WO2022059087A1 - ポリエチレン系樹脂組成物及びポリエチレン系樹脂包装材 - Google Patents
ポリエチレン系樹脂組成物及びポリエチレン系樹脂包装材 Download PDFInfo
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- WO2022059087A1 WO2022059087A1 PCT/JP2020/035049 JP2020035049W WO2022059087A1 WO 2022059087 A1 WO2022059087 A1 WO 2022059087A1 JP 2020035049 W JP2020035049 W JP 2020035049W WO 2022059087 A1 WO2022059087 A1 WO 2022059087A1
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- resin composition
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F210/00—Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F210/16—Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
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- 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
- C08L23/08—Copolymers of ethene
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- 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
- C08L23/08—Copolymers of ethene
- C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
- C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D29/00—Sacks or like containers made of fabrics; Flexible containers of open-work, e.g. net-like construction
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- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
- B29K2023/0608—PE, i.e. polyethylene characterised by its density
- B29K2023/065—HDPE, i.e. high density polyethylene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
- B29L2031/7128—Bags, sacks, sachets
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- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
Definitions
- the present invention relates to a polyethylene-based resin composition and a polyethylene-based resin packaging material.
- Patent Documents 1 and 2 disclose that calcium carbonate is added to the resin.
- the film containing calcium carbonate of Patent Document 1 and Patent Document 2 is inferior in bag making processability and film strength by heat sealing.
- the present invention is a polyethylene-based resin composition capable of obtaining a film having excellent moldability, bag-making processability and film strength even when an inorganic compound is added, and a polyethylene-based resin composition using the polyethylene-based resin composition. It is an object of the present invention to provide a resin packaging material.
- the present inventors were excellent in blending an inorganic compound by using an ethylene- ⁇ -olefin copolymer having a melt flow rate in a specific range and an ⁇ -olefin having 6 to 8 carbon atoms. It has been found that a polyethylene-based resin packaging material having excellent formability and bag-making processability and excellent film strength can be obtained.
- the polyethylene-based resin packaging material according to [4] which is a garbage bag, a plastic shopping bag, a fashion bag, a storage bag or a packaging bag.
- a polyethylene-based resin composition capable of obtaining a film having excellent moldability, bag-making processability and film strength even when an inorganic compound is added, and the polyethylene-based resin composition are used.
- a polyethylene-based resin packaging material can be provided.
- the polyethylene-based resin composition of the present invention contains an inorganic compound and an ethylene- ⁇ -olefin copolymer.
- the ethylene- ⁇ -olefin copolymer is a copolymer obtained by copolymerization using ethylene and ⁇ -olefin, and is preferably linear low density polyethylene (LLDPE). At least a part of the ethylene- ⁇ -olefin copolymer contained in the PE-based resin composition of the present invention has an ⁇ -olefin having 6 to 8 carbon atoms and a melt flow rate (MFR) of 0.8 g / g. It is an ethylene- ⁇ -olefin copolymer A (hereinafter, referred to as “copolymer A”) which is 10 minutes or more and 4.0 g / 10 minutes or less.
- copolymer A ethylene- ⁇ -olefin copolymer A
- the number of carbon atoms of the ⁇ -olefin used in the copolymer A is 6 or more and 8 or less.
- Specific examples of the ⁇ -olefin used in the copolymer A include 1-hexene and 1-octene.
- the ⁇ -olefin used for the copolymer A may be one kind or two or more kinds.
- the MFR of the copolymer A is 0.8 g / 10 minutes or more and 4.0 g / 10 minutes or less, preferably 0.8 g / 10 minutes or more and 2.0 g / 10 minutes or less, and 0.8 g / 10 minutes or more 1 .5 g / 10 minutes or less is more preferable, and 0.8 g / 10 minutes or more and 1.2 g / 10 minutes or less is further preferable.
- the MFR of the copolymer A is at least the lower limit of the above range, excellent moldability can be ensured even if the molding temperature is low, so that deterioration of the copolymer A can be suppressed.
- the MFR of the copolymer A is not more than the upper limit of the above range, the melt tension does not become too low, so that film forming becomes easy.
- the MFR is a value obtained by applying a load of 2.16 kg to a resin (polymer) heated to 190 ° C. and measuring the amount of resin flowing out from an orifice having a diameter of 2.09 mm in 10 minutes.
- the melting point of the copolymer A is preferably 90 ° C. or higher and 130 ° C. or lower, and more preferably 100 ° C. or higher and 125 ° C. or lower.
- the melting point of the copolymer A is at least the lower limit of the above range, the seal shape at the time of bag making by heat sealing becomes good.
- the melting point of the copolymer A is not more than the upper limit of the above range, the heat sealing time can be shortened and the bag making speed (production speed) is improved.
- the melting point is the temperature corresponding to the melting peak measured by the differential scanning calorimetry (DSC) method.
- the copolymer A for example, among LLDPE (C6-LLDPE) in which the ⁇ -olefin has 6 carbon atoms and LLDPE (C8-LLDPE) in which the ⁇ -olefin has 8 carbon atoms, MFR falls within the above range. An example of what is satisfied.
- the copolymer A contained in the PE-based resin composition may be one kind or two or more kinds.
- the method for producing the copolymer A is not particularly limited, and for example, polymerization using a Cheegler-type catalyst mainly composed of a transition metal such as titanium, polymerization using a Phillips-type catalyst mainly composed of a chromium-based catalyst, and a metallocene-based catalyst are used. Polymerization using a Kaminsky-type catalyst mainly composed of a catalyst can be exemplified.
- the polymerization method may be any of a solution polymerization method, a slurry polymerization method, a gas phase polymerization method and a high pressure ion polymerization method. Further, it may be a one-stage polymerization or a multi-stage polymerization of two or more stages.
- the PE-based resin composition of the present invention may contain an ethylene- ⁇ -olefin copolymer other than the copolymer A.
- the other ethylene- ⁇ -olefin copolymer is not particularly limited, and for example, an ethylene- ⁇ -olefin copolymer having 4 carbon atoms in the ⁇ -olefin can be exemplified, and the ⁇ -olefin has 4 carbon atoms.
- LLDPE C4-LLDPE
- the ethylene- ⁇ -olefin copolymer other than the copolymer A contained in the PE-based resin composition may be one kind or two or more kinds.
- the PE-based resin composition of the present invention includes high-density polyethylene (HDPE), low-density polyethylene (LDPE), and ultra-low-density polyethylene (VLDPE) as long as the effects of the present invention are not impaired.
- HDPE high-density polyethylene
- LDPE low-density polyethylene
- VLDPE ultra-low-density polyethylene
- Ethylene-vinyl acetate resin (EVA), ethylene-vinyl alcohol copolymer (EVOH), ethylene-propylene copolymer and the like may be contained.
- the resin components contained in the PE-based resin composition of the present invention include only the copolymer A, the combination of the copolymer A and C4-LLDPE, the combination of the copolymer A and HDPE, and the copolymer A and C4-LLDPE. And HDPE are preferred.
- the content of the copolymer A in the PE-based resin composition is 10% by mass or more and 50% by mass or less, preferably 13% by mass or more and 50% by mass or less, based on the total mass of the PE-based resin composition. It is more preferably 16% by mass or more and 50% by mass or less.
- the content of the copolymer A is at least the lower limit of the above range, sufficient film strength can be obtained.
- the content of the copolymer A is not more than the upper limit of the above range, the effect of suppressing the amount of the resin used can be sufficiently obtained.
- the content of C4-LLDPE in the PE-based resin composition is 10% by mass or more and 40% by mass with respect to the total mass of the PE-based resin composition. The following is preferable, and 20% by mass or more and 40% by mass or less is more preferable.
- the content of C4-LLDPE is at least the lower limit of the above range, stable moldability can be obtained.
- the content of C4-LLDPE is not more than the upper limit of the above range, the effect of suppressing the amount of resin used can be sufficiently obtained.
- the content of HDPE in the PE-based resin composition is preferably 5% by mass or more and 20% by mass or less with respect to the total mass of the PE-based resin composition. More preferably, it is 5% by mass or more and 15% by mass or less.
- the content of HDPE is at least the lower limit of the above range, the bag-making property of the film is stable.
- the content of HDPE is not more than the upper limit of the above range, the effect of suppressing the amount of resin used can be sufficiently obtained.
- the content of the total resin component in the PE-based resin composition is preferably 20% by mass or more and 50% by mass or less, more preferably 25% by mass or more and 50% by mass or less, based on the total mass of the PE-based resin composition. More preferably, it is 30% by mass or more and 50% by mass or less.
- the content of all resin components is at least the lower limit of the above range, sufficient film strength can be easily obtained.
- the content of all resin components is not more than the upper limit of the above range, the effect of suppressing the amount of resin used can be sufficiently obtained.
- the inorganic compound contained in the PE-based resin composition is not particularly limited, and examples thereof include calcium carbonate, titanium oxide, silica, clay, talc, kaolin, and aluminum hydroxide. Of these, calcium carbonate is preferable.
- the inorganic compound one kind may be used alone, or two or more kinds may be used in combination.
- the calcium carbonate may be so-called heavy calcium carbonate obtained by mechanically crushing limestone, or may be so-called precipitated calcium carbonate obtained by the carbon dioxide gasification method.
- the calcium carbonate may be surface-treated or unsurface-treated.
- As the calcium carbonate one type may be used alone, or two or more types may be used in combination.
- the average particle size of calcium carbonate is preferably 5.0 ⁇ m or less, more preferably 3.0 ⁇ m or less.
- the lower limit of the average particle size of calcium carbonate is preferably 0.1 ⁇ m.
- the average particle size of calcium carbonate is preferably 0.1 ⁇ m or more and 5.0 ⁇ m or less.
- the average particle size of calcium carbonate is measured by an air permeation method.
- the top cut particle size of calcium carbonate is preferably 15 ⁇ m or less, more preferably 10 ⁇ m or less.
- the top cut particle size is measured by an X-ray transmission type particle size distribution measuring device.
- the 45 ⁇ m sieve residue of calcium carbonate is preferably 0.01% by mass or less.
- the 45 ⁇ m sieve residue is measured by a JIS standard sieve.
- the content of the inorganic compound in the PE-based resin composition of the present invention is 50% by mass or more and 80% by mass or less, preferably 50% by mass or more and 75% by mass or less, preferably 50% by mass or less, based on the total mass of the resin composition. More preferably, it is by mass or more and 70% by mass or less.
- the content of the inorganic compound is at least the lower limit of the above range, the effect of suppressing the amount of resin used can be sufficiently obtained.
- the content of the inorganic compound is not more than the upper limit of the above range, sufficient film strength can be obtained.
- the PE-based resin composition of the present invention may contain an additive, if necessary.
- the additive include antioxidants, light stabilizers, lubricants, dispersants, pigments, antistatic agents, and repellents for animals.
- the additive may be one kind or two or more kinds.
- the content of the additive in the PE-based resin composition of the present invention is preferably 3% by mass or less, more preferably 1% by mass or less, based on the total mass of the PE-based resin composition.
- the method for producing the PE-based resin composition of the present invention is not particularly limited, and examples thereof include a method of mixing each component with a single-screw extruder, a multi-screw extruder, a Banbury mixer, a kneader, or the like.
- a masterbatch is prepared by premixing a part of the resin component other than the copolymer A and the resin component other than the copolymer A used as necessary with an inorganic compound or an additive, and the rest of the masterbatch and the resin component. And may be mixed.
- the mixing temperature at the time of producing the PE-based resin composition can be appropriately adjusted, and can be, for example, 150 ° C. or higher and 190 ° C. or lower.
- the polyethylene-based resin packaging material of the present invention (hereinafter referred to as “PE-based resin packaging material”) is a packaging material formed by the PE-based resin composition of the present invention.
- PE-based resin packaging material As the embodiment of the PE-based resin packaging material of the present invention, known embodiments can be adopted except that the PE-based resin composition of the present invention is used.
- the use of the PE-based resin packaging material is not particularly limited, and examples thereof include garbage bags, shopping bags, fashion bags, storage bags, and packaging bags.
- the method for producing the PE-based resin packaging material of the present invention a known method can be adopted except that the PE-based resin composition of the present invention is used.
- a method of forming the PE-based resin composition of the present invention into a film and making a bag by heat sealing can be exemplified.
- the method of forming into a film for example, inflation molding, T-die extrusion molding and the like can be exemplified.
- the molding temperature can be appropriately adjusted, and can be, for example, 150 ° C. or higher and 190 ° C. or lower.
- the thickness of the film may be appropriately set according to the intended use, and may be, for example, 10 ⁇ m or more and 70 ⁇ m or less.
- the PE-based resin composition contains a specific copolymer A in a specific ratio.
- excellent moldability can be ensured even if the content of the inorganic compound is large, and a film having excellent bag-making processability and film strength can be obtained.
- the PE-based resin packaging material obtained by using the PE-based resin composition of the present invention can be produced with high productivity and can withstand the packaging and transportation of heavy objects.
- A-4 C6-LLDPE, trade name "Evolu (registered trademark) 2320", manufactured by Prime Polymers, MFR: 1.8 g / 10 minutes, melting point: 118 ° C.
- A-5 C8-LLDPE, trade name "Moretech (registered trademark) 0168N", manufactured by Prime Polymers, MFR: 1.2 g / 10 minutes, melting point: 125 ° C.
- A-6 C8-LLDPE, trade name "0138NK", manufactured by Prime Polymers, MFR: 1.5 g / 10 minutes, melting point: 117 ° C.
- B-1 C4-LLDPE, trade name "FS153S”, manufactured by Sumitomo Chemical Asia.
- B-2 C6-LLDPE, trade name "TZ050", manufactured by Tosoh Corporation, MFR: 0.5 g / 10 minutes, melting point: 119 ° C.
- B-3 C6-LLDPE, trade name "Harmorex NH645A”, manufactured by Japan Polyethylene Corporation, MFR: 8.0 g / 10 minutes, melting point: 121 ° C.
- B-4 HDPE, trade name "FJ0952”, manufactured by Saudi Basic Industries Corporation.
- a masterbatch (MB-2) was obtained in the same manner as in Production Example 1 except that the copolymer A-4 (C6-LLDPE) was used instead of the copolymer A-5.
- a masterbatch (MB-3) was obtained in the same manner as in Production Example 1 except that the polymer B-1 (C4-LLDPE) was used instead of the copolymer A-5.
- Example 1 As an inflation forming machine, an extruder having a cylinder inner diameter of 55 mm and a screw L / D of 32 (manufactured by PLACO Co., Ltd.) and an annular die having a die diameter of 100 mm ⁇ and a lip of 3 mm were used. Inflation molding is performed while weighing them and charging them into an extruder to prepare a PE-based resin composition so that MB-1 is 65% by mass and polymer B-1 (C4-LLDPE) is 35% by mass. A tubular film having a thickness of 30 ⁇ m and a folding width of 460 mm was formed. The extrusion temperature was 170 ° C. and the blow ratio was about 3.0.
- a bag body was produced by heat-sealing and then cutting at intervals of 600 mm in the length direction using a bag-making machine (manufactured by Nozaki Kogyo).
- the heat seal temperature was 160 ° C to 180 ° C.
- the content of calcium carbonate in the film (PE-based resin composition) was 52% by mass, and the content of the copolymer A was 13% by mass.
- Examples 2 to 6 A bag was prepared in the same manner as in Example 1 except that the composition of the PE-based resin composition was changed as shown in Table 1.
- Example 7 to 10 A bag was prepared in the same manner as in Example 1 except that the composition of the PE-based resin composition was changed as shown in Table 1 and the film thickness was 20 ⁇ m.
- Tables 1 and 2 show the composition of the PE-based resin composition of each example, the thickness of the film, and the evaluation results.
- "LLDPE (C6 to C8)” means LLDPE having 6 to 8 carbon atoms in the ⁇ -olefin.
- the "CaCO 3 content” means the content of calcium carbonate in the PE-based resin composition (film).
- the "LLDPE (C6 to C8) content” means the total content of LLDPE having 6 to 8 carbon atoms of the ⁇ -olefin in the PE-based resin composition (film).
- the "copolymer A content” means the content of the copolymer A in the PE-based resin composition (film).
- 1.0, 1, 2 in the column of MFR means that LLDPE with MFR of 1.0 g / 10 min and LLDPE with MFR of 1.2 g / 10 min are used in combination, and others.
- the column of. “90,118” in the melting point column means that LLDPE having a melting point of 90 ° C. and LLDPE having a melting point of 118 ° C. are used in combination, and the same applies to the other columns.
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Abstract
Description
[1]無機化合物と、エチレン-α-オレフィン共重合体とを含む樹脂組成物であって、前記エチレン-α-オレフィン共重合体の少なくとも一部は、α-オレフィンの炭素数が6~8であり、かつメルトフローレートが0.8g/10分以上4.0g/10分以下であるエチレン-α-オレフィン共重合体Aであり、前記無機化合物の含有量が、前記樹脂組成物の総質量に対して50質量%以上80質量%以下であり、前記エチレン-α-オレフィン共重合体Aの含有量が、前記樹脂組成物の総質量に対して10質量%以上50質量%以下である、ポリエチレン系樹脂組成物。
[2]前記エチレン-α-オレフィン共重合体Aの融点が90℃以上130℃以下である、[1]に記載のポリエチレン系樹脂組成物。
[3]前記無機化合物が炭酸カルシウムである、[1]又は[2]に記載のポリエチレン系樹脂組成物。
[4][1]~[3]のいずれかに記載のポリエチレン系樹脂組成物により形成されたポリエチレン系樹脂包装材。
[5]ゴミ袋、レジ袋、ファッションバッグ、収納袋又は包装袋である、[4]に記載のポリエチレン系樹脂包装材。
本発明のポリエチレン系樹脂組成物(以下、「PE系樹脂組成物」と記す。)は、無機化合物と、エチレン-α-オレフィン共重合体とを含む。
なお、MFRは、190℃に加熱した樹脂(重合体)に荷重2.16kgの荷重をかけ、直径2.09mmのオリフィスから10分間で流れ出る樹脂の量を測定した値である。
なお、融点は、示差走査熱量測定(DSC)法で測定した融解ピークに対応する温度である。
PE系樹脂組成物に含まれる共重合体Aは、1種でもよく、2種以上でもよい。
炭酸カルシウムの45μm篩残渣は、好ましくは0.01質量%以下である。なお、45μm篩残渣は、JIS標準ふるいによって測定される。
本発明のPE系樹脂組成物中の添加剤の含有量は、PE系樹脂組成物の総質量に対して、3質量%以下が好ましく、1質量%以下がより好ましい。
PE系樹脂組成物の製造時の混合温度は、適宜調整でき、例えば、150℃以上190℃以下とすることができる。
本発明のポリエチレン系樹脂包装材(以下、「PE系樹脂包装材」と記す。)は、本発明のPE系樹脂組成物によって形成された包装材である。本発明のPE系樹脂包装材の態様は、本発明のPE系樹脂組成物を用いる以外は、公知の態様を採用できる。
PE系樹脂包装材の用途としては、特に限定されず、例えば、ゴミ袋、レジ袋、ファッションバッグ、収納袋、包装袋を例示できる。
フィルムの厚さは、用途に応じて適宜設定すればよく、例えば、10μm以上70μm以下とすることができる。
以下の略号は、以下の意味を示す。
(共重合体A)
A-1:C6-LLDPE、商品名「ノバテックSF720」、日本ポリエチレン社製、MFR:0.8g/10分、融点:124℃。
A-2:C6-LLDPE、商品名「ハーモレックスNC564A」、日本ポリエチレン社製、MFR:3.5g/10分、融点:124℃。
A-3:C6-LLDPE、商品名「D139FK」、Chevron Phillips Chemical社製、MFR:1.0g/10分、融点:90℃。
A-4:C6-LLDPE、商品名「エボリュー(登録商標)2320」、Prime Polymers社製、MFR:1.8g/10分、融点:118℃。
A-5:C8-LLDPE、商品名「モアテック(登録商標)0168N」、Prime Polymers社製、MFR:1.2g/10分、融点:125℃。
A-6:C8-LLDPE、商品名「0138NK」、Prime Polymers社製、MFR:1.5g/10分、融点:117℃。
B-1:C4-LLDPE、商品名「FS153S」、Sumitomo Chemical Asia社製。
B-2:C6-LLDPE、商品名「TZ050」、東ソー社製、MFR:0.5g/10分、融点:119℃。
B-3:C6-LLDPE、商品名「ハーモレックスNH645A」、日本ポリエチレン社製、MFR:8.0g/10分、融点:121℃。
B-4:HDPE、商品名「FJ00952」、Saudi Basic Industries Corporation製。
炭酸カルシウム(ライトンBS-0、平均粒径1.0μm、備北粉化工業社製)80質量%、及び共重合体A-5(C8-LLDPE)ペレット20質量%をスーパーミキサーで5分間混合した後、2軸押出機によりストランド状に押出し、ペレット状に切断してマスターバッチ(MB-1)を得た。
共重合体A-5の代わりに、共重合体A-4(C6-LLDPE)を用いた以外は、製造例1と同様にしてマスターバッチ(MB-2)を得た。
共重合体A-5の代わりに、重合体B-1(C4-LLDPE)を用いた以外は、製造例1と同様にしてマスターバッチ(MB-3)を得た。
インフレーション成形機として、シリンダーの内径が55mm、スクリューのL/Dが32の押出機(プラコー社製)と、ダイス径100mmφ、リップ3mmの環状ダイを使用した。
MB-1が65質量%、重合体B-1(C4-LLDPE)が35質量%となるように、それらを計量しながら押出機に投入してPE系樹脂組成物を調製しつつ、インフレーション成形にて厚さ30μm、折幅460mmのチューブ状のフィルムを成形した。押出温度は170℃とし、ブロー比は約3.0とした。次いで、製袋機(野崎工業製)によって長さ方向に600mm間隔でヒートシール後にカットして袋体を作製した。ヒートシール温度は、160℃~180℃とした。
フィルム(PE系樹脂組成物)中の炭酸カルシウムの含有量は52質量%であり、共重合体Aの含有量は13質量%であった。
PE系樹脂組成物の組成を表1に示すとおりに変更した以外は、実施例1と同様にして袋体を作製した。
PE系樹脂組成物の組成を表1に示すとおりに変更し、フィルムの厚さを20μmとした以外は、実施例1と同様にして袋体を作製した。
PE系樹脂組成物の組成を表2に示すとおりに変更した以外は、実施例1と同様にして袋体を作製した。
各例のフィルム成形時のチューブの安定性を確認し、以下の基準に従って成形性を評価した。
「1」:通常樹脂(無機化合物を含まないもの)よりも安定している。
「2」:通常樹脂と同様に安定している。
「3」:通常樹脂よりも多少不安定であるが連続成形できる。
「4」:不安定で成形できない。
製袋時の生産速度とシール部の仕上がり形状を確認し、以下の基準に従って成形性を評価した。
「1」:無機物が無い場合よりも生産速度及びシール部の仕上りが向上している。
「2」:無機物がない場合と同等。
「3」:無機物がない場合と比べてシール形状の仕上がりが悪い。
「4」:無機物がない場合と比べて生産速度が非常に劣る。
各例で成形したフィルムを親指で突き刺し、突き刺した穴に力をかけたときの破れの広がりを確認して、以下の基準に従ってフィルム強度を評価した。
(評価基準)
「1」:容易に突刺せない。
「2」:突き刺した穴から破れが広がらない。
「3」:突き刺した穴から破れが広がる。
「4」:指で容易に突き刺せる。
なお、表1及び表2において、「LLDPE(C6~C8)」とは、α-オレフィンの炭素数が6~8であるLLDPEを意味する。「CaCO3含有量」とは、PE系樹脂組成物(フィルム)中の炭酸カルシウムの含有量を意味する。「LLDPE(C6~C8)含有量」とは、PE系樹脂組成物(フィルム)中のα-オレフィンの炭素数が6~8であるLLDPEの合計含有量を意味する。「共重合体A含有量」とは、PE系樹脂組成物(フィルム)中の共重合体Aの含有量を意味する。MFRの欄における「1.0,1,2」とは、MFRが1.0g/10分のLLDPEと、MFRが1.2g/10分のLLDPEとを併用していることを意味し、他の欄も同様である。融点の欄における「90,118」とは、融点が90℃のLLDPEと、融点が118℃のLLDPEとを併用していることを意味し、他の欄も同様である。
一方、PE系樹脂組成物が共重合体Aを含まない比較例1~4、及び、PE系樹脂組成物中の共重合体Aの含有量が少ない比較例5は、フィルム成形性、製袋加工性及びフィルム強度のうちの1つ以上が劣っていた。
Claims (5)
- 無機化合物と、エチレン-α-オレフィン共重合体とを含む樹脂組成物であって、
前記エチレン-α-オレフィン共重合体の少なくとも一部は、α-オレフィンの炭素数が6~8であり、かつメルトフローレートが0.8g/10分以上4.0g/10分以下であるエチレン-α-オレフィン共重合体Aであり、
前記無機化合物の含有量が、前記樹脂組成物の総質量に対して50質量%以上80質量%以下であり、
前記エチレン-α-オレフィン共重合体Aの含有量が、前記樹脂組成物の総質量に対して10質量%以上50質量%以下である、ポリエチレン系樹脂組成物。 - 前記エチレン-α-オレフィン共重合体Aの融点が90℃以上130℃以下である、請求項1に記載のポリエチレン系樹脂組成物。
- 前記無機化合物が炭酸カルシウムである、請求項1又は2に記載のポリエチレン系樹脂組成物。
- 請求項1~3のいずれか一項に記載のポリエチレン系樹脂組成物により形成されたポリエチレン系樹脂包装材。
- ゴミ袋、レジ袋、ファッションバッグ、収納袋又は包装袋である、請求項4に記載のポリエチレン系樹脂包装材。
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PCT/JP2020/035049 WO2022059087A1 (ja) | 2020-09-16 | 2020-09-16 | ポリエチレン系樹脂組成物及びポリエチレン系樹脂包装材 |
US18/026,070 US20230357465A1 (en) | 2020-09-16 | 2020-09-16 | Polyethylene-based-resin composition and polyethylene-based-resin packaging material |
CN202080106882.3A CN116406342A (zh) | 2020-09-16 | 2020-09-16 | 聚乙烯系树脂组合物及聚乙烯系树脂包装材料 |
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0517636A (ja) * | 1991-07-15 | 1993-01-26 | Maruzen Polymer Kk | 無機質充填ポリエチレンフイルム用組成物 |
JPH07206005A (ja) * | 1993-12-29 | 1995-08-08 | Nippon Petrochem Co Ltd | ゴミ袋 |
JP2000256517A (ja) * | 1999-03-11 | 2000-09-19 | Maruzen Petrochem Co Ltd | 回収ポリエチレンテレフタレート樹脂を含む樹脂組成物および該樹脂組成物から製造されたフィルム |
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JPH0733152A (ja) * | 1993-07-16 | 1995-02-03 | Mitsubishi Chem Corp | 包装袋及びその製造方法 |
JP3109056B2 (ja) * | 1993-10-19 | 2000-11-13 | 三菱化学株式会社 | 通気性樹脂フィルム |
JP3244907B2 (ja) * | 1993-12-29 | 2002-01-07 | 日本石油化学株式会社 | 易焼却性ゴミ袋 |
JPH10212377A (ja) * | 1997-01-30 | 1998-08-11 | Nippon Porikemu Kk | 電線被覆用組成物 |
JP2002003661A (ja) * | 2000-06-16 | 2002-01-09 | Japan Polyolefins Co Ltd | ポリエチレン樹脂組成物、そのフィルム、多孔フィルム、成形体、および多孔フィルムの製造方法 |
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Publication number | Priority date | Publication date | Assignee | Title |
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JPH0517636A (ja) * | 1991-07-15 | 1993-01-26 | Maruzen Polymer Kk | 無機質充填ポリエチレンフイルム用組成物 |
JPH07206005A (ja) * | 1993-12-29 | 1995-08-08 | Nippon Petrochem Co Ltd | ゴミ袋 |
JP2000256517A (ja) * | 1999-03-11 | 2000-09-19 | Maruzen Petrochem Co Ltd | 回収ポリエチレンテレフタレート樹脂を含む樹脂組成物および該樹脂組成物から製造されたフィルム |
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