WO2015186532A1 - Film poreux et sac de rangement - Google Patents

Film poreux et sac de rangement Download PDF

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Publication number
WO2015186532A1
WO2015186532A1 PCT/JP2015/064663 JP2015064663W WO2015186532A1 WO 2015186532 A1 WO2015186532 A1 WO 2015186532A1 JP 2015064663 W JP2015064663 W JP 2015064663W WO 2015186532 A1 WO2015186532 A1 WO 2015186532A1
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Prior art keywords
porous film
density polyethylene
parts
mass
low density
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PCT/JP2015/064663
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English (en)
Japanese (ja)
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幸一 長谷川
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三菱樹脂株式会社
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Priority to JP2016525766A priority Critical patent/JP6597608B2/ja
Priority to CN201580028867.0A priority patent/CN106414571B/zh
Publication of WO2015186532A1 publication Critical patent/WO2015186532A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
    • A61F7/02—Compresses or poultices for effecting heating or cooling
    • A61F7/03—Compresses or poultices for effecting heating or cooling thermophore, i.e. self-heating, e.g. using a chemical reaction
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • 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

Definitions

  • the present invention relates to a porous film and a storage bag comprising the porous film, and more specifically, a high-strength and thin-film porous film excellent in heat sealability, hot tackiness and air permeability, and the porous film. It is suitably used as a storage bag for storing heat-sealing materials such as disposable warmers and hot compresses by heat sealing.
  • JP-A-10-152570 discloses a porous film having excellent heat sealability used as the storage bag, together with polyethylene resin, ethylene-vinyl acetate copolymer (EVA), ethylene-ethyl acrylate copolymer.
  • EVA ethylene-vinyl acetate copolymer
  • EMA ethylene-methacrylic acid copolymer
  • Patent Document 2 contains a layer containing a low melting point metallocene polyethylene resin and a high melting point polyethylene resin as a porous film for a heat sealing bag constituting member.
  • a laminated porous film in which layers are laminated is provided.
  • the laminated porous film is improved in mechanical properties and heat sealability by providing the low melting point easy heat seal layer on the surface layer.
  • the porous film described in Patent Document 1 that is, an ethylene copolymer having a polar group such as EVA, EEA, and EMA, is excellent in adhesiveness with a base material, but has poor thermal stability. There are various problems such as generation of resin burns and yellowing of the porous film. Moreover, since the laminated porous film containing polyethylene with different melting points described in Patent Document 2 has a laminated structure, it is difficult to reuse and recycle defective products from resin raw materials, and there is a problem of low economic efficiency.
  • the peripheral edges of the porous film in the machine flow direction (MD) and the transverse direction (TD) are heat sealed.
  • the seal temperature control is a single control.
  • a general porous film is strongly oriented to MD by extrusion and stretching, MD and TD have different heat seal temperatures (thermal conductivity). Therefore, it is required to make the heat sealing temperature range wider and lower temperature to enable high-speed filling.
  • a heating element such as iron powder is filled immediately after heat sealing, hot tack property that prevents the bag from being broken even at a high temperature is important.
  • the ventilation heating elements such as disposable warmers and hot compresses may generate abnormal heat, and the user may receive low-temperature burns. Is important.
  • the appearance of the porous film is good, that is, there is no stretching unevenness and thickness unevenness and it is uniform.
  • causes of unevenness in stretching and thickness are the instability of the original fabric that occurs when the film is transported at high speed and formed into a film (sway of the film due to vibration of the transport), draw resonance (unstable extrusion of molten resin) Pulsation of extruded resin, etc.), variation in cooling and solidification, and defective or unstable operation of equipment.
  • the present invention has been made in view of the above-mentioned problems and importance, and has a performance required for a porous film used for a storage bag for a ventilating and exothermic substance such as a disposable body warmer and a hot compress. It is. That is, the present invention is a high-strength and thin film that does not use an ethylene copolymer having a polar group such as EVA, EEA, or EMA in addition to excellent heat sealability, hot tackiness, and quality stability. It is an object to provide a porous film having a layer structure and a storage bag made of the porous film.
  • the present invention provides 50 parts by mass or more of linear low density polyethylene (LLDPE), high pressure polymerization low density polyethylene (HP-LDPE) and metallocene linear low density polyethylene (m-LLDPE).
  • LLDPE linear low density polyethylene
  • HP-LDPE high pressure polymerization low density polyethylene
  • m-LLDPE metallocene linear low density polyethylene
  • MD machine flow direction
  • the porous film is characterized by having a heat seal temperature of 90 ° C. or higher and a heat seal maximum strength of 4.0 N / 50 mm or higher.
  • the linear low density polyethylene has a density of 0.910 to 0.940 g / cm 3 , a melting point of 110 to 130 ° C., a blending amount of 55 to 92 parts by mass
  • High-pressure polymerization low density polyethylene HP-LDPE
  • HP-LDPE High-pressure polymerization low density polyethylene
  • m- LLDPE metallocene linear low density polyethylene
  • the polyethylene resin composition used in the present invention preferably contains high density polyethylene (HDPE; density 0.940 to 0.970 g / cm 3 , melting point 125 to 145 ° C.).
  • the porous film of the present invention preferably has a basis weight of 10 to 100 g / m 2 . Furthermore, the porous film of the present invention has a difference TD (max) ⁇ which is the difference between the minimum fusion temperature MD (min) in the machine flow direction (MD) and the maximum fusion temperature TD (max) in the transverse direction (TD).
  • the MD (min) is preferably 1 ° C. or higher.
  • the porous film of the present invention is preferably a film that is made porous at a stretch ratio of 2.5 to 5.0 times in at least a uniaxial direction.
  • the present invention provides a storage bag of a ventilation exothermic substance including at least one layer of the porous film and having an opening edge bonded by heat sealing, and is particularly preferably used as a storage bag for a disposable body warmer. It is done.
  • the porous film of the present invention is a porous film that does not use an ethylene copolymer such as EVA, EEA, or EMA that is expensive and has poor thermal stability, it is excellent in economy and productivity. Further, it has a high strength and a thin film, and has a suitable air permeability and a heat sealing property and a hot tack property suitable for high-speed filling processing of a heating element, and can be more suitably used as a storage bag for a ventilation heat generating material.
  • gas_flowing exothermic substance of this invention is shown.
  • gas_flowing exothermic substance of this invention is shown.
  • the porous film of this invention contains the resin composition which mix
  • the polyethylene resin composition comprises 50 parts by mass or more of linear low density polyethylene (A) (LLDPE), high pressure polymerization low density polyethylene (B) (HP-LDPE) and metallocene linear low density polyethylene (C). (M-LLDPE) and a polyethylene resin composition containing less than 50 parts by mass in total.
  • the porous film of the present invention is a porous film containing a resin composition in which 50 to 200 parts by mass of an inorganic filler is blended with 100 parts by mass of the polyethylene resin composition, and has a machine flow direction (MD).
  • the heat seal temperature is 90 ° C. or higher, and the maximum heat seal strength is 4.0 N / 50 mm or higher.
  • the linear low density polyethylene (A) (LLDPE) serving as a base material preferably has a density of 0.910 to 0.940 g / cm 3 and a melting point of 110 to 130 ° C. Is preferably 55 to 92 parts by mass.
  • the high-pressure polymerization low-density polyethylene (B) (HP-LDPE) to be blended with the substrate preferably has a density of 0.910 to 0.930 g / cm 3 and a melting point of 100 to 120 ° C. The amount is preferably 3 to 15 parts by mass.
  • the metallocene linear low density polyethylene (C) (m-LLDPE) preferably has a density of 0.880 to 0.930 g / cm 3 and a melting point of 85 to 130 ° C. It is preferable that it is a mass part.
  • the polyethylene resin composition of the present invention does not contain any ethylene copolymer composed of EVA, EEA, and EMA.
  • the inorganic filler is preferably blended in an amount of 50 to 200 parts by weight, more preferably 60 to 150 parts by weight, with respect to 100 parts by weight of the polyethylene resin composition.
  • the blending amount of the inorganic filler is less than 50 parts by mass, it is difficult to develop an appropriate air permeability, and when it exceeds 200 parts by mass, the strength and waterproofness of the film are lowered.
  • Linear low density polyethylene (A) (LLDPE) used as the substrate examples include ethylene-propylene, ethylene- (1-butene), ethylene- (1-hexene), and ethylene- (4-methyl-1-pentene).
  • ethylene- ( ⁇ -olefin) copolymers such as ethylene- (1-octene) can be used.
  • Any linear low density polyethylene (excluding metallocene linear low density polyethylene (C)) polymerized by a conventional porous film polymerized by a multi-site catalyst such as Ziegler type or Philips type can be used. .
  • the linear low density polyethylene (A) is a DSC in which the density by the pycnometer method (JIS K7112B method) is set to 0.910 to 0.940 g / cm 3 and the scanning speed is set to 10 ° C./min.
  • the melting point according to the melting peak temperature (JIS K7121) when measured in (110) is preferably 110 to 130 ° C.
  • the MFR at 190 ° C. and a 2.16 kg load (JIS K7210 condition D) is preferably 0.5 to 10 g / 10 min.
  • the blending amount of the linear low-density polyethylene (A) is 50 parts by mass or more with respect to 100 parts by mass of the polyethylene resin composition. By being 50 mass parts or more, sufficient hot tack property can be ensured.
  • the upper limit is not particularly limited, but since it is preferable to blend the component (B) and the component (C) described later in detail, the blending amount of the component (A) is preferably 55 to 92. Part by mass, more preferably 60 to 80 parts by mass.
  • the high pressure polymerization low density polyethylene (B) (HP-LDPE) preferably has a density of 0.910 to 0.930 g / cm 3 and a melting point of 100 to 120 ° C.
  • the MFR is preferably 0.5 to 10 g / 10 min.
  • the component (B) is preferably blended in an amount of 3 to 15 parts by weight, more preferably 5 to 10 parts by weight, although the preferred blending amount varies depending on the molding method. Since the blending amount of the component (B) is in the range of 3 to 15 parts by mass, shaking of the original fabric, draw resonance, etc. that occur when the original fabric is conveyed at a high speed and formed into a film shape are suppressed. A porous film having a uniform thickness and air permeability can be obtained.
  • the said (B) component does not have limitation in particular, such as a manufacturer and a grade, A commercial item can be used arbitrarily.
  • Metallocene-based linear low-density polyethylene (C) (m-LLDPE) was polymerized with highly active single-site catalysts such as zirconocene, titanocene, hafnocene (collectively metallocene) Kaminsky catalyst, post metallocene catalyst, etc. It refers to an ethylene- ( ⁇ -olefin) copolymer.
  • the metallocene linear low density polyethylene (C) is characterized by improved kneadability and uniform dispersibility of the inorganic filler, improved molding processability to a thin film, low modulus and low melting point. This contributes to the improvement of low-temperature heat sealability, in addition to the reduction of stretching and uneven stretching, and is different from the function of the linear low-density polyethylene (A).
  • the metallocene linear low density polyethylene those having a density of 0.880 to 0.930 g / cm 3 and a melting point of 85 to 130 ° C. are preferably used in view of the above characteristics and purposes.
  • the density and melting point are smaller than the upper limit of the range, heat sealability, hot tack, uniformity of air permeability and the like are good, and when larger than the lower limit of the range, there is no extreme deterioration in mechanical properties, Troubles such as film-to-film blocking and fusion during molding process do not occur.
  • MFR is preferable from the viewpoints of uniform film formability by extrusion molding method, air permeability of the resulting porous film, uniformity of heat sealability, and prevention of breakage at the time of fusion due to a decrease in film mechanical strength.
  • the blending amount is preferably 5 to 30 parts by mass, and more preferably 15 to 30 parts by mass.
  • metallocene linear low density polyethylene examples include “Kernel” and “Harmolex” manufactured by Nippon Polyethylene Co., Ltd., “Evolue” manufactured by Prime Polymer Co., Ltd., and Sumitomo Chemical Co., Ltd. "Sumikasen E”, “Excellen FX”, “ELITE” manufactured by Dow Chemical Company, “Enable”, “Exceed” manufactured by Exxon Mobil Chemical Company, and the like.
  • high-density polyethylene (D) (HDPE) may be added to the polyethylene resin composition of the present invention.
  • the production method is not particularly limited, such as a low-pressure method (Ziegler method) and a medium-pressure method (Phillips method, standard method).
  • the high density polyethylene (D) has a density of 0.940 to 0.970 g / cm 3 , an MFR of 0.5 to 10 g / 10 min, a melting point of 125 to 145 ° C., and a blending amount of 3 to 30% by mass in the polyethylene resin composition. It is preferable that it is the range of these.
  • Examples of the inorganic filler to be blended in the polyethylene resin composition include fine particles such as calcium carbonate, calcium sulfate, barium carbonate, barium sulfate, titanium oxide, talc, clay, kaolinite, and montmorillonite, and minerals.
  • an inorganic filler composed of calcium carbonate and barium sulfate is suitably used because of the advantages of the porousness of the film to be produced, high versatility, low cost and variety of kinds.
  • the average particle size of the inorganic filler is preferably 0.5 to 5 ⁇ m, more preferably 0.8 to 3 ⁇ m.
  • the thickness By setting the thickness to 0.5 ⁇ m or more, there is no dispersion distribution failure and secondary aggregation, and uniform dispersion can be achieved. On the other hand, when the thickness is 5 ⁇ m or less, strength and water resistance can be sufficiently ensured without generating large voids when the film is thinned.
  • the inorganic filler is coated with fine particles of fatty acid, fatty acid ester or the like in advance so that the surface of the fine particles can be easily blended with the polyethylene resin.
  • additives may be added as necessary. Specifically, higher fatty acid, higher fatty acid ester, higher fatty acid amide, metal soap, higher alcohol, petrolatum, paraffin wax, glycerin fatty acid ester, polyglycerin fatty acid ester, sorbitan fatty acid ester, propylene glycol fatty acid ester, castor oil, hydrogenated castor oil Additives that favorably disperse plasticizers such as hardened castor oil, dehydrated castor oil, aromatic esters, aromatic amides and polyethers, low molecular weight polymers (oligomers) such as polyester, lubricants, and inorganic fillers.
  • plasticizers such as hardened castor oil, dehydrated castor oil, aromatic esters, aromatic amides and polyethers, low molecular weight polymers (oligomers) such as polyester, lubricants, and inorganic fillers.
  • compatibilizers In addition to the above additives, compatibilizers, processing aids, antioxidants, heat stabilizers, light stabilizers, ultraviolet absorbers, antiblocking agents, antifogging agents, matting agents, depending on the intended use
  • An appropriate amount of antibacterial agent, deodorant, antistatic agent, flame retardant, colorant, pigment, and the like may be added to the resin composition.
  • Method for producing porous film After mixing the above-mentioned polyethylene resin (linear low density polyethylene (A), high pressure polymerization method low density polyethylene (B), metallocene linear low density polyethylene (C)), inorganic filler, etc. with a mixer And melt kneading with a kneader. Specifically, after mixing for a required time with a mixer such as a tumbler mixer, mixing roll, Banbury mixer, ribbon blender, super mixer, etc., using a kneader such as a different direction twin screw extruder or the same direction twin screw extruder, Promotes uniform distribution of the kneaded product.
  • a mixer such as a tumbler mixer, mixing roll, Banbury mixer, ribbon blender, super mixer, etc.
  • polyethylene resin, inorganic filler and the like can be directly fed into an extruder and kneaded without being mixed and dispersed by a mixer.
  • the kneaded resin composition is preferably pelletized once by a method such as strand cutting or die cutting, but it may be formed into a film-like raw material through a die as it is.
  • the kneaded resin composition is made into a film-shaped raw material by a method such as melt extrusion.
  • the method for producing the film-shaped original fabric is not limited, and a film-shaped original fabric may be produced using a known method, but from the viewpoint of production efficiency, cost, etc., after melt extrusion of the resin composition, A method of forming into a film by a forming method such as inflation, tubular, or T-die is preferable, and inflation is more preferable.
  • a stretch opening method is common, but the method is not limited.
  • a known stretching method such as a biaxial stretching method such as a roll stretching method, a tenter method, a simultaneous method, or a sequential method can be applied. In the present invention, it may be carried out at least once in a uniaxial direction, or twice or more in consideration of stretching unevenness and air permeability.
  • the stretching temperature is preferably 0 to 90 ° C, more preferably 40 to 90 ° C.
  • the stretching ratio is preferably 2.5 to 5.0 times in total, and more preferably 3.0 to 4.5 times in total.
  • the porous film By setting the draw ratio to 2.5 times or more in total, a porous film that is drawn uniformly and has a sufficiently excellent appearance can be obtained. Therefore, when the porous film is used as a storage bag for a ventilation exothermic composition, the porous film has sufficiently uniform air permeability, so that abnormal heat generation of a ventilation heating element such as a disposable body warmer can be suppressed.
  • the stretch ratio is 5.0 or less in total, a heat-sealing property can be sufficiently secured when heat-sealing the four sides of the storage bag, and a porous film having a balanced mechanical property can be obtained. can get.
  • heat setting refers to suppressing the shrinkage of the product roll by heating the film in advance and causing the film to thermally shrink.
  • the roll stretching method there is a method in which the draw ratio (ratio of winding side roll speed / unwinding side roll speed) is set to a negative number while heating the stretched film with a heated roll (annealing roll).
  • the tenter stretching method the film is heated in the vicinity of the tenter exit, and the film is self-contracted by making the clip width at both ends narrower than the width after stretching.
  • the heat setting temperature in the present invention is preferably 70 to 120 ° C.
  • the negative draw ratio is preferably ⁇ 20 to ⁇ 5% in total, and if it is within the specified range, heat fixation can be performed without any trouble in production, and sufficient thermal dimensional stability can be obtained. Further, similarly to the stretching, the heat setting may be divided into a plurality of times.
  • the storage bag of the present invention is a storage bag of a ventilation exothermic composition containing at least one layer of the porous film of the present invention and having an opening edge bonded by heat sealing. More specifically, the storage bag of the present invention is a bag formed using the porous film of the present invention on the entire surface or one surface.
  • the storage bag can be in the form of a conventional bag (such as a four-sided bag, a three-sided bag, or a pillow bag) such as a bag formed by joining the edges of a porous film.
  • a fusion method is preferably used from the viewpoint of the production efficiency of the storage bag, etc., and heat fusion, ultrasonic fusion, etc.
  • a publicly known system can be adopted, and the storage bag of the present invention is bonded by heat sealing by heat sealing.
  • a storage bag 12 shown in FIGS. 1A and 1B is formed from the porous film 11 of the present invention, and uses the air permeability of the porous film 11 to store the ventilation heat-generating substance 13 of the disposable warmer 10. It is said.
  • the storage bag 12 is a four-sided bag, the ventilation heat-generating substance 13 of the disposable warmer 10 is disposed between the porous films 11 on both sides, and the four-side periphery is joined by a heat seal part 14 to form the disposable warmer 10. Yes.
  • a storage bag is not limited to a four-sided bag, It is good also as another above-mentioned bag form.
  • the air permeability of the porous film 11 used as a storage bag is 500 to 50,000 seconds / 100 ml so that the temperature is appropriate according to the site of the aeration exothermic substance 13 that generates heat based on the air permeability.
  • the air permeability refers to an air permeability measuring device (Asahi Seiko Co., Ltd., Oken type air permeability measuring device, EGO1-55 type) according to the method defined in JIS P8117 (Gurley tester method). ) Means the one specified by the measuring method.
  • the basis weight of the porous film 1 is preferably 10 to 100 g / m 2 , more preferably 30 to 100 g / m 2 , and still more preferably 40 to 80 g / m 2 .
  • the basis weight is 10 g / m 2 or more, the tensile strength, tear strength, and rigidity of the porous film can be sufficiently secured as a storage bag for a breathable exothermic substance such as a disposable body warmer or a hot compress.
  • a sufficient lightweight feeling can be obtained.
  • the heat seal temperature in the machine flow direction (MD) of the porous film 1 of the present invention is 90 ° C. or higher, preferably 95 ° C. or higher.
  • the heat seal temperature in this invention says what is measured by the method as described in an Example.
  • the heat seal maximum strength of the porous film 1 of the present invention is 4.0 N / 50 mm or more, and preferably 6.0 N / 50 mm or more.
  • problems such as breakage of the storage bag and exposure of the heating element can be sufficiently solved when used as a storage bag for a ventilating heat-generating substance such as a disposable body warmer or a warm compress.
  • the heat seal maximum strength in this invention says what is measured by the method as described in an Example.
  • the porous film of the present invention has a difference TD (max) that is a difference between the minimum fusion temperature MD (min) in the machine flow direction (MD) and the maximum fusion temperature TD (max) in the transverse direction (TD).
  • -MD (min) is preferably 1 ° C or higher.
  • this temperature difference is 1 ° C. or more
  • TD (max) ⁇ MD (min) is preferably 6 ° C. or more, and more preferably 10 ° C. or more.
  • Example and comparative example of this invention are described, this invention is not limited to these.
  • the raw materials and compositions of Examples 1 to 3 and Comparative Examples 1 to 5 are shown in Table 1.
  • LLDPE (A-1) Linear low-density polyethylene (A-1) uses Novatec LL UF230 (density 0.920 g / cm 3 , MFR 1.0 g / 10 min, melting point 122 ° C.) manufactured by Nippon Polyethylene Co., Ltd. did.
  • HP-LDPE High-pressure polymerization method
  • Low-density polyethylene B
  • Novatec LD LF441 density 0.923 g / cm 3 , MFR 2.3 g / 10 min, melting point 110 ° C.
  • m-LLDPE Metallocene linear low density polyethylene (C) uses Harmolex NF324A (density 0.906 g / cm 3 , MFR 1.0 g / 10 min, melting point 120 ° C.) manufactured by Nippon Polyethylene Co., Ltd. did.
  • HDPE As a high-density polyethylene (D), Novatec HD HF560 (density 0.962 g / cm 3 , MFR 6.0 g / 10 min, melting point 135 ° C.) manufactured by Nippon Polyethylene Co., Ltd. was used.
  • PP polypropylene
  • Novatec PP SA03 Density 0.901 g / cm 3 , MFR 36 g / 10 min, melting point 160 ° C.
  • Calcium carbonate (inorganic filler) Ryton BS-0 (average particle size 1.1 ⁇ m, fatty acid surface treatment) manufactured by Bihoku Flour Industry Co., Ltd. was used.
  • Plasticizer Hardened castor oil HCO-P manufactured by KEF Trading Co., Ltd. was used.
  • Thermal stabilizer IRGANOX B225 manufactured by BASF Japan Ltd. was used.
  • Examples 1 to 3 All the raw materials shown in Table 1 were put into a super mixer, mixed for a predetermined time, melt-kneaded at an extrusion temperature of 180 ° C. with a same-direction twin screw extruder, and compound pellets were obtained by a strand cut method. Thereafter, it was formed into a film by a single screw extruder and an inflation die. A porous film was obtained by performing uniaxial stretching in the MD direction at a stretching temperature of 76 ° C. and a stretching ratio of 3.50 times using a roll-type longitudinal stretching machine, and heat fixing at 90 ° C.
  • Comparative Example 1 As shown in Table 1, a porous film was obtained under the same production conditions as in Example 1 except that the metallocene linear low-density polyethylene (C) was not used.
  • Comparative Example 2 As shown in Table 1, a porous film was obtained under the same production conditions as in Example 1 except that a propylene homopolymer (PP) was used instead of the metallocene linear low-density polyethylene (C).
  • PP propylene homopolymer
  • C metallocene linear low-density polyethylene
  • Comparative Example 3 As shown in Table 1, except that a linear low density polyethylene (A-2; ethylene- (1-octene) copolymer) was used instead of the metallocene linear low density polyethylene (C). A porous film was obtained under the same production conditions as in Example 1.
  • A-2 linear low density polyethylene
  • C metallocene linear low density polyethylene
  • Comparative Example 4 As shown in Table 1, a porous film was obtained under the same production conditions as in Example 1 except that high-density polyethylene (D) was used instead of metallocene-based linear low-density polyethylene (C).
  • D high-density polyethylene
  • C metallocene-based linear low-density polyethylene
  • Comparative Example 5 As shown in Table 1, a porous film was obtained under the same production conditions as in Example 1 except that the high-pressure polymerization method low-density polyethylene (B) was not blended.
  • TD (max) ⁇ MD (min) is preferably 1 ° C. or higher, more preferably 6 ° C. or higher, and 0 ° C. or a negative number is not suitable for the processing method.
  • negative numbers are indicated by “ ⁇ ”.
  • Examples 1 to 3 have no stretching unevenness and are excellent in heat seal strength, hot tackiness, and appearance. Therefore, even when a heating element such as a disposable body warmer or a hot compress is filled, it can withstand practical production.
  • the storage bag is not broken or peeled off when the heating element is filled. It is excellent for high-speed production. This is considered to be the result of the addition of the metallocene-based linear low-density polyethylene (C) to the functions of elasticity reduction, suppression of stretching unevenness, and low-temperature heat sealability.
  • C metallocene-based linear low-density polyethylene
  • the maximum heat seal strength is 4.0 N / 50 mm or more, and it has sufficient strength during use from the time of manufacturing and filling processing.
  • Comparative Examples 1 to 5 are poor in heat seal strength and appearance of MD, and TD (max) ⁇ MD (min) is a negative number. Therefore, heat seal processing is difficult, and the storage bag is broken and the heating element is exposed. There are fears. Furthermore, since Comparative Example 5 did not contain high-pressure polymerization low-density polyethylene, when forming into a film at a high speed with an inflation die, the raw fabric (bubbles) vibrated unstablely, and the appearance of uneven thickness and stretch unevenness A defect occurred. A bubble is a cylindrical sheet (film) formed by an inflation method.
  • the porous film of the present invention has high strength and a thin film and is excellent in heat sealability, hot tackiness, and appearance, and therefore can be suitably used as a storage bag for aeration exothermic compositions such as disposable warmers and hot compresses.

Abstract

Cette invention concerne un film poreux comprenant une composition de résine dans laquelle de 50 à 200 parties en poids d'une charge inorganique ont été mélangées avec 100 parties en poids d'une composition de résine polyéthylène constituée d'un mélange d'au moins 50 parties en poids d'un polyéthylène linéaire basse densité (LLDPE) avec un total de moins de 50 parties en poids d'un polyéthylène basse densité polymérisé à haute pression (HP-LDPE) et un polyéthylène basse densité linéaire de type métallocène (m-LLDPE). Le film poreux est caractérisé en ce que la température de thermoscellage dans le sens d'écoulement mécanique (MD) est d'au moins 90°C et la résistance de thermoscellage maximale est d'au moins 4,0 N/50 mm.
PCT/JP2015/064663 2014-06-03 2015-05-21 Film poreux et sac de rangement WO2015186532A1 (fr)

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JP2016525766A JP6597608B2 (ja) 2014-06-03 2015-05-21 多孔質フィルムおよび収納袋
CN201580028867.0A CN106414571B (zh) 2014-06-03 2015-05-21 多孔膜及收纳袋

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JP2019119827A (ja) * 2018-01-10 2019-07-22 興人フィルム＆ケミカルズ株式会社 通気性フィルム
KR20190127183A (ko) * 2018-05-03 2019-11-13 장한봉 위조방지 qr코드가 인쇄된 기능성 쓰레기 봉투
KR102074619B1 (ko) * 2019-08-24 2020-02-07 주식회사 지엠상사 비닐 포장재
JP2020152424A (ja) * 2019-03-22 2020-09-24 三菱ケミカル株式会社 ヒートシール用フィルムおよび収納袋
CN114316418A (zh) * 2021-12-09 2022-04-12 成都金发科技新材料有限公司 一种低收缩阻燃聚乙烯组合物以及制备方法与应用
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WO2017175878A1 (fr) * 2016-04-08 2017-10-12 株式会社トクヤマ Film poreux étiré et son procédé de production
JPWO2017175878A1 (ja) * 2016-04-08 2019-02-14 株式会社トクヤマ 延伸多孔性フィルム及びその製造方法
JP2019119827A (ja) * 2018-01-10 2019-07-22 興人フィルム＆ケミカルズ株式会社 通気性フィルム
KR20190127183A (ko) * 2018-05-03 2019-11-13 장한봉 위조방지 qr코드가 인쇄된 기능성 쓰레기 봉투
KR102063956B1 (ko) 2018-05-03 2020-01-08 장한봉 위조방지 qr코드가 인쇄된 기능성 쓰레기 봉투
JP2020152424A (ja) * 2019-03-22 2020-09-24 三菱ケミカル株式会社 ヒートシール用フィルムおよび収納袋
JP2022531045A (ja) * 2019-05-03 2022-07-06 アールケイダブリュー エスイー 通気性フィルム
KR102074619B1 (ko) * 2019-08-24 2020-02-07 주식회사 지엠상사 비닐 포장재
CN114316418A (zh) * 2021-12-09 2022-04-12 成都金发科技新材料有限公司 一种低收缩阻燃聚乙烯组合物以及制备方法与应用
CN114316418B (zh) * 2021-12-09 2023-08-04 成都金发科技新材料有限公司 一种低收缩阻燃聚乙烯组合物以及制备方法与应用

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