Laminates and adhesive tapes with laminates

Abstract

To provide a laminate that can be suitable for an adhesive tape, the laminate capable of reducing the load on the environment and also suppressing delamination.SOLUTION: A laminate at least has a support layer, and a laminate layer provided on one principal face side of the support layer. The support layer comprises a cloth-like material comprising filaments composed of first thermoplastic resin. The laminate layer comprises a second thermoplastic resin. At least one of the first thermoplastic resin and the second thermoplastic resin comprises plant-derived biopolyolefin.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to laminates, and more particularly to environmentally friendly laminates using plant-derived polyolefins. [Background technology]

[0002] Adhesive tapes generally have a structure in which an adhesive layer is provided on one or both sides of a long support layer, and are widely used for packaging, repair, and protective covering. Adhesive tapes require tensile strength for work efficiency, as well as tearability and straight cutability. If the tensile strength is low, unintended breakage is likely to occur, and for example, when peeling off the adhesive tape, residue may remain, which may reduce work efficiency. Therefore, in order to improve the straight cutability of adhesive tapes, it is known to use woven fabric as the support layer (for example, Patent Document 1, etc.).

[0003] Polyolefin is known to be used as the support layer (woven fabric layer) as described above, or as the laminate layer provided between the support layer and the adhesive layer (Patent Document 2, etc.).

[0004] Meanwhile, with the growing demand for the creation of a circular economy, there is a desire to move away from fossil fuels in the materials sector, just as there is a desire for energy, and the use of biomass is attracting attention. Biomass is an organic compound produced by photosynthesis from carbon dioxide and water, and by utilizing it, it is converted back into carbon dioxide and water, making it a so-called carbon-neutral renewable energy source. Recently, the practical application of biomass plastics made from these biomass materials has been progressing rapidly, and attempts are being made to manufacture various resins from biomass raw materials. For example, polyethylene is widely used as a material for films, sheets, etc., and is used in large quantities worldwide, so there is consideration to replacing conventional fossil fuel-derived polyethylene with plant-derived polyethylene made from biomass (Patent Document 3, etc.). [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2007-63511 [Patent Document 2] Japanese Patent Publication No. 2021-28370 [Patent Document 3] Special Publication No. 2011-506628 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] Ideally, when adhesive tapes with the layer structure described above are peeled off after being applied to an object, the peeling should occur at the interface between the adhesive layer of the tape and the object. However, in some cases, delamination between layers within the adhesive tape can occur. In such cases, removing the adhesive layer remaining on the object side is a time-consuming task. In particular, when the support layer consists of a cloth-like material made up of linear fibers, the contact area with the laminate layer tends to be small, and delamination between layers can occur at the interface between the support layer and the laminate layer.

[0007] Therefore, the present invention aims to provide a laminate that can be suitably used in adhesive tapes that can reduce environmental impact and suppress delamination. [Means for solving the problem]

[0008] The inventors found that when they replaced the polyolefin used in the components of the adhesive tape with a plant-derived biopolyolefin, they were able to suppress interlayer delamination within the adhesive tape, contrary to their expectations. The present invention is based on this finding. The gist of the present invention is as follows.

[0009] [1] A laminate comprising at least a support layer and a laminate layer provided on one main surface side of the support layer, The support layer consists of a cloth-like body made of linear bodies of a first thermoplastic resin, The laminate layer is formed of a second thermoplastic resin, A laminate, wherein at least one thermoplastic resin of the first thermoplastic resin and the second thermoplastic resin comprises a plant-derived biopolyolefin. [2] The laminate according to [1], wherein a biomass content of at least one thermoplastic resin of the first thermoplastic resin and the second thermoplastic resin is 4% or more. [3] The laminate according to [1] or [2], wherein the support layer is formed of a cloth-like body obtained by knitting, weaving, or cross-bonding the linear bodies. [4] The laminate according to any one of [1] to [3], wherein the laminate layer has a thickness of 10 to 200 µm. [5] The laminate according to any one of [1] to [4], wherein both the first thermoplastic resin and the second thermoplastic resin comprise a plant-derived biopolyolefin. [6] The laminate according to [5], wherein both the first thermoplastic resin and the second thermoplastic resin have a biomass content of 4% or more. [7] The laminate according to any one of [1] to [6], wherein the biopolyolefin is biopolyethylene. [8] An adhesive tape comprising the laminate according to any one of [1] to [7], An adhesive tape comprising an adhesive layer on a main surface side of the laminate opposite to the support layer side of the laminate layer, and / or on a main surface side of the support layer opposite to the laminate layer side. [Advantageous Effects of Invention]

[0010] According to the present invention, there is provided a laminate that can reduce environmental load and can be suitably used for an adhesive tape capable of suppressing interlayer delamination. [Brief Description of Drawings]

[0011] [Figure 1] FIG. 1 is a perspective view of an adhesive tape roll including the laminate according to the first embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view taken along line I-I of FIG. 1. [Figure 3]Fig. 3 is a schematic cross-sectional view of a filament constituting a cloth-like body. [Figure 4] Fig. 4 is a plan view of a support layer (woven fabric layer) provided in the laminate according to the first embodiment of the present invention. [Figure 5] Fig. 5(A) is a cross-sectional view taken along line A-A in Fig. 4, and Fig. 5(B) is a cross-sectional view taken along line B-B in Fig. 4. [Figure 6] Fig. 6 is a plan view of a support layer (cross-bonded fabric layer) provided in the laminate according to the second embodiment of the present invention. [Figure 7] Fig. 7 is a cross-sectional view taken along line C-C in Fig. 6. [Figure 8] Fig. 8 is a plan view of a support layer (knitted fabric layer) provided in the laminate according to the third embodiment of the present invention. [Figure 9] Fig. 9 is a cross-sectional view of a laminate according to a modification of the first to third embodiments of the present invention. [Figure 10] Fig. 10 is a cross-sectional view of a modification of an embodiment of an adhesive tape using the laminate of the first to third embodiments of the present invention. [Figure 11] Fig. 11 is a cross-sectional view of a modification of an embodiment of an adhesive tape using the laminate of the first to third embodiments of the present invention.. MODE FOR CARRYING OUT THE INVENTION

[0012] Hereinafter, embodiments of the laminate of the present invention will be described with reference to the drawings. In the laminate according to the embodiment of the present invention, the embodiment in which the cloth-like body constituting the support layer is a woven fabric obtained by weaving warps and wefts is referred to as laminate 1A, the embodiment in which the cloth-like body is a cross-bonded fabric (soff) obtained by cross-bonding warps and wefts is referred to as laminate 1B, and the embodiment in which the cloth-like body is a knitted fabric obtained by knitting warps and wefts is referred to as laminate 1C.

[0013] <First Embodiment> Hereinafter, an embodiment of the laminate 1A of the present invention will be described based on Figures 1 to 5. Figure 1 is a perspective view of an adhesive tape winding body comprising the laminate 1A, and Figure 2 is a cross-sectional view taken along line II in Figure 1. Figure 3 is a schematic cross-sectional view of the linear material constituting the cloth-like body, Figure 4 is a plan view of the support layer provided by the laminate 1A, Figure 5(A) is a cross-sectional view taken along line AA in Figure 4, and Figure 5(B) is a cross-sectional view taken along line BB in Figure 4.

[0014] As shown in Figures 1 to 5, the laminate 1A has a longitudinal direction X, a transverse direction Y, and a thickness direction Z that are all orthogonal to each other. The longitudinal direction, transverse direction, and thickness direction of the layers constituting the laminate 1A correspond to the longitudinal direction X, transverse direction Y, and thickness direction Z of the adhesive tape winding body containing the laminate 1A shown in Figure 1, respectively.

[0015] As shown in Figure 1, the adhesive tape comprising the laminate 1A is preferably provided in the form of an adhesive tape winding 100 formed by winding it around a cylindrical or cylindrical core material C. However, the core material C is optional, and embodiments in which the core material C is omitted in the adhesive tape winding 100 are also included in the present invention.

[0016] The diameter of the core material C is not particularly limited, but is usually 1.0 cm to 20.0 cm, preferably 2.0 cm to 10.0 cm, and more preferably 2.5 cm to 8.0 cm. The length of the core material C (length in the shorter direction Y) is not particularly limited, but is usually approximately the same as the width of the adhesive tape with the laminate 1A, or is greater than the width of the adhesive tape.

[0017] The materials constituting the core material C are not particularly limited, and known core materials can be used. Examples of materials constituting the core material C include metal, resin, wood, paper, etc.

[0018] As shown in Figure 2, the laminate 1A comprises a support layer 10 and a first laminate layer 20 provided on one main surface side S1 of the support layer 10. The adhesive tape comprising the laminate 1A also comprises a first adhesive layer 30 provided on the main surface side S2 of the first laminate layer 20 of the laminate 1A, opposite to the support layer 10 side.

[0019] As shown in Figure 2, one main surface T1 of the adhesive tape comprising the laminate 1A is formed by the adhesive layer 30, and the other main surface T2 of the laminate 1A is formed by the support layer 10.

[0020] Adhesive tape with laminate 1A is typically torn in the short direction Y, and the resulting fragments of adhesive tape are used for packaging, repair, protection, etc.

[0021] [Laminate layer] The laminate layer 20, provided on one main surface side of the elongated support layer 10, has an elongated shape extending in the longitudinal direction X. The laminate layer 20 is usually flexible.

[0022] The material constituting the laminate layer 20 is not particularly limited as long as it is a thermoplastic resin, and the same material as that used in the laminate layer of known adhesive tapes can be used. However, it is preferable that the thermoplastic resin constituting the laminate layer 20 (hereinafter sometimes referred to as the "second thermoplastic resin" to distinguish it from the thermoplastic resin constituting the support layer described later) contains a plant-derived polyolefin. In the present invention, by using a plant-derived polyolefin (hereinafter sometimes referred to as "bio-polyolefin"), the environmental burden can be reduced compared to when using a thermoplastic resin derived from fossil fuels. Furthermore, in the present invention, as described later, by including a bio-polyolefin in the thermoplastic resin constituting the laminate layer 20, delamination can be suppressed compared to conventional adhesive tapes using polyolefin derived from fossil fuels. The reason why delamination is suppressed is not clear, but it can be inferred as follows.

[0023] In other words, biopolyolefins are obtained by polymerizing plant-derived ethylene or propylene, as described later. Although such biopolyolefins have physical properties similar to conventional polyolefins derived from fossil fuels, the influence of low molecular weight components contained in the polymer results in a favorable balance of molecular weight distribution in the thermoplastic resin, and it is believed that this has the effect of improving the peel strength between layers in the laminate layer or support layer composed of this thermoplastic resin.

[0024] In this specification, plant-derived polyolefin means a polyolefin in which at least a portion of the olefin monomers constituting the polyolefin are derived from plants, and fossil fuel-derived polyolefin means a polyolefin in which all of the olefin monomers constituting the polyolefin are derived from fossil fuels such as petroleum.

[0025] Examples of plant-derived olefins include plant-derived ethylene and propylene. Plant-derived ethylene can be produced, for example, by dehydrating ethanol produced by fermentation of biomass derived from plants such as sugarcane and corn. Plant-derived propylene can be produced, for example, by dehydrating propanol produced by fermentation of biomass. If the biomass is a carbohydrate such as starch, the sugars obtained by hydrolyzing the carbohydrate may be fermented.

[0026] Biopolyolefins may be those manufactured by known methods or commercially available ones. Specific examples of biopolyolefins include polyethylene, a polymer of plant-derived ethylene, and polypropylene, a polymer of plant-derived propylene. When biopolyolefins contain α-olefins such as 1-butene, 1-hexene, and 1-octene as comonomers, these α-olefins may be α-olefins manufactured by methods derived from biomass such as plants, or α-olefins derived from fossil fuels.

[0027] Fossil fuel-derived olefins and polyolefins do not contain radioactive carbon (14C) with mass number 14, whereas plant-derived olefins and polyolefins do contain 14C, thus distinguishing them from each other. The proportion of plant-derived carbon (hereinafter also referred to as "biomass content") can be measured based on the 14C content. In this invention, a higher biomass content is preferable for the biopolyolefin used, as it contributes to reducing environmental impact. However, the biomass content does not necessarily have to be 100%, and fossil fuel-derived olefins may be present at the monomer level. The preferred biomass content for biopolyolefins is 50-100%. In this specification, the biomass content can be calculated by measuring the bio-based carbon content based on 14C (radioactive carbon) analysis in accordance with ASTM D6866-21. Radioactive carbon 14C exists in the atmosphere at a certain rate, and plant-derived resins also contain 14C at a certain rate. In contrast, fossil fuel-derived resins contain almost no 14C. By utilizing this property and measuring the concentration of 14C in the resin using an accelerator mass spectrometer or similar device, the biomass content can be determined.

[0028] The specific method for measuring biomass involves separating the laminate layer and / or support layer from the laminate, burning the separated laminate layer and / or support layer to generate carbon dioxide (CO2), and purifying the carbon dioxide in a vacuum line. Next, the purified carbon dioxide is reduced with hydrogen using iron as a catalyst to produce graphite (C). Subsequently, the graphite is packed into a cathode with an inner diameter of 1 mm using a hand press machine, fitted into a wheel, and mounted on a measuring device (for example, a 14C-AMS dedicated device based on a tandem accelerator (manufactured by NEC Corporation)) to measure the counting of 14C, the concentration of 13C (13C / 12C), and the concentration of 14C (14C / 12C). In the measurement, oxalic acid (HOxII) is used as the standard sample. Measurement of this standard sample and the background sample is also performed simultaneously. From the obtained measurement values, δ is calculated according to ASTM D6866-21. 13 The biomass content can be calculated using C-corrected pMC.

[0029] Examples of the thermoplastic resin include olefin polymers (for example, ethylene-α-olefin copolymers such as low density polyethylene, linear low density polyethylene, high density polyethylene, and ethylene-propylene copolymer, ethylene-vinyl acetate copolymers, polypropylene, etc.), polyesters (for example, polyethylene terephthalate, polybutylene terephthalate, etc.), polyamides (for example, nylon 6, nylon 66, etc.), polyvinyl chloride, polyurethane, etc., among which olefin polymers are preferred. When tearability is emphasized, low density polyethylene or linear low density polyethylene among olefin polymers is preferred. In addition, the aforementioned biopolyolefin is also preferably plant-derived low density polyethylene or linear low density polyethylene. On the other hand, when importance is placed on the strength and durability of the adhesive tape, high density polyethylene is preferred. In this case also, it is preferable to use plant-derived high density polyethylene.

[0030] The density of low density polyethylene or linear low density polyethylene is usually 0.870 g / cm 3 or more and 0.942 g / cm 3 or less, preferably 0.875 g / cm 3 or more and 0.936 g / cm 3 or less. The density of high density polyethylene is usually 0.940 g / cm 3 or more and 0.970 g / cm 3 or less, preferably 0.940 g / cm 3 or more and 0.960 g / cm 3 or less. Generally, for polyethylene, lower density leads to decreased mechanical strength, and higher density leads to decreased flexibility.

[0031] The second thermoplastic resin constituting the laminate layer 20 preferably has a biomass content of 4% or more, more preferably 10% or more, even more preferably 25% or more, and particularly preferably 35% or more. Increasing the biomass content can reduce environmental impact and suppress delamination between layers. Furthermore, the upper limit of the biomass content is preferably 100% or less, more preferably 80% or less, even more preferably 60% or less, and particularly preferably 40% or less. Setting the biomass content within a preferred range results in good tear resistance. The biomass content of the second thermoplastic resin can be controlled, for example, by adjusting the blending ratio of biopolyolefin in the resin constituting the second thermoplastic resin.

[0032] In the second thermoplastic resin, the biopolyolefin content is preferably 5% by mass or more, more preferably 10% by mass or more, even more preferably 15% by mass or more, and particularly preferably 20% by mass or more. Furthermore, the upper limit of the content is preferably 100% by mass or less, more preferably 90% by mass or less, even more preferably 80% by mass or less, and particularly preferably 70% by mass or less. By setting the biopolyolefin content within the above range, it is possible to reduce environmental impact and suppress delamination between layers. In addition, by setting the biopolyolefin content within the preferred range, good tear resistance is achieved.

[0033] The thermoplastic resin (second thermoplastic resin) constituting the laminate layer 20 may contain one or more additives as needed. Examples of additives include antioxidants, light stabilizers, ultraviolet absorbers, antistatic agents, dispersants (e.g., bisamide-based, wax-based, organometallic salt-based, etc.), lubricants (e.g., bisamide-based, wax-based, organometallic salt-based, ester-based, etc.), flame retardants, fillers, pigments, antibacterial agents, etc.

[0034] The thickness of the laminate layer 20 can be adjusted as appropriate. Preferably, the thickness of the laminate layer 20 is 10 μm or more and 200 μm or less. By setting the thickness of the laminate layer 20 within the above range, delamination between the laminate layer and the substrate layer can be further suppressed.

[0035] [Support layer] As shown in Figure 4, the support layer 10 consists of a fabric-like body (woven fabric layer 10A) formed by weaving together filaments made of a first thermoplastic resin as warp threads 11 and weft threads 12.

[0036] The filaments constituting the warp threads 11 and weft threads 12 may be monofilaments, tapes, yarns, split yarns, multifilaments, staple fibers, etc., with tape-shaped flat yarns being preferred among these. Such flat yarns can also be made into split yarns by making numerous small cuts in the longitudinal direction (vertical direction).

[0037] The filament may be unstretched, but it is preferable that it be stretched. Stretching may be uniaxial or biaxial. Stretching can be performed by methods such as stretching with a hot roll, stretching with a hot plate, or stretching with a roll in a hot air furnace. The stretching ratio is usually between 3 and 12 times, preferably between 5 and 10 times.

[0038] Preferred cross-sectional shapes when the warp threads 11 consist of flat yarn are illustrated in Figures 3(a) to (d). Preferred cross-sectional shapes when the warp threads 11 consist of monofilament are illustrated in Figures 3(e) to (g). Figure 3(a) is an example in which the flat yarn is composed of a single layer, Figure 3(b) is an example in which the bonding layer 11B is laminated on one side of the base layer 11A, Figure 3(c) is an example in which the bonding layer 11B is laminated on both sides of the base layer 11A, and Figure 3(d) is an example of a core-sheath structure in which the base layer 11A is the core material and the bonding layer 11B is the sheath.

[0039] Furthermore, Figure 3(e) shows an example of a core-sheath structure in which the base layer 11A is the core material and the bonding layer 11B is the sheath; Figure 3(f) shows an example of a side-by-side structure in which the bonding layer 11B is provided on one side in the width direction of the base layer 11A; and Figure 3(g) shows an example of a sea-island structure in which the base layer 11A is the island and the bonding layer 11B is the sea.

[0040] It is preferable that the bonding layer 11B uses a thermoplastic resin with a lower melting point and superior heat-sealing properties than the thermoplastic resin constituting the base layer 11A. The bonding layer 11B can use a thermoplastic resin with a melting point 10°C or more, preferably 15°C or more, lower than the thermoplastic resin that forms the base layer 11A. In this specification, "melting point" means the melting peak temperature measured by differential scanning calorimetry (DSC) at a heating rate of 10°C / min.

[0041] From the viewpoint of lowering the melting point of the thermoplastic resin material constituting the bonding layer 11B by 15°C or more than the melting point of the thermoplastic resin material constituting the base layer 11, it is preferable that the thermoplastic resin material constituting the base layer 11 contains high-density polyethylene and the thermoplastic resin material constituting the bonding layer 11B contains low-density polyethylene.

[0042] Although the embodiment of the linear structure was described using the warp thread 11 as an example, the weft thread 12 can also be configured in a similar manner.

[0043] The materials constituting the warp threads 11 and weft threads 12 are not particularly limited as long as they are thermoplastic resins, and materials similar to those used for the support layer of known adhesive tapes can be used. However, it is preferable that the filaments constituting the support layer 10 are made of a thermoplastic resin containing biopolyolefin. By using biopolyolefin, the environmental burden can be reduced compared to when using thermoplastic resins derived from fossil fuels. Furthermore, in the present invention, as described later, by making the filaments constituting the support layer 10 from a thermoplastic resin containing biopolyolefin, interlayer delamination can be suppressed compared to conventional adhesive tapes using polyolefins derived from fossil fuels.

[0044] As the first thermoplastic resin used as the material for the filament, for example, olefin polymers such as high-density polyethylene, low-density polyethylene, linear low-density polyethylene, polypropylene, and ethylene-propylene block copolymers can be used, as well as polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon 6 and nylon 66, polyacrylic resins, and vinylidene chloride resins. Among these, olefin polymers are preferably used.

[0045] The biopolyolefins and fossil fuel-derived olefin polymers are preferably high-density polyethylene, low-density polyethylene, or linear low-density polyethylene, more preferably high-density polyethylene or low-density polyethylene, and even more preferably high-density polyethylene. The densities of high-density polyethylene, low-density polyethylene, and linear low-density polyethylene are as described above.

[0046] The first thermoplastic resin constituting the filament preferably has a biomass content of 4% or more, more preferably 10% or more, even more preferably 25% or more, and particularly preferably 50% or more. Increasing the biomass content can reduce environmental impact and suppress delamination. Furthermore, the upper limit of the biomass content is preferably 100% or less, more preferably 90% or less, and particularly preferably 80% or less. By setting the biomass content within a preferred range, it is possible to suppress breakage during stretching of the filament and improve the strength of the filament. The biomass content of the first thermoplastic resin can be controlled, for example, by adjusting the blending ratio of biopolyolefin in the resin constituting the first thermoplastic resin.

[0047] In the first thermoplastic resin, the biopolyolefin content is preferably 5% by mass or more, more preferably 10% by mass or more, even more preferably 15% by mass or more, and particularly preferably 20% by mass or more. Furthermore, the upper limit of the content is preferably 100% by mass or less, more preferably 90% by mass or less, even more preferably 80% by mass or less, and particularly preferably 70% by mass or less. In addition, the biopolyolefin may be contained in either the warp threads 11, the weft threads 12, or both. By setting the biopolyolefin content within the above range, it is possible to reduce environmental impact and suppress delamination between layers.

[0048] Next, a fabric-like body woven from warp and weft threads will be described. When the fabric-like body is a woven fabric woven from warp and weft threads, the woven fabric layer 10A constituting the support layer 10 is composed of a group of warp threads F1 that are extended in the longitudinal direction X, as shown in Figure 4. As shown in Figure 4, the group of warp threads F1 that make up the warp threads F1 are parallel or substantially parallel to each other and extend in the longitudinal direction X.

[0049] As shown in Figure 4, the weft yarn group F2 is composed of multiple weft yarns 12 extending in a direction intersecting the longitudinal direction X. The multiple weft yarns 12 constituting the weft yarn group F2 extend parallel or nearly parallel to each other in a direction intersecting the longitudinal direction X.

[0050] In this embodiment, as shown in Figure 4, the angle that the axis of each weft 12 makes with the longitudinal direction X is 90°. However, the angle that the axis of each weft 12 makes with the longitudinal direction X is not limited to 90°, as long as a support layer can be formed. The angle that the axis of each weft 12 makes with the longitudinal direction X is usually 85.4° or more and 90° or less, preferably 86.5° or more and 90° or less, and more preferably 87.7° or more and 90° or less.

[0051] In this embodiment, as shown in Figure 4, the warp threads 11 constituting the warp thread group F1 and the weft threads 12 constituting the weft thread group F2 are woven in a plain weave. That is, in this embodiment, the support layer 10 is composed of a plain weave woven fabric layer 10A. However, the woven fabric layer 10A constituting the support layer 10 is not limited to a plain weave fabric. The woven fabric layer 10A may be composed of, for example, a twill weave, diagonal weave, rib weave, double weave, etc. Alternatively, the warp threads 11 may be made of thin flat yarn, and the weft threads 12 may be woven by overlapping multiple threads. This makes it possible to obtain a flexible adhesive tape that can be easily torn by hand.

[0052] As shown in Figures 5(A) and (B), the cross-sectional shape of each warp thread 11 when cut by a plane perpendicular to its extending direction (axis), and the cross-sectional shape of each weft thread 12 when cut by a plane perpendicular to its extending direction (axis), are both substantially rectangular. In this embodiment, as shown in Figure 5, one main surface of each weft thread 12 is in contact with the other main surface of each warp thread 11, and the other main surface of each weft thread 12 is in contact with one main surface of each warp thread 11.

[0053] The number of warp threads 11 that make up the warp group F1 can be adjusted as appropriate, but is usually 20 threads / inch or more and 55 threads / inch or less, preferably 25 threads / inch or more and 50 threads / inch or less, and more preferably 28 threads / inch or more and 47 threads / inch or less.

[0054] The number of threads per inch of the weft 12 can be adjusted as appropriate, but is usually between 10 and 25 threads per inch, preferably between 12 and 23 threads per inch, and more preferably between 14 and 20 threads per inch.

[0055] It is preferable that the number of warp threads 11 is greater than the number of weft threads 12. This makes it possible to effectively reduce the tear strength and maintain or increase the tensile strength of the adhesive tape comprising the laminate 1A.

[0056] In the laminate 1A, the warp threads 11 are usually broken between two adjacent weft threads 12, so the weft threads 12 are usually arranged at regular intervals in the width direction.

[0057] The average fineness of the weft yarn 12 can be adjusted as appropriate, but is usually between 50 dt and 1000 dt, preferably between 200 dt and 400 dt, and more preferably between 250 dt and 360 dt. When the average fineness of the multiple flat yarns 32 constituting the second flat yarn group F2 is within the above range, it is possible to prevent the multiple flat yarns 32 constituting the second flat yarn group F2 from being torn when the adhesive tape comprising the laminate 1A is cut by hand in the short direction Y.

[0058] The thickness of the weft yarn 12 is not particularly limited, but is usually 10 μm to 40 μm, preferably 18 μm to 36 μm, and more preferably 26 μm to 33 μm. By setting the thickness of the weft yarn 12 within the above range, delamination between the support layer and the laminate layer can be further suppressed.

[0059] The average fineness of the warp threads 11 can be adjusted as appropriate, but is usually between 50 dt and 1000 dt, preferably between 50 dt and 250 dt, and more preferably between 60 dt and 150 dt. The warp threads are cut to a length of 1 m, their weight is measured, and this value is multiplied by 10,000 to determine the fineness of the warp threads. The average fineness is then calculated by taking the average of the fineness values ​​of 10 warp threads.

[0060] The thickness of the warp threads 11 is not particularly limited, but is usually 8 μm to 26 μm, preferably 10 μm to 24 μm, and more preferably 12 μm to 22 μm. By keeping the thickness of the warp threads 11 within the above range, delamination between the support layer and the laminate layer can be further suppressed.

[0061] The average spacing of the warp threads 11 can be adjusted as appropriate, but is usually 1.0 mm or less, preferably 0.5 mm or less, and more preferably 0.1 mm or less. The spacing between warp threads 11 may be reduced to the point where they overlap. There is no particular lower limit.

[0062] The average fineness of the warp threads 11 is preferably smaller than the average fineness of the weft threads 12. This makes it possible to effectively reduce the tear strength and maintain or increase the tensile strength of the adhesive tape comprising the laminate 1A. The ratio of the average fineness of the warp threads 11 to the average fineness of the weft threads 12 is preferably 1:2.0 to 1:4.5, more preferably 1:2.0 to 1:4.0, and even more preferably 1:2.0 to 1:3.5.

[0063] The thermoplastic resin material (first thermoplastic resin) that constitutes the filamentous structure, which consists of warp and weft threads, may contain one or more additives as needed. Specifically, examples of additives include antioxidants such as phenolic, organic phosphite, organophosphorus (such as phosphite), and thioether-based antioxidants; light stabilizers such as hindered amine-based antioxidants; ultraviolet absorbers such as benzophenone, benzotriazole, and benzoate-based ultraviolet absorbers; antistatic agents such as nonionic, cationic, and anionic-based antioxidants; dispersants such as bisamide, wax, and organometallic salt-based dispersants; lubricants such as amide, wax, organometallic salt, and ester-based lubricants; flame retardants such as bromine-containing organic compounds, melamine compounds, phosphoric acid compounds, phosphate ester compounds, antimony trioxide, magnesium hydroxide, and red phosphorus; organic pigments; inorganic pigments; and inorganic and organic antibacterial agents such as metal ion-based antibacterial agents.

[0064] [Adhesive layer] The adhesive layer 30 provided on the main surface side of the laminate layer 1A opposite to the support layer side, and / or the main surface side of the support layer opposite to the laminate layer side, is a layer composed of an adhesive. The adhesive that constitutes the adhesive layer 30 is not particularly limited, and an adhesive similar to that of a known adhesive tape can be used. The adhesive layer 30 may be composed of one type of adhesive or two or more types of adhesives. Examples of adhesives include acrylic resin adhesives, rubber adhesives (e.g., natural rubber adhesives, synthetic rubber adhesives, etc.), block copolymer adhesives (e.g., styrene-butadiene-styrene block copolymer, styrene-isoprene-styrene block copolymer, and corresponding hydrogenated block copolymer adhesives, etc.), ethylene-vinyl acetate copolymer adhesives, polyvinyl ether resin adhesives, silicone resin adhesives, etc., but among these, acrylic resin adhesives are preferred. Acrylic resin adhesives have excellent durability and weather resistance and do not cause much contamination during handling.

[0065] Examples of acrylic resin-based adhesives include adhesives obtained by polymerizing monomer materials containing carboxyl group-containing polymerizable monomers or alkyl (meth)acrylate monomers. Note that "(meth)acrylic acid" refers to acrylic acid or methacrylic acid.

[0066] A carboxyl group-containing polymerizable monomer is a radically polymerizable monomer having one or more carboxyl groups or salts of carboxyl groups and one or more carbon-carbon unsaturated double bonds. Examples of carboxyl group-containing polymerizable monomers include monocarboxylic acids (e.g., acrylic acid, methacrylic acid, crotonic acid, itaconic acid, etc.), dicarboxylic acids (e.g., fumaric acid, maleic acid, etc.), and monoesters of dicarboxylic acids, but acrylic acid or methacrylic acid is preferred. The amount of carboxyl group-containing polymerizable monomer is, for example, about 1 to 20% by weight of the total monomer material.

[0067] The number of carbon atoms in the alkyl group of the alkyl (meth)acrylate monomer is, for example, about 4 to 12. Examples of alkyl (meth)acrylate monomers include n-butyl (meth)acrylate, isobutyl (meth)acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, and isononyl (meth)acrylate, but among these, n-butyl acrylate or 2-ethylhexyl acrylate is preferred.

[0068] Monomeric materials containing carboxyl group-containing polymerizable monomers or alkyl (meth)acrylate monomers may contain small amounts of monomers that can copolymerize with other monomers for the purpose of modifying adhesives (for example, adjusting the glass transition temperature, polarity, etc., of the adhesive). Examples of such monomers include methyl (meth)acrylate, ethyl (meth)acrylate, acrylamide, vinyl acetate, styrene, acrylonitrile, vinylpyrrolidone, and the like.

[0069] The adhesive layer 30 preferably contains, along with an adhesive such as an acrylic resin adhesive, a crosslinking agent, which is a polyfunctional compound having two or more functional groups that react with carboxyl groups, etc., in its molecule, or a monofunctional compound having one functional group that reacts with carboxyl groups, etc., in its molecule. Examples of such crosslinking agents include isocyanate compounds, epoxy (or glycidyl) compounds, aziridinyl compounds, metal chelate compounds, melamine compounds, and the like.

[0070] The form of the adhesive is not particularly limited as long as it does not impair its function as an adhesive, and may be any form such as a solution-type adhesive, emulsion-type adhesive, hot-melt-type adhesive, reactive-type adhesive, or photopolymerizable monomer-type adhesive.

[0071] The adhesive layer 30 may contain one or more additives as needed. Examples of additives include crosslinking agents (e.g., polyisocyanate compounds, aziridine compounds, metal chelate compounds, etc.), tackifiers, coupling agents, fillers, softeners, plasticizers, surfactants, antioxidants, heat stabilizers, light stabilizers, UV absorbers, colorants, defoamers, flame retardants, antistatic agents, and discoloration inhibitors.

[0072] Examples of plasticizers that may be included in the adhesive layer 30 include low molecular weight plasticizers such as esters of aliphatic polycarboxylic acids, esters of aromatic polycarboxylic acids, and phosphate esters, and high molecular weight plasticizers such as polyesters. However, esters of aliphatic dibasic acids are preferred, and adipic acid diesters are more preferred. The amount of plasticizer added is, for example, about 0.05 to 4% by weight.

[0073] Examples of anti-discoloration agents that may be included in the adhesive layer 30 include benzotriazole compounds. Benzotriazole compounds are known to have an anti-corrosion effect on metals, making it possible to prevent discoloration due to corrosion of the metal to which the adhesive tape is attached. The amount of benzotriazole compound included is, for example, about 0.01 to 5% by weight.

[0074] The thickness of the adhesive layer 30 can be adjusted as appropriate, but if the thickness of the adhesive layer 30 is too small, the adhesion and conformability to uneven surfaces of the adhesive tape may be insufficient, while if the thickness of the adhesive layer 30 is too large, the increase in adhesiveness may not justify the increase in cost. The thickness of the adhesive layer 30 is preferably 10 μm or more and 0.5 mm or less.

[0075] Regarding the method for forming the adhesive layer of the adhesive tape, known general methods for manufacturing adhesive tapes can be applied. For example, the tape can be manufactured by coating and drying the adhesive on the surface of a laminate layer or support layer, or by coating and drying the adhesive on one side of a release liner to form an adhesive layer, and then stacking a laminate on the surface of the formed adhesive layer. The drying conditions for the adhesive are usually preferably 70 to 100°C for about 1 to 5 minutes, and after drying, it is preferable to perform an aging treatment at 10 to 40°C for about 1 to 20 days.

[0076] Furthermore, the inclusion of plant-derived biopolyolefins in the thermoplastic resin constituting the laminate layer and / or support layer of the laminate 1A tends to improve the peel strength between the laminate layer or support layer and the adhesive layer.

[0077] <Second Embodiment> The laminate 1B according to an embodiment of the present invention will be described below with reference to Figures 6 and 7. Note that the laminate layer and adhesive layer constituting the laminate 1B are the same as those in the laminate 1A according to an embodiment of the present invention, and therefore their description will be omitted.

[0078] The support layer constituting the laminate 1B according to this embodiment is composed of a fabric-like body made of a cross-bonded fabric (sof) formed by cross-bonding warp threads 13 and weft threads 14, using filaments made of a first thermoplastic resin as warp threads 13 and weft threads 14. Figure 6 is a plan view of the cross-bonded fabric layer 10B, and Figure 7 is a cross-sectional view taken along line CC of Figure 6.

[0079] As shown in Figures 6 and 7, the cross-bonded fabric layer 10B is a layer formed by heat-sealing the warp yarn group F3 to one side (the lower side in Figure 7) of the weft yarn group F4. The warp yarn group F3 consists of a plurality of flat yarns 13 extending in the longitudinal direction X, and the weft yarn group F4 consists of a plurality of flat yarns 14 extending in a direction intersecting the longitudinal direction X. The flat yarns 13 are made of single-layer flat yarns, and the flat yarns 14 are made of flat yarns comprising a base layer and a bonding layer provided on one or both main surface sides of the base layer. The surface layers of the plurality of flat yarns 14 constituting the weft yarn group F4 are heat-sealed to the plurality of flat yarns 13 constituting the warp yarn group F3.

[0080] A single-layer flat yarn may be in the form shown in Figure 3(a) above, and a flat yarn comprising a base layer and a binding layer provided on one or both main surfaces of the base layer may be in the form shown in Figures 3(b) to (d) above.

[0081] Compared to laminate 1A, laminate 1B generally has lower tensile strength and higher tear strength. This is because, in laminate 1A, flat yarn is woven in, resulting in the yarns being more firmly fixed together in the support layer 10.

[0082] <Third Embodiment> Hereinafter, a laminate 1C according to an embodiment of the present invention will be described with reference to Figure 8. Note that the laminate layer and adhesive layer constituting the laminate 1C are the same as those in the laminate 1A according to an embodiment of the present invention, and therefore their description will be omitted.

[0083] The support layer 10 constituting the laminate 1C according to this embodiment is made of a fabric-like body formed by using linear bodies made of a first thermoplastic resin as warp threads 15 and weft threads 16, independently knitting the warp threads 15, and inserting the weft threads 16. Figure 8 is a plan view of the knitted fabric layer 10C.

[0084] As shown in Figure 8, the knitted fabric layer 10C is a layer formed by inserting a weft yarn group F6 into a warp yarn group F5 formed by independently knitting warp yarns 15. The warp yarn group F5 consists of multiple multifilaments 15 extending in the longitudinal direction X, and the weft yarn group F6 consists of multiple flat yarns 16 extending in a direction intersecting the longitudinal direction X. The multifilaments 15 are knitted individually, and the flat yarns 16 are inserted as weft threads. By knitting the fabric, the warp yarns 15 are firmly fixed, and as a result, the weft yarns 16 are also firmly fixed.

[0085] The number of threads per inch of the multiple warp threads 15 that make up warp group F5 can be adjusted as needed, but to obtain appropriate base material strength and ease of tearing by hand, it is usually between 10 and 40 threads per inch.

[0086] The warp threads 15 may be multifilaments consisting of filaments made of the thermoplastic resin described above. Furthermore, multifilaments made not only of filaments made of thermoplastic resin, but also of cotton yarn, rayon yarn, and other materials can be suitably used.

[0087] The average fineness of the warp threads 15 can be adjusted as appropriate, but a fineness of 10 dt to 1000 dt, preferably 20 dt to 500 dt, provides a good balance of base material strength, tearability, and elongation.

[0088] The average fineness of the flat yarn, which is the weft 16, can be adjusted as appropriate, but is preferably between 50 dt and 1000 dt, and more preferably between 100 dt and 500 dt.

[0089] A single-layer flat yarn may be in the form shown in Figure 3(a) above, and a flat yarn comprising a base layer and a binding layer provided on one or both main surfaces of the base layer may be in the form shown in Figures 3(b) to (d) above.

[0090] When the knitted fabric layer 10C described above is used as the support layer 10, it is preferable that the knitted fabric layer 10C is subjected to physical or chemical anchoring treatment (AC treatment). Examples of physical treatments include corona treatment, UV treatment, and sputtering treatment, while examples of chemical treatments include applying a resin selected from organic titanium, isocyanate, polyethyleneimine, and polybutadiene resins. If these AC treatments are not performed, the adhesion between the knitted fabric layer 10C and the laminate layer 20 will be insufficient, resulting in insufficient linearity when the formed adhesive tape is cut by hand, and warp threads may easily protrude as fuzz on the fracture surface, potentially impairing the appearance.

[0091] <Variations of the first to third embodiments> Hereinafter, modified examples of the adhesive tape embodiments comprising the laminates of the first to third embodiments of the present invention will be described based on Figures 9 and 10. Figures 9 and 10 are cross-sectional views of the adhesive tape comprising the laminate 1D according to modified examples of the first to third embodiments of the present invention.

[0092] As shown in Figure 9, the adhesive tape comprising the laminate 1D includes a second laminate layer 20 provided on the main surface T2 side of the laminate 1A. As shown in Figure 9, one main surface T1 of the laminate 1D is formed by an adhesive layer 30, and the other main surface T3 of the laminate 1D is formed by the second laminate layer 20. The above description of the laminate layer 20 also applies to the second laminate layer 20. The two laminate layers 20 comprising the laminate 1D may be layers having the same configuration or layers having different configurations, but it is preferable that the thermoplastic resins constituting both layers both contain biopolyolefins.

[0093] Furthermore, the adhesive tape comprising the laminate 1D includes a second adhesive layer 30 provided on the main surface T3 side of the laminate 1D, as shown in Figure 10. The above description of the adhesive layer 30 also applies to the second adhesive layer 30. The two adhesive layers 30 comprising the laminate 1E may be made of the same material or of different materials.

[0094] <Other Embodiments> Hereinafter, an adhesive tape according to an embodiment of the present invention will be described with reference to Figure 11. Figure 11 is a cross-sectional view of an embodiment of an adhesive tape equipped with a laminate 1A according to the first embodiment of the present invention.

[0095] As shown in Figure 11, the adhesive tape comprises a laminate 1A having a long support layer 10 and a laminate layer 20 provided on one main surface S1 of the support layer 10, and an adhesive layer 30 provided on the main surface side of the support layer 10 of the laminate 1A opposite to the laminate layer 20 side.

[0096] As shown in Figure 11, one main surface T1 of the adhesive tape is formed by an adhesive layer 30, and the other main surface T2 of the adhesive tape is formed by a laminate layer 20 of the laminate 1A.

[0097] The adhesive tape shown in Figure 11 differs from the adhesive tape shown in Figure 2 in terms of the order of lamination, but is otherwise identical. Therefore, the same layers as those in laminate 1A (support layer 10, laminate layer 20) are denoted by the same reference numerals as those in laminate 1A, and the above description relating to laminate 1A applies.

[0098] Furthermore, as a modification of the adhesive tape according to the embodiment shown in Figure 11, a second laminate layer 20 may be provided between the support layer 10 and the adhesive layer 30 (not shown). The above description regarding the laminate 1A also applies to the second laminate layer.

[0099] <Other Embodiments> Various modifications can be made to the first embodiment, second embodiment, third embodiment, and variations of the first to third embodiments of the present invention.

[0100] In the first to third embodiments of the present invention, and in their variations, one or more additional layers may be provided between two adjacent layers or on the outermost layer. For example, in the second embodiment, an adhesive layer may be provided between the support layer 10 and the laminate layer 20, and a replenishing layer may be provided between the support layer 10 and the adhesive layer 30.

[0101] [Adhesive layer] The adhesive layer has the function of enhancing the bonding between the support layer 10 and the laminate layer 20. The adhesive layer is not particularly limited as long as it is a layer that has the function of enhancing bonding, but it is preferably composed of a thermoplastic resin such as low-density polyethylene which has excellent fusion properties. The adhesive layer can be formed, for example, by extruding laminate a thermoplastic resin such as low-density polyethylene onto the surface of the laminate layer 20. The temperature of the extrusion lamination is preferably 130 to 220°C higher than the melting point of the thermoplastic resin material constituting the support layer 10. By performing lamination at a high temperature, the thermoplastic resin material of the adhesive layer penetrates into the support layer 10 and fixes the support layer 10, resulting in improved tearability. The thickness of the adhesive layer is usually 10 μm to 60 μm, preferably 15 μm to 40 μm. When using low-density polyethylene for the adhesive layer, it is preferable to use the plant-derived low-density polyethylene described above.

[0102] [Replenishment layer] The replenishment layer is a layer that facilitates the application of the adhesive when forming the adhesive layer 30 and reinforces the adhesive. For example, when the adhesive layer 30 is provided on the support layer 10, if the layer to which the adhesive is applied is uneven, the adhesive may not be applied uniformly. In such cases, it is preferable to provide a replenishment layer on the support layer 10 to level the surface and then apply the adhesive on the replenishment layer to form the adhesive layer 30. The replenishment layer can be made of a thermoplastic resin such as linear low-density polyethylene or low-density polyethylene. The replenishment layer can be formed, for example, by extruding and laminating a thermoplastic resin such as linear low-density polyethylene or low-density polyethylene onto the support layer 10. In this case as well, it is preferable to use linear low-density polyethylene or low-density polyethylene of plant origin.

[0103] In each embodiment of the present invention and its modifications, layers that impart various functions may be provided. For example, the main surface T2 of the laminate 1A may be provided with a layer to improve surface properties. Specifically, in the case of an adhesive tape in the form of a wound body, a release layer may be provided on the main surface T2 that the adhesive layer 30 contacts in order to reduce the peeling force (also called unwinding force) when unwinding. In addition, the adhesive tape may be provided with a layer made of release paper that has been treated for release, which is the layer that the adhesive layer 30 contacts when the adhesive tape is wound into the form of a wound body. Examples of release treatments include the application of silicone-based release agents, fluorine-based release agents, and long-chain alkyl graft polymer-based release agents that undergo a curing reaction as needed.

[0104] Furthermore, the adhesive tapes in each embodiment of the present invention and their modified versions may be provided with a gas-impermeable layer, such as a metal-deposited film or a ceramic-deposited film, as long as it does not impair the function of the adhesive tape.

[0105] In this invention, it is preferable that the thermoplastic resin materials constituting the adhesive tape, such as the support layer 10, laminate layer 20, adhesive layer, and replenishment layer, are all composed of olefin polymers. Using biopolyolefins can reduce the environmental impact, and using a monomaterial adhesive tape made of the same type of resin improves recyclability, such as waste collection and recycling.

[0106] Furthermore, in the present invention, the peel strength between the support layer and the laminate layer is preferably 2N / 15mm or more, more preferably 5N / 15mm or more, even more preferably 7N / 15mm, and particularly preferably 8N / 15mm or more. By setting the peel strength between the support layer and the laminate layer as described above, the work required to remove the adhesive layer remaining on the adherend can be reduced. There is no upper limit to the peel strength, and a higher strength is preferable. [Examples]

[0107] [Example 1] [Preparing the warp threads] High-density polyethylene (density 0.958 g / cm³) 3 A melt mass flow rate of 0.58 g / 10 min (190°C, 2.16 g load, melting point 134°C) was deposited by inflation molding, and the resulting film was slit by laser cutting. Next, it was stretched seven times on a hot plate at a temperature of 110-120°C, and then subjected to a 6% relaxation heat treatment in a hot air circulating oven at a temperature of 120°C to produce warp threads. The fineness was 130 dt, the flat yarn width was 0.73 mm, and the thickness was 19 μm.

[0108] [Preparing the weft threads] High-density polyethylene (density 0.958 g / cm³) 3A melt mass flow rate of 0.58 g / 10 min (190°C, 2.16 g load, melting point 134°C) was deposited by inflation molding, and the resulting film was slit by laser cutting. Next, it was stretched seven times on a hot plate at a temperature of 110-120°C, and then subjected to a 6% relaxation heat treatment in a hot air circulating oven at a temperature of 120°C to produce a flat yarn for the weft. The fineness was 335 dt, the flat yarn width was 1.20 mm, and the thickness was 29 μm.

[0109] [Preparation of the supporting layer] Using the warp and weft threads obtained above, a plain weave fabric was prepared with a warp thread count of 35 threads / inch and a weft thread count of 16 threads / inch.

[0110] [Manufacturing of laminates] On one side of the woven fabric (support layer) obtained as described above, low-density polyethylene (density 0.922 g / cm³) is applied. 3 Meltmass flow rate 9.4g / 10min (190℃, 2.16g load), melting point 110℃) and plant-derived low-density polyethylene (density 0.918g / cm³) 3 A resin is extruded and laminated with a melt mass flow rate of 8.1 g / 10 min (190°C, 2.16 g load), melting point 105°C, biomass content 95%), in a weight ratio of low-density polyethylene:plant-derived low-density polyethylene = 60:40, and on the other side, low-density polyethylene (density 0.922 g / cm³) is applied. 3 A laminate was fabricated having a three-layer structure of laminate layer / woven fabric (support layer) / laminated layer by extruding and laminating a melt mass flow rate of 9.4 g / 10 min (190°C, 2.16 g load, melting point 110°C) to form a laminate layer with a thickness of 35 μm on each side on both sides of the support layer.

[0111] [Manufacturing of adhesive tape] Corona discharge treatment was performed on the surface of one of the laminate layers of the obtained laminate, which was an extruded laminate containing plant-derived low-density polyethylene. An acrylic adhesive was applied to the surface of the corona-discharged laminate layer to a dry thickness of 40 μm to form an adhesive tape. As the acrylic adhesive, a mixture of 100 parts by weight of acrylic acid ester copolymer (N-3440, manufactured by Mitsubishi Chemical Corporation) and 0.2 parts by weight of toluene solution of acetylacetone aluminum (N-2128, manufactured by Mitsubishi Chemical Corporation), a metal chelating compound, was used as a crosslinking agent.

[0112] [Peel test] From the laminated tape having a three-layer structure obtained in the above adhesive tape manufacturing process, a sample measuring 150 mm in length and 60 mm in width was cut out. A pretreatment agent (Aron Polyprimer H, Toagosei Co., Ltd.) was applied to the corona discharge treated surface of the sample (i.e., the surface of the laminate layer that underwent corona discharge treatment) and dried. Then, an instant adhesive (Aron Alpha 201, Toagosei Co., Ltd.) was applied to the surface coated with the pretreatment agent. Next, the sample was folded so that the side with the instant adhesive applied was facing inward, and the inner surfaces were bonded together. After drying in a 40°C constant temperature bath for 10 minutes, it was left to stand in a 23°C environment for 10 minutes. Subsequently, a piece measuring 100 mm in length and 15 mm in width was cut from the bonded area (where the laminated tape has two layers) to be used as a test specimen. For the test specimens obtained in this manner, a certain length of the laminate layer and support layer was peeled off from the end of the specimen to form a gripping section. Next, in order to measure the peel strength at the interface between the laminate layer and support layer of the laminated tape, the gripping section of the test specimen was fixed to a tensile testing machine (AGS-X, 10N-10kN, Shimadzu Corporation), and peel strength measurement (peeling speed: 100 mm / min) was performed. The peel strength was measured for n=5 specimens, and the average value of these peel strengths was calculated. The calculated average values ​​of the peel strengths are shown in Table 1 below.

[0113] [Comparative Example 1] The laminate was prepared in the same manner as in Example 1, except that the ratio of low-density polyethylene to plant-derived low-density polyethylene was changed to 100:0 when forming the laminate layer. Furthermore, adhesive tapes were prepared using the obtained laminate in the same manner as in Example 1, and peel tests were conducted. The average values ​​of the calculated peel strength are shown in Table 1 below.

[0114] [Example 2] The high-density polyethylene used for the warp and weft threads constituting the support layer is high-density polyethylene (density 0.958 g / cm³). 3 Meltmass flow rate 0.58 g / 10 min (190°C, 2.16 g load), melting point 134°C) and plant-derived high-density polyethylene (density 0.948 g / cm³) 3 A laminate was prepared in the same manner as in Comparative Example 1, except that a resin was used which was a mixture of 1.0 g / 10 min melt mass flow rate (190°C, 2.16 g load), with a melting point of 134°C and a biomass content of 94%, in a weight ratio of high-density polyethylene:plant-derived high-density polyethylene = 95:5. Furthermore, adhesive tapes were prepared using the obtained laminate in the same manner as in Example 1, and peel tests were conducted. The average values ​​of the calculated peel strength are shown in Table 1 below.

[0115] [Example 3] A laminate was prepared in the same manner as in Example 2, except that the high-density polyethylene used for the warp and weft threads constituting the support layer was a resin blended in a ratio of high-density polyethylene to plant-derived high-density polyethylene of 80:20. Furthermore, adhesive tapes were prepared using the obtained laminate in the same manner as in Example 1, and peel tests were conducted. The average values ​​of the calculated peel strength are shown in Table 1 below.

[0116] [Example 4] A laminate was prepared in the same manner as in Example 2, except that the high-density polyethylene used for the warp and weft threads constituting the support layer was a resin blended in a ratio of high-density polyethylene to plant-derived high-density polyethylene of 40:60. Furthermore, adhesive tapes were prepared using the obtained laminate in the same manner as in Example 1, and peel tests were conducted. The average values ​​of the calculated peel strength are shown in Table 1 below.

[0117] [Example 5] A laminate was prepared in the same manner as in Example 2, except that the high-density polyethylene used for the warp and weft threads constituting the support layer was a resin blended in a ratio of high-density polyethylene to plant-derived high-density polyethylene of 20:80. Furthermore, adhesive tapes were prepared using the obtained laminate in the same manner as in Example 1, and peel tests were conducted. The average values ​​of the calculated peel strength are shown in Table 1 below.

[0118] [Example 6] On one side of the woven fabric (support layer), low-density polyethylene (density 0.922 g / cm³) is used. 3 Meltmass flow rate 9.4g / 10min (190℃, 2.16g load), melting point 110℃) and plant-derived low-density polyethylene (density 0.918g / cm³) 3 A laminate was prepared in the same manner as in Example 1, except that a resin was extruded and laminated by mixing 8.1 g / 10 min melt mass flow rate (190°C, 2.16 g load), melting point 105°C, and biomass content 95% with low-density polyethylene:plant-derived low-density polyethylene in a weight ratio of 95:5, and a resin mixed in the same ratio was extruded and laminated to the other side to form laminate layers on both sides of the support layer. Furthermore, adhesive tapes were prepared using the obtained laminate in the same manner as in Example 1, and peel tests were conducted. The average values ​​of the calculated peel strength are shown in Table 1 below.

[0119] [Example 7] A laminate was prepared in the same manner as in Example 6, except that the high-density polyethylene used for the warp and weft threads constituting the support layer was a resin blended in a ratio of high-density polyethylene to plant-derived high-density polyethylene of 95:5. Furthermore, adhesive tapes were prepared using the obtained laminate in the same manner as in Example 1, and peel tests were conducted. The average values ​​of the calculated peel strength are shown in Table 1 below.

[0120] [Example 8] A laminate was prepared in the same manner as in Example 6, except that the high-density polyethylene used for the warp and weft threads constituting the support layer was a resin blended in a ratio of high-density polyethylene to plant-derived high-density polyethylene of 80:20. Furthermore, adhesive tapes were prepared using the obtained laminate in the same manner as in Example 1, and peel tests were conducted. The average values ​​of the calculated peel strength are shown in Table 1 below.

[0121] [Example 9] A laminate was prepared in the same manner as in Example 6, except that the high-density polyethylene used for the warp and weft threads constituting the support layer was a resin blended in a ratio of high-density polyethylene to plant-derived high-density polyethylene of 20:80. Furthermore, adhesive tapes were prepared using the obtained laminate in the same manner as in Example 1, and peel tests were conducted. The average values ​​of the calculated peel strength are shown in Table 1 below.

[0122] [Example 10] On one side of the woven fabric (support layer), low-density polyethylene (density 0.922 g / cm³) is used. 3 Meltmass flow rate 9.4g / 10min (190℃, 2.16g load), melting point 110℃) and plant-derived low-density polyethylene (density 0.918g / cm³) 3 A laminate was prepared in the same manner as in Example 1, except that a resin was extruded and laminated by mixing low-density polyethylene:plant-derived low-density polyethylene (60:40 by weight) with melt mass flow rate of 8.1 g / 10 min (190°C, 2.16 g load), melting point of 105°C, and biomass content of 95%), and a resin mixed in the same ratio was extruded and laminated to the other side to form laminate layers on both sides of the support layer. Furthermore, adhesive tapes were prepared using the obtained laminate in the same manner as in Example 1, and peel tests were conducted. The average values ​​of the calculated peel strength are shown in Table 1 below.

[0123] [Example 11] A laminate was prepared in the same manner as in Example 10, except that the high-density polyethylene used for the warp and weft threads constituting the support layer was a resin blended in a ratio of high-density polyethylene to plant-derived high-density polyethylene of 95:5. Furthermore, adhesive tapes were prepared using the obtained laminate in the same manner as in Example 1, and peel tests were conducted. The average values ​​of the calculated peel strength are shown in Table 1 below.

[0124] [Example 12] A laminate was prepared in the same manner as in Example 10, except that the high-density polyethylene used for the warp and weft threads constituting the support layer was a resin blended in a ratio of high-density polyethylene to plant-derived high-density polyethylene of 80:20. Furthermore, adhesive tapes were prepared using the obtained laminate in the same manner as in Example 1, and peel tests were conducted. The average values ​​of the calculated peel strength are shown in Table 1 below.

[0125] [Example 13] A laminate was prepared in the same manner as in Example 10, except that the high-density polyethylene used for the warp and weft threads constituting the support layer was a resin blended in a ratio of high-density polyethylene to plant-derived high-density polyethylene of 40:60. Furthermore, adhesive tapes were prepared using the obtained laminate in the same manner as in Example 1, and peel tests were conducted. The average values ​​of the calculated peel strength are shown in Table 1 below.

[0126] [Example 14] A laminate was prepared in the same manner as in Example 10, except that the high-density polyethylene used for the warp and weft threads constituting the support layer was a resin blended in a ratio of high-density polyethylene to plant-derived high-density polyethylene of 20:80. Furthermore, an adhesive tape was prepared using the obtained laminate in the same manner as in Example 1, and a peel test was conducted. However, because the peel strength was too high (over 20 N / 15 mm), the adhesive tape broke without peeling between the laminate layer and the support layer.

[0127] [Table 1]

[0128] The adhesive tape using the laminate of the example contains plant-derived low-density polyethylene as at least one of the polyethylene components constituting the laminate layer or the support layer. Therefore, compared to the adhesive tape using the laminate of Comparative Example 1, which uses 100% fossil fuel-derived low-density polyethylene, the environmental impact is reduced. Furthermore, the adhesive tapes using the laminates of Examples 1, 6, and 10 contain plant-derived low-density polyethylene as the polyethylene constituting the laminate layer, and it can be seen that the peel strength between the layers (between the woven fabric layer and the laminate layer) is improved compared to the adhesive tape using the laminate of Comparative Example 1, which does not contain plant-derived low-density polyethylene. Furthermore, the adhesive tapes using the laminates of Examples 2 to 5 contain plant-derived high-density polyethylene as the polyethylene constituting the support layer, and it can be seen that the peel strength between layers (between the woven fabric layer and the laminate layer) is improved compared to the adhesive tape using the laminate of Comparative Example 1, which does not contain plant-derived high-density polyethylene. The adhesive tapes using the laminates of Examples 7-9 and 11-14 contain plant-derived polyethylene in both the laminate layer and the support layer, and it can be seen that the peel strength between the layers (between the woven fabric layer and the laminate layer) is further improved compared to the adhesive tapes using the laminates of Examples 1-6 and 10, in which plant-derived polyethylene is contained in only one of the layers. [Explanation of Symbols]

[0129] 1A~1D...Laminate 10...Support layer 10A·Woven layer 10B ··Cross-bonded fabric layer 10C·Knitted fabric layer 20. Laminating layer 30... Adhesive layer F1... Warp threads F2...weft group 11...warp threads 12...Weft 11A·Base layer 11B...Binding layer

Claims

1. A laminate comprising at least a support layer and a laminate layer provided on one main surface side of the support layer, The support layer consists of a cloth-like body made of linear bodies of a first thermoplastic resin, The support layer is made of a fabric-like material woven from the warp and weft threads, using the first thermoplastic resin filaments as warp and weft threads, wherein the warp and weft threads are tape-shaped flat yarns. The laminate layer is made of a second thermoplastic resin. The second thermoplastic resin contains a plant-derived biopolyolefin and has a biomass content of 10.0% or more. The peel strength between the support layer and the laminate layer is 8 (N / 15 mm) or more. Laminated structure.

2. The laminate according to claim 1, wherein the laminate layer has a thickness of 10 to 200 μm.

3. The laminate according to claim 1, wherein the first thermoplastic resin contains a plant-derived biopolyolefin, and the first thermoplastic resin has a biomass content of 4% or more.

4. The laminate according to claim 1, wherein the biopolyolefin is biopolyethylene.

5. An adhesive tape comprising a laminate according to any one of claims 1 to 4, An adhesive tape comprising an adhesive layer on the main surface side of the laminate of the laminate, opposite to the support layer side, and / or on the main surface side of the support layer, opposite to the laminate layer side.

Images