CN113767137A

CN113767137A - Polyethylene resin film

Info

Publication number: CN113767137A
Application number: CN202080030669.9A
Authority: CN
Inventors: 大木祐和; 西忠嗣
Original assignee: Toyobo Co Ltd
Current assignee: Toyobo Co Ltd
Priority date: 2019-04-26
Filing date: 2020-04-03
Publication date: 2021-12-07
Anticipated expiration: 2040-04-03
Also published as: CN113767137B; WO2020217931A1; KR20220004822A; JPWO2020217931A1; TW202043359A

Abstract

Providing: a polyethylene resin film which is excellent in heat sealability, blocking resistance and slidability, has a very small amount of residue generated during film burning, and is excellent in appearance and scratch resistance. A polyethylene resin film having at least an A layer comprising a polyethylene resin composition, wherein the polyethylene resin composition constituting the A layer satisfies the following 1) to 3), and the surface of the A layer satisfies the following 4) and 5). 1) Comprising a density of 900kg/m³Above and 935kg/m³The following polyethylene resin. 2) Comprises particles comprising a polyethylene resin. 3) The content of the organic lubricant is 0.16 wt% or more. 4) The three-dimensional surface roughness SRa is 0.05-0.2 μm. 5) The maximum protrusion height SRmax is 2-15 μm.

Description

Polyethylene resin film

Technical Field

The present invention relates to a polyethylene resin film, and a laminate and a package using the same.

Background

In recent years, packages or containers using films have been used in a wide range of fields for convenience, resource saving, reduction in environmental load, and the like. The film is advantageous in that it is light in weight, easy to dispose of, and low in cost, as compared with conventional molded containers and molded articles.

The sealant film is generally used by laminating a substrate film such as a biaxially stretched nylon film, a biaxially stretched ester film, or a biaxially stretched polypropylene film, which is inferior in thermal adhesiveness at low temperature to the sealant film. When the film is stored in a roll form after being laminated with these base films, the sealant film and the base film are stuck to each other, and before the bag-making process, the laminated film is not easily unwound, or the sealant films forming the inner surfaces of the bag during the bag-making process are stuck to each other, and the bag is not easily filled with food.

Therefore, it is known that the adhesion between the sealant film and the base material and the adhesion between the sealant films are avoided by scattering starch or the like on the surface of the sealant film.

However, this measure not only contaminates the periphery of the thin film processing apparatus, but also causes the following problems: the appearance of the packaged food is remarkably deteriorated, or the powder attached to the sealant film is directly mixed into the package together with the food, or the heat seal strength is lowered.

Therefore, a polyethylene resin film using inorganic fine powder such as silica or inorganic fine particles as a polyethylene resin has been reported.

However, in this measure, there are problems that scratches are easily generated when film surfaces containing inorganic fine powders such as silica or inorganic particles added to a polyethylene resin film are rubbed against each other, and that scratches and foreign matter problems are easily generated when inorganic fine powders or inorganic particles are dropped off from a laminate of a sealant film or a laminate of a sealant film and a base film by a laminator, a bag-making machine, or the like.

Further, it is reported that: a polyethylene resin film using organically crosslinked particles of a copolymer mainly composed of an acrylic monomer and a styrene monomer.

However, in this measure, the scratch easiness is not as poor as that of the inorganic particles, but it cannot be said that it is sufficient. In addition, there remains a problem of falling off of particles.

Further, in order to improve the blocking resistance of a polyethylene resin film, it has been reported that a low-density polyethylene resin or a high-density polyethylene resin is added to a linear low-density polyethylene resin (see, for example, patent documents 1 and 2).

However, these measures have problems such as deterioration of mechanical strength characteristics such as tensile strength and transparency, and also poor blocking resistance.

Further, it is reported that: a polyethylene resin film comprising particles of a high-molecular-weight polyethylene resin added to a high-density polyethylene resin.

However, this countermeasure has the following problems: mechanical strength characteristics such as tear strength, heat sealability at low temperatures and transparency are poor, and addition of pellets comprising a polyethylene resin rather destabilizes blocking resistance and sliding properties.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 10-120849

Patent document 2: japanese laid-open patent publication No. 10-87909

Disclosure of Invention

Problems to be solved by the invention

An object of the present invention is to provide: a polyethylene resin film which is excellent in appearance, heat sealability, stable blocking resistance and stable slidability and is also excellent in scratch resistance. Another object of the present invention is to provide: a laminate and a package using the polyethylene resin film.

Means for solving the problems

The present inventors have conducted intensive studies and, as a result, have found that: the above object can be achieved by controlling the protrusion height and the organic lubricant content of the surface of a layer formed of a polyethylene resin composition containing a polyethylene resin having a density within a specific range and particles of the polyethylene resin, and the present invention has been achieved.

That is, the present invention is a polyethylene resin film having at least one layer a comprising a polyethylene resin composition, the polyethylene resin composition constituting the layer a satisfies the following 1) to 3), and at least one surface of the layer a satisfies the following 4) and 5).

1) Comprising a density of 900kg/m³Above and 935kg/m³The following polyethylene resin.

2) Comprises particles comprising a polyethylene resin.

3) The content of the organic lubricant is 0.16 wt% or more.

4) The three-dimensional surface roughness SRa is 0.05-0.2 μm.

5) The maximum mountain height SRmax is 2-15 μm.

Another embodiment of the present invention is a polyethylene resin film comprising at least one layer a comprising a polyethylene resin composition, wherein the polyethylene resin composition constituting the layer a satisfies the following 1) to 3), and at least one surface of the layer a satisfies the following 4) and 5).

1) The density is 900kg/m³Above and 935kg/m³The following.

2) Comprises particles comprising a polyethylene resin.

3) The content of the organic lubricant is 0.16 wt% or more.

4) The three-dimensional surface roughness SRa is 0.05-0.2 μm.

5) The maximum mountain height SRmax is 2-15 μm.

In this case, the resin hardness of the polyethylene resin-containing particles is preferably D70 or less. The polyethylene resin multilayer film according to claim 1 or 2.

In this case, the polyethylene resin-containing particles preferably have a viscosity average molecular weight of 150 ten thousand or more and a melting point peak temperature by DSC of 150 ℃.

Further, in this case, the polyethylene resin-containing particles preferably have an average particle diameter of 5 to 15 μm.

In this case, the polyethylene resin composition constituting the layer a preferably contains the polyethylene resin-containing particles in an amount of 0.2 to 2.0 wt%.

Further, in this case, it is preferable that the blocking values of the surfaces of the A layers are 200mN/70mm or less.

Further, in this case, it is preferable that the change amount of the haze after the surfaces of the a layers are attached to each other in a chemical vibration abrasion tester of the andean refiner mechanism and abraded 100 times under a load of 200g is 5% or less.

Further, in this case, it is preferable that the laminate contains: the polyethylene resin film described in any one of the above items, and a substrate film comprising the composition.

Further, in this case, it is preferable that the packaging bag includes the laminate.

ADVANTAGEOUS EFFECTS OF INVENTION

The present invention can provide: a polyethylene resin film which is excellent in appearance, heat sealability, stable blocking resistance and stable slidability, particularly excellent in scratch resistance. In addition, there may be provided: a laminate and a further package each using the polyethylene resin film.

Detailed Description

(layer A comprising a polyethylene resin composition)

The layer a in the present invention contains a polyethylene resin composition, but the polyethylene resin composition mainly contains a polyethylene resin and also contains particles containing a polyethylene resin. The polyethylene resin composition preferably contains the polyethylene resin in an amount of 50 wt% or more, more preferably 70 wt%, and still more preferably 90 wt% or more.

(polyethylene resin)

The polyethylene resin in the present invention is any of a homopolymer of an ethylene monomer, a copolymer of an ethylene monomer and an α -olefin, and a mixture thereof, and examples of the α -olefin include propylene, 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene, and 1-decene.

The density of the polyethylene resin is more preferably 900 to 935kg/m³More preferably 910 to 933kg/m³Particularly preferably 910 to 930kg/m³. The density is 935kg/m³The following polyethylene resin has a low heat sealing initiation temperature, is easy to form a bag, and has excellent transparency.

Further importantly, the inventors and others found that: the use density is 935kg/m³In the case of the following polyethylene resin, since the three-dimensional surface roughness SRa of at least one surface of the a layer is easily 0.05 μm or more and the maximum mountain height SRmax is 2 μm or more by including the polyethylene resin particles, the slidability, blocking resistance, and scratch resistance of the polyethylene resin film are easily obtained, and therefore, wrinkles and projections are not easily generated in coating processing, printing processing, and bag making processing, and the transparency is easily maintained. In particular, the blocking resistance was stable without being easily changed in each 2 measurement values of 4 measurements.

In addition, if used, the density is 900kg/m³The above polyethylene resin contains polyethylene resin particles, so that the three-dimensional surface roughness SRa of at least one surface of the a layer is easily controlled to 0.2 μm or less and the maximum mountain height SRmax is 15 μm or less, and transparency and stiffness are easily improved.

The blocking resistance was obtained by subjecting a sample obtained by stacking the surfaces of the A layers of the film to a pressure treatment in a hot press (model SA-303, manufactured by TESTER SANGYO) at a temperature of 50 ℃ and a pressure of 18MPa for 15 minutes in a size of 7cm × 7 cm. The sample and the rod (6 mm diameter material: aluminum) adhered by the pressure treatment were attached to an Autograph (model No. UA-3122, Shimadzu corporation) so that the rod and the release surface were horizontal, and when the rod was released from the adhered part at a speed of 200 m/minThe force of (2) was measured 4 times, and the average value was used as an index, but it was confirmed that the density of the used material was 935kg/m³In the case of the following polyethylene resin, the measured values obtained after 4 measurements are not likely to vary, and the heat seal initiation temperature is not likely to increase. The fluctuation of each measurement value measured 4 times is preferably at the same level as in the case of using inorganic particles.

The reason why the measurement value of each measurement sample is not likely to vary is presumed to be: the density is 935kg/m³When the following polyethylene is melt-mixed with the polyethylene resin-containing pellets, a decrease in the viscosity average molecular weight of the polyethylene resin-containing pellets, a change in the particle diameter due to entanglement with the molecular chains of the polyethylene resin other than the polyethylene resin-containing pellets, and the like are less likely to occur, and as a result, the protrusions on the formed surface become uniform.

The scratch resistance was determined by the change in haze after the polyethylene resin film was worn 100 times under a load of 200g by a chemical vibration abrasion tester equipped with a Antaha machine on the surfaces of the layers A. Haze was determined as follows: the haze of the center portion (mark points at both ends which do not affect the haze measurement and are located from the opposite surface of the friction surface at the point for end point) of the film (width × length is 50mm × 180mm) before being attached to the rubbing table was measured, and the haze at the same position was measured after rubbing to find the difference.

The polyethylene resin preferably has a melt flow rate (hereinafter sometimes referred to as MFR) of about 2.5 to 4.5 g/min from the viewpoint of film-forming properties. MFR is herein determined according to ASTM D1893-67. Alternatively, the polyethylene resin is synthesized by a method known per se.

In the case of using a resin having an MFR of 2.5g/10 min or less, since a decrease in the viscosity-average molecular weight of particles containing the polyethylene resin and a change in the particle diameter due to entanglement with molecular chains of the polyethylene resin other than the particles containing the polyethylene resin are less likely to occur, similarly to the description of the density, it is necessary to pay attention to the extrusion conditions. When a large-scale film forming machine is used for high-speed film formation, the MFR is particularly preferably about 3 to 4g/10 min for film forming properties.

The polyethylene resin has a melting point of preferably 85 ℃ or higher, more preferably 100 ℃ or higher, and particularly preferably 110 ℃ or higher, from the viewpoint of heat resistance and the like.

The polyethylene resin may be a single type, but 2 or more types of polyethylene resins having different densities within the above density range may be blended. When 2 or more polyethylene resins having different densities are blended, the average density and blending ratio can be estimated by GPC measurement and density measurement.

The density is 900 to 935kg/m³The polyethylene resin of (3) may be selected from the following, depending on the use thereof: a high-pressure low-density polyethylene (LDPE) which is transparent and has excellent flexibility, tear strength and tensile strength on average, a linear short-chain branched polyethylene (LLDPE) which is obtained by copolymerizing 1-butene/1-hexene-1-octene in a small amount and has a large number of short molecular chains in the molecular chain and excellent sealing properties and physical strength, and a metallocene catalyst linear short-chain branched polyethylene (LLDPE) which has a very sharp molecular weight distribution, is uniform in the distribution of comonomers and has excellent tear/tensile/puncture strength/pinhole resistance characteristics.

As the Polyethylene resin used in the sealing layer, commercially available products may be used, and examples thereof include Ube-Maruzen Polyethylene co., UMERIT (registered trademark) 2040FC manufactured by ltd, 0540F, 3540FC, Sumitomo Chemical co., sumikanene (registered trademark) E FV402, E FV405 manufactured by ltd.

(pellets comprising polyethylene resin)

The viscosity average molecular weight of the polyethylene resin-containing particles contained in the polyethylene resin composition constituting the layer a is preferably 150 ten thousand or more, more preferably 160 ten thousand or more, and further preferably 170 ten thousand or more. Further, it is preferably 250 ten thousand or less, more preferably 240 ten thousand or less, and further preferably 230 ten thousand or less.

When the viscosity average molecular weight of the polyethylene resin-containing particles is within this range, the average particle diameter of the polyethylene resin-containing particles can be controlled, and when the polyethylene resin is used in combination with a polyethylene resin having a specific density, the three-dimensional surface roughness SRa of at least one surface of the a layer can be set to 0.05 to 0.2 μm, and the maximum mountain height SRmax can be set to 2 to 15 μm.

The reason for this is presumed to be that since the difference in molecular weight between the polyethylene resin particles and the polyethylene resin other than the polyethylene resin particles is very large, in the film obtained by melt-mixing and extrusion without sufficient mixing of the molecules, the polyethylene resin particles are likely to maintain a nearly spherical shape, and aggregation due to fusion, adhesion, or the like of the particles is unlikely to occur, and therefore, protrusions with a controlled shape can be formed on the film surface.

When the viscosity average molecular weight of the polyethylene resin-containing particles is 150 ten thousand or more, the temperature at the time of melt-mixing with the polyethylene resin other than the polyethylene resin-containing particles is higher than the melting point peak of the polyethylene resin-containing particles, even under film-forming conditions of high shear and draw ratio by a large-sized extruder, decomposition by heat or shear or fusion and aggregation of the polyethylene resin-containing particles with each other, and changes in the particle diameter and shape of the polyethylene resin-containing particles caused by partial compatibility with the polyethylene resin other than the polyethylene resin-containing particles are less likely to occur, and therefore, it becomes easier to form projections whose shapes are controlled, such as inorganic particles and organic crosslinked resin particles, and not only functions as an antiblocking agent are sufficient, but also the film is less likely to have a sufficient appearance such as transparency, mechanical strength of the film, and the like, Or heat sealability.

Further, it has been unexpectedly found that particles containing a polyethylene resin having a viscosity average molecular weight of 150 ten thousand or more have a property of being less likely to aggregate in the polyethylene resin, but are less likely to fall off from the polyethylene resin in the vicinity of the film surface, which is a feature that inorganic particles and organic crosslinked resin particles do not have.

When the viscosity average molecular weight is 150 to 250 ten thousand, the average particle diameter is easily set to 5 to 20 μm, and when a film is formed by melt-mixing and extruding the sealing layer raw material, a suitable protrusion on the surface of the film tends to be easily formed.

Further, if the viscosity average molecular weight of the polyethylene resin-containing pellets is 150 ten thousand or more, the pellets themselves have lubricity, which is advantageous for improving blocking resistance and sliding properties, and the polyethylene resin-containing pellets are soft, and therefore, scratch resistance is also improved.

The resin hardness of the polyethylene resin-containing particles is preferably D70 or less. If the hardness is 70 or less, a layer in which the film is laminated, for example, a vapor deposition layer, is less likely to be defective, and the gas barrier property is less likely to be lowered. The hardness is more preferably D68 or less.

Further, if the hardness of the polyethylene resin-containing particles is D60 or more, the slidability is improved, and the slidability is not easily deteriorated even when heat is applied during film processing.

The particles containing the polyethylene resin are homopolymers of an ethylene monomer, copolymers of an ethylene monomer and an α -olefin, and mixtures thereof, and examples of the α -olefin include propylene, 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene, and 1-decene.

The density of the polyethylene resin-containing particles is preferably in the range of 930 to 950kg/m³More preferably 935 to 945kg/m³More preferably 937 to 942kg/m³. The density is less than 930kg/m³The pellets comprising the polyethylene resin of (1) are soft, and the shape of the pellets is not easily maintained during melt extrusion, and the blocking resistance is easily lowered. In addition, the density is more than 950kg/m³The pellets comprising the polyethylene resin of (3) are hard and not only are the scratch resistance easily lowered, but also the affinity with the polyethylene resin to be the base is lowered, and therefore, there is a possibility that the falling-off resistance is lowered.

The average particle diameter of the polyethylene resin-containing particles contained in the polyethylene resin composition constituting the layer a is preferably 5 μm or more, more preferably 6 μm or more, and still more preferably 7 μm or more. The average particle diameter is preferably 20 μm or less, more preferably 17 μm or less, and particularly preferably 15 μm or less.

Further, it is preferable that particles having a particle diameter of 30 μm or more are not contained. Even if the average particle diameter is 20 μm or less, when a predetermined amount of particles having a particle diameter of 30 μm or more is contained at 10% or more, the maximum peak height of the film surface easily exceeds 15 μm, and thus, if the film surface is visually observed, the flicker described later occurs.

Further, the particles having a particle size of 30 μm or more are not preferable in that they have an appearance similar to the gel-like defect and the quality thereof is deteriorated.

By setting the average particle diameter of the polyethylene resin-containing particles to 5 μm or more, the sliding property and blocking resistance can be improved.

Further, if the average particle size is 20 μm or less, the three-dimensional surface roughness SRa and the maximum protrusion height SRmax of at least one surface of the a layer are not excessively increased, and the number of protrusions is increased as compared with the case where the same weight of particles containing a polyethylene resin is added, and therefore, sufficient slidability, blocking resistance, and scratch resistance for film processing can be easily obtained.

The average particle diameter of the polyethylene resin-containing particles is less likely to change due to crushing and aggregation caused by kneading during extrusion, as compared with the softer inorganic particles such as talc and calcium carbonate, and the average particle diameter (before and after extrusion) is easily controlled such that the average particle diameter of the polyethylene resin-containing particles is in the range of 5 to 20 μm, so that the protrusions based on the coarse particles are substantially eliminated and the hardness of the protrusions itself is lower than that of the inorganic particles, whereby adverse effects on the coating layer provided on the other surface of the a layer or a layer other than the a layer are suppressed.

The content of the polyethylene resin-containing particles in the polyethylene resin composition constituting the a layer is preferably 0.2% by weight or more, more preferably 0.3% by weight or more, and still more preferably 0.4% by weight or more, based on the polyethylene resin composition. Further, it is preferably 2.0% by weight or less, more preferably 1.5% by weight or less, and further preferably 1.0% by weight or less. When the amount of the polyethylene resin-containing particles added is 0.2% by weight or more, the maximum mountain height of at least one surface of the layer A can be easily set to a predetermined area (0.2 mm)²) The thickness is 2 μm or more, and the blocking resistance and the sliding property can be easily obtained. Further, if the amount of the polyethylene resin-containing particles added is 2.0 wt% or less, the number of protrusions on the surface of the a layer is not excessively increased, and the transparency and the low-temperature sealing property are easily improved.

The polyethylene resin composition constituting the layer a contains an organic lubricant. The film has improved slidability and blocking resistance, and is excellent in handling properties. The reason for this is considered to be that the organic lubricant exudes and is present on the surface of the film, thereby exhibiting a lubricant effect and a mold release effect. Further, it is preferable to add an organic lubricant having a melting point of not less than room temperature.

Examples of the organic lubricant include fatty acid amides and fatty acid esters. Specifically, oleic acid amide, erucic acid amide, behenic acid amide, ethylene bis-oleic acid amide, hexamethylene bis-oleic acid amide, ethylene bis-stearic acid amide, and the like. These can be used alone, by using more than 2 kinds, even in severe environment can maintain the sliding properties, anti-adhesion effect, so optimization.

The lower limit of the content of the organic lubricant in the polyethylene resin composition constituting the layer a is preferably 0.16 wt% or more, preferably 0.18 wt%, more preferably 0.19 wt%, and particularly preferably 0.21 wt%. If the amount is 0.16% by weight or more, the sliding property is easily stabilized immediately after film formation. The upper limit is preferably 0.3% by weight, more preferably 0.25% by weight. If the amount is 0.3% by weight or less, excessive slipping does not occur, and whitening with time is not likely to occur.

When the layer a contains inorganic particles, the average particle diameter is preferably sufficiently smaller than the average particle diameter of particles containing the polyethylene resin. Preferably, the inorganic particles have an average particle diameter of 50% or less of the average particle diameter of the polyethylene resin particles and do not contain coarse particles having an average particle diameter of 2 times or more.

In the polyethylene resin composition constituting the layer a, the content of the inorganic particles is preferably 0.20% by weight or less, more preferably 0.10% by weight or less, still more preferably 0.05% by weight or less, and most preferably 0% by weight. By setting the content of the inorganic particles to 0.20 wt% or less, not only is the residue at the time of incineration reduced, but also effects similar to those in the case where only the particles containing the polyethylene resin are added, such as scratch resistance and no falling of the particles, can be easily obtained.

Even in the case of adding inorganic particles, if the particle size is as described above and the residue at the time of burning the film is 500ppm or less, the burned residue can be extremely reduced in the case of burning the film as compared with the conventional film containing inorganic particles.

The inorganic particles herein mean inorganic substances generally used as an antiblocking agent, such as silica, talc, calcium carbonate, diatomaceous earth, zeolite, and the like.

When the layer a contains crosslinked organic particles, the average particle diameter is preferably sufficiently smaller than the average particle diameter of particles containing a polyethylene resin. Preferably, the crosslinked organic particles have an average particle diameter that is 50% or less of the average particle diameter of the particles of the polyethylene resin and that is substantially free of coarse particles having an average particle diameter of 2 times or more.

From the viewpoint of suppressing the build-up of the mold and the cost, the content of the crosslinked organic particles in the polyethylene resin composition constituting the layer a is preferably equal to or less than the amount of the particles containing the polyethylene resin.

In the polyethylene resin composition constituting the layer a, as in the case of the inorganic particles, it is most preferable that the crosslinked organic particles are not contained in order to obtain the effect of adding the particles containing the polyethylene resin, such as scratch resistance and no falling of the particles.

The crosslinked organic particles herein mean organic crosslinked particles represented by polymethyl acrylate resins and the like.

(polyethylene resin composition)

The density of the polyethylene resin composition constituting the A layer is preferably 900 to 935kg/m³More preferably 910 to 933kg/m³More preferably 910 to 930kg/m³Particularly preferably 915-928 kg/m³Particularly preferably 915-925 kg/m³. Density less than 900kg/m³The blocking resistance of the polyethylene resin (2) is liable to be lowered.

The density is 935kg/m³The following polyethylene resin composition has a low heat sealing initiation temperature, is easy to form a bag, and has excellent transparency. Further importantly, the inventors and others found that: the use density is 940kg/m³In the case of the following polyethylene resin, the polyethylene resin is multilayeredThe film is easy to obtain stable blocking resistance or stable sliding property, and has excellent scratch resistance due to the synergistic effect of the organic lubricant contained in the polyethylene resin composition constituting the layer a and the surface protrusions generated by the polyethylene resin particles.

The polyethylene resin composition preferably has a melt flow rate (hereinafter sometimes referred to as MFR) of about 2.5 to 4.5 g/min from the viewpoint of film-forming properties. MFR is herein determined according to ASTM D1893-67.

(multilayer constitution)

The polyethylene resin film of the present invention may have a multilayer structure. In the case of a multilayer, other layers than the a layer may be provided in 1 layer or 2 or more layers.

As a specific method of such multilayering, a general multilayering apparatus (multilayer feed block, static mixer, multilayer manifold, etc.) can be used.

For example, the following methods can be used: thermoplastic resin feedblocks, static mixers, multi-manifold dies, and the like, which are fed from different flow paths by two or more extruders, are laminated into a plurality of layers. Alternatively, the multi-layering device may be introduced into the weld line from the extruder to the T-die using only one extruder.

In the case of the 3-layer structure, the other layers may be an intermediate layer (layer B) and a laminated layer (layer C), and may be included in this order. In this case, the outermost layers are a layer and a layer C, respectively.

Examples of the polyethylene resin used for the intermediate layer (layer B) and the laminate layer (layer C) include an ethylene/α -olefin copolymer and a mixture of 1 or 2 or more kinds selected from high-pressure polyethylene. The ethylene/alpha-olefin copolymer is a copolymer of ethylene and an alpha-olefin having 4 to 18 carbon atoms, and examples of the alpha-olefin include 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene, and 1-decene.

Films obtained from these polyethylene resins are excellent in heat seal strength, heat adhesiveness, impurity sealing properties, and impact resistance, and the polyethylene resins can be used by blending with other resins such as ethylene/vinyl acetate copolymers and ethylene/acrylic ester copolymers within a range not interfering with these properties.

In this case, the polyethylene resins used for the intermediate layer (layer B) and the laminated layer (layer C) may be the same or different. Further, although particles containing a polyethylene resin may be added or may not be added, if particles having a large particle diameter such as coarse particles are present in the laminate layer, delamination is likely to occur, and therefore, it is preferable not to add them.

In this case, the average density of the polyethylene resin composition constituting each layer of the film is preferably A layer. ltoreq. intermediate layer (B layer). ltoreq. laminated layer (C layer). The compounded organic lubricant is less likely to migrate to a layer having a high density, and therefore, is effective for maintaining the sliding property of the a layer after lamination or maintaining the lamination strength with time.

In this case, the lower limit of the density of the polyethylene resin composition constituting the intermediate layer (layer B) is preferably 900kg/m³More preferably 920kg/m³More preferably 930kg/m³. If the amount is less than the above range, the resulting sheet tends to have poor stiffness and be difficult to process.

The upper limit of the density of the intermediate layer (B layer) is preferably 960kg/m³More preferably 940kg/m³More preferably 935kg/m³。

The polyethylene resin composition constituting the intermediate layer (layer B) of the polyethylene resin film of the present invention may contain the organic lubricant, and the lower limit of the organic lubricant is preferably 100 ppm. If the amount is less than the above range, the slidability may be deteriorated.

The upper limit of the organic lubricant in the polyethylene resin composition constituting the intermediate layer is preferably 2000ppm, more preferably 1500 ppm. If the amount exceeds the above, excessive slip may cause winding displacement or whitening with time.

The intermediate layer (layer B) of the film of the present invention may be blended to such an extent that the quality of the recycled resin is not impaired.

In the present invention, the surface of the laminated layer (layer C) of the polyethylene resin film described above is preferably subjected to an active ray treatment such as corona treatment. The lamination strength is improved by this countermeasure.

When the polyethylene resin film of the present invention has 2 layers, the layer a may be a sealant layer and the other layers may be a laminate layer (layer C).

(three-dimensional surface roughness SRa)

The three-dimensional surface roughness SRa of the sealant layer of the polyethylene resin multilayer film of the present invention is preferably 0.05 μm or more. When SRa is 0.05 μm or more, the slidability and blocking resistance are excellent. SRa is more preferably 0.07 μm or more, particularly preferably 0.1 μm or more.

The three-dimensional surface roughness SRa of the sealant layer of the polyethylene resin multilayer film of the present invention is preferably 0.2 μm or less. When the SRa is 0.2 μm or less, the transparency is not easily lowered. SRa is more preferably 0.18 μm or less, particularly preferably 0.16 μm or less. The measurement method was performed by the method described in examples.

(maximum protrusion height SRmax)

The maximum protrusion height of at least one surface of the layer A of the polyethylene resin film of the present invention must be 2 to 15 μm. When the maximum protrusion height SRmax exceeds 15 μm, appearance defects occur, which is not preferable. The measurement method was performed by the method described in examples.

(Heat seal initiation temperature)

The upper limit of the heat seal initiation temperature of the polyethylene resin film in which the laminate of the biaxially stretched nylon film (15 μm) and the polyethylene resin film is laminated is preferably 140 ℃ and more preferably 130 ℃. If the amount exceeds the above range, the sealing process may be difficult.

(achieving Heat seal Strength)

The lower limit of the heat seal strength at 150 ℃ of the polyethylene resin film obtained by laminating a laminate of a biaxially stretched nylon film (15 μm) and a polyethylene resin film is preferably 30N/15mm, more preferably 35N/15 mm. If the amount is less than the above, the bag may be easily broken after the bag is produced.

The upper limit of the heat seal strength at 150 ℃ of the polyethylene resin film laminated with the laminate of the biaxially stretched nylon film (15 μm) and the polyethylene resin film is preferably substantially the same as the nylon rupture strength after lamination. The same as the nylon, indicating that the lamination strength was sufficiently high and the peel strength at the sealing interface was sufficiently high. The measurement method was performed by the method described in examples.

(blocking Strength)

The polyethylene resin film laminated with the laminate of the biaxially stretched nylon film (15 μm) and the polyethylene resin film preferably has a smaller blocking strength, more preferably 200mN/70mm or less, and still more preferably 150mN/70 mm. If the amount exceeds the above range, the powder-free property, the openability of the bag-made product, etc. cannot be sufficiently obtained. The measurement method was performed by the method described in examples.

(coefficient of friction)

The lower limit of the static friction coefficient of the polyethylene resin film obtained by laminating a laminate of a biaxially stretched nylon film (15 μm) and a polyethylene resin film is preferably 0.05, more preferably 0.08. If the amount is less than the above range, the film slips excessively during winding, which may cause winding displacement.

The upper limit of the static friction coefficient after lamination is preferably 0.70, more preferably 0.5. If the amount exceeds the above range, the opening property after bag making and the filling property of the contents are poor, and the loss during processing may increase.

The measurement method was performed by the method described in examples.

(haze)

The lower limit of the haze of the polyethylene resin film of the present invention is preferably 3%, more preferably 4%, and still more preferably 5%. If the amount is less than the above range, the anti-blocking agent may not be sufficiently present on the surface, which may cause blocking.

The upper limit of the haze is preferably 18%, more preferably 16%, and still more preferably 13%. If the content exceeds the above range, the content may not be easily visually recognized. The measurement method was performed by the method described in examples.

(sense of flicker)

The polyethylene resin film of the present invention preferably has substantially no glitter or has fine glitter but is uniform and unnoticeable. The measurement method was performed by the method described in examples.

In the conventional non-powder type having blocking resistance without applying powder such as starch to the film surface, inorganic particles having an average particle diameter of about 10 μm have been added in some cases, but when coarse particles are included in many cases, the glitter and transparency tend to be poor.

(scratch resistance)

The change in haze of a laminate comprising a biaxially stretched nylon film (15 μm) and a polyethylene resin film laminated thereon, after rubbing the polyethylene resin film surfaces so as to overlap each other, is also preferably 3% or less, more preferably 2% or less, still more preferably 1% or less, and particularly preferably 0.5% or less. The measurement method was performed by the method described in examples.

In the conventional so-called no-powder type having anti-blocking property without applying powder such as starch to the surface of the film, inorganic particles having an average particle diameter of about 10 μm have been added in some cases, but the inorganic particles are much harder than the polyethylene resin, and therefore, even if a sufficient amount of organic lubricant exists on the surface of the film, scratch resistance tends to be poor.

(Young's modulus)

The lower limit of the Young's Modulus (MD) of the polyethylene resin film of the present invention is preferably 60MPa, more preferably 70 MPa. If the amount is less than the above range, the hardness is too low, and the resulting composition may be difficult to process. The upper limit of the Young's Modulus (MD) is preferably 600MPa, more preferably 500 MPa.

The lower limit of the Young's modulus (TD) of the polyethylene resin film of the present invention is preferably 60MPa, more preferably 70 MPa. If the amount is less than the above range, the hardness is too low, and the resulting composition may be difficult to process. The upper limit of the Young's modulus (TD) is preferably 600MPa, more preferably 500 MPa.

(laminated body)

The polyethylene resin multilayer film of the present invention may be used as a packaging film or a packaging sheet in a laminate structure in which at least 1 other base film is further laminated on the film.

The base film is not particularly limited, and can be suitably selected and used according to the purpose of use of the laminate: polyolefin films such as polyethylene and polypropylene, films of styrene resins, films of polyesters such as polyethylene terephthalate and polybutylene terephthalate, films of polyamides such as nylon 6 and nylon 6, or stretched films thereof, laminated films of polyolefin films and polyamide films, resin films having gas barrier properties such as ethylene-vinyl alcohol copolymer films, and if necessary, metal foils such as aluminum, vapor-deposited films such as aluminum and silica, and paper. The base film may be used alone of 1 type, or may be used in combination of 2 or more types.

In this case, it is preferable to arrange the base films adjacent to each other on the laminate side of the polyethylene resin multilayer film.

As a method for laminating a polyethylene resin multilayer film on the base film, the following method can be adopted: the base film and the polyethylene resin multilayer film are dry-laminated. In this case, a polyethylene resin multilayer film, an adhesive layer, and another base film can be formed. When an anchor coating agent such as a urethane-based or isocyanate-based adhesive or a modified polyolefin such as an unsaturated carboxylic acid-grafted polyolefin is used as the adhesive resin for the adhesive layer, the adjacent layers can be firmly bonded.

The thickness of the laminate is not particularly limited, but is preferably 10 to 200 μm when the laminate is used as a film such as a lid material, and is preferably 200 to 1000 μm when the laminate is used as a sheet for a cup or a tray.

(packaging body)

The container can be produced by facing the sealing layer surfaces of the sealant films of the laminate with each other or facing the sealing layer surface of the sealant film layer of the laminate with another base film, and then heat-sealing at least a part of the periphery of the laminate from the laminate side so as to have a desired container shape. And the entire periphery is heat-sealed, whereby a sealed pouch container can be manufactured. When the molding process of the pouch container is combined with the filling process of the contents, the contents are filled after the bottom and side portions of the pouch container are heat-sealed, and then the upper portion is heat-sealed, whereby a package can be manufactured. Therefore, the laminate can be used for an automatic packaging device for solid, powder, or liquid materials such as snacks.

Further, a container in which the content is packaged may be obtained by filling the container formed into a cup shape by vacuum forming or pressure forming, a container obtained by injection molding or blow molding, a container formed of a paper base material, or the like with the content, and then covering the container with the laminate of the present invention as a lid material and heat-sealing the lid material.

Examples

The present invention will be described in further detail below with reference to examples and comparative examples, but the present invention is not particularly limited by the following examples. The measurement values of the respective items in the detailed description and examples of the present invention are measured by the following methods.

Hereinafter, embodiments of the present invention will be described in detail.

(1) Method for measuring particles containing polyethylene resin

Pellets containing a polyethylene resin were measured for each physical property of the raw material resin before processing.

Even after the film is formed, the particles containing the polyethylene resin can be separated and measured by a method such as completely dissolving the particles in decane and then separating the high molecular weight portion by GPC.

(2) Viscosity average molecular weight of polyethylene resin-containing particles

Measured according to ASTM-D4020.

(3) Average particle diameter of polyethylene resin-containing particles

The average particle diameter of the pellets formed from the polyethylene resin before use was measured as follows.

The particles were dispersed in ion-exchanged water stirred at a predetermined rotation speed (about 5000rpm) using a high-speed stirrer, the dispersion was added to isotonicity (physiological saline), further dispersed in an ultrasonic disperser, and the particle size distribution was determined by the coulter counter method and calculated as the average particle size.

(4) Particle size distribution of particles comprising polyethylene-based resin

The ratio of particles having a particle diameter of 30 μm or more among the particles formed of the polyethylene resin before use was calculated from the particle size distribution obtained by the Coulter counting method.

(5) Melting Point of particles comprising polyethylene resin

The melting point of the pellets formed from the polyethylene resin before use was determined as follows: the measurement was carried out by a Differential Scanning Calorimeter (DSC), manufactured by SII, at a sample amount of 10mg and a temperature increase rate of 10 ℃ per minute. The melting endothermic peak temperature detected here was taken as the melting point.

(6) Density, MFR, melting point of polyethylene resin other than polyethylene resin particles

The raw materials before film formation were measured by the following methods.

The polyethylene resin forming the layer containing particles of the polyethylene resin can be measured in the same manner as in the case of removing the solvent from the filtered solution obtained in (1) above by confirming the entire layer by an electron microscope if the polyethylene resin is a single layer or the layer configuration by an electron microscope if the polyethylene resin is a laminate and then cutting the surface by a thickness lower than the surface layer. When the laminate is cut out, the laminate may be laminated on a PET film or the like, and then the surface layer may be cut out with a razor or the like.

(Density)

Measured according to the density gradient tube method in accordance with JIS-K7112.

(melt flow Rate: MFR) (g/10 min)

Measured at a temperature of 190 ℃ in accordance with JIS-K7210.

(melting Point)

The measurement was carried out by a Differential Scanning Calorimeter (DSC), manufactured by SII, at a sample amount of 10mg and a temperature increase rate of 10 ℃ per minute. The melting endothermic peak temperature detected here was taken as the melting point.

(7) Content of inorganic particles in the resin composition (% by weight)

The content of the inorganic particles in the resin composition is calculated from the amount added in the raw material resin composition before processing.

Even after the film is formed, the film is dissolved at a temperature at which the film is completely dissolved using decane as a solvent, and the inorganic particles are separated and measured by a method such as filtering the residue with a filter having a filtering accuracy of 1 to 2 μm.

(8) Amount of residue (ppm) after film incineration

The film was measured on a precision balance at about 30g to the 1 st position after the decimal point (rounding off the 2 nd position). The crucible was previously air-baked at 700 ℃ for 1 hour to 100 ℃ or less, and then air-dried in a glass drier until the temperature reached room temperature, and the weight of the crucible was measured. Then, the film was placed in a crucible, and burned in an electric furnace at 700 ℃ for 2 hours, the heater was removed, the temperature was lowered to about 100 ℃, and the film was transferred to a glass drier, air-dried for 30 minutes until the temperature became room temperature, and the weight difference between the crucible before and after burning was divided by the weight of the film to calculate the amount of residue.

(9) Filter booster (film making processability)

The resin composition used in the seal layer of comparative example 1 was discharged at a discharge rate of 1 kg/hr to a filter area of 81 pi square mm in a sintered nalon filter having a filter accuracy of 120 μm for 5 hours at a resin temperature of 230 ℃ using a Trauton tester, and the pressure rise (Δ MPa) at that time was defined as "x", "o", "Δ", and "x", respectively.

Very good: the amount of pressure increase is 5% or less of the amount at the start of extrusion.

O: the amount of pressure increase is 10% or less of the amount at the start of extrusion.

And (delta): the amount of pressure increase is 15% or less of the amount at the start of extrusion.

X: the amount of pressure increase is 20% or less of the amount at the start of extrusion.

(10) Die lip contaminant (film forming processability)

The resin composition used for the seal layer was extruded at a discharge rate of 20 kg/hr through a strand die (5 mm. phi., 2 holes) in an extruder at 230 ℃ for 5 hours, and the contamination of the die lip at that time was visually observed and classified as "excellent", "good", "delta", and "x" as follows.

Very good: die lip contamination was substantially undetectable.

O: die lip contamination was slightly visible.

And (delta): die lip contamination can be clearly identified.

X: die lip contamination grows and strip-like depressions are created in the strand.

(11) Three-dimensional surface roughness SRa

According to JIS B0601-1994, 100 pieces of a film sheet having a thickness of 1 mm. times.0.2 mm were measured at a low-zone cut λ s of 0.08mm, a length of 1000 μm and a pitch of 2 μm on an arbitrary measurement surface of the film sheet having a thickness of 3 cm. times.3 cm by using a contact surface roughness (model ET4000A manufactured by Xiaoban Ltd.).

From the obtained cross-sectional curve, the three-dimensional surface roughness SRa of the surface of the seal layer of the polyethylene resin multilayer film was calculated by using the three-dimensional surface roughness analysis program TDA-22 in accordance with JIS B0601-1994.

In the above method, the average value of the three-dimensional surface roughness SRx is determined by measuring n to 3.

(12) Maximum protrusion height SRmax

From the obtained cross-sectional curve, the maximum protrusion height SRmax was calculated in accordance with JIS B0601-1994 using the three-dimensional surface roughness analysis program TDA-22.

In the above method, the average value of the maximum protrusion height SRmax is obtained by measuring n to 3.

(13) Heat-sealing initiation temperature (. degree.C.)

On the corona surface of a nylon film (Toyo biaxially stretched nylon film: N1100, 15 μm), an adhesive for dry lamination (TM569, CAT-10L) made by Toyo-Morton, Ltd. was applied so that the solid content became 3g/m²After the solvent was evaporated and removed in an oven at 80 ℃, the corona side of the polyethylene resin film and the coated side of the adhesive were sandwiched and laminated on a temperature-controlled roll at 60 ℃. The laminated film was aged at 40 ℃ for 2 days. The prepared laminated sample was heat-sealed at a sealing pressure of 0.1MPa, a sealing time of 0.5 seconds, and a sealing temperature of 90-160 ℃ at a 10-mm width interval. The heat-sealed sample was cut into a strip shape so that the heat-sealing width became 15mm, and mounted on an Autograph (plant type)Type number by Shimadzu corporation: UA-3122), the maximum value of the strength at which the sealing surface is peeled at a rate of 200 mm/min is measured at n number 3, and the heat seal strength and the heat seal temperature at each temperature are plotted. The heat-seal temperature at 4.9N/15mm was read from the graph obtained by connecting plots with straight lines and was used as the heat-seal initiation temperature.

(14) Achieving the heat sealing strength (N/15mm)

On the corona surface of a nylon film (Toyo biaxially stretched nylon film: N1100, 15 μm), an adhesive for dry lamination (TM569, CAT-10L) made by Toyo-Morton, Ltd. was applied so that the solid content became 3g/m²After the solvent was evaporated and removed in an oven at 80 ℃, the corona side of the polyethylene resin film and the coated side of the adhesive were sandwiched and laminated on a temperature-controlled roll at 60 ℃. The laminated film was aged at 40 ℃ for 2 days. The prepared laminated sample was heat-sealed at a sealing pressure of 0.1MPa, a sealing time of 0.5 seconds, and a sealing temperature of 120 to 190 ℃ at a 10-mm width interval. The heat-sealed sample was cut into a strip shape so that the heat-sealing width became 15mm, and the strip-shaped sample was mounted on an Autograph (model No. UA-3122, Shimadzu corporation), and the maximum value of the strength of peeling the seal surface at a speed of 200 mm/min was measured at an n-number of 3, and the heat-sealing strength having the highest average value was defined as the seal strength.

(15) Adhesive Strength (mN/70mm)

A laminated film with a nylon film (Toyo spun biaxially stretched nylon film: N1100, 15 μm) was prepared as follows.

On the corona surface of the nylon film, an adhesive (TM569, CAT-10L) for dry lamination, made by Toyo-Morton, Ltd, was applied so that the solid content became 3g/m²After the solvent was evaporated and removed in an oven at 80 ℃, the corona side of the polyethylene resin film and the coated side of the adhesive were sandwiched and laminated on a temperature-controlled roll at 60 ℃. The laminated film was aged at 40 ℃ for 2 days.

A sample (10 cm. times.15 cm) having surfaces of the A layers overlapped with each other was placed on one end of an aluminum plate (2mm thick) having a size of 7 cm. times.7 cm at a position of 1cm inside in the longitudinal direction (15cm) at the center of the sample width (10cm) in a hot press (model: SA-303), and pressure treatment was performed at a temperature of 50 ℃ and a gauge pressure of 18MPa for 15 minutes.

The sample and the rod (material having a diameter of 6 mm: aluminum) stuck by the pressure treatment were attached to an Autograph (model No. UA-3122, Shimadzu corporation), and the force at which the rod was peeled off from the stuck portion at a speed of 200 m/min was measured.

In this case, it is assumed that the bar and the release surface are horizontal. For the same sample, 4 measurements were made, expressed as an average value.

(16) Coefficient of static friction

On the corona surface of the nylon film, an adhesive (TM569, CAT-10L) for dry lamination, made by Toyo-Morton, Ltd, was applied so that the solid content became 3g/m²After the solvent was evaporated and removed in an oven at 80 ℃, the corona side of the polyethylene resin film and the coated side of the adhesive were sandwiched and laminated on a temperature-controlled roll at 60 ℃. The laminated film was aged at 40 ℃ for 2 days. The coefficient of static friction between the polyethylene resin film surfaces of the resulting laminated film was measured at 23 ℃ under 65% RH atmosphere in accordance with JIS-K-7125.

(17) Haze degree

Only the polyethylene resin film was measured in accordance with JIS-K-7105 using a direct-reading haze meter manufactured by Toyo Seiki Seisaku-Sho.

Haze (%) - [ Td (diffusive transmittance%)/Tt (total transmittance%) ] × 100

(18) Sense of flicker

Only the polyethylene resin film was visually observed, and the glittering sensation was classified into "very excellent", "Δ", "x".

Very good: the bright spots are not substantially perceived.

O: there are fine bright spots, but uniform and not of particular concern.

And (delta): partially with bright spots, feeling a foreign body sensation.

X: the transparency is impaired by the bright spots on the entire surface.

(19) Scratch resistance (mechanical evaluation)

The scratch resistance was evaluated by the change in haze after 40 times of rubbing under a load of 200g using a chemical vibrometer (a friction tester II type flat friction material 20 × 20mm test piece base flat sliding arc length of 100mm) in which the sealing surfaces of the films were mounted on a andean refiner so that the surfaces to which the polyethylene resin particles were added were opposed to each other. Haze was determined as follows: the haze of the film (width × length 30mm × 180mm, for a flat friction material, 50 × 50mm) before being attached to the friction table was measured at the center portion for the friction table, and the haze was measured at the same position before and after the friction to find the difference.

(20) Scratch resistance (visual evaluation)

On the corona surface of the nylon film, an adhesive (TM569, CAT-10L) for dry lamination, made by Toyo-Morton, Ltd, was applied so that the solid content became 3g/m²After the solvent was evaporated and removed in an oven at 80 ℃, the corona side of the polyethylene resin film and the coated side of the adhesive were sandwiched and laminated on a temperature-controlled roll at 60 ℃. The laminated film was aged at 40 ℃ for 2 days. The resulting laminate film was pinched and rubbed 10 times with fingers so that the polyethylene resin film surfaces thereof were overlapped with each other, and the scratch-off easiness was classified into "excellent", "Δ", and "x" as follows by visual observation.

Very good: substantially without scratches.

O: with fine streaky scratches but without whitening.

And (delta): a fine, striped, dense and partially whitened pattern was visible.

X: the rubbed area is substantially whitened.

Next, the present invention will be described in further detail with reference to examples and comparative examples, but the present invention is not limited to the following examples.

In examples and comparative examples, the following raw materials were used.

(polyethylene resin)

(1) Ube-Maruzen Polyethylene Co., UEREIT (registered trademark) 0540F manufactured by Ltd (Ube-Maruzen Polyethylene Co., Ltd.) (Metallocene linear low-density polyethylene having a density of 904kg/m³MFR4.0g/10 min, mp 111 ℃ C.)

(2) SUMIKATHENE (registered trademark) E FV402 (metallocene catalyst LLDPE, density: 913kg/m, manufactured by Sumitomo Chemical Co., Ltd.)³MFR: 3.8g/10 min, melting point: 115 ℃ C.)

(3) SUMIKATHENE (registered trademark) E FV405 (metallocene catalyst LLDPE, density: 923kg/m, manufactured by Sumitomo Chemical Co., Ltd., product name³MFR: 3.8g/10 min, melting point: 118 deg.C)

(4) SUMIKATHENE (registered trademark) E FV407 (metallocene catalyst LLDPE, density: 930kg/m, manufactured by Sumitomo Chemical Co., Ltd., (registered trademark)³MFR: 3.2g/10 min, melting point: 124 deg.C)

(5) Ube-Maruzen Polyethylene Co., Ltd, UMERIT (registered trademark) 3540FC (metallocene catalyst LLDPE, density: 931 kg/m)³MFR: 3.6g/10 min, melting point: 123 ℃ C.)

(6) Ube-Maruzen Polyethylene Co., Ltd, UMERIT (registered trademark) 4540F (metallocene catalyst LLDPE, density: 944 kg/m)³MFR: 4.0g/10 min, melting point: 128 degree C)

(pellets comprising polyethylene resin)

(1) MIPELON PM200 (average particle diameter 10 μm, melting point 136 ℃, density 940kg/m, manufactured by Mitsui Chemicals, Inc.)³0% of particles having a viscosity-average molecular weight of 180 ten thousand and a particle diameter of more than 30 μm, a resin hardness D65, and ultra-high molecular weight polyethylene particles

(2) MIPELON XM221U (average particle size 25 μm, melting point 136, density 940kg/m manufactured by Mitsui Chemicals, Inc.)³25% of particles having a viscosity-average molecular weight of 200 ten thousand and a particle diameter of more than 30 μm, a resin hardness D65, and ultrahigh-molecular-weight polyethylene particles

(inorganic particles)

(1) Inc., manufactured by Dicalite WF (diatomaceous earth, used by processing into an average particle size of 5 μm with a pin mill)

(2) Shin-Etsu Silicon Co., Ltd., KMP-130-10 (spherical silica particles, average particle diameter 10 μm) was used at 15% MB based on FV402 made by Sumitomo Chemical Co., Ltd.

(Master batch)

(1) MIPELON PM200 was mixed with SUMIKATHENE (registered trademark) E FV405 manufactured by Sumitomo Chemical co., ltd. to prepare a master batch (1) containing MIPELON PM 20015 wt%.

(2) MIPELON XM221U was mixed with Sumitomo Chemical co., ltd. product sumikanene (registered trademark) E FV405 to prepare a master batch (2) containing MIPELON XM221U 15 wt%.

(3) A master batch (3) containing 20 wt% of grifco.inc., product, Dicalite WF was prepared by mixing grefco.inc., product, sumikanene (registered trademark) E FV405 with Sumitomo Chemical co., ltd.

(4) Shin-Etsu Silicon Co., Ltd., KMP-130-10 was mixed with SUMIKATHENE (registered trademark) E FV405 manufactured by Sumitomo Chemical Co., Ltd., and a master batch (4) containing 1015 wt% of Shin-Etsu Silicon Co., Ltd., KMP-130-F was prepared.

(5) Erucamide was mixed with Sumitomo Chemical co., ltd. product sumikanene (registered trademark) E FV402 to prepare a master batch (5) containing 4 wt% of erucamide.

(6) Ethylene bis-oleamide was mixed with Sumitomo Chemical co., ltd. product sumikanene (registered trademark) E FV402 to prepare a master batch (6) containing 2 wt% of ethylene bis-oleamide.

(example 1)

[ composition for sealing layer ]

A composition was prepared by mixing Ube-Maruzen Polyethylene co., umeritt (registered trademark) 0540F, Ltd, 86.25 wt%, 4 wt% for masterbatch (1), 1.25 wt% for masterbatch (5), and 8.5 wt% for masterbatch (6) to obtain a composition, and using the composition thus obtained, a composition for a sealant layer was prepared.

[ composition for laminated layer ]

FV402 was produced only by Sumitomo Chemical co., ltd. to produce a laminate layer composition.

[ composition for intermediate layer ]

A composition was obtained by mixing 99.4 wt% of Sumitomo Chemical co., ltd. FV402, 0.5 wt% of the master batch (5), and 0.1 wt% of the master batch (6) to prepare a composition for an intermediate layer.

Using an extruder having a T-die, in such a manner as to be in the order of the composition for the laminate layer, the composition for the intermediate layer, and the composition for the sealing layer, and in such a manner that the thickness ratio of the laminate layer, the intermediate layer, and the sealing layer becomes 8: 34: manner 8, the composition for a laminate layer, the composition for an intermediate layer, and the composition for a sealing layer were melt-extruded at 240 ℃. After that, the surface of the laminate was subjected to corona discharge treatment. Then, the film was wound on a roll at a speed of 150 m/min to obtain a polyethylene resin multilayer film having a thickness of 50 μm and a wet tension of the treated surface of 45 mN/m.

(example 2)

In the sealant layer, Sumitomo Chemical co., ltd. product SUMIKATHENE (registered trademark) E FV 40286 wt%, masterbatch (1)4 wt%, masterbatch (5)1.50 wt%, and masterbatch (6)8.5 wt% were mixed,

a polyethylene resin multilayer film and a vapor-deposited film were obtained in the same manner as in example 1, except that the laminated layer was changed to sumikanene (registered trademark) E FV405 manufactured by Sumitomo Chemical co.

(example 3)

A polyethylene resin multilayer film and a vapor-deposited film were obtained in the same manner as in example 1 except that Sumitomo Chemical co., ltd. product sumikanene (registered trademark) E FV 40587.75 wt%, master batch (1)4 wt%, master batch (5)1.25 wt%, and master batch (6)7 wt% were mixed in the sealant layer, and Sumitomo Chemical co., ltd. product sumikanene (registered trademark) E FV402 was changed to Sumitomo Chemical co., ltd. product sumikanene (registered trademark) E FV405, and only Sumitomo Chemical co., ltd. product sumikanene (registered trademark) E FV407 was changed in the intermediate layer.

(example 4)

A polyethylene resin multilayer film and a vapor-deposited film were obtained in the same manner as in example 1 except that Sumitomo Chemical co., ltd. product sumikanene (registered trademark) E FV 40584.75 wt%, master batch (1)8 wt%, master batch (5)1.25 wt%, and master batch (6)6 wt% were mixed in the sealant layer, and Sumitomo Chemical co., ltd. product sumikanene (registered trademark) E FV402 was changed to Sumitomo Chemical co., ltd. product sumikanene (registered trademark) E FV405, and only Sumitomo Chemical co., ltd. product sumikanene (registered trademark) E FV407 was changed in the intermediate layer.

(example 5)

In the sealing layer, Ube-Maruzen Polyethylene Co., Ltd., UMERIT (registered trademark) 3540F 86.75 wt%, masterbatch (1)4 wt%, masterbatch (5)1.75 wt%, and masterbatch (6)7.5 wt% were mixed,

in the intermediate layer, SUMIKATHENE (registered trademark) E FV402 manufactured by Sumitomo Chemical Co., Ltd., Ube-Maruzen Polyethylene Co., Ltd., UMERIT (registered trademark) 3540F manufactured by Ltd,

a Polyethylene resin multilayer film and a vapor-deposited film were obtained in the same manner as in example 1, except that the laminated layer was changed to Ube-Maruzen Polyethylene co.

(example 6)

A polyethylene resin multilayer film and a vapor-deposited film were obtained in the same manner as in example 1, except that Sumitomo Chemical co., ltd. product sumikanene (registered trademark) E FV 40586.75 wt%, master batch (1)4 wt%, master batch (3)0.5 wt%, master batch (5)1.25 wt%, and master batch (6)7.5 wt% were mixed in the sealant layer, and Sumitomo Chemical co., ltd. product sumikanene (registered trademark) E FV402 was changed to Sumitomo Chemical co., ltd. product sumikanene (registered trademark) E FV405, and only Sumitomo Chemical co., ltd. product sumikanene (registered trademark) E FV407 was changed in the intermediate layer.

(example 7)

A polyethylene resin multilayer film and a vapor-deposited film were obtained in the same manner as in example 1 except that Sumitomo Chemical co., ltd. product sumikanene (registered trademark) E FV 40587.25 wt%, master batch (1)4 wt%, master batch (5)1.25 wt%, and master batch (6)7.5 wt% were mixed in the sealant layer, Sumitomo Chemical co., ltd. product sumikanene (registered trademark) E FV402 was changed to Sumitomo Chemical co., ltd. product sumikanene (registered trademark) E FV405, and only Sumitomo Chemical co., ltd. product sumikanene (registered trademark) E FV407 was changed in the intermediate layer.

The polyethylene resin films obtained in examples 1 to 7 were excellent in scratch resistance, low-temperature heat sealability, blocking resistance, slidability, and appearance because they did not substantially contain inorganic particles having a larger particle diameter than particles containing a polyethylene resin.

Moreover, the film has very little residue in film incineration, and is excellent in film-forming processability such as almost no accumulation and filter pressure rise.

Comparative example 1

In the sealant layer, Sumitomo Chemical co., ltd. sumikanene (registered trademark) E FV 40582.25 wt%, masterbatch (3)2.5 wt%, masterbatch (4)8 wt%, masterbatch (5)1.25 wt%, and masterbatch (6)6 wt% were mixed. A polyethylene resin multilayer film and a vapor-deposited film were obtained in the same manner as in example 1 except that Sumitomo Chemical co., ltd. product sumikanene (registered trademark) E FV402 was changed to Sumitomo Chemical co., ltd. product sumikanene (registered trademark) E FV405, and only Sumitomo Chemical co., ltd. product sumikanene (registered trademark) E FV405 was changed to laminated layers in the intermediate layers.

The film obtained in comparative example 1 was excellent in blocking resistance and slidability, but was slightly glittery, had a large amount of inorganic residues after incineration, was particularly poor in scratch resistance, and also had slightly poor film-forming processability.

Comparative example 2

A polyethylene resin multilayer film and a vapor-deposited film were obtained in the same manner as in example 1 except that Sumitomo Chemical co., ltd. product sumikanene (registered trademark) E FV 40590.25 wt%, master batch (3)2.5 wt%, master batch (5)1.25 wt%, and master batch (6)6 wt% were mixed in the sealant layer, Sumitomo Chemical co., ltd. product sumikanene (registered trademark) E FV402 was changed to Sumitomo Chemical co., ltd. product sumikanene (registered trademark) E FV405, and only Sumitomo Chemical co., ltd. product sumikanene (registered trademark) E FV405 was changed in the intermediate layer.

The film obtained in comparative example 2 had less residue and excellent glitter, but was inferior in blocking resistance, scratch resistance and slidability.

Comparative example 3

A polyethylene resin multilayer film and a vapor-deposited film were obtained in the same manner as in example 1, except that Sumitomo Chemical co., ltd. product sumikanene (registered trademark) E FV 40587.75 wt%, master batch (1)1 wt%, master batch (3)2.5 wt%, master batch (5)1.25 wt%, and master batch (6)7.5 wt% were mixed in the sealant layer, and Sumitomo Chemical co., ltd. product sumikanene (registered trademark) E FV402 was changed to Sumitomo Chemical co., and sumitome (registered trademark) E FV405 was changed to ltd. product Sumitomo Chemical co., and sumitome (registered trademark) E FV405 was changed to ltd.

The film obtained in comparative example 3 had a small amount of residue and slightly excellent scratch resistance, but had a small number of protrusions and poor blocking resistance.

Comparative example 4

In the sealing layer, Ube-Maruzen Polyethylene Co., Ltd., UMERIT (registered trademark) 4540F 87.25 wt%, masterbatch (1)4 wt%, masterbatch (5)1.25 wt%, and masterbatch (6)7.5 wt% were mixed,

in the intermediate layer, SUMIKATHENE (registered trademark) E FV402 manufactured by Sumitomo Chemical Co., Ltd. was changed to Ube-Maruzen Polyethylene Co., Ltd. UMERIT (registered trademark) 4540F manufactured by Ltd,

The film obtained in comparative example 4 had less residue and was excellent in scratch resistance, but the resin density was high, which caused unstable surface protrusions of polyethylene pellets, and the blocking resistance and the sliding property were insufficient and had large variations.

Comparative example 5

A polyethylene resin multilayer film and a vapor-deposited film were obtained in the same manner as in example 1 except that Sumitomo Chemical co., ltd. product sumikanene (registered trademark) E FV 40587.25 wt%, master batch (2)4 wt%, master batch (5)1.25 wt%, and master batch (6)7.5 wt% were mixed in the sealant layer, Sumitomo Chemical co., ltd. product sumikanene (registered trademark) E FV402 was changed to Sumitomo Chemical co., ltd. product sumikanene (registered trademark) E FV405, and only Sumitomo Chemical co., ltd. product sumikanene (registered trademark) E FV407 was changed in the intermediate layer.

The film obtained in comparative example 5 had a small amount of residue and excellent scratch resistance, but even when the amount of the addition was large, the protrusion density was low because of the large particle diameter, and the blocking resistance and the glittering feeling were poor.

Comparative example 6

A Polyethylene resin multilayer film and a vapor-deposited film were obtained in the same manner as in example 1 except that a composition was obtained by mixing together, in the seal layer, Ube-Maruzen Polyethylene co., Ltd system umeritt (registered trademark) 0540F of 86.25 wt%, masterbatch (1) of 4 wt%, masterbatch (5) of 1.25 wt%, and masterbatch (6) of 5.0 wt%, and a composition for the seal layer was prepared using the obtained composition.

Comparative example 7

A polyethylene resin multilayer film and a vapor-deposited film were obtained in the same manner as in example 2, except that a composition was obtained by mixing Sumitomo Chemical co., ltd. product SUMIKATHENE (registered trademark) E FV 40295.90 wt%, masterbatch (1)4 wt%, masterbatch (5)1.25 wt%, and masterbatch (6)5.0 wt% in the sealant layer, and a composition for the sealant layer was prepared using the composition obtained.

The results are shown in tables 1 and 2.

[ Table 1]

[ Table 2]

The polyethylene resin film of the present invention has been described above based on some examples, but the present invention is not limited to the configurations described in the above examples, and the configurations described in the respective examples can be appropriately combined and changed without departing from the gist thereof.

Industrial applicability

The polyethylene resin film according to the present invention is excellent in properties, and therefore can be suitably used for a wide range of applications such as food packaging.

Claims

1. A polyethylene resin film having at least an A layer comprising a polyethylene resin composition, wherein the polyethylene resin composition constituting the A layer satisfies the following 1) to 3), and at least one surface of the A layer satisfies the following 4) and 5),

1) comprising a density of 900kg/m³Above and 935kg/m³The following polyethylene-based resin is used,

2) comprising a particle comprising a polyethylene-based resin,

3) the content of the organic-based lubricant is 0.16 wt% or more,

4) the three-dimensional surface roughness SRa is 0.05 to 0.2 μm,

5) the maximum mountain height SRmax is 2-15 μm.

2. A polyethylene resin film comprising at least one layer A comprising a polyethylene resin composition, wherein the polyethylene resin composition constituting the layer A satisfies the following 1) to 3), and at least one surface of the layer A satisfies the following 4) and 5),

1) the density is 900kg/m³Above and 935kg/m³In the following, the following description is given,

2) comprising a particle comprising a polyethylene-based resin,

3) the content of the organic-based lubricant is 0.16 wt% or more,

4) the three-dimensional surface roughness SRa is 0.05 to 0.2 μm,

5) the maximum mountain height SRmax is 2-15 μm.

3. The polyethylene resin multilayer film according to claim 1 or 2, wherein the resin hardness of the polyethylene resin-containing particles is D70 or less.

4. The polyethylene resin film according to any one of claims 1 to 3, wherein the polyethylene resin-containing particles have a viscosity average molecular weight of 150 ten thousand or more.

5. The polyethylene resin film according to any one of claims 1 to 4, wherein the polyethylene resin particles have an average particle diameter of 5 to 15 μm.

6. The polyethylene resin film according to any one of claims 1 to 5, wherein the content of the polyethylene resin particles in the polyethylene resin composition constituting the A layer is 0.2 to 2.0% by mass.

7. The polyethylene resin film according to any one of claims 1 to 6, wherein the surface layers of the A layer have a blocking value of 200mN/70mm or less.

8. The polyethylene resin film according to any one of claims 1 to 7, wherein the change in haze after the layer surface A layers are mounted on each other in a chemical vibration abrasion tester of Antaha's refiner and abraded 100 times under a load of 200g is 3% or less.

9. A laminate, comprising: the polyethylene resin film according to any one of claims 1 to 8, and a base film comprising the thermoplastic resin composition.

10. A packaging bag comprising the laminate of claim 9.