WO2010079799A1 - 微多孔膜形成用ポリプロピレン樹脂組成物 - Google Patents
微多孔膜形成用ポリプロピレン樹脂組成物 Download PDFInfo
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- WO2010079799A1 WO2010079799A1 PCT/JP2010/050090 JP2010050090W WO2010079799A1 WO 2010079799 A1 WO2010079799 A1 WO 2010079799A1 JP 2010050090 W JP2010050090 W JP 2010050090W WO 2010079799 A1 WO2010079799 A1 WO 2010079799A1
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- WIPO (PCT)
- Prior art keywords
- resin composition
- polypropylene resin
- group
- temperature
- microporous film
- Prior art date
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- -1 Polypropylene Polymers 0.000 title claims abstract description 108
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- 238000010828 elution Methods 0.000 claims abstract description 24
- 238000002844 melting Methods 0.000 claims abstract description 16
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- 239000012982 microporous membrane Substances 0.000 claims description 27
- NNBZCPXTIHJBJL-UHFFFAOYSA-N decalin Chemical compound C1CCCC2CCCCC21 NNBZCPXTIHJBJL-UHFFFAOYSA-N 0.000 claims description 18
- 239000012528 membrane Substances 0.000 claims description 18
- RFFLAFLAYFXFSW-UHFFFAOYSA-N 1,2-dichlorobenzene Chemical compound ClC1=CC=CC=C1Cl RFFLAFLAYFXFSW-UHFFFAOYSA-N 0.000 claims description 15
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- PXXNTAGJWPJAGM-UHFFFAOYSA-N vertaline Natural products C1C2C=3C=C(OC)C(OC)=CC=3OC(C=C3)=CC=C3CCC(=O)OC1CC1N2CCCC1 PXXNTAGJWPJAGM-UHFFFAOYSA-N 0.000 claims description 9
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- 229910001416 lithium ion Inorganic materials 0.000 claims description 3
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 abstract description 38
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- JWCYDYZLEAQGJJ-UHFFFAOYSA-N dicyclopentyl(dimethoxy)silane Chemical compound C1CCCC1[Si](OC)(OC)C1CCCC1 JWCYDYZLEAQGJJ-UHFFFAOYSA-N 0.000 description 6
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- DEKYCKZXEQLEEJ-UHFFFAOYSA-N bis(2,3-dimethylcyclopentyl)-dimethoxysilane Chemical compound C1CC(C)C(C)C1[Si](OC)(OC)C1CCC(C)C1C DEKYCKZXEQLEEJ-UHFFFAOYSA-N 0.000 description 1
- DNOZBDGJLZXQIQ-UHFFFAOYSA-N bis(2,5-dimethylcyclopent-3-en-1-yl)-dimethoxysilane Chemical compound CC1C=CC(C)C1[Si](OC)(OC)C1C(C)C=CC1C DNOZBDGJLZXQIQ-UHFFFAOYSA-N 0.000 description 1
- YKZRAEIJLNNNSM-UHFFFAOYSA-N bis(2,5-dimethylcyclopenta-2,4-dien-1-yl)-dimethoxysilane Chemical compound CC1=CC=C(C)C1[Si](OC)(OC)C1C(C)=CC=C1C YKZRAEIJLNNNSM-UHFFFAOYSA-N 0.000 description 1
- BSFTTXIBGVMKCF-UHFFFAOYSA-N bis(2,5-dimethylcyclopentyl)-dimethoxysilane Chemical compound CC1CCC(C)C1[Si](OC)(OC)C1C(C)CCC1C BSFTTXIBGVMKCF-UHFFFAOYSA-N 0.000 description 1
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- FQYDKXZVLQHDPJ-UHFFFAOYSA-N cyclopentylmethoxy-bis(2,5-dimethylcyclopentyl)silane Chemical compound CC1C(C(CC1)C)[SiH](OCC1CCCC1)C1C(CCC1C)C FQYDKXZVLQHDPJ-UHFFFAOYSA-N 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- VVXWGMCRFPITIH-UHFFFAOYSA-N di(cyclopent-3-en-1-yl)-dimethoxysilane Chemical compound C1C=CCC1[Si](OC)(OC)C1CC=CC1 VVXWGMCRFPITIH-UHFFFAOYSA-N 0.000 description 1
- YZDFSKMSVNGTNQ-UHFFFAOYSA-N di(cyclopenta-2,4-dien-1-yl)-dimethoxysilane Chemical compound C1=CC=CC1[Si](OC)(OC)C1C=CC=C1 YZDFSKMSVNGTNQ-UHFFFAOYSA-N 0.000 description 1
- FVAXOELGJXMINU-UHFFFAOYSA-N dicyclopentyl(diethoxy)silane Chemical compound C1CCCC1[Si](OCC)(OCC)C1CCCC1 FVAXOELGJXMINU-UHFFFAOYSA-N 0.000 description 1
- QCSFOFAKBQNZET-UHFFFAOYSA-N dicyclopentyl-ethyl-methoxysilane Chemical compound C1CCCC1[Si](OC)(CC)C1CCCC1 QCSFOFAKBQNZET-UHFFFAOYSA-N 0.000 description 1
- RUHGCFSYBXWPNF-UHFFFAOYSA-N dicyclopentylmethyl(ethoxy)silane Chemical compound C1CCCC1C([SiH2]OCC)C1CCCC1 RUHGCFSYBXWPNF-UHFFFAOYSA-N 0.000 description 1
- WVEWXPQUQZKPJK-UHFFFAOYSA-N dicyclopentylmethyl(methoxy)silane Chemical compound C1CCCC1C([SiH2]OC)C1CCCC1 WVEWXPQUQZKPJK-UHFFFAOYSA-N 0.000 description 1
- OSZVQUZIQCJAPJ-UHFFFAOYSA-N dimethoxy-bis(2-methylcyclopentyl)silane Chemical compound C1CCC(C)C1[Si](OC)(OC)C1CCCC1C OSZVQUZIQCJAPJ-UHFFFAOYSA-N 0.000 description 1
- 239000003480 eluent Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 125000003983 fluorenyl group Chemical group C1(=CC=CC=2C3=CC=CC=C3CC12)* 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 1
- 238000012685 gas phase polymerization Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 150000008282 halocarbons Chemical class 0.000 description 1
- 238000011899 heat drying method Methods 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 239000005457 ice water Substances 0.000 description 1
- 125000003392 indanyl group Chemical group C1(CCC2=CC=CC=C12)* 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 159000000003 magnesium salts Chemical class 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 229920001526 metallocene linear low density polyethylene Polymers 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 239000011806 microball Substances 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- GOQYKNQRPGWPLP-UHFFFAOYSA-N n-heptadecyl alcohol Natural products CCCCCCCCCCCCCCCCCO GOQYKNQRPGWPLP-UHFFFAOYSA-N 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 125000002734 organomagnesium group Chemical group 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000012488 sample solution Substances 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000010558 suspension polymerization method Methods 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- LIHXHWFWAARKCG-UHFFFAOYSA-N tricyclopentyl(ethoxy)silane Chemical compound C1CCCC1[Si](C1CCCC1)(OCC)C1CCCC1 LIHXHWFWAARKCG-UHFFFAOYSA-N 0.000 description 1
- PTCWADDVLPYBBZ-UHFFFAOYSA-N tricyclopentylmethoxysilane Chemical compound C1CCCC1C(C1CCCC1)(O[SiH3])C1CCCC1 PTCWADDVLPYBBZ-UHFFFAOYSA-N 0.000 description 1
- IOPAQHDEQBHWEB-UHFFFAOYSA-N trimethoxy-(2-methylcyclopentyl)silane Chemical compound CO[Si](OC)(OC)C1CCCC1C IOPAQHDEQBHWEB-UHFFFAOYSA-N 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0002—Organic membrane manufacture
- B01D67/002—Organic membrane manufacture from melts
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0002—Organic membrane manufacture
- B01D67/0023—Organic membrane manufacture by inducing porosity into non porous precursor membranes
- B01D67/0025—Organic membrane manufacture by inducing porosity into non porous precursor membranes by mechanical treatment, e.g. pore-stretching
- B01D67/0027—Organic membrane manufacture by inducing porosity into non porous precursor membranes by mechanical treatment, e.g. pore-stretching by stretching
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0002—Organic membrane manufacture
- B01D67/0023—Organic membrane manufacture by inducing porosity into non porous precursor membranes
- B01D67/003—Organic membrane manufacture by inducing porosity into non porous precursor membranes by selective elimination of components, e.g. by leaching
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/26—Polyalkenes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/26—Polyalkenes
- B01D71/262—Polypropylene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F110/00—Homopolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F110/04—Monomers containing three or four carbon atoms
- C08F110/06—Propene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/26—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a solid phase from a macromolecular composition or article, e.g. leaching out
-
- 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
- C08L23/04—Homopolymers or copolymers of ethene
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/52—Separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/02—Diaphragms; Separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
- H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M50/417—Polyolefins
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
- H01M50/491—Porosity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2323/00—Details relating to membrane preparation
- B01D2323/06—Specific viscosities of materials involved
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2323/00—Details relating to membrane preparation
- B01D2323/12—Specific ratios of components used
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/22—Thermal or heat-resistance properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/32—Melting point or glass-transition temperatures
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/13—Energy storage using capacitors
Definitions
- the present invention relates to a polypropylene resin composition for forming a microporous film, which contains an ultrahigh molecular weight propylene homopolymer and is excellent in heat resistance and strength.
- Microporous membranes formed from polymer materials are used in various applications such as medical and industrial filtration membranes, separation membranes, separators for battery separators, capacitor separators, and the like.
- Patent Document 1 describes a high molecular weight PP with MFR ⁇ 1.2 g / 10 min, but the effect is not clear because there is no verification data in the examples.
- Patent Document 3 describes a microporous membrane (separator) using polyolefins having different viscosity average molecular weights, but only PE is used as a high molecular weight product, and physical properties as a separator are described. It has not been.
- Patent Document 4 describes a microporous membrane (separator) using polyolefin, particularly metallocene PE, having a residual Cl content of 5 ppm or less and a viscosity average molecular weight of 1 million or more. Some desired physical properties (for example, 150 ° C. puncture strength) cannot be obtained.
- Patent Document 5 discloses a microporous membrane composed of PE having a viscosity average molecular weight (Mv) of 300,000 ⁇ Mv ⁇ 600,000, 600,000 ⁇ Mv ⁇ 10 million, and PP (150,000 ⁇ Mv ⁇ 700,000). Although (separator) is described, desired physical properties (for example, thermal film breaking temperature) as a separator cannot be obtained.
- Mv viscosity average molecular weight
- Patent Document 7 describes a microporous membrane (separator) composed of two types of polyolefins having a weight average molecular weight (Mw) of 500,000 or more, but all examples are HDPE, and desired heat resistance is obtained. I can't.
- JP 2007-311332 A Japanese Patent No. 3852492 JP 2007-070609 A JP 2005-225919 A Japanese Patent No. 399467 JP 20041966871 A International Publication No. 00/49074 Pamphlet
- an object of the present invention is to provide a polypropylene resin composition for forming a microporous film that contains an ultrahigh molecular weight propylene homopolymer and is excellent in heat resistance and strength.
- the polypropylene resin composition for forming a microporous film according to the present invention is characterized in that an ultrahigh molecular weight propylene homopolymer (A) satisfying the following requirements (1) to (4) is an essential component.
- A ultrahigh molecular weight propylene homopolymer
- the intrinsic viscosity [ ⁇ ] measured using a decalin solution is 7 dl / g or more and less than 25 dl / g.
- the mesopentad fraction measured by 13 C-NMR (nuclear magnetic resonance method) is in the range of 90.0 to 99.5%.
- the melting point measured by a differential scanning calorimeter (DSC) is 153-167 ° C.
- the polypropylene resin composition for forming a microporous film according to the present invention preferably further contains at least one material selected from the group consisting of plasticizers, polyolefins other than polypropylene, and inorganic powders.
- the polypropylene resin composition for forming a microporous membrane according to the present invention is preferably used in one type selected from the group consisting of a separator, a filtration membrane, a separation membrane, and a filter.
- the separator is a battery separator or a capacitor separator, and the battery separator is particularly preferably a lithium ion secondary battery separator. More preferably, the separation membrane is a medical separation membrane.
- the polypropylene resin composition for forming a microporous film of the present invention contains a propylene homopolymer (A) that satisfies specific requirements, it can form a microporous film having excellent heat resistance and strength.
- the polypropylene resin composition for forming a microporous film according to the present invention is characterized in that an ultrahigh molecular weight propylene homopolymer (A) satisfying the following requirements (1) to (4) is an essential component.
- A ultrahigh molecular weight propylene homopolymer
- the intrinsic viscosity [ ⁇ ] measured using a decalin solution is 7 dl / g or more and less than 25 dl / g.
- the mesopentad fraction measured by 13 C-NMR (nuclear magnetic resonance method) is in the range of 90.0 to 99.5%.
- the melting point measured by a differential scanning calorimeter (DSC) is 153-167 ° C.
- the content of the ultrahigh molecular weight propylene homopolymer (A) is preferably 1 to 100% by mass, and preferably 5 to 80% by mass. Is more preferably 10 to 60% by mass.
- the said ultra high molecular weight propylene homopolymer (A) when content of the said ultra high molecular weight propylene homopolymer (A) is 100 mass%, although it cannot be said to be a composition substantially, in this invention, the said ultra high molecular weight propylene homopolymer (A ) Is defined as a composition even when the content is 100% by mass.
- the finally formed microporous film tends to be excellent in heat resistance and strength.
- the ultra high molecular weight propylene homopolymer (A) used in the present invention has an intrinsic viscosity [ ⁇ ] measured using a decalin solution of 7 dl / g or more and less than 25 dl / g, preferably 7.2 dl / g or more and 22 dl. / G, more preferably 7.4 dl / g or more and less than 21 dl / g.
- a polymer having an intrinsic viscosity [ ⁇ ] within the above range can be obtained by using a Ziegler-based catalyst described later suitable for this purpose and appropriately adjusting the polymerization conditions such as the amount of the catalyst added. For example, the intrinsic viscosity [ ⁇ ] can be increased by increasing the amount of catalyst added.
- the intrinsic viscosity [ ⁇ ] is less than 7 dl / g, the molecular entanglement is small and a microporous film having a desired strength cannot be obtained. If it is 25 dl / g or more, stretching is difficult and a desired microporous film cannot be obtained.
- the ultrahigh molecular weight propylene homopolymer (A) used in the present invention has a mesopentad fraction measured by 13 C-NMR of 90.0 to 99.5%, preferably 93.5 to 99.5%, more preferably Is in the range of 94.0-99.5%.
- the mesopentad fraction (mmmm fraction) indicates the proportion of isotactic chains existing in pentad units in the molecular chain, and the propylene monomer units in the center of a chain in which five propylene monomer units are continuously meso-bonded. Is a fraction of.
- a Ziegler catalyst or donor suitable for this purpose a polymer having a mesopentad fraction within the above range can be obtained. Further, the mesopentad fraction can be adjusted by changing the polymerization temperature.
- the resulting microporous film is excellent in heat resistance and strength.
- the ultrahigh molecular weight propylene homopolymer (A) used in the present invention has a melting point measured by DSC of 153 to 167 ° C., preferably 160 to 166 ° C.
- a polymer having a melting point within the above range can be obtained by using a Ziegler-based catalyst described later suitable for this purpose.
- the melting point of the ultrahigh molecular weight propylene homopolymer (A) is within the above range, the resulting microporous membrane is excellent in heat resistance.
- the ultrahigh molecular weight propylene homopolymer (A) used in the present invention has a peak top temperature of 116 to 125 in the elution temperature-elution amount curve by temperature-elution elution fractionation (TREF) using o-dichlorobenzene. Is present at 117 to 125 ° C., more preferably at 118 to 125 ° C., and the full width at half maximum of the peak is 7.0 ° C. or less, preferably 6.0 ° C. or less. More preferably, it is 5.5 ° C. or lower. Although the minimum of the said half value width is not specifically limited, it is 1.0 degreeC.
- the ultra-high molecular weight polypropylene means a polypropylene having a weight average molecular weight (Mw) of 1 million to 6 million, preferably 1.1 million to 5.5 million, more preferably 1.2 million to 5 million.
- a microporous film having excellent heat resistance and strength can be obtained.
- the production method of the ultrahigh molecular weight propylene homopolymer (A) used in the present invention is not limited as long as the propylene homopolymer (A) satisfies the requirements (1) to (4).
- a production method in which propylene is homopolymerized in the presence of a highly stereoregular Ziegler-Natta catalyst can be mentioned.
- Various known catalysts can be used as the highly stereoregular Ziegler-Natta catalyst.
- a solid titanium catalyst component containing magnesium, titanium, halogen and an electron donor for example, (b) an organometallic compound catalyst component, (c) a cyclopentyl group, a cyclopentenyl group, a cyclopentadienyl group and A catalyst comprising an organosilicon compound catalyst component having at least one group selected from the group consisting of these derivatives can be used.
- the solid titanium catalyst component (a) can be prepared by contacting a magnesium compound (a-1), a titanium compound (a-2) and an electron donor (a-3).
- Examples of the magnesium compound (a-1) include a magnesium compound having a reducing ability such as a magnesium compound having a magnesium-carbon bond or a magnesium-hydrogen bond, and magnesium halide, alkoxymagnesium halide, allyloxymagnesium halide, alkoxymagnesium, Examples include magnesium compounds having no reducing ability, such as allyloxymagnesium and magnesium carboxylates.
- the solid titanium catalyst component (a) it is preferable to use, for example, a tetravalent titanium compound represented by the following formula (1) as the titanium compound (a-2).
- Ti (OR) g X 4-g (1) (In the formula (1), R is a hydrocarbon group, X is a halogen atom, and g is a number of 0 ⁇ g ⁇ 4.) Specifically, titanium tetrahalides such as TiCl 4 , TiBr 4 , and TiI 4 ; Ti (OCH 3 ) Cl 3 , Ti (OC 2 H 5 ) Cl 3 , Ti (On-C 4 H 9 ) Cl 3 , Ti (OC 2 H 5 ) Br 3 , Ti (O-iso-C 4 H 9 ) Br 3 and other trihalogenated alkoxytitanium; Ti (OCH 3 ) 2 Cl 2 , Ti (OC 2 H 5 ) 2 Cl 2 , Di (halogenated dialkoxytitanium) such as Ti ( On -C 4 H 9 ) 2 Cl 2 , Ti (OC 2 H 5 ) 2 Br 2 ; Ti (OCH 3 ) 3 Cl, Ti (OC 2 H 5 ) 3 Cl, Ti (
- Examples of the electron donor (a-3) used in the preparation of the solid titanium catalyst component (a) include alcohols, phenols, ketones, aldehydes, esters of organic acids or inorganic acids, organic acid halides, ethers, acids. Examples include amides, acid anhydrides, ammonia, amines, nitriles, isocyanates, nitrogen-containing cyclic compounds, and oxygen-containing cyclic compounds.
- a carrier-supporting solid titanium catalyst component (a) can be prepared using a carrier.
- the solid titanium catalyst component (a) can be prepared by adopting any method including known methods, but a few examples will be briefly described below.
- a hydrocarbon solution of a magnesium compound (a-1) containing an electron donor (liquefaction agent) (a-3) is contacted with an organometallic compound to precipitate a solid, or while depositing A method of contact reaction with a titanium compound (a-2).
- (11) A method in which a magnesium compound (a-1), an electron donor (a-3), and a titanium compound (a-2) are contacted and reacted in an arbitrary order.
- each component may be pretreated with a reaction aid such as an electron donor (a-3), an organometallic compound, or a halogen-containing silicon compound.
- a reaction aid such as an electron donor (a-3), an organometallic compound, or a halogen-containing silicon compound.
- a solid material obtained by pulverizing a magnesium compound (a-1), a titanium compound (a-2), and an electron donor (a-3) is subjected to halogen, halogen compound or aromatic carbonization.
- a method of treatment with any of hydrogen In this method, only the magnesium compound (a-1), or a complex compound composed of the magnesium compound (a-1) and the electron donor (a-3), or the magnesium compound (a-1) and titanium is used.
- a step of pulverizing the compound (a-2) may be included. Further, after the pulverization, it may be pretreated with a reaction aid and then treated with halogen or the like. As the reaction aid, an organometallic compound or a halogen-containing silicon compound is used.
- (16) A method in which the magnesium compound (a-1) is pulverized and then contacted with the titanium compound (a-2). When the magnesium compound (a-1) is pulverized and / or contacted, the electron donor (a-3) is used together with a reaction aid as necessary.
- (17) A method of treating the compound obtained in the above (11) to (16) with a halogen, a halogen compound or an aromatic hydrocarbon.
- (18) A method in which a contact reaction product of a metal oxide, organomagnesium (a-1) and a halogen-containing compound is brought into contact with an electron donor (a-3) and preferably a titanium compound (a-2).
- Magnesium compounds (a-1) such as magnesium salts of organic acids, alkoxymagnesium and aryloxymagnesium, titanium compounds (a-2), electron donors (a-3), and optionally halogen-containing carbonization Method of contacting with hydrogen.
- a halogen-containing compound such as a halogen-containing silicon compound coexists.
- a liquid magnesium compound (a-1) having no reducing ability is reacted with an organometallic compound to precipitate a solid magnesium / metal (aluminum) complex, and then an electron donor (a- 3) A method of reacting the titanium compound (a-2).
- the organometallic compound catalyst component (b) preferably contains aluminum and / or a metal selected from Group I to Group III of the periodic table. Specifically, the organoaluminum compound (b- 1), a complex alkyl compound (b-2) of a Group I metal and aluminum, an organometallic compound (b-3) of a Group II metal or a Group III metal, and the like.
- M 1 AlR (wherein, M 1 is a Li, Na or K, R 1 is usually 1 to 15 carbon atoms (preferably 1 to 4) containing a hydrocarbon group.) Represented by A complex alkylated product of a Group I metal and aluminum (b-2).
- R 1 R 2 M 2 (wherein R 1 and R 2 are hydrocarbon groups usually containing 1 to 15 (preferably 1 to 4) carbon atoms, which may be the same or different from each other.
- M 2 is Mg, Zn or Cd.
- organoaluminum compound (b-1) examples include R 1 m Al (OR 2 ) 3-m (R 1 and R 2 are usually hydrocarbons containing 1 to 15 carbon atoms (preferably 1 to 4 carbon atoms). Which may be the same or different from each other, m is preferably a number of 1.5 ⁇ m ⁇ 3), R 1 m AlX 3-m (R 1 is a carbon atom) R 1 is usually a hydrocarbon group containing 1 to 15 (preferably 1 to 4), X is a halogen atom, and m is preferably a number 0 ⁇ m ⁇ 3.
- R 1 is a hydrocarbon group usually containing 1 to 15 (preferably 1 to 4) carbon atoms, and m is preferably a number satisfying 2 ⁇ m ⁇ 3).
- organosilicon compound catalyst component (c) examples include an organosilicon compound represented by the following formula (2).
- R 3 represents a cyclopentyl group, cyclopentenyl group, cyclopentadienyl group or a group selected from the group consisting of derivatives, R 4 and R 5 each independently represents a hydrocarbon group.
- R 3 include a cyclopentyl group, 2-methylcyclopentyl group, 3-methylcyclopentyl group, 2-ethylcyclopentyl group, 3-propylcyclopentyl group, 3-isopropylcyclopentyl group, 3 -Butylcyclopentyl group, 3-tert-butylcyclopentyl group, 2,2-dimethylcyclopentyl group, 2,3-dimethylcyclopentyl group, 2,5-dimethylcyclopentyl group, 2,2,5-trimethylcyclopentyl group, 2,3 , 4,5-tetramethylcyclopent
- hydrocarbon group represented by R 4 and R 5 examples include hydrocarbon groups such as an alkyl group, a cycloalkyl group, an aryl group, and an aralkyl group. When two or more R 4 or R 5 are present, R 4 or R 5 may be the same or different, and R 4 and R 5 may be the same or different. In the formula (2), R 3 and R 4 may be cross-linked with an alkylene group or the like.
- R 3 is a cyclopentyl group
- R 4 is an alkyl group or a cyclopentyl group
- R 5 is an alkyl group, particularly a methyl group or an ethyl group. Is preferred.
- organosilicon compound represented by the formula (2) examples include cyclopentyltrimethoxysilane, 2-methylcyclopentyltrimethoxysilane, 2,3-dimethylcyclopentyltrimethoxysilane, and 2,5-dimethylcyclopentyltrimethoxy.
- Trialkoxysilanes such as silane, cyclopentyltriethoxysilane, cyclopentenyltrimethoxysilane, 3-cyclopentenyltrimethoxysilane, 2,4-cyclopentadienyltrimethoxysilane, indenyltrimethoxysilane, fluorenyltrimethoxysilane Dicyclopentyldimethoxysilane, bis (2-methylcyclopentyl) dimethoxysilane, bis (3-tert-butylcyclopentyl) dimethoxysilane, bis (2,3-dimethylcyclopentyl) Dimethoxysilane, bis (2,5-dimethylcyclopentyl) dimethoxysilane, dicyclopentyldiethoxysilane, dicyclopentenyldimethoxysilane, di (3-cyclopentenyl) dimethoxysilane, bis (2,5-dimethyl-3-cyclopenteny
- preliminary polymerization is performed in advance. You can also.
- the olefin is polymerized in the presence of the solid titanium catalyst component (a), the organometallic compound catalyst component (b), and, if necessary, the organosilicon compound catalyst component (c).
- an ⁇ -olefin having 2 to 8 carbon atoms can be used.
- linear olefins such as ethylene, propylene, 1-butene and 1-octene; 3-methyl-1-butene, 3-methyl-1-pentene, 3-ethyl-1-pentene, 4- Methyl-1-pentene, 4-methyl-1-hexene, 4,4-dimethyl-1-hexene, 4,4-dimethyl-1-pentene, 4-ethyl-1-hexene, 3-ethyl-1-hexene, etc.
- An olefin having a branched structure can be used. These may be copolymerized.
- the prepolymerization is desirably performed so that about 0.1 to 1000 g, preferably about 0.3 to 500 g of a polymer is formed per 1 g of the solid titanium catalyst component (a). If the amount of prepolymerization is too large, the production efficiency of the polymer in the main polymerization may decrease.
- the catalyst can be used at a considerably higher concentration than the catalyst concentration in the system in the main polymerization.
- the solid titanium catalyst component (a) (or the prepolymerization catalyst) is converted to titanium atoms per liter of polymerization volume of about 0.0001 to 50 mmol, preferably about 0.001 to 10 mmol. It is desirable to use in quantity.
- the organometallic compound catalyst component (b) is desirably used in an amount of about 1 to 2000 mol, preferably about 2 to 500 mol, based on 1 mol of titanium atom in the polymerization system.
- the organosilicon compound catalyst component (c) is desirably used in an amount of about 0.001 to 50 moles, preferably about 0.01 to 20 moles per mole of metal atoms of the organometallic compound catalyst component (b).
- Polymerization may be performed by any of a gas phase polymerization method, a liquid phase polymerization method such as a solution polymerization method and a suspension polymerization method, and each stage may be performed by a separate method. Further, it may be carried out by either a continuous type or a semi-continuous type, and each stage may be divided into a plurality of polymerization vessels, for example, 2 to 10 polymerization vessels.
- the polymerization medium inert hydrocarbons may be used, or liquid propylene may be used as the polymerization medium.
- the polymerization conditions in each stage are such that the polymerization temperature is in the range of about ⁇ 50 to + 200 ° C., preferably about 20 to 100 ° C., and the polymerization pressure is atmospheric pressure to 10 MPa (gauge pressure), preferably about 0.2 to 5 MPa. It is appropriately selected within the range of (gauge pressure).
- an ultrahigh molecular weight propylene homopolymer (A) is obtained as a powder by performing post-treatment steps such as a known catalyst deactivation treatment step, a catalyst residue removal step, and a drying step as necessary.
- the polypropylene resin composition for forming a microporous film according to the present invention preferably further contains at least one material selected from the group consisting of plasticizers, polyolefins other than polypropylene, and inorganic powders.
- polypropylene resin composition for forming a microporous film of the present invention may be blended with polyethylene for the purpose of imparting functions such as shutdown characteristics.
- the polyethylene density of 925 ⁇ 970kg / m 3, preferably of 930 ⁇ 965kg / m 3 polyethylene.
- the intrinsic viscosity [ ⁇ ] measured using a polyethylene decalin solution is preferably 2 to 40 dl / g, more preferably 3 to 40 dl / g.
- the blending amount of polyethylene in the propylene resin composition containing the ultrahigh molecular weight propylene homopolymer (A) and polyethylene varies depending on the properties to be imparted, but is usually 1 to 99% by mass, preferably 10 to 95% by mass. It is.
- the polypropylene resin composition for microporous film formation concerning this invention may mix
- the amount of the plasticizer is preferably 0 to 200 parts by weight, more preferably 10 to 150 parts by weight, and more preferably 20 to 100 parts by weight with respect to 100 parts by weight of the ultrahigh molecular weight propylene homopolymer (A). More preferably, it is 100 parts by mass.
- the plasticizer is a liquid solvent at room temperature, nonane, decane, decalin, paraxylene, liquid paraffin and other aliphatic, cycloaliphatic or aromatic hydrocarbons, and mineral oil fractions with boiling points corresponding to these, room temperature
- solid solvents include stearyl alcohol and paraffin wax.
- a solvent which is liquid at room temperature is preferable, and liquid paraffin is particularly preferable.
- the polypropylene resin composition for forming a microporous film according to the present invention may be blended with an inorganic powder for the purpose of adjusting the shape and amount of pores and heat resistance.
- the inorganic powder examples include talc, clay, calcium carbonate, mica, silicates, carbonates, glass fibers, carbon fibers, and oxides and nitrides of metals such as silicon, aluminum, and titanium. Among these, metal oxides and nitrides are preferable, and silica powder is particularly preferable.
- the average particle size of the inorganic powder is desirably 0.001 to 10 ⁇ m, preferably 0.01 to 5 ⁇ m. Inorganic powder can be used individually by 1 type, and can also be used in combination of 2 or more type.
- the blending amount of the inorganic powder in 100 parts by weight of the polypropylene resin composition for forming a microporous film is preferably 1 to 80 parts by weight, and more preferably 10 to 60 parts by weight.
- melt-kneading and pelletizing are performed by melt-kneading at 170 to 280 ° C., preferably 190 to 250 ° C., and pelletizing using an ordinary single-screw extruder, twin-screw extruder, Brabender or roll.
- it can be directly formed into a sheet or film for a microporous membrane by using a conventionally known technique without pelletizing.
- the polypropylene resin composition for forming a microporous membrane according to the present invention is preferably used as one selected from the group consisting of a separator, a filtration membrane, a separation membrane and a filter.
- a separator, a filtration membrane, a separation membrane or a filter formed using the polypropylene resin composition for forming a microporous membrane is excellent in heat resistance and strength.
- the separator is a battery separator or a capacitor separator, and the battery separator is particularly preferably a lithium ion secondary battery separator. More preferably, the separation membrane is a medical separation membrane.
- the method for producing the microporous membrane includes (1) a step of individually melting and kneading the above-described polypropylene resin composition or each component, (2) a step of extruding from a die lip and cooling to form a sheet or film, and (3) a sheet. Or the process of extending
- a sheet die lip having a rectangular base shape is desirable, but a cylindrical inflation die lip or the like can also be used.
- Examples include hydrocarbons such as n-hexane and cyclohexane, halogenated hydrocarbons such as methylene chloride and carbon tetrachloride, alcohols such as ethanol and isopropanol, ethers such as diethyl ether, and ketones such as acetone. It is done.
- a heat drying method, an air drying method, or the like is used, but it is desirable to perform at a temperature that does not impair the characteristics of the microporous membrane.
- additives such as conventionally known nucleating agents ( ⁇ crystal nucleating agents such as phosphate ester metal salts and sorbitol compounds, and ⁇ crystal nucleating agents such as amide compounds), heat treatment of films, and cross-linking as necessary Processes such as treatment, surface treatment, and hydrophilization treatment may be performed.
- the present invention will be described more specifically based on examples, but the present invention is not limited to these examples.
- the measuring method of the physical property in an Example and a comparative example is as follows.
- [ ⁇ ] lim ( ⁇ sp / C) (C ⁇ 0).
- Tm Melting point (M3) Melting point (Tm)
- DSC differential scanning calorimeter
- ⁇ Create sample sheet> The sample was sandwiched between aluminum foils and press-molded under the following conditions using a mold (thickness: 0.2 mm).
- Molding temperature 240 ° C (heating temperature: 240 ° C, preheating time: 7 minutes) Press pressure: 300 kg / cm 2 Press time: 1 minute After press molding, the mold was cooled to near room temperature with ice water to obtain a sample sheet.
- First step The temperature is raised to 240 ° C. at 30 ° C./min and held for 10 minutes.
- Second step The temperature is lowered to 30 ° C. at 10 ° C./min.
- Third step The temperature is raised to 240 ° C. at 10 ° C./min.
- the separation columns were TSKgel GMH6-HT and TSKgel GMH6-HTL, the column sizes were 7.5 mm in inner diameter and 600 mm in length, respectively, and the column temperature was 140 ° C.
- the mobile phase was o-dichlorobenzene (Wako Pure Chemical Industries, Ltd.) and 0.025% by mass of BHT (Wako Pure Chemical Industries, Ltd.) as an antioxidant, which was moved at 1.0 ml / min.
- the sample concentration was 0.1% by mass, and the sample injection amount was 500 microliters.
- a differential refractometer was used as the detector.
- Standard polystyrene used was manufactured by Tosoh Corporation for molecular weights of Mw ⁇ 1000 and Mw> 4 ⁇ 10 6 , and used by Pressure Chemical Co. for 1000 ⁇ Mw ⁇ 4 ⁇ 10 6 .
- the pellets formed from the propylene homopolymer were placed in a crucible and completely burned, and the crucible was incinerated at 800 ° C. for 2 hours in an electric furnace. The ash remaining in the crucible was measured to determine the ash content (wtppm).
- Gurley air permeability The Gurley air permeability of the microporous membrane was measured according to JIS P8117.
- the maximum load when the microporous membrane was pierced at 2 mm / second using a needle having a diameter of 1 mm and 0.5 mmR was measured and converted to a thickness of 25 mm.
- the meltdown temperature When a 2 g weight was attached to the microporous membrane and the temperature was raised at 5 ° C./min, the temperature at which the microporous membrane melted and broken was defined as the meltdown temperature.
- a sample solution in which a sample (propylene homopolymer) was dissolved in o-dichlorobenzene was introduced into a TREF column (column temperature 95 ° C.) containing a filler.
- the temperature of the column was decreased to 0 ° C. at a temperature decrease rate of 0.5 ° C./min and then held for 10 minutes to crystallize the sample on the surface of the packing material.
- the temperature of the column was raised to 140 ° C. at a heating rate of 1.0 ° C./min, and the concentration of the sample (propylene homopolymer) eluted at each temperature was detected. Then, an elution temperature-elution amount curve is measured from the value of the elution amount (mass%) of the sample (propylene homopolymer) and the temperature in the column (° C.) at that time, The full width at half maximum was determined.
- Irganox 1010 1000 ppm, solid paraffin or liquid paraffin were charged into a Laboplast mill (manufactured by Toyo Seiki Seisakusho Co., Ltd.) at 250 ° C. and 20 rpm at the ratio shown in Table 2 below. And kneaded for 3 minutes. Next
- the stretched film was immersed in n-heptane at room temperature for 2 hours and then vacuum-dried at room temperature for 4 hours to remove solid paraffin or liquid paraffin to obtain a microporous membrane.
- Table 2 shows the results of measuring various physical properties of the obtained microporous membrane.
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Abstract
Description
(1)デカリン溶液を用いて測定した極限粘度[η]が7dl/g以上25dl/g未満であること。
(2)13C-NMR(核磁気共鳴法)で測定したメソペンタッド分率が90.0~99.5%の範囲にあること。
(3)示差走査熱量計(DSC)によって測定された融点が153~167℃であること。
(4)o-ジクロロベンゼンを用いた昇温溶離分別(TREF)による溶出温度-溶出量曲線において、最大ピークのピークトップ温度が116~125℃に存在し、かつ該ピークの半値幅が7.0℃以下であること。
本発明に係る微多孔膜形成用ポリプロピレン樹脂組成物は、下記要件(1)~(4)を満たす超高分子量プロピレン単独重合体(A)を必須成分とすることを特徴としている。
(1)デカリン溶液を用いて測定した極限粘度[η]が7dl/g以上25dl/g未満であること。
(2)13C-NMR(核磁気共鳴法)で測定したメソペンタッド分率が90.0~99.5%の範囲にあること。
(3)示差走査熱量計(DSC)によって測定された融点が153~167℃であること。
(4)o-ジクロロベンゼンを用いた昇温溶離分別(TREF)による溶出温度-溶出量曲線において、最大ピークのピークトップ温度が116~125℃に存在し、かつ該ピークの半値幅が7.0℃以下であること。
本発明で用いられる超高分子量プロピレン単独重合体(A)は、デカリン溶液を用いて測定した極限粘度[η]が7dl/g以上25dl/g未満であり、好ましくは7.2dl/g以上22dl/g未満であり、より好ましくは7.4dl/g以上21dl/g未満である。本目的に適した後述するチーグラー系触媒を用い、該触媒の添加量等の重合条件を適宜調整することにより、極限粘度[η]が前記範囲内にある重合体を得ることができる。例えば、触媒の添加量を多くすることにより、極限粘度[η]を大きくすることができる。
本発明で用いられる超高分子量プロピレン単独重合体(A)は、13C-NMRで測定したメソペンタッド分率が90.0~99.5%、好ましくは93.5~99.5%、より好ましくは94.0~99.5%の範囲にある。メソペンタッド分率(mmmm分率)は、分子鎖中のペンタッド単位でのアイソタクティック連鎖の存在割合を示しており、プロピレンモノマー単位が5個連続してメソ結合した連鎖の中心にあるプロピレンモノマー単位の分率である。本目的に適したチーグラー系触媒やドナーを用いることにより、メソペンタッド分率が前記範囲内にある重合体を得ることができる。また、重合温度を変更することによりメソペンタッド分率を調節することができる。
本発明で用いられる超高分子量プロピレン単独重合体(A)は、DSCによって測定された融点が153~167℃、好ましくは160~166℃の範囲にある。本目的に適した後述するチーグラー系触媒を用いることにより、融点が前記範囲内にある重合体を得ることができる。超高分子量プロピレン単独重合体(A)の融点が前記範囲内にあると、得られる微多孔膜は、耐熱性に優れる。
本発明で用いられる超高分子量プロピレン単独重合体(A)は、o-ジクロロベンゼンを用いた昇温溶離分別(TREF)による溶出温度-溶出量曲線において、最大ピークのピークトップ温度が116~125℃に存在し、好ましくは117~125℃に存在し、さらに好ましくは118~125℃に存在するとともに、該ピークの半値幅が7.0℃以下であり、好ましくは6.0℃以下であり、さらに好ましくは5.5℃以下である。前記半値幅の下限は、特に限定されないが、1.0℃である。
以下、超高分子量プロピレン単独重合体(A)の製造方法を説明する。
(式(1)中、Rは炭化水素基であり、Xはハロゲン原子であり、gは0≦g≦4の数である。)
具体的にはTiCl4、TiBr4、TiI4などのテトラハロゲン化チタン;Ti(OCH3)Cl3、Ti(OC2H5)Cl3、Ti(O-n-C4H9)Cl3、Ti(OC2H5)Br3、Ti(O-iso-C4H9)Br3などのトリハロゲン化アルコキシチタン;Ti(OCH3)2Cl2、Ti(OC2H5)2Cl2、Ti(O-n-C4H9)2Cl2、Ti(OC2H5)2Br2などのジハロゲン化ジアルコキシチタン;Ti(OCH3)3Cl、Ti(OC2H5)3Cl、Ti(O-n-C4H9)3Cl、Ti(OC2H5)3Brなどのモノハロゲン化トリアルコキシチタン;Ti(OCH3)4、Ti(OC2H5)4、Ti(O-n-C4H9)4、Ti(O-iso-C4H9)4、Ti(O-2-エチルヘキシル)4などのテトラアルコキシチタン等があげられる。
(1)電子供与体(液状化剤)(a-3)を含むマグネシウム化合物(a-1)の炭化水素溶液を、有機金属化合物と接触反応させて固体を析出させた後、または析出させながらチタン化合物(a-2)と接触反応させる方法。
(2)マグネシウム化合物(a-1)および電子供与体(a-3)からなる錯体を有機金属化合物と接触、反応させた後、チタン化合物(a-2)を接触反応させる方法。
(3)無機担体と有機マグネシウム化合物(a-1)との接触物に、チタン化合物(a-2)および電子供与体(a-3)を接触反応させる方法。この際予め接触物をハロゲン含有化合物および/または有機金属化合物と接触反応させてもよい。
(4)液状化剤および場合によっては炭化水素溶媒を含むマグネシウム化合物(a-1)溶液、電子供与体(a-3)および担体の混合物から、マグネシウム化合物(a-1)の担持された担体を得た後、次いでチタン化合物(a-2)を接触させる方法。
(5)マグネシウム化合物(a-1)、チタン化合物(a-2)、電子供与体(a-3)、場合によってはさらに炭化水素溶媒を含む溶液と、担体とを接触させる方法。
(6)液状の有機マグネシウム化合物(a-1)と、ハロゲン含有チタン化合物(a-2)とを接触させる方法。このとき電子供与体(a-3)を少なくとも1回は用いる。
(7)液状の有機マグネシウム化合物(a-1)とハロゲン含有化合物とを接触させた後、チタン化合物(a-2)を接触させる方法。この過程において電子供与体(a-3)を少なくとも1回は用いる。
(8)アルコキシ基含有マグネシウム化合物(a-1)と、ハロゲン含有チタン化合物(a-2)とを接触させる方法。このとき電子供与体(a-3)を少なくとも1回は用いる。
(9)アルコキシ基含有マグネシウム化合物(a-1)および電子供与体(a-3)からなる錯体と、チタン化合物(a-2)とを接触させる方法。
(10)アルコキシ基含有マグネシウム化合物(a-1)および電子供与体(a-3)からなる錯体を、有機金属化合物と接触させた後、チタン化合物(a-2)と接触反応させる方法。
(11)マグネシウム化合物(a-1)と、電子供与体(a-3)と、チタン化合物(a-2)とを任意の順序で接触、反応させる方法。この反応に先立って、各成分を、電子供与体(a-3)、有機金属化合物、ハロゲン含有ケイ素化合物などの反応助剤で予備処理してもよい。
(12)還元能を有さない液状のマグネシウム化合物(a-1)と、液状チタン化合物(a-2)とを、電子供与体(a-3)の存在下で反応させて固体状のマグネシウム・チタン複合体を析出させる方法。
(13)上記(12)で得られた反応生成物に、チタン化合物(a-2)をさらに反応させる方法。
(14)上記(11)または(12)で得られる反応生成物に、電子供与体(a-3)およびチタン化合物(a-2)をさらに反応させる方法。
(15)マグネシウム化合物(a-1)と、チタン化合物(a-2)と、電子供与体(a-3)とを粉砕して得られた固体状物を、ハロゲン、ハロゲン化合物または芳香族炭化水素のいずれかで処理する方法。なおこの方法においては、マグネシウム化合物(a-1)のみを、あるいはマグネシウム化合物(a-1)と電子供与体(a-3)とからなる錯化合物を、あるいはマグネシウム化合物(a-1)とチタン化合物(a-2)とを粉砕する工程を含んでもよい。また粉砕後に反応助剤で予備処理し、次いでハロゲンなどで処理してもよい。反応助剤としては、有機金属化合物あるいはハロゲン含有ケイ素化合物などが用いられる。
(16)マグネシウム化合物(a-1)を粉砕した後、チタン化合物(a-2)を接触させる方法。マグネシウム化合物(a-1)の粉砕時および/または接触時には、電子供与体(a-3)を必要に応じて反応助剤とともに用いる。
(17)上記(11)~(16)で得られる化合物をハロゲン、ハロゲン化合物または芳香族炭化水素で処理する方法。
(18)金属酸化物、有機マグネシウム(a-1)およびハロゲン含有化合物との接触反応物を、電子供与体(a-3)および好ましくはチタン化合物(a-2)と接触させる方法。
(19)有機酸のマグネシウム塩、アルコキシマグネシウム、アリーロキシマグネシウムなどのマグネシウム化合物(a-1)を、チタン化合物(a-2)、電子供与体(a-3)、必要に応じてハロゲン含有炭化水素と接触させる方法。
(20)マグネシウム化合物(a-1)とアルコキシチタンとを含む炭化水素溶液と、電子供与体(a-3)および必要に応じてチタン化合物(a-2)と接触させる方法。この際ハロゲン含有ケイ素化合物などのハロゲン含有化合物を共存させることが好ましい。
(21)還元能を有さない液状のマグネシウム化合物(a-1)と、有機金属化合物とを反応させて固体状のマグネシウム・金属(アルミニウム)複合体を析出させ、次いで電子供与体(a-3)およびチタン化合物(a-2)を反応させる方法。
(式(2)中、aは0、1または2であり、R3はシクロペンチル基、シクロペンテニル基、シクロペンタジエニル基またはこれらの誘導体からなる群から選ばれる基を示し、R4およびR5はそれぞれ独立に炭化水素基を示す。)
式(2)において、R3の具体的なものとしては、シクロペンチル基、2-メチルシクロペンチル基、3-メチルシクロペンチル基、2-エチルシクロペンチル基、3-プロピルシクロペンチル基、3-イソプロピルシクロペンチル基、3-ブチルシクロペンチル基、3-tert-ブチルシクロペンチル基、2,2-ジメチルシクロペンチル基、2,3-ジメチルシクロペンチル基、2,5-ジメチルシクロペンチル基、2,2,5-トリメチルシクロペンチル基、2,3,4,5-テトラメチルシクロペンチル基、2,2,5,5-テトラメチルシクロペンチル基、1-シクロペンチルプロピル基、1-メチル-1-シクロペンチルエチル基などのシクロペンチル基またはその誘導体;シクロペンテニル基、2-シクロペンテニル基、3-シクロペンテニル基、2-メチル-1-シクロペンテニル基、2-メチル-3-シクロペンテニル基、3-メチル-3-シクロペンテニル基、2-エチル-3-シクロペンテニル基、2,2-ジメチル-3-シクロペンテニル基、2,5-ジメチル-3-シクロペンテニル基、2,3,4,5-テトラメチル-3-シクロペンテニル基、2,2,5,5-テトラメチル-3-シクロペンテニル基などのシクロペンテニル基またはその誘導体;1,3-シクロペンタジエニル基、2,4-シクロペンタジエニル基、1,4-シクロペンタジエニル基、2-メチル-1,3-シクロペンタジエニル基、2-メチル-2,4-シクロペンタジエニル基、3-メチル-2,4-シクロペンタジエニル基、2-エチル-2,4-シクロペンタジエニル基、2,2-ジメチル-2,4-シクロペンタジエニル基、2,3-ジメチル-2,4-シクロペンタジエニル基、2,5-ジメチル-2,4-シクロペンタジエニル基、2,3,4,5-テトラメチル-2,4-シクロペンタジエニル基などのシクロペンタジエニル基またはその誘導体;さらにシクロペンチル基、シクロペンテニル基またはシクロペンタジエニル基の誘導体としてインデニル基、2-メチルインデニル基、2-エチルインデニル基、2-インデニル基、1-メチル-2-インデニル基、1,3-ジメチル-2-インデニル基、インダニル基、2-メチルインダニル基、2-インダニル基、1,3-ジメチル-2-インダニル基、4,5,6,7-テトラヒドロインデニル基、4,5,6,7-テトラヒドロ-2-インデニル基、4,5,6,7-テトラヒドロ-1-メチル-2-インデニル基、4,5,6,7-テトラヒドロ-1,3-ジメチル-2-インデニル基、フルオレニル基等があげられる。
本発明に係る微多孔膜形成用ポリプロピレン樹脂組成物は、さらに、可塑剤、ポリプロピレン以外のポリオレフィンおよび無機粉体からなる群より選ばれる少なくとも1種以上の材料を配合することが好ましい。
本発明の微多孔膜形成用ポリプロピレン樹脂組成物には、シャットダウン特性等の機能を付与する目的で、ポリエチレンを配合させてもよい。
本発明に係る微多孔膜形成用ポリプロピレン樹脂組成物は、孔の形状や量を調整する目的で、可塑剤を配合させてもよい。可塑剤の配合量は、前記超高分子量プロピレン単独重合体(A)100質量部に対して、0~200質量部であることが好ましく、10~150質量部であることがより好ましく、20~100質量部であることがさらに好ましい。
本発明に係る微多孔膜形成用ポリプロピレン樹脂組成物は、孔の形状や量、耐熱性を調整する目的で、無機粉体を配合させてもよい。
本発明の微多孔膜形成用ポリプロピレン樹脂組成物の調製方法としては、公知の各種の方法を用いることができる。例えば、ヘンシェルミキサー、リボンブレンダー、バンバリーミキサーなどの通常の混練装置を用いて、上述した各種成分を混練する方法が挙げられる。溶融混練およびペレタイズは、通常の単軸押出機あるいは2軸押出機、ブラベンダー又はロールを使用して、170~280℃、好ましくは190~250℃で溶融混練し、ペレタイズする。又はペレタイズなしに直接微多孔膜用のシート又はフィルムに従来公知の技術を用いて成形できる。
本発明に係る微多孔膜形成用ポリプロピレン樹脂組成物は、セパレータ、濾過膜、分離膜およびフィルターからなる群より選ばれる1種に用いられることが好ましい。前記微多孔膜形成用ポリプロピレン樹脂組成物を用いて形成されるセパレータ、濾過膜、分離膜またはフィルターは、耐熱性および強度に優れる。
上述した微多孔膜形成用ポリプロピレン樹脂組成物から、耐熱性や強度の優れた微多孔膜を好適に製造することができる。
プロピレン単独重合体の極限粘度[η]を、以下のとおりデカリン溶媒を用いて、135℃で測定した。
プロピレン単独重合体のメソペンタッド分率[mmmm]は、A.zambelliらのMacromolecules,8,687(1975)に示された帰属により定められた値であり、13C-NMRにより、下記条件で測定し、メソペンタッド分率=(21.7ppmでのピーク面積)/(19~23ppmでのピーク面積)とした。
分解能 400MHz
測定温度 125℃
溶媒 1,2,4-トリクロロベンゼン/重水素化ベンゼン=7/4
パルス幅 7.8μsec
パルス間隔 5sec
積算回数 2000回
シフト基準 TMS=0ppm
モード シングルパルスブロードバンドデカップリング
プロピレン単独重合体の融点(Tm)を、示差走査熱量計(DSC、パーキンエルマー社製)を用いて下記のとおり測定した。ここで、第3stepにおける吸熱ピークを融点(Tm)と定義した。
サンプルをアルミホイルで挟み、金型(厚さ:0.2mm)を用いて下記条件でプレス成形した。
プレス圧力:300kg/cm2
プレス時間:1分
プレス成形後、金型を氷水で室温付近まで冷却後、サンプルシートを得た。
得られたサンプルシートを下記測定容器に約0.4g封入し、下記測定条件でDSC測定を行った。
アルミ製PAN(DSC PANS 10μl BO―14-3015)
アルミ製COVER(DSC COVER BO14-3003)
第1step:30℃/分で240℃まで昇温し、10分間保持する。
第2step:10℃/分で30℃まで降温する。
第3step:10℃/分で240℃まで昇温する。
プロピレン単独重合体の重量平均分子量(Mw)を、ウォーターズ社製GPC-150C Plusを用い以下のようにして測定した。
プロピレン単独重合体0.8gを三菱化成社製燃焼装置でアルゴン/酸素気流下で、400~900℃で燃焼した。その後、燃焼ガスを超純水で捕集し濃縮後の試料液を、日本ダイオネック(株)DIONEX-DX300型イオンクロマト測定装置に導入し、陰イオンカラムAS4A-SC(ダイオネッ社製)により、プロピレン単独重合体の残存Cl量を測定した。
プロピレン単独重合体の灰分量を以下のとおり測定した。
微多孔膜のガーレー透気度を、JIS P8117により測定した。
微多孔膜の突刺し強度を、以下のとおり測定した。
微多孔膜のメルトダウン温度を、以下のとおり測定した。
プロピレン単独重合体について、昇温溶離分別(TREF)による溶出温度-溶出量曲線を以下のように測定し、最大ピークのピークトップ温度および該ピークの半値幅を求めた。
測定装置:昇温溶出分別装置 TREF200+型(Polymer ChAR社製)
TREFカラム:ステンレススチールマイクロボールカラム(3/8” o.d.×150mm)
溶離液:o-ジクロロベンゼン(300ppm BHT含有)(=ODCB)
試料濃度:0.2%(w/v)
注入量:0.3mL
ポンプ流量:0.5mL/分
検出器:赤外分光光度計 IR4(Polymer ChAR社製)
検出波数:3.42μm
試料溶解条件:150℃×90min溶解 → 95℃×45min静置
(プロピレン単独重合体(PP1)の合成)
(1)予備重合
内容積0.5リットルの攪拌機付きの三つ口フラスコを窒素ガスで置換した後、脱水処理したヘプタンを400ミリリットル、トリエチルアルミニウム18ミリモル、ジシクロペンチルジメトキシシラン3.7ミリモル、固体状チタン触媒成分(三井化学(株)社製TK200触媒)4gを加えた。内温を20℃で攪拌しながらプロピレンを導入した。1時間後、攪拌を停止し結果的に固体触媒1g当たり2.0gのプロピレンが重合した予備重合触媒成分を得た。
内容積6リットルの攪拌機付きステンレス製オートクレーブを充分乾燥し、窒素置換の後、脱水処理したヘプタン6リットル、トリエチルアルミニウム6ミリモル、ジシクロペンチルジメトキシシラン1.2ミリモルを加えた。系内の窒素をプロピレンで置換した後に、攪拌しながらプロピレンを導入した。内温80℃、プロピレン圧力0.8MPa-Gに系内が安定した後、上記予備重合触媒成分をTi原子換算で0.46ミリモル含んだヘプタンスラリー100ミリリットルを加え、プロピレンを連続的に供給しながら80℃で4時間重合を行った。
(プロピレン単独重合体(PP2)の合成)
(1)予備重合
内容積0.5リットルの攪拌機付きの三つ口フラスコを窒素ガスで置換した後、脱水処理したヘプタンを400ミリリットル、ジエチルアルミニウムクロライド18グラムを加え市販のSolvay型三塩化チタン触媒(東ソー・ファインケム社製)2gを加えた。内温を20℃に保持し、攪拌しながらプロピレンを導入した。80分後、攪拌を停止し結果的に固体触媒1g当たり0.8gのプロピレンが重合した予備重合触媒成分を得た。
内容積6リットルの攪拌機付きステンレス製オートクレーブを充分乾燥し、窒素置換の後、脱水処理したヘプタン6リットルを加え、系内の窒素をプロピレンで置換した。その後、攪拌しながらプロピレンを導入し系内が温度40℃、圧力0.8MPa-Gに安定した後、上記予備重合触媒成分を固体触媒換算で3.0グラム含んだヘプタンスラリー600ミリリットルを加え、プロピレンを連続的に供給しながら40℃で7時間重合を行った。
(プロピレン単独重合体(PP3)の合成)
(1)予備重合
[合成例2]と同様に予備重合触媒成分を調製した。
内容積6リットルの攪拌機付きステンレス製オートクレーブを充分乾燥し、窒素置換の後、脱水処理したヘプタン6リットルを加え、系内の窒素をプロピレンで置換した。その後、攪拌しながらプロピレンを導入し系内が温度70℃、圧力0.8MPa-Gに安定した後、上記予備重合触媒成分を固体触媒換算で1.0グラム含んだヘプタンスラリー200ミリリットルを加え、プロピレンを連続的に供給しながら70℃で5時間重合を行った。
(プロピレン単独重合体(PP4)の合成)
(1)予備重合
[合成例1]と同様に予備重合触媒成分を調製した。
内容積6リットルの攪拌機付きステンレス製オートクレーブを充分乾燥し、窒素置換の後、脱水処理したヘプタン6リットル、トリエチルアルミニウム6ミリモル、ジシクロペンチルジメトキシシラン1.2ミリモルを加えた。系内の窒素をプロピレンで置換した後に、水素を0.02MPa-G張り込み、続いて攪拌しながらプロピレンを導入した。内温80℃、圧力0.8MPa-Gに系内が安定した後、上記予備重合触媒成分をTi原子換算で0.084ミリモル含んだヘプタンスラリー18ミリリットルを加え、プロピレンを連続的に供給しながら80℃で4時間重合を行った。
(プロピレン単独重合体(PP5)の合成)
(1)予備重合
内容積0.5リットルの攪拌機付きの三つ口フラスコを窒素ガスで置換した後、脱水処理したヘプタンを400ミリリットル、ジエチルアルミニウムクロライド18グラムを加え市販のSolvay型三塩化チタン触媒(東ソー・ファインケム社製)2gを加えた。内温を20℃に保持し、攪拌しながらプロピレンを導入した。80分後、攪拌を停止し結果的に固体触媒1g当たり0.8gのプロピレンが重合した予備重合触媒成分を得た。
内容積6リットルの攪拌機付きステンレス製オートクレーブを充分乾燥し、窒素置換の後、脱水処理したヘプタン6リットルを加え、系内の窒素をプロピレンで置換した。その後、攪拌しながらプロピレンを導入し系内が温度50℃、圧力0.8MPa-Gに安定した後、上記予備重合触媒成分を固体触媒換算で1.5グラム含んだヘプタンスラリー300ミリリットルを加え、プロピレンを連続的に供給しながら50℃で6時間重合を行った。
(1)予備重合
内容積0.5リットルの攪拌機付きの三つ口フラスコを窒素ガスで置換した後、脱水処理したヘプタンを400ミリリットル、トリエチルアルミニウム18ミリモル、ジシクロペンチルジメトキシシラン3.7ミリモル、固体状チタン触媒成分(三井化学(株)社製TK200触媒)4gを加えた。内温を20℃で攪拌しながらプロピレンを導入した。1時間後、攪拌を停止し結果的に固体触媒1g当たり2.0gのプロピレンが重合した予備重合触媒成分を得た。
内容積6リットルの攪拌機付きステンレス製オートクレーブを充分乾燥し、窒素置換の後、脱水処理したヘプタン6リットル、トリエチルアルミニウム6ミリモル、ジシクロペンチルジメトキシシラン1.2ミリモルを加えた。系内の窒素をプロピレンで置換した後に、攪拌しながらプロピレンを導入した。内温50℃、プロピレン圧力0.8MPa-Gに系内が安定した後、上記予備重合触媒成分をTi原子換算で0.69ミリモル含んだヘプタンスラリー150ミリリットルを加え、プロピレンを連続的に供給しながら50℃で8時間重合を行った。
下記表2に示した割合でポリプロピレン樹脂組成物及び酸化防止剤イルガノックス1010=1000ppm、固形パラフィン又は流動パラフィンを250℃回転数20rpmのラボプラストミル(東洋精機製作所社製)に投入し、60rpmにて3分混練した。次に、220℃100kg/cm2で加熱プレス後、30℃で冷却、厚さ500μmのプレスシートを得た。該プレスシートを、150℃で4×5倍に延伸し、延伸フィルムを得た。該延伸フィルムを室温でn-ヘプタンに2時間浸漬後、室温で4時間真空乾燥し、固形パラフィン又は流動パラフィンを除去して微多孔膜を得た。得られた微多孔膜について各種物性を測定した結果を下記表2に示す。
Claims (6)
- 下記要件(1)~(4)を満たす超高分子量プロピレン単独重合体(A)を必須成分とする微多孔膜形成用ポリプロピレン樹脂組成物;
(1)デカリン溶液を用いて測定した極限粘度[η]が7dl/g以上25dl/g未満であること
(2)13C-NMR(核磁気共鳴法)で測定したメソペンタッド分率が90.0~99.5%の範囲にあること
(3)示差走査熱量計(DSC)によって測定された融点が153~167℃であること
(4)o-ジクロロベンゼンを用いた昇温溶離分別(TREF)による溶出温度-溶出量曲線において、最大ピークのピークトップ温度が116~125℃に存在し、かつ該ピークの半値幅が7.0℃以下であること。 - さらに、可塑剤、ポリプロピレン以外のポリオレフィンおよび無機粉体からなる群より選ばれる少なくとも1種以上の材料を配合することよりなる、請求項1に記載の微多孔膜形成用ポリプロピレン樹脂組成物。
- セパレータ、濾過膜、分離膜およびフィルターからなる群より選ばれる1種に用いられることを特徴とする請求項1または2に記載の微多孔膜形成用ポリプロピレン樹脂組成物。
- 前記セパレータが電池用セパレータまたはコンデンサー用セパレータであることを特徴とする請求項3に記載の微多孔膜形成用ポリプロピレン樹脂組成物。
- 前記電池用セパレータがリチウムイオン二次電池用セパレータであることを特徴とする請求項4に記載の微多孔膜形成用ポリプロピレン樹脂組成物。
- 前記分離膜が医療用分離膜であることを特徴とする請求項3に記載の微多孔膜形成用ポリプロピレン樹脂組成物。
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