WO2005023919A1 - 熱可塑性樹脂微多孔膜の製造方法 - Google Patents
熱可塑性樹脂微多孔膜の製造方法 Download PDFInfo
- Publication number
- WO2005023919A1 WO2005023919A1 PCT/JP2004/012571 JP2004012571W WO2005023919A1 WO 2005023919 A1 WO2005023919 A1 WO 2005023919A1 JP 2004012571 W JP2004012571 W JP 2004012571W WO 2005023919 A1 WO2005023919 A1 WO 2005023919A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- solvent
- cleaning
- cleaning solvent
- thermoplastic resin
- temperature
- Prior art date
Links
Classifications
-
- 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
-
- 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
-
- 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
- B01D67/0081—After-treatment of organic or inorganic membranes
- B01D67/0088—Physical treatment with compounds, e.g. swelling, coating or impregnation
-
- 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
- B01D71/261—Polyethylene
-
- 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
- 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
- C08J5/20—Manufacture of shaped structures of ion-exchange resins
- C08J5/22—Films, membranes or diaphragms
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/20—Specific permeability or cut-off range
-
- 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
Definitions
- the present invention relates to a method for producing a microporous thermoplastic resin membrane, and particularly to a method for producing a microporous thermoplastic resin membrane while suppressing volatilization and film shrinkage of a cleaning solvent used for removing a solvent for film formation. How to do.
- Thermoplastic resin microporous membranes are widely used in various applications such as battery separators, electrolytic capacitor diaphragms, various filters, moisture-permeable waterproof clothing, reverse osmosis filtration membranes, ultrafiltration membranes, and microfiltration membranes. Used.
- thermoplastic resin microporous film is produced by a wet method, a solvent or a plasticizer is used, but it is necessary to remove the gelled product after film formation so that it does not remain in the final product.
- a solvent or a plasticizer is used, but it is necessary to remove the gelled product after film formation so that it does not remain in the final product.
- the gel-like molded product is usually washed with a volatile washing solvent such as methylene chloride, and then dried with hot air.
- a volatile washing solvent such as methylene chloride
- the gel-like molded product has been dried by blowing hot air while holding it on a tenter or by contacting the gel-like molded product with a multi-stage heating roll.
- a tenter method particularly when removing a highly volatile cleaning solvent such as methylene chloride, there is a problem that the contraction force of the microporous membrane is so large that the microporous membrane cannot be gripped without being damaged. is there.
- this method requires a large amount of hot air.
- the multi-stage heating roll method has the problem that the microporous membrane shrinks in the width direction due to the force roll gap that normally uses a small diameter roll
- Patent Document 1 discloses a method for cleaning having a surface tension of 24 mN / m or less at a temperature of 25 ° C. A method using a solvent is proposed.
- Patent Document 2 proposes a method of removing a cleaning solvent while transferring a gel-like molded product by a suction roll in a process for producing a microporous membrane. With this method, evaporation of the washing solvent can be prevented. In particular, when the gel-like molded product is sucked in a poor solvent for the washing solvent, the effect of removing the washing solvent is high. This method has a problem in that marks (suction marks) due to suction grooves or holes in the roll can be formed on the microporous film.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2002-256099
- Patent Document 2 JP-A-2003-82151
- an object of the present invention is to rapidly produce a thermoplastic resin microporous film having excellent appearance while suppressing volatilization and film shrinkage of a cleaning solvent used for removing a film forming solvent. Is to provide a way.
- the present inventors have found that (a) removing a film-forming solvent using a low-surface-tension, low-water-soluble cleaning solvent, By removing the remaining washing solvent from the molded article of (1), it is possible to quickly produce a thermoplastic resin microporous membrane having excellent appearance while suppressing volatilization of the washing solvent and film shrinkage, and (b) After removing the film-forming solvent with the cleaning solvent, in a state where the cleaned molded article is brought into contact with the poor solvent for the cleaning solvent, the poor solvent is passed through the cleaned molded article by suction means.
- the appearance properties can be quickly changed while suppressing the volatilization of the cleaning solvent and film shrinkage. Can produce excellent thermoplastic resin microporous membrane And found.
- the present invention has been completed based on a powerful invention.
- the method further comprises the step of removing the cleaning solvent.
- A a temperature of 25 ° C.
- B the boiling point at atmospheric pressure is 100 ° C or less
- the solubility in water at a temperature of 16 ° C is 600 ppm (by mass) or less.
- the method is characterized in that a certain solvent is used, and the cleaning solvent that also retains the power of the molded product after the cleaning is removed using hot water.
- the minimum temperature of the hot water is preferably 5 ° C or higher, more preferably 5 ° C or higher, of the cleaning solvent (hereinafter referred to as “cleaning solvent A” unless otherwise specified). Particularly preferred is a boiling point of + 3 ° C. or higher.
- the upper limit temperature of the hot water is more preferably 5 ° C. or lower, which is preferably lower than the crystal dispersion temperature of the thermoplastic resin.
- the cleaning solvent A is removed from the molded article after washing (hereinafter referred to as “washed molded article” unless otherwise specified) by a method of showering the molded article with warm water or immersing the washed molded article in warm water. Or a method based on a combination thereof.
- a method of showering warm water on the washed molded product a method of showering the wound portion of the washed molded product while continuously transporting the washed molded product by a roll is preferable.
- a method of immersing the washed molded article in warm water the washed molded article is rocked in warm water, or at least a portion where the washed molded article is wound is continuously immersed while continuously transporting the washed molded article by a roll.
- the cleaning solvent A preferably satisfies the following conditions (1)-(11).
- Boiling point at atmospheric pressure is 80 ° C or less.
- the solubility in water at a temperature of 16 ° C is less than 300 ppm (by mass).
- the fluorinated fluorocarbon described in the above (4) is a chain-form fluorocarbon represented by a composition formula of C H F.
- the fluorinated fluoroether described in (4) above is a FOTOCH of CFOCH or CFFOH.
- the perfluorocarbon described in (4) above is a compound represented by C F or a composition formula of C F.
- the normal paraffin having 5 to 7 carbon atoms described in (4) is at least one selected from the group consisting of normal pentane, normal hexane, and normal heptane.
- the isoparaffin having 5 to 7 carbon atoms described in (4) above is 2-methylpentane, 3-methylpentane, 2,2-dimethylbutane, 2,3-dimethylbutane, 2-methylhexane, -Methylhexane, 3-ethylpentane, 2,2-dimethylpentane, 2,3-dimethylpentane, 2,4-dimethylpentane, 3,3-dimethylpentane and 2,2,3-trimethylbutane At least one kind selected from
- the cycloparaffin having 5 to 7 carbon atoms described in (4) above is at least one selected from the group consisting of cyclopentane, cyclohexane and methylcyclopentane.
- the removal of the film-forming solvent by the cleaning solvent can be performed in two or more steps.
- a cleaning solvent other than the above-mentioned cleaning solvent A hereinafter, referred to as “cleaning solvent B” unless otherwise specified
- the cleaning solvent A alone may be used, and the cleaning solvent A and the cleaning solvent B may be used.
- the number of washing steps is not limited to two, but may be three or more.
- the upper limit of the number of steps in the cleaning step may be about seven steps.
- the cleaning solvent B preferably satisfies the following conditions (12)-(25).
- Non-aqueous solvent having a boiling point of 100 ° C or higher and a flash point of 0 ° C or higher.
- the non-aqueous solvent described in (13) above is a normal paraffin having 8 or more carbon atoms, or a normal paraffin having 5 or more carbon atoms in which at least a part of a hydrogen atom is substituted with a halogen atom.
- Consists of C5-14 esters which may be substituted with halogen atoms, C4-14 ethers where some of the hydrogen atoms may be replaced with halogen atoms, and C5-10 ketones At least one species selected from the group.
- the normal paraffin having 8 or more carbon atoms described in the above (14) more preferably has 8 to 12 carbon atoms, and specifically has normal octane, normal nonane, normal decane, normal decane, and normal dodecane force.
- Naru group power It is at least one selected.
- Normal paraffin having 5 or more carbon atoms in which at least a part of the hydrogen atoms according to the above (14) is substituted with a halogen atom is 1-chloropentane, 1-cyclohexane, 1-chloroheptan. Tan, 1-chlorooctane, 1-bromopentane, 1-bromohexane, 1-bromoheptane, 1-bromooctane, 1,5-dichloropentane, 1,6-dichlorohexane and 1,7-dichlorohexane Putanka
- a group power is at least one selected.
- the isoparaffin having 8 or more carbon atoms according to the above (14) is 2,3,4-trimethylpentane
- the cycloparaffin having 7 or more carbon atoms described in (14) above is cycloheptane, cyclooctane, methylcyclohexane, cis- and trans-1,2-dimethylcyclohexane, cis- and trans-1, 3-dimethylcyclohexane, and cis- and trans-1,4-dimethylcyclohexane powers and at least one group power selected from n
- the cycloparaffin having 5 or more carbon atoms in which a part of hydrogen atoms has been substituted with a halogen atom according to the above (14) is at least one selected from the group consisting of chlorocyclopentane and chlorocyclohexane.
- the aromatic hydrocarbon having 7 or more carbon atoms described in (14) is at least one selected from the group consisting of toluene, ortho-xylene, meta-xylene and para-xylene.
- the aromatic hydrocarbon having 6 or more carbon atoms in which a part of the hydrogen atoms described in the above (14) are substituted with a halogen atom includes benzene, 2-chlorotoluene, 3-chlorotoluene, At least one member selected from the group consisting of -chlorotonolene, 3-chloro orthoxylene, 4-chloro orthoxylene, 2-chlorometa-xylene, 4-chloromethaxylene, 5-chlorometaxylene, and 2-chloropara-xylene It is.
- the alcohol having 5 to 10 carbon atoms in which a part of the hydrogen atoms described in the above (14) may be substituted with a halogen atom includes isopentyl alcohol, tertiary pentyl alcohol, cyclopentanol, and cyclopentanol.
- Xanol, 3-methoxy-1-butanol, 3-methoxy-3-methyl-1-butanol, propylene glycol normal butyl ether and 5-chloro-1-pentanolica are at least one selected from the group consisting of:
- the ester having 5 to 14 carbon atoms in which a part of the hydrogen atoms according to the above (14) may be substituted with a halogen atom is acetyl ether, dimethyl ether, n-butyl ester, n-propyl acetate, n-butyl acetate, or n-butyl acetate. At least one selected from isopentyl, 3-methoxybutyl acetate, 3-methoxy-3-methylbutyl acetate, ethyl ethyl butyrate, ethyl ethyl normal valerate, and 2-chloroethyl acetic acid.
- the ether having 414 carbon atoms in which a part of the hydrogen atoms according to the above (14) may be substituted with a halogen atom is a group power having normal butyl ether, diisobutyl ether and bischloroethyl ether powers. Is at least one kind.
- the ketone having 5 to 10 carbon atoms described in the above (14) is selected from the group consisting of 2-pentanone, 3-pentanone, 2-hexanone, 3-hexanone, cyclopentanone and cyclohexanone. At least one kind.
- a solution obtained by melt-kneading a thermoplastic resin and a film-forming solvent is extruded from a die, and a gel obtained by cooling is obtained.
- shape molding After removing the film-forming solvent remaining from the object with the cleaning solvent, the suctioned means contacts the molded article after cleaning with the molded article after cleaning in contact with the poor solvent for the cleaning solvent. Having a step of removing the cleaning solvent by passing a poor solvent
- the contact time t (second) between the molded article after the washing and the suction means is represented by the following general formula (1) :
- ⁇ is the temperature of the poor solvent (° C)
- P is the suction pressure (kPa)
- L is the size of the through hole of the suction I means (the diameter of the largest inscribed circle of the through hole) m)).
- the contact time between the molded article after the washing and the suction means is preferably 0.05 seconds or more, more preferably 0.2 seconds or more.
- the suction means at least one kind of wire roll more preferably selected from the group consisting of a wire roll, a slit roll and a punching roll, which is preferably a suction roll, is particularly preferable.
- the pore size is preferably from 10 to 5,000 ⁇ m, more preferably from 20 to 2,000 ⁇ m, and particularly preferably from 50 to 500 ⁇ m.
- the suction pressure is preferably from 0.5 to 60 kPa, more preferably from 1 to 40 kPa, particularly preferably from 3 to 20 kPa.
- the temperature of the poor solvent is preferably the boiling point of the cleaning solvent 10 ° C. ⁇ boiling point + 50 ° C.
- the boiling point of the cleaning solvent is preferably one boiling point + 50 ° C.
- the cleaning is more preferable. It is particularly preferred that the boiling point of the solvent for use + 3 ° C-the boiling point + 50 ° C.
- the poor solvent is water.
- thermoplastic resin satisfies the following conditions (26)-(35).
- Polyolefin, polyester, polyamide, polyarylene ether, and polyarylene sulfide force At least one selected from the group consisting of:
- the polyolefin described in the above (26) is polyethylene or a polyethylene composition.
- the weight average molecular weight of the polyethylene described in the above (27) is 1 ⁇ 10 4 —5 ⁇ 10 6 .
- the weight average molecular weight of the polyethylene described in the above (28) is 1 ⁇ 10 5 —4 ⁇ 10 6 .
- the polyethylene according to any one of the above (27) to (29) is at least one selected from ultrahigh molecular weight polyethylene, high density polyethylene, medium density polyethylene, and low density polyethylene.
- the polyethylene according to any one of the above (27) to (30) is an ultrahigh molecular weight polyethylene having a mass average molecular weight of 5 ⁇ 10 5 or more.
- the ratio MwZMn (molecular weight distribution) between the weight average molecular weight (Mw) and the number average molecular weight (Mn) of the polyethylene according to any one of (27) to (31) is 5-300.
- the polyethylene composition according to the above (27) essentially requires ultrahigh molecular weight polyethylene, and further contains at least one selected from the group consisting of high density polyethylene, medium density polyethylene and low density polyethylene.
- the polyethylene composition according to the above (33) contains an ultrahigh molecular weight polyethylene having a weight average molecular weight of 5 ⁇ 10 5 or more and a high density polyethylene having a weight average molecular weight of 1 ⁇ 10 4 or more and less than 5 ⁇ 10 5 .
- the ethylene ' ⁇ -olefin copolymer in the group contains at least one selected polyolefin.
- thermoplastic resin microporous film can be quickly formed. Can be manufactured.
- the thermoplastic resin microporous membranes obtained by the first and second production methods of the present invention have excellent porosity, air permeability, and heat shrink resistance, and have water marks (water bubble-like marks) and Excellent appearance with no suction mark.
- a microporous membrane having such characteristics is suitable for a battery separator, a filter, and the like.
- FIG. 1 is a photograph showing the appearance of the microporous membrane of Example 1.
- FIG. 2 is a photograph showing the appearance of a microporous membrane of Comparative Example 2.
- thermoplastic resin examples include polyolefm, polyester, polyamide, polyarylene ether and polyarylene sulfide, among which polyolefin is preferable.
- the polyolefin can be either a single entity or a composition that also comprises two or more polyolefins.
- polystyrene examples include homopolymers and copolymers of ethylene, propylene, butene-1, pentene-1, hexene-1, 4-methylpentene-1, otaten, butyl acetate, methyl methacrylate, and styrene. Either can be used.
- polyethylene is preferable as polyolefin.
- the weight average molecular weight of the polyethylene usually 1 X 10 4 - a 1 X 10 7, preferably 1 X 10 4 - 5 is X 10 6, more preferably 1 X 10 5 one 4 X 10 6 .
- polyethylene examples include ultrahigh molecular weight polyethylene, high density polyethylene, medium density polyethylene, and low density polyethylene. These polyethylenes may be copolymers containing small amounts of other ⁇ -olefins. As other ⁇ -olefins other than ethylene, propylene, butene-1, pentene-1, hexene-1, 4-methylpentene-1, otaten, butyl acetate, methyl methacrylate, styrene and the like can be used. Among them, ultra-high molecular weight polyethylene is preferred as polyethylene.
- Polyethylene is a composition composed of a single polyethylene or two or more polyethylenes, and even in the case of deviation, the ratio MwZMn (molecular weight distribution) of the mass average molecular weight (Mw) to the number average molecular weight (Mn) is obtained. It is preferably, but not limited to, in the range of 5 to 300, more preferably in the range of 10 to 100.
- polyethylene may be prepared by multi-stage polymerization. However, the polyethylene is not limited to multi-stage polymerized polyethylene, but may be a single-stage polyethylene.
- the polyolefin composition a composition in which polyethylene is essential is more preferable, and the composition in which the ultrahigh molecular weight polyethylene is essential is more preferable.
- Ultra high molecular weight polyethylene The polyolefin composition that requires ren preferably contains at least one member selected from the group consisting of high-density polyethylene, medium-density polyethylene and low-density polyethylene, and more preferably high-density polyethylene.
- the mass average molecular weight of these high-density polyethylene, medium-density polyethylene and low-density polyethylene is preferably 1 ⁇ 10 4 or more and less than 15 ⁇ 10 5 .
- Both the first and second production methods of the present invention include: (1) a step of adding a solvent for film formation to the thermoplastic resin, followed by melt-kneading to prepare a thermoplastic resin solution, (2) Extruding the thermoplastic resin solution from the die lip and cooling to form a gel-like molded product; (3) removing the film-forming solvent using a cleaning solvent; and (4) removing the cleaning solvent from the obtained film. Including the step. If necessary, a stretching step may be provided before and / or after the step (3). (1) After the step (4), a step of drying the film, a cross-linking treatment step by ionizing radiation, a heat treatment step, a hydrophilization treatment step, a surface coating treatment step and the like may be provided.
- the first and second manufacturing methods will be described in order.
- thermoplastic resin solution a suitable film-forming solvent is added to the thermoplastic resin, and then melt-kneaded to prepare a thermoplastic resin solution.
- additives such as an antioxidant, an ultraviolet absorber, an antiblocking agent, a pigment, a dye, and an inorganic filler may be added to the thermoplastic resin solution as needed, as long as the effects of the present invention are not impaired. it can.
- finely divided silica can be added as a pore-forming agent.
- solvent for film formation ! / ⁇ deviation of a liquid solvent and a solid solvent can also be used.
- liquid solvent examples include aliphatic or cyclic hydrocarbons such as nonane, decane, decalin, paraxylene, pendecane, dodecane, and liquid paraffin, and mineral oil fractions having a boiling point corresponding to these.
- a non-volatile liquid solvent such as liquid paraffin.
- the solid solvent preferably has a melting point of 80 ° C. or lower. Examples of such a solid solvent include paraffin wax, ceryl alcohol, stearyl alcohol, dicyclohexyl phthalate and the like.
- a liquid solvent and a solid solvent may be used in combination.
- the viscosity of the liquid solvent at a temperature of 25 ° C is preferably in the range of 30-500 cSt, more preferably in the range of 50-200 cSt. If the viscosity is less than 30 cSt, the ejection of the thermoplastic resin solution from the die lip is not uniform, and kneading is difficult. On the other hand, if it exceeds 500 cSt, it is difficult to remove the liquid solvent.
- the melt-kneading method is not particularly limited, but a method of uniformly kneading in an extruder is preferred.
- the melting temperature is preferably in the range of the melting point of the thermoplastic resin + 10 ° C-+ 100 ° C. Specifically, the melting temperature is preferably in the range of 140-230 ° C, more preferably in the range of 170-200 ° C.
- the melting point refers to a value determined by differential scanning calorimetry (DSC) based on JIS K7121.
- the solvent for film formation may be added before the start of kneading, or may be added during the kneading from the middle of the extruder. In melt kneading, it is preferable to add an anti-oxidizing agent in order to prevent the thermoplastic resin from oxidizing.
- the mixing ratio of the thermoplastic resin and the film-forming solvent is 100% by mass of the total of both, and the thermoplastic resin is 1 to 50% by mass, preferably 20% by mass. — 40% by weight. If the ratio of the thermoplastic resin is less than 1% by mass, when the thermoplastic resin solution is extruded, the swell and neck-in at the die exit become large, and the moldability and self-supporting property of the gel-like molded product are reduced. . On the other hand, when the proportion of the thermoplastic resin exceeds 50% by mass, the moldability of the gel-like molded article is reduced.
- melt-kneaded thermoplastic resin solution is extruded directly from an extruder through a die or through another extruder, or once cooled, pelletized, and then extruded again through an extruder from a die.
- a sheet die lip having a rectangular base shape is usually used, but a double cylindrical hollow die lip, an inflation die lip, or the like can also be used.
- the die lip gap is typically in the range of 0.1-5 mm and is heated to a temperature of 140-250 ° C during extrusion.
- the extrusion rate of the heated solution is preferably in the range of 0.2-15 m / min.
- the solution extruded with a die lip force is cooled to form a gel-like molded product. Cooling is preferably performed at a rate of 50 ° CZ or more to at least the temperature of the geli-dani. By performing such cooling, the phase separation structure in which the thermoplastic resin phase is microphase separated by the film forming solvent can be fixed. Cooling is preferably performed to 25 ° C or less. In general, when the cooling rate is reduced, the pseudo cell units become large, and the higher-order structure of the obtained gel-like molded product becomes coarse. However, when the cooling rate is increased, the cell units become dense.
- cooling rate is less than 50 ° C / min, the crystallinity increases, and it is difficult to obtain a gel-like molded product suitable for stretching.
- a cooling method a method of contacting with a cooling medium such as cold air or cooling water, a method of contacting with a cooling roll, and the like can be used.
- the solvent for film formation is removed from the gel-like molded product.
- the surface tension at a temperature of 25 ° C is 24 mN / m or less
- the boiling point at atmospheric pressure is 100 ° C or less
- (c) 16 ° C Use a cleaning solvent that has a solubility in water of 600 ppm or less (by mass) at a temperature of and is not compatible with the thermoplastic resin (hereinafter referred to as “cleaning solvent A” unless otherwise specified) .
- surface tension of the cleaning solvent By setting the surface tension of the cleaning solvent to 24 mN / m or less at a temperature of 25 ° C, the interfacial tension between the cleaning solvent and the microporous wall is reduced, and the cleaning solvent for cleaning with warm water at the subsequent stage is used. The shrinkage and densification of the network structure that occurs when the solvent is removed can be suppressed. Therefore, the porosity and permeability of the microporous membrane are improved.
- surface tension refers to a tension generated at an interface between a gas and a liquid, and is measured based on JIS K 3362.
- the surface tension of the cleaning solvent A at a temperature of 25 ° C. is preferably 20 mN / m or less. Surface of cleaning solvent A Although the tension decreases as the operating temperature rises, the solvent for cleaning usually falls below the boiling point.
- the boiling point of the cleaning solvent at atmospheric pressure is preferably 80 ° C or lower.
- solubility of the cleaning solvent in water By setting the solubility of the cleaning solvent in water at a temperature of 16 ° C to 600 ppm (by mass) or less, water marks (water bubbles) are formed on the microporous membrane when the cleaning solvent is removed with warm water. Can be prevented from being formed.
- the solubility is preferably not more than 300 ppm (by mass).
- the solubility of cleaning solvent A in water increases as the operating temperature increases. However, as long as the solubility at 16 ° C is 600 ppm or less (by mass), no water mark is formed on the microporous membrane when the cleaning solvent is removed with warm water.
- the cleaning solvent A include, for example, fluorine compounds such as fluorocarbons at the mouth, fluorethers at the mouth, perfluorocarbons, perfluorocarbons, and the like; normal paraffins having 5 to 7 carbon atoms; Examples thereof include isoparaffins having 5 to 7 carbon atoms and cycloparaffins having 5 to 7 carbon atoms.
- Fluorocarbons with chain hydrids represented by the composition formula for example, Fluorocarbons with hydridic formulas represented by the composition formulas of CFOCH and CFOCH
- One ter for example, C F and perfluorocarbons represented by the composition formula of C F, and
- C F OCF perfluoroether represented by the composition formula of C F OCF.
- At least one of the groups is also preferred. Since these fluorine compounds do not have ozone depleting properties, the burden on the environment can be reduced even if they evaporate outside the production system. In addition, since these fluorine compounds have a flash point of 40 ° C or higher (some compounds do not have a flash point), the risk of a flash explosion is low.
- normal paraffins having 5 to 7 carbon atoms include normal pentane, normal hexane, and normal heptane, with normal pentane being preferred. 5-7 carbon atoms Soparaffins include 2-methylpentane, 3-methylpentane, 2,2-dimethylbutane, 2,3-dimethylbutane, 2-methylhexane, 3-methylhexane, 3-ethylpentane, 2,2-dimethylpentane , 2,3-dimethylpentane, 2,4-dimethylpentane, 3,3-dimethylpentane, 2,2,3-trimethylbutane and the like.
- cycloparaffins having 5-7 carbon atoms examples include cyclopentane, cyclohexane, and methylcyclopentane.
- a cyclopentane having a surface tension of 24 mN / m or less at a temperature of 20 ° C. is preferable.
- Table 1 shows the surface tension, boiling point, and solubility in water of representative compounds among the compounds listed as examples of the cleaning solvent A.
- the cleaning solvent A may be appropriately selected according to the film forming solvent!
- the cleaning solvent A may be a single composition or a mixture of a plurality of cleaning solvents A.
- the cleaning solvent A may include other solvents that do not satisfy any of the above requirements (a) to (c) as long as the requirements of the above (a) to (c) are satisfied.
- a mixture for example, at least one selected from the group consisting of the fluorine compound, the normal paraffin having 5 to 7 carbon atoms, the isoparaffin having 5 to 7 carbon atoms, and the cycloparaffin having 5 to 17 carbon atoms. , Eg CHF pairs
- Fluorocarbons with a boiling point of 100 ° C or below One in which a small amount of one ter, an aliphatic ketone, an aliphatic alcohol, an aliphatic ester or the like is added can be used. Cleaning may be performed in two or more steps using different cleaning solvents A.
- the film forming solvent may be removed with a cleaning solvent other than the cleaning solvent A (hereinafter, referred to as “cleaning solvent B” unless otherwise specified). .
- cleaning solvent B a cleaning solvent other than the cleaning solvent A
- the cleaning effect is further improved by two or more cleaning steps using the cleaning solvent B and the cleaning solvent A appropriately selected according to the film forming solvent.
- the cleaning solvent A in the final stage of the cleaning process, the cleaning solvent B used in the previous stage can be removed, and the shrinkage and densification of the network structure that occurs when the cleaning solvent is removed in the subsequent stage with warm water can be prevented. it can.
- treating the molded body from which the film-forming solvent has been removed with the cleaning solvent B with the cleaning solvent A is referred to as “rinsing treatment”.
- the solvent B for washing may be any solvent which does not have compatibility with the thermoplastic resin.
- chlorinated hydrocarbons fluorinated hydrocarbons, paraffin compounds, aromatics, alcohols, esters, ethers And non-aqueous solvents such as ketones.
- non-aqueous solvents for example, chlorinated hydrocarbons such as methylene chloride, carbon tetrachloride and the like, which are common as solvents for removing the solvent for film formation; fluorinated hydrocarbons such as trifluoride and the like; n -Pentane: ethers such as getyl ether and dioxane; methylethyl ketone and the like are preferred.
- non-aqueous solvent has a surface tension of 24 mN / m or less at any temperature of 80 ° C or less.
- non-aqueous solvents include, for example, normal pentane, hexane, heptane, trifluoride ethane, getyl ether, 2-methylpentane, 3-methylpentane, cyclohexane, cyclopentane, acetone, methylethylketone, etc. Is mentioned.
- non-aqueous solvent has a boiling point at atmospheric pressure of 100 ° C or higher and a flash point of 0 ° C or higher.
- Such non-aqueous solvents are refractory and safe to use because they have low environmental impact and low risk of fire and explosion.
- because of its high boiling point it is easy to condense and recover immediately, and it is easy to recycle.
- “Ignition The “point” refers to a value measured based on JIS K 2265.
- the flash point is preferably 5 ° C or higher, more preferably 40 ° C or higher.
- non-aqueous solvent having a boiling point of 100 ° C or higher and a flash point of 0 ° C or higher include normal paraffin having 8 or more carbon atoms and carbon atoms in which at least a part of hydrogen atoms are substituted by halogen atoms.
- normal paraffins having 8 or more carbon atoms normal octane, normal nonane, normal decane, normal pendecane and normal dodecane are more preferable, and normal octane, normal nonane and normal decane are more preferable! /.
- Examples of normal paraffins having 5 or more carbon atoms in which at least a part of the hydrogen atoms have been replaced by halogen atoms include 1-chloropentane, 1-chlorohexane, 1-chloroheptane, and 1-chloroheptane. Tan, 1-bromopentane, 1-bromohexane, 1-bromoheptane, 1-bromooctane, 1,5-dichloropentane, 1,6-dichlorohexane and 1,7-dichloroheptane are preferred 1- Black-mouthed pentane, 1-black-hexane, 1-bromopentane and 1-bromohexane are more preferred.
- Isoparaffins having 8 or more carbon atoms include 2,3,4-trimethylpentane, 2,2,3-trimethylpentane, 2,2,5-trimethylhexane, 2,3,5-trimethylhexane, 2,3,5-trimethylheptane and 2,5,6-trimethyloctane are preferred 2,3,4-trimethylpentane, 2,2,3-trimethylpentane, 2,2,5-trimethylhexane and 2,3,5-trimethylhexane is more preferred! /.
- Cycloparaffins having 7 or more carbon atoms include cycloheptane, cyclooctane, methylcyclohexane, cis- and trans-1,2-dimethylcyclohexane, cis- and trans-1,3-dimethylcyclohexane.
- Xane, and cis- and trans-1,4-dimethylcyclohexane More preferred is methylcyclohexane.
- cycloparaffin having 5 or more carbon atoms in which at least a part of a hydrogen atom is substituted by a halogen atom chlorocyclopentane and chlorocyclohexane are preferable, and chlorocyclopentane is more preferable.
- aromatic hydrocarbon having 7 or more carbon atoms As the aromatic hydrocarbon having 7 or more carbon atoms, toluene, ortho-xylene, meta-xylene, and para-xylene are preferable, and toluene is more preferable.
- Examples of the aromatic hydrocarbon having 6 or more carbon atoms in which at least a part of the hydrogen atom has been replaced by a halogen atom include benzene, 2-chlorotonolene, 3-chlorotonolene, 4-chlorotonolene, and 3-chloronorth.
- X-ylene, 4-chloro ortho-xylene, 2-chloro-meta-xylene, 4-chloro-meta-xylene, 5-chloro-meta-xylene and 2-chloro-para-xylene are preferred. Black mouth toluene and 4-black mouth toluene are more preferred! / ,.
- Examples of the alcohol having 5 to 10 carbon atoms in which a part of the hydrogen atom may be replaced by a halogen atom include isopentyl alcohol, tertiary pentyl alcohol, cyclopentanol, cyclohexanol, and 3-methoxy-1.
- 3-butanol, 3-methoxy-3-methyl-1-butanol, propylene glycol normal butyl ether and 5-chloro-1-pentanol are preferred 3-methoxy-1-butanol, 3-methoxy-3-methyl 1-butanol, propylene glycol normal butyl ether and 5-chloro-1-pentanol are more preferred.
- Esters having 5 to 14 carbon atoms in which a part of hydrogen atoms may be substituted with halogen atoms include getyl carbonate, getyl maleate, normal propyl acetate, normal butyl acetate, isopentyl acetate, and acetic acid 3-ethyl ester.
- Methoxybutyl, 3-methoxy-3-methylbutyl acetate, normal ethyl butyrate, normal ethyl valerate, isopentyl acetate, 3-methoxybutyl acetate, and 2-methoxy-3-methylbutyl acetate are preferred.
- Ethyl ethyl butyrate and 2-chloroethyl ethyl acetate are more preferred!
- C14-C14 ether in which a part of the hydrogen atom may be substituted by a halogen atom, dipropylene glycol dimethyl ether, normal butyl ether, diisobutyl ether and bischloroethyl ether are preferred. Propylene glycol dimethyl ether and bischloroethyl ether are more preferred.
- Ketones having 5 to 10 carbon atoms include 2-pentanone, 3-pentanone, 2-hexanone, and 3-hexanone.
- 2-Pentanone and 3-pentanone are more preferred, with non-, cyclopentanone and cyclohexanone being more preferred.
- the cleaning solvent B may be appropriately selected according to the film forming solvent.
- the cleaning solvent B may be a single composition or a mixture of a plurality of cleaning solvents B.
- an optional component C for example, a chain-type nodal opening fluorocarbon represented by a composition formula of C H F
- a cyclic-noid-opening fluorocarbon represented by a composition formula of C H F, for example, C F and
- Perfluorocarbons represented by the formula of CF and, for example, CF OCF and CF
- One kind of solvent may be added.
- the cleaning solvent B contains the optional component C as described above, the burden on the environment and the danger of a fire explosion can be reduced.
- the content of the optional component C is preferably 2 to 98 parts by mass, more preferably 5 to 50 parts by mass based on 100 parts by mass of the whole mixed solvent.
- the solvent B for cleaning and the optional component C are mixed at a rate of 24 mN / m or less at any temperature where the surface tension is 80 ° C or less, the solvent B for cleaning relatively volatilizes from the film during cleaning. In this case, film shrinkage can be suppressed.
- cleaning solvent BZ cleaning solvent A methylene chloride ZC F OCH, methylene chloride
- washing solvent B / washing solvent A methylene chloride / CFOCH, methylene chloride ZCFOCH, methylene chloride ZCF, methylene chloride ZCF
- the purpose is not limited to this.
- Cleaning with cleaning solvent A alone or a combination of cleaning solvent A and cleaning solvent B is indispensable. If necessary, three or more steps may be performed. Although the number of washing steps in such a process is not particularly limited, it is usually three steps and 17 steps, and preferably 314 steps.
- the gel-like molded article can be washed by a method of showering the gel-like molded article with a washing solvent, a method of dipping the gel-like molded article in a washing solvent, a method of a combination thereof, or the like. These washing treatments are preferably performed while the gel-like molded product is transported continuously or intermittently. Usually, a roll is used as a means for conveying the gel-like molded product. When the gel-like molded article is immersed in the cleaning solvent while being continuously transported, the gel-like molded article is passed through the bath of the cleaning solvent.
- the amount of the washing solvent A and the washing solvent B is preferably 300 to 30,000 parts by mass with respect to 100 parts by mass of the gel-like molded product.
- the amount of the cleaning solvent A and the amount of the cleaning solvent B are set to 50 parts by mass.
- it is 200 parts by mass. Washing is preferably performed until the film forming solvent remaining in the gel-like molded product is less than 1% by mass based on the amount added! /.
- the operating temperature of the cleaning solvent A depends on its surface tension. Specifically, it is preferable to use the cleaning solvent A at a temperature or higher at which the surface tension of the cleaning solvent A is 24 mN / m or lower. Cleaning solvent A can be generally used at room temperature because its surface tension is less than 24 mN / m at a temperature of at most 25 ° C. The cleaning solvent A may be heated if necessary.
- the use temperature of the cleaning solvent B depends on its boiling point, but is generally in the range of 20 to 80 ° C.
- the boiling point of the cleaning solvent B is 150 ° C or lower, cleaning at room temperature is possible, and the cleaning solvent B may be heated if necessary.
- the cleaning solvent B is preferably heated because the permeability of the cleaning solvent B into the inside of the film is poor at room temperature.
- washed molded product From the molded product after washing (hereinafter referred to as “washed molded product” unless otherwise specified), Remove remaining cleaning solvent A.
- the use of hot water as a removal medium for the cleaning solvent A causes the cleaning solvent A to flow out of the cleaning molded product and Z or volatilization to occur quickly. Therefore, the cleaning solvent A can be removed much faster than in the case where hot air is used, and the production efficiency is improved. Since the cleaning solvent A extracted from the cleaning molded product mainly diffuses into the warm water, the volatilization of the cleaning solvent A can be suppressed by replacing the contaminated warm water with unused warm water at an appropriate frequency.
- the lower limit temperature of the hot water is preferably at least 5 ° C, more preferably at least 3 ° C, more preferably the boiling point of washing solvent A to be removed. .
- the upper limit temperature of the warm water is preferably not higher than the crystal dispersion temperature of the thermoplastic resin, more preferably not higher than 5 ° C. If the upper limit temperature of the hot water is higher than the crystal dispersion temperature, the resin may be softened. As described above, for example, the crystal dispersion temperature of polyethylene is generally 90 ° C.
- the crystal dispersion temperature of the thermoplastic resin is 95 ° C or more, it is preferable to keep the temperature of the hot water at 95 ° C or less to keep the amount of water vapor generated from the hot water at 85 ° C or less. Is more preferred.
- the contact time between the washed molded article and hot water is preferably 15 seconds or less. Since the boiling point of the cleaning solvent A is 100 ° C or less, a contact time of 15 seconds or less is usually sufficient.
- the removal of the cleaning solvent A from the cleaning molded product can be performed by a method of showering the cleaning molded product with warm water, a method of immersing the washed molded product in warm water, a method of a combination thereof, or the like. These removal treatments are preferably carried out while transporting the washed molded article continuously or intermittently.
- Amount of hot water in the case of a shower of hot water cleaning molding is more preferably 50- 5000 ml / m 2 at and even preferred instrument 100- 2000 ml / m 2.
- the hot water in the shower is less than 50 ml / m 2 , the hot water cannot be uniformly showered with respect to the washed molded article, while if it exceeds 5000 ml / m 2 , the circulation control of the hot water becomes difficult.
- a nozzle can be used as means for injecting hot water.
- the roll is used for washing. It is preferable to shower on the wrapped portion of the molded product or to immerse at least the wrapped portion of the washed molded product in warm water. With such treatment methods, the roll is heated by warm water and the washed molded article can be heated quickly, so that the removal rate of the washing solvent A is further increased. If necessary, the roll may be heated from the inside.
- the heating temperature of the roll is preferably not higher than the crystal dispersion temperature of the thermoplastic resin, more preferably not higher than 5 ° C.
- the diameter of the roll is preferably 3-100 cm, more preferably 5-30 cm.
- the transport speed when removing the cleaning solvent A while continuously transporting the cleaning molded product is from 0.5 to 80 m / min, preferably from 1 to 50 m / min, in terms of production efficiency. Is more preferred. Usually, one roll is sufficient, but multiple rolls may be used if necessary.
- the solvent removal site of the washed molded article is rocked in warm water.
- the solvent removal portion of the washed molded article is fixed by a frame plate or the like, and oscillates at a frequency of, for example, about 100 rpm.
- the content of the cleaning solvent remaining in the thermoplastic resin microporous membrane be set to 5% by mass or less using hot water, with the film mass after drying being 100% by mass. It is more preferable that the content be not more than mass%. If the removal is insufficient and a large amount of the cleaning solvent remains in the film, it is not preferable because the porosity is reduced by the subsequent heat treatment and the permeability is deteriorated.
- the film from which the cleaning solvent has been removed is dried by an air drying method, a heating drying method, or the like. Since water has low affinity with the microporous membrane, it can be easily and quickly removed by blowing hot air on the membrane after the hot water treatment.
- the drying temperature is preferably lower than or equal to the crystal dispersion temperature of polyolefin, and particularly preferably lower than the crystal dispersion temperature by 5 ° C or more.
- the film is stretched before and / or after the film-forming solvent removing step (3) as required.
- the stretching is more preferably performed before the film-forming solvent removing step.
- Stretching is performed by heating a gel-like molded product and then applying a usual tenter method, roll method, inflation method, rolling method, The combination can be performed at a predetermined magnification.
- the stretching may be uniaxial stretching or biaxial stretching. Force biaxial stretching is preferred. In the case of biaxial stretching, either simultaneous biaxial stretching or sequential stretching may be used, but simultaneous biaxial stretching is preferred. Stretching improves the mechanical strength.
- the stretching ratio varies depending on the thickness of the gel-like molded product, it is preferably at least 2 times in uniaxial stretching, more preferably 3 to 30 times.
- biaxial stretching at least 3 times or more in any direction, that is, 9 times or more in area magnification is preferable because piercing strength is improved. If the area magnification is less than 9 times, stretching is insufficient, and a high elasticity and high strength thermoplastic resin microporous membrane cannot be obtained. On the other hand, if the area magnification exceeds 400 times, there will be restrictions on the stretching apparatus, stretching operation, and the like.
- the stretching temperature is preferably set to be equal to or lower than the melting point of the thermoplastic resin + 10 ° C, and more preferably within the range of less than the crystal melting point. If the stretching temperature exceeds the melting point + 10 ° C, the resin melts and the molecular chains cannot be oriented by stretching. If the stretching temperature is lower than the crystal dispersion temperature, the softening of the resin is insufficient, so that the film is broken by stretching and stretching at high magnification cannot be performed immediately.
- the stretching temperature is usually in the range of 100 to 140 ° C, preferably in the range of 110 to 120 ° C.
- the crystal dispersion temperature refers to a value obtained by measuring temperature characteristics of dynamic viscoelasticity based on ASTM D 4065.
- the dried microporous membrane is preferably subjected to a crosslinking treatment by ionizing radiation.
- ⁇ -rays, j8-rays, ⁇ -rays, electron beams, etc. can be used as ionizing radiation.
- Crosslinking by ionizing radiation can be performed with an electron dose of 0.1-100 Mrad and an accelerating voltage of 100-300 kV.
- the meltdown temperature can be improved by the crosslinking treatment.
- the heat treatment stabilizes the crystals of the microporous film and makes the lamella layer uniform.
- a heat treatment method any of a heat stretching treatment, a heat fixing treatment, and a heat shrink treatment may be used, and these may be appropriately selected according to the physical properties required for the microporous membrane. These heat treatments are performed at a temperature not higher than the melting point of the microporous polyolefin membrane, preferably at a temperature not lower than 60 ° C and not higher than 10 ° C.
- the thermal stretching treatment is performed by a commonly used tenter method, roll method or rolling method.
- the stretching is performed in at least one direction with a stretching ratio of 1.01 to 2.0 times, and more preferably, the stretching ratio is 1.01 to 1.5 times.
- the heat setting is performed by a tenter method, a roll method, or a rolling method.
- the heat shrinking treatment may be performed by a tenter method, a roll method or a rolling method, or may be performed by using a belt conveyor or floating.
- the heat shrinkage treatment is preferably performed in at least one direction in a range of 50% or less, more preferably in a range of 30% or less.
- the film from which the cleaning solvent has been removed may be subjected to a hydrophilic treatment.
- a hydrophilic treatment a monomer graft treatment, a surfactant treatment, a corona discharge treatment or the like is used.
- the monomer grafting treatment is preferably performed after ionizing radiation.
- any of a nonionic surfactant, a cationic surfactant, an anionic surfactant, and a zwitterionic surfactant can be used, and a non-ionic surfactant is used. Is preferred.
- the surfactant is converted into an aqueous solution or a solution of a lower alcohol such as methanol, ethanol, or isopropyl alcohol, and the microporous membrane is hydrophilized by a method using a doctor blade for dipping.
- the obtained microporous hydrophilized membrane is dried.
- a method of performing a heat treatment while preventing shrinkage for example, a method of subjecting the hydrophilized microporous membrane to the above-mentioned heat stretching treatment may be mentioned.
- the microporous membrane obtained by removing the cleaning solvent is coated with a fluorine resin porous material such as polyvinylidene fluoride or polytetrafluoroethylene, or a porous material such as polyimide or polyphenylene sulfide.
- a fluorine resin porous material such as polyvinylidene fluoride or polytetrafluoroethylene
- a porous material such as polyimide or polyphenylene sulfide.
- the meltdown characteristics when used as a battery separator are improved.
- the microporous membrane obtained by removing the cleaning solvent High temperature properties when used as a battery separator by forming a polypropylene thin film with a fraction of 0.12 to 0.88 of dyads (structural units in which two consecutive monomer units have an enantiomeric relationship to each other) Is improved.
- the second manufacturing method differs from the first manufacturing method in that (0) there is no restriction on the cleaning solvent used in the film forming solvent removing step, and The only difference is that the cleaning solvent is removed by passing the poor solvent through the cleaning molded article by the suction means while the cleaning molded article is in contact with the poor solvent, and the other steps are the same. Only the film forming solvent removing step and the cleaning solvent removing step will be described.
- the cleaning solvent that can be used in the second production method is not particularly limited as long as it is incompatible with the thermoplastic resin.
- the above-mentioned cleaning solvents A and B can be used.
- the cleaning method using cleaning solvents A and B is the same as above.
- the contact time t (second) between the cleaning molded article and the suction means is represented by the following general formula (1): t ⁇ (100- ⁇ ) V (1, 100 X ⁇ ° 5 X logL) '' (1)
- ⁇ indicates the temperature (° C) of the poor solvent
- P indicates the suction pressure (kPa)
- L indicates the size of the through-hole of the suction means (the diameter m of the largest inscribed circle of the through-hole).
- Range When the contact time t exceeds the above range, the film is deformed by the suction force of the suction means, or a suction mark is formed on the film surface, thereby deteriorating the appearance of the film. In some cases, physical properties such as air permeability and porosity may be degraded. From the viewpoint of sufficiently removing the cleaning solvent, the contact time t is preferably at least 0.05 seconds, more preferably at least 0.2 seconds, within the range satisfying the general formula (1).
- a force suction roll such as a suction roll or a suction belt is preferable.
- a suction roll By using a suction roll, the gel is removed while suctioning the cleaning solvent on the outer peripheral surface. It can transfer shaped articles. Further, since tension can be applied to the washed molded article, film shrinkage can be suppressed. If the washed molded article is dried with a heated roll without suction, the tension on the washed molded article tends to be non-uniform due to the vaporizing action of the washing solvent. When a suction roll is used, the cleaning solvent vaporized by heating can be quickly removed, so that the tension on the cleaning molded product can be maintained even when the transport speed is increased.
- suction roll There are no particular restrictions on the suction roll.
- a cylindrical shaft main body having a vacuum loadable inside and a large number of through-holes communicating with the hollow inside, and a GO shaft main body.
- a pair of side plates provided at both ends and having at least one through-hole communicating with the cavity,
- (m) One having a pair of bearings having a through hole communicating with the through hole of the side plate.
- the cavity is depressurized by being sucked by a vacuum pump connected through the through-hole pipe of the bearing, and the suction roll can suck liquid and gas on its outer peripheral surface while rotating by a motor.
- the suction roll for example, Japanese Patent No. 2630870, Japanese Patent No. 2899226, JP-A-63-247251, JP-A-63-267648, JP-A-4-260561, JP-A-8-133536 and JP-A-8-133536 No. 208100, JP-A-9-67053, JP-A-2002-160857, JP-A-2002-255423 and the like can be used.
- a suction roll a wire roll in which a through-hole is formed by a gap between wires, a slit roll in which a through-hole is formed in a slit shape, and a through-hole are formed by punching holes.
- Pantingroca Luka The wire roll in which at least one selected is preferred is more preferable.
- the through-hole size refers to the diameter of the largest inscribed circle of the through-hole provided in the suction means.
- the through-hole size is defined as the gap between the wires, the width of the slit in the short direction, and the diameter of the largest circle inscribed in the punching hole. Point to each.
- the pore size is preferably 10 to 5,000 ⁇ m. If the pore size is smaller than 10 ⁇ m, there is a risk that pinholes may be formed in the microporous membrane due to the metal powder in the cleaning solvent removal tank that has been sucked, not only because the suction speed of the cleaning solvent is low. On the other hand, if the pore size is larger than 5,000 m, suction marks are likely to occur on the microporous membrane.
- the pore size is preferably between 20 and 2,000 m, more preferably between 50 and 500 ⁇ m.
- the opening ratio of the suction roll is not particularly limited, but is preferably 1 to 50%.
- the distance between the through holes in the roll axis direction is not particularly limited, but is preferably 0.5 to 10 mm.
- the diameter of the suction roll is preferably 5-500 cm, more preferably 10-200 cm. If the diameter is less than 5 cm, the contact area between the cleaning molded product and the roll is small, and the suction of the cleaning solvent is insufficient. On the other hand, if the diameter exceeds 500 cm, the equipment becomes too large.
- the suction pressure (the difference between the atmospheric pressure and the cavity pressure of the suction means) is preferably 0.5 to 60 kPa, more preferably 1 to 40 kPa, and more preferably 3 to 20 kPa. Is particularly preferred. If the suction pressure is smaller than 0.5 kPa, the removability of the cleaning solvent will be poor, or it will be difficult to apply tension to the washed molded product, while if it is larger than 60 kPa, suction marks will be generated. It becomes easier.
- poor solvent amount is more preferably 50- 10,000 ml / m 2 at and even preferred instrument 100- 5,000 ml / m 2. If the amount of the poor solvent in the shower is less than 50 ml / m 2 , the poor solvent cannot be uniformly showered on the surface to be removed, whereas if it exceeds 10,000 ml / m 2 , it is difficult to control the circulation of the poor solvent.
- the poor solvent may be sprayed on the washed molded article in a poor solvent bath. As a result, the extraction speed of the cleaning solvent is further increased, and the extracted cleaning solvent is not only sucked but also diffused into the poor solvent, thereby improving the removal efficiency.
- the poor solvent is not particularly limited as long as it is poorly compatible with the washing solvent.
- water is suitable as a poor solvent.
- pentane is used as a washing solvent
- water, ⁇ , ⁇ -dimethylformamide (pure solvent) is used as a poor solvent.
- DMF dimethylformamide
- the poor solvent be heated, whereby the evaporation of the cleaning solvent can be promoted, and the removal of the cleaning solvent is expedited.
- the upper limit temperature of the poor solvent is preferably not more than the crystal dispersion temperature of the thermoplastic resin and not more than -5 ° C.
- the temperature of the poor solvent should be 10 ° C-boiling point + 50 ° C of the cleaning solvent to be removed within the range below the crystal dispersion temperature of the thermoplastic resin.
- the boiling point of the washing solvent which is particularly preferable to be one boiling point + 50 ° C, is more preferably the boiling point + 3 ° C-the boiling point + 50 ° C.
- the solvent removal rate becomes slow.
- the temperature of the poor solvent is higher than the boiling point of the cleaning solvent + 50 ° C, the cleaning solvent will vaporize violently, which may deteriorate the appearance of the film.
- the temperature is preferably from 30 to 95 ° C, more preferably from 35 to 90 ° C, even more preferably from 40 to 85 ° C. . If the water temperature is lower than 30 ° C, the solvent removal rate will be slow. If it is higher than 95 ° C, the generation of water vapor will increase significantly and work efficiency will deteriorate.
- the suction roll is heated by the poor solvent.
- the suction roll may be heated by a hot air heater or the like.
- the heating temperature of the suction roll is not more than the crystal dispersion temperature of the thermoplastic resin, and preferably not more than -5 ° C.
- the heating temperature of the suction roll should be 10 ° C-boiling point + 50 ° C of the cleaning solvent to be removed within the range below the crystal dispersion temperature of the thermoplastic resin.
- the boiling point of the cleaning solvent is more preferable.
- the boiling point of the washing solvent which is particularly preferable to be one boiling point + 50 ° C, is more preferably the boiling point + 3 ° C-the boiling point + 50 ° C.
- the physical properties of the microporous membrane produced by the above method are usually such that the porosity is 25-80% and the thermal shrinkage is 15% or less in both the machine direction (MD) and the vertical direction (TD). is there.
- the membrane produced by the first method has an air permeability of 10-2,000 seconds / 100 cc in terms of a thickness of 30 m, and has no water mark on the surface.
- the membrane produced by the second method has an air permeability of 10-2,000 seconds / 100 cc in terms of film thickness, and there is no deformation on the surface where suction marks remain.
- the thickness of the thermoplastic resin microporous membrane can be appropriately selected depending on the application. For example, when used as a battery separator, the thickness is preferably 5 to 200 m. Since the thermoplastic resin microporous membrane obtained by the production method of the present invention exhibits excellent permeability, it is suitable as a separator for batteries, a filter, and the like.
- Ultra high molecular weight polyethylene UHMWPE
- HDPE high density polyethylene
- Mw / Mn 16
- Polyethylene melting point 135 ° C, crystal dispersion temperature 90 ° C
- tetrakis [ ⁇ thylene-3- (3,5-ditert-butyl-4-hydroxyphenyl) -propionate] as an antioxidant
- a polyethylene composition was obtained by adding 0.375 parts by mass of methane per 100 parts by mass of the composition.
- the mixture was fed and melt-kneaded at 200 ° C. and 200 rpm to prepare a polyethylene solution in an extruder.
- this polyethylene solution is extruded from a T-die installed at the tip of the extruder so that the thickness becomes about 40 ⁇ m when biaxially stretched, and the polyethylene solution is taken out with a cooling roll adjusted to 50 ° C.
- a gel-like sheet was formed.
- the obtained gel-like sheet was biaxially stretched using a continuous stretching machine at 116 ° C. so as to be 5 ⁇ 5 times to obtain a stretched film.
- the obtained membrane was fixed to a frame plate [size: 20 cm x 20 cm, made of aluminum (the same applies hereinafter)], and normal pentane heated to 23 ° C [surface tension: 15.5 mN / m (25 ° C), Boiling point: 36 ° C, solubility in water: 225 ppm (by mass) (16 ° C)], and washed while rocking at 100 rpm for 30 seconds. The above series of washing operations was repeated three more times while replacing normal pentane with a new solution each time.
- the temperature of the translucent membrane after washing was adjusted to 50 ° C while it was fixed to the frame plate. It was immersed in a hot water bath, and was subjected to hot water treatment while rocking until normal pentane was extracted and the film turned white. The time required to remove the cleaning solvent was 5 seconds. Water adhering to the obtained membrane was blown off by air spray, and further heat-set at 122 ° C. for 60 seconds to produce a microporous polyethylene membrane.
- a biaxially stretched membrane produced in the same manner as in Example 1 was fixed to a frame plate, and the temperature was adjusted to 23 ° C.
- Methylene chloride surface tension: 27.3 mN / m (25 ° C.), boiling point: 40.0 ° C. Solubility in water: 20,000 ppm (by mass) (20 ° C)]
- the above series of washing operations was repeated twice more while replacing methylene chloride with a fresh solution each time.
- methyl perfluorobutyl ether adjusted to 23 ° C [composition formula: CFOCH, product name: Novec HFE-7100, manufactured by Sumitomo 3LEM Ltd.]
- a biaxially stretched film having a length of 600 m and a width of 0.4 m was produced.
- the obtained stretched film was washed by passing through a continuous washing device at a speed of 2 mZ.
- Three continuous washing tanks containing methylene chloride controlled at 23 ° C One having two second washing tanks (rinse tanks) containing methyl perfluorobutyl ether whose temperature was adjusted to 23 ° C. was used.
- the residence time in each of the three first cleaning tanks was 30 seconds, and the residence time in each of the two second cleaning tanks was 20 seconds.
- the membrane was passed through a hot water bath adjusted to 70 ° C to remove the washing solvent.
- a 10 cm diameter roll is placed in a hot water tank so that the level of the hot water liquid is 2 cm below the axis. It was made to come in contact with warm water while in contact with.
- the hot water was maintained at 70 ° C and continuously supplied and withdrawn so as not to be excessively contaminated by the washing solvent.
- the residence time of the membrane in the hot water tank was set to 4 seconds. After removing the washing solvent, the water adhering to the membrane was blown off by air spray, and further heat-set at 122 ° C for 60 seconds to produce a microporous polyethylene membrane.
- Example 2 In the same manner as in Example 1, a biaxially stretched film having a length of 600 m and a width of 0.4 m was produced. The obtained stretched film was washed by passing through a continuous washing device at a speed of 2 mZ.
- a continuous washing apparatus three first washing tanks containing methylene chloride adjusted to 23 ° C and a perfluorinated hexane adjusted to 23 ° C [composition formula: CF, product name: Fluorinert HC-72]
- the gel-like molded product in the washing tank was treated with normal decane adjusted to 60 ° C (the number of washings: 4 times in total), and the same procedure as in Example 1 was carried out except that the temperature of the hot water was 80 ° C. And Polje A microporous membrane of styrene was prepared. The time required to remove the cleaning solvent was 600-900 seconds.
- Example 2 Same as Example 1 except that the gel-like molded product was treated in a washing tank with methylene chloride adjusted to 23 ° C (number of washings: 4 times in total), and the temperature of hot water was set to 70 ° C. Thus, a microporous polyethylene film was produced. The time required for removing the cleaning solvent was 3 seconds.
- the treatment of the gel-like molded product in the washing tank was performed by adjusting the temperature of getyl ether to 23 ° C [surface tension: 16.4 mN / m (25 ° C), boiling point: 35 ° C, solubility in water: 65,000 ppm (mass basis) (20 ° C)] (the number of washings: 4 times in total), and a microporous polyethylene membrane was prepared in the same manner as in Example 1 except that the temperature of the hot water was changed to 70 ° C. . It took 2 seconds to remove the cleaning solvent.
- a microporous polyethylene membrane was produced in the same manner as in Example 2 except that the washing solvent was removed by blowing hot air at 70 ° C. The time required for removing the cleaning solvent was 40 seconds.
- a microporous polyethylene membrane was produced in the same manner as in Example 4 except that methylene chloride was used as the washing solvent for the rinsing tank. The time required for removing the cleaning solvent was 8 seconds.
- FIG. 1 Photographs of the surfaces of the microporous membranes of Example 1 and Comparative Example 2 are shown in FIG. 1 (Example 1) and FIG. 2 (Comparative Example 2). As shown in FIGS. 1 and 2, the surface of the microporous membrane of Example 1 is uniform without water marks, but water marks are generated on the surface of the microporous film of Comparative Example 1!
- thermoplastic resin microporous membrane obtained in Example 115 and Comparative Example 115 were measured by the following methods. Table 2 shows the results.
- Example No. Example 1 Example 2
- Example 3 Example 4
- HDPE (wt%) 75 75 75 75 75 PE concentration of melt-kneaded material (wt%) 25 25 25 25 Film forming conditions
- HDPE (wt%) 75 75 PE concentration of melt-kneaded material (wt%) 25 25 Film forming conditions
- thermoplastic resin microporous membranes of Examples 15 to 15 produced by the first method of the present invention were excellent in appearance properties, porosity, air permeability, and heat shrink resistance. ing.
- Comparative Example 1 rinsing was performed with a cleaning solvent having a boiling point of more than 100 ° C, so that it took a long time to remove the cleaning solvent, and the porosity and air permeability were poor.
- cleaning treatment was performed with a cleaning solvent having a surface tension at 25 ° C of more than 24 mN / m and a solubility in water at 16 ° C of more than 600 ppm (by mass).
- Comparative Example 3 was inferior in appearance, porosity and air permeability because it was washed with a washing solvent having a solubility in water at 16 ° C of more than 600 ppm (by mass). In Comparative Example 4, since the cleaning solvent was removed with warm air, it took a long time to remove the cleaning solvent.
- Ultra high molecular weight polyethylene UHMWPE
- HDPE high density polyethylene
- Polyethylene melting point 135 ° C, crystal dispersion temperature 90 ° C
- tetrakis [ ⁇ thylene-3- (3,5-ditert-butyl-4-hydroxyphenyl) -propionate] as an antioxidant
- a polyethylene composition was obtained by adding 0.375 parts by mass of methane per 100 parts by mass of the composition.
- the obtained gel-like molded product was subjected to biaxial stretching using a continuous stretching machine at 119 ° C. so as to be 5 ⁇ 5 times.
- the obtained biaxially stretched film was wound around a paper tube while cutting the end so that the width became 40 cm, to obtain a stretched film having a length of 600 m.
- the obtained stretched film was washed by passing it through a continuous washing device at a transport speed of 16 mZ.
- the cleaning solvent was removed with a suction wire roll while contacting the obtained cleaning molded article with hot water at 85 ° C.
- a suction wire roll with a round wire (diameter: 0.8 mm) wound [pore size (gap between wires): 50 / ⁇ ⁇ , diameter: 10 cm] It was installed so as to be 4 cm above the lowermost point, and the washed molded article was brought into contact with the lower circumferential part of the roll.
- the contact time between the washed molded product and the suction wire roll was 0.59 seconds, and the suction pressure was 5 kPa.
- the hot water was continuously supplied and withdrawn so as not to be excessively contaminated by the cleaning solvent.
- the membrane from which the washing solvent had been removed was fixed in a 20 cm ⁇ 20 cm aluminum-made frame, and heat-fixed at 124 ° C. for 120 seconds to produce a microporous polyethylene membrane.
- the transport speed of the stretched film was 8 mZ
- the supply speed of the new solution to be supplied to each first washing tank and each second washing tank was 2 L / min
- the suction pressure was 20 kPa
- the temperature of hot water was 75 ° C.
- a microporous polyethylene membrane was produced in the same manner as in Example 6, except that the contact time between the molded article and the suction wire roll was 1.18 seconds.
- a microporous polyethylene membrane was produced in the same manner as in Example 6, except that the cleaning solvent for the rinsing treatment was methylene chloride and the gap between the wires of the suction wire roll was 100 m.
- N-Pentane (Surface tension: 15.5 mN / m (25 ° C), Boiling point: 36 ° C, Solubility in water: 225 ppm (by mass) (16 ° C)]
- the transport speed of the stretched film is 12 mZ minutes
- the supply speed of the new liquid to be supplied to each first washing tank and each second washing tank is 3 L / min
- the gap between the wires of the suction wire roll is 200 m
- the suction pressure was 10 kPa
- the hot water temperature was 80 ° C
- the contact time between the washed molded product and the suction wire roll was 0.79 seconds.
- a microporous polyethylene membrane was produced in the same manner as in Example 9, except that the poor solvent was ⁇ , ⁇ -dimethylformamide whose temperature was adjusted to 80 ° C. instead of hot water.
- a microporous polyethylene membrane was produced in the same manner as in Example 6, except that the pressure was 200 m, the suction pressure was 20 kPa, and the temperature of the hot water was 70 ° C.
- the transport speed of the stretched film was set to 8 mZ, the supply speed of the new solution to be supplied to each first washing tank and each second washing tank was set to 2 L / min, and the contact time between the washed molded product and the suction wire roll was 1.18 seconds.
- a microporous polyethylene membrane was produced in the same manner as in Example 6, except that the above procedure was repeated.
- a microporous polyethylene membrane was produced in the same manner as in Example 6, except that the suction pressure was changed to 20 kPa.
- the transport speed of the stretched film is 8 mZ
- the supply speed of the new liquid to be supplied to each first cleaning tank and each second cleaning tank is 2 L / min
- the contact time between the cleaning molded product and the suction wire roll is 1.18.
- a microporous polyethylene membrane was produced in the same manner as in Example 8, except that the time was changed to seconds.
- thermoplastic resin microporous films obtained in Examples 6-11 and Comparative Examples 6-8 were measured by the following methods. Table 3 shows the results.
- HDPE wt%) 80 80 80 80 80 80 PE concentration of melt-kneaded material (wt%) 30 30 30 30 30 Film forming conditions
- thermoplastic resin microporous membranes of Examples 6-11 produced by the method of the present invention are particularly excellent in appearance properties, and have a high porosity, air permeability, and heat shrink resistance. Are better.
- Comparative Examples 6-8 since the contact time between the washed molded product and the suction roll exceeds the range represented by the general formula (1), striped suction marks are generated on the membrane surface. The appearance is bad.
- Comparative Example 6 is inferior in porosity and air permeability as compared with Example 7 in which the conditions for removing the solvent for film formation are the same, and Comparative Example 7 also has the same conditions for removing the solvent for film formation. The porosity and the air permeability were inferior to those of 6.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Health & Medical Sciences (AREA)
- Materials Engineering (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Cell Separators (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04772527A EP1661943B1 (en) | 2003-09-05 | 2004-08-31 | Method for producing micro-porous film of thermoplastic resin |
DE602004021946T DE602004021946D1 (de) | 2003-09-05 | 2004-08-31 | Verfahren zur herstellung einer mikroporösen folie aus thermoplastischem harz |
US10/570,265 US20070012617A1 (en) | 2003-09-05 | 2004-08-31 | Method for producing micro-porous film of thermoplastic resin |
KR1020067004516A KR101132287B1 (ko) | 2003-09-05 | 2004-08-31 | 열가소성 수지 미다공막의 제조 방법 |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003314040A JP2005082653A (ja) | 2003-09-05 | 2003-09-05 | 熱可塑性樹脂成形体の製造方法及びその熱可塑性樹脂成形体からなる微多孔膜 |
JP2003-314040 | 2003-09-05 | ||
JP2003-314039 | 2003-09-05 | ||
JP2003314039A JP5083927B2 (ja) | 2003-09-05 | 2003-09-05 | ポリオレフィン微多孔膜の製造方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005023919A1 true WO2005023919A1 (ja) | 2005-03-17 |
Family
ID=34277710
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/012571 WO2005023919A1 (ja) | 2003-09-05 | 2004-08-31 | 熱可塑性樹脂微多孔膜の製造方法 |
Country Status (6)
Country | Link |
---|---|
US (1) | US20070012617A1 (ja) |
EP (1) | EP1661943B1 (ja) |
KR (1) | KR101132287B1 (ja) |
DE (1) | DE602004021946D1 (ja) |
TW (1) | TW200517423A (ja) |
WO (1) | WO2005023919A1 (ja) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100209745A1 (en) * | 2007-08-31 | 2010-08-19 | Tonen Chemical Corporation | Microporous polyolefin membrane, its production method, battery separator and battery |
WO2013105526A1 (ja) * | 2012-01-10 | 2013-07-18 | Nogata Tetsuro | ポリオレフィン微多孔膜の製造方法 |
WO2014083831A1 (ja) * | 2012-11-29 | 2014-06-05 | 日東電工株式会社 | 多孔質膜の製造方法 |
US8932748B2 (en) | 2005-10-24 | 2015-01-13 | Toray Battery Separator Film Co., Ltd | Multi-layer, microporous polyolefin membrane, its production method, and battery separator |
EP1938942A4 (en) * | 2005-10-21 | 2016-02-17 | Toray Battery Separator Film | PROCESS FOR PRODUCING MICROPOROUS MEMBRANES OF THERMOPLASTIC RESIN |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4573874B2 (ja) * | 2005-07-29 | 2010-11-04 | 三井・デュポンフロロケミカル株式会社 | ハイドロフルオロカーボンを用いた放射性物質の除染用溶剤組成物及び除染材、並びに放射性物質の除染方法 |
US8426070B2 (en) * | 2007-12-14 | 2013-04-23 | Toray Battery Separator Film Co., Ltd. | Method for removing diluent from an extrudate of a polymer solution |
US20100248002A1 (en) * | 2007-12-31 | 2010-09-30 | Kotaro Takita | Microporous Multilayer Membrane, System And Process For Producing Such Membrane, And The Use Of Such Membrane |
WO2009084719A1 (en) * | 2007-12-31 | 2009-07-09 | Tonen Chemical Corporation | Microporous membrane, process for producing such a membrane and the use of such a membrane |
US8388878B2 (en) * | 2008-03-31 | 2013-03-05 | Ppg Industries Ohio, Inc. | Method for producing microporous sheet |
EP2108445A1 (en) | 2008-04-01 | 2009-10-14 | Tonen Chemical Corporation | System and process for producing a microporus membrane |
EP2111910A1 (en) | 2008-04-24 | 2009-10-28 | Tonen Chemical Corporation | System And Process For Producing A Multilayer Microporous Membrane |
WO2010027065A2 (en) * | 2008-09-02 | 2010-03-11 | Tonen Chemical Corporation | Microporous polymeric membranes, methods for making such membranes, and the use of such membranes as battery separator film |
WO2010101214A1 (ja) * | 2009-03-06 | 2010-09-10 | 国立大学法人 群馬大学 | 超高分子量ポリエチレン製フィルムの製造方法 |
US8460591B2 (en) * | 2010-03-23 | 2013-06-11 | GM Global Technology Operations LLC | Porous membranes and methods of making the same |
US8906845B2 (en) | 2010-07-21 | 2014-12-09 | Eastern Virginia Medical School | Peptide compounds to regulate the complement system |
US10005818B2 (en) | 2010-07-21 | 2018-06-26 | Realta Holdings, Llc | Derivative peptide compounds and methods of use |
US10947279B2 (en) | 2015-06-26 | 2021-03-16 | Realta Holdings, Llc | Synthetic peptide compounds and methods of use |
US10933116B2 (en) | 2015-06-26 | 2021-03-02 | Realta Holdings, Llc | Synthetic peptide compounds and methods of use |
DE102015212423A1 (de) * | 2015-07-02 | 2017-01-05 | Mahle International Gmbh | Vorrichtung und Verfahren zum Reinigen und/oder Konditionieren einer Kapillarmembran |
US20190247805A1 (en) * | 2016-11-04 | 2019-08-15 | Asahi Kasei Medical Co., Ltd. | Porous membrane and method for manufacturing porous membrane |
WO2019139886A1 (en) | 2018-01-09 | 2019-07-18 | Realta Holdings, Llc | Pic1 inhibition of myeloperoxidase oxidative activity in an animal model |
US10421847B1 (en) * | 2018-09-24 | 2019-09-24 | Northrop Grumman Systems Corporation | Nanoporous wick and open-cellular porous structures and method of manufacture |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08127667A (ja) * | 1994-10-27 | 1996-05-21 | Mitsubishi Gas Chem Co Inc | 多孔質ポリカーボネート樹脂粒状体およびその製造法 |
JP2001081229A (ja) * | 1999-09-16 | 2001-03-27 | Toyo Cloth Co Ltd | 生分解性多孔質膜及びその製造方法 |
JP2002256099A (ja) * | 2001-03-02 | 2002-09-11 | Tonen Chem Corp | 熱可塑性樹脂微多孔膜の製造方法 |
JP2003082151A (ja) * | 2001-09-06 | 2003-03-19 | Tonen Chem Corp | 熱可塑性樹脂成形体の製造方法及びその熱可塑性樹脂成形体からなる微多孔膜 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS565255B2 (ja) * | 1973-03-02 | 1981-02-04 | ||
JP4494638B2 (ja) * | 1998-10-01 | 2010-06-30 | 東燃化学株式会社 | ポリオレフィン微多孔膜及びその製造方法 |
TW539705B (en) * | 2000-06-30 | 2003-07-01 | Tonen Sekiyukagaku Kk | Process for preparing heat curable resin micro-porous film |
-
2004
- 2004-08-31 EP EP04772527A patent/EP1661943B1/en not_active Expired - Fee Related
- 2004-08-31 DE DE602004021946T patent/DE602004021946D1/de active Active
- 2004-08-31 WO PCT/JP2004/012571 patent/WO2005023919A1/ja active Application Filing
- 2004-08-31 KR KR1020067004516A patent/KR101132287B1/ko active IP Right Grant
- 2004-08-31 US US10/570,265 patent/US20070012617A1/en not_active Abandoned
- 2004-09-03 TW TW093126607A patent/TW200517423A/zh unknown
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08127667A (ja) * | 1994-10-27 | 1996-05-21 | Mitsubishi Gas Chem Co Inc | 多孔質ポリカーボネート樹脂粒状体およびその製造法 |
JP2001081229A (ja) * | 1999-09-16 | 2001-03-27 | Toyo Cloth Co Ltd | 生分解性多孔質膜及びその製造方法 |
JP2002256099A (ja) * | 2001-03-02 | 2002-09-11 | Tonen Chem Corp | 熱可塑性樹脂微多孔膜の製造方法 |
JP2003082151A (ja) * | 2001-09-06 | 2003-03-19 | Tonen Chem Corp | 熱可塑性樹脂成形体の製造方法及びその熱可塑性樹脂成形体からなる微多孔膜 |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1938942A4 (en) * | 2005-10-21 | 2016-02-17 | Toray Battery Separator Film | PROCESS FOR PRODUCING MICROPOROUS MEMBRANES OF THERMOPLASTIC RESIN |
US8932748B2 (en) | 2005-10-24 | 2015-01-13 | Toray Battery Separator Film Co., Ltd | Multi-layer, microporous polyolefin membrane, its production method, and battery separator |
US20100209745A1 (en) * | 2007-08-31 | 2010-08-19 | Tonen Chemical Corporation | Microporous polyolefin membrane, its production method, battery separator and battery |
US8414663B2 (en) * | 2007-08-31 | 2013-04-09 | Toray Battery Separator Film Co., Ltd. | Microporous polyolefin membrane comprising a polyethlene resin having a specific viscoelastic angular frequency, its production method, battery separator and battery comprising the same |
WO2013105526A1 (ja) * | 2012-01-10 | 2013-07-18 | Nogata Tetsuro | ポリオレフィン微多孔膜の製造方法 |
JP2013142101A (ja) * | 2012-01-10 | 2013-07-22 | Tetsuro Nogata | ポリオレフィン微多孔膜の製造方法 |
WO2014083831A1 (ja) * | 2012-11-29 | 2014-06-05 | 日東電工株式会社 | 多孔質膜の製造方法 |
Also Published As
Publication number | Publication date |
---|---|
EP1661943A1 (en) | 2006-05-31 |
TW200517423A (en) | 2005-06-01 |
KR20060099508A (ko) | 2006-09-19 |
EP1661943A4 (en) | 2006-12-27 |
DE602004021946D1 (de) | 2009-08-20 |
EP1661943B1 (en) | 2009-07-08 |
US20070012617A1 (en) | 2007-01-18 |
KR101132287B1 (ko) | 2012-04-05 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2005023919A1 (ja) | 熱可塑性樹脂微多孔膜の製造方法 | |
JP4734520B2 (ja) | 熱可塑性樹脂微多孔膜の製造方法 | |
KR100524110B1 (ko) | 열가소성수지 미세다공막의 제조방법 | |
JP4794098B2 (ja) | ポリオレフィン微多孔膜の製造方法 | |
TWI403549B (zh) | 聚烯烴微多孔膜之製法及其微多孔膜 | |
JP5342775B2 (ja) | ポリオレフィン微多孔膜の製造方法及びその微多孔膜 | |
JPWO2016194962A1 (ja) | 微多孔膜製造方法、微多孔膜、電池用セパレータ及び二次電池 | |
JP4634192B2 (ja) | 多孔質膜の製造方法 | |
JP4794099B2 (ja) | ポリオレフィン微多孔膜の製造方法 | |
JP4746771B2 (ja) | ポリオレフィン微多孔膜の製造方法 | |
JP4344550B2 (ja) | ポリオレフィン微多孔膜の製造方法及びポリオレフィン微多孔膜 | |
JP4817565B2 (ja) | ポリオレフィン微多孔膜の製造方法 | |
JP4746797B2 (ja) | ポリオレフィン微多孔膜の製造方法 | |
TW201838225A (zh) | 聚烯烴微多孔膜及使用其之電池 | |
JP4794100B2 (ja) | ポリオレフィン微多孔膜の製造方法 | |
JP5083927B2 (ja) | ポリオレフィン微多孔膜の製造方法 | |
JP4746830B2 (ja) | 熱可塑性樹脂微多孔膜の製造方法 | |
JP2005082653A (ja) | 熱可塑性樹脂成形体の製造方法及びその熱可塑性樹脂成形体からなる微多孔膜 | |
JP3953840B2 (ja) | ポリオレフィン微多孔膜の製造方法及びその製造方法によるポリオレフィン微多孔膜 | |
JP5057414B2 (ja) | 微多孔膜の製造方法及びその製造方法により得られる微多孔膜の用途 | |
JP4746773B2 (ja) | ポリオレフィン微多孔膜の製造方法 | |
JP2003003007A (ja) | 熱可塑性樹脂微多孔膜の製造方法 | |
JP4562074B2 (ja) | 電池用セパレータの製造方法 | |
JP2002012694A (ja) | 熱可塑性樹脂微多孔膜の製造方法 | |
JP4798730B2 (ja) | 熱可塑性樹脂微多孔膜の製造方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 200480025007.3 Country of ref document: CN |
|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2007012617 Country of ref document: US Ref document number: 10570265 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1020067004516 Country of ref document: KR |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2004772527 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 2004772527 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 1020067004516 Country of ref document: KR |
|
WWP | Wipo information: published in national office |
Ref document number: 10570265 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: JP |