WO2014196278A1 - ポリエチレン系樹脂多層発泡シート及びガラス板用間紙 - Google Patents
ポリエチレン系樹脂多層発泡シート及びガラス板用間紙 Download PDFInfo
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- WO2014196278A1 WO2014196278A1 PCT/JP2014/061010 JP2014061010W WO2014196278A1 WO 2014196278 A1 WO2014196278 A1 WO 2014196278A1 JP 2014061010 W JP2014061010 W JP 2014061010W WO 2014196278 A1 WO2014196278 A1 WO 2014196278A1
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- polyethylene resin
- polyethylene
- layer
- resin
- sheet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/065—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
- C08J9/14—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
- C08J9/141—Hydrocarbons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
- B32B2307/21—Anti-static
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/56—Damping, energy absorption
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2213/00—Safety means
- B65D2213/02—Means for preventing buil-up of electrostatic charges
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2201/00—Foams characterised by the foaming process
- C08J2201/02—Foams characterised by the foaming process characterised by mechanical pre- or post-treatments
- C08J2201/03—Extrusion of the foamable blend
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/14—Saturated hydrocarbons, e.g. butane; Unspecified hydrocarbons
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/06—Polyethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2447/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds; Derivatives of such polymers
Definitions
- the present invention relates to a polyethylene-based resin multilayer foamed sheet and its use as an interleaf for glass plates.
- polyethylene-based resin foam sheets have been used as materials for cushioning materials and packaging materials.
- a polyethylene-based resin foam sheet having antistatic properties has been used as a suitable material as a packaging material because it is difficult to damage dust and is flexible because it is difficult to dust.
- polyethylene-based resin foam sheets having antistatic properties have been used in the packaging field of electronic devices and their materials, such as being used for slip sheets such as glass plates for liquid crystal panels.
- liquid crystal panel glass plate If the liquid crystal panel glass plate is contaminated by the migration of organic substances contained in the foamed sheet, it will lead to failure and deterioration of production yield when an electronic circuit is formed on the glass plate. It is required to reduce the migration of substances and the like.
- Japanese Patent Application Laid-Open No. 2005-194433 discloses a polyethylene resin foam sheet in which a polymer type antistatic agent is blended as an antistatic agent.
- Japanese Patent Application Laid-Open No. 2004-181933 discloses a polyethylene resin multilayer foam sheet in which a polymer type antistatic agent is blended in a surface layer laminated on a foam layer. The foamed sheet using these polymer-type antistatic agents has a greatly reduced amount of migration of organic substances and the like to the package as compared with a foamed sheet using a conventional surfactant.
- the polyethylene-based resin foam sheet using the polymer type antistatic agent as described above has a good antistatic property and a low degree of contamination due to migration, so that it can be used as a suitable packaging material for an electronic device or its material. Used as paper.
- the low molecular weight component contained in the polymer type antistatic agent itself may migrate to the package, and the polyethylene constituting the foam sheet It has been found that low molecular weight components contained in the base resin itself may migrate.
- the present invention has been made in view of the above problems, and an object thereof is to provide a polyethylene-based resin multilayer foamed sheet having an antistatic performance and a very small amount of low molecular weight components transferred to a package. It is what.
- a foamed layer forming molten resin obtained by kneading a polyethylene resin (A), a polymer antistatic agent and a physical foaming agent, and a polyethylene resin (B) are kneaded.
- Both the polyethylene resin (A) and the polyethylene resin (B) are polyethylene resins having an n-heptane extraction amount at 50 ° C.
- the blending amount of the polymer antistatic agent in the foamed layer is 3 to 15% by weight with respect to 100% by weight in total of the polyethylene resin (A) and the polymer antistatic agent,
- a polyethylene-based resin multilayer foamed sheet characterized in that the thickness of the surface layer is 2 to 10 ⁇ m is provided.
- the present invention provides the polyethylene-based resin multilayer foam sheet according to the first aspect, characterized in that the surface resistivity of the multilayer foam sheet on the surface layer side is less than 1 ⁇ 10 14 ⁇ . To do.
- the present invention provides the polyethylene-based resin multilayer foam sheet according to the first or second aspect, wherein the apparent density of the multilayer foam sheet is 15 to 300 kg / m 3 .
- the present invention provides a glass sheet interleaf made of the polyethylene resin multilayer foamed sheet of any of the first to third aspects.
- the polyethylene-based resin multilayer foamed sheet of the present invention (hereinafter also simply referred to as a foamed sheet or a multilayer foamed sheet) is laminated on at least one surface of a polyethylene-based resin foamed layer (hereinafter also simply referred to as a foamed layer). And a polyethylene-based resin surface layer (hereinafter also simply referred to as a surface layer).
- a polyethylene resin (A) constituting the foam layer and the polyethylene resin (B) constituting the surface layer a polyethylene resin having a heptane extraction amount at 50 ° C. of 0.5% by weight or less is used.
- the polymer type antistatic agent is present in the foamed layer in an amount of 3 to 15% by weight based on 100% by weight of the total of the polyethylene resin (A) and the polymer type antistatic agent.
- the thickness of the surface layer is 2 to 10 ⁇ m.
- the foamed sheet of the present invention has a multilayer structure in which a surface layer is laminated on at least one surface of a foamed layer, and is formed with a foamed layer comprising a polyethylene resin (A), a polymer antistatic agent, and a physical foaming agent. It is obtained by coextrusion of the first melt for forming and the second melt for forming the surface layer composed of the polyethylene resin (B).
- the first melt is heated, kneaded by supplying an additive such as a polyethylene-based resin (A), a polymer-type antistatic agent, and a cell regulator added as necessary to an extruder.
- the second melt is obtained by heating, kneading and melting the polyethylene resin (B).
- the foam sheet is obtained by introducing the first and second melts into a coextrusion die, merging and laminating, and coextrusion.
- the surface layer may be laminated
- Each of the polyethylene resin (A) and the polyethylene resin (B) has a heptane extraction amount at 50 ° C. of 0.5% by weight or less.
- the content of the polymer antistatic agent in the foamed layer is 3 to 15% by weight based on the total of 100% by weight of the polyethylene resin (A) and the polymer antistatic agent,
- the thickness is 2 to 10 ⁇ m.
- the organic substance such as a low molecular weight component usually inevitably contained in the molecular type antistatic agent is prevented from bleeding out to the surface of the foam sheet, thereby suppressing the organic substance from being transferred to the package.
- the amount of the polymer antistatic agent relative to the polyethylene resin (A) does not substantially change before and after the coextrusion. Therefore, in the first melt for forming the foam layer, the polymer antistatic agent is When blended in an amount of 3 to 15% by weight based on 100% by weight of the total amount of the polyethylene resin (A) and the polymer antistatic agent, the polymer antistatic agent is added to the polyethylene foam in the formed foamed layer. 3 to 15% by weight is present with respect to 100% by weight of the total of the resin (A) and the polymer antistatic agent.
- the polyethylene-based resin (B) used in the surface layer has an ethylene component unit content of 50 mol% or more in the resin.
- Specific examples thereof include low-density polyethylene (PE-LD), linear Low density polyethylene (PE-LLD), high density polyethylene (PE-HD), ethylene-vinyl acetate copolymer (EVAC), ethylene-methyl methacrylate copolymer (EMMA), ethylene-ethyl acrylate copolymer (EEAK) and mixtures thereof.
- low-density polyethylene, long chain density having a branched structure is a polyethylene resin of less than 910 kg / m 3 or more 930 kg / m 3
- linear low density polyethylene, ethylene and number from 4 to 8 carbon atoms a polyethylene resin density copolymer is a substantially molecular chain is linear is less than 910 kg / m 3 or more 930 kg / m 3 and ⁇ - olefin
- high density polyethylene has a density of 930 kg / m
- these polyethylene resins are preferably used.
- low density polyethylene is particularly preferable from the viewpoint of buffering properties.
- the polyethylene resin (B) and further the polyethylene resin (A) require that the amount of heptane extracted at 50 ° C. is 0.5% by weight or less. Since both the polyethylene resin (A) and the polyethylene resin (B) have a heptane extraction amount of 0.5% by weight or less, they are covered with organic matter such as low molecular weight components contained in the polyethylene resin itself. It becomes a foamed sheet with a small amount of transfer to a product. In addition, since a part of the low molecular weight component derived from the polyethylene resin (A) is transferred to the resin melt of the polyethylene resin (B) constituting the surface layer during coextrusion, the low molecular weight component is packaged.
- the amount of heptane extracted is preferably 0.4% by weight or less, more preferably 0.3% by weight or less, and particularly preferably 0.2% by weight or less.
- Examples of the polyethylene resin having a heptane extraction amount of 0.5 wt% or less include those obtained by extracting and removing low molecular weight components from the polyethylene resin with a solvent such as heptane. Moreover, what is manufactured using the slurry method and the solution method among the said polyethylene-type resin is mentioned. Polyethylene resins produced by the slurry method or solution method have low molecular weight components removed in the solvent removal process at the time of production, and extraction and removal treatment with a solvent such as heptane is not necessary. preferable.
- the amount of heptane extracted from the polyethylene resin is determined as follows. Crush the polyethylene resin pellets. About 2 g of the pulverized 200 mesh pass sample is weighed. This is put into a flask, 400 ml of normal heptane is added, and the mixture is heated to reflux at 50 ° C. for 48 hours. The resulting solution is filtered and the solvent is removed from the fractionated residue under heating vacuum. The difference between the weight of the obtained residue and the weight of the added polyethylene resin is determined. The amount of n-heptane extracted is weight% based on the amount of polyethylene resin charged with this difference.
- the melt mass flow rate (MFR) measured based on the condition D of JIS K7210-1999 is 1 to 30 g / It is preferably 10 minutes.
- the content is more preferably 1.5 to 20 g / 10 minutes, and further preferably 2 to 15 g / 10 minutes.
- the surface layer may not contain a polymer antistatic agent.
- a polymer antistatic agent may be blended in the surface layer. The amount is approximately 1% by weight or less in the surface layer. Thereby, the transfer of the organic substance from the polymer type antistatic agent to the package is suppressed to a low level.
- Examples of the polyethylene resin (A) used for the foam layer include the same as the polyethylene resin (B). However, the polyethylene resin (A) and the polyethylene resin (B) may be different resins.
- the polyethylene resin (A) among the above-mentioned polyethylene resins, those having a melt tension at 190 ° C. of 20 mN to 400 mN are preferable.
- the melt tension at 190 ° C. is preferably 20 mN or more, more preferably 30 mN or more, and further preferably 40 mN or more.
- the melt tension at 190 ° C. is preferably 400 mN or less, more preferably 300 mN or less, and further preferably 250 mN or less.
- the melt tension can be measured by, for example, a capillograph 1D manufactured by Toyo Seiki Seisakusho Co., Ltd. Specifically, a cylinder with a cylinder diameter of 9.55 mm and a length of 350 mm and an orifice with a nozzle diameter of 2.095 mm and a length of 8.0 mm were used. Place in the cylinder and let stand for 4 minutes, then push the molten resin out of the orifice into a string with a piston speed of 10 mm / min, put this string on a 45 mm diameter tension detection pulley, and take it off in 4 minutes.
- a capillograph 1D manufactured by Toyo Seiki Seisakusho Co., Ltd. Specifically, a cylinder with a cylinder diameter of 9.55 mm and a length of 350 mm and an orifice with a nozzle diameter of 2.095 mm and a length of 8.0 mm were used. Place in the cylinder and let stand for 4 minutes, then push the molten resin out of
- the take-up speed While increasing the take-up speed at a constant speed so that the speed reaches from 0 m / min to 200 m / min, the maximum value of the tension immediately before the string-like object breaks when the string-like object is taken up by the take-off roller. obtain.
- the reason why the time until the take-up speed reaches 0 m / min to 200 m / min is set to 4 minutes is to suppress the thermal deterioration of the resin and increase the reproducibility of the obtained value.
- melt tension (cN).
- the melt tension obtained by setting the take-up speed to a constant speed of 200 m / min is adopted.
- the molten resin is extruded into a string from the orifice, and this string is put on a tension detection pulley, and a constant speed increase is made so that the speed reaches 0 m / min to 200 m / min in 4 minutes. Rotate the take-up roller while increasing the take-up speed, and wait until the rotation speed reaches 200 m / min.
- the data acquisition of the melt tension is started, and the data acquisition is finished after 30 seconds.
- the average value (Tave) of the tension maximum value (Tmax) and the tension minimum value (Tmin) obtained from the tension load curve obtained during this 30 seconds is taken as the melt tension in the method of the present invention.
- the Tmax is a value obtained by dividing the total value of detected peak (peak) values in the tension load curve by the detected number
- the Tmin is detected in the tension load curve. It is a value obtained by dividing the total value of the dip (valley) values by the detected number.
- the polymer type antistatic agent is blended in the polyethylene resin (A) constituting the foam layer.
- the blending amount is 3 to 15% by weight with respect to 100% by weight in total of the polyethylene resin (A) and the polymer antistatic agent. If the amount of the polymeric antistatic agent is too large, the low molecular weight component may pass through the surface layer and migrate to the package.
- the blending amount of the polymer type antistatic agent is preferably as small as possible within the range where the antistatic performance is expressed. In the case where a polymer type antistatic agent is blended in the foamed layer, the same antistatic effect can be obtained even in a smaller blending amount than in the case of blending in the non-foamed layer.
- the reason for this is that if a polymer type antistatic agent is blended in the foam layer, the polymer type antistatic agent is not only stretched when the foam is widened and taken out, but is also extruded from the die. Even when foaming, the polymer antistatic agent is stretched, and it is considered that the polymer antistatic agent forms a more complicated network structure in the polyethylene resin.
- the upper limit of the amount of the polymeric antistatic agent is preferably 12% by weight, and more preferably 10% by weight.
- the amount of the polymeric antistatic agent is too small, there is a possibility that sufficient antistatic performance cannot be obtained.
- the lower limit of the amount of the polymeric antistatic agent is preferably 4% by weight.
- the polymer antistatic agent examples include a hydrophilic polymer having a volume resistivity of 1 ⁇ 10 5 to 1 ⁇ 10 11 ⁇ ⁇ cm (hereinafter also simply referred to as a hydrophilic polymer), and a hydrophilic polymer.
- examples include block polymers of block and hydrophobic polymer blocks, ionomers, and the like.
- Examples of the hydrophilic polymer include polyether, cationic polymer, anionic polymer and the like.
- Examples of the hydrophilic polymer block include the hydrophilic polymer block, and examples of the hydrophobic polymer block include polyolefin and polyamide.
- Examples of the bond between the hydrophilic polymer block and the hydrophobic polymer block include an ester bond, an amide bond, and an ether bond.
- the amount of the polymer type antistatic agent for obtaining a desired antistatic effect can be reduced, the amount of migration of the organic matter can be reduced, so that the surface resistivity is preferably 1 ⁇ 10 7 ⁇ or less.
- the thickness of the surface layer is required to be 2 to 10 ⁇ m.
- the thickness is smaller than 2 ⁇ m, the migration of the low molecular weight component derived from the polymer antistatic agent contained in the foam layer cannot be suppressed by the surface layer. If it is larger than 10 ⁇ m, the distance between the foam layer containing the antistatic agent and the surface of the surface layer becomes large, and it becomes difficult to neutralize the charge generated on the surface layer surface. It becomes difficult to do.
- the thickness of the surface layer can be adjusted by adjusting the discharge amount and the take-up speed.
- the thickness of the foamed sheet of the present invention is preferably 10 mm or less, more preferably 8 mm or less from the viewpoint of easy handling when packing an article to be packaged when the foamed sheet is used as a packaging material or an interleaf. 5 mm or less is further preferable, and 2 mm or less is particularly preferable. On the other hand, the thickness is preferably 0.05 mm or more, and more preferably 0.1 mm or more from the viewpoint of obtaining sufficient buffering properties when the multilayer foamed sheet is used particularly for applications requiring buffering properties.
- the method for measuring the thickness of the surface layer and the thickness of the foamed sheet is as follows. First, a foam sheet is cut
- the thickness [ ⁇ m] of the surface layer is determined by the surface layer discharge amount X [kg / hour] and the width W [m] of the foam sheet obtained when the foamed sheet is manufactured.
- the density ⁇ [g / cm 3 ] of the polyethylene resin constituting the surface layer is used to Can be obtained.
- Surface layer thickness [ ⁇ m] [1000 ⁇ X / (L ⁇ W ⁇ ⁇ )] (1)
- the apparent density of the foamed sheet of the present invention is preferably 15 to 300 kg / m 3 .
- the apparent density of the foamed sheet is in the above range, the balance between strength and buffering properties is excellent.
- ⁇ seat Density From this point of view is more preferably 18 kg / m 3 or more, 20 kg / m 3 or more, and on the other hand, ⁇ seat density is more preferably less than 300 kg / m 3, more preferably 250 kg / m 3 or less, 200 kg / m 3 or less is particularly preferable.
- the method for measuring the apparent density of the foam sheet is as follows. First, the thickness of the foam sheet is measured by the method described above. Next, in order to measure the basis weight, a test piece of (full width of foam sheet) ⁇ (length in extrusion direction 10 cm) ⁇ (thickness of multilayer foam sheet) is cut out from the foam sheet, and the mass [g] of the test piece is measured. To do.
- the basis weight [g / m 2 ] can be obtained by dividing the mass by the area of the test piece [m 2 : full width of foam sheet (m) ⁇ 0.1 m].
- the apparent density [kg / m 3 ] of the foam sheet can be obtained by dividing the calculated basis weight [g / m 2 ] by the thickness [mm] of the foam sheet and converting the unit.
- the closed cell ratio is preferably 10% or more, more preferably 20% or more.
- the closed cell ratio: S (%) of the polyethylene resin foam sheet is measured using an air comparison type hydrometer 930 type manufactured by Toshiba Beckman Co., Ltd. in accordance with Procedure C described in ASTM D2856-70.
- the actual volume of the foamed sheet (the sum of the volume of the closed cells and the volume of the resin part): Vx (L) can be obtained by calculation according to the following equation (2).
- Va, W, and ⁇ in the above equation (2) are as follows.
- Va Apparent volume of foam sheet used for measurement (cm 3 )
- W Mass of the foam sheet in the test piece (g)
- ⁇ Density of resin constituting the foam sheet (g / cm 3 )
- the foamed sheet of the present invention has antistatic properties.
- the half-life of the initial voltage on the surface layer side is preferably 60 seconds or less, more preferably 30 seconds or less. .
- the half-life is a value measured according to A method (half-life measurement method) of JIS L1094-1988. Specifically, a test piece cut out from a foam sheet (length 40 mm ⁇ width 40 mm ⁇ thickness: thickness of foam sheet to be measured) was left in an atmosphere at a temperature of 23 ° C. and a relative humidity of 50% for 36 hours. Adjust the condition.
- the turntable rotation speed is 1300 rpm, and after applying for 30 seconds under the condition of (+) 10 kV or ( ⁇ ) 10 kV, the application is stopped and the application is stopped. From the time until the initial charging voltage is attenuated to 1/2, the half-life (second) is obtained.
- the initial charging voltage is preferably within ⁇ 2.0 kV, more preferably within ⁇ 1.5 kV.
- the surface resistivity on the surface layer side is preferably less than 1 ⁇ 10 14 ⁇ , and 1 ⁇ 10 8 to 1 More preferably, it is ⁇ 10 13 ( ⁇ ).
- the surface resistivity of the foamed sheet is a value measured according to JIS K6271 (2001). That is, the state of the test piece is adjusted by leaving the test piece cut out from the foamed sheet (length 100 mm ⁇ width 100 mm ⁇ thickness: thickness of the foamed sheet) in an atmosphere at a temperature of 23 ° C. and a relative humidity of 50% for 24 hours. Next, under the condition of an applied voltage of 500 V, voltage application is started on the surface layer side of the test piece, and the surface resistivity after 1 minute is measured.
- the laminated foam sheet of the present invention is produced by laminating a polyethylene resin surface layer on one or both sides of a polyethylene resin foam layer containing a polymer type antistatic agent by a coextrusion method. Specifically, a coextrusion die is attached to the outlet of the foam layer forming extruder, and a device in which the surface layer forming extruder is connected to the coextrusion die, in the coextrusion die, A foam sheet is produced by joining the first melt for forming the foam layer and the second melt for forming the surface layer and then performing extrusion foaming.
- the polyethylene-based resin (A), a polymeric antistatic agent, and additives such as an air-conditioning agent blended as necessary are supplied to a foaming layer forming extruder, heated and kneaded, and then physically added.
- a foaming agent is press-fitted into a first melt.
- the polyethylene resin (B) is supplied to a surface layer forming extruder, heated and kneaded to obtain a second melt.
- the first melt is cooled to the proper foaming temperature
- the second melt is cooled as close as possible to the proper foaming temperature of the foam layer, and both are introduced into the coextrusion die.
- the first melt and the second melt are merged, the second melt is laminated on at least one side of the first melt, and co-extrusion is performed to take out the first melt while foaming.
- a foamed sheet is obtained by forming a surface layer on the surface.
- a method of coextrusion into a sheet shape using a flat die for coextrusion, a coextrusion using an annular die for coextrusion to form a cylindrical foam for example, there is a method of cutting a tubular foamed body along a columnar widening device while opening the tubular foamed material to obtain a sheet-like foamed sheet.
- a method using an annular die for coextrusion is a preferable method because generation of a wavy pattern called a corrugate can be suppressed and the heat shrinkage rate of the foamed sheet can be controlled within a preferable range.
- dye, a cylindrical widening apparatus, the apparatus which opens a cylindrical foam, etc. can use the well-known thing conventionally used in the field
- Examples of the physical foaming agent that is press-fitted into the extruder include aliphatic hydrocarbons having 2 to 7 carbon atoms, halogenated aliphatic hydrocarbons having 1 to 3 carbon atoms, aliphatic alcohols having 1 to 4 carbon atoms, or Those composed of one or more selected from aliphatic ethers having 2 to 8 carbon atoms, carbon dioxide and the like are preferably used.
- the physical foaming agent is preferably 0.1 to 50 parts by weight, more preferably 100 parts by weight in total of the resin constituting the foamed layer such as the polyethylene resin (A) and the polymer antistatic agent. Is 0.5 to 30 parts by weight.
- a bubble regulator is usually added to the first melt for forming the foam layer.
- the bubble adjusting agent either an organic type or an inorganic type can be used.
- the inorganic foam regulator include borate metal salts such as zinc borate, magnesium borate, borax, sodium chloride, aluminum hydroxide, talc, zeolite, silica, calcium carbonate, sodium bicarbonate, and the like.
- the organic bubble regulator include sodium 2,2-methylenebis (4,6-tert-butylphenyl) phosphate, sodium benzoate, calcium benzoate, aluminum benzoate, and sodium stearate.
- a combination of citric acid and sodium bicarbonate, a mono-alkali salt of citric acid and sodium bicarbonate, or the like can also be used as the bubble regulator. These bubble regulators can be used in combination of two or more.
- a volatile plasticizer to the second melt for forming the surface layer.
- the second melt and the first melt are coextruded by adding a volatile plasticizer, even if the extrusion temperature of the second melt is close to the proper foaming temperature of the foam layer, 2
- the melt elongation of the melt can be remarkably improved, and the elongation of the second melt can follow the elongation of the first melt.
- the volatile plasticizer volatilizes and disappears from the foam sheet after the foam sheet is manufactured.
- the melt viscosity of the polyethylene resin can be lowered to form a resin melt suitable for coextrusion, and after extrusion foaming. Is preferred since it volatilizes from the surface layer, does not easily disappear from the surface layer and remains in the foamed sheet, and is very unlikely to cause migration.
- Examples of the volatile plasticizer include saturated hydrocarbons having 2 to 7 carbon atoms, halogenated aliphatic hydrocarbons having 1 to 3 carbon atoms, aliphatic alcohols having 1 to 4 carbon atoms, or 2 to 8 carbon atoms. Those composed of one kind or two or more kinds selected from aliphatic ethers are preferably used.
- Examples of the saturated hydrocarbon having 2 to 7 carbon atoms exemplified in the volatile plasticizer include ethane, propane, normal butane, isobutane, normal pentane, isopentane, isohexane, cyclohexane and heptane.
- halogenated aliphatic hydrocarbon having 1 to 3 carbon atoms examples include methyl chloride, ethyl chloride, 1,1,1,2-tetrafluoroethane, and 1,1-difluoroethane.
- Examples of the aliphatic alcohol having 1 to 4 carbon atoms include methanol, ethanol, propanol, butanol, isopropyl alcohol, isobutyl alcohol, sec-butyl alcohol, and tert-butyl alcohol.
- Examples of the aliphatic ether having 2 to 8 carbon atoms include methyl ether, ethyl ether, propyl ether, isopropyl ether, methyl ethyl ether, methyl propyl ether, methyl isopropyl ether, methyl butyl ether, methyl isobutyl ether, and methyl amyl ether.
- the boiling point of the volatile plasticizer is preferably 80 ° C. or less, more preferably 60 ° C. or less because it easily volatilizes from the surface layer. When the boiling point of the volatile plasticizer is within this range, the volatile plasticizer is volatilized naturally from the surface layer by the heat after co-extrusion and the subsequent gas permeation at room temperature.
- the lower limit of the boiling point is approximately ⁇ 50 ° C.
- the addition amount of the volatile plasticizer is preferably 0.1 to 100 parts by weight, more preferably 1 to 50 parts by weight with respect to 100 parts by weight of the polyethylene resin (B).
- the polyethylene-based resin foam sheet of the present invention has antistatic properties, and the amount of organic matter transferred to the package is suppressed to a small level, it can be used for electronic devices such as slip sheets for glass panels for liquid crystal panels and the materials thereof. It can be suitably used as a packaging material.
- the amount of heptane extracted from the polyethylene resin was determined by the method described above.
- the heptane extraction amount of the mixed resin in Table 1 is the n-heptane extraction amount of the mixed resin kneaded at 200 ° C. with an extruder.
- a tandem extruder in which a first extruder having a diameter of 90 mm and a second extruder having a diameter of 120 mm are connected in series is used as an extruder for forming a foam layer, and the diameter is used as an extruder for forming a surface layer.
- a 50 mm third extruder was used, and an apparatus in which the outlet of the second extruder and the outlet of the third extruder were connected to an annular die for coextrusion was used.
- the annular die for coextrusion has a structure in which a second melt for forming a surface layer, which will be described later, is merged and laminated on both surfaces of the first melt for forming a foam layer at the middle part of the die, and the diameter of the lip at the die exit is 94 mm. It is.
- a die exit lip having a diameter of 70 mm was used.
- Example 1 The polymer type antistatic agent shown in Table 1 is blended with the polyethylene resin (A) shown in Table 1 in the amount shown in Table 1, and talc (trade name “High Filler # 12” manufactured by Matsumura Sangyo Co., Ltd.) is added thereto.
- the raw material blended by 1 part by weight was supplied to the raw material inlet of the first extruder, heated and kneaded to obtain a molten resin mixture adjusted to about 200 ° C.
- Table 1 shows the molten resin mixture as a physical foaming agent.
- a first melt for forming a polyethylene resin foam layer was obtained.
- the polyethylene resin (B) shown in Table 1 is supplied to the raw material charging port of the third extruder, heated and melted to obtain a molten resin mixture adjusted to about 200 ° C., and a volatile plasticizer is added to the molten resin mixture.
- a volatile plasticizer is added to the molten resin mixture.
- the resin temperature is adjusted to the resin temperature shown in Table 1 to form a second polyethylene-based resin surface layer forming layer. A melt was obtained.
- Each of the first and second melts is introduced into a co-extrusion annular die at a discharge amount shown in Table 1, the second melt is merged and laminated on both sides of the first melt, and is co-extruded from the annular die.
- a cylindrical multilayer foam having surface layers laminated on the inner and outer surfaces of the foam layer was formed. While the extruded cylindrical laminated foam was widened with a cylindrical widening apparatus having a diameter of 350 mm, the take-up speed was adjusted to obtain the total basis weight shown in Table 3 to obtain a polyethylene-based resin multilayer foamed sheet.
- Example 2 A polyethylene-based resin multilayer foamed sheet was obtained in the same manner as in Example 1 except that those shown in Table 1 were used as the polyethylene-based resin for forming the foam layer and the surface layer.
- Example 3 A polyethylene-based resin multilayer foamed sheet was obtained in the same manner as in Example 1 except that those shown in Table 1 were used as the polyethylene-based resin for forming the foam layer and the surface layer.
- Example 4 A polyethylene-based resin multilayer foamed sheet was obtained in the same manner as in Example 1 except that the discharge amount was changed as shown in Table 1 so that the thickness of the surface layer shown in Table 4 was obtained.
- Example 5 Using a co-extrusion annular die with a lip diameter of 70 mm, using the raw materials shown in Table 1 as the polyethylene resin (A), press-fitting mixed butane as the foaming agent in the amount shown in Table 1, and adjusting the resin temperature shown in Table 1
- the raw material shown in Table 1 is used as the polyethylene resin (B), mixed butane is injected as a volatile plasticizer in the amount shown in Table 1, the resin temperature shown in Table 1 is adjusted, and the foamed layer forming molten resin and surface
- the molten resin for layer formation is coextruded at the discharge amount shown in Table 1 to form a cylindrical laminated foam, and the basis weight shown in Table 3 along the cylindrical cooling device having a diameter of 212 mm.
- a polyethylene-based resin multilayer foamed sheet was obtained in the same manner as in Example 1 except that the take-up speed was adjusted so that
- Comparative Example 1 A polyethylene-based resin single-layer foamed sheet consisting only of a foamed layer containing a polymer antistatic agent was obtained in the same manner as in Example 1 except that the surface layer was not laminated. Although the obtained single-layer foamed sheet was excellent in antistatic properties, it did not have a surface layer, so that the amount of the low molecular weight component derived from the polymeric antistatic agent transferred to the package was large.
- Comparative Example 2 Example 1 except that the surface layer thickness was set to the thickness shown in Table 4, and the discharge amount and take-up speed of the foamed layer forming molten resin and the surface layer forming molten resin were adjusted to the total basis weight shown in Table 4. Similarly, a polyethylene resin multilayer foamed sheet was obtained. In the obtained multilayer foamed sheet, the thickness of the surface layer was too thin, so that the amount of the low molecular weight component derived from the polymer antistatic agent transferred to the package was large.
- Comparative Example 3 A polyethylene resin multilayer foamed sheet was obtained in the same manner as in Example 1 except that the polymer type antistatic agent in the amount shown in Table 2 was blended. The obtained multilayer foamed sheet was inferior in antistatic property because the blending amount of the antistatic agent was too small.
- Comparative Example 4 A polyethylene-based resin multilayer foamed sheet was obtained in the same manner as in Example 1 except that the polymer type antistatic agent was added to the foam layer forming resin in the amount shown in Table 2. Since the obtained multilayer foamed sheet contained too much antistatic agent, the amount of the low molecular weight component transferred to the package was large.
- Comparative Example 5 As the polyethylene resin (A) and the polyethylene resin (B), a polyethylene resin multilayer foamed sheet was obtained in the same manner as in Example 1 except that the resin having a large amount of heptane extraction shown in Table 2 was used. The obtained multilayer foamed sheet had a large transfer amount of the low molecular weight component derived from the polyethylene resin to the package.
- Comparative Example 6 As the polyethylene resin (A), a polyethylene resin multilayer foamed sheet was obtained in the same manner as in Example 1 except that the resin having a large amount of heptane extraction shown in Table 2 was used. The obtained multilayer foamed sheet had a large transfer amount of the low molecular weight component derived from the polyethylene resin to the package.
- the foam layer uses a resin with a large amount of heptane extraction shown in Table 2 as the polyethylene resin (A), does not contain a polymer type antistatic agent, and the surface layer shows a polyethylene resin (B) in Table 2.
- a polyethylene-based resin multilayer foamed sheet was obtained in the same manner as in Example 1 except that a resin and a polymer type antistatic agent of the type and blending amount shown in Table 2 were blended.
- the obtained multilayer foamed sheet was excellent in antistatic properties, but had a large amount of low molecular weight components transferred to the package.
- Comparative Example 8 Polyethylene resin multilayer as in Example 1, except that the foamed layer was not blended with a polymer antistatic agent and the surface layer was blended with a polymer antistatic agent of the type and blending amount shown in Table 2. A foam sheet was obtained. Although the obtained multilayer foamed sheet was excellent in antistatic properties, the amount of the low molecular weight component derived from the polymer antistatic agent transferred to the package was large.
- Table 1 shows the manufacturing conditions of the examples
- Table 2 shows the manufacturing conditions of the comparative examples
- Table 3 shows the physical properties of the foam sheets obtained in the examples
- Table 4 shows the physical properties of the foam sheets obtained in the comparative examples.
- test piece (length 100 mm ⁇ width 100 mm ⁇ thickness: thickness of foam sheet) obtained by randomly cutting out three pieces from the foam sheet was used as a sample.
- a surface resistance value 1 minute after application at an applied voltage of 500 V was adopted. The measurement was performed on both sides of the test piece (6 times in total), and the surface resistivity was obtained from the average value of the obtained measurement values.
- “TR8601” manufactured by Takeda Riken Kogyo Co., Ltd. was used as a measuring apparatus.
- the surface resistivity of the polymer antistatic agent is a value measured using a test piece obtained by heat-pressing the antistatic agent at 200 ° C. to 0.1 mm.
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Abstract
Description
ポリエチレン系樹脂(A)及びポリエチレン系樹脂(B)が共に、50℃でのn-ヘプタン抽出量が0.5重量%以下のポリエチレン系樹脂であり、
該発泡層への高分子型帯電防止剤の配合量がポリエチレン系樹脂(A)と高分子型帯電防止剤との合計100重量%に対して3~15重量%であり、
該表面層の厚みが2~10μmであることを特徴とするポリエチレン系樹脂多層発泡シートが提供される。
第3の態様において、本発明は、前記多層発泡シートの見掛け密度が15~300kg/m3であることを特徴とする前記第1又は第2の態様のポリエチレン系樹脂多層発泡シートを提供する。
第4の態様において、本発明は、前記第1~第3の態様のいずれかのポリエチレン系樹脂多層発泡シートからなるガラス板用間紙を提供する。
ポリエチレン系樹脂ペレットを粉砕する。得られた粉砕の200メッシュパスの試料約2gを秤量する。これをフラスコ内に投入し、ノルマルヘプタン400mlを加え、50℃にて48時間加熱還流する。得られた溶液を濾過し、分取された残留物から溶媒を加熱真空下にて除去する。得られた残留物の重量と投入したポリエチレン系樹脂の重量との差を求める。n-ヘプタン抽出量は、この差を投入したポリエチレン系樹脂の量を基準とした重量%である。
ここで、上記Tmaxとは、上記テンション荷重曲線において、検出されたピーク(山)値の合計値を検出された個数で除した値であり、上記Tminとは、上記テンション荷重曲線において、検出されたディップ(谷)値の合計値を検出された個数で除した値である。なお、当然のことながら上記測定において溶融樹脂をオリフィスから紐状に押出す際には該紐状物に、できるだけ気泡が入らないようにする。
まず、発泡シートを幅方向(押出方向に直行する方向)に沿って切断し、切断面を幅方向に10の等部分に分割する。切断面の10の部分の各々の幅方向中央部を測定箇所と定める。10の部分の各々を顕微鏡により撮影し、撮影した各々の画像上で、その測定箇所における表面層、発泡シートの厚みを測定する。得られた10個の測定した表面層厚値の算術平均値を表面層の厚みとし、10個の測定した発泡層厚値の算術平均値を発泡シートの厚みとする。なお、表面層の厚みを測定し易いように、発泡層か表面層のどちらか一方の層を着色することもできる。
なお、表面層の厚み[μm]は、発泡シートを製造する際に、押出し発泡条件の内、表面層の吐出量X[kg/時]と、得られる発泡シートの幅W[m]、得られる発泡シートの単位時間あたりの長さL[m/時]が判る場合には、表面層を構成するポリエチレン系樹脂の密度ρ[g/cm3]を用いて、以下の(1)式にて求めることができる。
表面層の厚み[μm]=〔1000×X/(L×W×ρ)〕・・・(1)
ポリエチレン系樹脂発泡シートの独立気泡率:S(%)は、ASTM D2856-70に記載されている手順Cに準拠し、東芝ベックマン株式会社製の空気比較式比重計930型を使用して測定される発泡シートの実容積(独立気泡の容積と樹脂部分の容積との和):Vx(L)から、下記(2)式により算出することにより求めることができる。
但し、上記(2)式中の、Va、W、ρは以下の通りである。
Va:測定に使用した発泡シートの見掛け容積(cm3)
W:試験片における発泡シートの質量(g)
ρ:発泡シートを構成する樹脂の密度(g/cm3)
本発明の積層発泡シートは、共押出法により、高分子型帯電防止剤を含むポリエチレン系樹脂発泡層の片面又は両面にポリエチレン系樹脂表面層が積層されることにより製造される。具体的には、発泡層形成用押出機の出口に共押出用ダイが取り付けられ、その共押出用ダイに表面層形成用押出機が連結された装置を用いて、共押出用ダイ内で、発泡層形成用の第1溶融物と表面層形成用の第2溶融物とを合流してから押出発泡することにより、発泡シートが製造される。
またクエン酸と重炭酸ナトリウム、クエン酸のモノアルカリ塩と重炭酸ナトリウム等を組み合わせたもの等も気泡調整剤として用いることができる。これらの気泡調整剤は2種以上を混合して用いることができる。
揮発性可塑剤の例に挙げた炭素数2以上7以下の飽和炭化水素としては、例えば、エタン、プロパン、ノルマルブタン、イソブタン、ノルマルペンタン、イソペンタン、イソヘキサン、シクロヘキサン、ヘプタンが挙げられる。
実施例で使用したポリエチレン系樹脂、及び気泡調整剤、並びに評価方法を以下に記載する。
(i)ダウ・ケミカル日本株式会社製「低密度ポリエチレン:商品名NUC8321」(略称LDPE1、密度922kg/m3、MFR1.9g/10分、融点111℃、ヘプタン抽出量1.15重量%)
(ii)東ソー株式会社製「低密度ポリエチレン:商品名10S54A」(略称LDPE2、密度925kg/m3、MFR1.8g/10分、融点111℃、ヘプタン抽出量0.15重量%)
(iii)東ソー株式会社製「高密度ポリエチレン:商品名ニポロンハード2500」(密度961kg/m3、MFR8.0g/10分、融点134℃、ヘプタン抽出量0.2重量%)
(iv)上記LDPE1を50℃のn-ヘプタン中に48時間浸漬し、低分子量成分を抽出したもの(略称LDPE3、密度922kg/m3、MFR1.7g/10分、融点111℃、ヘプタン抽出量0重量%)
(i)三洋化成工業(株)製「ポリエーテル-ポリオレフィンブロック共重合体:ペレクトロンHS(融点134℃、表面抵抗率2.0×106Ω)(略称PAA1)
(ii)高分子型帯電防止剤VL300
三洋化成工業(株)製「ポリエーテル-ポリオレフィンブロック共重合体:商品名:ぺレスタットVL300」(融点133℃、表面抵抗率1.2×108Ω)(略称PAA2)
松村産業株式会社製「タルク:商品名ハイフィラー#12」
発泡層形成用の押出機として直径90mmの第一押出機と直径120mmの第二押出機2台の押出機が直列に接続されたタンデム押出機を使用し、表面層形成用の押出機として直径50mmの第三押出機を使用し、第二押出機の出口と第三押出機の出口が共押出用環状ダイに接続された装置を用いた。共押出用環状ダイは、ダイ中間部で後述の表面層形成用第2溶融物が発泡層形成用第1溶融物の両面に合流積層される構造を有し、ダイ出口のリップの直径は94mmである。なお、実施例5においては、ダイ出口のリップの直径が70mmのものを用いた。
表1に示すポリエチレン系樹脂(A)に対し表1に示す高分子型帯電防止剤を表1に示す量を配合し、これにタルク(松村産業株式会社製 商品名「ハイフィラー#12」を1重量部配合した原料を、第一押出機の原料投入口に供給し、加熱混練し、約200℃に調整された溶融樹脂混合物とした。該溶融樹脂混合物に物理発泡剤として表1に示す量の混合ブタン(ノルマルブタン/イソブタン=70重量%/30重量%)を圧入し、次いで第一押出機の下流側に連結された第二押出機に供給して、表2に示す樹脂温度のポリエチレン系樹脂発泡層形成用第1溶融物を得た。
発泡層形成用及び表面層形成用のポリエチレン系樹脂として表1に示すものを用いた以外には、実施例1と同様にしてポリエチレン系樹脂多層発泡シートを得た。
発泡層形成用及び表面層形成用のポリエチレン系樹脂として、表1に示すものを用いた以外には、実施例1と同様にしてポリエチレン系樹脂多層発泡シートを得た。
表4に示す表面層の厚みとなるように吐出量を表1に示す通りに変更した以外は実施例1と同様にしてポリエチレン系樹脂多層発泡シートを得た。
リップ直径70mmの共押出用環状ダイを用い、ポリエチレン系樹脂(A)として表1に示す原料を用い、発泡剤として混合ブタンを表1に示す量圧入し、表1に示す樹脂温度に調整し、ポリエチレン系樹脂(B)として表1に示す原料を用い、揮発性可塑剤として混合ブタンを表1に示す量圧入し、表1に示す樹脂温度に調整し、発泡層形成用溶融樹脂と表面層形成用溶融樹脂を表1に示す吐出量で共押出して筒状積層発泡体を形成し、該筒状積層発泡体を直径212mmの筒状冷却装置に沿わせて表3に示した坪量となるよう引き取り速度を調整した以外、実施例1と同様にポリエチレン系樹脂多層発泡シートを得た。
表面層を積層しないこと以外、実施例1と同様にして、高分子型帯電防止剤を含む発泡層のみからなるポリエチレン系樹脂単層発泡シートを得た。
得られた単層発泡シートは、帯電防止性に優れるものの、表面層を有さないため、被包装物への高分子型帯電防止剤由来の低分子量成分の移行量が大きいものであった。
表面層厚みを表4に示す厚みとし、表4に示す総坪量となるように発泡層形成用溶融樹脂及び表面層形成用溶融樹脂の吐出量と引き取り速度を調整した以外は実施例1と同様にしてポリエチレン系樹脂多層発泡シートを得た。
得られた多層発泡シートは、表面層の厚みが薄すぎるため、被包装物への高分子型帯電防止剤由来の低分子量成分の移行量が大きいものであった。
表2に示す量の高分子型帯電防止剤を配合した以外は実施例1と同様にしてポリエチレン系樹脂多層発泡シートを得た。
得られた多層発泡シートは、帯電防止剤の配合量が少なすぎるため、帯電防止性に劣るものであった。
発泡層形成用樹脂に高分子型帯電防止剤を表2に示す量配合した以外は実施例1と同様にしてポリエチレン系樹脂多層発泡シートを得た。
得られた多層発泡シートは、帯電防止剤の配合量が多すぎるため、被包装物への低分子量成分の移行量が大きいものであった。
ポリエチレン系樹脂(A)及びポリエチレン系樹脂(B)として、表2に示すヘプタン抽出量の多い樹脂を用いた以外は実施例1と同様にしてポリエチレン系樹脂多層発泡シートを得た。
得られた多層発泡シートは、被包装物へのポリエチレン系樹脂由来の低分子量成分の移行量が大きいものであった。
ポリエチレン系樹脂(A)として、表2に示すヘプタン抽出量の多い樹脂を用いた以外は実施例1と同様にしてポリエチレン系樹脂多層発泡シートを得た。
得られた多層発泡シートは、被包装物へのポリエチレン系樹脂由来の低分子量成分の移行量が大きいものであった。
発泡層にポリエチレン系樹脂(A)として表2に示すヘプタン抽出量の多い樹脂を用いると共に、高分子型帯電防止剤を配合せず、且つ表面層にポリエチレン系樹脂(B)として表2に示す樹脂を用いると共に表2に示す種類、配合量の高分子型帯電防止剤を配合した以外は実施例1と同様にしてポリエチレン系樹脂多層発泡シートを得た。
得られた多層発泡シートは帯電防止性に優れるものの、被包装物への低分子量成分の移行量が大きいものであった。
発泡層には高分子型帯電防止剤を配合せず、且つ表面層に表2に示す種類、配合量の高分子型帯電防止剤を配合した以外は実施例1と同様にしてポリエチレン系樹脂多層発泡シートを得た。
得られた多層発泡シートは帯電防止性に優れるものの、被包装物への高分子型帯電防止剤由来の低分子量成分の移行量が大きいものであった。
(1)見掛け密度、坪量、全体厚み、表面層の厚みは前記のように測定した。
初期帯電圧の測定は、発泡シートより45mm×45mmのサイズ(厚みは発泡シートの厚み)に無作為に5枚切り出し、これらを試験片として、23℃、50%RH環境下にて24時間状態調節した後、スタティックオネストメーター(シシド静電気株式会社製 TIPE S-5109)を使用して23℃、50%RH環境下にてJIS L1094(1988年)A法に従って、ターンテーブル回転速度1300rpmとし、試験片の表面に(-)10kVの電圧を30秒間印加し、印加を停止した際の初期帯電圧を測定した。続いて、初期帯電圧の1/2となるまでの時間(半減期)を測定した。これらの測定を各試験片の両面に対して行ない(計10回)、各測定値を平均して初期帯電圧及び半減期とした。
発泡シートから無作為に3片切り出した試験片(縦100mm×横100mm×厚み:発泡シート厚み)をサンプルとした。JIS K6271(2001年)に準じて印加電圧500Vで印加してから1分後の表面抵抗値を採用した。なお、測定は試験片の両面に対して行ない(計6回)、得られた測定値の平均値から表面抵抗率を求めた。測定装置はタケダ理研工業株式会社製「TR8601」を用いた。また、高分子型帯電防止剤の表面抵抗率は、帯電防止剤を200℃にて0.1mmにヒートプレスしたものを試験片として用いて測定された値である。
あらかじめ、松浪ガラス工業株式会社製プレクリンスライドガラスの接触角をJIS-R3257-1999に記載の静滴法に基づき、協和界面科学株式会社製接触角計DM500Rを用いて評価した。該スライドガラスに評価を行うサンプル(実施例・比較例で得られた発泡シート)を3.8g/cm2の圧力で密着させつつ60℃下で24時間静置した。その後、サンプルをガラスから除去し、サンプルが接触していた面について再度接触角を同様に測定した。試験前後の接触角の差が10°以下であるものを○(良)、10°を超えるものを×(不良)として評価した。
Claims (4)
- 発泡層と発泡層の少なくとも片面に積層された表面層とを有し、発泡層形成用第1溶融物と表面層形成用第2溶融物とを共押出することにより得られたポリエチレン系樹脂多層発泡シートであって、ここで
前記第1溶融物はポリエチレン系樹脂(A)、高分子型帯電防止剤及び物理発泡剤から構成され、
前記第2溶融物はポリエチレン系樹脂(B)から構成され、
ポリエチレン系樹脂(A)及びポリエチレン系樹脂(B)の各々は、50℃でのn‐ヘプタン抽出量が0.5重量%以下であり、
該発泡層中に該高分子型帯電防止剤は、ポリエチレン系樹脂(A)と高分子型帯電防止剤との合計100重量%に対して3~15重量%存在し、
該表面層の厚みが2~10μmである、
ポリエチレン系樹脂多層発泡シート。 - 前記表面層の表面抵抗率が1×1014Ω未満である、請求項1のポリエチレン系樹脂多層発泡シート。
- 前記ポリエチレン系多層発泡シートの見掛け密度が15~300kg/m3である、請求項1又は2のポリエチレン系樹脂多層発泡シート。
- 請求項1~3のいずれかに記載のポリエチレン系樹脂多層発泡シートからなるガラス板用間紙。
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