JP2001199023A - Easy cutting laminate and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easy cutting laminate excellent in heat resistance and oil resistance, good in the adhesiveness of respective layers and excellent in cutting properties. SOLUTION: The easy cutting laminate is constituted by laminating a layer comprising a resin composition, which contains 40-80 weight % of (A) polypropylene with a melt flow rate of 1-100 g/10 min, 10-50 weight % of (B) branched low density polyethylene with a melt flow rate of 1-100 g/10 min and a density of 0.910-0.935 g/cm3 and 10-50 weight % of (C) high density polyethylene with a melt flow rate of 1-100 g/10 min and a density of 0.930 g/cm3 or more, on a base material by extrusion lamination.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an easy-cut laminate comprising a substrate and a specific resin composition layer and a method for producing the same, and more particularly, to a plastic substrate, a metal substrate such as aluminum, paper, and the like. Good adhesion between various base materials such as cellophane and the polypropylene resin composition layer,
The present invention relates to an easy-cut laminate having sufficient easy-cut properties and further having excellent heat resistance, oil resistance, and the like, and a method for producing the same.

[0002]

2. Description of the Related Art In general light packaging, easy cutability that can be easily opened by hand is demanded. As a method of easily opening the packaging material by hand, various methods such as a method of making a cut in an edge of the packaging material and a method of applying a laser or a mechanical streak to the surface of the packaging material have been put to practical use. Polypropylene resin (hereinafter abbreviated as "PP")
Since it is excellent in heat resistance and oil resistance, it is used as a sealant in the innermost layer of a laminate used for a packaging material.

[0003] However, if the PP is cut by hand, the PP itself grows and cannot be cut cleanly. Therefore, in the case of a packaging material having a layer made of PP, sufficient ease of cutting was not obtained by any of the above-described methods. As a packaging material having improved cutability, a laminate is used in which unstretched PP is laminated on a uniaxially or biaxially stretched base material by a dry lamination method or the like. However, even with this packaging material, sufficient easy-cutting properties have not yet been obtained. In other words, when dry-laminated on a substrate, if the adhesive strength between the PP and the substrate is low, the resin strength of the PP film used in the dry lamination is strong and easily stretched, so that the cut property of the packaging material is deteriorated. It is considered to be.

In the extrusion lamination method, PP is 20
High speed molding of 0 m / min or more is possible, and it is suitable for mass production at low cost. However, since the adhesive strength to the substrate is low and the adhesiveness to the anchor coating agent is low, the substrates that can be used for extrusion lamination of PP are limited. As the extrusion lamination method of PP, for example, a method of bonding PP to a biaxially stretched polypropylene substrate (hereinafter abbreviated as “OPP”) using heat welding, or a method of impregnating a paper substrate with PP, Generally, a method of bonding a PP to the PDP is common.

[0005] PP for extrusion lamination is set at a high melt flow rate in order to improve adhesion and high-speed moldability. Therefore, the resin strength is weaker than that of PP for dry lamination, and has a certain degree of easy-cutting property. However, easy cutability was insufficient due to poor adhesion to the substrate.

[0006] For this reason, if the adhesive strength between the extrusion-laminated PP and the substrate can be improved, the cutability of the packaging material can be expected to be improved. Various methods have been proposed to improve the adhesive strength. For example, Japanese Patent Application Laid-Open No. 57-157724
Japanese Patent Application Laid-Open No. 7-314629 proposes a method in which a gaseous mixture containing ozone is sprayed onto a bonding surface of a polyolefin resin in a molten state to positively introduce a polar group into the surface of the polyolefin resin. Japanese Patent Application Laid-Open Publication No. HEI 7-152139 proposes a method in which an ozone treatment of a polyolefin resin and a surface treatment such as corona discharge to a substrate are used in-line before bonding.

[0007] In the case of polyethylene, a polar group is positively introduced into the resin surface by a method of blowing a mixture containing ozone to the adhesive surface side of the molten resin, thereby improving the adhesive strength. However, in the case of PP, although the adhesive strength to paper was improved, the adhesive strength to a plastic substrate and its anchor coat surface was hardly improved.

[0008]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a composition having excellent heat resistance and oil resistance, good adhesion between layers,
An object of the present invention is to provide an easy-cut laminate having excellent cut properties and a method for producing the same.

[0009]

Means for Solving the Problems As a result of intensive studies in view of the above problems, the present inventors have found that a resin composition for lamination formulated with a specific composition is extruded onto a substrate while preferably subjected to ozone treatment. The inventors have found that the above problem can be solved by laminating, and have reached the present invention.

That is, the easily cut laminate of the present invention comprises:
It has a base material and a resin composition layer obtained by extrusion laminating the resin composition on the base material, and the resin composition is (A) a polypropylene 40 having a melt flow rate of 1 to 100 g / 10 minutes. And (B) a melt flow rate of 1 to 100 g / 10 minutes and a density of 0.910 to
10 to 50% by weight of a branched low-density polyethylene having 0.935 g / cm ³ and (C) a melt flow rate of 1 to
100 g / 10 min and a density of 0.930 g / cm ³
It is characterized by containing 10 to 50% by weight of the high density polyethylene described above. Further, the base material is preferably an easily cut plastic material. Also,
It is preferable that the substrate has a layer made of an easily cut plastic material and a layer made of at least one selected from the group consisting of plastic, metal foil, cellophane, paper, nonwoven fabric and woven fabric.

Further, the method for producing an easily cut laminate according to the present invention is characterized in that (A) a melt flow rate of 1 to 10
0-g / 10 min polypropylene 40-80% by weight
And (B) 10 to 50% by weight of a branched low-density polyethylene having a melt flow rate of 1 to 100 g / 10 minutes and a density of 0.910 to 0.935 g / cm ³ ,
(C) When extruding and laminating a resin composition containing 10 to 50% by weight of high-density polyethylene having a melt flow rate of 1 to 100 g / 10 min and a density of 0.930 g / cm ³ or more, The surface of the molten film of the resin composition on the side in contact with the material is subjected to ozone treatment. Further, the ozone treatment is performed in an amount of 0.01 to 1 g / m 2 based on the surface area of the molten film of the resin composition on the side in contact with the substrate.
Preferably, the ozone treatment amount is ² .

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
As the polypropylene (A) (hereinafter abbreviated as PP or (A) component) in the present invention, for example, propylene homopolymer, ethylene-propylene random copolymer, ethylene-propylene block copolymer, propylene and carbon number Examples thereof include random or block copolymers with 4 to 16 α-olefins, and multi-component copolymers thereof. Among these, an ethylene-propylene random copolymer is preferably used. The random copolymerization ratio in the ethylene-propylene random copolymer is preferably from 1 to 10% by weight in terms of ethylene amount, and from 3 to 8%.
% By weight is more preferred.

[0013] PP melt flow rate (JIS K6
921. The PP resin shows a measured value at 230 ° C., hereinafter abbreviated as “MFR”) is 1 to 100 g / 10
Min, and the range of 10 to 50 g / 10 min is particularly preferable from the viewpoint of moldability. When the MFR is less than 1 g / 10 minutes, the film strength becomes too strong, and the cut property becomes poor. If the MFR is more than 100 g / 10 minutes, cut lamination is good, but extrusion lamination is substantially difficult.

(B) Branched low-density polyethylene (hereinafter, referred to as
LDPE or component (B)) is generally 1000
One of the features is that it is obtained by polymerization under a high pressure of up to 3500 atm and in the presence of a free radical generator such as peroxide, and has many long-chain branches. It is known that it has excellent extrusion characteristics due to its structure having long-chain branching, and it is particularly suitably used for extrusion lamination. The reactor used for this polymerization may be either an autoclave type or a tubular type.

LDPE melt flow rate (JIS
According to K6922. Ethylene resin shows a measured value at 190 ° C., hereinafter abbreviated as “MFR”).
g / 10 minutes, preferably 2 to 50 g / 10 minutes. M
If the FR is less than 1 g / 10 minutes, molding is difficult and dispersibility in PP becomes poor. MFR is 100g / 10
If the amount exceeds minutes, the neck-in becomes large, and the moldability during extrusion lamination becomes poor.

The density of LDPE is 0.910 to 0.93.
5 g / cm ³ , preferably 0.915 to 0.92
5 g / cm ³ . Density 0.910 g / cm less than ^3, or exceeds 0.935 g / cm ^3, it is substantially difficult to produce industrially.

(C) High-density polyethylene (hereinafter HDP)
E or (C) is generally used to homopolymerize ethylene using a catalyst called a Ziegler catalyst, a Phillips catalyst, or a metallocene catalyst, or to copolymerize ethylene with an α-olefin having 3 to 16 carbon atoms. Obtained by These can be generally produced by any of low-pressure, medium-pressure, and high-pressure methods, and are produced by any of a gas phase method, a solution method, and a slurry method.

The MFR of HDPE is 1 to 100 g / 10
Min, and preferably 5 to 50 g / 10 min. MFR is 1
If it is less than g / 10 minutes, molding is difficult and PP
The dispersibility to the water becomes worse. If the MFR exceeds 100 g / 10 minutes, the neck-in becomes large and the moldability during extrusion lamination becomes poor. The density of HDPE is 0.930 g /
cm ³ or more, preferably 0.945 g / cm ³ or more. When the density is less than 0.930 g / cm ³ , properties such as heat resistance and oil resistance are reduced.

The content of the component (A) in the resin composition used in the present invention is from 40 to 80% by weight. (A)
When the content of the component is less than 40%, properties such as heat resistance and oil resistance do not appear, and when it exceeds 80%, the effect of ozone treatment at the time of bonding does not improve. The content of each of the component (B) and the component (C) is 10 to 50% by weight. If the content of the component (B) is less than 10% by weight, processability and physical properties of PP are adversely affected. If it exceeds 50% by weight, properties such as heat resistance and oil resistance do not appear. When the content of the component (C) is less than 10% by weight, the processability and the physical properties of PP are adversely affected,
If it exceeds 50% by weight, properties such as heat resistance and oil resistance do not appear.

By blending polyethylene at a high concentration with the PP used in the present invention to form a composition,
The introduction of a polar group by ozone treatment becomes possible even with a PP-based composition, and desirably, in combination with an anchor coat agent,
Strong adhesive strength with various base films can be obtained. Further, by using both LDPE and HDPE as polyethylene, it is possible to obtain an effect of improving formability by LDPE and an effect of improving cuttability by HDPE.

The resin composition used in the present invention may contain, if desired, conventional additives such as antioxidants, plasticizers, lubricants, various stabilizers, antiblocking agents, antistatic agents, pigments, various inorganic and organic compounds. A filler or the like may be added.

The resin composition used in the present invention is obtained by mixing the above components (A) to (C) with a Henschel mixer, a ribbon mixer, or the like, or further mixing the resulting mixture with an open roll, a Banbury mixer, a kneader, or an extruder. It can be obtained by appropriately using a method of melt-kneading using the method described above. The kneading temperature is usually higher than the melting point of the resin to 3
50 ° C, preferably 170-300 ° C, 180-
250 ° C. is more preferred.

The easy-cut laminate of the present invention (hereinafter, abbreviated as a laminate) has a substrate, and a resin composition layer formed by extrusion-laminating the above-mentioned resin composition on the substrate. The surface of the resin composition layer in contact with the base material has been ozone-treated. Although it does not specifically limit as a base material, For example, polyamide 6, polyamide 66,
In addition to polyamide resins such as polyamide 6.66 and polyamide 12, polyester resins such as polyethylene terephthalate and polybutylene terephthalate;
A film of a thermoplastic resin such as a saponified vinyl acetate copolymer, polystyrene, PP, polyethylene, or polycarbonate is preferably used. These films are preferably oriented such as uniaxial or biaxial stretching. In addition, metal foil such as aluminum, iron, copper, and tin, paper, cellophane, and the like are also preferably used.

In the case where a particularly high easy-cutting property is required, it is preferable to use a substrate containing an oriented substrate such as uniaxial or biaxial stretching or rolling as the substrate. Specifically, a uniaxially or biaxially stretched and rolled material of a crystalline resin such as a polyethylene resin, a polypropylene resin, a polyamide resin, and a polyester resin is used alone or as a base, and plastic, foil, paper, It is also possible to use a laminate in which a nonwoven fabric, a woven fabric and the like are laminated.

As a specific example of the laminate, OPP / A
C / S, ONY / AC / S, OPET / AC / S, paper /
AC / S, LD / paper / S, OPP / paper / S, LD / ad /
ONY / ad / S, LD / ad / OPET / ad / S and the like. Here, OPP: biaxially oriented polypropylene,
AC: anchor coating agent, S: resin composition in the present invention, ONY: biaxially stretched nylon, OPET: biaxially stretched polyester, LD: branched low density polyethylene, ad: adhesive.

The substrate according to the present invention may be subjected to a known surface treatment technique such as an anchor coat treatment, a corona treatment, a plasma treatment, a flame treatment, an electron beam irradiation treatment, or an ultraviolet irradiation treatment as a surface treatment. In addition, pre-processing such as printing, engraving, embossing, and the like may be performed.

The types of anchor coats used for the anchor coat treatment include isocyanate-based anchor coat agents, polyethyleneimine-based anchor coat agents, polybutadiene-based anchor coat agents, and organic titanium-based anchor coat agents. The adhesive strength between the material layers is improved, and any of them is suitably used.

As the isocyanate-based anchor coating agent, as in the case of the adhesive for dry lamination, there are a one-pack reaction type and a two-pack reaction type, and both are suitably used. The solid concentration is preferably 1 to 19%. The amount of the solid applied is 0.01 to 2.
4 g / m ² is preferred. The polyethyleneimine-based anchor coating agent contains polyethyleneimine polymerized from very reactive ethyleneimine as a main component. Since polyethyleneimine is water-soluble, when it is used as an anchor coat agent, a mixture of water and a lower alcohol or the like is used as a diluent. The polybutadiene-based anchor coating agent is obtained by modifying both ends of a 1,2-polybutadiene chain with a hydroxyl group or a carboxyl group and dispersing in water.

The organic titanium-based anchor coating agent is a titanium compound having an organic group. Examples of the organic titanium-based anchor coating agent include, in addition to alkyl titanate having a Ti—O—C type bond, titanium acylate, titanium chelate and the like. Among them, alkyl titanate is preferably used. Alkyl titanates have the general formula Ti (OR) ₄
It is represented by R represents an alkyl group [C _n H _{2n + 1} ,
For example, methyl group (-CH _3), ethyl group (-C ₂ H ₅₎
Or an allyl group (CH ₂ ＣＨCH—CH ₂ —). Representative alkyl titanates include tetraisopropyl titanate [TPT, Ti (OC ₃ H ₇ )
₄ , colorless liquid], tetranormal butyl titanate [T
BT, Ti (OC ₄ H ₉ ) ₄ , slightly yellow liquid], tetrastearyl titanate [TST, Ti (OC ₁₈ H ₃₇ ) ₄ , yellow waxy solid] and the like. Hexane or toluene is used as the solvent. After the anchor coating agent is applied to the substrate, the solvent is evaporated in a drying step, and then a cured film is obtained by hydrolysis and the alcohol liberated at that time is evaporated.

The laminate of the present invention is produced by extrusion laminating the above-mentioned resin composition for lamination on a substrate. Here, when the resin composition for lamination is extrusion-laminated on the substrate, the surface of the molten film of the resin composition for lamination on the side in contact with the substrate is subjected to ozone treatment.

FIG. 1 is a schematic sectional view showing an example of an extrusion laminating apparatus used for manufacturing a laminate of the present invention.
This extrusion laminating apparatus includes a T-die 2 for extruding a molten film 1 of a laminating resin composition, a pressure roll 4 and a cooling roll 5 for pressing the molten film 1 on a substrate 3, and an ozone nozzle 6 for blowing ozone gas. And is schematically configured.

The extrusion laminating method is a method in which the molten film 1 extruded from the T-die 2 is continuously formed and pressed on a substrate 3 and is a processing method in which forming and bonding are performed simultaneously. The molding temperature at the time of extrusion lamination molding is generally from 200 to 350C, preferably from 240 to 310C. When the molding temperature is 200
If the temperature is lower than 0 ° C, sufficient adhesive strength cannot be obtained. If the temperature exceeds 350 ° C, the moldability deteriorates, and the physical properties of the obtained laminate, such as odor and heat sealability, deteriorate.

As the T-die 2, there are a coat hanger type, a straight manifold type and the like, and any of them is suitably used. There are various types of deckles for adjusting the width and thickness, such as an outer deckle and an inner deckle, all of which are suitably used. Among them, a straight manifold inner deckle type has a mechanism that can adjust the width due to the necessity of manufacturing products of various widths and cancels the effect on the thickness unevenness due to the neck-in that always occurs in T-die molding. Is more preferably used.

The distance from the lip surface of the T-die 2 to the contact of the molten film 1 with the cooling roll 5 is called an air gap, and the surface of the molten film 1 extruded during this time is oxidized to improve the adhesiveness. The air gap is usually 70 mm to 300 mm, and preferably 100 mm to 200 mm.

In the method of manufacturing a laminate of the present invention, the surface of the molten film 1 of the resin composition for lamination is oxidized by performing ozone treatment between the air gaps. The ozone treatment is performed by blowing air containing ozone to the surface of the molten film 1 of the resin composition for lamination. The method of generating ozone is industrially performed by converting oxygen in the air into ozone, and there are a silent discharge type, a creeping discharge type and the like, but a high-concentration silent discharge type is preferable.

In the present invention, the ozone treatment amount To ₃ (g / m
² ) is calculated by the following equation. To ₃ = ([O ₃ ] × Qo ₃ ) / (V × W) where [O ₃ ] = ozone generation concentration (g / Nm ³ ), Qo
₃ = ozone flow rate (Nm ³ / hr), V = forming speed (m / h)
r), W = ozone treatment width (m).

The ozone treatment amount To ₃ is the number of grams of ozone sprayed on the molten film 1 per unit area. The amount of ozone treatment is 0.01 to 1 g / m ² . If the ozone treatment amount is less than 0.01 g / m ² , sufficient adhesive strength cannot be obtained, and the cuttability will be reduced. Ozone treatment amount is 1 g / m ²
Above, ozone diffuses into the surroundings, deteriorating the work environment,
There is a risk of causing corrosion of equipment and deterioration of product odor.

The ozone generation concentration is represented by the weight of ozone contained in a fixed volume of air. In the present invention, 1 to 100 g / Nm ³ (Nm ³ represents 1 m ³ in a standard state) is preferable, and 10 to 70 g / Nm ³ is more preferable. At a low concentration of less than 1 g / Nm ³ , it is necessary to remarkably increase the amount of ozone to be blown in order to obtain the required surface oxidation, which undesirably results in scattering of toxic ozone to the working environment. 100 g / Nm ³
Ozone with a concentration higher than that is difficult to generate on equipment.

In the method of spraying ozone, ozone guided to the vicinity of the molten film 1 of the resin composition for lamination through a corrosion-resistant pipe (not shown) such as stainless steel is provided at the tip of the corrosion-resistant pipe. The method of spraying from the ozone nozzle 6 is preferable. As the position of the ozone nozzle 6, FIG.
As shown in FIG. 2, a position at which ozone can be put on the air flow along the substrate 3 from the side of the T die 2, or a position at which ozone is directly blown onto the molten film 1 of the laminating resin composition as shown in FIG. Are preferred. Above all, from the viewpoint of preventing the molten film 1 from being disturbed by an air flow, a position where ozone can be put on an air flow along the substrate 3 from the side of the T die 2 as shown in FIG. 1 is preferable.

The width of the ozone nozzle 6 is defined as an ozone treatment width in the present invention. The width of the ozone treatment must be smaller than the width of the molten film 1. If it is wider than the molten film 1, ozone diffuses to the opposite surface or the vicinity of the cooling roll 5, causing corrosion of the apparatus, deterioration of the smell of the laminated product, deterioration of the working environment, and the like. Generally, the width of the ozone treatment is 2 to 2 times the width of the molten film 1.
Preferably, it is 10 cm narrower. In addition, it is preferable to provide a local exhaust equipment for exhausting smoke and unnecessary ozone as needed.

The flow rate of blowing ozone must be adjusted by the width of the laminate to produce the amount of spraying per 1m width is ^{0.5Nm 3 / hr~10Nm 3 / hr (} hr
Represents 1 hour), preferably 1 Nm ³ / hr to 8 Nm
³ / hr is more preferred. If it is less than 0.5 Nm ³ / hr, it is necessary to remarkably increase the concentration of ozone to be sprayed in order to obtain necessary surface oxidation, which is practically difficult. 1
If it exceeds 0 Nm ³ / hr, toxic ozone is undesirably dispersed in the working environment.

The molten film 1 of the laminating resin composition whose surface has been oxidized by ozone is pressed and bonded to the substrate 3 by the cooling roll 5 and the pressure roll 4. The cooling roll 5 can adjust the temperature by circulating a heat medium inside. Water is generally used as the heat medium. The temperature is between 5C and 60C, more preferably between 20C and 40C.
If the temperature is lower than 5 ° C., it is difficult to suppress the dew condensation on the roll surface. If the temperature is higher than 60 ° C., the resin composition for lamination adheres to the roll and becomes difficult to peel off.

The pressure roll 4 is formed by winding various heat-resistant elastic bodies around the surface of a metal roll. As the material of the heat-resistant elastic body, various rubbers such as neoprene, hypalon, and silicon, and Teflon are generally used. It is more preferable that the pressure roll 4 is water-cooled from the inside.

The resin composition used in the present invention is generally extrusion-laminated on a substrate in a single layer.
A plurality of layers may be laminated at a time by a coextrusion lamination method. In that case, the above-mentioned resin composition is used on the surface in contact with the base material. In the method for producing a laminate of the present invention, the surface of the base material 3 may be activated by performing an anchor coat treatment before the extruded molten film 1 comes into contact with the base material 3. Aging may be performed according to the type and necessity of the anchor coat. The drying temperature and time of the isocyanate-based anchor coating agent and the polybutadiene-based anchor coating agent are preferably 30 to 70 ° C. and 24 to 72 hours,
More preferably, the temperature is from 40 to 50 ° C. for 24 to 48 hours.

[0045]

Next, the present invention will be described with reference to examples. Note that the present invention is not limited to these examples.
The production of the laminates of the examples and the comparative examples and the measurement of each property value of the laminates were performed by the following methods.

(1) Production of Resin Composition The kneaded pellets of the component (A) + the component (B) and the pellets of the component (C) were dry-blended with a Henschel mixer to produce a desired resin composition. . (A)-(C)
The following components were used. (A) Component (PP) A-1: MFR 20 g / 10 min, density 0.900 g / c
m ³ , ethylene-propylene random copolymer having an ethylene content of 4% by weight A-2: MFR 20 g / 10 min, density 0.900 g / c
m ³ , ethylene-propylene random copolymer having an ethylene content of 6% by weight

(B) Component (LDPE) B-1: MFR 20.0 g / 10 min, density 0.917 g
/ Cm ³ LDPE B-2: MFR 7.0 g / 10 min, density 0.917 g /
cm ³ of LDPE (C) component (HDPE) C-1: MFR20.0g / 10 min, density 0.963g
/ Cm ³ HDPE C-2: MFR 22.0 g / 10 min, density 0.961 g
/ Cm ³ HDPE

(2) Manufacture of Laminate A pellet of the resin composition was extrusion-laminated on various substrates under the following conditions using an extrusion laminating machine (manufactured by Modern Machinery) having an extruder having a diameter of 90 mm. Then, a laminate comprising the base material and the resin composition layer was manufactured.
Furthermore, after manufacturing a laminated body, aging treatment was performed at 40 ° C. for 48 hours. Air gap: 120 mm Molding resin temperature: 280 ° C. Laminating speed: 100 m / min Anchor coat: urethane-based anchor coating agent Anchor drying temperature: 80 ° C. Ozone generation concentration: See Table 1 Ozone flow rate: See Table 1 Ozone treatment width (nozzle width) ): 800 mm Laminate thickness: 20 μm, Laminate width: 860 mm Base material: 12 μ-thick Unitika biaxially stretched PET or 3
0μ thickness Sumitomo Light Metal Aluminum Foil

(3) Measurement of Adhesive Strength The laminate obtained by the above-described process was placed 15 m in the flow direction.
It was cut into strips having a width of m and peeled off at the interface between the base material and the resin composition layer. The peeling strength at a peeling rate of 300 mm / min and 180 ° peeling was defined as the adhesive strength. (4) Evaluation of Cutability A cut was made in the laminate obtained by the above process at right angles to the flow direction with a razor, and the cut was slowly torn by hand. The cutability was evaluated on a three-point scale based on the manner of tearing at this time. ：: There is slight stringing, but it breaks linearly. Δ: The film is partially stretched in a film shape, but is cut linearly. X: The resin composition layer is not stretched and cut.

Example 1 Using the components (A) to (C) shown in Table 1, the kneaded pellets of the components (A) + (B) and the pellets of the component (C) were dry blended with a Henschel mixer. Thus, pellets of the desired resin composition were obtained.
A biaxially stretched polyester film having a width of 860 mm and a thickness of 12 μm (manufactured by Unitika Ltd., hereinafter referred to as P
ET), resin temperature 280 ° C, take-off speed 100
m / min, extrusion lamination with a lamination thickness of 20 μm,
A laminate was manufactured. Here, the extrusion lamination is performed by an ozone treatment on a molten film of the resin composition for lamination and an anchor coat treatment on PET (2710A / D by Nichinseika Co., Ltd.).
B) was performed. Table 1 shows the results. In the obtained laminate, the adhesion between the PET and the resin composition layer was good, and no decrease in adhesion was observed.

[Examples 2 to 7] Extrusion lamination was performed in the same manner as in Example 1 except that the composition and the amount of ozone treatment were changed as shown in Table 1 to produce a laminate. Table 1 shows the results. In the obtained laminate, the adhesion between the PET and the resin composition layer was good, and no decrease in adhesion was observed.

Example 8 Extrusion lamination was carried out in the same manner as in Example 1 except that a 30 μm aluminum foil was used as a base material to produce a laminate. Table 1 shows the results. In the obtained laminate, the adhesiveness between the substrate and the resin composition layer was good, and no decrease in adhesion was observed.

[Comparative Example 1] Extrusion lamination was performed in the same manner as in Example 1 except that the component (A) was 90% by weight and the component (C) was not added, to produce a laminate. Table 1 shows the results. Since the blending amount of the polyethylene component (B + C) was insufficient and there was no component (C), the adhesive strength was weak and the cut property was poor.

Comparative Example 2 Extrusion lamination was carried out in the same manner as in Example 1 except that the component (C) was 20% by weight and the component (B) was not added, thereby producing a laminate. Table 1 shows the results. Since there was no component (B), the resin composition could not be molded stably.

[0055]

[Table 1]

[0056]

As described above, the easy-cut laminate of the present invention has a substrate and a resin composition layer obtained by extrusion-laminating the resin composition on the substrate. The composition comprises (A) 40 to 80% by weight of polypropylene having a melt flow rate of 1 to 100 g / 10 min, and (B) a melt flow rate of 1 to 100 g / 10 min and a density of 0.910 to 0. 10 to 50% by weight of a branched low-density polyethylene having a density of 0.93 g / cm ³ , (C) a melt flow rate of 1 to 100 g / 10 min, and a density of 0.93
High density polyethylene 10 to 50 g / cm ³ or more
% By weight, it has excellent heat resistance and oil resistance,
Good adhesion between layers and excellent cutability.

Further, in the easy-cut laminate of the present invention, if the base material is an easily-cut plastic material, a laminate having more excellent cut properties can be obtained. In the easy-cut laminate of the present invention, the base material is a layer and a plastic made of an easy-cut plastic material,
As long as it has at least one layer selected from the group consisting of metal foil, cellophane, paper, nonwoven fabric and woven fabric, it is possible to obtain a laminate having the characteristics of each layer and excellent cutability. it can.

According to the method for producing an easily cut laminate of the present invention, when the resin composition is extrusion-laminated on a substrate, the surface of the molten film of the resin composition on the side in contact with the substrate is formed. Since the ozone treatment is performed, it is possible to obtain an easy-cut laminate having excellent heat resistance and oil resistance, good adhesion between layers, and excellent cut property. In the method for producing an easily-cut laminate according to the present invention, the ozone treatment may be performed in an amount of 0.01 to 1 g / m ² with respect to the surface area of the molten film of the laminating resin composition in contact with the substrate. When it is performed in an amount, it is possible to obtain an easy-cut laminate having excellent heat resistance and oil resistance, good adhesion between layers, and excellent cut properties without adversely affecting the working environment.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an example of an extrusion laminating apparatus used for manufacturing a laminate of the present invention.

FIG. 2 is a schematic sectional view showing another example of an extrusion laminating apparatus used for manufacturing a laminate of the present invention.

[Explanation of symbols]

 1 ... Molten film, 3 ... Base material

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshimasa Saito 2-3-2, Yakko, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Inside the Research and Development Center, Japan Polyolefin Co., Ltd. (72) Inventor Masahiro Wakayama Kawasaki-shi, Kanagawa 2-3-2 Yakko, Kawasaki-ku F-term (Reference) in Research and Development Center, Technology Headquarters, Japan Polyolefin Co., Ltd. JA13B JB07 JJ03 JK06 JL01 YY00B

Claims (5)

[Claims] 1. A resin composition comprising: a substrate; and a resin composition layer formed by extrusion laminating the resin composition on the substrate, wherein the resin composition has (A) a melt flow rate of 1 to 1.
40 to 80% by weight of polypropylene which is 00 g / 10 minutes
And (B) 10 to 50% by weight of a branched low-density polyethylene having a melt flow rate of 1 to 100 g / 10 minutes and a density of 0.910 to 0.935 g / cm ³ ,
(C) An easy-cut laminating layer comprising: a high-density polyethylene having a melt flow rate of 1 to 100 g / 10 min and a density of 0.930 g / cm ³ or more; body. 2. The easy-cut laminate according to claim 1, wherein said base material is an easy-cut plastic material. 3. The method according to claim 1, wherein the base material comprises a layer made of an easily cut plastic material and plastic, metal foil, cellophane, paper,
At least one selected from the group consisting of nonwoven fabric and woven fabric
The easy-cut laminate according to claim 1 or 2, comprising a seed layer. 4. Polypropylene having a melt flow rate of 1 to 100 g / 10 min.
% By weight and (B) a melt flow rate of 1 to 100 g /
10 minutes, the density is 0.910 to 0.935 g / cm
10 to 50% by weight of branched low density polyethylene which is ^3.
And (C) a resin composition containing 10 to 50% by weight of a high-density polyethylene having a melt flow rate of 1 to 100 g / 10 min and a density of 0.930 g / cm ³ or more. A method for producing an easy-cut laminate, wherein ozone treatment is performed on the surface of the molten film of the resin composition on the side in contact with the base material. 5. The method according to claim 1, wherein the ozone treatment is performed in an amount of 0.01 to 1 g based on the surface area of the molten film of the resin composition on the side in contact with the base material.
The method for producing an easy-cut laminate according to claim 4, wherein the treatment is performed at an ozone treatment amount of / m ² .