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AssigneeBorealis Technology Oy
InventorsPirjo Jaaskelainen, Markus Gahleitner, Manfred Kirchberger, Paivi Pitkanen
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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 Tm−30° C. or less, preferably Tm−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. %.
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 sealing initiation temperature SIT of the film is Tm−30° C. or less, preferably Tm−33° C. or less.
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 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.
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 is multimodal, preferably bimodal.
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 of 4.5 to 12 mol %, wherein the copolymer is having an elution interval of 50° C. or more.
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 random copolymer is a unimodal polymer and the elution interval is determined by the equation
A polymer film comprising a propylene random copolymer which was produced according to a process comprising polymerisation of propylene with a comonomer, said comonomer being ethylene or an α-olefin comprising at least four carbon atoms, in the presence of a catalyst in a multistage process comprising polymerisation of propylene with a comonomer in a first reaction zone including at least one slurry reactor to give a first polymerisation product, transferring said first product to a second reaction zone including at least one gas phase reactor and polymerisation of propylene with a comonomer in said gas phase reactor in the presence of said first polymerisation product, wherein the temperature in the gas phase reactor is higher than that in the slurry reactor.
A polymer film according to any of the preceding claims wherein the comonomer in the propylene random copolymer is ethylene.
A polymer film according to any of the preceding claims having a tensile modulus MD of 400 or less, preferably 350 or less.
A polymer film according to any of the preceding claims having a thickness of 10 to 500 μm.
A polymer film according to any of the preceding claims wherein the propylene copolymer has an MFR2 of 1 to 20, preferably of 2 to 12.
A polymer film according to any of the preceding claims wherein the content of xylene solubles is from 4 to 15 wt. %, preferably from 6 to 10 wt. %.
A polymer film according to any of the preceding claims which further comprises a nucleating agent.
A polymer film according to any of the preceding claims wherein the film has been produced by a cast process.
Dependencies are inferred from the claim text.