JP2004160868A - Sheet and recording material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet which has excellent printability, can be easily bonded to an object of every kind, for example, a synthetic resin plate, a decorative panel, a metal plate, a glass plate or the like, can be simply peeled and re-bonded even if the positional shift of the sheet is yielded, can be prevented from the lowering of visibility caused by the see-through of the color, pattern or background of a wall surface to which the sheet is bonded and leaves no stain on the side of the bonding object even after peeling. <P>SOLUTION: The sheet 2 has a film layer (A)4 containing a thermoplastic resin, the concealing layer (B)5 provided on one surface of the film layer (A) and the foamed resin layer (C)6 provided on the surface opposite to the film layer (A) of the concealing layer (B). When the sheet 2 is measured from the surface layer (A)4, the whiteness of the film of the sheet is not less than 80% and the total opacity thereof is not less than 98%. The total thickness of the sheet is 80-1,000 μm. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sheet excellent in printability, waterproofness, and light hiding properties, and a recorded matter on which the sheet is printed.
[0002]
[Prior art]
There is known a synthetic paper in which a biaxially stretched film of a thermoplastic resin is used as a base layer and a uniaxially stretched film of a thermoplastic resin containing inorganic fine powder is used as a paper-like layer (for example, see Patent Document 1).
[0003]
On the surface of the paper-like layer of this type of synthetic paper, in order to further improve offset printability, polyethyleneimine, a cationic or amphoteric acrylic polymer containing a tertiary or quaternary nitrogen atom, or A surface modifier composed of an aqueous solution such as an (ethylene / urea) polymer or an epichlorohydrin adduct of polyamide may be applied and dried. The synthetic paper having the multilayer structure has a high mechanical strength because the biaxially stretched film is used as the base layer. In addition, the paper-like layer has a large number of fine voids centered on inorganic fine powder due to stretching, is lightweight, has numerous fine cracks on its surface, and is excellent in ink absorbency and adhesion. For this reason, they are used as posters, maps, calendars, tracing papers, surface materials, catalogs, labels and the like that require durability.
[0004]
Further, a pearl-like synthetic paper in which a biaxially stretched film of a thermoplastic resin containing an inorganic fine powder is used as a paper-like layer has been proposed (for example, see Patent Document 2).
[0005]
Furthermore, a biaxially stretched film of a thermoplastic resin is used as a base layer (1a), and a surface layer (1b) and a back layer (1c) each composed of a uniaxially stretched thermoplastic resin containing 8 to 65% by weight of an inorganic fine powder. And a transparent film layer (2) of a thermoplastic resin containing no inorganic fine powder is provided on the surface layer (1b) side of the support, and a primer having an antistatic function. Synthetic paper provided with a coating layer (3) is also known (for example, see Patent Document 3).
[0006]
However, any of the synthetic papers described in Patent Literatures 1 to 3 is used by being attached to a wall with a thumbtack, being used with a double-sided tape, or being adhered to the entire surface when attaching and installing the printed matter. It is generally processed and used, and sticking and posting work is troublesome for any of them. The work involved in changing the installation location and posting and changing the attachment position was even more complicated.
[0007]
In addition, after attaching and posting the synthetic paper described in Patent Document 3 on the wall surface, when the synthetic paper is visually recognized, the color and pattern of the wall surface are seen through, and as a result, the visibility is reduced, There were inconveniences.
[0008]
Further, if a long time elapses after sticking using an adhesive, the viscosity of the adhesive may increase. For this reason, when the printed matter is to be peeled off due to a change in the installation location, the printed matter is pulled by the adhesive and breaks, and remains with the adhesive on the side to be pasted, or the printed matter can be removed successfully. However, the pressure-sensitive adhesive sometimes remains on the side to be stuck, and the appearance may be poor.
[0009]
In order to prevent the pressure-sensitive adhesive from remaining on the side to be adhered, a technique using a pressure-sensitive adhesive with little change in viscosity over time has been proposed (for example, see Patent Documents 4 and 5).
[0010]
However, even with the techniques described in Patent Documents 4 and 5, for example, the increase in viscosity of the pressure-sensitive adhesive cannot be completely suppressed, and the pressure-sensitive adhesive sometimes remains.
[0011]
[Patent Document 1] JP-A-57-181829
[Patent Document 2] US Pat. No. 3,775,521
[Patent Document 3] JP-A-61-3748
[Patent Document 4] JP-A-6-145616
[Patent Document 5] JP-A-7-18235
[Problems to be solved by the invention]
An object of the present invention is excellent in printability, for example, it can be easily adhered to various objects such as a synthetic resin plate, a decorative plate, a metal plate, and a glass plate. A sheet that can be attached, prevents a decrease in visibility due to the color, pattern, and background of the attached wall being seen through, and does not leave dirt on the side to be attached even after peeling, It is an object of the present invention to provide a recorded matter made of the sheet and a POP card made of the recorded matter.
[0012]
[Means for Solving the Problems]
The present inventors have excellent printability by laminating a film as a printing surface and a foamed resin layer as a sticking surface with a concealing layer interposed therebetween, so that the film is easily peeled off even if misalignment occurs. , A sheet that can be re-applied, prevents a decrease in visibility due to the color, pattern, or background of the attached wall being seen through, and does not leave dirt on the side to be adhered after peeling And completed the present invention.
[0013]
That is, according to the present invention,
A film layer (A) containing a thermoplastic resin,
A concealing layer (B) provided on one side of the film layer (A);
A sheet having a foamed resin layer (C) provided on the side of the concealing layer (B) opposite to the film layer (A),
The whiteness measured from the surface side of the film layer (A) is 80% or more;
The overall opacity is 98% or more,
The total thickness is 80 to 1000 μm
A sheet is provided.
[0014]
In the sheet of the present invention, the foamed resin layer (C) may be provided “on the side of the concealing layer (B) opposite to the film layer (A)”. This means that the foamed resin layer (C) may be provided directly on the concealing layer (B) or may be provided indirectly with an arbitrary layer interposed therebetween. ing.
[0015]
According to this invention, the whiteness, opacity and thickness of the entire sheet are controlled by laminating the specific film layer (A) and the foamed resin layer (C). Therefore, the printability is excellent. In the present invention, the foamed resin layer (C) is preferably made of a synthetic resin having a glass transition temperature of −50 to 0 ° C., and has 100 to 1000 depressions / mm having a diameter of 5 to 100 μm on the surface.²By having it at a ratio of, it can be easily attached to various objects, and even if misalignment occurs, it can be easily peeled and re-applied, and even after peeling, dirt on the side to be adhered Does not remain. Further, in the present invention, the opacity of the entire sheet is further controlled by interposing the concealing layer (B) between the specific film layer (A) and the foamed resin layer (C). For this reason, it is possible to effectively prevent a decrease in visibility due to the see-through color, pattern, or background of the attached wall surface.
[0016]
Preferably, the sheet according to the present invention has a total light transmittance of 5% or less.
[0017]
Preferably, the film layer (A) has an opacity of 85% or more.
[0018]
Preferably, the film layer (A) has a thickness of 20 to 900 μm.
[0019]
Preferably, the film layer (A) has a porosity of 10 to 60%.
[0020]
Preferably, the film layer (A) includes a stretched layer.
[0021]
Preferably, it has a coating layer (X) having printing characteristics laminated on the surface of the film layer (A).
[0022]
Preferably, a second film layer (D) containing a thermoplastic resin is provided between the concealing layer (B) and the foamed resin layer (C).
[0023]
Preferably, the thermoplastic resin contained in the film layer (A) or the film layer (D) contains a polyolefin resin or a polyester resin.
[0024]
Preferably, the foamed resin layer (C) is made of a synthetic resin having a glass transition temperature of −50 to 0 ° C., and has 100 to 1000 depressions / mm having a diameter of 5 to 100 μm on the surface.²In the ratio of In the present invention, since the suction action is exerted by the recessed holes of the foamed resin layer (C), the film layer (A) and the concealing layer (B) are provided on the surface to be stuck via the foamed resin layer (C). Can be attached. Since the foamed resin layer (C) is not composed of an adhesive, the viscosity does not change with time, and the foamed resin layer remains on the sticking target side even after the film layer (A) and the concealing layer (B) are removed. (C) does not remain. As a result, dirt does not remain on the sticking target side.
[0025]
The sheet according to the present invention may be wound and stored such that the film layer (A) is positioned on the outer surface while the foamed resin layer (C) is in contact with the core material. A peelable release film (Y) may be laminated on the surface of (C) and stored. That is, the sheet of the present invention may have a release film (Y) releasably laminated on the surface of the foamed resin layer (C).
[0026]
According to the present invention, there is provided a recorded matter printed on the film layer (A) of any of the above sheets. When the coat layer (X) is formed on the film layer (A), printing is performed on the coat layer (X).
[0027]
According to the present invention, there is provided a POP card including the recorded matter.
[0028]
According to the recorded matter and the POP card according to the present invention, by using the foamed resin layer (C) as the sticking surface, it can be easily stuck to various objects, and can be easily peeled and re-attached even if a positional shift occurs. Adhesion is possible, and no dirt remains on the application target side even after peeling.
[0029]
The sheet, the recorded matter, and the POP card according to the present invention are not particularly limited, and examples thereof include a synthetic resin plate (for example, an acrylic plate), a decorative plate (for example, a wall surface), a metal plate, and a glass plate.
[0030]
In addition, “to” in this specification means that numerical values described before and after that are included as the lower limit and the upper limit. “Whiteness” as used herein means whiteness measured in accordance with the method described in JIS-L1015. "Opacity" as used herein means opacity measured using a light source mainly composed of blue light having a wavelength of 450 nm to 500 nm according to the method described in JIS-P8138. The term “total light transmittance” as used herein means the average value of the transmittance at each wavelength measured in the wavelength range of 400 nm to 700 nm according to the method described in JIS-Z8701. That is, the opacity and the total light transmittance have different wavelengths of the measurement light source. Therefore, even if the opacity is 98% or more (for example, 100%), the total light transmittance may exceed 5%. As used herein, the term “porosity” means a value obtained by cutting out a cross section of a film, observing the cross section with an electron microscope, and measuring the area ratio (%) occupied by pores in that region.
[0031]
BEST MODE FOR CARRYING OUT THE INVENTION
Sheet
The sheet according to the present invention includes a film layer (A) containing a thermoplastic resin, a concealing layer (B) provided on one side of the film layer (A), and a concealing layer (B) directly or indirectly provided on the concealing layer (B). And a foamed resin layer (C).
[0032]
The sheet according to the present invention has a whiteness of at least 80%, preferably at least 85%, measured from the surface side of the film layer (A). By setting the whiteness of the film layer (A) surface side to 80% or more, the content printed and recorded on the sheet can be easily distinguished.
[0033]
The sheet according to the present invention has an overall opacity of 98% or more. By setting the overall opacity to 98% or more, it is possible to effectively prevent the color and pattern of the wall surface on which the sheet is adhered from being seen through, and as a result, the content printed and recorded on the sheet is determined. It can be easier.
[0034]
The sheet according to the present invention has an overall thickness of 80 to 1000 μm, preferably 100 to 800 μm. By setting the total thickness to 80 μm or more, it is possible to make it difficult for wrinkles to be formed in the film layer at the time of sticking. By setting the total thickness to 1000 μm or less, it is possible to prevent the stiffness from becoming too strong, and to reduce the weight of itself to prevent falling off during sticking use.
[0035]
The sheet according to the present invention preferably has a total light transmittance of 5% or less, more preferably 2% or less, and particularly preferably 0 to 0.5%. By setting the total light transmittance of the entire sheet to 5% or less, it is possible to more effectively prevent the color and pattern of the wall surface to which the present sheet is adhered from being seen through, and as a result, printing and recording on the present sheet are performed. It is possible to make it easy to determine the contents of the information.
[0036]
Film layer containing thermoplastic resin (A)
The opacity of the film layer containing the thermoplastic resin of the present invention (hereinafter sometimes simply referred to as a film layer) (A) is preferably 85% or more, more preferably 90 to 100%. is there. By setting the opacity of the film layer (A) itself to 85% or more, the coloring of the concealing layer (B) described later is prevented from being seen through, so that the content printed and recorded on the sheet can be more easily determined. can do.
[0037]
The film layer (A) preferably has a thickness of 20 to 900 μm, more preferably 30 to 800 μm. By setting the thickness of the film layer (A) itself to 20 μm or more, the mechanical strength of the entire sheet of the present invention can be improved, and thus a large-area poster or the like can be formed. By setting the thickness of the film layer (A) itself to 900 μm or less, it is possible to prevent the stiffness of the entire sheet of the present invention from becoming too strong, and to reduce its own weight to prevent the sheet from falling off at the time of sticking use. .
[0038]
The film layer (A) may contain pores. The porosity in this case is preferably from 10 to 60%, more preferably from 15 to 55%. By setting the porosity of the film layer (A) itself to 10% or more, the opacity of the film layer (A) itself can be increased, and the coloring of the concealing layer (B) described later can be seen through. As a result, the content printed and recorded on the sheet can be more easily determined. By setting the porosity of the film layer (A) itself to 60% or less, a decrease in the surface strength of the film layer (A) can be prevented, and dents and wrinkles hardly occur.
[0039]
Although it does not specifically limit as a film layer (A), it can comprise the thing which made the compound which contains a thermoplastic resin and one or both of an inorganic fine powder and an organic filler into a film.
[0040]
Examples of the thermoplastic resin include polyethylene resins such as low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, and high-density polyethylene, polypropylene resins, polyolefins such as polymethyl-1-pentene, and ethylene-cycloolefin copolymers. Resin; Polyamide resin such as nylon 6, nylon 6,6, nylon 6,10; Polyester resin such as polyethylene terephthalate and its copolymer, polyethylene naphthalate, aliphatic polyester; Polycarbonate, atactic polystyrene, syndiotactic polystyrene And polyphenylene sulfide. These may be used in combination of two or more. Among these, polyolefin resins and polyester resins are preferred. Among the polyolefin resins, a polypropylene resin is preferred. Examples of the polypropylene resin include a propylene homopolymer and a copolymer of propylene, which is a main component, with an α-olefin such as ethylene, 1-butene, 1-hexene, 1-heptene, and 4-methyl-1-pentene. Is mentioned. The stereoregularity is not particularly limited, and isotactic or syndiotactic and those exhibiting various degrees of stereoregularity can be used. The copolymer may be a binary, ternary or quaternary system, and may be a random copolymer or a block copolymer.
[0041]
Examples of the inorganic fine powder include calcium carbonate, calcined clay, silica, diatomaceous earth, talc, mica, synthetic mica, sericite, kaolinite, titanium oxide, barium sulfate, and alumina. Among them, calcium carbonate and barium sulfate are preferred. These may be used alone or in combination of two or more.
[0042]
As the organic filler, it is preferable to select a resin of a type different from the above-described thermoplastic resin as the main component. For example, when the thermoplastic resin as the main component described above is a polyolefin-based resin, as the organic filler, polyethylene terephthalate, polybutylene terephthalate, polycarbonate, nylon 6, nylon 6,6, a homopolymer or cyclic olefin of cyclic olefin and Copolymers with ethylene having a melting point of 120 to 300 ° C or a glass transition temperature of 120 to 280 ° C are exemplified. When the above-mentioned thermoplastic resin is a polyester resin, as the organic filler, polystyrene, polycarbonate, nylon-6, nylon-6,6, polymethyl-1-pentene, a homopolymer of cyclic olefin or a mixture of cyclic olefin and ethylene Copolymers having a melting point of 120 to 300 ° C. or a glass transition temperature of 120 to 280 ° C. are exemplified. These organic fillers may be used alone or in combination of two or more.
[0043]
The total content of the inorganic fine powder and the organic filler in the film layer (A) is preferably from 8 to 65% by weight, more preferably from 10 to 60% by weight. When the total content is in the range of 8 to 65% by weight, the whiteness and opacity of the film layer (A) itself can be balanced.
[0044]
The film layer (A) may optionally contain other compounding agents such as an antioxidant, a light stabilizer, a dispersant, and a lubricant. Examples of the antioxidant include sterically hindered phenol-based, phosphorus-based, and amine-based agents. The compounding amount is usually about 0.001 to 1% by weight in the film layer (A).
[0045]
Examples of the light stabilizer include sterically hindered amines, benzotriazoles, and benzophenones. The compounding amount is usually about 0.001 to 1% by weight in the film layer (A).
[0046]
Examples of the dispersant for the inorganic fine powder include a silane coupling agent, higher fatty acids such as oleic acid and stearic acid, metal soap, polyacrylic acid, polymethacrylic acid, and salts thereof. The compounding amount is usually about 0.01 to 4% by weight in the film layer (A).
[0047]
As a method of forming a film of a composition containing a thermoplastic resin and one or both of an inorganic fine powder and an organic filler, a general molding method is used, for example, a single layer connected to a screw-type extruder. Or, a cast molding method in which a molten resin is extruded into a film using a multi-layer T-die or I-die, or a uniaxial stretching method in which this cast film is longitudinally stretched and formed using a peripheral speed difference between rolls. Examples include a biaxial stretching method in which the stretched film is further laterally stretched using a tenter oven, and a simultaneous biaxial stretching method using a combination of a tenter oven and a linear motor.
[0048]
The stretching temperature at the time of stretching is a temperature 2 to 60 ° C. lower than the melting point of the thermoplastic resin to be used. When the resin is a propylene homopolymer (melting point: 155 to 167 ° C.), the stretching temperature is 152 to 164 ° C. When the melting point is 121 to 134 ° C., 110 to 120 ° C. is preferable. The stretching speed is preferably from 20 to 350 m / min.
[0049]
The film layer (A) may have a single-layer structure or a multilayer structure. In the case of a single layer structure, the film may be non-stretched, uniaxially stretched, or biaxially stretched. In the case of a multilayer structure, it may have a two-layer structure, a three-layer structure or more. In the case of a two-layer structure, any structure of non-stretching / uniaxial stretching, non-stretching / biaxial stretching, monoaxial stretching / uniaxial stretching, uniaxial stretching / biaxial stretching, biaxial stretching / biaxial stretching, No problem. In the case of a structure having three or more layers, the single-layer structure and the two-layer structure may be combined, and any combination may be used. The lamination method having a two-layer structure or more can be performed by a known method such as coextrusion or lamination.
[0050]
Concealment layer (B)
The concealing layer (B) of the present invention is a layer having the smallest visible light transmittance per unit thickness among all layers constituting the sheet according to the present invention, and the total light at a light wavelength of 400 to 700 nm. The transmittance (based on JIS-Z8701) is preferably 0.5% or less.
[0051]
The method of forming the concealing layer (B) on the film layer (A) is not particularly limited. For example, (1) offset printing, gravure printing, or screen printing is directly performed on the surface of the film layer (A). It may be formed by performing black solid printing with a thickness of 1 μm or more. Further, (2) transfer of a metal vapor-deposited foil such as aluminum by stamping, transfer vapor deposition, and direct vapor deposition may be performed so as to have a thickness of about 500 nm. (3) When bonding the film layer (A) and a second film layer (D) described later using an adhesive, the adhesive contains a black filler such as carbon black or an oxidant. A large amount of white filler such as titanium whisker, titanium oxide fine particles, etc.²It may be formed by coating as described above.
[0052]
The thickness of the concealing layer (B) is not particularly limited, but is preferably 1 μm or more, and more preferably 1.5 to 10 μm when (1) formed by solid black printing. (2) When it is formed using a metal-deposited foil, the thickness is preferably 100 nm or more, more preferably 200 to 1000 nm. (3) The coating thickness of the adhesive when various fillers are contained in the adhesive is preferably 2 g / m²Or more, more preferably 3 to 10 g / m²It is.
[0053]
If the thickness of the concealing layer (B) is too thin, the color or pattern of the wall surface to which the present sheet is adhered may be seen through, and as a result, it may be difficult to determine the content printed and recorded on the present sheet. . If the thickness of the concealing layer (B) is too large, it is uneconomical in cost.
[0054]
Foam resin layer (C)
The foamed resin layer (C) of the present invention preferably has a recessed hole as shown in, for example, FIGS. 1 and 2 on its surface (the outer surface opposite to the surface in contact with the concealing layer (B)). . 1 and 2, reference numeral 2 represents a sheet, reference numeral 4 represents a film layer (A), reference numeral 5 represents a concealing layer (B), reference numeral 6 represents a foamed resin layer (C), and reference numeral 62. Indicates a depression.
[0055]
The depressed hole is formed by air bubbles in the foamed resin layer (C) appearing on the surface, and functions as a micro suction cup. The shape of the depression is generally a part of a sphere cut in a plane. The diameter and depth of the depression are determined by the diameter of the bubble. The diameter of the recessed hole has a distribution even if the diameter of the bubble is constant, for example, because it differs depending on the position of the center from the surface of the foamed resin layer (C). The foamed resin layer (C) used in the present invention preferably has a depression having a diameter of 5 to 100 μm on its surface. The number of the depressions is the unit area (1 mm²), Preferably from 100 to 1000, more preferably from 200 to 400. In particular, of the recessed holes having a diameter of 5 to 100 μm, those having a diameter of 10 to 50 μm are preferably 50% or more, and more preferably 80% or more. Further, those having a size of 20 to 30 μm are more preferably 80% or more. If there are many depressions with a small diameter, the adsorbability as a micro suction cup is inferior. Conversely, if there are many depressions with a large diameter, uniform adsorption may not be achieved. On the other hand, if the number of recessed holes per unit area is too small, the adsorbability is poor. When the bubbles are closed cells, the distribution of the depth of the depression is almost the same as the distribution of the diameter of the depression.
[0056]
The foamed resin layer (C) is made of a synthetic resin. As the synthetic resin constituting the foamed resin layer (C), a synthetic resin having a glass transition temperature (Tg) of −50 to 0 ° C. (preferably −45 to −10 ° C., more preferably −40 to −25 ° C.) It is desirable that By using a soft synthetic resin having a low Tg, a foamed resin layer (C) capable of exhibiting adsorptivity can be formed. Examples of the synthetic resin having a Tg of −50 to 0 ° C. include an acrylic resin, a polyethylene resin, a vinyl chloride resin, and a urethane resin. Above all, an acrylic resin is preferable, and a (meth) acrylate polymer is more preferably contained. The (meth) acrylate-based polymer preferably contains 50% by weight or more, more preferably 70% by weight or more, of a repeating unit derived from a (meth) acrylate-based monomer in all repeating units. The (meth) acrylate-based polymer may be a homopolymer or a copolymer of two or more components.
[0057]
The foamed resin layer (C) may be formed as a single layer or as a multilayer.
[0058]
The thickness of the foamed resin layer (C) may be adjusted according to the application, and is preferably 25 to 500 µm, more preferably 50 to 300 µm. If the thickness is too small, the diameter of the closed cells becomes too large relative to the thickness. Alternatively, a plurality of bubbles are integrated into a continuous bubble. As a result, they do not become depressed holes, tend to be through holes, and may have poor adsorbability. On the other hand, if it is too thick, foaming may not occur uniformly and may not be adsorbed uniformly.
[0059]
Lamination method
The method of laminating the foamed resin layer (C) on the surface of the concealing layer (B) is not particularly limited. For example, (1) the foamed resin layer (C) and the concealing layer (B) which have been manufactured in advance may be used. (2) preparing a synthetic resin solution containing a foaming agent, applying the solution to the surface of the concealing layer (B), and then foaming the synthetic resin. (3) A synthetic resin emulsion is prepared, and a gas is blown into this emulsion to generate fine bubbles, which are then applied to the surface of the concealing layer (B), and then dried to remove moisture. Method, and the like.
[0060]
The production of the foamed resin layer (C) in the case of (1) is carried out in a synthetic resin solution containing the foaming agent used in (2) on a smooth and easily peelable plane or in the emulsion liquid used in (3). It can be carried out by applying a liquid into which gas has been blown and drying it. Examples of the adhesive usable in (1) include a urethane-based adhesive and an acrylic-based adhesive. The thickness of the adhesive layer is preferably 50 μm or less, more preferably 20 μm or less. If the thickness is too large, the sheet becomes too hard, so that it is difficult to attach the sheet. Examples of the foaming agent in the case (2) include an azo foaming agent and sodium bicarbonate. The addition amount is usually about 1 to 10 parts by weight based on 100 parts by weight of the synthetic resin. In the cases (2) and (3), the size and amount of the generated bubbles are controlled by the amount of the foaming agent and the air to be blown, the processing temperature, and the like, so that the diameter and the number of the recessed holes on the surface fall within the above ranges. It may be controlled so that
[0061]
Among them, the method (3) is preferable. In the following description, the case of the method (3) using an acrylic emulsion is exemplified.
[0062]
An acrylic emulsion that can be used contains a (meth) acrylate-based polymer. The content of the (meth) acrylate-based polymer in the acrylic emulsion is preferably from 10 to 90% by weight, more preferably from 20 to 80% by weight in terms of solid content. The average particle size of the polymer particles is preferably 0.05 to 10 μm, more preferably 0.1 to 2 μm.
[0063]
Examples of the (meth) acrylate-based monomer that can be used for producing the (meth) acrylate-based polymer include methyl methacrylate (105 ° C.) other than methyl methacrylate (105 ° C.) which is highly versatile and easily available. ), Ethyl acrylate (−22 ° C.), n-propyl acrylate (−52 ° C.), n-butyl acrylate (−54 ° C.), isobutyl acrylate (−24 ° C.), n-octyl acrylate (−65 ° C.), 2- Ethylhexyl acrylate (-85 ° C), n-lauryl acrylate (15 ° C), n-tetradecyl acrylate (20 ° C), methoxyethyl acrylate (-85 ° C), ethoxyethyl acrylate (-50 ° C), cyclohexyl acrylate (15 ° C) ), Acrylates such as benzyl acrylate (6 ° C.); Methacrylates such as mill methacrylate (10 ° C), n-octyl methacrylate (-20 ° C), n-decyl methacrylate (-65 ° C), n-lauryl methacrylate (-65 ° C), n-cetyl methacrylate (15 ° C); And the like. The numbers in the parentheses indicate the Tg of the homopolymer obtained using the monomer. These (meth) acrylate monomers can be used alone or in combination of two or more as appropriate. Finally, a polymerizable monomer may be selected so as to obtain a desired Tg.
[0064]
In the present embodiment, in addition to the (meth) acrylate monomer described above, for example, aromatic vinyl compounds such as styrene, vinyltoluene, and α-methylstyrene; unsaturated nitriles such as (meth) acrylonitrile and vinylidene cyanide And other monomers such as 2-hydroxyethyl fumarate, hydroxybutyl vinyl ether, monobutyl maleate, glycidyl methacrylate and butoxyethyl methacrylate may be used in combination. The content of other monomers in the total polymerizable monomer may be preferably 50% by weight or less, more preferably 30% by weight or less.
[0065]
The acrylic emulsion that can be used in the present invention can be produced by an emulsion polymerization method, a seeded emulsion polymerization method, a fine suspension polymerization method, or the like.
[0066]
The generation of fine bubbles in the acrylic emulsion can be performed, for example, by blowing a gas into the emulsion at a rate of 0.1 to 5 liters / minute using a continuous foaming machine.
[0067]
As a method of applying the acrylic emulsion in which fine bubbles are generated to the surface of the concealing layer (B), for example, a comma coater, a reverse coater, or the like can be used. The drying temperature is preferably from 60 to 120C, more preferably from 80 to 100C. If the drying temperature is too high or too low, the size of the bubbles is too large or too small, so that the adsorbing power may be insufficient. The drying time is usually about 3 to 10 minutes.
[0068]
Second film layer (D)
A second film layer (D) containing a thermoplastic resin is provided between the concealing layer (B) and the foamed resin layer (C) in order to adjust the stiffness and texture of the sheet according to the present invention. May be. The second film layer (D) may be composed of the same material as the above-mentioned film layer (A), or may be composed of a general thermoplastic resin in addition thereto. The appearance of the second film layer (D) may be transparent or opaque. It may be colorless or colored. Further, a printed pattern may be partially or entirely provided.
[0069]
Laminated structure
The concealing layer (B) used in the present invention only needs to be laminated on the surface of the film layer (A), and other layers may be interposed as long as the object of the present invention is not impaired. Further, the foamed resin layer (C) used in the present invention only needs to be laminated on the surface of the concealing layer (B), and is laminated after the above-described second film layer (D) is interposed therebetween. Further, other layers may be interposed therebetween as long as the object of the present invention is not impaired.
[0070]
That is, the sheet according to the present invention only needs to have the film layer (A), the concealing layer (B), and the foamed resin layer (C) laminated in this order. As such an example, for example, a three-layer structure of film layer (A) / concealing layer (B) / foamed resin layer (C), film layer (A) / concealing layer (B) / film layer (A) / A four-layer structure of a foamed resin layer (C), a four-layered structure of a film layer (A) / concealing layer (B) / second film layer (D) / foamed resin layer (C), and the like can be given.
[0071]
Here, a common adhesive is used for lamination of the film layers (A) or lamination of the film layer (A) and the second film layer (D) via the concealing layer (B). It can be interposed. Examples of the adhesive usable here include a liquid anchor coating agent, and examples of the polyurethane anchor coating agent include EL-150 (trade name) of Toyo Morton Co., Ltd. or a mixture of BLS-2080A and BLS-2080B. . Examples of the polyester-based anchor coating agent include AD-503 (trade name) of the company. Anchor coating agent is 0.5 to 25 g / m²It is preferably applied so that
[0072]
As the adhesive, hot melt adhesives such as ethylene-vinyl acetate copolymer, low-density polyethylene, metal salt of ethylene- (meth) acrylic acid copolymer (so-called Surlyn), chlorinated polyethylene, and chlorinated polypropylene are used. It is preferable to use a thermoplastic resin having a melting point lower than the stretching temperature at the time of manufacturing the film layer (A) and / or the second film layer (D). If the hot melt adhesive is used at a temperature higher than the stretching temperature, the film layer (A) and / or the second film layer (D) may shrink.
[0073]
When bonding with the anchor coating agent, an anchor coating agent was applied to one or both surfaces of the film layer (A) and the second film layer (D), and the concealing layer (B) was interposed therebetween. Then, it is sufficient to apply pressure bonding with a roll. When a hot melt adhesive is used, a concealing layer (B) is formed on one of the film layers (A) and the second film layer (D). After extruding into a molten film form from a die and laminating, the other film layer of the film layer (A) and the second film layer (D) may be bonded with a pressure roll. Alternatively, after laminating a molten adhesive film on one of the film layers (A) and the second film layer (D), a concealing layer (B) is interposed on the adhesive film. After that, the other film layer of the film layer (A) and the second film layer (D) may be laminated, and may be bonded by pressing with a roll.
[0074]
Release film (Y)
In order to prevent the sheet according to the present invention from adhering to a surface other than the surface to be adhered, usually, as shown in FIG. 3, a film layer is applied to the outer surface while the foamed resin layer (C) is brought into contact with the core material. It is wound up and stored so that (A) is positioned. Reference numeral 10 in FIG. 3 represents a core material, reference numeral 4 represents a film layer (A), and reference numeral 6 represents a foamed resin layer (C). In FIG. 3, the concealing layer (B) is not shown. However, in this case, wrinkles may be a problem. In this case, a release film (Y) may be laminated and stored on the surface of the foamed resin layer (C) so as to be peelable, as shown in FIG. 4, for example. Reference numeral 20 in FIG. 4 represents a release film (Y).
[0075]
The release film (Y) is preferably made of a stretchable material, and examples thereof include preferably stretchable polyethylene films, vinyl chloride films, and polymethylpentene films. When a release film (Y) made of such a stretchable resin film is laminated, even when the sheet according to the present invention is wound up and stored, it becomes difficult to cause winding wrinkles.
[0076]
The thickness of the release film (Y) is preferably 10 to 100 μm, more preferably 12 to 50 μm, and particularly preferably 15 to 35 μm. If the thickness of the release film (Y) is too thin, the film may be broken when the release film (Y) is peeled off. Conversely, if the thickness is too large, the sheet may be wound up with the release film (Y) for storage or transportation. Or wrinkles may occur.
[0077]
Recorded matter
In the present invention, for example, the film layer (A) of the sheet according to the present invention is subjected to printing by offset printing, seal printing, flexographic printing, silk screen printing, gravure printing, laser printer, thermal transfer printer, inkjet printer, or the like. Thereby, the recorded matter according to the present invention can be manufactured. Reference numeral 100 in FIG. 5 represents a recorded matter, and reference numeral 30 represents printing.
[0078]
The recorded matter according to the present invention can be used for sales promotion cards, so-called POP cards (posters, stickers, displays, etc.), underlays (for lunch mats, table mats, stationery, etc.), hamburgers, sushi, baked buckwheat, etc. Menus, catalogs, panels, plates (replacement of metal plates), bromide, store price lists, information boards (sales counters, directions / destinations, sweets / food, etc.), horticultural POPs (insert labels, etc.), road signs (Such as funeral homes and exhibition places), signboards (such as off-limits, forest road work, etc.), calendars (with images), simple whiteboards, mouse pads, coasters, alternatives to label writers, adhesive labels, etc. It is possible.
[0079]
The recorded matter according to the present invention can be used by laminating it on at least a part of the surface to be stuck. The method for laminating the recorded matter of the present invention on the surface to be adhered is not particularly limited. For example, in the case where the release film (Y) is not laminated on the foamed resin layer (C) of the recorded matter and is wound up as shown in FIG. Then, the recorded matter may be laminated via the foamed resin layer (C). Further, as shown in FIG. 4, when a release film (Y) is laminated on the foamed resin layer (C) of the sheet, after the release film (Y) is peeled off, the foamed resin layer (C) is removed. May be brought into contact with the surface of the object to be attached, and the recorded matter may be laminated.
[0080]
The object to which the recorded matter according to the present invention is adhered is not particularly limited, and examples thereof include a synthetic resin plate (for example, an acrylic plate), a decorative plate (for example, a wall surface), a metal plate, and a glass plate.
[0081]
Other embodiments
As described above, the embodiments of the present invention have been described. However, the present invention is not limited to these embodiments at all, and it goes without saying that the present invention can be implemented in various modes without departing from the gist of the present invention. .
[0082]
For example, a coat layer (X) may be provided on the surface of the film layer (A) so as to have printability by the above-described various printings, as long as the whiteness and the opacity are not inconvenient. In this case, a recorded matter can be produced by performing the above printing on the coat layer (X) on the film layer (A).
[0083]
Further, as long as the object of the present invention is not impaired, the structure may further have other layers other than the film layer (A), the concealing layer (B) and the foamed resin layer (C).
[0084]
【Example】
Hereinafter, the present invention will be described based on more detailed examples, but the present invention is not limited to these examples. Percentages are by weight unless otherwise indicated.
[0085]
Example 1
First, a film layer (A) containing a thermoplastic resin was prepared as shown below.
[0086]
74% of propylene homopolymer (Novatec PP: MA4, manufactured by Nippon Polychem Co., Ltd.), 10% of high-density polyethylene (Novatec HD: HJ360, manufactured by Nippon Polychem Co., Ltd.) and 16% of calcium carbonate (Softon 1800, manufactured by Bihoku Powder Chemical Industry Co., Ltd.) Was melt-kneaded at 250 ° C., supplied to a die set at 250 ° C., extruded into a sheet, and cooled by a cooling roll to obtain a non-stretched sheet. The obtained unstretched sheet was heated to 135 ° C. and stretched in the machine direction at a magnification of 4 times to obtain a base material layer (b). Next, 52% of propylene homopolymer (Novatec PP: EA8, manufactured by Nippon Polychem Co., Ltd.), 3% of high-density polyethylene (Novatec HD: HJ360, manufactured by Nippon Polychem Co., Ltd.) and calcium carbonate (Softon 1800, manufactured by Bihoku Powder Chemical Industry Co., Ltd.) ) 45% each was melt-kneaded at 250 ° C by a separate extruder, and then supplied to a die set at 250 ° C and extruded into a sheet, and the above-mentioned base material layer was formed as a surface layer (a) and a backside layer (c). (B) was laminated on both sides and cooled to 60 ° C. to obtain a laminated film (a / b / c) having a three-layer structure. Next, the obtained three-layer laminated film was heated again to 180 ° C. and stretched in a transverse direction at a magnification of 9 times with a tenter. Then, after annealing at 160 ° C., it is cooled to 60 ° C., slits are formed in the ears, and a thermoplastic resin comprising a multilayer resin stretched film having a thickness of 60 μm (a / b / c = 12 μm / 36 μm / 12 μm) is removed. The resulting film layer (A) was obtained.
[0087]
The opacity, thickness, and porosity of the obtained film layer (A) were measured. The opacity was measured according to the method described in JIS-P8138. The porosity was determined by cutting out a cross section of the film, observing it with an electron microscope, and measuring the area ratio (%) occupied by vacancies in that region. As a result, the opacity of the film layer (A) was 87%, the thickness of the film layer (A) was 60 μm, and the porosity of the film layer (A) was 32%.
[0088]
Next, a corona discharge is applied to the entire surface of the film layer (A) containing the obtained thermoplastic resin-containing film layer (A) on the back surface layer (c) side, and black solid color printing (thickness: 2 μm) is performed by gravure printing. (B) was formed.
[0089]
Next, a foamy acrylic emulsion liquid (manufactured by Dainippon Ink and Chemicals, Inc., acrylic resin Tg: -35, produced by blowing air mechanically over the entire surface of the formed concealing layer (B)) C.) with a comma coater, and dried at a constant temperature rising rate from 80 ° C. to 120 ° C. for 6 minutes to form an acrylic resin layer having a thickness of 144 μm as a foamed resin layer (C). Obtained. The structure of the obtained sheet was a three-layer structure of a film layer (A) / concealing layer (B) / foamed resin layer (C).
[0090]
In addition, the glass transition temperature of the resin was measured by a differential scanning calorimeter (DSC) at a heating rate of 10 ° C./min. Observation of the surface of the acrylic resin layer with an optical microscope revealed that a depression having a diameter of 5 to 100 μm was 1 mm in the acrylic resin layer.²It was confirmed that about 300 of them existed in each case.
[0091]
The opacity, whiteness, and total light transmittance of the sheet thus obtained were measured from the surface layer (a) side of the film layer (A). In this case, the total light transmittance was measured so that the incident light of the measuring instrument was irradiated on the surface layer (a) side of the film layer (A). As a result, the opacity measured from the surface layer (a) side of the film layer (A) was 100%, the whiteness was 88%, and the total light transmittance was 0.4%. The thickness of the entire sheet was 206 μm.
[0092]
Next, after performing corona discharge on the surface layer (a) of the film layer (A) of the obtained sheet, a hamburger pattern was applied by UV offset printing in four colors to obtain a recorded matter.
[0093]
Image sharpness
The obtained recorded matter was cut into an A3 size, stuck on a wall surface having embossed irregularities and printed with a floral pattern, and the sharpness of a printed image was evaluated according to the following criteria. ：: The lining wall surface was clear without see-through, and X: the lining wall surface was see-through and unclear. The result was ○.
[0094]
Initial adsorption force and change with time of adsorption force
Two test pieces of 250 mm long × 25 mm wide were cut out from the obtained recorded matter.
[0095]
The initial adsorption force of one test piece was measured. For measurement of the initial adsorption force, the foamed resin layer (C) side of the test piece was subjected to various types of objects to be bonded (glass plate, aluminum plate, SUS304 plate, polyester film A having a sand-matted surface, polyester film B having no surface treatment) ), A 180 ° C. peel test was performed according to JIS-Z0237, and the attraction force was measured. The crosshead speed was 300 mm / min, and the load cell was 10 kgf. As a result, the values were 0.03 N / cm for a glass plate, 0.03 N / cm for an aluminum plate, 0.02 N / cm for a SUS304 plate, and 0.02 N / cm for a polyester film A. 0.02 N / cm and an initial adsorption force of 0.06 N / cm for the polyester film B were confirmed, and it was confirmed that a good initial adsorption force was obtained for any of the objects to be stuck.
[0096]
After the test piece was allowed to stand for one week in a constant temperature and humidity room at a temperature of 23 ° C. and a humidity of 50%, the adsorption force was measured in the same manner as described above, and the change over time in the adsorption force of the foamed resin layer (C) was evaluated. As a result, the adsorption force did not change with time for any of the glass plate, aluminum plate, SUS304 plate, polyester film A, and polyester film B.
[0097]
Surface contamination status
The foamed resin layer (C) of the test piece was brought into contact with the surface of a glass plate to be adhered, and was pressed with a pressure of 160 Pa and adhered. Two such samples were prepared.
[0098]
One of the obtained samples was left for one week in an environment of a temperature of 23 ° C. and a humidity of 50%, and then the film layer (A) was peeled off from the glass plate, and then the surface contamination state of the glass plate was evaluated. The state of surface contamination was visually evaluated, and the foamed resin layer (C) was evaluated as remaining: 残存: none, Δ: slightly, ×: present. The result was ○.
[0099]
Example 2
As in Example 1, the entire surface of the back layer (c) side of the film layer (A) containing a thermoplastic resin composed of a multilayer resin stretched film having a thickness of 60 μm (a / b / c = 12 μm / 36 μm / 12 μm) is formed. Then, a corona discharge was performed and gravure printing was performed to perform black solid one-color printing (thickness: 2 μm) to form a concealing layer (B). Next, a polyurethane-based anchor coating agent (a mixture of BLS-2080A and BLS-2080B, manufactured by Toyo Morton Co., Ltd.) was applied to the entire surface of the concealing layer (B) at 4 g / m.²Is applied so as to have a solid content of 60 μm (a / b / c = 12 μm / 36 μm / 12 μm) and separately prepared on the anchor coat agent. The surface layer (a) side of the film layer (A) made of a stretched film was bonded using a pressure roll. Next, a foamed resin layer (C) was formed in the same manner as in Example 1 on the back layer (c) side of the film layer (A) that was bonded later, and a sheet was produced. The structure of the obtained sheet was a four-layer structure of film layer (A) / concealing layer (B) / film layer (A) / foamed resin layer (C).
[0100]
The opacity, whiteness, total light transmittance and total light transmittance of the obtained sheet were measured in the same manner as in Example 1 from the surface layer (a) side of the film layer. As a result, the opacity measured from the surface layer (a) side of the film layer (A) was 100%, the whiteness was 88%, and the total light transmittance was 0.3%. The thickness of the entire sheet was 268 μm.
[0101]
Next, the same pattern as in Example 1 was applied on the surface of the film layer (A) of the obtained sheet by four-color printing, and the sharpness of the image of the obtained recorded matter was evaluated. The result was ○.
[0102]
Comparative Example 1
A sheet was obtained in the same manner as in Example 1 except that the film layer (A) containing a thermoplastic resin produced as described below was used.
[0103]
A film layer (A) containing a thermoplastic resin composed of a multilayer resin stretched film having a thickness of 110 μm (A / B / C = 22 μm / 66 μm / 22 μm) by the same method as in Example 1 by changing the amount of resin extruded. Got.
[0104]
The opacity, thickness, and porosity of the film layer (A) were measured in the same manner as in Example 1. As a result, the opacity of the film layer was 93%, the thickness of the film layer was 110 μm, and the porosity of the film layer was 30%.
[0105]
Next, a foamed resin layer (C) was formed on the back layer (c) side of the obtained film layer (A) in the same manner as in Example 1 to produce a sheet. The structure of the obtained sheet was a two-layer structure of a film layer (A) / a foamed resin layer (C).
[0106]
The opacity, whiteness, total light transmittance and total light transmittance of the obtained sheet were measured in the same manner as in Example 1 from the surface layer (a) side of the film layer. As a result, the opacity measured from the surface layer (a) side of the film layer (A) was 94%, the whiteness was 96%, and the total light transmittance was 10%. The thickness of the entire sheet was 255 μm.
[0107]
Next, the same pattern as in Example 1 was applied on the film layer surface of the obtained sheet by four-color printing, and the sharpness of the image of the obtained recorded matter was evaluated. As a result, it was x.
[0108]
Comparative Example 2
A sheet was obtained in the same manner as in Example 1 except that the film layer (A) containing a thermoplastic resin produced as described below was used.
[0109]
87% of propylene homopolymer (Novatec PP: MA4, manufactured by Nippon Polychem Co., Ltd.), 10% of high-density polyethylene (Novatec HD: HJ360, manufactured by Nippon Polychem Co., Ltd.) and 3% of calcium carbonate (Softon 1800, manufactured by Bihoku Powder Chemical Industry Co., Ltd.) Was melt-kneaded at 250 ° C., supplied to a die set at 250 ° C., extruded into a sheet, and cooled by a cooling roll to obtain a non-stretched sheet. The obtained unstretched sheet was heated to 160 ° C. and stretched in the machine direction at a magnification of 4 times to obtain a base material layer (b). Next, 94% of propylene homopolymer (Novatec PP: EA8, manufactured by Nippon Polychem Co., Ltd.), 3% of high-density polyethylene (Novatec HD: HJ360, manufactured by Nippon Polychem Co., Ltd.) and calcium carbonate (Softon 1800, manufactured by Bihoku Powder Chemical Industry Co., Ltd.) 3) melt-kneaded at 250 ° C. with separate extruders, and then supplied to a die set at 250 ° C. and extruded into a sheet, and the above-mentioned substrate layer was formed as a surface layer (a) and a back layer (c). (B) was laminated on both sides and cooled to 60 ° C. to obtain a laminated film (a / b / c) having a three-layer structure. Next, the obtained laminated film having a three-layer structure was heated again to 185 ° C. and stretched in a transverse direction at a magnification of 9 times with a tenter. Thereafter, after annealing at 165 ° C., the temperature is cooled to 60 ° C., the ears are slit, and a thermoplastic resin comprising a multilayer resin stretched film having a thickness of 110 μm (a / b / c = 20 μm / 70 μm / 20 μm) is removed. The resulting film layer was obtained.
[0110]
The whiteness, opacity and porosity of the film layer (A) were measured in the same manner as in Example 1. As a result, the whiteness of the film layer was 75%, the opacity was 25%, and the porosity was 5%.
[0111]
Next, a concealing layer (B) was formed in the same manner as in Example 1 on the entire back surface layer (c) side of the obtained film layer (A) containing a thermoplastic resin.
[0112]
Next, an acrylic resin layer having a thickness of 143 μm as a foamed resin layer (C) was formed on the entire surface of the formed concealing layer (B) in the same manner as in Example 1 to obtain a sheet. The structure of the obtained sheet was a three-layer structure of a film layer (A) / concealing layer (B) / foamed resin layer (C).
[0113]
The opacity, whiteness, and thickness of the obtained sheet were measured in the same manner as in Example 1 from the surface layer (a) side of the film layer. As a result, the opacity measured from the surface layer (a) side of the film layer (A) was 40%, and the whiteness was 78%. The thickness of the entire sheet was 255 μm.
[0114]
Next, the same pattern as in Example 1 was applied on the film layer surface of the obtained sheet by four-color printing, and the sharpness of the image of the obtained recorded matter was evaluated. As a result, it was x.
[0115]
Reference Example 1
An acrylic resin layer as a foamed resin layer (C) was formed on the entire surface of the concealing layer (B) in the same manner as in Example 1 except that a foamed acrylic emulsion containing an acrylic resin having a Tg of -54 ° C was used. Was formed. When the surface of the acrylic resin layer was observed in the same manner as in Example 1, a depression having a diameter of 5 to 100 μm was formed in the acrylic resin layer 1 mm.²It was confirmed that about 300 of them existed in each case.
[0116]
Thereafter, in the same manner as in Example 1, the surface contamination state was evaluated in addition to the initial adsorption force and the change over time of the adsorption force of the sheet.
[0117]
The values of the initial adsorption force of the sheet are 0.10 N / cm for a glass plate, 0.11 N / cm for an aluminum plate, 0.05 N / cm for a SUS304 plate, and In this case, the initial adsorbing force was 0.05 N / cm for the polyester film B and 0.20 N / cm for the polyester film B. That is, it was confirmed that the initial adsorption force was sufficient.
[0118]
However, with respect to the change over time of the adsorption force of the foamed resin layer (C) of the sheet, it was confirmed that the adsorption force was 2 to 2.5 times the initial value for any of the objects to be adhered, making it difficult to peel off. Was. The surface contamination state was x.
[0119]
Reference Example 2
An acrylic resin layer as a foamed resin layer (C) was formed on the entire surface of the concealing layer (B) in the same manner as in Example 1 except that a foamed acrylic emulsion containing an acrylic resin having a Tg of 3 ° C. was used. Formed. When the surface of the acrylic resin layer was observed in the same manner as in Example 1, a depression having a diameter of 5 to 100 μm was formed in the acrylic resin layer 1 mm.²It was confirmed that about 300 of them existed in each case.
[0120]
Thereafter, in the same manner as in Example 1, the surface contamination state was evaluated in addition to the initial adsorption force and the change over time of the adsorption force of the sheet.
[0121]
The surface contamination state was ○.
[0122]
However, the value of the initial adsorption force of the sheet was 0.008 N / cm for a glass plate, 0.009 N / cm for an aluminum plate, 0.007 N / cm for a SUS304 plate, and a polyester film A. And the polyester film B exhibited an initial adsorption force of 0.08 N / cm. That is, it was confirmed that the initial adsorptive power was lower than that of Example 1 and the adsorptivity was poor. With respect to the change over time in the attraction force of the foamed resin layer (C) of the sheet, excluding the polyester film b, the sheet was peeled off with an extremely small force, and the change over time and the evaluation of the optical characteristics could not be performed. Although no change in the adsorption force with time was observed for the polyester film B, the film tended to be slightly difficult to peel off.
[0123]
Reference Example 3
Except for drying the foamed acrylic emulsion liquid applied with a comma coater from 120 ° C. to 150 ° C. for 10 minutes at a constant temperature rising rate, the same procedure as in Example 1 was carried out to cover the entire surface of the concealing layer (B). An acrylic resin layer was formed as the foamed resin layer (C). When the surface of the acrylic resin layer was observed in the same manner as in Example 1, a depression having a diameter of 5 to 100 μm was formed in the acrylic resin layer 1 mm.²It was confirmed that about 80 of them existed.
[0124]
Thereafter, in the same manner as in Example 1, the surface contamination state was evaluated in addition to the initial adsorption force and the change over time of the adsorption force of the sheet.
[0125]
The surface contamination state was ○.
[0126]
However, the value of the initial adsorption force of the sheet is 0.01 N / cm for a glass plate, 0.01 N / cm for an aluminum plate, 0.01 N / cm for a SUS304 plate, and a polyester film A. And the polyester film B exhibited an initial adsorption force of 0.07 N / cm. That is, it was confirmed that the initial adsorption force tended to be lower than that of Example 1. With respect to the change over time in the attraction force of the foamed resin layer (C) of the sheet, the attraction force changes over time with respect to any of the glass plate, the aluminum plate, the SUS304 plate, the polyester film A, and the polyester film B. Did not.
[0127]
【The invention's effect】
As described above, according to the present invention, the printability is excellent, for example, it can be easily attached to various objects such as a synthetic resin plate, a decorative plate, a metal plate, and a glass plate. Can be easily peeled off and re-applied, preventing the deterioration of visibility due to the see-through of the color, pattern or background of the applied wall surface, and remaining dirt on the side to be pasted after peeling It is possible to provide a sheet that is not to be caused, a recorded matter made of the sheet, and a POP card made of the recorded matter.
[Brief description of the drawings]
FIG. 1 is a sectional view of a sheet according to an embodiment of the present invention.
FIG. 2 is an enlarged view of a portion II in FIG.
FIG. 3 is a perspective view showing an example of a storage state of the sheet of FIG. 1;
FIG. 4 is a cross-sectional view showing an embodiment in which a release film is laminated on the sheet of FIG.
FIG. 5 is a cross-sectional view illustrating an example of a recorded matter obtained by printing the sheet of FIG. 1;
[Explanation of symbols]
2 ... sheet
4 ... film layer containing thermoplastic resin (A)
5 ... Concealment layer (B)
6. Foamed resin layer (C)
62 ... sinkhole
10 ... Core material
20 ... Release film (Y)
30 ... Printing
100 ... Recorded

Claims (13)

A film layer (A) containing a thermoplastic resin,
A concealing layer (B) provided on one side of the film layer (A);
A sheet having a foamed resin layer (C) provided on the opposite side of the concealing layer (B) from the film layer (A),
The whiteness measured from the surface side of the film layer (A) is 80% or more;
The overall opacity is 98% or more,
A sheet having an overall thickness of 80 to 1000 µm. The sheet according to claim 1, wherein the total light transmittance is 5% or less. The sheet according to claim 1, wherein the film layer (A) has an opacity of 85% or more. The sheet according to any one of claims 1 to 3, wherein the film layer (A) has a thickness of 20 to 900 µm. The sheet according to any one of claims 1 to 4, wherein the film layer (A) has a porosity of 10 to 60%. The sheet according to any one of claims 1 to 5, wherein the film layer (A) includes a stretched layer. The sheet according to any one of claims 1 to 6, further comprising a coating layer (X) having printability laminated on the surface of the film layer (A). The sheet according to any one of claims 1 to 7, further comprising a second film layer (D) containing a thermoplastic resin between the concealing layer (B) and the foamed resin layer (C). The sheet according to any one of claims 1 to 8, wherein the thermoplastic resin contained in the film layer (A) or the film layer (D) includes a polyolefin resin or a polyester resin. The foamed resin layer (C) is made of a synthetic resin having a glass transition temperature of −50 to 0 ° C., and has depressions having a diameter of 5 to 100 μm on its surface at a rate of 100 to 1000 / mm ^2. The sheet according to any one of claims 1 to 9, which is a sheet. The sheet according to any one of claims 1 to 10, further comprising a release film (Y) releasably laminated on the surface of the foamed resin layer (C). A recorded matter obtained by printing the sheet according to any one of claims 1 to 11. A POP card comprising the recorded matter according to claim 12.

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