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 . 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 commoner content of 4.5 to 12 mol %, wherein the sealing initiation temperature (SIT) of the film is T m −33° C. or less.  
   
   
       2 . A polymer film wherein the polymer consists of 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 12mol %, wherein the sealing initiation temperature JSIT) of the film is T m −30° C. or less.  
   
   
       3 - 10 . (canceled)  
   
   
       11 . A polymer film according to  claim 1 , 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.  
   
   
       12 . A polymer film according to  claim 1 , 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.  
   
   
       13 . A polymer film according to  claim 1 , 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.  
   
   
       14 . A polymer film according to  claim 1  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 intervals 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 %.    
   
   
       15 - 24 . (canceled)  
   
   
       25 . A polymer film according to  claim 2 , 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.  
   
   
       26 . A polymer film according to  claim 2 , 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.  
   
   
       27 . A polymer film according to  claim 2 , 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.  
   
   
       28 . A polymer film according to  claim 2  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 %.    
   
   
       29 . A polymer film according to  claim 1 , wherein the comonomer is the propylene random copolymer is ethylene.  
   
   
       30 . A polymer film according to  claim 2 , wherein the comonomer is the propylene random copolymer is ethylene.