JPH07119329B2 - High-speed extrusion molding resin composition and laminate molding method using this resin composition - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a resin composition for high-speed extrusion molding and a lamination molding method using the composition. More specifically, the present invention relates to a resin composition that is suitable for high-speed extrusion molding and is particularly excellent in so-called laminate physical properties such as lamination adhesion strength with aluminum, low-temperature heat-sealing property, and hot-tack property.

The present invention also relates to a laminate molding method in which extrusion laminating is performed using the resin composition as described above.

Technical background of the invention and its problems Conventionally, when a laminate is manufactured by extrusion laminating, it is excellent in so-called laminate physical properties such as lamination adhesive strength with aluminum, low-temperature heat-sealing property, hot tack property, and cost reduction and From the viewpoint of improving productivity, the advent of a resin composition suitable for high-speed extrusion molding has been desired.

In order to perform high-speed extrusion laminating, a resin composition excellent in spreadability, low temperature heat sealability, etc. is required.

Conventionally, an ethylene-α, β-unsaturated carboxylic acid copolymer has been disclosed in JP-A-60-106,814 as a low-temperature adhesive copolymer excellent in low-temperature heat-sealing property. A resin composition comprising an ethylene copolymer and an ionically crosslinked ethylene copolymer, which is excellent in heat-sealing property and as a material for extrusion lamination having good lamination adhesive strength, is disclosed in JP-A-58-199,144. There is.

The ethylene-α, β-unsaturated carboxylic acid copolymer disclosed in JP-A-60-106,814 is specifically
Acid content is 3-10% by weight and density is 0.920-0.950 g / cm
³ , the melt flow index (MFR) is 0.1 to 20 g / 10 minutes, and the value of the die swell (DSR) ratio n is within the range represented by the following equation.

1 ≦ n ≦ 2.17-0.33l nMFR Further, the resin composition disclosed in the above-mentioned JP-A-58-199,144 is specifically ethylene containing 5 to 10% by weight of acrylic acid and / or methacrylic acid. Copolymer [A]
100 parts by weight and 5 to 20% by weight of unsaturated carboxylic acid,
10% or more of the acid is composed of 1 to 5 parts by weight of an ethylene copolymer [B] neutralized with an ionic metal compound.

However, in the resin composition as described above, the property that high-speed film formation without film breakage, so-called high-speed thinning property, and the phenomenon that the edge of the melted film shrinks inward and the width of the film narrows, The balance with the neck-in was not always sufficient. In general, when the film formation speed is high, the film breakage easily occurs, while when the film formation speed is low, the production efficiency is deteriorated and the cost thereof is increased. In addition, when the film formation speed is increased, the edge of the melted film contracts inward, resulting in constriction, which increases the degree of so-called neck-in, resulting in a large film loss.

Therefore, the present inventors have excellent adhesive properties with aluminum, low-temperature heat-sealing properties, hot tack properties, and other so-called laminate physical properties, as well as excellent balance between high-speed thinning properties and neck-in, and resins suitable for high-speed extrusion molding. In order to obtain a composition, intensive studies have revealed that a specific ethylene-
In addition to α, β-unsaturated carboxylic acid copolymer, 50-500p
If the water content of pm is used as one component of the resin composition, the above-mentioned desired resin composition can be obtained.
Instead of α, β-unsaturated carboxylic acid copolymer, α, β
-It has been found that extrusion molding can be performed at a higher speed by using an ethylene-α, β-unsaturated carboxylic acid copolymer in which the metal ionization rate of unsaturated carboxylic acid is 1% or less, and the present invention is completed. I arrived.

OBJECT OF THE INVENTION The present invention is intended to solve the problems associated with the prior art as described above, and is excellent in so-called laminate physical properties such as lamination adhesion strength with aluminum, low temperature heat sealability, and hot tack property. It is an object of the present invention to provide a resin composition having an excellent balance between high-speed thinning property and neck-in, which is suitable for high-speed extrusion molding, and a lamination molding method using the resin composition.

SUMMARY OF THE INVENTION The first resin composition for high speed extrusion molding according to the present invention comprises α,
an ethylene-α, β-unsaturated carboxylic acid copolymer having a β-unsaturated carboxylic acid content of 1 to 6 mol%, a melt flow rate of 1 to 50 g / 10 minutes, and an expansion ratio of 60% or less, It is characterized by being composed of 50 to 500 ppm of water.

The second resin composition for high-speed extrusion molding according to the present invention has an α, β-unsaturated carboxylic acid content of 1 to 6 mol%, a melt flow rate of 1 to 50 g / 10 minutes, and an expansion ratio of It is composed of an ethylene-α, β-unsaturated carboxylic acid copolymer having a metal ion ratio of the α, β-unsaturated carboxylic acid of 75% or less and 1% or less, and a water content of 50 to 500 ppm. Is characterized by.

Further, the first and second laminate molding methods according to the present invention include performing extrusion lamination processing on at least one surface of a substrate using the first and second resin compositions according to the present invention, respectively. It has a feature.

Detailed Description of the Invention Hereinafter, the resin composition for high-speed extrusion molding according to the present invention and the lamination molding method using the resin composition will be specifically described.

First, the first resin composition for high-speed extrusion molding according to the present invention will be described.

The first resin composition for high-speed extrusion molding according to the present invention comprises an ethylene-α, β-unsaturated carboxylic acid copolymer and 50 to 500 ppm.
It is composed of water and.

The ethylene-α, β-unsaturated carboxylic acid copolymer constituting the first resin composition for high-speed extrusion molding according to the present invention is
1-6 mol% of α, β-unsaturated carboxylic acid, especially 1.5-
It is preferably present in an amount of 4.5 mol%.

The α, β-unsaturated carboxylic acid used in the present invention is an unsaturated carboxylic acid having 3 to 8 carbon atoms, specifically, acrylic acid, methacrylic acid, itaconic acid, maleic anhydride, maleic acid monomethyl ester, Maleic acid monoethyl ester or the like is used. Among these unsaturated carboxylic acids, acrylic acid and methacrylic acid are particularly preferably used.

The ethylene-α, β-unsaturated carboxylic acid copolymer used in the present invention may contain a third component in addition to ethylene and the unsaturated carboxylic acid as described above. As such, unsaturated carboxylic acid esters such as ethyl acrylate, isobutyl acrylate, n-butyl acrylate, and methyl methacrylate, and vinyl esters such as vinyl acetate are used.

Α in ethylene-α, β-unsaturated carboxylic acid copolymer
If the content of β-unsaturated carboxylic acid is less than 1 mol%, the effect of improving the adhesive strength to aluminum or the like and the low-temperature heat-sealing property becomes small, which is not preferable.
When the content of the α, β-unsaturated carboxylic acid exceeds 6 mol%, a problem occurs in the thermal stability during the extrusion coating process,
It is not preferable because it is difficult to balance the adhesive force to the substrate and the film stability.

Further, in the present invention, the melt flow rate (MFR) of the ethylene-α, β-unsaturated carboxylic acid copolymer is 1 to 5
It is 0 g / 10 minutes, preferably 4-35 g / 10 minutes. When the melt flow rate of the ethylene-α, β-unsaturated carboxylic acid copolymer is less than 1 g / 10 minutes, the moldability tends to be significantly decreased, which is not preferable, while 50 g /
If it exceeds 10 minutes, the melt viscosity of the copolymer becomes too low,
It is not preferable because film formation becomes difficult.

In the present invention, the melt flow rate is JIS
According to K-6760, it is measured under the condition of load 2160g and temperature 190 ℃.

Further, in the present invention, the expansion ratio of the ethylene-α, β-unsaturated carboxylic acid copolymer is 60% or less, preferably 40% or less.
The range is -60%, preferably 45-55%. Ethylene
When the expansion ratio of the α, β-unsaturated carboxylic acid copolymer exceeds 60%, the film formation stability at both ends of the film during molding is lowered and only low speed extrusion coating is possible, which is not preferable. The swelling ratio is obtained by measuring the diameter d of the portion 5 mm from the tip of the strand obtained under the above melt flow rate measurement conditions (measurement direction is changed by 90 degrees and the average value measured at two points) Ask by.

The ethylene-α, β unsaturated carboxylic acid copolymer having the above properties can be produced by adjusting the polymerization conditions.

The water content constituting the first resin composition for high speed extrusion molding according to the present invention is preferably present in an amount of 50 to 500 ppm, particularly 100 to 400 ppm. When the amount of water is less than 50 ppm, the high-speed thinning property is poor, which is not preferable, while when the amount of water exceeds 500 ppm, foaming tends to occur in the film, which is not preferable. The amount of the above water content is calculated as follows. That is, a fixed amount of sample is put into a predetermined sample tube and heated to 150 ° C. in a dry air flow to expel water in the sample, and this is absorbed in dehydrated methanol. The absorbed water content is quantified by the Karl Fischer method.

The first resin composition for high speed extrusion molding according to the present invention is, for example, radical polymerization of ethylene and α, β-unsaturated carboxylic acid under high temperature and high pressure according to a high pressure method which is a method for producing low density polyethylene. To obtain an ethylene-α, β-unsaturated carboxylic acid copolymer, and then using an extruder.
This copolymer is extruded into water and cut in water to form pellets, and then the pellets are mixed with a water content of 50-500 p
Obtained by drying to pm. Further, when it is overdried, it may be brought into contact with water to adjust its content. For example, a method of placing the resin in a high-humidity atmosphere, a method of adding water in an extruder to re-pelletize, a method of bringing the resin into contact with water again and drying until a predetermined water content is adopted, and the like. be able to.

Next, the second resin composition for high speed extrusion molding according to the present invention will be described.

The second resin composition for high-speed extrusion molding according to the present invention comprises α,
An ethylene-α, β-unsaturated carboxylic acid copolymer having a metal ionization ratio of β-unsaturated carboxylic acid of 1% or less, and 50-
It is composed of 500 ppm water.

Specific examples of the metal ion used in the metal ionization include K ⁺ , Na ⁺ , Li ⁺ , Zn ²⁺ , Co ²⁺ , Ni ²⁺ , Mn ²⁺ , P
^Examples thereof include b ²⁺ , Mg ²⁺ , Cu ²⁺ , Ca ²⁺ and Al ³⁺ . The metal ionization is usually performed after copolymerizing α, β-unsaturated carboxylic acid and ethylene.

In the present invention, the metal ionization rate of the α, β-unsaturated carboxylic acid in the ethylene-α, β-unsaturated carboxylic acid copolymer is 1% or less. If the metal ionization rate exceeds 1%, the hygroscopicity of the resin composition increases, and special consideration is required to maintain a preferable moisture range, which is not preferable.

The ionization rate can be calculated, for example, by analyzing the metal by atomic absorption spectrometry and quantifying the carboxyl group by titration.

Further, the content and type of the α, β-unsaturated carboxylic acid in the ethylene-α, β-unsaturated carboxylic acid copolymer constituting the second resin composition for high-speed extrusion molding according to the present invention, and its melt, The flow rate is the same as that of the ethylene-α, β-unsaturated carboxylic acid copolymer constituting the first resin composition for high speed extrusion molding according to the present invention.

The expansion ratio of the second resin composition for high-speed extrusion molding according to the present invention may be larger than that of the first resin composition according to the present invention, and α, β-in the copolymer The value is 75%, although it varies slightly depending on the type of unsaturated carboxylic acid.
Below, it is preferably 40 to 65%, more preferably 45 to 60%. The reason for defining the expansion ratio as described above is the same as the reason explained in the case of the first resin composition for high-speed extrusion molding.

In the resin composition of the present invention, if necessary, an antioxidant, a weather resistance stabilizer, an ultraviolet absorber, a tackifier, a wax, various fillers, etc. are blended within a range not impairing the object of the present invention. May be.

Next, the first and second laminated molding methods according to the present invention will be described.

In the first laminate molding method according to the present invention, the above-mentioned first resin composition for high-speed extrusion molding according to the present invention, that is, α,
an ethylene-α, β-unsaturated carboxylic acid copolymer having a β-unsaturated carboxylic acid content of 1 to 6 mol%, a melt flow rate of 1 to 50 g / 10 minutes, and an expansion ratio of 60% or less, 50-50
Extrusion lamination is performed on at least one surface of the substrate using a resin composition containing 0 ppm of water.

In the second laminate molding method according to the present invention, the content of the second resin composition for high-speed extrusion molding according to the present invention, that is, α, β-unsaturated carboxylic acid, is 1 to 6 mol%,
Ethylene-α, β-unsaturated carboxylic acid having a melt flow rate of 1 to 50 g / 10 minutes, an expansion ratio of 75% or less, and a metal ionization ratio of the α, β-unsaturated carboxylic acid of 1% or less. Extrusion laminating is performed on at least one surface of a substrate using a resin composition composed of a copolymer and a water content of 50 to 500 ppm.

The first and second high-speed extrusion molding compositions according to the present invention can be used as an adhesive layer or a heat-sealing layer by laminating on various base materials.

As the base material, specifically, aluminum (Al),
Metal substrates such as iron, copper, lead, zinc, nickel, tin, stainless steel, polyethylene (PE), polypropylene (P
P) such as polyolefin, polyethylene terephthalate (PET), polyester such as polybutylene terephthalate, polycarbonate, polyamide (PA), ethylene-vinyl alcohol copolymer, polyvinylidene chloride, polystyrene, polyacetal, epoxy resin, phenol resin Such plastic base materials, vapor-deposited plastic base materials in which metal is vapor-deposited on these plastics, or base materials such as cloth and paper can be mentioned.

In the present invention, not only a two-layer laminate of the first and second resin compositions (A) according to the present invention and the above-mentioned base material, but also, for example,
Al / (A) / PET, Al / (A) / glass, (A) / Al /
(A), (A) / PA / (A), PA / PE / (A), biaxially stretched PP
/ (A) / deposition unstretched PP, (A) / Al / (A) 3
Layered laminate, and further paper / (A) / Al / (A), PET / PE / Al /
It may be a laminate of four or more layers such as (A) and paper / (A) / Al / (A) / PE.

In addition, an adhesive may be interposed between the base material and the composition layer for high-speed extrusion molding according to the present invention in the above-mentioned lamination.
Therefore, the composition can be laminated with the base material to which the adhesive has been applied in advance.

In the present invention, as a device for high-speed extrusion molding, a conventionally known laminator, such as a T-die film extruder, a pressure roll, a cooling roll, a trimming machine, and a laminator configured by a winder, can be used.

In the first laminate molding method according to the present invention, as described above, ethylene-α, whose melt flow rate, expansion ratio and α, β-unsaturated carboxylic acid content are within a specific range.
Since a resin composition consisting of a β-unsaturated carboxylic acid copolymer and water of 50 to 500 ppm is used, the film formation rate of this resin composition should be increased to about 150 to 300 m / min at a film thickness of 20 μm. You can Therefore, in the present invention, extrusion laminating can be performed at a higher speed than conventional extrusion laminating.

In addition, in the second laminated molding method according to the present invention, α, β-
An ethylene-α, β-unsaturated carboxylic acid copolymer in which the metal ionization rate of the unsaturated carboxylic acid is 1% or less;
Since the resin composition composed of 0 ppm of water is used, the film formation rate of this resin composition can be increased to about 250 to 500 m / min at a film thickness of 20 μm. Therefore, in the second laminate molding method according to the present invention, the extrusion laminate processing can be performed at a higher speed than the extrusion laminate processing in the first laminate molding method.

EFFECT OF THE INVENTION The first resin composition for high speed extrusion molding according to the present invention comprises α,
an ethylene-α, β-unsaturated carboxylic acid copolymer having a β-unsaturated carboxylic acid content of 1 to 6 mol%, a melt flow rate of 1 to 50 g / 10 minutes, and an expansion ratio of 60% or less, 50-50
The second resin composition for high-speed extrusion molding according to the present invention has an α, β-unsaturated carboxylic acid content of 1 to 6 mol%, and a melt flow rate of 1 to 1.
50 g / 10 min, ethylene-α, β-unsaturated carboxylic acid copolymer having a swelling ratio of 75% or less and a metal ionization ratio of the α, β-unsaturated carboxylic acid of 1% or less, ~ 500p
Compared with conventional resin compositions, it has a good film appearance and a good balance of high-speed thinning property and neck-in, and is suitable for high-speed extrusion molding, and especially laminated with aluminum. It has excellent so-called laminate physical properties such as adhesive strength, low temperature heat sealability, and hot tack.

Further, in the first and second laminate molding methods according to the present invention, since the resin composition according to the present invention is used to perform extrusion lamination processing on at least one surface of the substrate, the conventional resin composition is not used. It can be laminated at a higher speed than the case where it is used.

Hereinafter, the present invention will be described with reference to examples, but the present invention is not limited to these examples.

First, the high-speed thin-pullability at the time of extrusion lamination of the resin composition for high-speed extrusion molding according to the present invention and a substrate, the adhesive strength between the resin composition and an aluminum foil, the low-temperature heat-sealing property of the laminate, and the hot A method for evaluating tackiness will be described.

(1) High-speed thin drawability during extrusion lamination Molding machine: Laminator with 65 mm diameter (L / D = 32) Die: Inner deckle die Effective width of die: 800 mm Die opening: 0.8 x 500 mm Air gap: 110 mm Molding temperature: 290 ℃ (directly below the die) Resin extrusion rate: 750g / min (take-off speed 80m / min × laminated resin thickness)
20 μm equivalent amount) Collection speed: 80 m / min Base material: Kraft paper (50 g / m ² ) Under the above conditions, the base material was sent out from one side, and the melted resin composition for evaluation was extruded and laminated in the form of a film. The resin coat width (Lmm) of the obtained laminate is measured. The difference between the die opening length (500 mm) and the resin coat width (Lmm) at this time is the neck-in. The high-speed thinning property was evaluated by the following two measuring methods.

In the measurement method-1, while keeping the resin extrusion rate (750 g / min) under the extrusion lamination conditions constant, the take-up speed was 80 m / min.
Then, gradually increase the value, and measure the take-up speed when the resin film starts to break, and set this as DD-1. Further, in the measurement method-2, while keeping the resin coat thickness (20 μm) under the above-mentioned extrusion lamination conditions constant, the take-up speed was gradually increased from 80 m / min while increasing the resin extrusion amount, and the resin film Measure the take-off speed at the time when the cut begins to occur and
D-2.

(2) Adhesive strength between resin composition and aluminum foil The base material is kraft paper (50 g / m ² ) and aluminum foil (9 μm).
m), 20 μm thick low density polyethylene (LDPE)
Are laminated by extrusion lamination. An evaluation resin is extrusion-laminated on both sides of aluminum of this product under the condition of (1) above so as to have a coat thickness of 20 μm. The adhesive strength between the resin and the aluminum foil of this laminate was determined by producing 10 test pieces with a length of 150 mm and a width of 15 mm from the laminate, and for each test piece, under an atmosphere of 23 ° C. and 50% RH. The maximum value when peeling at 90 ° with a tensile strength of 300 mm / min was measured, and the average value of 10 test pieces was evaluated.

(3) Low-temperature heat-sealing property With respect to the laminate obtained by the method of (2) above, the laminated resin surfaces were heat-sealed at respective temperatures of 110 to 160 ° C.

For heat sealing, use a single-sided heating plate type heat sealer,
Heat seal conditions are seal width 10mm, seal pressure 2kg / cm.
² , seal time 0.5sec, seal bar 30cm × 10mm,
15mm wide and 15mm long from heat-sealed laminate under these conditions
Ten cm test pieces were prepared.

The heat seal strength of 10 test pieces was measured by the peel strength measuring method described in (2) above.

(4) Hot tack property The laminate obtained by the method of (1) above is 4 cm wide and 63 cm long.
And the size is used as a test piece. Hereinafter, the hot tack evaluation method will be described with reference to FIG. FIG. 1 is a schematic view of a measuring instrument used for hot tack evaluation. In the figure, 1 and 2 are heat seal plates of the heat sealer used in the low temperature heat sealability evaluation of the above (3), only the upper side 1 is heated to a predetermined temperature, and the lower side 2 is room temperature. 3 is the above-mentioned test piece, and the coated resin surfaces which are the heat seal layers face each other. A 45 g weight 4 is attached to the right end portions of both test pieces, and the position of the left end portion 6 is fixed. There is an angle of 22.5 ° at the position. The heat seal plates 1 and 2 have a length of 30 cm and a width of 10 mm. The test piece 3 is heat-sealed under the same conditions as the heat-sealing (3) described above in the state as shown in FIG. 1, and at that moment, the fixation of 6 is released and the heat-sealing surface is forcibly peeled by the weight. Peel off with (90g). The peel distance of the heat-sealed surface at that time was measured and the value was used to evaluate the hot tack property.

Example 1 Ethylene having a melt flow rate of 8 g / 10 min, a methacrylic acid content of 3.1 mol% and an expansion ratio of 54%
A resin composition consisting of a methacrylic acid copolymer (E / MAA) and 210 ppm of water is used as a resin composition for extrusion coating, and high-speed thin-pullability at the time of extrusion lamination of this resin composition and aluminum foil The adhesive strength, the low temperature heat sealability and the hot tack property were evaluated according to the evaluation methods (1) to (4).

The results are shown in Table 1.

Comparative Example 1 Ethylene having a melt flow rate of 8 g / 10 min, a methacrylic acid content of 3.1 mol% and an expansion ratio of 63%
A resin composition consisting of a methacrylic acid copolymer (E / MAA) and 120 ppm of water was used as a resin composition for extrusion coating, and the high-speed thinning property at the time of extrusion lamination of this resin composition was determined by ) Was evaluated according to the evaluation method.

The results are shown in Table 1.

Comparative Example 2 Ethylene having a melt flow rate of 8 g / 10 min, a methacrylic acid content of 3.1 mol% and an expansion ratio of 60%
A resin composition comprising a methacrylic acid copolymer (E / MAA) and a water content of 30 ppm was used as a resin composition for extrusion coating, and the high-speed thinning property at the time of extrusion lamination of this resin composition was determined by the above (1). ) Was evaluated according to the evaluation method.

The results are shown in Table 1.

Example 2 Ethylene having a melt flow rate of 8 g / 10 min, a methacrylic acid content of 3.1 mol% and an expansion ratio of 50%
A resin composition consisting of a methacrylic acid copolymer (E / MAA) and 200 ppm of water is used as a resin composition for extrusion coating, and high-speed thin-pullability at the time of extrusion lamination of this resin composition, The adhesive strength, the low temperature heat sealability and the hot tack property were evaluated according to the evaluation methods (1) to (4).

The results are shown in Table 1.

Example 3 Ethylene having a melt flow rate of 8 g / 10 min, a methacrylic acid content of 3.1 mol% and an expansion ratio of 43%
A resin composition consisting of a methacrylic acid copolymer (E / MAA) and 200 ppm of water was used as a resin composition for extrusion coating, and the high-speed thinning property at the time of extrusion lamination of this resin composition was determined by the above (1). ) Was evaluated according to the evaluation method.

The results are shown in Table 1.

Example 4 From an ethylene / acrylic acid copolymer (E / MAA) having a melt flow rate of 9 g / 10 min, an acrylic acid content of 3.4 mol% and an expansion ratio of 40%, and 230 ppm of water. Is used as a resin composition for extrusion coating, and the high-speed thinness of the resin composition at the time of extrusion lamination, the adhesive strength with an aluminum foil, the low-temperature heat-sealing property, and the hot-tack property are obtained according to the above (1). It evaluated according to the evaluation method of- (4).

The results are shown in Table 1.

Comparative Example 3 Ethylene having a melt flow rate of 8 g / 10 min, a methacrylic acid content of 0.7 mol% and an expansion ratio of 54%
A resin composition consisting of a methacrylic acid copolymer (E / MAA) and 90 ppm of water was used as a resin composition for extrusion coating, and high-speed thin-pullability at the time of extrusion lamination of this resin composition,
The adhesive strength with the aluminum foil, the low-temperature heat-sealing property, and the hot tack property were evaluated according to the evaluation methods (1) to (4).

The results are shown in Table 1.

Example 5 Ethylene having a melt flow rate of 7 g / 10 min, a methacrylic acid content of 1.3 mol% and an expansion ratio of 58%
A resin composition comprising a methacrylic acid copolymer (E / MAA) and a water content of 150 ppm was used as a resin composition for extrusion coating, and the high-speed thin drawability during extrusion lamination of this resin composition The adhesive strength, the low temperature heat sealability and the hot tack property were evaluated according to the evaluation methods (1) to (4).

The results are shown in Table 1.

Example 6 Ethylene having a melt flow rate of 8 g / 10 min, a methacrylic acid content of 3.9 mol% and an expansion ratio of 57%
A resin composition consisting of a methacrylic acid copolymer (E / MAA) and a water content of 230 ppm is used as a resin composition for extrusion coating, and high-speed thin-pullability at the time of extrusion lamination of this resin composition and an aluminum foil The adhesive strength, the low temperature heat sealability and the hot tack property were evaluated according to the evaluation methods (1) to (4).

The results are shown in Table 1.

Example 7 An ethylene / methacrylic acid copolymer having a melt flow rate of 8 g / 10 min, a methacrylic acid content of 3.1 mol%, a swelling ratio of 53%, and an ionization rate with zinc of 0.3%, A resin composition comprising water of 250 ppm is used as a resin composition for extrusion coating, high-speed thin-pullability during extrusion lamination of this resin composition, adhesive strength with an aluminum foil,
The low-temperature heat-sealing property and the hot tack property were evaluated according to the evaluation methods (1) to (4).

The results are shown in Table 1.

Example 8 An ethylene / methacrylic acid copolymer having a melt flow rate of 8 g / 10 min, a methacrylic acid content of 3.1 mol%, a swelling ratio of 54%, and an ionization rate with zinc of 0.5%, A resin composition comprising water of 300 ppm is used as a resin composition for extrusion coating, high-speed thin-pullability at the time of extrusion lamination of this resin composition, adhesive strength with an aluminum foil,
The low-temperature heat-sealing property and the hot tack property were evaluated according to the evaluation methods (1) to (4).

The results are shown in Table 1.

Example 9 An ethylene / methacrylic acid copolymer having a melt flow rate of 8 g / 10 min, a methacrylic acid content of 3.1 mol%, a swelling ratio of 54%, and an ionization rate with zinc of 0.7%, A resin composition having a water content of 190 ppm was used as a resin composition for extrusion coating, and the high-speed thin-pullability of this resin composition during extrusion lamination was evaluated according to the evaluation method of (1) above.

The results are shown in Table 1.

Comparative Example 4 An ethylene / methacrylic acid copolymer having a melt flow rate of 8 g / 10 min, a methacrylic acid content of 3.1 mol%, a swelling ratio of 59%, and an ionization rate with zinc of 2.7%. A resin composition containing 650 ppm of water was used as a resin composition for extrusion coating, and the high-speed thinning property during extrusion lamination of this resin composition was evaluated according to the evaluation method of (1) above. Foaming based on water was not possible to carry out the evaluation remarkably.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a test method of hot tack property. 1,2 …… Heat seal plate 3 …… Test piece 4 …… Weight

Claims (4)

[Claims] 1. The content of α, β-unsaturated carboxylic acid is 1 to
6 mol%, melt flow rate 1 to 50 g / 10 minutes, expansion ratio
A resin composition for high-speed extrusion molding, which comprises 60% or less of an ethylene-α, β-unsaturated carboxylic acid copolymer and 50 to 500 ppm of water. 2. The content of α, β-unsaturated carboxylic acid is 1 to 1.
6 mol%, melt flow rate 1 to 50 g / 10 minutes, expansion ratio
It is composed of an ethylene-α, β-unsaturated carboxylic acid copolymer having a metal ionization ratio of the α, β-unsaturated carboxylic acid of 75% or less and 1% or less, and a water content of 50 to 500 ppm. A resin composition for high-speed extrusion molding, which comprises: 3. A laminate molding method which comprises subjecting at least one surface of a substrate to extrusion lamination using the resin composition for high speed extrusion molding according to claim 1. 4. A laminate molding method, which comprises subjecting at least one surface of a base material to extrusion lamination using the resin composition for high-speed extrusion molding according to claim 2.