CN110549713A - polyolefin resin laminated foam sheet and glass plate lining paper made of the laminated foam sheet - Google Patents

polyolefin resin laminated foam sheet and glass plate lining paper made of the laminated foam sheet Download PDF

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Publication number
CN110549713A
CN110549713A CN201910463645.1A CN201910463645A CN110549713A CN 110549713 A CN110549713 A CN 110549713A CN 201910463645 A CN201910463645 A CN 201910463645A CN 110549713 A CN110549713 A CN 110549713A
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China
Prior art keywords
foam sheet
polyethylene glycol
laminated foam
surface layer
mass
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CN201910463645.1A
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CN110549713B (en
Inventor
岩崎聪
西本敬
竹内亮平
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JSP
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JSP
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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
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
    • 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
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • 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
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B32B27/285—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polyethers
    • 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
    • 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
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethene
    • 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
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/025—Polyolefin
    • 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
    • B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
    • 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
    • B32B2307/70—Other properties
    • 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
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • B32B2323/046—LDPE, i.e. low density polyethylene
    • 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

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  • Chemical & Material Sciences (AREA)
  • Polymers & Plastics (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Laminated Bodies (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Buffer Packaging (AREA)
  • Packaging Frangible Articles (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

The invention provides a laminated foam sheet which can be used as an interleaving paper for glass sheets and can provide excellent cleaning performance to objects to be packaged such as glass sheets even under high temperature and high humidity, and an interleaving paper for glass sheets using the laminated foam sheet. The laminated foam sheet has a polyolefin resin foam layer and a polyolefin resin surface layer laminated and bonded to at least one surface side of the foam layer, wherein polyethylene glycol (PEG) comprising first polyethylene glycol (PEG1) that is liquid at 25 ℃ and second polyethylene glycol (PEG2) that is solid at 25 ℃ is blended in the surface layer, the amount of the first polyethylene glycol (PEG1) blended in the surface layer is 0.5 to 10 parts by mass per 100 parts by mass of the polyolefin resin constituting the surface layer, and the amount of the second polyethylene glycol (PEG2) blended in the surface layer is 3 parts by mass or more per 100 parts by mass of the first polyethylene glycol (PEG1) blended in the surface layer.

Description

Polyolefin resin laminated foam sheet and glass plate lining paper made of the laminated foam sheet
Technical Field
The present invention relates to a polyolefin resin laminated foam sheet and a backing sheet for glass plates comprising the laminated foam sheet.
Background
The polyolefin resin laminated foam sheet is excellent in flexibility and cushioning properties, and can prevent damage, scratches, and the like of an object to be packaged. Therefore, the laminated foam sheet has been widely used for a long time as a packaging material for home electric appliances, glassware, pottery, and the like. In addition, in recent years, with the development and demand for thin televisions expanding, polyolefin resin laminated foam sheets have been widely used as glass plate interleaving sheets used for the production and transportation of display panels such as liquid crystal displays, plasma displays, and electroluminescence displays.
The interleaving paper for glass plates is a sheet used by being sandwiched between glass plates. Generally, interleaving paper for glass sheets is used in order to prevent the possibility of scratches or breakage of glass sheets when a plurality of glass sheets are handled together, such as when the glass sheets are stored or transported.
When a glass plate is used for a display or the like, the surface of the glass plate is usually cleaned with water or the like. With the recent high definition of displays, glass plates for displays are required to have higher quality. Therefore, it is required to clean the surface of the glass plate to be very clean. Therefore, there is a growing demand for a glass lining paper that does not hinder the cleanability of objects to be packaged such as glass sheets or that can impart excellent cleanability to objects to be packaged such as glass sheets.
In response to such a demand, for example, patent document 1 proposes a polyolefin resin laminated foam sheet in which a hydrophilic compound such as polyethylene glycol is contained in a surface layer. When the polyolefin resin laminated foam sheet is used as a packaging sheet, the cleanliness of the packaged object packaged by the packaging sheet is improved. Therefore, even when foreign matter or the like is transferred from the packaging sheet to the object to be packaged, the object to be packaged is cleaned with water or the like, and the dirt on the surface of the object to be packaged can be easily removed.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2010-42556
Disclosure of Invention
technical problem to be solved by the invention
In recent years, in storage, transportation, or the like, an object to be packaged such as a glass plate is often placed in a high-temperature and high-humidity atmosphere. When a conventional polyolefin resin laminated foam sheet is used in a high-temperature and high-humidity atmosphere, the cleanness of an object to be packaged such as a glass plate may be slightly insufficient.
The purpose of the present invention is to provide a laminated foam sheet that can impart excellent cleaning properties to an object to be packaged such as a glass plate even under high-temperature and high-humidity conditions, and an interleaving paper for glass plates that uses the laminated foam sheet.
Means for solving the problems
The gist of the present invention is as follows:
(1) A polyolefin resin laminated foam sheet comprising a polyolefin resin foam layer and a polyolefin resin surface layer laminated and bonded to at least one surface side of the foam layer,
Polyethylene glycol (PEG) is blended in the surface layer,
The polyethylene glycol (PEG) is composed of the first polyethylene glycol (PEG1) which is liquid at 25 ℃ and the second polyethylene glycol (PEG2) which is solid at 25 ℃,
The amount of the first polyethylene glycol (PEG1) incorporated in the surface layer is 0.5 to 10 parts by mass, relative to 100 parts by mass of the polyolefin-based resin constituting the surface layer,
The blending amount of the second polyethylene glycol (PEG2) in the surface layer is 3 parts by mass or more with respect to 100 parts by mass of the blending amount of the first polyethylene glycol (PEG1) in the surface layer;
(2) The polyolefin-based resin laminated foam sheet according to the above (1), wherein the first polyethylene glycol (PEG1) has a number average molecular weight of 100 to 800;
(3) The polyolefin-based resin laminated foam sheet according to the above (1) or (2), wherein the second polyethylene glycol (PEG2) has a number average molecular weight of 2000 or more;
(4) The polyolefin-based resin laminated foam sheet according to any one of the above (1) to (3), wherein the solidifying point of the second polyethylene glycol (PEG2) is a temperature exceeding 50 ℃;
(5) The polyolefin-based resin laminated foam sheet according to any one of the above (1) to (4), wherein the amount of the second polyethylene glycol (PEG2) blended in the surface layer is 3 parts by mass or more and 100 parts by mass or less with respect to 100 parts by mass of the amount of the first polyethylene glycol (PEG1) blended in the surface layer;
(6) The polyolefin-based resin laminated foam sheet according to any one of the above (1) to (5), wherein the total blending amount of the polyethylene glycol (PEG) is 15 parts by mass or less with respect to 100 parts by mass of the polyolefin-based resin constituting the surface layer;
(7) The polyolefin-based resin laminated foam sheet according to any one of the above (1) to (6), wherein a polymer-based antistatic agent is blended in the surface layer in an amount of 2 parts by mass or more and 30 parts by mass or less with respect to 100 parts by mass of the polyolefin-based resin constituting the surface layer;
(8) the polyolefin-based resin laminated foam sheet according to any one of the above (1) to (7), wherein the polyolefin-based resin constituting the foam layer is low-density polyethylene, and the polyolefin-based resin constituting the surface layer is low-density polyethylene;
(9) a sheet for glass plate made of the polyolefin resin laminated foam sheet according to any one of the above (1) to (8).
Effects of the invention
The laminated foam sheet of the present invention is a polyolefin resin laminated foam sheet that can impart excellent cleanability to a packaged article such as a glass plate even under high temperature and high humidity conditions. Further, the interleaving paper for glass sheets of the present invention using the laminated foam sheet can impart excellent cleanability to glass sheets even under high temperature and high humidity.
Detailed Description
The laminated foam sheet of the present invention has a polyolefin-based resin foamed layer (hereinafter, sometimes simply referred to as foamed layer) and a polyolefin-based resin surface layer (hereinafter, sometimes simply referred to as surface layer).
(average thickness of laminated foam sheet)
the average thickness of the laminated foam sheet of the present invention is not particularly limited, but the average thickness of the laminated foam sheet is about 0.05mm to 10 mm. When the average thickness of the laminated foam sheet is within the above range, sufficient cushioning properties can be secured without increasing the volume even when the laminated foam sheet is used as a glass sheet interleaving paper. From the above-described viewpoint, the lower limit of the average thickness of the laminated foam sheet is preferably 0.07mm, more preferably 0.1mm, and still more preferably 0.12 mm. The upper limit of the average thickness of the laminated foam sheet is preferably 1.0mm, more preferably 0.5mm, and still more preferably 0.3 mm.
(specific average thickness of laminated foam sheet)
The average thickness of the laminated foam sheet in the present invention is specified as an arithmetic average of all thicknesses (mm) of the laminated foam sheet measured at intervals of 1cm in the width direction over the entire range of the laminated foam sheet. For example, when the laminated foam sheet is produced by a production method using an extruder, the width direction refers to a direction along the laminated foam sheet surface and a direction orthogonal to the extrusion direction of the laminated foam sheet.
(foaming layer)
The foamed layer of the laminated foamed sheet of the present invention is a layer formed using a foam having a polyolefin resin as a base resin. The polyolefin resin as the base resin is a resin in which the proportion of the constituent unit derived from the olefin monomer is 50 mol% or more. Examples of the polyolefin resin include polyethylene resins, polypropylene resins, and polybutylene resins. Among the polyolefin-based resins, a polyethylene-based resin is particularly preferable in terms of more excellent flexibility.
Examples of the polyethylene resin include high-density polyethylene, low-density polyethylene, linear low-density polyethylene, ethylene-vinyl acetate copolymer, ethylene-propylene-1-butene copolymer, ethylene-butene-1 copolymer, ethylene-1-hexene copolymer, ethylene-4-methyl-1-pentene copolymer, ethylene-1-octene copolymer, and a mixture of 2 or more of these.
among these polyethylene resins, low-density polyethylene is preferable, and in the present specification, low-density polyethylene is a polyethylene resin having a density of 890kg/m 3 to 935kg/m 3, preferably 900kg/m 3 to 930kg/m 3.
examples of the polypropylene resin include a propylene homopolymer and a copolymer of propylene and another olefin. Examples of the other olefin copolymerizable with propylene include ethylene, and α -olefins having 4 to 10 carbon atoms such as 1-butene, isobutylene, 1-pentene, 3-methyl-1-butene, 1-hexene, 3, 4-dimethyl-1-butene, 1-heptene, and 3-methyl-1-hexene.
Other resins such as styrene resins, elastomers such as ethylene propylene rubber and styrene-butadiene-styrene block copolymers, and the like may be added to the polyolefin resin within a range not to impair the effects of the present invention. In this case, the amount of the other resin, elastomer, or the like added is preferably 25 parts by mass or less, more preferably 10 parts by mass or less, and particularly preferably 5 parts by mass or less, assuming that the amount of the polyolefin resin added to form the foamed layer is 100 parts by mass.
Further, 1 or 2 or more additives may be added to the polyolefin-based resin within a range not impairing the effects of the present invention. Examples of the additives include functional additives such as bubble control agents, nucleating agents, antioxidants, heat stabilizers, weather resistance agents, ultraviolet absorbers, flame retardants, antibacterial agents, and anti-shrinking agents, and inorganic fillers.
(apparent Density of laminated foam sheet)
The laminated foam sheet of the present invention preferably has an apparent density of 20kg/m 3 to 450kg/m 3, and when the apparent density of the laminated foam sheet is within the above range, the laminated foam sheet is excellent in flexibility and also excellent in mechanical strength such as shape retention and compressive strength, and from the viewpoint of flexibility of the laminated foam sheet, the upper limit of the apparent density is preferably 300kg/m 3, more preferably 200kg/m 3, and from the viewpoint of mechanical strength or elastic strength of the laminated foam sheet, the lower limit of the apparent density is preferably 30kg/m 3, more preferably 40kg/m 3, and further preferably 50kg/m 3.
The apparent density of the laminated foam sheet is specified by a value obtained by cutting a test piece from the laminated foam sheet and dividing the mass (kg) of the test piece by the volume (m 3) determined from the outer dimensions of the test piece.
(surface layer)
The surface layer of the laminated foam sheet of the present invention is laminated and bonded to at least one surface side of the front surface and the back surface of the foam layer, and is positioned on the outermost surface side of the laminated foam sheet. Further, an intermediate layer may be formed between the foamed layer and the surface layer. Examples of the intermediate layer include a layer made of a resin having adhesion to both the foamed layer and the surface layer.
the thickness of the surface layer is not particularly limited, and may be appropriately determined within a range that does not impair the cushioning properties of the foamed layer. For example, it is preferable that the average thickness of the surface layer on one side is smaller than the average thickness of the foamed layer. In the laminated foam sheet having the surface layers on both sides, the sum total of the average thicknesses of the surface layers on both sides is preferably smaller than the average thickness of the foam layer. In addition, the average thickness of the surface layer mentioned here can be obtained by the following method. First, the laminated foamed sheet was cut in the width direction to form cut surfaces in which enlarged photographs were taken at intervals of 1cm in the width direction over the entire range of the sheet. Then, the thickness (mm) of the surface layer of each point photographed was measured, and the average thickness based on the arithmetic mean of these was calculated. The above measurement was performed on 3 randomly selected places on the laminated foam sheet, and the arithmetic average of the calculated values of the average thicknesses of the 3 places was taken as the average thickness of the surface layer.
The surface layer is a layer formed of a resin composition containing a polyolefin resin as a base resin. As the polyolefin resin as the base resin, and other resins or additives blended therein, the same ones as those described for the foamed layer can be used.
for example, the surface layer is preferably a non-foamed layer. The non-foamed layer mentioned herein is a resin layer formed without using a foaming agent or the like for foaming the resin. The non-foamed layer includes a resin layer containing bubbles that are accidentally generated or mixed in during the manufacturing process.
In the laminated foam sheet of the present invention, the same resin may be used for the polyolefin-based resins constituting the foam layer and the surface layer, or different resins may be used for the foam layer and the surface layer. When the foamed layer and the surface layer are formed of the same type of resin as each other as the laminated foamed sheet, the adhesiveness between the foamed layer and the surface layer is high. From the viewpoint of adhesion between the foamed layer and the surface layer, it is preferable to use low-density polyethylene not only for the foamed layer but also for the surface layer.
The basis weight (basis weight) of the surface layer is preferably 0.5g/m 2 or more, more preferably 0.7g/m 2 or more, and further preferably 1.0g/m 2 or more on one side, and the desired cleanness of the object to be wrapped is sufficiently improved if the basis weight of the surface layer satisfies the above range.
When the laminated foam sheet is produced by a production method using an extruder, the basis weight [ g/m 2 ] of the surface layer in the present invention can be determined by the following formula (1) from the discharge amount X [ kg/h ] of the surface layer at the time of producing the laminated foam sheet, the width W [ m ] of the obtained laminated foam sheet, and the length L [ m/h ] of the laminated foam sheet produced per unit time.
[ mathematical formula 1]
Base amount [ g/m 2 ] - [ 1000X/(L.times.W) ] … (1)
(polyethylene glycol (PEG))
polyethylene glycol (PEG) is blended in the surface layer of the laminated foam sheet of the present invention. The polyethylene glycol (PEG) blended in the surface layer is composed of a first polyethylene glycol (PEG1) and a second polyethylene glycol (PEG 2).
The laminated foam sheet of the present invention can impart excellent cleanability to an object to be packaged such as a glass plate even when placed in a high-temperature and high-humidity atmosphere. The reason why the laminated foam sheet of the present invention can provide excellent cleaning properties to a packaged object even under high temperature and high humidity conditions is not clear, but 2 reasons shown below can be considered.
first, the laminated foam sheet of the present invention incorporates a first polyethylene glycol that is liquid at 25 ℃ and a second polyethylene glycol (PEG2) that is solid at 25 ℃, so that the water absorption of the laminated foam sheet is suppressed to be low. Thus, it is believed that: dust or dust is less likely to adhere to the surface of the laminated foam sheet even when the laminated foam sheet is left in a high-temperature and high-humidity atmosphere. Further, since the water absorption rate of the laminated foam sheet is suppressed to be low, it is considered that impurities such as hydrogen ions and calcium ions contained in organic substances or moisture in the air, which are main factors of fouling, can be suppressed from adhering to the laminated foam sheet together with moisture in the air.
thus, it is believed that: when the laminated foam sheet of the present invention is used as a packaging material, it is possible to effectively prevent foreign matter such as dust, the organic matter, or the impurities from adhering to the object to contaminate the object.
Second, it is considered that the first polyethylene glycol (PEG1) can more uniformly overflow from the surface layer to the packaged object even when the laminated foam sheet of the present invention is placed in a high-temperature and high-humidity atmosphere.
That is, the first polyethylene glycol (PEG1) contained in the surface layer overflows from the surface layer and adheres to the surface of the object to be packed, and the removal of the surface dirt when the object to be packed is washed is facilitated. However, the first polyethylene glycol (PEG1) which is liquid at 25 ℃ tends to become droplets on the surface layer and to be unevenly present. Thus, upon spillage, the first polyethylene glycol (PEG1) is difficult to move uniformly onto the packaged item. In contrast, the laminated foam sheet of the present invention can uniformly disperse the first polyethylene glycol (PEG1) on the surface layer by the presence of the second polyethylene glycol (PEG 2). Thus, it is believed that: the laminated foam sheet of the present invention can more uniformly transfer the first polyethylene glycol (PEG1) as a hydrophilic compound from the surface layer to the packaged object. As a result, it is considered that unevenness in cleaning of the object to be packaged can be suppressed and excellent cleaning performance can be provided when the object to be packaged is washed.
For the above reasons, it is considered that the laminated foam sheet of the present invention can impart excellent cleaning properties to the packaged object even under high temperature and high humidity conditions.
(blending amount of polyethylene glycol)
The total blending amount of polyethylene glycol (PEG) in the surface layer is preferably 15 parts by mass or less with respect to 100 parts by mass of the polyolefin-based resin constituting the surface layer. When the total amount of polyethylene glycol (PEG) in the surface layer is within the above range, a laminated foam sheet capable of providing a more excellent cleaning property to a material to be packaged such as a glass plate even in a high-temperature and high-humidity atmosphere is obtained. From the above-described viewpoint, the upper limit of the blending amount of polyethylene glycol (PEG) is more preferably 12 parts by mass, and still more preferably 10 parts by mass. The lower limit of the blending amount of polyethylene glycol (PEG) is preferably more than 0.5 parts by mass and 1.0 part by mass.
(first polyethylene glycol (PEG1))
The first polyethylene glycol (PEG1) in the surface layer was a polyethylene glycol that was liquid at 25 ℃. By making the first polyethylene glycol (PEG1) liquid at 25 ℃, the first polyethylene glycol (PEG1) more easily overflows from the surface layer, and thus excellent cleaning properties can be imparted to the packaged article. From the above-described viewpoint, the first polyethylene glycol (PEG1) is more preferably liquid at 23 ℃, still more preferably liquid at 10 ℃, and particularly preferably liquid at 0 ℃.
(number average molecular weight of first polyethylene glycol (PEG1))
The number average molecular weight of the first polyethylene glycol (PEG1) is preferably 100 to 800. When the number average molecular weight of the first polyethylene glycol (PEG1) is within the above range, the first polyethylene glycol (PEG1) easily overflows from the surface layer, and excellent cleaning properties can be imparted to the packaged object. From the above-described viewpoint, the lower limit of the number average molecular weight of the first polyethylene glycol (PEG1) is more preferably 150, and still more preferably 200. The upper limit of the number average molecular weight of the first polyethylene glycol (PEG1) is more preferably 700, and still more preferably 600.
(method for specifying number average molecular weight)
the number average molecular weight of the first polyethylene glycol (PEG1) can be determined by a known method based on the hydroxyl value.
(amount of first polyethylene glycol (PEG1) blended)
The amount of the first polyethylene glycol (PEG1) incorporated in the surface layer is 0.5 to 10 parts by mass, relative to 100 parts by mass of the polyolefin-based resin constituting the surface layer. When the blending amount of the first polyethylene glycol (PEG1) is within the above range, the laminated foam sheet can impart more excellent cleaning property to the article to be packaged. From the above-described viewpoint, the lower limit of the blending amount of the first polyethylene glycol (PEG1) is more preferably 1.0 part by mass, and still more preferably 2 parts by mass. The upper limit of the amount of the first polyethylene glycol (PEG1) is more preferably 8 parts by mass, and still more preferably 6 parts by mass.
The first polyethylene glycol (PEG1) is commercially available. In the present invention, examples of commercially available products that can be used as the first Polyethylene Glycol (PEG1) include "Polyethylene Glycol 300" manufactured by FUJIFILM Wako Pure Chemical co.
(second polyethylene glycol (PEG2))
The second polyethylene glycol (PEG2) in the surface layer was a polyethylene glycol that was solid at 25 ℃. By blending the second polyethylene glycol (PEG2) that is solid at 25 ℃ together with the first polyethylene glycol (PEG1) that is liquid at 25 ℃ into the surface layer of the laminated foam sheet, it is possible to impart more excellent cleanability to the object to be packaged such as a glass plate even when the laminated foam sheet is left in a high-temperature and high-humidity atmosphere.
(number average molecular weight of second polyethylene glycol (PEG2))
The number average molecular weight of the second polyethylene glycol (PEG2) is preferably 2000 or more, more preferably 2500 or more, and even more preferably 3000 or more, from the viewpoint of further improving the cleanness of the packaged object such as a glass plate under high temperature and humidity conditions. The upper limit of the number average molecular weight of the second polyethylene glycol (PEG2) is approximately 20000.
(method for specifying number average molecular weight)
The number average molecular weight of the second polyethylene glycol (PEG2) can be determined by the same method as the number average molecular weight of the first polyethylene glycol (PEG 1).
(freezing Point of second polyethylene glycol (PEG2))
Further, the freezing point of the second polyethylene glycol (PEG2) is preferably a temperature exceeding 50 ℃, more preferably 52 ℃ or higher, and even more preferably 55 ℃ or higher, from the viewpoint of further improving the cleanness of the packaged object such as a glass plate under high temperature and high humidity conditions. The upper limit of the freezing point of the second polyethylene glycol (PEG2) is about 65 ℃.
(method for specifying freezing Point)
The freezing point of the second polyethylene glycol (PEG2) can be determined by the method described in JIS K0065 (1992).
(amount of second polyethylene glycol (PEG2) blended)
The amount of the second polyethylene glycol (PEG2) blended in the surface layer is 3 parts by mass or more with respect to 100 parts by mass of the amount of the first polyethylene glycol (PEG1) blended in the surface layer. If the amount of the second polyethylene glycol (PEG2) is too small, sufficient cleaning properties may not be imparted to the object to be packaged such as a glass plate when the object is left in a high-temperature and high-humidity atmosphere. From the above-described viewpoint, the blending amount of the second polyethylene glycol (PEG2) in the surface layer is more preferably 5 parts by mass or more with respect to 100 parts by mass of the blending amount of the first polyethylene glycol (PEG1) in the surface layer.
The upper limit of the amount of the second polyethylene glycol (PEG2) in the surface layer is not particularly limited, but is preferably 100 parts by mass or less with respect to 100 parts by mass of the amount of the first polyethylene glycol (PEG1) in the surface layer, from the viewpoint of production stability of the laminated foam sheet.
In particular, from the viewpoint of imparting the above-mentioned cleaning property and production stability, it is preferable that: the total blending amount of polyethylene glycol (PEG) in the surface layer is 15 parts by mass or less with respect to 100 parts by mass of the polyolefin-based resin constituting the surface layer; and the amount of the second polyethylene glycol (PEG2) in the surface layer is 3 parts by mass or more and 100 parts by mass or less with respect to 100 parts by mass of the amount of the first polyethylene glycol (PEG1) in the surface layer.
The second polyethylene glycol (PEG2) is commercially available. In the present invention, examples of commercially available products that can be used as the second Polyethylene Glycol (PEG2) include "Polyethylene Glycol 6000" manufactured by FUJIFILM Wako Pure Chemical co.
Further, the laminated foam sheet of the present invention contains a first polyethylene glycol (PEG1) and a second polyethylene glycol (PEG2) in the surface layer. Therefore, even in a high-temperature and high-humidity atmosphere, the peel strength of the laminated foam sheet from the object to be packaged is low. Therefore, for example, when the object to be packed is lifted and taken out, the packaging material made of the laminated foam sheet can be prevented from being lifted together with the object to be packed following the object to be packed. As a result, workability in using the object to be packed can be improved.
(antistatic agent)
The laminated foam sheet of the present invention may contain an antistatic agent in the surface layer within a range not impairing the intended effects of the present invention. As the antistatic agent, a polymer type antistatic agent is preferably used. Examples of the polymer type antistatic agent include polyether-polyolefin copolymers and ionomer resins. Examples of the polyether-polyolefin copolymer include those sold under trade names such as "Pelestat (trademark) VL 300", "Pelestat (trademark) 300", "Pelestat HC 250", "pellecton (trademark) HS", "pellecton PVH" and "pellecton LMP", manufactured by sanyo chemical Industries, ltd. Examples of the ionomer resin include those sold under trade names such as "Entira (trademark) SD 100" and "Entira MK 400" manufactured by Du Pont-Mitsui polychemics co.
(surface resistivity)
The surface resistivity of the laminated foam sheet of the present invention is preferably 1 × 10 8 Ω to 1 × 10 14 Ω, and if the surface resistivity of the laminated foam sheet is within the above range, the laminated foam sheet exhibits sufficient antistatic properties, and from the above viewpoint, the surface resistivity of the laminated foam sheet is preferably 5 × 10 13 Ω or less, and more preferably 1 × 10 13 Ω or less.
The surface resistivity of the laminated foam sheet can be measured according to JIS K6271 (2008). That is, the test piece cut into a predetermined size including the surface layer of the laminated foam sheet was left to stand at a temperature of 20 ℃ and a relative humidity of 30% for 36 hours, and the condition of the test piece was adjusted. Using the conditioned test piece, voltage application was started under the condition that the applied voltage was 500V in accordance with JIS K6271 (2008), and after 1 minute, the surface resistivity of the surface portion of the surface layer of the laminated foam sheet in the test piece was obtained and used as the surface resistivity of the laminated foam sheet.
The amount of the polymer type antistatic agent blended is preferably 2 parts by mass or more and 30 parts by mass or less with respect to 100 parts by mass of the polyolefin resin constituting the surface layer. When the blending amount of the antistatic agent is within the above range, the laminated foam sheet is excellent in antistatic performance. From the above-described viewpoint, the blending amount of the antistatic agent is more preferably 3 parts by mass or more and 25 parts by mass or less, and still more preferably 5 parts by mass or more and 20 parts by mass or less, with respect to 100 parts by mass of the polyolefin-based resin constituting the surface layer.
(method for producing laminated foam sheet)
The laminated foam sheet of the present invention can be produced by, for example, a coextrusion method using an annular die. First, a polyolefin-based resin for foam layer formation and an additive such as a bubble control agent added as needed are supplied to an extruder for foam layer formation. Then, the mixture containing the polyolefin-based resin and the additive is heated and kneaded, the physical foaming agent is further pressed in, and the mixture and the physical foaming agent are kneaded to obtain a resin melt for forming a foamed layer. On the other hand, an additive such as a polyolefin resin for forming a surface layer, polyethylene glycol, and an antistatic agent added as needed is supplied to an extruder for forming a surface layer, and heated and kneaded to obtain a resin melt for forming a surface layer. Then, the resin melt for forming the foamed layer and the resin melt for forming the surface layer are introduced into an annular die for coextrusion, and coextrusion foaming is performed. In this way, a cylindrical laminated foam in which a surface layer is laminated on a foam layer is formed, and the cylindrical laminated foam is drawn and cut while expanding the diameter, thereby obtaining a laminated foam sheet.
in the method for producing a laminated foam sheet, in order to obtain a resin melt for forming a surface layer, a first polyethylene glycol (PEG1) and a second polyethylene glycol (PEG2) are added as polyethylene glycols. In this case, the method of adding the first polyethylene glycol (PEG1) and the second polyethylene glycol (PEG2) is not particularly limited. For example, the first polyethylene glycol (PEG1) and the second polyethylene glycol (PEG2) may be supplied to the surface layer forming extruder at the same time, or may be supplied to the surface layer forming extruder separately. Further, the second polyethylene glycol (PEG2) may be supplied to the surface layer forming extruder together with the polyolefin-based resin, or may be heated in advance to be in a liquid state and supplied to the surface layer forming extruder using a submerged pump or the like. The first polyethylene glycol (PEG1) may also be supplied to the surface layer-forming extruder using a submerged pump. Alternatively, the first polyethylene glycol (PEG1) and the second polyethylene glycol (PEG2) may be kneaded with the polyolefin-based resin for surface layer formation in advance to prepare a master batch, and then supplied to the extruder for surface layer formation.
As the bubble control agent that can be used in forming the foamed layer, any of an organic bubble control agent and an inorganic bubble control agent can be used. Examples of the inorganic bubble control agent include metal borates such as zinc borate, magnesium borate and borax, sodium chloride, aluminum hydroxide, talc, zeolite, silica, calcium carbonate and calcium hydrogen carbonate. Examples of the organic bubble controlling agent include sodium 2, 2-methylenebis (4, 6-tert-butylphenyl) phosphate, sodium benzoate, calcium benzoate, aluminum benzoate, and sodium stearate. Further, a combination of citric acid and calcium hydrogen carbonate, or an alkali metal salt of citric acid (alkali salt) and calcium hydrogen carbonate, or the like can be used as the bubble controlling agent. Further, 2 or more of these exemplary bubble control agents may be used in combination.
Among the above, talc is preferably used as the cell regulator in view of easy adjustment of the cell diameter of the foamed layer. The bubble control agent is preferably added in a range of about 0.1 to 3 parts by mass, more preferably 0.2 to 2 parts by mass, based on 100 parts by mass of the polyolefin resin constituting the foamed layer.
The physical foaming agent can be used without particular limitation as long as it can be applied to the production of a foamed layer of a laminated foamed sheet. As the physical blowing agent, an inorganic physical blowing agent or an organic physical blowing agent can be used. Examples of the inorganic physical blowing agent include oxygen, nitrogen, carbon dioxide, and air. Examples of the organic physical blowing agent include aliphatic hydrocarbons such as propane, n-butane, isobutane, n-pentane, isopentane, n-hexane, isohexane, and cyclohexane; chlorinated hydrocarbons such as methyl chloride and ethyl chloride; fluorinated hydrocarbons such as 1,1,1, 2-tetrafluoroethane, 1, 1-difluoroethane, 1,3,3, 3-tetrafluoropropene, and 1-chloro-3, 3, 3-trifluoropropene; ethers such as dimethyl ether and methyl ethyl ether; or alcohols such as methanol and ethanol. Further, 2 or more physical blowing agents may be used in combination.
Among these physical blowing agents, n-butane, isobutane or a mixture thereof is preferably used as the physical blowing agent, from the viewpoint that the coextrusion method can be stably performed and a good foamed layer can be stably obtained.
(slip sheet for glass plate)
The laminated foam sheet of the present invention can be used as a sheet for lining glass plates. The interleaving paper for glass plates can be used by being sandwiched between the glass plates, and can prevent breakage due to contact between the glass plates. As a glass plate using such a glass plate interleaving paper, a glass plate for a display such as a liquid crystal display can be mentioned. Glass plates for displays are generally used after removing a sheet of interleaving paper for glass plates interposed between the glass plates and then washing the glass plates one by one with water or the like. In this case, when dust, dirt, organic matter, or the like comes into contact with the surface of the glass plate, it is difficult to wash the dust, dirt, organic matter, or the like with water or the like. In this regard, when the interleaving paper for glass plates is composed of the laminated foam sheet of the present invention, polyethylene glycol is favorably transferred from the laminated foam sheet to the surface of the glass plate, and when each glass plate is washed with water or the like, dust, dirt, organic matter, or the like adhering to the surface of the glass plate can be easily washed.
Further, the interleaving paper for glass sheets may be placed in a high-temperature and high-humidity atmosphere with the interleaving paper interposed between the glass sheets. In this regard, when the interleaving paper for glass plates is composed of the laminated foam sheet of the present invention, the water absorption rate of the laminated foam sheet is suppressed to be low, and dust, organic matter, or the like is less likely to adhere to the surface of the laminated foam sheet even when placed in a high-temperature and high-humidity atmosphere. Therefore, the foam sheets are laminated to effectively prevent the glass plate from being contaminated by dust, organic matter, or the like adhering to the glass plate.
Further, as described above, the laminated foam sheet of the present invention has a low peel strength from the packaged article even in a high-temperature and high-humidity atmosphere. Therefore, for example, when the plate-shaped object to be packed is lifted and taken out, the laminated foam sheet is lifted together with the object to be packed without following the object to be packed, and workability is good. From this point of view, the laminated foam sheet of the present invention can be suitably used as a sheet for glass plate.
In addition, the laminated foam sheet of the present invention may have a surface layer laminated on both surfaces, as well as a surface layer laminated on only one surface of the foam layer. When the laminated foam sheet is used as a sheet for lining glass sheets, surface layers are preferably laminated on both sides of the foam layer. The slip sheets for glass sheets having surface layers on both sides of a foamed layer can reduce the staining property of 2 glass sheets in contact with the slip sheets for glass sheets and improve the cleaning property when the slip sheets are sandwiched between the glass sheets.
The present invention will be described in detail below with reference to examples. However, the present invention is not limited to the examples.
Examples
As the polyolefin-based resin, low-density polyethylene (density 922kg/m 3) (in Table 2, abbreviated as LDPE 1) (grade NUC8321, manufactured by NUC Corporation) was used.
As polyethylene glycol (abbreviated as PEG in tables 1 and 2), 4 kinds of PEG300, PEG600, PEG4000, and PEG6000 were used as shown in table 1. PEG300, PEG600 corresponded to the first polyethylene glycol (indicated in table 2 by short for PEG1), PEG4000, PEG6000 corresponded to the second polyethylene glycol (indicated in table 2 by short for PEG 2).
[ Table 1]
For short Number average molecular weight Freezing point (. degree.C.) State at 25 deg.C
PEG300 300 ＜-8 liquid, method for producing the same and use thereof
PEG600 600 21 Liquid, method for producing the same and use thereof
PEG4000 3400 56 Solid body
PEG6000 8300 59 Solid body
As the antistatic agent, a polyether-polyolefin copolymer (shown by ASP1 in table 2 for short) as a polymer type antistatic agent (product name Pelestat (trademark) 300, volume resistivity 1 × 10 8 (Ω · cm) manufactured by Sanyo Chemical Industries, ltd.) was used.
As the physical blowing agent, mixed butane composed of 70 mass% of n-butane and 30 mass% of isobutane was used.
As the bubble control agent, a master batch of the bubble control agent, in which 20 mass% of talc (manufactured by matsumura sangyo co., ltd., trade name HI-FILLER #12) was blended to 80 mass% of low-density polyethylene, was used.
As the extruder for forming the foamed layer, a tandem (tandem) extruder composed of a first extruder having an inner diameter of 90mm and a second extruder having an inner diameter of 120mm was used, and as the extruder for forming the surface layer, a third extruder having an inner diameter of 50mm and an L/D of 50 was used. Further, the outlets of the second extruder and the third extruder are connected to a ring-shaped coextrusion die, and the respective resin melts described later can be laminated in the ring-shaped coextrusion die. The laminated foam sheets in each example and each comparative example were designed so that the average thickness of the foam layer was 0.1464mm and the average thickness of the surface layer on both sides was 0.0018mm, respectively.
Examples 1 to 7
(preparation of resin melt for foam layer formation)
A low-density polyethylene resin and 1.5 parts by mass of a master batch of a cell regulator per 100 parts by mass of the resin were supplied to a first extruder, and melted and kneaded to prepare a resin melt adjusted to about 200 ℃. Then, mixed butane was pressed in an amount of 10 parts by mass per 100 parts by mass of the resin, and the resulting mixture was conveyed to a second extruder connected to the downstream side of the first extruder, and the temperature of the extruded resin was adjusted to 115 ℃ to prepare a resin melt for forming a foam layer, which was introduced into the annular die for coextrusion.
(preparation of resin melt for surface layer formation)
On the other hand, the low-density polyethylene resin and the high-molecular antistatic agent in the amounts shown in table 2, and the first polyethylene glycol (PEG1) and the second polyethylene glycol (PEG2) in the amounts and kinds shown in table 2 were supplied to a third extruder, melted and kneaded, the temperature of the extrusion resin was adjusted to 115 ℃, and a resin melt for surface layer formation was prepared and introduced into the annular die for coextrusion. In addition, the PEG1 was fed via a submerged pump connected to the third extruder, and PEG2 was added to the third extruder together with the low-density polyethylene-based resin.
A resin melt for forming a surface layer introduced into an annular die for coextrusion was laminated on the outside and inside of a resin melt for forming a foamed layer introduced into an annular die for coextrusion, and extruded from the annular die into the atmosphere at a discharge rate of 130kg/hr to prepare a cylindrical laminated foam, and at this time, the cylindrical laminated foam was expanded in diameter so that the blow-off ratio (blow-up ratio) became 2.8, pulled at a pulling speed of 67m/min, and further cut in the extrusion direction, whereby a laminated foamed sheet (width about 1400mm) having a 3-layer structure of a surface layer/foamed layer/surface layer was produced, and the basis weight of the surface layer (single side) of the laminated foamed sheet produced under the above conditions was 1.7g/m 2.
The average thickness, apparent density, surface resistivity, water absorption and glass plate peel strength of the obtained laminated foam sheet were measured as follows. Further, the glass plate cleanliness was evaluated as follows. The results are shown in Table 2.
(average thickness of laminated foam sheet)
The thickness (mm) of the sheet was measured at intervals of 1cm in the width direction over the entire range of the laminated foamed sheet, and the average thickness based on the arithmetic mean of these was calculated. The measurement was performed on 3 randomly selected positions on the laminated foamed sheet, and the arithmetic average of the calculated values of the average thickness of the 3 positions was defined as the average thickness (mm) of the laminated foamed sheet.
(apparent Density of laminated foam sheet)
After 5 spots were randomly selected in the extrusion direction of the laminated foam sheet, 5 test pieces were prepared by cutting the sheet at each position over the entire range of the sheet to a width of 100mm, and the mass (kg) of each test piece was measured to determine the volume (m 3) from the outside dimension, the apparent density (kg/m 3) of each test piece was determined by dividing the volume (m 3) by the mass (kg), and the arithmetic average of the obtained values was taken as the apparent density (kg/m 3).
(surface resistivity of laminated foam sheet)
The surface resistivity of the laminated foam sheet was measured according to JIS K6271 (2008). Specifically, test pieces 100mm in length and 100mm in width were randomly cut from the laminated foam sheet, and the condition of the test pieces was adjusted by leaving the foam sheet at 20 ℃ for 36 hours in an atmosphere of 30% relative humidity. Subsequently, a voltage was applied to both sides of each test piece under the condition that the applied voltage was 500V. After 1 minute from the start of voltage application, the surface resistivity of the test piece was measured, and the arithmetic average value of these values (5 test pieces × both surfaces [ n ═ 10]) was taken as the surface resistivity (Ω) of the laminated foam sheet.
(Water absorption of laminated foam sheet)
The water absorption (mass ppm) of the laminated foam sheet was measured in the following manner. First, 5 test pieces having a size of 500mm in width by 400mm in length were cut from the laminated foam sheet, and stored under 2 conditions of 25 ℃ temperature, 50% RH humidity, 50 ℃ temperature, and 80% RH humidity for 24 hours. Then, the test piece was dried at 180 ℃ in a closed air-tight space, and the moisture-free substance was removed, and the moisture was selectively adsorbed on a molecular sieve adsorbent (molecular sieve 3A ° manufactured by Nacalai Tesque inc.) and the water absorption rate (mass ppm) was determined from the change in mass thereof by the following equation (2). The arithmetic average value thereof was defined as the water absorption percentage (ppm) of the laminated foam sheet. In addition, RH represents relative humidity.
[ mathematical formula 2]
Water absorption (mass ppm) [ (M 2 -M 3)/M 1 ] × 10 6 … (2)
In the formula (2), M 1 represents the mass (g) of the test piece before drying, M 2 represents the mass (g) of the adsorbent after water absorption, and M 3 represents the mass (g) of the adsorbent before water absorption.
(glass plate peeling Strength)
The peel strength (glass plate peel strength) (N) between the laminated foam sheet and the glass plate was measured as follows, first, 5 test pieces having dimensions of 60mm wide by 90mm long were cut out from the laminated foam sheet, and then the cut 5 test pieces were overlapped with 5 glass plates in a staggered manner and pressure-bonded under a load of 25g/cm 2 for 7 days, and then, the load when the test pieces pressure-bonded to the glass plates were peeled at a speed of 100mm/min was measured and taken as the peel strength (N), the arithmetic mean value of the values of the peel strength (N) when the respective test pieces were peeled was obtained and shown in table 2, and the peel strength was measured under 2 conditions of 25 ℃, 50% RH, 50 ℃ RH, and 80% RH.
(glass plate cleaning ability)
The evaluation test of the cleanability of the glass plate was carried out under 2 conditions of a normal temperature storage condition and a high temperature and high humidity storage condition in such a manner that the laminated foam sheet was stored in contact with the glass plate (load condition: 3.8g/cm 2) at a temperature of 25 ℃ and a humidity of 50% RH for 24 hours (normal temperature storage condition), then the laminated foam sheet was peeled off and the glass plate was washed, and the water contact angle with the contact surface of the laminated foam sheet in the surface of the glass plate was measured, and further, in a state where the laminated foam sheet was in contact with the glass plate, the laminated foam sheet was peeled off and the glass plate was washed after being stored at a temperature of 50 ℃ and a humidity of 80% RH for 24 hours (high temperature and high humidity storage condition), and then the laminated foam sheet was peeled off and the glass plate was washed, and the water contact angle with the contact surface of the laminated foam sheet in the surface of the glass plate was measured (measurement atmosphere condition: temperature of 25 ℃ and 50% humidity), and the measurement of the water contact angle was carried out using a contact meter 500R (kogaku) and then the amount of water contact angle liquid was measured, and then measured, and the sample was added to Inc 5.
The glass plate cleanliness was evaluated according to the following evaluation criteria based on the measurement results of the water contact angle of the glass plate after washing.
O (good glass plate cleaning): the water contact angle after cleaning is less than 10 °
x (poor cleaning of glass plate): the water contact angle after cleaning is more than 10 degrees
Comparative example 1
Using the obtained laminated foam sheet, the average thickness (mm), the apparent density (kg/m 3) of the foam layer, the surface resistivity (Ω), the water absorption rate (mass ppm), and the glass plate peel strength (N) were measured in the same manner as in example 1, and further, evaluation tests for glass plate cleanability were performed, the results are shown in table 2, and the obtained laminated foam sheet had high water absorption rate and poor glass cleanability under high-temperature and high-humidity conditions.
Comparative example 2
A laminated foam sheet was obtained in the same manner as in comparative example 1, except that the substance shown in table 2 was used as the first polyethylene glycol (PEG 1). Using the laminated foamed sheet obtained, the average thickness, the apparent density of the foamed layer, the surface resistivity, the water absorption rate, and the glass plate peel strength were measured in the same manner as in example 1. Further, an evaluation test of the cleanability of the glass plate was carried out. The results are shown in Table 2. The laminated foam sheet obtained had high water absorption rate under high-temperature and high-humidity conditions and poor glass cleanability as in comparative example 1.
Comparative example 3
A laminated foam sheet was obtained in the same manner as in example 1, except that the first polyethylene glycol (PEG1) was not used and only the second polyethylene glycol (PEG2) was used. Using the laminated foamed sheet obtained, the average thickness, the apparent density of the foamed layer, the surface resistivity, the water absorption rate, and the glass plate peel strength were measured in the same manner as in example 1. Further, an evaluation test of the cleanability of the glass plate was carried out. The results are shown in Table 2. The water absorption of the resulting laminated foam sheet was suppressed to be low, but the glass cleaning property was very poor.

Claims (9)

1. A polyolefin resin laminated foam sheet comprising a polyolefin resin foam layer and a polyolefin resin surface layer laminated and bonded to at least one surface side of the foam layer,
Polyethylene glycol (PEG) is blended in the surface layer,
The polyethylene glycol (PEG) is composed of a first polyethylene glycol (PEG1) which is liquid at 25 ℃ and a second polyethylene glycol (PEG2) which is solid at 25 ℃,
The amount of the first polyethylene glycol (PEG1) incorporated in the surface layer is 0.5 to 10 parts by mass, relative to 100 parts by mass of the polyolefin-based resin constituting the surface layer,
The amount of the second polyethylene glycol (PEG2) blended in the surface layer is 3 parts by mass or more with respect to 100 parts by mass of the amount of the first polyethylene glycol (PEG1) blended in the surface layer.
2. The polyolefin-based resin laminated foam sheet according to claim 1, wherein the first polyethylene glycol (PEG1) has a number average molecular weight of 100 to 800.
3. The polyolefin-based resin laminated foam sheet according to claim 1 or 2, wherein the number average molecular weight of the second polyethylene glycol (PEG2) is 2000 or more.
4. The polyolefin-based resin laminated foam sheet according to any one of claims 1 to 3, wherein the freezing point of the second polyethylene glycol (PEG2) is a temperature exceeding 50 ℃.
5. The polyolefin-based resin laminated foam sheet according to any one of claims 1 to 4, wherein the amount of the second polyethylene glycol (PEG2) blended in the surface layer is 3 parts by mass or more and 100 parts by mass or less with respect to 100 parts by mass of the amount of the first polyethylene glycol (PEG1) blended in the surface layer.
6. The polyolefin-based resin laminated foam sheet according to any one of claims 1 to 5, wherein the total blending amount of polyethylene glycol (PEG) is 15 parts by mass or less with respect to 100 parts by mass of the polyolefin-based resin constituting the surface layer.
7. The polyolefin-based resin laminated foam sheet according to any one of claims 1 to 6, wherein a polymer-based antistatic agent is blended in the surface layer in an amount of 2 parts by mass or more and 30 parts by mass or less with respect to 100 parts by mass of the polyolefin-based resin constituting the surface layer.
8. The polyolefin-based resin laminated foam sheet according to any one of claims 1 to 7,
The polyolefin resin constituting the foamed layer is low-density polyethylene,
The polyolefin-based resin constituting the surface layer is low-density polyethylene.
9. A sheet for glass plate made of the polyolefin resin laminated foam sheet according to any one of claims 1 to 8.
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