JPH1177924A - Lamination film for twist packaging - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make after-twist restoration small, and make shape-retainability good after being twisted once into a shape by laminating a surface layer consisting of an ethylene copolymer on both the surfaces of a base material layer consisting of a composition blended in a specific quantity with cyclic olefinic resin and polyethylene resin, and specifying the thickness of the base material layer. SOLUTION: A twist packaging lamination film is formed by laminating a surface layer B consisting of an ethylene copolymer on the both the surface of a base material layer A consisting of a composition blended with 40-90 wt.% cyclic olefin resin and 10-60 wt.% polyethylene resin. In this instance, the base material layer A should have the thickness TA in the range of 30-80% of the total thickness TO. The respective thicknesses TB, TB of a surface layer B can usually be in the range of 1-30 μm; preferably, be in 5-15 μm, and the three layer structural twist packaging lamination film of the surface later B/base material layer A/surface layer B can usually be in the range of 20-60 μm in its total thickness TO, preferably in the range of 25-40 μm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated film for twist packaging, which has a twist property suitable for twist packaging, and is excellent in film strength, cutability, slipperiness, and antistatic property.

[0002]

TECHNICAL BACKGROUND OF THE INVENTION Twisted packaging for packaging food etc. individually
It is a friendly and beautiful packaging form, has a voluminous feel, and has been used for a long time. Such twist packaging has various forms such as double twist, horizontal twist, and vertical twist. For such twisted packaging,
Conventionally, cellophane has been used. Cellophane used in such twisted packaging is transparent and has excellent torsion characteristics such that the package can be maintained after being twisted, and is a very suitable material for twisted packaging. However, cellophane is a film mainly composed of regenerated cellulose, and is inferior in moisture resistance by itself. Therefore, usually, a laminated chlorinated resin film such as vinylidene chloride having good moisture resistance is used. For this reason, it has been pointed out that harmful substances may be generated when the twisted packaging film made of cellophane is incinerated, and it is necessary to develop a new twisted packaging material. In addition, cellophane is a film mainly composed of regenerated cellulose, and its production process requires excessive energy. Therefore, it is necessary to develop a new twisted packaging material in consideration of environmental conservation and increase in production cost. I have.

Under such demands, the use of non-plasticized vinyl chloride, polypropylene, polyethylene, uniaxially stretched high-density polyethylene and the like as a twisted packaging material has been studied. Its suitability for twist packaging is extremely poor. That is, in the twist packaging, after the food or the like is wrapped and the end portion is twisted, the twisted packaging must be maintained. In order to maintain such a twisted packaged state, it is necessary to use a hard film to some extent.However, if a hard film is used to twist and package angular chocolate, for example, the film will be torn at the corners of the food and efficiently. Unable to do twist packaging.

Under these circumstances, cellophane is still used as a twist packaging material even though various material films have been proposed to be used as the twist packaging material as described above.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a packaging material which can replace cellophane as a twist packaging material.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a cyclic olefin resin
A surface layer (B) made of an ethylene (co) polymer is laminated on both sides of a base layer (A) made of a composition in which 90% by weight and 10 to 60% by weight of a polyethylene resin are blended, The thickness (T _A ) of the base material layer (A) is 30 times the total thickness (T ₀ ).
In the laminated film for twist packaging, which is in the range of ８０80%.

The laminated film for twist packaging according to the present invention comprises, as a base layer (A), a cyclic olefin resin containing a predetermined amount of a polyethylene resin, and an ethylene-based (co) weight on the surface of the base layer (A). 3 in which the surface layer (B) made of united is laminated
It has a layered structure. The cyclic olefin-based resin film is a resin film that is strong and has good torsion properties, but cannot be used for twisting packaging with this resin alone because it is hard and brittle. The laminate of the present invention comprises a resin composition in which a predetermined amount of a polyethylene resin is blended with the cyclic olefin resin as a base layer, and an ethylene-based (co)
The laminated film of the present invention, which is a laminated body obtained by laminating polymer films, has such a configuration, and is very similar to cellophane in both twisting packaging characteristics, appearance, and feel. Moreover,
Since the laminate of the present invention does not contain chlorine, no harmful components are generated even when incinerated.

[0008]

DETAILED DESCRIPTION OF THE INVENTION Next, the laminate for twisted packaging according to the present invention will be specifically described. As shown in FIG. 1, the laminated film for twist packaging according to the present invention includes a base layer (A) and a surface layer (B) laminated on both sides of the base layer (A).

In the laminated film of the present invention, the base layer (A) comprises a cyclic olefin resin and a polyethylene resin. The cyclic olefin-based resin forming the substrate layer (A) of the laminated film of the present invention is a random copolymer of ethylene and a cyclic olefin represented by the formula [I] or [II] (cyclic olefin random copolymer). ), Formula [I] or [I
The ring-opened polymer or copolymer of the cyclic olefin represented by the formula (I) is a hydrogenated product of the ring-opened (co) polymer of the cyclic olefin represented by the formula [I] or [II], or And copolymer modified products of (co) polymers.

[0010] Among the cyclic olefin resins used in the present invention, the ethylene / cyclic olefin random copolymer is a copolymer of ethylene and a cyclic olefin represented by the following formula [I] or [II], preferably ethylene. / Cyclic olefin (molar ratio) is a copolymer obtained by copolymerization at a ratio of 20 to 95/80 to 5.

[0011]

Embedded image

In the above formula [I], n is 0 or 1,
m is 0 or a positive integer, q is 0 or 1,
R¹~ R¹⁸And R^aAnd R^bAre each independently water
Substituted with an element atom, halogen atom or halogen
Is a good hydrocarbon group; ^Fifteen~ R¹⁸Are connected to each other
May form a single ring or multiple rings, and
May have a double bond in the polycyclic ring;^FifteenAnd R¹⁶
With or R¹⁷And R ¹⁸Form an alkylidene group with
May be.

[0013]

Embedded image

In the above formula [II], p and q are 0 or a positive integer, m and n are 0, 1 or 2;
¹ to R ¹⁹ each independently represent a hydrogen atom, a halogen atom, an optionally substituted hydrocarbon group or an alkoxy group with a halogen, the carbon atom to which R ⁹ or R ^{1 0} is attached, R ¹³ is a bond And the carbon atom to which R ¹¹ is bonded may be bonded directly or via an alkylene group having 1 to 3 carbon atoms. When n = m = 0, R ¹⁵ and R ¹² Alternatively, R ¹⁵ and R ¹⁹ may combine with each other to form a monocyclic or polycyclic aromatic ring.

[0015] Cyclic olefins that can be used in the present invention
Examples of cyclic olefins that form vinyl resins include
Cyclo [2.2.1] hept-2-ene derivative, tetracyclo [4.
4.0.1 ^2,5.1^7,10] -3-dodecene derivative, hexacyclo [6.
6.1.1^3,6.1^10,13.2^2,7.0^9,14] -3-Heptadecene derivative,
Octacyclo [8.8.0.1^2,9.1^4,7.1^11,18.1^13,16.0^3,8.0^1
2,17] -5-docosene derivative and the like. This
Such as cyclic olefins alone or in combination
Can be used.

The cyclic olefin as described above is randomly copolymerized with ethylene to form a cyclic olefin-based random copolymer. Such a cyclic olefin-based random copolymer, in addition to cyclic olefin and ethylene, propylene, 1-butene, 4-methyl-1-pentene, 1-hexene, 1- octadecene and 1-eicosene carbon number such as 3-20 α-olefins; cyclopentene,
Cyclohexene, 3a, 5,6,7a-tetrahydro-4,7-methano-
Copolymerization of cycloolefins such as 1H-indene, non-conjugated dienes such as 1,4-hexadiene, 4-methyl-4-hexadiene and 5-vinyl-2-norbornene; norbornenes such as norbornene-2 and 5-chloronorbornene It may be.

In the present invention, as the cyclic olefin-based resin, a ring-opened (co) polymer of the above-mentioned cyclic olefin can also be used. Further, as the cyclic olefin-based resin, a hydrogenated product of the above-mentioned cyclic olefin ring-opening (co) polymer can also be used. Further, in the present invention, as the cyclic olefin resin,
A cyclic olefin random copolymer, a cyclic olefin ring-opening (co) polymer or a hydrogenated product of a cyclic olefin ring-opening (co) polymer as described above is used, for example, with maleic anhydride, maleic acid, itaconic anhydride, itacone A graft product modified with a modifying agent such as an acid, an unsaturated carboxylic acid such as (meth) acrylic acid, or an anhydride thereof can also be used.
These modifiers can be used alone or in combination.

These cyclic olefin resins can be used alone or in combination of two or more. Incidentally, such a cyclic olefin resin is disclosed in JP-A-60-16870.
No. 8, No. 61-120816, No. 61-115912, No. 61-115916,
It can be produced according to the methods described in JP-A Nos. 61-271308, 61-272216, 62-252406 and 62-252407.

In the cyclic olefin-based resin layer, an ultraviolet absorber, a heat stabilizer, a weather stabilizer, a light stabilizer, an antistatic agent, a slip agent, an antiblocking agent, Clouding agents, nucleating agents, lubricants, dyes and pigments that absorb only light of a specific wavelength, natural oils, synthetic oils,
Additives such as waxes or translucent fillers may be included.

The intrinsic viscosity [μ] of such a cyclic olefin resin measured in decalin at 135 ° C. is as follows:
Usually within the range of 0.01 to 20 dl / g, preferably 0.05.
It is in the range of 10 to 10 dl / g. The crystallinity of these cyclic olefin-based resins measured using X-rays is as follows:
It is usually less than 5%, often 0%.

The softening temperature (TMA) of the above-mentioned cyclic olefin resin as measured by a thermal mechanical analyzer is usually 60 ° C. or higher, preferably 7 ° C.
0 ° C. or higher, and the glass transition point (Tg) is usually 30
° C or higher, preferably 60 ° C or higher, more preferably 70 ° C or higher.
２３０230 ° C.

The melt flow rate (MFR: AS) of this cyclic olefin resin measured at 260 ° C.
TM D 1238) is usually 1 to 100 g / 10 minutes,
Preferably it is 5 to 50 g / 10 minutes.

The substrate layer (A) forming the laminated film of the present invention is formed from a resin composition comprising the above-mentioned cyclic olefin resin and a polyethylene resin. In the present invention, any of high-density polyethylene, medium-density polyethylene, and low-density polyethylene can be used as the polyethylene-based resin forming the base layer (A). In the present invention, high density polyethylene or linear low density polyethylene is preferably used as the polyethylene resin which is mixed with the cyclic olefin resin to form the base material layer (A). The polyethylene resin used here may be a homopolymer of ethylene, or a copolymer of ethylene and an α-olefin having 3 or more carbon atoms. This polyethylene resin is
When it is a copolymer, the copolymerization amount of the α-olefin is usually 5 mol% or less, preferably 3 mol% or less.

Further, in the present invention, the high-density polyethylene forming the substrate layer usually has a density of 0.94.
0 to 0.970 g / cm ³ , preferably 0.950 to 0.960
g / cm ³ , and the melt index at 190 ° C. is usually from 0.02 to 20 g / 10 min, preferably 0.1.
Those within the range of 10 to 10 g / 10 minutes are used. Also,
As a linear low-density polyethylene, the density is usually 0.8.
70 to 0.945 g / cm ³ , preferably 0.920 to 0.94
0 g / cm ^{3 and} a melt index at 190 ° C. of usually 0.1 to 30 g / 10 min, preferably 0.5.
〜１０10 g / 10 min) are used.

Since the resin composition forming the base material layer (A) contains a polyethylene resin in addition to the cyclic olefin resin, the base material layer (A) may be broken at the time of twist packaging, Cracks and the like hardly occur.

In such a polyethylene resin, the resin composition forming the base material layer (A) comprises 40 to 90% by weight of the cyclic olefin resin and 10 to 60% of the polyethylene resin.
%, Preferably 60 to 80% by weight of the cyclic olefin resin and 20 to 40% by weight of the polyethylene resin.

The thickness (T _A ) of the base layer (A) comprising such a cyclic olefin resin and a polyethylene resin is usually 10 to 50 μm, preferably 15 to 30 μm. In the laminated film for twist packaging according to the present invention, a surface layer (B) made of an ethylene-based (co) polymer is laminated on both sides of the above-described base material layer (A). The layer composed of the cyclic olefin-based resin and the polyethylene-based resin alone exhibits the twist-wrapping property, that is, the property that the twisted form is maintained as it is when the twist-wrapping is performed. However, the rigidity is not sufficient, and for example, when twisting and packaging angular foods, the film may be torn at the corners. Furthermore, a film containing a cyclic olefin-based resin as a main component is not so high in solvent resistance, so that printing on the surface of a packaging material is restricted. In addition, since a film containing a cyclic olefin resin as a main component tends to have a low expression effect even when a slip agent and an antistatic agent are stably compounded, such a film containing a cyclic olefin resin as a main component is used. Even if an attempt is made to actually perform twist-wrapping using a film containing a cyclic olefin-based resin as a main component, such a film becomes difficult to flow in the packaging device.

In the present invention, when the above-mentioned film containing a cyclic olefin resin as a main component is used for twist packaging, the base material layer (A) containing the cyclic olefin resin as a main component has ethylene-based resin on both sides. By laminating the surface layer (B) made of a (co) polymer, a property comparable to cellophane is obtained as a twist packaging film.

Here, the resin forming the surface layer (B) is:
It is an ethylene-based (co) polymer, and a homopolymer of ethylene or a copolymer of ethylene and an α-olefin having 3 or more carbon atoms can be used. 870~0.945g / cm ^3, preferably in the range of 0.900~0.940g / cm ^3, 190 ℃
Melt index is usually 0.1 to 30 g / 10
Ethylene (co) polymers in the range of 0.5 to 10 g / 10 minutes are preferably used. Further, among these ethylene (co) polymers, the density is 0.87.
0 to 0.945 g / cm ³ , preferably 0.920 to 0.940
g / cm ³ , and the melt index at 190 ° C. is 0.1 to 30 g / 10 minutes, preferably 0.5 to 10 g / cm ^3.
Linear low density polyethylene (LLDP) within 10 minutes
Particular preference is given to using E). The surface layer (B) formed of such an ethylene (co) polymer is formed on both surfaces of the base material layer (A), but the surface layers (B) formed on both surfaces are formed of the same resin. Although it is not particularly necessary to form the film, when the resin forming the surface layer is different, the film often curls. Therefore, in the present invention, the surface layer (B) is formed of the same resin. Is preferred.

In the ethylene (co) polymer forming the surface layer (B), a slip agent and an antistatic agent, and if necessary, an antiblocking agent and an ultraviolet absorber,
Heat stabilizer, weather stabilizer, light stabilizer, antifogging agent, nucleating agent,
It is preferable to add a lubricant, a dye that absorbs only light of a specific wavelength, a pigment, an additive such as a natural oil, a synthetic oil, a wax, or a translucent filler. Such an additive can be uniformly and stably compounded in the surface layer (B) made of an ethylene (co) polymer. Such additives are usually incorporated in the ethylene (co) polymer in an amount of 10% by weight or less, preferably 7% by weight or less. When twisting and wrapping food or the like using the packaging film of the present invention, the film of the present invention can be prepared by blending the above-mentioned additive into an ethylene (co) polymer forming the surface layer (B). Supply to the packaging device can be stably continued.

Examples of slip agents that can be used in the present invention include higher fatty acid amides such as erucamide and oleic acid amide, and higher fatty acid bisamides such as ethylenebisoleic amide and ethylenebiserucamide. be able to. Examples of the antistatic agent include glycerin higher fatty acid mono- or diester, diglycerin higher fatty acid mono- or diester, and the like.

As an additive to such an ethylene (co) polymer, a slip agent, an antistatic agent, an anti-blocking agent and the like are mixed and marketed. In the present invention, such a mixture is used alone or in combination. Can also be used. Examples of such a mixture include Masterbatch AZ-20M for Ultzex (manufactured by Mitsui Petrochemical Industry Co., Ltd.) and antistatic agent masterbatch liquemaster MPE-6 (manufactured by Riken Vitamin Co., Ltd.). it can.

In the laminated film for twist packaging according to the present invention, the thickness (T _B , T _B ) of the surface layer ( _B ) is usually in the range of 1 to 30 μm, preferably 5 to 15 μm. The total thickness (T ₀ ) of the laminated film for twist packaging of the present invention having a three-layer structure of surface layer (B) / base layer (A) / surface layer (B) is usually 20 to 60 μm, Preferably it is in the range of 25 to 40 μm. In the total thickness (T ₀ ) of the laminated film for twist packaging of the present invention (100%)
The thickness (T _A ) occupied by the base material layer ( _A ) is usually 30 to 8
0%, preferably 50 to 70%, more preferably 50 to 60%. Therefore, the thickness (T _B , T _B ) occupied by each surface layer ( _B ) is usually 20 to 70%. ,
Preferably 30-50%, more preferably 40-50
%. If the ratio of the thickness (T _A ) occupied by the base material layer (A) in the laminated film of the present invention deviates from the above range, the thickness (T _B , T B) necessarily occupied by the surface layer (B) _B )
May become small, and strength comparable to cellophane may not be obtained. If the ratio of the thickness (T _A ) occupied by the base material layer (A) in the laminated film deviates from the above range, the thickness (T _B , T _B ) occupied by the surface layer (B) is inevitably reduced. )
Is increased, the twisting wrapping property is reduced, and the twisted state at the time of twisting wrapping may not be maintained.

The thickness (T _B , T _B ) of the two surface layers (B) formed on the front and back surfaces of the base material layer (A) in the present invention, respectively.
T _B ) are preferably substantially the same. If the thickness of the surface layer (B) is different, the laminated film tends to curl.

Further, the laminated film of the present invention has a
Preferably, the film has a stress at break in the machine direction and transverse direction of not less than 20 MPa, and an elongation at break of not less than 10%, measured according to the method specified in K-6782, and a stress at break of not less than 25 MPa. It is particularly preferred that the elongation at break is 40% or more.

A laminated film having such a stress at break is unlikely to cause tearing or breaking of the film during twist packaging. Further, since the laminated film of the present invention is for twist packaging, it is preferable that the bending angle measured as follows is smaller than a predetermined value. That is, a test piece of 5 cm x 5 cm was cut out from the laminated film,
The film is folded in two, a load of 4 kg is placed on the entire surface of the film and left for 30 seconds. Then, the load is removed and the film is left for 60 seconds. Although the film folded in 60 seconds tends to return, the laminated film of the present invention is:
Since it is for twist packaging, it is necessary to have the property that the shape once formed is retained, and as described above, the bending angle of the film after 60 seconds has passed is 60 °.
The angle is preferably less than 50 degrees, more preferably 50 degrees or less, particularly preferably 40 degrees or less.

By forming the layer of the film of the present invention so that the angle of the film once folded under a load is less than 60 degrees, preferably 50 degrees or less, particularly preferably 40 degrees or less, cellophane is obtained. Twist packaging performance equivalent to that of. By the way, if you measure the angle of cellophane normally used for twisted packaging in the same way, it is 60
The cellophane angle is less than 50 degrees, which is particularly suitable for twist packaging, and the preferred angle is less than 40 degrees.

The laminated film of the present invention having the above-mentioned structure is very similar to cellophane in terms of appearance, touch, twist packaging property, mechanical properties, etc., and has been widely used as a conventional twist packaging material. Can be used in the same way as cellophane. In addition, since the moisture resistance is much higher than cellophane alone, there is no need to apply a polyvinylidene chloride coating or the like on the surface unlike conventional cellophane for twisted packaging. Never do. Further, the laminated film of the present invention can be supplied at a lower cost than conventionally used cellophane for twist packaging.

The laminated film for twist packaging of the present invention can be manufactured by various methods. For example, the surface layer (B)
It can be manufactured by adopting a method such as a co-extrusion T-die method, a co-extrusion inflation method, a film laminating method or the like so as to have a layer structure of / base layer (A) / surface layer (B). Here, in the case of manufacturing by film lamination, the film forming the surface layer (B) and the base material layer (A)
Can be laminated via an adhesive. In the case of manufacturing by sandwich extrusion coating, a film for forming the surface layer (B) is manufactured in advance, and a film for forming the surface layer (B) is laminated while extruding the base material layer (A). can do. Among these methods, the co-extrusion T-die method and the co-extrusion inflation method are preferable.

The laminated film for twist packaging of the present invention as described above can be used as a vertical twist packaging material or a horizontal twist packaging material for confectionery such as candy and chocolate which has conventionally been twist-wrapped using cellophane. it can. Furthermore, since the mechanical properties are excellent, the packaging speed is 300 to
High-speed twist packaging such as 1200 pieces / minute can be handled.

[0041]

According to the present invention, a laminated film for twist packaging having a twist packaging property equal to or higher than that of cellophane is provided.

That is, the laminated film for twist packaging of the present invention comprises: a base layer (A) using a cyclic olefin resin;
Ethylene (co) laminated on both sides of this base material layer (A)
Since it is composed of the surface layer (B) made of a polymer, the return after twisting is small, and once it is twisted and shaped, the form is maintained as it is. In addition, the laminated film of the present invention has high strength, and is unlikely to be broken or perforated during twist packaging. In addition, this film is strong,
Since the film has good slipperiness and antistatic properties, it can be smoothly fed into the apparatus during automatic packaging using this film.

Further, since the outermost layer of the laminated film of the present invention is made of an ethylene (co) polymer, it has good solvent resistance to the solvent contained in the ink used for printing. Also, it has good transparency and good printability like cellophane.

Since the laminated film for twist packaging has excellent moisture proof properties by itself, it is not necessary to form a polyvinylidene chloride coat layer or the like for moisture proof unlike cellophane. The film contains substantially no halogen such as chlorine. For this reason, even if this laminated film is incinerated, halide,
Dioxin and the like are not generated. Further, the film of the present invention can be supplied at low cost.

As described above, the laminated film of the present invention can be twist-wrapped in the same manner as cellophane, instead of cellophane which is a packaging material for twist packaging which could not be substituted in spite of various proposals. Film.

[0046]

EXAMPLES Next, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.

The methods of forming and measuring and evaluating the properties of the films used in the examples and comparative examples of the present invention are as follows. Film forming method The consolidation method is a multi-manifold three-type three-layer T-die (die opening width 1450 mm) and an extruder (screw diameter 7
Using a T-die cast molding machine consisting of 5 mm, 75 mm, and 75 mm), while setting the resin temperature in the T-die portion to 230 ° C. and laminating each extruded resin, the surface layer (B)
A three-layer film having a layer structure of / base layer (A) / surface layer (B) was extruded, immediately wound around a cooling roll at 30 ° C., solidified by cooling, and taken up at a take-up speed of 40 m / min. The film was wound up into a roll. Immediately before winding, one side of the film was subjected to corona treatment so that printing could be performed.

Film Evaluation Method and Processing Conditions (1) Suitability of Twist Processing A twist packaging machine (manufactured by Tench Machine Co., Ltd., vertical twist packaging machine) was used to evaluate the twist packaging workability of the manufactured laminated film. Evaluation criteria and processing conditions are as follows. <Evaluation Criteria> (1-1) Twistability "O": Twisting is complete, the twisted portion has little return, there is no protrusion of the packaged object from the packaging film, and the film breaks or perforates during twisting. There is no. "△": The return after twisting is large and incomplete. “×”: Twistability is poor, the object to be packaged jumps out of the packaging film, or the film is broken during processing, and twist packaging is not possible. (1-2) Film feedability “○”: No film clogging or deviation during the automatic film transport process. “×”: A state in which film clogging and displacement occur during the automatic film transport process. <Processing conditions> Film width: 96 mm, twist angle: 900 ° (2.5 rotations), packaging speed: 180 pieces / min. (2) Folding angle The evaluation film cut into a square having a side of 5 cm is folded in two, and a load of 4 kg is immediately placed on the folded film for 30 seconds. Thereafter, the load is removed, and the angle of the bent portion after 60 seconds is measured with a protractor. (3) Stress at break / elongation at break Measured in accordance with JIS K6782 method. (4) Impact Resistance Using a film impact tester (manufactured by Toyo Seiki Co., Ltd., 1-inch ball at the tip), the impact resistance was evaluated based on the film breakthrough strength. (5) Slipperiness The slipperiness of the film was determined by the magnitude of the angle (tan θ) at the beginning of sliding (tan θ) according to the sliding inclination method between the outer surfaces of the film. (6) Anti-static surface resistance measuring machine (RE34 manufactured by Advantest Corporation)
OA), the static resistance was evaluated based on the surface resistance of the film. The measurement atmosphere is 23 ° C. and 50% Rh. (7) Tear strength The tear strength was measured by the Elmendorf method (JIS P8116). (8) Transparency The haze value was measured according to JIS K6714 method.

[0049]

Example 1 According to the above-mentioned film forming method and film physical property evaluation method, a laminated film was formed and each evaluation was performed.

Table 1 shows the results. Hereinafter, types of resins and film configurations in Examples of the present invention will be described. Base layer (A) forming resin: Cyclic olefin-based resin (Ac) (Ac-1) Commercially available ethylene-cyclic olefin random copolymer, MFR (at 260 ° C): 40 g / 10 minutes, glass transition temperature: 80 ° C polyethylene Resin (Ap) (Ap-1) A commercially available linear low-density polyethylene resin, MFR (at 190 ° C.): 2.1 g / 10 min, density: 0.94
0 g / cm ³ mixing ratio: (Ac-1) 80% by weight (Ap-1) 20% by weight Surface layer (B) forming resin: Linear low density polyethylene resin (Bp) (Bp-1) Commercial linear low Density polyethylene resin, MFR (at 190 ° C): 2.1 g / 10 minutes, density: 0.94
0 g / cm ³ Additive to surface layer forming resin (Ba) (Ba-1) Commercial slip, anti-blocking masterbatch (Ba-2) Commercial antistatic agent masterbatch Mixing ratio: (Bp-1) 95 weight %, (Ba-1) 2% by weight, (Ba-2) 3% by weight Film composition:

[0051]

Example 2 Evaluation was performed in the same manner and under the same conditions as in Example 1 except that the film composition ratio was changed as follows.

Table 1 shows the results. Film composition:

[0053]

Example 3 Evaluation was carried out by the same method and conditions as in Example 1 except that the blending amount of the polyethylene resin (Ap-1) for forming the base material layer (A) was changed to 30% by weight. .

Table 1 shows the results.

[0055]

Example 4 Evaluation was performed in the same manner and under the same conditions as in Example 2 except that the amount of the polyethylene resin (Ap-1) forming the base material layer (A) was changed to 30% by weight.

Table 1 shows the results.

[0057]

Example 5 The linear low-density polyethylene resin (Bp) forming the surface layer (B) was changed to the following brand (Bp-2), and the polyethylene resin (A) forming the base layer (A) was changed.
Evaluation was performed in the same manner and under the same conditions as in Example 1 except that p) was changed to the following brand (Ap-2). Linear low density polyethylene resin (Bp) (Bp-2) Commercially available linear low density polyethylene resin, MFR (at190
° C): 2.1 g / 10 min, Density: 0.920 g / cm ³ Polyethylene resin (Ap) (Ap-2) Commercial linear low density polyethylene resin, MFR (at 190
° C): 2.1 g / 10 min, Density: 0.920 g / cm ^{3 The} results are shown in Table 1.

[0058]

Example 6 Evaluation was performed in the same manner and under the same conditions as in Example 5 except that the film composition ratio was changed as follows.

Table 1 shows the results. Film composition:

[0060]

Comparative Example 1 Evaluation was carried out in the same manner and under the same conditions as in Example 1 except that the amount of the polyethylene resin (Ap) forming the base material layer (A) was changed to 0% by weight.

Table 1 shows the results.

[0062]

Comparative Example 2 Evaluation was performed in the same manner and under the same conditions as in Example 2 except that the amount of the polyethylene resin (Ap) forming the base material layer (A) was changed to 0% by weight. Table 1 shows the results
Shown in

[0063]

Comparative Example 3 Evaluation was performed in the same manner and under the same conditions as in Comparative Example 1 except that the film composition ratio was changed as follows.

Table 1 shows the results. Film composition:

[0065]

Reference Example 1 Surface (B) layer resin additive (Ba) (B)
Evaluations were performed in the same manner and under the same conditions as in Example 1 except that the amounts of a-1) and (Ba-2) added were 0% by weight.

[0066]

Comparative Example 4 Evaluation was performed under the same conditions as in Example 1 except that the kind of resin of the surface (B) layer and the film constitution were changed as follows. Resin for forming surface layer (B): (Bp-3) Commercially available MFR (at 230 ° C.): 5.5 kg / 10 min, density:
0.910 g / cm ³ additive (Ba) (Ba-2) Commercial slip, anti-blocking masterbatch Compounding ratio: (Bp-3) 95% by weight, (Ba-2) 5% by weight Film composition: Table 1 shows the results.

[0067]

Comparative Example 5 A uniaxially stretched polyethylene film (25 μm thickness) was used as a film, and the physical properties of the film were evaluated in the same manner as in Example 1.

Table 1 shows the results.

Table 1 shows the results.

[0070]

[Table 1]

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing a cross section of a laminated film for twist packaging according to the present invention.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI C08L 23/04 C08L 23/04 65/00 65/00

Claims (7)

[Claims] 1. A cyclic olefin resin in an amount of 40 to 90% by weight.
And 10 to 60% by weight of polyethylene resin
Ethylene-based material on both sides of the base material layer (A) comprising the composition
A surface layer (B) made of a (co) polymer is laminated, and a substrate layer
(A) thickness (T _A) Is the total thickness (T₀30-80% of the
Laminated film for twist packaging in the range. 2. The cyclic olefin-based resin constituting the base material layer (A) is a random copolymer of ethylene and a cyclic olefin, a cyclic olefin ring-opening (co) polymer, a cyclic olefin ring-opening (co) polymer. Hydrides and their (co)
At least one resin selected from the group consisting of graft-modified polymers, wherein the polyethylene resin has a density of 0.940 to 0.970 g / cm ³ and a melt index at 190 ° C. of 0.02 to 20 g / cm ³ . High density polyethylene in the range of 10 minutes or a density of 0.87-0.945
g / cm ³ , melt index at 190 ° C. is 0.1
The laminated film for twist packaging according to claim 1, wherein the laminated film is a linear low-density polyethylene in a range of ３０30 g / min. 3. The density of the polyethylene (co) polymer constituting the surface layer (B) is in the range of 0.87 to 0.945 g / cm ^{3 and} the melt index at 190 ° C. is 0.1 to 20 g. The laminated film for twist packaging according to claim 1, wherein the thickness is within / 10 minutes. 4. The laminated film for twist packaging according to claim 1, wherein a slip agent and an antistatic agent are blended with the polyethylene (co) polymer forming the surface layer (B). 5. The thickness (T ₀ ) of the laminated film for twist packaging comprising the substrate layer (A) and the surface layer (B) laminated on both surfaces of the substrate layer (A) is 20 to 20. The laminated film for twist packaging according to claim 1, wherein the thickness is within a range of 60 µm. 6. The laminated film according to JIS-K
The stress at break in both the machine direction and the transverse direction of the film measured according to the method specified in -6782 is 20 MPa.
The laminated film for twist packaging according to claim 1 or 2, wherein the elongation at break is 10% or more. 7. The laminated film is 5 cm × 5 cm.
Is folded in two, a load of 4 kg is placed on the film for 30 seconds, the load is removed, and the film is left for 60 seconds.
The angle is less than 0 °.
The laminated film for twist packaging according to any one of the above.