. or more.  
   
   
       56 . A polymer film according to  claim 27 , wherein the copolymer is having an elution interval determined according to TREF method using 1,2,4-trichlorobenzene as an eluent of 50° C. or more.  
   
   
       57 . A polymer film according to  claim 28 , wherein the copolymer is having an elution interval determined according to TREF method using 1,2,4-trichlorobenzene as an eluent of 50° C. or more.  
   
   
       58 . A polymer film according to  claim 4  with the comonomer being ethylene and a total comonomer content of 4.5 to 12 mol % and wherein the random copolymer is a unimodal polymer and its elution interval satisfies the equation  
         Y≦ 4.5 m+ 16  wherein Y is the elution interval in ° C. determined according to TREF method using 1,2,4-trichlorobenzene as an eluent and m is the percentage of ethylene in the copolymer in wt %.    
   
   
       59 . A polymer film according to  claim 5  with the comonomer being ethylene and a total comonomer content of 4.5 to 12 mol % and wherein the random copolymer is a unimodal polymer and its elution interval satisfies the equation  
         Y≦ 4.5 m+ 16  wherein Y is the elution interval in ° C. determined according to TREF method using 1,2,4-trichlorobenzene as an eluent and m is the percentage of ethylene in the copolymer in wt %.    
   
   
       60 . A polymer film according to  claim 7  with the comonomer being ethylene and a total comonomer content of 4.5 to 12 mol % and wherein the random copolymer is a unimodal polymer and its elution interval satisfies the equation  
         Y≦ 4.5 m+ 16  wherein Y is the elution interval in ° C. determined according to TREF method using 1,2,4-trichlorobenzene as an eluent and m is the percentage of ethylene in the copolymer in wt %.    
   
   
       61 . A polymer film according to  claim 8  with the comonomer being ethylene and a total comonomer content of 4.5 to 12 mol % and wherein the random copolymer is a unimodal polymer and its elution interval satisfies the equation  
         Y≦ 4.5 m+ 16  wherein Y is the elution interval in ° C. determined according to TREF method using 1,2,4-trichlorobenzene as an eluent and m is the percentage of ethylene in the copolymer in wt %.    
   
   
       62 . A polymer film according to  claim 27  with the comonomer being ethylene and a total comonomer content of 4.5 to 12 mol % and wherein the random copolymer is a unimodal polymer and its elution interval satisfies the equation  
         Y≦ 4.5 m+ 16  wherein Y is the elution interval in ° C. determined according to TREF method using 1,2,4-trichlorobenzene as an eluent and m is the percentage of ethylene in the copolymer in wt %.    
   
   
       63 . A polymer film according to  claim 28  with the comonomer being ethylene and a total comonomer content of 4.5 to 12 mol % and wherein the random copolymer is a unimodal polymer and its elution interval satisfies the equation  
         Y≦ 4.5 m+ 16  wherein Y is the elution interval in ° C. determined according to TREF method using 1,2,4-trichlorobenzene as an eluent and m is the percentage of ethylene in the copolymer in wt %.    
   
   
       64 . A polymer film according to  claim 4 , wherein the comonomer is the propylene random copolymer is ethylene.  
   
   
       65 . A polymer film according to  claim 5 , wherein the comonomer is the propylene random copolymer is ethylene.