JP2002275323A - Film for stretch label - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film for stretch labels which maintains self-stretchability at a high level and has a high stiffness, excellent bottle-fitting properties, and a high tightening power. SOLUTION: This film contains (A) an ethylene/α-olefin copolymer component which has a melt flow rate in a fixed range, a density in a specified range, a variation coefficient of composition distribution in a specified range, and a specified relation between the density and the wt. ratio of cold-xylene solubles, is prepared from ethylene and an α-olefin having the number of carbon atoms in a fixed range, and is contained in a wt.ratio in a fixed range and (B) a high-pressure polyethylene component which has a density in a specified range and a wt.ratio in a fixed range. The film may further contain (C) another ethylene/α-olefin copolymer component having a density in a specified range or a high-density polyethylene component having a density in a specified range. A multilayer film for stretch labels having at least one layer of the above film is also provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stretch label film, and more particularly, to a stretch label in which self-stretchability is maintained at a high level, rigidity is high, bottle mounting is excellent, and fastening force is high. It relates to a film for use.

[0002]

2. Description of the Related Art In recent years, the demand for plastic bottles that are excellent in moldability, easy to handle, and lightweight has been increasing dramatically.
The demand for stretch labels is also increasing.

Conventionally, a film made of an ethylene-vinyl acetate copolymer has been used for a stretch label because of its good self-shrinkability. However, ethylene-
Films made of vinyl acetate copolymer lack mechanical strength such as tensile strength and tear strength, so they are easily damaged when mounted on a container, and bottles are filled with contents at high temperatures, In the case of heat sterilization after filling, there is a problem that wrinkles are generated due to deformation and adhesion to a bottle is reduced due to insufficient heat resistance. Furthermore, since the film made of the ethylene-vinyl acetate copolymer lacks the rigidity required at the time of mounting, it has problems such as deformation, buckling, and generation of wrinkles at the time of mounting. In order to solve the above-mentioned problems in the film made of the ethylene-vinyl acetate copolymer, an ethylene / α-olefin copolymer has been used instead of the ethylene-vinyl acetate copolymer.

For example, Japanese Patent Application Laid-Open No. 9-297539 discloses a single-site metallocene catalyst which has improved mechanical strength, heat resistance, scratch resistance to hardly scratch the surface, oil resistance and excellent printing effect. A stretch label film containing a composition having a ratio of linear low-density polyethylene to LDPE of 60/40, which is polymerized by using the method, is described. As such, further improvement was required.

Japanese Patent Application Laid-Open No. 9-330029 discloses that mechanical strength, heat resistance, scratch resistance and oil resistance, which are hard to be scratched on the surface, are improved, chemical resistance, printing effect, expansion and contraction, and adhesion. A stretch label film containing a composition in which the ratio of linear low-density polyethylene and medium-density polyethylene polymerized using a single-site metallocene catalyst having an excellent property is 60/40 is described. Further improvement has been required as a balance between the rigidity of the film and the self-stretchability required at the time of mounting.

[0006] Japanese Patent Application Laid-Open No. Hei 10-207373 discloses that mechanical strength, heat resistance, scratch resistance and oil resistance, which do not easily damage the surface, are improved, and surface gloss, hardness, chemical properties, and printing effects are excellent. Further, an outer layer, an intermediate layer composed of linear low-density polyethylene polymerized using a single-site metallocene catalyst, and a stretch label film composed of an inner layer are described. It is described that LDPE can be added to linear low-density polyethylene polymerized using a site-based metallocene catalyst, but further improvement is required for the balance between film rigidity and self-stretching required at the time of mounting. Had been.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a stretch label film which maintains a high level of self-stretchability, has high rigidity, has excellent bottle mountability, and has a high fastening force.

[0008]

Means for Solving the Problems In view of such circumstances, the present inventors have conducted intensive studies and found that the melt flow rate is within a certain range, the density is within a specific range, and the composition distribution variation coefficient is within a specific range. Is obtained by copolymerizing ethylene having a specific relationship between the weight ratio of the cold xylene-soluble portion and the density and a α-olefin having a certain range of the number of carbon atoms, and the weight ratio is a certain range. It has been found that a film for a stretch label containing an ethylene / α-olefin copolymer component and a high-pressure method polyethylene component in which the density is in a specific range and the weight ratio is in a constant range can solve the above-mentioned problems, and the present invention It was completed.

That is, the present invention provides a melt flow rate
(MFR) is 0.1 to 10 g / 10 min, and the density is
(D) is 880 to 925 kg / m^ThreeAnd the following (expression
1) Cx = σ / SCBave. Where σ is the standard deviation of the composition distribution and SCBave.
Average value of short chain branch per 000C (1 / 1000C)
Represents ) Obtained from the composition distribution variation coefficient (Cx)
0.55 or less, the weight ratio of the cold xylene soluble part
(A) and density (d) are as follows (Equation 2): a <(4.8 × 10^-Five) × (950-d)^Three + (10^-6) × (950-d)^Four+1 (Formula 2) (where a is the weight ratio (wt%) of the cold xylene-soluble portion,
d is the density of the ethylene / α-olefin copolymer (Kg /
m^Three). ) And ethylene and carbon atoms
Ethylene obtained by copolymerizing α-olefins of Formulas 3 to 12
Ren-α-olefin copolymer (A) component 85-99 weight
% And density of 920 to 935 Kg / m ^ThreeIs high pressure
Containing 15 to 1% by weight of the polyethylene (B) component
Film for tretch labels and stretch labels
Label with at least one layer of film
The present invention relates to a multilayer film for metal.

[0010] Further, the preferred one of the present invention is the ethylene / α-olefin copolymer (A) component 73-
98% by weight, 12 to 1% by weight of the high pressure method polyethylene (B) component of the present invention and a density of 926 to 945 Kg / m ³
And a stretch label film containing 1 to 20% by weight of an ethylene / α-olefin copolymer (C) component or a high-density polyethylene (D) component having a density of 945 Kg / m ³ or more. The present invention relates to a stretch label multilayer film having at least one layer. Hereinafter, the present invention will be described in detail.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Ethylene / α used in the present invention
The olefin copolymer (A) component is an ethylene / α-olefin copolymer obtained by copolymerizing ethylene and an α-olefin having 3 to 12 carbon atoms. 3 carbon atoms
Examples of the α-olefin of No. 12 to No. 12 include propylene, butene-1, pentene-1, hexene-1, heptene-1, octene-1, nonene-1, decene-1, dodecene-1, 4-methyl-pentene -1,4-methyl-hexene-1, vinylcyclohexane, vinylcyclohexene, styrene, norbornene, butadiene, isoprene and the like, preferably hexene-1, octene-
It is one. The α-olefin having 3 to 12 carbon atoms may be used alone or in combination of two or more.

Ethylene / α-olefin copolymer (A)
Examples of the component include ethylene / propylene copolymer, ethylene / butene-1 copolymer, ethylene / hexene-1 copolymer, ethylene / octene-1 copolymer and the like, and preferably ethylene / hexene-1 copolymer. 1 copolymer and ethylene-octene-1 copolymer.

The ethylene / α-olefin copolymer (A) component used in the present invention has a melt flow rate (MF)
R) is 0.1 to 10 g / 10 minutes, preferably 0.5 to 1
0 g / 10 min, more preferably 0.5 to 4 g / 10
Min, most preferably 0.5 to 2 g / 10 min.

When the melt flow rate (MFR) of the copolymer (A) component is less than 0.1 g / 10 minutes, the extrusion load may be too high in the film forming, and
If it exceeds 0 g / 10 minutes, the self-stretchability and the film strength may decrease.

The density of the ethylene / α-olefin copolymer (A) component used in the present invention is from 880 to 925 kg.
/ M ³ , preferably 895-925 Kg / m ³ , more preferably 915-925 Kg / m ³ .

The density of the copolymer (A) component is 880 kg
/ M ³ , the rigidity of the film is too low, and it may not be suitable for use as a stretch bottle film from the viewpoint of handling properties and easy attachment to a bottle. If it exceeds 925 Kg / m ³ , the The elasticity may decrease.

The ethylene / α-olefin copolymer (A) component used in the present invention has a composition distribution variation coefficient (Cx) obtained from the following (formula 1) of 0.55 or less. Cx = σ / SCBave. Where σ is the standard deviation of the composition distribution and SCBave.
Average value of short chain branch per 000C (1 / 1000C)
Represents )

The above-mentioned composition distribution variation coefficient Cx is a measure of the composition distribution, and the smaller the value, the narrower the composition distribution. When the composition distribution variation coefficient (Cx) of the copolymer (A) component is 0.55 or less, the self-stretchability is excellent, and the strength is further improved. On the other hand, the composition distribution variation coefficient (Cx) of the copolymer (A) component is 0.55
When the value exceeds, the self-stretching property may be reduced, and the strength may be further reduced, so that the film may be broken at the time of label attachment.

The weight ratio (a) and the density (d) of the cold xylene-soluble portion of the ethylene / α-olefin copolymer (A) component used in the present invention have the following relationship (formula 2). a <(4.8 × 10 ⁻⁵ ) × (950−d) ³ + (10 ⁻⁶ ) × (950−d) ⁴ +1 (Formula 2) (where, a is the weight ratio of the cold xylene soluble part) (weight%),
d is the density of the ethylene / α-olefin copolymer (Kg /
m ³ ). When the weight ratio (a) and the density (d) of the cold xylene-soluble portion of the copolymer (A) component have the relationship of the above (Equation 2), the balance between low gloss, opacity and mechanical strength is obtained. Excellent in On the other hand, when the weight ratio (a) and the density (d) of the cold xylene-soluble portion of the copolymer (A) component do not have the relationship of the above-mentioned (Equation 2) (that is, a> (4. 8 × 10
^-5 ) × (950-d) ³ + (10 ^-6 ) × (950-d) ⁴
+1), the strength may be reduced, the surface gloss may be improved, or the anti-blocking property may be deteriorated.

The relationship between the weight ratio (a) and the density (d) of the cold xylene-soluble portion of the ethylene / α-olefin copolymer (A) component used in the present invention is more preferably the following (formula 3): <(4.8 × 10 ⁻⁵ ) × (950-d) ³ + (10 ⁻⁶ ) × (950-d) ⁴ (Formula 3) (where a is the weight ratio of the cold xylene-soluble portion (weight) %),
d is the density of the ethylene / α-olefin copolymer (Kg /
m ³ ). ), And most preferably the following (Formula 4) a <(4.8 × 10 ⁻⁵ ) × (950-d) ³ (Formula 4) (where a is the weight ratio of the cold xylene-soluble portion (weight) %),
d is the density of the ethylene / α-olefin copolymer (Kg /
m ³ ). )

The method for producing the ethylene / α-olefin copolymer (A) component used in the present invention is not particularly limited, and includes a known polymerization method using a known polymerization catalyst. Known polymerization catalysts include, for example, Ziegler-Natta catalysts, metallocene catalysts, and the like, and preferably metallocene catalysts. Known polymerization methods include, for example, a solution polymerization method, a slurry polymerization method, a high-pressure ionic polymerization method, a gas-phase polymerization method and the like, and preferably a gas-phase polymerization method and a high-pressure ionic polymerization method.

The metallocene catalyst is more preferably a catalyst system containing a transition metal compound having a group having a cyclopentadiene-type anion skeleton. Transition metal compound having a group having a cyclopentadiene type anion skeleton is a so-called metallocene compounds, usually in the general formula ML _a X _na (wherein, M is a Group 4 or Lanthanide series of the Periodic Table of Elements transition L is a group having a cyclopentadiene-type anion skeleton or a group containing a hetero atom, and at least one is a group having a cyclopentadiene-type anion skeleton. X is a halogen atom, hydrogen or a hydrocarbon group having 1 to 20 carbon atoms, n represents the valence of a transition metal atom, and a is an integer satisfying 0 <a ≦ n. They may be used alone or in combination of two or more. Further, the metallocene-based catalyst, the above-mentioned metallocene-based compound, an organoaluminum compound including an alumoxane compound, and / or trityl borate, ionic compounds such as anilinium borate, and / or SiO ₂ ,
A particulate carrier including an inorganic carrier such as Al ₂ O _{3 and} an organic polymer carrier such as an olefin polymer such as ethylene and styrene may be used in combination.

The high-pressure process polyethylene (B) component used in the present invention is a polyethylene obtained by polymerizing ethylene by a high-pressure process. Generally, a radical generator is used in a tank reactor or a tube reactor. It is produced by polymerizing ethylene under the conditions of a polymerization pressure of 140 to 300 MPa and a polymerization temperature of 200 to 300 ° C in the presence.

The density of the high-pressure polyethylene (B) component used in the present invention is 920 to 935 kg / m ³ ,
Preferably it is 925-935 Kg / m < ³ >, More preferably, it is 928-933 Kg / m < ³ >.

The density of the high-pressure polyethylene (B) component is 9
If it is less than 20 kg / m ³ , the rigidity is greatly reduced and may not be suitable as a stretch label film.
If it exceeds 35 kg / m ³ , the self-stretchability may be reduced.

The weight ratio of the ethylene / α-olefin copolymer (A) component used in the stretch label film of the present invention is 85 to 99% by weight (that is, the weight ratio of the high pressure process polyethylene (B) component is 15 to 99%). 1% by weight)
Preferably, the weight ratio of the ethylene / α-olefin copolymer (A) component is 90 to 97% by weight (that is, the weight ratio of the high-pressure polyethylene (B) component is 3 to 10% by weight). When the weight ratio of the ethylene / α-olefin copolymer (A) component is less than 85% by weight (that is, when the weight ratio of the high-pressure polyethylene exceeds 15% by weight), mechanical strength such as tear strength decreases. In some cases, the bottle may be broken when the bottle is installed, and the weight ratio of the ethylene / α-olefin copolymer (A) component exceeds 99% by weight (that is, the weight ratio of the high-pressure polyethylene is less than 1% by weight). In the case of), satisfactory self-stretchability cannot be obtained when the bottle is mounted, and the tightening force on the bottle may be reduced.

The component used in the stretch label film of the present invention is preferably from 73 to 98% by weight of the above-mentioned ethylene / α-olefin copolymer (A) component from the viewpoint of self-stretchability, rigidity and tightening force. An ethylene / α-olefin copolymer (C) component having a density of 926 to 945 Kg / m ³ and a density of 945 kg / m ³ ,
1 to 20 high-density polyethylene (D) components of ³ or more
% By weight. When the content of the ethylene / α-olefin copolymer (C) component or the high-density polyethylene (D) component exceeds 20% by weight, the self-stretchability may decrease.

The high-density polyethylene (D) component is usually
Ethylene alone or ethylene and a small amount of 3 to 1 carbon atoms
The α-olefin of No. 2 is polymerized using a Ziegler-Natta catalyst or a metallocene catalyst in the presence or absence of a solvent in a gas phase-solid phase, a liquid phase-solid phase or a homogeneous liquid phase. Polyethylene. The polymerization temperature is usually 30
To 300 ° C., and the polymerization pressure is normal pressure to 300 MPa.

In the production of the stretch label film of the present invention, the method of mixing the resin components is not particularly limited. For example, the ethylene / α-olefin copolymer (A) component and the high pressure polyethylene (B ) Components
If necessary, a method of dry-blending the ethylene / α-olefin copolymer (C) component or the high-density polyethylene (D) component, a method of melt-blending, and the like can be mentioned. Various blenders such as a Henschel mixer and a tumbler mixer are used for dry blending, and various mixers such as a single screw extruder, a twin screw extruder, a Banbury mixer and a hot roll are used for melt blending.

Examples of the method for producing the stretch label film of the present invention include a production method using a known inflation film production apparatus, a T-die cast film production apparatus, or the like. Further, the stretch label film preferred in the present invention is a stretch label multilayer film having at least one layer of the above stretch label film, and the method for producing the stretch label multilayer film is, for example, a component. Examples thereof include a method of co-extrusion of the resin mixture with other thermoplastic resin components and a method of extrusion coating (also referred to as an extrusion lamination method).

Further, a known lamination method in which the above-mentioned stretch label film is laminated on another thermoplastic resin can also be used. Known lamination methods include, for example, a dry lamination method, a wet lamination method, a sand lamination method, a hot melt lamination method, and the like. Other thermoplastic resins include, for example, polyolefin resins such as polypropylene and polybutene, and nylon 6 And polyamide resins such as nylon 66 and polyester resins such as polyethylene terephthalate and polybutylene terephthalate.

The stretch label film of the present invention may contain, if necessary, known stabilizers, lubricants, antistatic agents, processability improvers, antiblocking agents, etc., as long as the objects and effects of the present invention are not impaired. May be added.

As the stabilizer, for example, 2,6-di-t
-Butyl-p-cresol (BHT), tetrakis [methylene-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate] methane (trade name: IRG
ANOX 1010, manufactured by Ciba Specialty Chemicals), n-octadecyl-3- (4'-hydroxy-3,5'-di-t-butylphenyl) propionate (trade name: IRGANOX 1076, Ciba Specialty Chemicals) Phenolic stabilizers such as bis (2,4-di-t-butylphenyl) pentaerythritol diphosphite and tris (2,4-di-t-butylphenyl) phosphite. Is mentioned.

Examples of the lubricant include higher fatty acid amides and higher fatty acid esters, and examples of the antistatic agent include glycerin esters, sorbitan acid esters and polyethylene glycol esters of fatty acids having 8 to 22 carbon atoms. As the processability improver,
Examples thereof include fatty acid metal salts such as calcium stearate, and examples of the antiblocking agent include silica, calcium carbonate, and talc.

In the stretch label film of the present invention,
If necessary, the purpose of the present invention, the method of adding an additive to be added within a range that does not impair the effect is not particularly limited, a method in which the additive is previously melt-kneaded and then subjected to film processing, And a method of preparing a masterbatch of one or more additives and dry blending the mixture, and then subjecting the mixture to film processing.

[0036]

EXAMPLES The present invention will be described in detail below with reference to examples and comparative examples, but the present invention is not limited to these examples. The physical properties of the (co) polymer and the film used in the examples or comparative examples were measured according to the following methods.

(1) Density (d, unit: Kg / m ³ ) Measured according to the method specified in JIS K6760-1981. (2) Melt flow rate (MFR, unit: g / 10
Min) It was measured according to the method specified in JIS K6760. The load was 2.16 kg and the temperature was 190 ° C.

(3) Composition distribution variation coefficient (Cx) Measured using a multifunctional LC manufactured by Tosoh Corporation. The ethylene-α-olefin copolymer used in the present invention is treated at a predetermined temperature of 14.
Dissolve (concentration: 0.2 g / 20 ml) in orthodichlorobenzene (ODCB) solvent heated to 5 ° C, put into a column filled with sea sand in a column oven, and raise the temperature of the oven to 40 ° C / 60 min. To 125 ° C and 125
The temperature was lowered from C to -15 C over 14 hours. continue,
The temperature was raised at a rate of 10 ° C./60 minutes, raised to 125 ° C., and the relative concentration and branching degree of the copolymer flowing out during that time were measured by FT-IR connected to a column. Data is 10 ° C
7 points were captured at regular intervals. The temperature was raised to the final temperature while obtaining the relative concentration of the copolymer flowing out at each set temperature and the degree of branching (SCB) per 1000 main chain carbons. However, the relationship between each elution temperature and the degree of branching followed Equation (5) regardless of the type of comonomer. Also, SCB
No elution was performed at a temperature where was negative. SCB = −0.7322 × elution temperature (° C.) + 70.68 (Equation 5) A composition distribution curve is obtained from the obtained relative concentration and the degree of branching, and the average per 1000 carbons obtained from the curve using the equation (6). The degree of short chain branching (SCBave.) And the standard deviation (σ) of the composition distribution obtained from the equation (7) were obtained, and the composition distribution variation coefficient (Cx) representing the width of the distribution was obtained from the following (Equation 1). Cx = σ / SCBave. Where σ is the standard deviation of the composition distribution and SCBave.
Average value of short chain branch per 000C (1 / 1000C)
Represents Average short-chain branching degree (SCBave.) = ΣN (i) · W (i) (Equation 6) N (i): short-chain branching degree at i-th data sampling point W (i): i-th data sampling Relative concentration of point, ie, ΣW (i) = 1 Standard deviation of composition distribution (σ) = {Σ (N (i) −SCBave.) ² · W (i)} ^0.5 (Equation 7)

(4) Cold xylene soluble part (a, unit:% by weight) US code of federal regulations, Food and Drugs
Measured according to the method specified in 175.1520 of Administration.

(5) Permanent strain (unit:%) The longitudinal direction of the sample film is MD direction, and the width direction is TD.
A sample film having a length of 150 mm and a width of 15 mm was sampled so as to be oriented. The sample was set using a tensile tester so that the mark line interval (= gripping interval) was 100 mm, and at a tensile speed of 300 mm / min under a predetermined temperature atmosphere (23 ° C. or −10 ° C.), a predetermined strain rate ( 25%
Or 50%), immediately return at the same speed,
Finally, the sample was removed from the tensile tester. After leaving the opened sample under an environment of 23 ° C. and a relative humidity of 50% for a predetermined time, the mark interval E (mm) was measured, and the permanent strain was determined according to the following equation (8). Permanent set (%) = (E−100) / 100 × 100 (Equation 8) The smaller the value of the permanent set, the smaller the label sag and the better.

(6) Elongation Stress The elongation stress was measured in the same manner and under the same conditions as the measurement of the permanent strain, and the stress applied to the film sample immediately after the strain rate became 50% was measured. The larger the value is, the stronger the force for fastening the label to the bottle or the like is.

(7) 1% secant modulus (1% -Secan)
t Modulus) The longitudinal direction of the sample film is MD direction, and the width direction is TD.
A sample film having a length of 800 mm and a width of 20 mm was sampled so as to be oriented. This was set using a tensile tester so that the grip interval was 600 mm, and 5 m at 23 ° C.
tensile at a tensile speed of m / min, stress σ at 1% elongation
(N) was measured, and a 1% secant modulus was determined from the following equation (9). 1% secant modulus (MPa) = (σ / A) × 10 ⁻⁶ (Equation 9) (A indicates the cross-sectional area (m ² ) of the film.) The larger this value is, the more the label is attached to a bottle or the like. It shows that the properties are good.

Ethylene / α used in Examples and Comparative Examples
Table 1 shows the physical properties of the olefin copolymer (A) component, and Table 2 shows the physical properties of the high-pressure polyethylene (B) component, the ethylene / α-olefin copolymer (C) component and the high-density polyethylene (D) component. Indicated.

Example 1 Ethylene / α-olefin copolymer (A) component, high pressure polyethylene (B) component, synthetic aluminosilicate particles having an average particle size of 5 μm as an antiblocking agent, and erucamide as a lubricant And ethylenebisoleic acid amide were mixed with a tumble mixer.
The synthetic aluminosilicate particles, erucamide and ethylenebisoleic amide were blended so as to be 0.7% by weight, 0.04% by weight and 0.04% by weight, respectively. Table 3 shows the composition of the resulting mixture.

Next, the obtained mixture was processed at a processing temperature of 240 mm using a 40 mm / 50 mm φ co-extruder (L / D = 32) manufactured by Modern Machinery Co., Ltd., using a T-die molding machine having a die width of 600 mm and a lip opening of 0.9 mm. ℃, chill roll temperature 50 ℃,
A 90 μm thick film was formed under the conditions of an extrusion rate of 34 kg / hr and a forming speed of 11.7 m / min. Table 3 shows the measurement results of the physical properties of the obtained film.

Examples 2 and 3 Example 1 was repeated except that the ethylene / α-olefin copolymer (A) component, the high pressure polyethylene (B) component and the ethylene / α-olefin copolymer (C) component were mixed. Was carried out in exactly the same manner as in Table 3 shows the composition of the obtained mixture and the measurement results of physical properties of the obtained film.

Example 4 An ethylene / α-olefin copolymer (A) component, a high-pressure polyethylene (B) component and a high-density polyethylene (D) component were mixed to obtain the composition shown in Table 4. The operation was performed in exactly the same manner as in Example 1. Table 3 shows the composition of the obtained mixture and the measurement results of physical properties of the obtained film.

Comparative Examples 1 and 2 The same procedure as in Example 1 was carried out except that only the ethylene / α-olefin copolymer (A) was used. Table 4 shows the measurement results of the physical properties of the obtained film.

Comparative Example 3 The same procedure as in Example 1 was carried out except that the ethylene / α-olefin copolymer (A) component and the high-pressure low-density polyethylene (B) component were mixed. Table 4 shows the composition of the obtained mixture and the measurement results of physical properties of the obtained film.
It was shown to.

Comparative Example 4 The same procedure as in Example 1 was carried out except that the ethylene / α-olefin copolymer (A) component and the high-density polyethylene (D) component were mixed. Table 4 shows the composition of the obtained mixture and the measurement results of physical properties of the obtained film.

[0051]

[Table 1] (Note 1) a '= (4.8 × 10 ⁻⁵ ) × (950−d) ³
+ (10 ⁻⁶ ) × (950−d) ⁴ +1 A1: Ethylene hexene-1 copolymer (manufactured by Nippon Evolu Co., Ltd., sold by Sumitomo Chemical Co., Ltd., Sumikasen EF)
V205) A2: Ethylene hexene-1 copolymer (Sumitomo Chemical Co., Ltd.)
Sumikasen αFZ202-0, manufactured by Co., Ltd.)

[0052]

[Table 2] B1: High-pressure ethylene copolymer (Sumitomo Chemical Co., Ltd.)
C1: Ethylene-butene-1 copolymer (Sumitomo Chemical Co., Ltd., Sumikasen LFS370) C2: Ethylene-hexene-1 copolymer (Sumitomo Chemical Industries, Ltd.)
D1: High density polyethylene (Idemitsu Petrochemical Co., Ltd., Idemitsu polyethylene 445M)

[0053]

[Table 3]

[0054]

[Table 4]

Examples 1-4 satisfying the requirements of the present invention are:
It can be seen that it is excellent in permanent set (slack of label), extensional stress (clamping force of label), and 1% secant modulus (label mountability). On the other hand, in Comparative Example 1 in which the high-pressure polyethylene (B) component, which is a requirement of the present invention, was not used, the permanent set (sag of the label) and the elongation stress (the clamping force of the label) were insufficient.

Further, ethylene / α-
Comparative Example 2, which did not satisfy the olefin copolymer (A) component and did not use the high-pressure polyethylene (B) component, which is a requirement of the present invention, showed permanent set (slack of label) and elongation stress (label of label). Insufficient tightening force) and 1% secant modulus (label mounting)

The ethylene / α, which is a requirement of the present invention,
-Comparative Example 3 not satisfying the olefin copolymer (A) component
Is insufficient in permanent set (slack of label), extensional stress (clamping force of label) and 1% secant modulus (label mountability), and furthermore, high-pressure polyethylene (B) which is a requirement of the present invention. It can be seen that Comparative Example 5 in which no component was used had insufficient permanent set (sag of the label).

[0058]

As described above, according to the present invention,
It is possible to obtain a stretch label film in which self-stretchability is maintained at a high level, rigidity is high, bottle mountability is excellent, and tightening force is high.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G09F 3/04 G09F 3/04 C // (C08L 23/08 (C08L 23/08 23:06) 23: 06) (72) Inventor Satoru Koyama 5-1, Anesaki Kaigan, Ichihara-shi, Chiba F-term within Sumitomo Chemical Co., Ltd. 3E086 AB01 AD30 BA04 BA15 BA33 BB66 BB85 CA40 4F071 AA12X AA15 AA15X AA16 AA17 AA21X AA22A A82 AF21 AF58 AG21 AH04 AH06 BA01 BB06 BB09 BC01 BC07 4F100 AK05A AK06A AK62A AL05A BA01 GB16 JA06A JA13A JK01 JK08 YY00A 4J002 BB021 BB032 BB033 BB051 BB053 BB101 CF00 FD030 GG170 FD 170

Claims (3)

[Claims] 1. A melt flow rate (MFR) of 0.1 to 1.
10 g / 10 min, and the density (d) is 880 to 925 k
g / m ³ , the composition distribution variation coefficient (Cx) obtained from the following (Equation 1) is 0.55 or less, and the weight ratio (a) and density (d) of the cold xylene-soluble portion are as follows: 85-99% by weight of an ethylene / α-olefin copolymer (A) component obtained by copolymerizing ethylene having the relationship 2) and an α-olefin having 3 to 12 carbon atoms, and a density of 920 to 99%
A stretch label film, comprising 15 to 1% by weight of a high pressure method polyethylene (B) component of 935 kg / m ³ . Cx = σ / SCBave. Where σ is the standard deviation of the composition distribution and SCBave.
Average value of short chain branch per 000C (1 / 1000C)
Represents ) A <(4.8 × 10 ⁻⁵ ) × (950−d) ³ + (10 ⁻⁶ ) × (950−d) ⁴ +1 (Formula 2) (where, a is the weight of the cold xylene soluble part) Ratio (% by weight),
d is the density of the ethylene / α-olefin copolymer (Kg /
m ³ ). ) 2. The ethylene / α-olefin copolymer (A) component according to claim 1, 73 to 98% by weight, the high pressure process polyethylene (B) component according to claim 1 to 12% by weight and a density of 926 to The ethylene / α-olefin copolymer (C) component having a density of 945 kg / m ³ or a density of 945 kg / m ³
m ³ or more in a high density polyethylene component (D) 1 to 20
A film for a stretch label, characterized by containing by weight. 3. A multilayer film for a stretch label, comprising at least one layer of the film for a stretch label according to claim 1.