WO2023063142A1 - 延伸ポリプロピレンフィルム - Google Patents
延伸ポリプロピレンフィルム Download PDFInfo
- Publication number
- WO2023063142A1 WO2023063142A1 PCT/JP2022/036951 JP2022036951W WO2023063142A1 WO 2023063142 A1 WO2023063142 A1 WO 2023063142A1 JP 2022036951 W JP2022036951 W JP 2022036951W WO 2023063142 A1 WO2023063142 A1 WO 2023063142A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- propylene
- resin
- random copolymer
- film
- polypropylene film
- Prior art date
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- 239000004743 Polypropylene Substances 0.000 title claims abstract description 90
- -1 polypropylene Polymers 0.000 title claims abstract description 89
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 89
- 229920005989 resin Polymers 0.000 claims abstract description 95
- 239000011347 resin Substances 0.000 claims abstract description 95
- 229920005604 random copolymer Polymers 0.000 claims abstract description 70
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims abstract description 65
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims abstract description 64
- 239000004711 α-olefin Substances 0.000 claims abstract description 51
- 239000000203 mixture Substances 0.000 claims abstract description 24
- 238000003860 storage Methods 0.000 claims abstract description 21
- 230000008859 change Effects 0.000 claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 239000010410 layer Substances 0.000 claims description 50
- 238000005259 measurement Methods 0.000 claims description 30
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 claims description 29
- 239000005026 oriented polypropylene Substances 0.000 claims description 27
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 24
- 239000005977 Ethylene Substances 0.000 claims description 24
- IAQRGUVFOMOMEM-UHFFFAOYSA-N butene Natural products CC=CC IAQRGUVFOMOMEM-UHFFFAOYSA-N 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 17
- 239000002344 surface layer Substances 0.000 claims description 17
- IYYGCUZHHGZXGJ-UHFFFAOYSA-N but-1-ene;ethene;prop-1-ene Chemical compound C=C.CC=C.CCC=C IYYGCUZHHGZXGJ-UHFFFAOYSA-N 0.000 claims description 12
- 230000006698 induction Effects 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 239000013078 crystal Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 14
- 238000012545 processing Methods 0.000 abstract description 13
- 238000002156 mixing Methods 0.000 abstract description 5
- 239000000758 substrate Substances 0.000 abstract description 5
- 239000005001 laminate film Substances 0.000 abstract description 4
- 238000004458 analytical method Methods 0.000 abstract description 2
- 230000002349 favourable effect Effects 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 31
- 239000002216 antistatic agent Substances 0.000 description 18
- 239000004594 Masterbatch (MB) Substances 0.000 description 15
- 238000005481 NMR spectroscopy Methods 0.000 description 11
- 238000012360 testing method Methods 0.000 description 11
- 239000000523 sample Substances 0.000 description 7
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 6
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 6
- 238000003475 lamination Methods 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 6
- 238000007639 printing Methods 0.000 description 6
- 238000001644 13C nuclear magnetic resonance spectroscopy Methods 0.000 description 5
- 238000000137 annealing Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 238000005227 gel permeation chromatography Methods 0.000 description 5
- 230000006872 improvement Effects 0.000 description 5
- 230000000930 thermomechanical effect Effects 0.000 description 5
- 230000037303 wrinkles Effects 0.000 description 5
- NIPNSKYNPDTRPC-UHFFFAOYSA-N N-[2-oxo-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 NIPNSKYNPDTRPC-UHFFFAOYSA-N 0.000 description 4
- 239000000654 additive Substances 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 4
- 230000000704 physical effect Effects 0.000 description 4
- PBKONEOXTCPAFI-UHFFFAOYSA-N 1,2,4-trichlorobenzene Chemical compound ClC1=CC=C(Cl)C(Cl)=C1 PBKONEOXTCPAFI-UHFFFAOYSA-N 0.000 description 3
- MKYBYDHXWVHEJW-UHFFFAOYSA-N N-[1-oxo-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propan-2-yl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(C(C)NC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 MKYBYDHXWVHEJW-UHFFFAOYSA-N 0.000 description 3
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 229910052809 inorganic oxide Inorganic materials 0.000 description 3
- 229920002521 macromolecule Polymers 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910044991 metal oxide Inorganic materials 0.000 description 3
- SNVLJLYUUXKWOJ-UHFFFAOYSA-N methylidenecarbene Chemical group C=[C] SNVLJLYUUXKWOJ-UHFFFAOYSA-N 0.000 description 3
- 229920000098 polyolefin Polymers 0.000 description 3
- 239000011342 resin composition Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000007740 vapor deposition Methods 0.000 description 3
- RFFLAFLAYFXFSW-UHFFFAOYSA-N 1,2-dichlorobenzene Chemical class ClC1=CC=CC=C1Cl RFFLAFLAYFXFSW-UHFFFAOYSA-N 0.000 description 2
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 2
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 description 2
- WSSSPWUEQFSQQG-UHFFFAOYSA-N 4-methyl-1-pentene Chemical compound CC(C)CC=C WSSSPWUEQFSQQG-UHFFFAOYSA-N 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000003851 corona treatment Methods 0.000 description 2
- 229920006038 crystalline resin Polymers 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 229920001384 propylene homopolymer Polymers 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000005019 vapor deposition process Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002087 whitening effect Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- CPHJEACXPATRSU-UHFFFAOYSA-N 2-[2-hydroxyethyl(tetradecyl)amino]ethanol Chemical compound CCCCCCCCCCCCCCN(CCO)CCO CPHJEACXPATRSU-UHFFFAOYSA-N 0.000 description 1
- BITAPBDLHJQAID-KTKRTIGZSA-N 2-[2-hydroxyethyl-[(z)-octadec-9-enyl]amino]ethanol Chemical compound CCCCCCCC\C=C/CCCCCCCCN(CCO)CCO BITAPBDLHJQAID-KTKRTIGZSA-N 0.000 description 1
- NKFNBVMJTSYZDV-UHFFFAOYSA-N 2-[dodecyl(2-hydroxyethyl)amino]ethanol Chemical compound CCCCCCCCCCCCN(CCO)CCO NKFNBVMJTSYZDV-UHFFFAOYSA-N 0.000 description 1
- 102100038916 Caspase-5 Human genes 0.000 description 1
- 101100112336 Homo sapiens CASP5 gene Proteins 0.000 description 1
- 101100273286 Mus musculus Casp4 gene Proteins 0.000 description 1
- AOMUHOFOVNGZAN-UHFFFAOYSA-N N,N-bis(2-hydroxyethyl)dodecanamide Chemical compound CCCCCCCCCCCC(=O)N(CCO)CCO AOMUHOFOVNGZAN-UHFFFAOYSA-N 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000001460 carbon-13 nuclear magnetic resonance spectrum Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical class OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 1
- 238000000113 differential scanning calorimetry Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003480 eluent Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 238000004742 high temperature nuclear magnetic resonance Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- INQOMBQAUSQDDS-UHFFFAOYSA-N iodomethane Chemical compound IC INQOMBQAUSQDDS-UHFFFAOYSA-N 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000013365 molecular weight analysis method Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- SKDZEPBJPGSFHS-UHFFFAOYSA-N n,n-bis(2-hydroxyethyl)tetradecanamide Chemical compound CCCCCCCCCCCCCC(=O)N(CCO)CCO SKDZEPBJPGSFHS-UHFFFAOYSA-N 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 239000012766 organic filler Substances 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 229920005629 polypropylene homopolymer Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/14—Copolymers of propene
Definitions
- the present invention relates to a stretched polypropylene film.
- oriented polypropylene film has been widely used for various purposes, including packaging materials, taking advantage of its excellent transparency, mechanical strength, moisture resistance, rigidity, etc.
- efforts such as reducing the thickness have been made to reduce the amount of polypropylene used.
- Patent Document 1 there is a known technique for making a film with high-temperature rigidity and heat resistance by making a stretched film using polypropylene with high stereoregularity and a narrow molecular weight distribution ( See Patent Document 1).
- the polypropylene described in Patent Document 1 has a narrow stretchable temperature range, requires strict temperature control in the longitudinal and transverse stretching processes, and furthermore, there is a problem that the defect rate increases due to the occurrence of uneven stretching. be.
- a polypropylene composition containing a two-component polypropylene selected from polypropylene having a pentad fraction of 92% or more, which is an index of high stereoregularity, and having a difference between the two pentad fraction values of 1 to 5% is used.
- a stretched film has been proposed (see Patent Document 2).
- polypropylene with a low pentad fraction is used, the stretchability is improved and the defect rate due to stretch unevenness is reduced compared to the film described in Patent Document 1, but the film is still not fully satisfactory.
- heat resistance and dimensional stability have not been studied, and there is room for improvement.
- a propylene polymer composition comprising a propylene homopolymer and a propylene/ ⁇ -olefin random copolymer, wherein the ⁇ -olefin content of the composition is 0.3 to 1.6% by weight, and A polypropylene resin composition having an isotactic pentad index of 0.97 or more, an extraction amount with xylene of 3% or less, and a melt flow rate of 0.5 to 10 (g/10 minutes) is used.
- a method has been proposed (see Patent Document 3). This method also has a tendency to cause uneven stretching because the stretchability is not sufficient.
- the present invention has been made in view of the above points, and it is possible to efficiently produce a film of stable quality by improving the rigidity of the film, providing good heat resistance and dimensional stability, and having good stretchability. It is an object of the present invention to provide a stretched polypropylene film that can contribute to the efficiency of production in secondary processing as well.
- the first invention consists of a base layer and a surface layer laminated on one or both sides of the base layer, and is measured by a thermomechanical measurement apparatus (TMA) from 30 ° C. to 150 ° C. at 5 ° C./min.
- TMA thermomechanical measurement apparatus
- the dimensional change rate at 140°C in the MD direction when the temperature is increased and a load of 0.32 N is applied is 30% or less, and the dynamic viscoelasticity measurement is performed at a temperature increase rate of 3°C/min and a frequency of 1.0 Hz.
- the base layer is , a polypropylene resin (A) having a mesopentad fraction (mmmm) of 95% or more, and a propylene/ ⁇ -olefin random copolymer (B) mixed with at least two different resin mixtures, wherein the propylene
- the oriented polypropylene film is characterized in that the ⁇ -olefin random copolymer (B) is mixed in an amount of 1 to 10% by weight with respect to 100% by weight of the resin mixture.
- the propylene/ ⁇ -olefin random copolymer (B) is a propylene/ethylene/1-butene random copolymer, a propylene/ethylene random copolymer, a propylene/1 - relates to an oriented polypropylene film which is at least one type selected from butene random copolymers;
- a third invention relates to a stretched polypropylene film according to the second invention, wherein the propylene/ ⁇ -olefin random copolymer (B) is a propylene/ethylene/1-butene random copolymer.
- a fourth invention relates to a stretched polypropylene film according to the third invention, wherein the propylene/ethylene/1-butene random copolymer has an ethylene content of 5 to 15 mol% and a butene content of 5 to 20 mol%.
- the laminated film has a heat shrinkage rate of 6.5% or less in the MD direction and the TD direction in heat treatment at 150 ° C. for 5 minutes. It relates to polypropylene film.
- the laminated film in any one of the first to fifth inventions, is the most mobile when the free induction decay curve at 70 ° C. is approximated by three components in the measurement by the solid echo method of pulse NMR. It relates to a oriented polypropylene film having a low crystalline component (H) in an amount of 55-70% and an amorphous component (S) having the highest mobility in an amount of 5-11%.
- the stretched polypropylene film according to the first invention, it consists of a base layer and a surface layer laminated on one or both sides of the base layer, and is measured by a thermomechanical measurement apparatus (TMA) from 30 ° C. to 150 ° C.
- TMA thermomechanical measurement apparatus
- the dimensional change rate at 140°C in the MD direction when the temperature is increased at °C/min and a load of 0.32N is applied is 30% or less, and the dynamic viscoelasticity measurement is performed at a temperature increase rate of 3°C/min and a frequency of 1.
- a laminated film that satisfies that the storage modulus (E′) in the TD direction at 120° C. measured at 0 Hz is 600 MPa or more and the storage modulus (E′) in the TD direction at 140° C.
- the base material layer is composed of at least two different resin mixtures in which a polypropylene resin (A) having a mesopentad fraction (mmmm) of 95% or more is mixed with a propylene/ ⁇ -olefin random copolymer (B).
- the propylene/ ⁇ -olefin random copolymer (B) is mixed in an amount of 1 to 10% by weight with respect to 100% by weight of the resin mixture.
- the propylene/ ⁇ -olefin random copolymer (B) is a propylene/ethylene/1-butene random copolymer, propylene/ethylene Since it is at least one selected from random copolymers and propylene/1-butene random copolymers, it is possible to improve stretchability while maintaining the dimensional stability and rigidity of the film.
- the propylene/ ⁇ -olefin random copolymer (B) is a propylene/ethylene/1-butene random copolymer. Stretchability can be improved while maintaining dimensional stability and rigidity.
- the propylene/ethylene/1-butene random copolymer has an ethylene content of 5 to 15 mol% and a butene content of 5 to 20 mol%. Therefore, it is possible to improve stretchability while maintaining the dimensional stability and rigidity of the film.
- the laminated film has a heat shrinkage rate of 6.0 in the MD direction and the TD direction when heat-treated at 150° C. for 5 minutes. Since it is 5% or less, it is excellent in dimensional stability and can contribute to the improvement of productivity.
- the laminated film approximates the free induction attenuation curve at 70 ° C. by three components in the measurement by the solid echo method of pulse NMR. Since the amount of the crystalline component (H) with the lowest mobility is 55 to 70% and the amount of the amorphous component (S) with the highest mobility is 5 to 11%, stretch spots are suppressed. In addition, it is possible to obtain a film having excellent rigidity and heat resistance.
- the oriented polypropylene film of the present invention uses a polypropylene resin (A) having a mesopentad fraction (mmmm) of 95% or more in the base layer to form a film having high rigidity and heat resistance, while propylene / ⁇ -olefin random
- A polypropylene resin
- B propylene / ⁇ -olefin random
- the oriented polypropylene film of the present invention was measured by a thermomechanical measurement apparatus (TMA) at a temperature increase of 5 ° C./min from 30 ° C. to 150 ° C., and a dimensional change at 140 ° C. in the MD direction when a load of 0.32 N was applied.
- modulus is 30% or less
- the storage modulus (E') in the TD direction measured by dynamic viscoelasticity measurement at a heating rate of 3 ° C./min and a frequency of 1.0 Hz is 600 MPa or more at 120 ° C. and TD at 140 ° C. It is a laminated film that satisfies a directional storage modulus (E′) of 300 MPa or more.
- thermomechanical measurement apparatus is the metal or inorganic oxide
- the dimensional change rate is 30. % or less can contribute to the efficiency of production in secondary processing.
- the storage elastic modulus (E') is the energy stored inside the object out of the energy generated by the external force and strain on the object.
- the storage elastic modulus in the TD direction at 120 ° C. measured by dynamic viscoelasticity measurement at a heating rate of 3 ° C./min and a frequency of 1.0 Hz is 600 MPa or more and the storage elastic modulus in the TD direction at 140 ° C. ( A film having E′) of 300 MPa or more is excellent in elastic modulus, rigidity and heat resistance in a high temperature environment.
- the present invention has excellent dimensional stability in a high-temperature environment, and when performing processing such as vapor deposition, printing, or lamination of a metal or inorganic oxide layer on an oriented polypropylene film, elongation under a high-temperature load decreases, and during the vapor deposition process, Wrinkles, deformation, and misregistration during printing are less likely to occur, processing efficiency is remarkably improved, wrinkles during lamination are suppressed, and use in higher temperature environments becomes possible. Therefore, it can greatly contribute to the improvement of production efficiency in secondary processing such as films for food packaging and films for industrial use.
- the polypropylene resin (A) must have a mesopentad fraction (mmmm) of 95% or more.
- a mesopentad fraction (mmmm) of 95% or more.
- crystallinity is easily improved, and a film excellent in rigidity and heat resistance can be obtained.
- a polypropylene resin having a mesopentad fraction of less than 95% is used, the rigidity and heat resistance of the film tend to deteriorate.
- the mesopentad fraction (mmmm) is 95% or more, there is no particular limitation, and a polypropylene homopolymer or a copolymer with ethylene or an ⁇ -olefin having 4 or more carbon atoms can be used.
- a propylene homopolymer that does not contain ethylene and an ⁇ -olefin having 4 or more carbon atoms is particularly preferred.
- the mesopentad fraction (mmmm) is an index of stereoregularity that can be obtained by high temperature nuclear magnetic resonance (NMR) measurements.
- the mesopentad fraction (mmmm) can be measured using 13 C-NMR, and the mesopentad fraction is calculated by the method described in "Zambelli et al., Macromolecules, Vol. 6, p.925 (1973)". can do.
- the pentad fraction which represents the degree of stereoregularity, indicates the abundance of isotactic chains in the pentad units in the polypropylene molecular chain measured using 13 C-NMR, and five consecutive isotactic chains in the propylene unit.
- the fraction (mmmm) of propylene monomers in the center of meso-linked chains is the fraction (mmmm) of propylene monomers in the center of meso-linked chains. Specifically, the intensity fraction of the mmmm peak in all absorption peaks in the methyl carbon region of the 13 C-NMR spectrum is defined as the isotactic pentad unit.
- the polypropylene resin (A) is mixed with the propylene/ ⁇ -olefin random copolymer (B) to form a resin mixture, which constitutes the base material layer.
- the propylene/ ⁇ -olefin random copolymer (B) is mixed in an amount of 1 to 10% by weight with respect to 100% by weight of the resin mixture.
- Propylene/ ⁇ -olefin random copolymer (B) is a random copolymer of propylene and ⁇ -olefin (excluding propylene). -pentene, 1-hexene, 4-methyl-1-pentene, 1-octene and the like. These copolymers may be used alone or in combination of two or more.
- propylene/ ⁇ -olefin random copolymers propylene/ethylene random copolymers, propylene/ethylene/1-butene random copolymers, and propylene/1-butene random copolymers are preferable, and propylene/ethylene/1- More preferred are butene random copolymers.
- the propylene/ethylene/1-butene random copolymer preferably has an ethylene content of 1 to 15 mol% and a butene content of 1 to 20 mol%, more preferably an ethylene content of 5 to 15 mol% and a butene content.
- the amount is 5-20 mol %, most preferably the ethylene content is 7-14 mol % and the butene content is 7-17 mol %.
- the resin mixture mainly composed of a polypropylene resin having a high pentad fraction can be provided with good stretchability, and good rigidity and heat resistance can be maintained.
- the ethylene and butene contents of the propylene/ ⁇ -olefin random copolymer (B) can be obtained by a known method from the integrated intensity obtained by 13 C-NMR measurement.
- Ethylene content and butene content are determined by the following formulas (i-1) and (i-2).
- Ethylene content (mol%) IE x 100/(IE + IP + IB) (i-1)
- Butene content (mol%) IB x 100/(IE + IP + IB) (i-2)
- IE, IP and IB are integral intensities for ethylene, propylene and butene, respectively, and are obtained by the following formulas (i-3), (i-4) and (i-5).
- IE I ⁇ /2+I ⁇ /4 ⁇ I ⁇ +I ⁇ (P)+I ⁇ (P)+I ⁇ (B)+I ⁇ (B) (i-3)
- IP 1/3 ⁇ [I CH3 (P)+ ICH (P)+I ⁇ (PP)+1/2 ⁇ (I ⁇ (PB)+I ⁇ (P)+I ⁇ (P))] (i ⁇ 4)
- IB 1/4 ⁇ [( ICH3 (B)+ ICH (B)+ I2B2 + I ⁇ (BB))+1/2 ⁇ ( I ⁇ (PB)+ I ⁇ (B)+ I ⁇ (B))] . ⁇ (i-5)
- the subscript (P) is a signal based on propylene-derived methyl group branching, and similarly (B) is a signal based on butene-derived ethyl group branching.
- ⁇ (PP) is the methylene carbon signal based on the propylene linkage
- ⁇ (BB) is the methylene carbon signal based on the butene linkage
- ⁇ (PB) is the methylene carbon signal based on the propylene-butene linkage. is a signal.
- I ⁇ I 24.8-23.3
- I ⁇ I 30.0-29.6
- I ⁇ I 29.6-29.2
- I ⁇ (P)+ I ⁇ (P) I 38.5 ⁇ 37.2
- I ⁇ (B) I 34.5 ⁇ 33.5
- I CH3 (P) I 22.6-18.0
- I CH (P) I 29.2-27.9 +I 31.1-30.0 +I 33.5-32.2
- I ⁇ (BB) I 40.2-39.5
- I ⁇ (PB) I 43.7-41.6
- I2B2 I26.9-26.0
- the lower limit of the melting temperature (Tm) of the polypropylene resin (A) constituting the base material layer as measured by a differential scanning calorimeter (DSC) is preferably 162°C, more preferably 163°C, and even more preferably 164°C. is.
- Tm melting temperature
- DSC differential scanning calorimeter
- the melt flow rate (MFR) (230° C., 2.16 kgf) of the polypropylene resin (A) constituting the base material layer is preferably 1 to 15 g/10 min, more preferably 1.0 g/10 min, from the viewpoint of extrusion moldability. It is 5 to 10 g/10 min, more preferably 2.0 to 8 g/10 min.
- the MFR (230° C., 2.16 kgf) of the propylene/ ⁇ -olefin random copolymer (B) is preferably 5 to 15 g/10 min, more preferably 6 to 10 g/10 min. Within the above range, the mechanical load tends to be small and the stretchability tends to be easy.
- the weight average molecular weight (Mw) measured by gel permeation chromatography (GPC) of the polypropylene resin (A) constituting the base material layer is not particularly limited, but is preferably 250,000 or more and 600,000 or less. More preferably, it is 300,000 or more and 550,000 or less. Further, the molecular weight distribution (Mw/Mn) represented by the ratio (Mw/Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) is preferably 2 or more and 20 or less, and 4 or more and 10 or less. is more preferable. Within the above range, resin fluidity is excellent, stretching during film molding is facilitated, and thickness unevenness is reduced, which contributes to improved productivity.
- the GPC apparatus used in the GPC method is not particularly limited, and a commercially available high-temperature GPC apparatus capable of molecular weight analysis of polyolefins is used.
- the laminated film of the present invention is a laminated film comprising a base layer and a surface layer laminated on one or both sides of the base layer, and in the case of the base layer and the surface layer laminated on one side, one type 2 It may be a layer structure, or a two-layer two-layer structure. In the case of the base layer and the surface layers laminated on both sides (first surface layer and second surface layer), a one-layer three-layer structure. , a two-kind, three-layer structure, or a three-kind, three-layer structure.
- the pentad fraction of the polypropylene resin used for the surface layer is preferably 90% or more.
- a low-crystalline resin for the surface layer when using a low-crystalline resin for the surface layer to effectively bleed out antistatic performance or impart heat-sealing performance, it can be used within a range that does not impair the desired physical properties of the laminated film.
- low-crystalline resins include random copolymers of propylene and ⁇ -olefins (excluding propylene), propylene/ethylene random copolymers, propylene/ethylene/1-butene random copolymers, Examples include propylene/1-butene random copolymers.
- the thickness of the laminated film as a whole is preferably 9 to 100 ⁇ m, more preferably 10 to 80 ⁇ m, even more preferably 12 to 60 ⁇ m, particularly preferably 12 to 50 ⁇ m.
- the thickness of the surface layer can be adjusted within a range that does not impair the desired physical properties of the laminated film.
- additives may be added to the laminated film as appropriate.
- additives include antioxidants, ultraviolet absorbers, antistatic agents, lubricants, nucleating agents, adhesives, antifogging agents, flame retardants, antiblocking agents, inorganic or organic fillers, and the like.
- antistatic agents include aliphatic amine compounds such as lauryldiethanolamine, myristyldiethanolamine and oleyldiethanolamine; aliphatic amide compounds such as lauryldiethanolamide, myristyldiethanolamide and oleyldiethanolamide; and polyhydric alcohols.
- the antistatic agent can be added by known methods.
- a high-concentration masterbatch may be prepared separately and mixed in an arbitrary step, or may be premixed with polyolefin powder or polyolefin pellets.
- a known mixer or extruder such as a Banbury mixer, a Henschel mixer, a tumbler mixer, a single-screw extruder and a multi-screw extruder is used to mix the polyolefin resin and the antistatic agent. It can be obtained by heating and kneading.
- the heat shrinkage rate of the oriented polypropylene film of the present invention at 150°C is preferably 6.5% or less in each of the MD and TD directions. It becomes a film with excellent mechanical properties, heat resistance and dimensional stability in a high temperature environment.
- the crystal component (H) with the lowest mobility when the free induction attenuation curve at 70 ° C. is approximated by three components in the measurement by the solid echo method of pulse NMR is 55 to 70%.
- the amount of the amorphous component (S) having the highest mobility is 5 to 11% or less. More preferably, the crystalline component amount (H) is 60% or more and 70% or less, and the amorphous component amount (S) is 5 to 10% or less.
- a laminate film having not only good stretchability but also rigidity, heat resistance, and dimensional stability in a well-balanced manner can be obtained.
- the (H) component of the oriented polypropylene film is less than 55%, the rigidity and heat resistance are poor, and if it is 70% or more, the stretchability tends to deteriorate and the productivity tends to deteriorate.
- the (S) component of the stretched polypropylene film is less than 5%, sufficient stretchability is not obtained and stretch unevenness tends to occur, and when it is more than 11%, stretchability is good, but stiffness and heat resistance tend to be inferior.
- Pulsed NMR is an analytical method for evaluating the mobility of polymer molecular chains as a whole system, and molecular mobility can be evaluated by measuring the relaxation time and signal intensity at that time.
- the lower the mobility of the polymer chain the shorter the relaxation time, so the signal intensity decays faster, and the relative signal intensity decreases in a short time when the initial signal intensity is taken as 100%.
- the higher the mobility of the polymer chain the longer the relaxation time, so the attenuation of the signal intensity becomes slower, and the relative signal intensity when the initial signal intensity is 100% gradually decreases over a long period of time.
- a method of separating and analyzing three components using pulse NMR is known.
- the free induction decay curve at 70 ° C. measured by the solid echo method of pulse NMR is simultaneously fitted with a plurality of mixed components (H, M, S) according to the following formula (ii), and the relaxation time T2 of each component is calculated. was calculated.
- the relaxation time T2 is correlated with the mobility of the molecule. The shorter the relaxation time T2, the lower the mobility of the molecule, and the longer the relaxation time T2, the higher the mobility of the molecule.
- each component ratio is calculated according to formulas (iii) to (v).
- the (M) component is a constrained amorphous component, has a relaxation time between the (H) component and the (S) component, and has a molecular mobility between the (H) component and the (S) component. .
- a (t) A (0) H x exp ⁇ -(t/T 2H ) WH ⁇ + A (0) M x exp ⁇ - (t/T 2M ) WM ⁇ + A (0) S x exp ⁇ -(t /T 2S ) WS ⁇ (ii)
- F (H) ⁇ A (0) H / (A (0) H + A (0) M + A (0) S ) ⁇ x 100
- F (M) ⁇ A (0) M / (A (0) H + A (0) M + A (0) S ) ⁇ x 100 (iv)
- F (S) ⁇ A (0) S / (A (0) H + A (0) M + A (0) S) ⁇ x 100 (v) t: Acquisition time A (t) : Signal intensity at acquisition time t
- a (0)H Initial value of signal intensity of (H) component (y-axis value when x-axis is 0)
- a (0)M Initial value of signal intensity of (
- the method for producing the stretched polypropylene film of the present invention is not particularly limited.
- the resins constituting each layer are put into three extruders, and the first surface layer / base layer / second surface layer are laminated in this order, and co-extruded from a three-layer T die set at 200 to 250 ° C., It is cooled with a cooling roll at 20° C. to 60° C. and solidified to obtain a raw sheet. It is preferable to further put the raw sheet into a water tank.
- the cooling temperature is preferably 40° C. or lower, and is preferably 30° C. or lower in order not only to obtain transparency of the original sheet, but also to facilitate stretching in the next step and to reduce thickness unevenness. .
- the original sheet is preheated at a set temperature of 110°C to 140°C, stretched 4 to 6 times in the MD direction, and then annealed at 130 to 150°C.
- MD direction stretching may be carried out in multiple stages of two or more stages using three or more stretching rolls.
- the film can be easily drawn in the TD drawing step, and the productivity is improved.
- it is preheated with a tenter at a set temperature of 170°C to 185°C, and stretched 6 to 12 times in the TD direction at a stretching temperature of 155°C to 170°C. Further, annealing is performed in an atmosphere of 160 to 175° C. with relaxation of 3 to 10%.
- the annealing temperature should be high, but if it is set too high, the low-molecular-weight components will melt and recrystallize, roughening the film surface and leading to whitening.
- the heat shrinkage rate can be lowered by increasing the relaxation, but if the relaxation is too large, the stiffness of the film tends to decrease.
- a roll sample of the oriented polypropylene film can be obtained by applying a corona discharge treatment to at least one side of the oriented polypropylene film thus obtained and then winding it up with a winder.
- An antistatic agent masterbatch (resin PP-9) was used as an additive. Based on the resin PP-3, it was prepared so that the concentration of the antistatic agent was 9%.
- the melting temperature was obtained by differential scanning calorimetry (DSC) measured according to JIS K 7121 (2012). Measured using "DSC6200” manufactured by Seiko Instruments Inc. (unit: ° C.)
- melt flow rate (MFR) was measured according to JIS K 7210-1 (2014) A method.
- the substrate layer is made of polypropylene resin (A), 95% by weight of resin PP-1, and 5% by weight of resin PP-4 as propylene/ ⁇ -olefin random copolymer (B). And resin PP-3 was used as the resin used for the second surface layer. It is put into each of the three extruders, laminated in the order of the first surface layer / base layer / second surface layer, co-extruded from a three-layer T die set at 240 ° C., and brought into contact with a cooling roll at 30 ° C. , was placed in a water bath at 30° C. to obtain a raw sheet.
- the sheet was preheated at a set temperature of 135°C, stretched 5 times in the MD direction, and then annealed at 140°C.
- the film was preheated with a tenter at a set temperature of 182°C, stretched 8 times in the TD direction at a stretching temperature of 163°C, and then annealed at 170°C while relaxing at 6.5%.
- one side of the film was subjected to a corona discharge treatment, and then wound up with a winding machine to obtain a stretched polypropylene film of Prototype Example 1.
- a stretched polypropylene film of Prototype Example 9 was obtained in the same manner as in Prototype Example 2, except that 9 was used in a composition of 10% by weight.
- ⁇ Prototype Example 11 78% by weight of resin PP-1 as polypropylene resin (A) for the base layer, 12% by weight of resin PP-6 as propylene/ ⁇ -olefin random copolymer (B), and resin PP- as antistatic agent masterbatch A stretched polypropylene film of Prototype Example 10 was obtained in the same manner as in Prototype Example 10, except that 9 was changed to 10% by weight.
- the base material layer was polypropylene resin (A), the resin PP-1 was 100% by weight, the stretching temperature in the TD direction was 165 ° C., and the annealing temperature in the TD direction was 168 ° C. Same as Prototype Example 1, Comparative Example A 1-1 oriented polypropylene film was obtained.
- Comparative Example 1-2 A stretched polypropylene film of Comparative Example 1-2 was obtained in the same manner as in Comparative Example 1-1, except that the preheating temperature in the TD direction was 185°C and the stretching temperature in the TD direction was 163°C.
- Comparative Example 1-3 A stretched polypropylene film of Comparative Example 1-3 was obtained in the same manner as in Comparative Example 1-1 except that the preheating temperature in the TD direction was 180°C and the stretching temperature in the TD direction was 165°C.
- Comparative Example 1-4 A stretched polypropylene film of Comparative Example 1-4 was obtained in the same manner as in Comparative Example 1-1 except that the preheating temperature in the TD direction was 178°C and the stretching temperature in the TD direction was 168°C.
- the base layer is a polypropylene resin (A), 90% by weight of resin PP-3, and 10% by weight of resin PP-9 as an antistatic agent masterbatch.
- a stretched polypropylene film of Comparative Example 3 was obtained in the same manner as in Prototype Example 1 except that the temperature was 164°C and the annealing temperature in the TD direction was 168°C.
- Tables 1 to 3 summarize the resin composition and film forming conditions of the intermediate layer and surface layer of each prototype example and comparative example.
- the dimensional change rate (%) was measured using a thermomechanical measuring device (manufactured by TA Instruments Japan Co., Ltd., "model number: Q400") as a TMA measuring device.
- the stretched polypropylene film of each prototype example and comparative example was cut into a test piece with a size of 8 mm ⁇ 4 mm, the MD direction of the test piece was set as the tensile direction, and fixed to the probe of the TMA device. Read the length (L 0 ) of the specimen at the time of initial loading. Heat from 30°C to 150°C at a heating rate of 5°C/min, and read the length (L 1 ) of the test piece after heating to 140°C.
- ⁇ Storage modulus> The storage modulus (MPa) was measured in the TD direction at 120° C. and 140° C. under the following conditions using “DVA-225” manufactured by IT Keisoku Co., Ltd. Deformation mode: Tensile Temperature range: -60°C to 150°C Heating rate: 3°C/min Frequency: 1Hz Environment: under air
- Heat shrinkage rate (%) was measured according to JIS Z 1712 (2009).
- a test piece of 15 mm in the TD direction and 200 mm in the MD direction was cut out from the stretched polypropylene film of each prototype example and comparative example, and the test length (l 0 ) before heating was marked by marking the position of 50 mm from both ends, and the hot air oven at 150 ° C. It was hung inside and heated for 5 minutes. Then, it was taken out and cooled at room temperature, and the length after heating was measured.
- the test length after heating was defined as (l 1 ) and substituted into the following formula (vii) to obtain the heat shrinkage rate.
- Heat shrinkage rate (%) ⁇ (l 0 ⁇ l 1 )/l 0 ⁇ 100 (vii)
- Pulse NMR (%) was measured using a pulse NMR apparatus ("the minispec mq20" manufactured by Bruker), and a test piece of the stretched polypropylene film of each prototype example and comparative example was cut with scissors and packed in a sample tube. Measured under conditions. Values of 1.76 to 2.00 were used for the Weibull coefficient W H , and a value of 1 was used for W M and W S . The Weibull coefficient W H was used as a variable in the fitting, and measured by changing each numerical value so as to accurately match the free induction decay curve.
- ⁇ Tensile modulus> The tensile modulus (GPa) was obtained by cutting out a test piece of 15 mm width ⁇ 200 mm in the MD direction and TD direction from the stretched polypropylene film of each prototype example and comparative example, and using a tensile tester. (manufactured by A&D Co., Ltd., "RTF-1310"), in accordance with JIS K 7127 (1999), under the conditions of a chuck distance of 100 mm and a tensile speed of 200 mm / min in the MD and TD directions Tensile modulus was measured.
- Haze (%) was measured using a haze meter ("NDH-5000" manufactured by Nippon Denshoku Industries Co., Ltd.) in accordance with JIS K 7136 (2000).
- ⁇ Thickness> The thickness ( ⁇ m) of the film was measured using a thickness measuring instrument ("B-1" manufactured by Toyo Seiki Seisakusho Co., Ltd.) to obtain the total thickness ( ⁇ m).
- Prototype Examples 1 to 9 had a small dimensional change rate in the MD direction at high temperatures and a high storage elastic modulus in the TD direction, so they were excellent in rigidity and heat resistance, and had good dimensional stability. Furthermore, the film has no stretching unevenness in its appearance and is excellent in stretchability, so that the production efficiency is improved.
- the film composed only of the polypropylene resin (A) having a high mesopentad fraction of Comparative Example 1-1 was excellent in rigidity, heat resistance and dimensional stability, but had stretch unevenness and had a quality level that could be used as a product. It wasn't.
- Comparative Example 1-1 even in Comparative Examples 1-2 to 1-4 in which only the polypropylene resin (A) having a high mesopentad fraction was used and the film forming conditions were changed, uneven stretching was improved. I could't. From this, it was found that when the propylene/ ⁇ -olefin random copolymer (B) is mixed in the base material layer, the stretchability of the film can be improved and the occurrence of stretch unevenness can be suppressed.
- the base material layer is composed of a resin mixture in which a polypropylene resin (A) having a mesopentad fraction (mmmm) of 95% or more is mixed with a propylene/ ⁇ -olefin random copolymer (B). and the propylene/ ⁇ -olefin random copolymer (B) was mixed in an amount of 1 to 10% by weight with respect to 100% by weight of the resin mixture. It was shown that the stretchability can be improved to reduce the defect rate due to stretch unevenness while maintaining the stretchability and dimensional stability, and it can contribute to the efficiency of film production.
- the oriented polypropylene film of the present invention has good stretchability, heat resistance and dimensional stability while improving the rigidity of the film. That is, according to the stretched polypropylene film of the present invention, it is possible to improve the productivity of a film with stable quality while maintaining good rigidity, and it has good dimensional stability even under high temperature conditions. It can also contribute to production efficiency in subsequent processing.
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Abstract
Description
エチレン含量(mol%)=IE×100/(IE+IP+IB) ・・・(i-1)
ブテン含量(mol%)=IB×100/(IE+IP+IB) ・・・(i-2)
IE=Iδδ/2+Iγδ/4-Iββ+Iαγ(P)+Iαδ(P)+Iαγ(B)+Iαδ(B) ・・・(i-3)
IP=1/3×〔ICH3(P)+ICH(P)+Iαα(PP)+1/2×(Iαα(PB)+Iαγ(P)+Iαδ(P))〕 ・・・(i-4)
IB=1/4×〔(ICH3(B)+ICH(B)+I2B2+Iαα(BB))+1/2×(Iαα(PB)+Iαγ(B)+Iαδ(B))〕 ・・・(i-5)
Iββ=I24.8-23.3
Iγδ=I30.0-29.6
Iδδ=I29.6-29.2
Iαγ(P)+Iαδ(P)=I38.5-37.2
Iαγ(B)+Iαδ(B)=I34.5-33.5
ICH3(P)=I22.6-18.0
ICH(P)=I29.2-27.9+I31.1-30.0+I33.5-32.2
Iαα(PP)=I48.0-44.8
ICH3(B)=I11.5-9.0
ICH(B)=I35.4-34.5+I37.1-36.5+I39.5-38.8
Iαα(BB)=I40.2-39.5
Iαα(PB)=I43.7-41.6
I2B2=I26.9-26.0
A(t)=A(0)H×exp{-(t/T2H)WH}+A(0)M×exp{-(t/T2M)WM}+A(0)S×exp{-(t/T2S)WS} ・・・(ii)
F(H)={A(0)H/(A(0)H+A(0)M+A(0)S)}×100 ・・・(iii)
F(M)={A(0)M/(A(0)H+A(0)M+A(0)S)}×100 ・・・(iv)
F(S)={A(0)S/(A(0)H+A(0)M+A(0)S)}×100 ・・・(v)
t:取り込み時間
A(t):取り込み時間tにおける信号強度
A(0)H:(H)成分の信号強度の初期値(x軸が0におけるy軸の値)
A(0)M:(M)成分の信号強度の初期値(x軸が0におけるy軸の値)
A(0)S:(S)成分の信号強度の初期値(x軸が0におけるy軸の値)
T2H:(H)成分の緩和時間T2
T2M:(M)成分の緩和時間T2
T2S:(S)成分の緩和時間T2
WH:(H)成分のワイブル係数
WM:(M)成分のワイブル係数
WS:(S)成分のワイブル係数
FH:(H)成分の成分比率
FM:(M)成分の成分比率
FS:(S)成分の成分比率
発明者は、延伸ポリプロピレンフィルムを作成するため、下記の材料を用いた。
・樹脂PP-1:日本ポリプロ株式会社製、ポリプロピレン樹脂「FL1105F」、メソペンタッド分率(mmmm)=96.1%、MFR=3.5g/10min、Tm=166℃、Mw/Mn=4.9
・樹脂PP-2:株式会社プライムポリマー製、ポリプロピレン樹脂「F133A」、メソペンタッド分率(mmmm)=96.0%、MFR=3.0g/10min、Tm=166℃、Mw/Mn=4.8
・樹脂PP-3:日本ポリプロ株式会社製、ポリプロピレン樹脂「FL100A」、メソペンタッド分率(mmmm)=91.0%、MFR=3.0g/10min、Tm=163℃、Mw/Mn=5.4
・樹脂PP-4:三井化学株式会社製、プロピレン・α-オレフィンランダム共重合体「PN2060」、MFR=6.0g/10min、Tm=162℃、Mw/Mn=2.2、エチレン含有量11.4mol%、ブテン含有量7.1mol%
・樹脂PP-5:三井化学株式会社製、プロピレン・α-オレフィンランダム共重合体「PN3560」、MFR=6.0g/10min、Tm=162℃、Mw/Mn=2.2、エチレン含有量10.5mol%、ブテン含有量16.1mol%
・樹脂PP-6:日本ポリプロ株式会社製、プロピレン・α-オレフィンランダム共重合体「FW4BA」、MFR=7.0g/10min、Tm=138℃、Mw/Mn=5.2、エチレン含有量2.8mol%、ブテン含有量2.8mol%
・樹脂PP-7:日本ポリプロ株式会社製、プロピレン・α-オレフィンランダム共重合体「FX4EA」、MFR=5.5g/10min、Tm=131℃、Mw/Mn=5.0、エチレン含有量1.3mol%、ブテン含有量5.1mol%
・樹脂PP-8:三井化学株式会社製、プロピレン・α-オレフィンランダム共重合体「XM-7070」MFR=7.0g/10min、Tm=75℃、Mw/Mn=2.0、エチレン含有量0mol%、ブテン含有量26.4mol%
添加剤として帯電防止剤のマスターバッチ(樹脂PP-9)を用いた。樹脂PP-3をベースとし、帯電防止剤の濃度が9%となるよう調製した。
<メソペンタッド分率>
FT-NMR装置(株式会社JEOL RESONANCE社製、「JNM-ECA400」)を用い、13C-NMR測定を行った。試料120mgに重水素化オルトジクロロベンゼン:重ベンゼン=8:2(体積比)の混合液0.6mLを加え、135℃に加温して溶解し、135℃で測定した。メソペンタッド分率は、「Zambelliら、Macromolecules,第6巻,925頁(1973)」に記載の方法によって算出し、ピークの帰属に関しては、「Macromolecules、8巻、687頁(1975)」に記載の上記文献の訂正版に基づいて行った。
観測核:13C(100MHz)
測定モード:シングルパルスプロトンブロードバンドデカップリング
パルス間隔:5秒
パルス幅:45°
シフト基準:溶媒由来シグナル=132.39ppm
積算回数:11,000回
FT-NMR装置(株式会社JEOL RESONANCE社製、「JNM-ECA400」)を用い、13C-NMR測定を行った。試料120mgに重水素化オルトジクロロベンゼン:重ベンゼン=8:2(体積比)の混合液0.6mLを加え、135℃に加温して溶解し、135℃で測定した。エチレン、ブテン含有量の算出方法については、前述のとおり、得られた各積分強度を式(i-3)、(i-4)、(i-5)に代入して求めた。
観測核:13C(100MHz)
測定モード:シングルパルスプロトンブロードバンドデカップリング
パルス間隔:5秒
パルス幅:45°
シフト基準:溶媒由来シグナル=132.39ppm
積算回数:11,000回
融解温度は、JIS K 7121(2012)に準拠して測定した示差走査熱量測定(DSC)によって求めた。セイコーインスツル株式会社製、「DSC6200」を使用して測定した(単位:℃)
メルトフローレート(MFR)の測定は、JIS K 7210-1(2014)のA法に準拠して測定した。
分子量及び分子量分布は、東ソー株式会社社製、「HLC-8321GPC-HT」を用いて下記条件にて測定した。
カラム:TSKgel GMHHR-H(20)HT×3本
(7.8mm I.D.×300mm×3本)
溶離液:1,2,4-トリクロロベンゼン(0.05% BHT添加)
流量:1.0mL/分
検出器:RI検出器(ポラリティー:-)
カラム温度:140℃
注入量:300μL
分子量標準:標準ポリスチレン
<試作例1>
基材層をポリプロピレン樹脂(A)として樹脂PP-1を95重量%、プロピレン・α-オレフィンランダム共重合体(B)として樹脂PP-4を5重量%の組成としてドライブレンドし、第一表層及び第二表層に用いる樹脂としては樹脂PP-3を用いた。3台の押出機にそれぞれ投入し、第一表層/基材層/第二表層の順に積層されるようにし、240℃に設定した3層Tダイから共押出し、30℃の冷却ロールに接触させ、そのまま30℃の水浴に投入し、原反シートを得た。その後、該シートを設定温度135℃で予熱し、MD方向に5倍に延伸した後、140℃でアニールした。次にテンターにて設定温度182℃で予熱し、延伸温度163℃でTD方向に8倍延伸を行い、ついでリラックスを6.5%させながら170℃にてアニールした。その後、片面にコロナ放電処理を施した後、巻取機で巻き取ることによって試作例1の延伸ポリプロピレンフィルムを得た。
基材層をポリプロピレン樹脂(A)として樹脂PP-1を87重量%、プロピレン・α-オレフィンランダム共重合体(B)として樹脂PP-4を3重量%、帯電防止剤マスターバッチとして樹脂PP-9を10重量%の組成とした以外は試作例1と同様とし、試作例2の延伸ポリプロピレンフィルムを得た。
基材層をポリプロピレン樹脂(A)として樹脂PP-1を84重量%、プロピレン・α-オレフィンランダム共重合体(B)として樹脂PP-4を6重量%、帯電防止剤マスターバッチとして樹脂PP-9を10重量%の組成とし、TD方向の倍率を8.7倍、リラックスを9.0%とした以外は試作例2と同様とし、試作例3の延伸ポリプロピレンフィルムを得た。
基材層をポリプロピレン樹脂(A)として樹脂PP-1を87重量%、プロピレン・α-オレフィンランダム共重合体(B)として樹脂PP-5を3重量%、帯電防止剤マスターバッチとして樹脂PP-9を10重量%の組成とし、TD方向の予熱温度を184℃とした以外は試作例2と同様とし、試作例4の延伸ポリプロピレンフィルムを得た。
基材層をポリプロピレン樹脂(A)として樹脂PP-1を84重量%、プロピレン・α-オレフィンランダム共重合体(B)として樹脂PP-6を6重量%、帯電防止剤マスターバッチとして樹脂PP-9を10重量%の組成とし、TD方向の予熱温度を183℃とした以外は試作例2と同様とし、試作例5の延伸ポリプロピレンフィルムを得た。
基材層をポリプロピレン樹脂(A)として樹脂PP-1を81重量%、プロピレン・α-オレフィンランダム共重合体(B)として樹脂PP-6を9重量%、帯電防止剤マスターバッチとして樹脂PP-9を10重量%の組成とし、TD方向の予熱温度を183℃とした以外は試作例3と同様とし、試作例6の延伸ポリプロピレンフィルムを得た。
基材層をポリプロピレン樹脂(A)として樹脂PP-1を84重量%、プロピレン・α-オレフィンランダム共重合体(B)として樹脂PP-7を6重量%、帯電防止剤マスターバッチとして樹脂PP-9を10重量%の組成とした以外は試作例2と同様とし、試作例7の延伸ポリプロピレンフィルムを得た。
基材層をポリプロピレン樹脂(A)として樹脂PP-1を84重量%、プロピレン・α-オレフィンランダム共重合体(B)として樹脂PP-8を6重量%、帯電防止剤マスターバッチとして樹脂PP-9を10重量%の組成とした以外は試作例2と同様とし、試作例8の延伸ポリプロピレンフィルムを得た。
基材層をポリプロピレン樹脂(A)として樹脂PP-2を87重量%、プロピレン・α-オレフィンランダム共重合体(B)として樹脂PP-4を3重量%、帯電防止剤マスターバッチとして樹脂PP-9を10重量%の組成とした以外は試作例2と同様とし、試作例9の延伸ポリプロピレンフィルムを得た。
基材層をポリプロピレン樹脂(A)として樹脂PP-1を79重量%、プロピレン・α-オレフィンランダム共重合体(B)として樹脂PP-4を11重量%、帯電防止剤マスターバッチとして樹脂PP-9を10重量%の組成とし、TD方向の予熱温度を183℃、TD方向の倍率を8.7倍、リラックスを9.0%とした以外は試作例2と同様とし、試作例10の延伸ポリプロピレンフィルムを得た。
基材層をポリプロピレン樹脂(A)として樹脂PP-1を78重量%、プロピレン・α-オレフィンランダム共重合体(B)として樹脂PP-6を12重量%、帯電防止剤マスターバッチとして樹脂PP-9を10重量%の組成とした以外は試作例10と同様とし、試作例10の延伸ポリプロピレンフィルムを得た。
基材層をポリプロピレン樹脂(A)として樹脂PP-1を100重量%とし、TD方向の延伸温度を165℃、TD方向のアニール温度を168℃とした以外は試作例1と同様とし、比較例1-1の延伸ポリプロピレンフィルムを得た。
TD方向の予熱温度を185℃、TD方向の延伸温度を163℃とした以外は比較例1-1と同様とし、比較例1-2の延伸ポリプロピレンフィルムを得た。
TD方向の予熱温度を180℃、TD方向の延伸温度を165℃とした以外は比較例1-1と同様とし、比較例1-3の延伸ポリプロピレンフィルムを得た。
TD方向の予熱温度を178℃、TD方向の延伸温度を168℃とした以外は比較例1-1と同様とし、比較例1-4の延伸ポリプロピレンフィルムを得た。
基材層をポリプロピレン樹脂(A)として樹脂PP-3を100重量%とし、TD方向の予熱温度を181℃、TD方向の延伸温度を164℃、TD方向のアニール温度を168℃とした以外は試作例1と同様とし、比較例2の延伸ポリプロピレンフィルムを得た。
基材層をポリプロピレン樹脂(A)として樹脂PP-3を90重量%、帯電防止剤マスターバッチとして樹脂PP-9を10重量%の組成とし、TD方向の予熱温度を181℃、TD方向の延伸温度を164℃、TD方向のアニール温度を168℃とした以外は試作例1と同様とし、比較例3の延伸ポリプロピレンフィルムを得た。
各試作例及び比較例の延伸ポリプロピレンフィルムの評価のため、寸法変化率、貯蔵弾性率、加熱収縮率、パルスNMR、引張弾性率及びヘーズを測定した。併せて、各フィルムの厚みを測定し、目視でフィルムの外観を評価した。結果を表4~6にまとめた。なお、比較例1-2~1-4は、作成時の延伸斑がひどく、各種測定のうち、一部測定を行うことができなかったため、表中の記載を省略した。比較例1-2は、延伸斑が生じるとともに、白化して透明性が低下した。比較例1-3は、延伸斑がさらに悪化した。比較例1-4は、延伸斑が比較例1-3と同程度であった。
寸法変化率(%)は、TMA測定の装置として熱機械測定装置(ティー・エイ・インスツルメント・ジャパン株式会社製、「型番:Q400」)を使用して測定した。各試作例及び比較例の延伸ポリプロピレンフィルムを8mm×4mmの大きさの試験片に裁断し、該試験片のMD方向を引張方向として、TMA装置のプローブに固定し、試験片に0.32Nの荷重を加えられ当初時点の試験片の長さ(L0)を読み取る。昇温速度5℃/minで30℃から150℃まで加熱させ、140℃加熱後の試験片の長さ(L1)を読み取る。一連の加熱中、試験片には0.32Nの荷重は試験片のMD方向に加えられている。そして、加熱前後の試験片の長さ(L0)と(L1)を下記式(vi)に代入し、当初の試験片の長さと変化量との関係から寸法変化率(%)を算出する。なお、比較例2の延伸ポリプロピレンフィルムは、試験片が140℃に到達する前に測定限界まで伸びてしまい、寸法変化率の算出ができなかったため、測定不可とし、表中「-」と表記した。この時、測定限界時の伸び(L1)から算出した寸法変化率は43.4%であった。
寸法変化率(%)={(L1-L0)/L0}×100 ・・・(vi)
貯蔵弾性率(MPa)は、アイティー計測制御社製、「DVA-225」を用い、下記条件にて120℃及び140℃それぞれにおけるTD方向の貯蔵弾性率を測定した。
変形モード:引張
温度範囲:-60℃~150℃
昇温速度:3℃/min
周波数:1Hz
環境:Air下
加熱収縮率(%)は、JIS Z 1712(2009)に準拠して測定した。各試作例及び比較例の延伸ポリプロピレンフィルムからTD方向15mm、MD方向200mmの試験片を切り出し、両端から50mmの位置に印をつけ加熱前の試験長さ(l0)とし、150℃の熱風オーブン中に吊るして5分間加熱した。その後、取り出して室温で冷却し、加熱後の長さを測定した。加熱後の試験長さを(l1)とし、下記式(vii)に代入して加熱収縮率を求めた。
加熱収縮率(%)={(l0-l1)/l0}×100 ・・・(vii)
パルスNMR(%)は、パルスNMR装置(Bruker社製、「the minispec mq20」)を用い、各試作例及び比較例の延伸ポリプロピレンフィルムの試験片をハサミで裁断して試料管に詰め、下記の条件で測定した。ワイブル係数WHは1.76~2.00の値を使用し、WM及びWSは1の値を使用した。ワイブル係数WHはフィッティングにおいて変数とし、自由誘導減衰曲線と精度よく一致するようそれぞれ数値を変更して測定した。
観測核:1H(共鳴周波数:20MHz)
測定温度:70℃
測定法:Solid Echo法
90°パルス幅:3.26μs
パルス間隔:0.008ms
取り込み時間:2ms
繰り返し時間:1s
積算回数:1024回
引張弾性率(GPa)は、各試作例及び比較例の延伸ポリプロピレンフィルムを、そのMD方向及びTD方向のそれぞれについて、試験方向長さ15mm幅×200mmの試験片を切り出し試験片とし、引張試験機(株式会社エー・アンド・デイ製、「RTF-1310」)を使用し、JIS K 7127(1999)に準拠し、チャック間距離100mm、引張速度200mm/minの条件にてMD方向及びTD方向における引張弾性率を測定した。
ヘーズ(%)は、JIS K 7136(2000)に準拠し、ヘーズメーター(日本電色工業株式会社製、「NDH-5000」)を使用して測定した。
フィルムの厚み(μm)は、厚さ測定器(株式会社東洋精機製作所製,「B-1」)を用い測定して全層厚さ(μm)を求めた。
フィルムの外観は、下記の基準で目視評価した。延伸斑がほとんどなく、外観が良いものを「〇」、延伸斑があり、外観が悪いものを「×」と評価した。
試作例1~9は高温におけるMD方向の寸法変化率が小さく、TD方向における貯蔵弾性率が高いため、剛性、耐熱性に優れるとともに、寸法安定性も良好となった。さらに、フィルム外観においても延伸斑がなく、延伸性にも優れるため、生産効率も良好となる。
Claims (6)
- 基材層と該基材層の一面又は両面に積層された表層からなり、
熱機械測定装置(TMA)にて測定した30℃から150℃まで5℃/分で昇温、荷重0.32Nを加えた際のMD方向の140℃における寸法変化率が30%以下であり、かつ、
動的粘弾性測定によって昇温速度3℃/min、周波数1.0Hzで測定した120℃におけるTD方向の貯蔵弾性率(E’)が600MPa以上及び140℃におけるTD方向の貯蔵弾性率(E’)が300MPa以上であることを満たす積層フィルムであって、
前記基材層は、メソペンタッド分率(mmmm)が95%以上であるポリプロピレン樹脂(A)にプロピレン・α-オレフィンランダム共重合体(B)が混合された少なくとも2種類以上の異なる樹脂混合体により構成され、
前記プロピレン・α-オレフィンランダム共重合体(B)は、前記樹脂混合体100重量%に対して1~10重量%混合されてなる
ことを特徴とする延伸ポリプロピレンフィルム - 前記プロピレン・α-オレフィンランダム共重合体(B)が、プロピレン・エチレン・1-ブテンランダム共重合体、プロピレン・エチレンランダム共重合体、プロピレン・1-ブテンランダム共重合体の中から選ばれる少なくとも1種類である請求項1に記載の延伸ポリプロピレンフィルム。
- 前記プロピレン・α-オレフィンランダム共重合体(B)が、プロピレン・エチレン・1-ブテンランダム共重合体である請求項2に記載の延伸ポリプロピレンフィルム
- 前記プロピレン・エチレン・1-ブテンランダム共重合体のエチレン含有量が5~15mol%、ブテン含有量が5~20mol%である請求項3に記載の延伸ポリプロピレンフィルム。
- 前記積層フィルムが、150℃・5分の加熱処理におけるMD方向及びTD方向の加熱収縮率がそれぞれ6.5%以下である請求項1ないし4のいずれか1項に記載の延伸ポリプロピレンフィルム。
- 前記積層フィルムが、パルスNMRのソリッドエコー法による測定において、70℃における自由誘導減衰曲線を3成分近似した場合の最も運動性の低い結晶成分(H)の成分量が55~70%であり、最も運動性の高い非晶成分(S)の成分量が5~11%である請求項1ないし5のいずれか1項に記載の延伸ポリプロピレンフィルム。
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JP2019163358A (ja) * | 2018-03-19 | 2019-09-26 | 日本ポリプロ株式会社 | ポリプロピレン系樹脂組成物、それからなる積層体及び二軸延伸ポリプロピレンフィルム |
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JP2019163358A (ja) * | 2018-03-19 | 2019-09-26 | 日本ポリプロ株式会社 | ポリプロピレン系樹脂組成物、それからなる積層体及び二軸延伸ポリプロピレンフィルム |
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