WO2022075201A1 - Pressure-sensitive adhesive tape - Google Patents

Abstract

The purpose of the present invention is to provide a pressure-sensitive adhesive tape which is inhibited from delaminating, has improved hand tearability, and has improved force of bonding between a lamination layer and base fabric and to which stiffness/firmness has been imparted. The pressure-sensitive adhesive tape comprises base fabric composed of warp yarns and weft yarns, one or more lamination layers disposed over one surface of the base fabric, and a pressure-sensitive adhesive layer disposed on the other surface of the base fabric, wherein (A) the lamination layers are constituted of a thermoplastic resin including polyethylene, the pressure-sensitive adhesive layer is constituted of a rubber-based pressure-sensitive adhesive comprising natural rubber or a synthetic rubber as a main component, and the warp yarns are wooly polyester yarns or wherein (B) the pressure-sensitive adhesive layer is constituted of a rubber-based pressure-sensitive adhesive comprising natural rubber, a synthetic rubber, or a mixture of natural rubber and a synthetic rubber as a main component and the lamination layers comprise a first lamination layer and a second lamination layer in this order from the base fabric side, the first lamination layer comprising low-density polyethylene and either an ethylene/vinyl acetate copolymer or an ethylene/ethyl acrylate copolymer, and the second lamination layer comprising low-density polyethylene and high-density polyethylene.

Description

Adhesive tape

The present invention relates to an adhesive tape suitably used for applications such as packaging and curing.

Adhesive tape is widely used for fixing, bundling, or painting masking of materials in a wide range of fields such as agriculture, civil engineering, construction, and transportation. In addition, such adhesive tapes have adhesiveness that can be attached to various objects, appropriate base material strength, and ease of cutting by hand (hand-cutting property) to improve work convenience. , It is required to have peelability.

As an adhesive tape with improved hand-cutting property, Patent Document 1 uses a base cloth formed by inserting a flat yarn mainly made of a thermoplastic resin into a warp yarn in which a multifilament is independently knitted as a weft yarn. Disclosed is an adhesive tape in which a thermoplastic resin is laminated on the front and back surfaces thereof, and a pressure-sensitive adhesive is applied to one or both sides thereof.

Japanese Unexamined Patent Publication No. 2002-294189

The adhesive tape generally has a structure in which the surface of the base cloth as described above is covered with a laminated layer of a thermoplastic resin and an adhesive layer is formed via an undercoating agent layer, and the adhesive tape having this structure is wound around. It is a product.

Here, when the adhesive tape is attached to the adherend and peeled off, the adhesive remains on the adhered body (hereinafter, this phenomenon is also referred to as "adhesive residue") or is wound. The laminated layer may be peeled off from the adhesive tape (hereinafter, the phenomenon that the laminated layer is peeled off from the base cloth is also referred to as "laminate peeling").

The conventional adhesive tape suppresses the warp (curl) that occurs when the roll of the adhesive tape is rewound, and the warp (copping) in the width direction that occurs when the tension is released after the adhesive tape is rewound. In order to suppress the peeling of the lami, a laminated layer is formed on both sides of the base cloth to integrate the base cloth and the laminated layer. Further, in order to prevent the adhesive residue, a laminated layer is arranged between the base cloth and the adhesive layer, and an undercoating agent is applied to the surface of the laminated layer. These are factors that increase the manufacturing cost of the adhesive tape, such as complicating the production process of the adhesive tape and increasing the number of layers of the laminated layer.

In addition, since the layering of the laminated layer leads to an increase in the thickness of the adhesive tape, there is also a problem that when the adhesive tape is wound, the winding diameter increases, the weight of the wound body increases, and the transportation cost increases. Occur.

Here, if the laminate layer is made into a single layer in order to reduce the material cost and the manufacturing cost, or if the amount of resin and the amount of adhesive in the laminate layer is reduced, the base cloth and the laminate layer or the base cloth and the pressure-sensitive adhesive layer can be reduced. The bonding force with the adhesive is reduced, and adhesive residue and laminating peeling are likely to occur.

In addition, the adhesive tape for packing and curing has the property that the adhesive tape can be easily cut by hand without using cutting tools such as scissors and cutters in order to efficiently perform the packing work and curing work. (Hereinafter, the operation of cutting the adhesive tape without using a cutting tool is called "hand cutting" or "hand cutting", and the performance based on this is called "hand cutting property").

In the conventional adhesive tape, a multifilament yarn (hereinafter, also referred to as "false twist yarn") in which the warp of the base fabric is false-twisted is used, so that the strength of the adhesive tape in the length direction is improved. However, the hand-cutting property deteriorates, and a strong force is required for hand-cutting, and warps that are desired to be sufficiently cut appear on the cut surface, causing fluffing.

Further, since the false twisted yarn has a large yarn diameter, in order to prevent the yarn constituting the base fabric from appearing on the surface of the laminated layer of the adhesive tape or the surface of the adhesive, an amount of laminated resin for embedding the yarn is used. It is necessary to embed the thread in a resin or the like using an adhesive, which causes an increase in the material cost of the adhesive tape.

On the other hand, when the bonding force between the base fabric and the laminated layer decreases, the fixing force at the intersection of the warp and weft constituting the base fabric also decreases, so that the straightness of cutting is impaired during hand cutting, or the laminated layer is used as the base. There is a problem that the hand-cutting property is impaired by peeling from the cloth.

Further, the adhesive tape is required to have a certain stiffness (Stiffness) and elasticity (Anti-laminate stiffness) when it is attached or peeled off, but the number of layers of the adhesive tape is reduced in order to reduce the manufacturing cost. Or, if the laminated layer is made thin, the adhesive tape loses its elasticity and elasticity, which causes a problem that the handleability of the adhesive tape is deteriorated.

In order to solve these problems, the present invention provides an adhesive tape having the following aspects.
(A) An adhesive tape including a base cloth, a laminate layer arranged on one surface of the base cloth, and an adhesive layer arranged on the other side of the base cloth, and the base cloth of the adhesive tape is A woven or knitted fabric composed of warp and weft, the laminate layer is composed of a thermoplastic resin containing polyethylene, and the pressure-sensitive adhesive layer is made of a rubber-based pressure-sensitive adhesive containing natural rubber or synthetic rubber as a main component. The warp is an adhesive tape that is a woolly processed yarn made of polyester.
(B) An adhesive tape containing a base cloth, a laminate layer arranged on one surface of the base cloth, and an adhesive layer arranged on the other side of the base cloth, wherein the base cloth is a warp and a warp. It is a woven or knitted fabric composed of weft threads, the adhesive layer is composed of natural rubber, synthetic rubber, or a rubber-based adhesive containing a mixture of natural rubber and synthetic rubber as a main component, and the laminated layer has a low density. It has a first laminated layer containing polyethylene, an ethylene-vinyl acetate copolymer or an ethylene-ethyl acrylate copolymer, and a second laminated layer containing low-density polyethylene and high-density polyethylene, and the first laminated layer. Is an adhesive tape placed on the base cloth side and the second laminate layer is placed on the back side.

The adhesive tape according to one aspect of the present invention uses a base cloth made of polyester woolly processed yarn as a warp, and has a laminate layer made of a thermoplastic resin containing polyethylene and a pressure-sensitive adhesive layer made of a rubber-based pressure-sensitive adhesive. By combining them, the total thickness is thin, the peeling of the lami and the residual adhesive are suppressed, the hand-cutting property is excellent, and the cost can be reduced by the ease of manufacturing and the reduction of the amount of material used.

Further, the adhesive tape according to another aspect of the present invention is based on a mixture of low-density polyethylene and an ethylene-vinyl acetate copolymer or an ethylene-ethyl acrylate copolymer as the first laminated layer. It is possible to improve the bonding force between the cloth and the laminated layer and suppress the peeling of the lami. Further, when the laminated layer is strongly bonded to the base cloth, the intersections of the warp and weft of the base cloth are strongly bonded, and the hand-cutting property of the adhesive tape is improved.

In the adhesive tape according to one aspect of the present invention, the laminated layer penetrates between the fibers of the base cloth by laminating the first laminated layer made of a resin containing low density polyethylene having a low melting temperature as a main component on the base cloth side. However, the bonding force between the laminated layer and the base fabric can be improved.

The adhesive tape according to one aspect of the present invention heats the first laminated layer by adding an ethylene-vinyl acetate copolymer or an ethylene-ethyl acrylate copolymer to the low-density polyethylene constituting the first laminated layer. The inter-adhesive strength (hot tackiness) is improved, and the bonding strength between the laminate layer and the base fabric can be further improved.

When laminating polyethylene on the base cloth, it is advantageous in terms of productivity to use low-density polyethylene having a low melting temperature and high ductility. However, the adhesive tape is required to have a certain degree of elasticity, and when the laminate layer is composed of only low-density polyethylene or when the same mixed resin as the first laminate layer is used, the elasticity is obtained. I can't. Therefore, in the present invention, the adhesive tape is made firm and firm by adding high-density polyethylene to the second laminated layer.

Note that the melting temperature is high only with high-density polyethylene, and the bonding force with the first laminated layer decreases. Therefore, the adhesive tape of the present invention contains a first laminated layer containing low-density polyethylene as a main component and an ethylene-vinyl acetate copolymer or an ethylene-ethyl acrylate copolymer as a main component, and low-density polyethylene as a main component. By laminating the second laminated layer to which high-density polyethylene is added, the bonding force between the laminated layer and the base cloth is improved, and the adhesive tape is made to have elasticity.

It is a conceptual diagram comparing false plying yarn and woolly processed yarn. It is a conceptual diagram when the laminate layer and the pressure-sensitive adhesive layer are formed on the base cloth. It is the schematic which shows the cross section of the adhesive tape which concerns on one Embodiment of this invention. It is the schematic which shows the cross section of the adhesive tape which concerns on another embodiment of this invention.

<Base cloth>
As the base fabric used for the adhesive tape of the present invention, a woven fabric or a knitted fabric composed of warp and weft of long fibers can be used. The woven structure of the woven fabric can be selected from plain weave, twill weave, satin weave and the like according to various desired characteristics such as cutting direction and strength. Further, the knitted fabric used for the adhesive tape of the present invention is a cloth having a structure in which one of the warp and weft forms a continuous loop and the other is inserted into this loop. Whether the loop is formed in the warp and weft may be determined based on the cutting direction of the target adhesive tape by hand cutting, and the direction perpendicular to the thread forming the loop may be the direction of hand cutting. The warp and weft described below are threads whose extension direction is arranged substantially parallel to the length direction of the adhesive tape, and the warp and weft is a thread whose extension direction is arranged substantially perpendicular to the length direction of the adhesive tape. To say.

(Warp)
Polyesters such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytributylene terephthalate (PTT), polyethylene naphthalate (PEN), and polylactic acid (PLA) are used as the materials for the warp threads of woven and knitted fabrics. Of these, PET, which is particularly versatile, is preferable. Since the polyester fiber used for the warp has a higher melting point than the polyethylene resin constituting the laminated layer, it is possible to prevent the yarn from melting or shrinking when the base fabric is laminated. In addition, polyester fiber has a lower yarn elongation than other synthetic fibers such as polypropylene (PP) and nylon (Ny), so when cutting the adhesive tape by hand in the width direction, the elongation of the warp is suppressed and cut. It is possible to suppress fluffing and fraying of the surface.

As the warp, ordinary false twisted yarn or woolly processed yarn can be used. Woolly processed yarns are filament yarns composed of thermoplastic long fibers that are twisted, heat-set, and then untwisted. Therefore, each single yarn has crimpability as compared with false twisted yarns. , There is little contact between single yarns. Therefore, the adhesive tape can be cut by hand with a weak force without adding frictional resistance between the single yarns during hand cutting. In one aspect of the present invention, polyester woolly processed yarn is used as the warp of the base fabric.

(Warp and weft)
The weft used for the base cloth of the adhesive tape is not particularly limited as long as it does not affect the formation of the laminate layer and the pressure-sensitive adhesive layer, and fibers generally used for the base cloth of the adhesive tape can be used. Woolly processed yarn made of polyester may be used. As a result, the bonding area between the single yarn of the base fabric and the laminate layer and the pressure-sensitive adhesive layer can be further increased as compared with the case where only the warp yarn is used as the woolly processed yarn, and the adhesive residue and the peeling of the lami can be suppressed. Further, the thickness of the base cloth can be further reduced as compared with the case where only the warp yarn is used as the woolly processed yarn, and the amount of the laminating resin or the adhesive for embedding the base cloth can be reduced. Further, when the adhesive tape is required to have hand-cutting property in the vertical direction, the cutting strength of the warp and weft is lowered, so that the hand-cutting property is improved.

Polyethylene false plying may be used as the weft used for the base cloth of the adhesive tape. By using the same material as the laminated layer for the weft, the bonding force between the laminated layer and the base fabric is increased, and the peeling of the laminate can be further suppressed.

Polyethylene flat yarn may be used as the weft used for the base cloth of the adhesive tape. By using the same material as the laminated layer for the weft, the bonding force between the laminated layer and the base fabric is increased, and the peeling of the laminate can be further suppressed. Further, by using the flat yarn as the weft, the bonding area between the laminate layer and the pressure-sensitive adhesive layer and the base fabric can be increased, and the peeling of the laminate and the residue of the pressure-sensitive adhesive can be further suppressed.

The difference between the conventional false twisted yarn and the woolly processed yarn used in the present invention as the warp will be described with reference to the conceptual diagram of the cross section in the fiber direction shown in FIG.
As shown in FIG. 1A, since the false twisted yarn 2 is densely packed with single yarns 1 by false twisting to form one yarn, the false twisted yarn 2 has a large a dimension, which is the thickness of the false twisted yarn 2. On the other hand, since the woolly processed yarn 3 is untwisted, the yarn becomes flat as shown in FIG. 1B when the laminate layer and the adhesive layer are formed on the base fabric described later. , The thickness a'dimension of the woolly processed yarn 3 is smaller than the a dimension.

When the warp and weft of the base cloth are exposed on the surface of the adhesive, the area of the adhesive on the adhesive surface of the adhesive tape decreases, so that the adhesive strength of the adhesive tape decreases. Further, when the warp and weft of the base cloth appear on the surface of the laminated layer, unevenness is generated on the surface of the laminated layer, the appearance is poor when the adhesive tape is attached to the adherend, and the uneven portion is stained. Problems such as occur. Furthermore, if the warps and wefts of the base cloth are exposed on the surface of the adhesive or the base cloth, if the exposed threads absorb water or moisture due to the atmospheric conditions during storage or use of the adhesive tape, the moisture will be absorbed between the laminate layer and the base cloth. It penetrates between the space or between the pressure-sensitive adhesive layer and the base cloth, and the bonding force between the laminate layer or the pressure-sensitive adhesive layer and the base cloth is reduced.

In order to prevent these problems, it is necessary to embed the base cloth with the laminate layer and the pressure-sensitive adhesive layer so that the base cloth does not appear on the surface of the laminate layer and the pressure-sensitive adhesive layer. In that case, the amount of resin and the amount of adhesive used for the woolly processed yarn are smaller than those of the false plyed yarn, and the thickness b'of the laminated layer 4 when the woolly processed yarn 3 shown in FIG. 2 (b) is used. And the total thickness c'of the pressure-sensitive adhesive layer 5 is smaller than the total thickness b of the laminated layer 4 and the thickness c of the pressure-sensitive adhesive layer 5 when the false twisted yarn 2 shown in FIG. 2A is used. Therefore, the amount of resin required for forming the laminated layer 4 and the amount of adhesive required for forming the pressure-sensitive adhesive layer 5 are reduced, and the material cost can be suppressed as compared with the case of using false plying.

Furthermore, in addition to improving the hand-cutting property by using woolly processed yarn for the warp, the cutting strength when cutting the laminated layer and the adhesive layer is also lowered by thinning the laminated layer and the adhesive layer. This makes it easier to cut by hand.

For the weft, false twisted yarn, woolly processed yarn, flat yarn, etc. can be selected according to the performance required for the adhesive tape.

When false twisted yarn is used as a warp and weft, the difference in strength from the warp yarn that is a woolly processed yarn becomes large, so it is easier to cut the adhesive tape by hand in the width direction than by hand cutting in the length direction, and the adhesive tape is made wide. Improves straightness when cutting by hand in the direction.

When the woolly processed yarn is used as the weft, the thickness of the base fabric is further reduced as compared with the case where the woolly processed yarn is used only for the warp, and the amount of resin and adhesive used for the laminate layer is further reduced to make the adhesive tape. Can be thinned. Further, when the hand-cutting property is required in the length direction of the adhesive tape, the woolly processed yarn is used as the weft to reduce the breaking strength in the length direction and improve the hand-cutting property.

Furthermore, by using woolly processed yarn for the weft, the bonding area between the base fabric and the laminate layer and the adhesive layer is increased, and the effect of effectively suppressing the adhesive residue and the peeling of the lami can be obtained.

When flat yarn is used for the weft, the difference in breaking strength from the woolly processed yarn becomes large, and the straightness when cutting by hand in the width direction is improved. Further, by using the flat yarn, the bonding area between the weft and the laminate layer and the pressure-sensitive adhesive layer is increased, and the effect of effectively suppressing the pressure-sensitive adhesive residue and the peeling of the lami can be obtained.

The weft material is polyester such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), polyolefin such as polyethylene (PE) and polypropylene (PP), polyamide such as 6 nylon and 6,6 nylon, rayon, cupra and the like. Regenerated fiber, plant fiber such as cotton and linen, etc. can be used. Further, a fiber obtained by blending fibers of these materials may be used.

Among these materials, if polyethylene similar to the laminated layer is used, the bonding force between the base fabric and the laminated layer is increased, and the peeling of the laminate can be further suppressed. Further, by using the polyethylene fiber, it is possible to improve the hand-cutting property in the length direction of the adhesive tape and improve the processing stability at the time of laminating processing.

The fineness of the warp is preferably 15 denier or more and 80 denier or less, and more preferably 20 denier or more and 70 denier or less. When the fineness of the warp yarn is 15 denier or more, the yarn strength does not become too low, and the weaving process of the base fabric becomes easy. Further, when the fineness of the warp is 70 denier or less, the hand-cutting property of the adhesive tape is not deteriorated.

The fineness of the single yarn constituting the warp is preferably 0.3 denier or more and 4 denier or less, and more preferably 0.5 denier or more and 2 denier or less. Polyester fibers having a single yarn fineness of 0.3 denier or more can obtain sufficient breaking strength even when made into woolly processed yarns, and can suppress deterioration of workability when laminating the base fabric. Further, since the fineness of the single yarn is 4 denier or less, the force required for cutting does not increase, and the hand cutting property is good.

The density of the warp is preferably 20 or more and 180 or less per inch, and more preferably 50 or more and 150 or less. In the case of 20 or more, the warp density does not become too low, the strength in the length direction of the base fabric does not decrease, and the processing when forming the laminated layer on the base cloth becomes easy. Further, when the density of the warp yarns is 180 or less, the number of warp yarns becomes too large and no force is required for hand cutting, and an increase in manufacturing cost can be suppressed.

When a false twisted yarn or a woolly processed yarn is used, the fineness of the fiber used for the weft is preferably 30 denier or more and 250 denier or less, and more preferably 50 denier or more and 200 denier or less. When the fineness of the weft is 30 denier or more, it is possible to prevent the adhesive tape from becoming too thin, and it is possible to suppress the deterioration of the handleability of the adhesive tape. When the amount is 250 denier or less, the surface of the pressure-sensitive adhesive layer is prevented from being uneven and the adhesive performance is not deteriorated, and the resin that embeds the unevenness is manufactured by increasing the amount of the pressure-sensitive adhesive and the amount of the resin. Even if the cost rises, it can be suppressed. When flat yarn is used for the weft, the fineness is preferably 50 denier or more and 500 denier or less. When it is 50 denier or more, the flat yarn does not become too thin and the thermal deterioration of the yarn during the laminating process can be suppressed, and when it is 500 denier or less, the flat yarn does not become too thick and the laminate layer and the adhesive are used. It is possible to prevent an increase in the cost of the adhesive tape by suppressing an increase in the amount of the resin or the adhesive used for the layer.

When using false twisted yarn or woolly processed yarn, the density of the weft is preferably 10 or more and 100 or less per inch, and more preferably 15 or more and 70 or less. When the number of threads is 10 or more, the decrease in the weft density can be suppressed, the strength in the width direction of the base cloth can be maintained, the processing when forming the laminate layer on the base cloth is easy, and the cut surface at the time of hand cutting. The straightness of the is not impaired. When the weft density is 100 or less, the number of wefts does not excessively force the adhesive tape to be cut by hand in the length direction, and the manufacturing cost can be suppressed. When a flat yarn is used for the weft, it is preferably 5 or more and 30 or less per inch, and more preferably 8 or more and 25 or less. When the number of threads is 5 or more, the decrease in the weft density can be suppressed, the strength in the width direction of the base fabric can be maintained, the processing when forming the laminate layer on the base cloth becomes easy, and the cut surface at the time of hand cutting. The straightness of the is not impaired. When the number of wefts is 30 or less, the force required for manually cutting the adhesive tape in the length direction is not excessive, and the manufacturing cost can be suppressed.

In order to increase the bonding force with the laminate layer and the adhesive layer, these forming surfaces of the base fabric may be physically or chemically anchored. Examples of the physical treatment include corona treatment, UV treatment, sputtering treatment and the like, and examples of the chemical treatment include a treatment of applying a resin selected from organic titanium-based, isocyanate-based, polyethyleneimine-based, polybutadiene-based and the like. ..

<Laminate layer>
The laminated layer in the adhesive tape of the present invention is composed of a thermoplastic resin containing polyethylene.
Polyethylene has a melting point of 100 to 150 ° C., which is lower than that of other general-purpose thermoplastic resins such as polypropylene, polyethylene terephthalate, and nylon. Therefore, the melting temperature of the resin when forming the laminated layer on the base fabric is low, and the manufacturing cost can be suppressed.

As the polyethylene, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), high density polyethylene (HDPE) and the like can be used, and a plurality of these types can be mixed and used. By selecting low-density polyethylene, the adhesiveness to the base cloth can be improved, and by selecting high-density polyethylene, a certain degree of hardness can be imparted to the laminated layer and the handleability of the adhesive tape can be improved. It is possible to express various characteristics required for the adhesive tape by selecting the resin composition.
In the present invention, low-density polyethylene means polyethylene having a density of more than 0.911 g / cm ³ and 0.925 g / cm ³ or less, and high-density polyethylene means polyethylene having a density of more than 0.940 g / cm ³ . It is also possible to use medium-density polyethylene having a density of more than 0.925 g / cm ³ and 0.940 g / cm ³ or less as a part of the high-density polyethylene.

Ethylene-vinyl acetate copolymer (EVA), ethylene-ethyl acrylate copolymer (EEA), etc. can be added to the polyethylene resin used for the laminate layer to further improve the bondability with the base fabric.

Specifically, the laminated layer of the adhesive tape according to one aspect of the present invention is mainly composed of a first laminated layer in which LDPE is the main component and a mixture obtained by adding EVA or EEA to the main component is arranged on the base cloth side, and HDPE. It is composed of a second laminated layer in which a mixture of LDPE added to the component is laminated on the first laminated layer. With this configuration, the bonding force between the base cloth and the laminated layer can be improved, and the adhesive tape can have the elasticity and elasticity required for sticking and peeling.

The amount A of LDPE in the first laminated layer is preferably 60 to 95 parts by mass, more preferably 70 to 90 parts by mass. The amount B of EVA or EEA is preferably 5 to 40 parts by mass, more preferably 10 to 30 parts by mass. The total of the quantity A and the quantity B is 100 parts by mass. When the amount B is 5 parts by mass or more, a sufficient bonding force between the laminated layer and the base cloth required for the adhesive tape can be obtained. Further, although the bonding force between the base fabric and the first laminated layer is improved by increasing the amount B, the unit price of EVA and EEA is generally higher than that of LDPE, and the manufacturing cost increases as the amount B increases. .. When the amount B is 40 parts by mass or less, an increase in manufacturing cost can be suppressed, and a mixing ratio can be obtained in which the bonding force between the laminated layer and the base fabric required for the adhesive tape can be obtained.

The amount of resin in the first laminated layer may be an amount that can secure the bonding force with the base fabric required for the adhesive tape, and is 5 g / m ² or more, preferably 10 g / m ² or more, more preferably 20 g / m. It can be ² or more. The upper limit of the amount of resin may be determined according to the function required for the adhesive tape. When the amount of the resin is small, the heat capacity of the first laminated layer is small, and the resin temperature is lowered due to the contact with the base cloth, so that the bonding force between the first laminated layer and the base cloth may not be sufficiently obtained. .. If the amount of the resin is too large, it takes time to cure the resin, so that the production speed is lowered and the productivity is affected. If it is 35 g / m ² or less, the decrease in productivity can be suppressed.

The amount C of HDPE in the second laminated layer is preferably 55 to 90 parts by mass, more preferably 60 to 80 parts by mass. The amount D of LDPE is preferably 10 to 45 parts by mass, more preferably 20 to 40 parts by mass. The total of the quantity C and the quantity D is 100 parts by mass.
When the amount C is 55 parts by mass or more, sufficient elasticity and elasticity required for the adhesive tape can be obtained. Further, when the amount D is 10 parts by mass or more, the fluidity of the mixed resin can be ensured, and the deterioration of the processability of the laminating process can be suppressed. Further, with the above composition ratio, it is possible to prevent the bonding force with the first laminated layer from being lowered and delamination from occurring.

The amount of resin in the second laminated layer can be determined according to the elasticity and elasticity required for the adhesive tape, but is usually 5 g / m ² or more, preferably 7 g / m ² or more, and more preferably 10 g / m ² or more. Is. The upper limit of the amount of resin may be determined according to the function required for the adhesive tape.
The total amount of resin in the first laminated layer and the second laminated layer is equal to or more than the total of the above lower limit values, but is preferably 30 g / m ² or more, more preferably 35 g / m ² or more, still more preferably 40 g / m ² or more. .. The upper limit of the total amount of the resin may be determined according to the function required for the adhesive tape, but the total amount of the resin is preferably 60 g / m ² or less, more preferably 50 g / m ² or less from the viewpoint of hand-cutting property.

<Adhesive layer>
As the pressure-sensitive adhesive layer, a pressure-sensitive adhesive containing natural rubber, synthetic rubber, or a mixture of natural rubber and synthetic rubber as a main component can be used. Since rubber-based adhesives have lower adherend selectivity than acrylic-based adhesives and silicone-based adhesives, they are strongly bonded to both the base fabric and the laminate layer, so that the adhesive residue can be suppressed. can.

As the natural rubber, a sheet rubber obtained by coagulating and drying natural rubber latex with an acid to form a sheet, or a block rubber formed after washing and drying the coagulated small granular rubber can be used.

Sheet rubber includes ribbed smoked sheet (RSS), which is a sheet dried while smoking, and crepe, which is a coagulated product washed with water and then dried with hot air. RSS is classified according to the color tone and the proportion of foreign matter. When the sheet rubber is used as the pressure-sensitive adhesive component of the present invention, only a single grade may be used, or a plurality of grades of the sheet rubber may be mixed and used.

In addition to the standard grade, block rubber includes CV grade to which a viscosity stabilizer is added and L grade to which a discoloration inhibitor is added. When the block rubber is used as the pressure-sensitive adhesive component of the present invention, only a single grade may be used, or a plurality of grades of the block rubber may be mixed and used.

Examples of the synthetic rubber include diene rubber such as isoprene rubber (IR), butadiene rubber (BR) and styrene butadiene rubber (SBR), butyl rubber (IIR), ethylene propylene rubber (EPM) and ethylene propylene diene rubber (EPDM). Synthetic rubber such as non-diene rubber that satisfies various characteristics such as the environment in which the adhesive tape is used and the adhesive strength required for the adhesive tape can be selected and used. For the pressure-sensitive adhesive layer of the present invention, a pressure-sensitive adhesive containing a mixture of natural rubber and synthetic rubber as a main component may be used.

The pressure-sensitive adhesive can include a filler for adjusting the pressure-sensitive adhesive force, a pressure-imparting resin, a plasticizer as a softening component of the pressure-sensitive adhesive, and the like, in addition to the rubber-based pressure-sensitive adhesive as the main component. Examples of the filler include heavy calcium carbonate, carbon black, titanium oxide, talc, cellulose powder and the like, and one of these can be used alone or in combination of two or more. As the tackifying resin, various tackifying resins such as rosin-based resin, terpene-based resin, hydrocarbon-based resin, and phenol-based resin can be used, and one of these may be used alone or in combination of two or more. be able to. As the plasticizer, phthalic acid-based, isophthalic acid-based, terephthalic acid-based, adipic acid-based and their polyester-based plasticizers, phosphoric acid-based plasticizers, epoxy-based plasticizers, etc. are used alone or in combination of two or more. can do.

The pressure-sensitive adhesive may contain various additives known in the field of the present invention in addition to the above-mentioned fillers and the like. Examples of such additives include flame retardants, pigments, antiaging agents, lubricants and the like, and one or a combination of two or more of these can be included.

<Others>
A mold release agent can be applied to the back side of the laminate layer opposite to the base cloth side to form a back treatment layer. By forming the back surface treatment layer, it is possible to prevent the adhesive residue on the surface of the laminated layer when the adhesive tape is wound and the laminating peeling from the base cloth. As the release agent, a long-chain alkyl type release agent (copolymer of stearyl acrylate and acrylic acid, vinyl acetate or acrylonitrile, copolymer of stearyl acrylamide and acrylonitrile or acrylic acid, stearyl vinyl ether and acrylic acid, anhydrous. Examples thereof include copolymers with maleic acid and acrylonitrile), and silicone-based release agents such as addition reaction type, condensation reaction type, cationic polymerization type, and radical polymerization type.

<Manufacturing method>
The method for producing the adhesive tape is not particularly limited, and the adhesive tape can be produced using a known production method. For example, after weaving or knitting the base fabric, a resin containing polyethylene is laminated on one side thereof. As a method of laminating, there are a method of thermally melting a resin containing polyethylene and extruding it onto a base cloth, or a method of laminating a film of a resin containing polyethylene on a base cloth and thermocompression bonding. Further, the surface of the base fabric on which the laminated layer is formed may be physically or chemically anchored in order to improve the adhesion between the base fabric and the laminated layer. Examples of the physical treatment include corona treatment, UV treatment, sputtering treatment and the like, and examples of the chemical treatment include a treatment of applying a resin selected from organic titanium-based, isocyanate-based, polyethyleneimine-based, polybutadiene-based and the like. ..

Specifically, the laminated layer of the adhesive tape according to the embodiment of the present invention first contains LDPE as a main component, and a mixture obtained by adding EVA or EEA to the laminated layer is heat-melted, and then the surface of the base cloth is extruded or the like. A first laminate layer is formed on the surface. Next, a mixture containing HDPE as a main component and LDPE added thereto is thermally melted, and then a second laminated layer is formed on the back surface side of the first laminated layer by extrusion molding or the like.

Next, the pressure-sensitive adhesive composition separately mixed and prepared is applied to the surface of the base fabric opposite to the laminated layer to form the pressure-sensitive adhesive layer. The surface of the base cloth on which the pressure-sensitive adhesive layer is formed may be physically or chemically anchored in order to improve the adhesion between the base cloth and the pressure-sensitive adhesive layer. Examples of the physical treatment include corona treatment, UV treatment, sputtering treatment and the like, and examples of the chemical treatment include a treatment of applying a resin selected from organic titanium-based, isocyanate-based, polyethyleneimine-based, polybutadiene-based and the like. ..

The adhesive layer can be formed using various coating devices. Examples of the coating device include a calendar processing machine, a roll coater, a die coater, a lip coater, a Meyer bar coater, a gravure coater, and the like.

The configuration of the adhesive tape 10 according to the embodiment of the present invention manufactured by the above method will be described with reference to FIGS. 3 (a) to 3 (c). These schematically show the cross section (weft cross section) in the weft orientation direction, and the warp 6 (woolly processed yarn 3) is shown in a simplified manner. FIG. 3 (a) shows a configuration in which a false twisted yarn 7 is used as a weft, FIG. 3 (b) shows a configuration in which a woolly processed yarn 8 is used as a weft, and FIG. 3 (c) shows a flat yarn 9 as a weft. The configuration used is described. In this configuration, woolly processed yarn 3 is used as the warp yarn 6, false twisted yarn 7, woolly processed yarn 8 or flat yarn 9 is used as the weft yarn, and these are plain weave to form a base fabric. A laminating layer 4 is provided on one side of the base cloth, an adhesive layer 5 is provided on the other side, and a mold release agent is applied to the back surface side 10B of the laminated layer to provide a back surface treatment layer 11.
FIG. 4 schematically shows a cross section (warp cross section) in the warp orientation direction of the adhesive tape 20 using two laminated layers as the laminating layer, which is another embodiment of the present invention.
The adhesive tape 20 has a base cloth 14 composed of warp threads 12 and warp threads 13, a laminate layer 15 arranged on one surface of the base cloth 14, and an adhesive layer arranged on the other side of the base cloth 14. It is composed of 16. The laminated layer 15 is composed of a first laminated layer 17 made of a mixture of LDPE and EVA or EEA, and a second laminated layer 18 made of a mixture of HDPE and LDPE. In the configuration shown in FIG. 4, an example in which the back surface treatment layer 19 is formed on the surface of the second laminated layer, which is the back surface side 20B of the adhesive tape 20, is described.

The manufactured adhesive tape is wound into a roll and cut to a predetermined width, and then the side surface is protected with a packaging material such as a polyethylene film or stored in an individual polyethylene film package to make the adhesive adhesive. It can be packed in a box with the side surface of the tape prevented from coming into contact with other adhesive tapes or packing materials.

Hereinafter, the present invention will be specifically described with reference to Examples. However, the present invention is not limited to these examples. In addition, the physical property values of each raw material are the published values such as the manufacturer's catalog values.
The resin materials used in Examples and Comparative Examples are as follows.
LDPE: Product name "NUC8000", HDPE manufactured by Nippon Unicar Co., Ltd. HDPE: Product name "NUC8009", EVA: Product name "E181L" manufactured by Japan Unicar Co., Ltd. EEA: Product name "EA101" manufactured by Dow Chemical Co., Ltd.

Example A1
A polyethylene terephthalate (PET) woolly processed yarn with a fineness of 30 denier and 36 filaments is used as the warp, and a PET false plying yarn with a fineness of 100 denier and 48 filaments is used as the weft. A plain woven fabric was made with a density of books / inch and used as a base cloth.
Low-density polyethylene was laminated on one surface of this base fabric using an extruded laminator to form a laminated layer. The adhesive is 100 parts by mass of natural rubber (RSS # 3) kneaded with a kneader, 160 parts by mass of heavy calcium carbonate (manufactured by Maruo Calcium Co., Ltd., average particle diameter 12 μm) as a filler, and process oil (EMG) as a plasticizer. Lubricants Co., Ltd., trade name "Mobiletherm 610") 30 parts by mass, aliphatic hydrocarbon resin as adhesive-imparting resin (Nippon Zeon Co., Ltd., trade name "Quinton (registered trademark) R100") 100 parts by mass and promotion of kneading A total of 1 part by mass of the agent and the antiaging agent were added, and these were mixed and adjusted. This adhesive was applied to the surface opposite to the surface on which the laminated layer of the base cloth was formed using a calendar coating machine to form an adhesive layer to obtain an adhesive tape having a total thickness of 140 μm. The amount of resin used to prevent the base cloth from appearing on the surface of the laminated layer is 40 g / m ² , and the amount of adhesive used to prevent the base cloth from appearing on the surface of the pressure-sensitive adhesive layer is 40 g / m 2. It was 110 g / m ² .

Example A2
Adhesive tape with a total thickness of 140 μm was applied in the same manner as in Example A1 except that a long-chain alkyl mold release agent (manufactured by Lion Specialty Chemicals Co., Ltd., trade name “Peroyl 1010”) was applied to the back surface of the laminated layer. Obtained. The amount of resin used to form the laminated layer was 40 g / m ² , and the amount of adhesive used to form the pressure-sensitive adhesive layer was 110 g / m ² .

Example A3
An adhesive tape having a total thickness of 140 μm was obtained in the same manner as in Example A1 except that the base cloth before forming the laminated layer was subjected to corona treatment. The amount of resin used to form the laminated layer was 40 g / m ² , and the amount of adhesive used to form the pressure-sensitive adhesive layer was 110 g / m ² .

Example A4
The base fabric before forming the laminate layer was subjected to corona treatment as an anchor treatment, and a long-chain alkyl mold release agent (manufactured by Lion Specialty Chemicals Co., Ltd., trade name "Peroyl 1010") was applied to the back side of the laminate layer. An adhesive tape having a total thickness of 140 μm was obtained in the same manner as in Example A1 except for the above. The amount of resin used to form the laminated layer was 40 g / m ² , and the amount of adhesive used to form the pressure-sensitive adhesive layer was 110 g / m ² .

Example A5
An adhesive tape having a total thickness of 130 μm was obtained in the same manner as in Example A4 except that a PET woolly processed yarn having a fineness of 100 denier and 48 filaments was used as the weft. The amount of resin used to form the laminate layer was 35 g / m ² , and the amount of adhesive used to form the pressure-sensitive adhesive layer was 90 g / m ² .

Example A6
An adhesive tape having a total thickness of 140 μm was obtained in the same manner as in Example A4 except that a false twisted yarn made of HDPE having a fineness of 100 denier and 48 filaments was used as the weft. The amount of resin used to form the laminated layer was 40 g / m ² , and the amount of adhesive used to form the pressure-sensitive adhesive layer was 110 g / m ² .

Example A7
An adhesive tape having a total thickness of 135 μm was obtained in the same manner as in Example A4 except that HDPE flat yarn having a fineness of 300 denier was used as a weft at a density of 17 threads per inch. The amount of resin used to form the laminate layer was 35 g / m ² , and the amount of adhesive used to form the pressure-sensitive adhesive layer was 100 g / m ² .

Example A8
As an adhesive, EPDM (manufactured by Sumitomo Chemical Co., Ltd., trade name "Esplen # 301") 100 parts by mass, heavy calcium carbonate (manufactured by Maruo Calcium Co., Ltd., average particle size 12 μm) 170 parts by mass, naphthenic process oil (Nippon Sun Oil Co., Ltd.) 15 parts by mass of product name "SUNTHENE 4240"), 30 parts by mass of aliphatic hydrocarbon resin (manufactured by Nippon Zeon, product name "Quinton (registered trademark) N180") and kneading accelerator, lubricant and anti-aging agent A total of 2 parts by mass was added, and an adhesive tape having a total thickness of 135 μm was obtained in the same manner as in Example A5 except that a mixture thereof was used. The amount of resin used to form the laminate layer was 35 g / m ² , and the amount of adhesive used to form the pressure-sensitive adhesive layer was 95 g / m ² .

Example A9
As an adhesive, 70 parts by mass of natural rubber (RSS # 3), 30 parts by mass of EPDM (manufactured by Sumitomo Chemical Co., Ltd., trade name "Esplen # 301"), heavy calcium carbonate (manufactured by Maruo Calcium Co., Ltd., average particle diameter 12 μm) 170 By mass, 15 parts by mass of naphthenic process oil (manufactured by Nippon Sun Oil Co., Ltd., trade name "SUNTHENE4240"), 30 parts by mass of aliphatic hydrocarbon resin (manufactured by Nippon Zeon Co., Ltd., trade name "Quinton (registered trademark) N180") A total of 2 parts by mass of a kneading accelerator, a lubricant and an antioxidant were added, and a mixture thereof was used in the same manner as in Example A5 to obtain an adhesive tape having a total thickness of 135 μm. The amount of resin used to form the laminate layer was 35 g / m ² , and the amount of adhesive used to form the pressure-sensitive adhesive layer was 100 g / m ² .

Example A10
An adhesive tape having a total thickness of 120 μm was obtained in the same manner as in Example A5 except that a PET woolly processed yarn having a fineness of 15 denier and 12 filaments was used as the warp. The amount of resin used to form the laminated layer was 30 g / m ² , and the amount of adhesive used to form the pressure-sensitive adhesive layer was 100 g / m ² .

Example A11
An adhesive tape having a total thickness of 140 μm was obtained in the same manner as in Example A5 except that a PET woolly processed yarn having a fineness of 75 denier and 48 filaments was used as the warp. The amount of resin used to form the laminated layer was 40 g / m ² , and the amount of adhesive used to form the pressure-sensitive adhesive layer was 100 g / m ² .

Example A12
An adhesive tape having a total thickness of 140 μm was obtained in the same manner as in Example A5 except that a PET woolly processed yarn having a fineness of 75 denier and 24 filaments was used as the warp. The amount of resin used to form the laminated layer was 40 g / m ² , and the amount of adhesive used to form the pressure-sensitive adhesive layer was 115 g / m ² .

Example A13
An adhesive tape having a total thickness of 130 μm was obtained in the same manner as in Example A5 except that the warp density was set to 20 threads / inch. The amount of resin used to form the laminated layer was 35 g / m ² , and the amount of adhesive used to form the pressure-sensitive adhesive layer was 110 g / m ² .

Example A14
An adhesive tape having a total thickness of 150 μm was obtained in the same manner as in Example A5 except that the warp density was 150 threads / inch. The amount of resin used to form the laminate layer was 35 g / m ² , and the amount of adhesive used to form the pressure-sensitive adhesive layer was 95 g / m ² .

Example A15
A PET woolly processed yarn with a fineness of 30 denier and 36 filaments is used as the warp, and an HDPE false plying yarn with a fineness of 100 denier and 48 filaments is used as the weft. As the density, we knit a vertical knitted fabric in which the warp is an independent chain knit. An adhesive tape having a total thickness of 140 μm was obtained in the same manner as in Example A6 except that this vertical knitted fabric was used as a base cloth. The amount of resin used to form the laminated layer was 40 g / m ² , and the amount of adhesive used to form the pressure-sensitive adhesive layer was 110 g / m ² .

Example A16
A PET woolly processed yarn with a fineness of 30 denier and 36 filaments is used as the warp, and a PET woolly processed yarn with a fineness of 100 denier and 48 filaments is used as the weft. A plain woven fabric was made with the density of the above and used as a base cloth. High-density polyethylene was laminated on one surface of the base fabric using an extruded laminator, and low-density polyethylene was further laminated on the high-density polyethylene using an extruded laminator to form a laminated layer. Next, the same adhesive as in Example A1 was applied to the other surface of the base cloth using a calendar coating machine to form an adhesive layer to obtain an adhesive tape having a total thickness of 130 μm. The total amount of resin used to prevent the base cloth from appearing on the surface of the laminated layer is 35 g / m ² , and the amount of adhesive used to prevent the base cloth from appearing on the surface of the adhesive layer. Was 90 g / m ² .

Comparative Example A1
When an attempt was made to laminate the PET resin using the base cloth subjected to the same anchor treatment as in Example A4 and the extruded laminator used in Example A1, the ductility of the molten resin was poor and the laminate layer was formed. Since it took time, the trial production was canceled.

Comparative Example A2
When an attempt was made to laminate the PP resin using the base cloth subjected to the same anchor treatment as in Example A4 and the extruded laminator used in Example A1, the ductility of the molten resin was poor and the laminate layer was formed. Since it took time, the trial production was canceled.

Comparative Example A3
An adhesive tape having a total thickness of 145 μm was obtained in the same manner as in Example A4 except that a PET falsely twisted yarn having a fineness of 30 denier and 36 filaments was used as the warp. The amount of resin used to form the laminated layer was 45 g / m ² , and the amount of adhesive used to form the pressure-sensitive adhesive layer was 110 g / m ² .

Comparative Example A4
An adhesive tape having a total thickness of 130 μm was obtained in the same manner as in Example A4 except that a PET falsely twisted yarn having a fineness of 15 denier and 12 filaments was used as the warp. The amount of resin used to form the laminate layer was 35 g / m ² , and the amount of adhesive used to form the pressure-sensitive adhesive layer was 100 g / m ² .

Comparative Example A5
An adhesive tape having a total thickness of 150 μm was obtained in the same manner as in Example A4 except that a woolly processed yarn made of 6 nylon (PA6) having a fineness of 30 denier and 12 filaments was used as the warp. The amount of resin used to form the laminated layer was 40 g / m ² , and the amount of adhesive used to form the pressure-sensitive adhesive layer was 115 g / m ² .

Comparative Example A6
Same as Example A5 except that 0.2 g of a curing agent (Soken Kagaku, L45) was added per 100 g of an acrylic pressure-sensitive adhesive (Soken Kagaku, SK Dyne 702L) and the viscosity was adjusted with ethyl acetate. An adhesive tape having a layer thickness of 125 μm was obtained. The amount of resin used to form the laminated layer was 38 g / m ² , and the amount of adhesive used to form the pressure-sensitive adhesive layer was 63 g / m ² .

Reference example A1
A PET woolly processed yarn having a fineness of 100 denier and 96 filaments was used as the warp, and an adhesive tape having a total thickness of 160 μm was obtained in the same manner as in Example A4 except that the density of the warp was 60 yarns / inch. The amount of resin used to form the laminate layer was 55 g / m ² , and the amount of adhesive used to form the pressure-sensitive adhesive layer was 125 g / m ² .

Reference example A2
A PET woolly processed yarn having a fineness of 100 denier and 24 filaments was used as the warp, and an adhesive tape having a total thickness of 170 μm was obtained in the same manner as in Example A4 except that the density of the warp was 60 yarns / inch. The amount of resin used to form the laminated layer was 60 g / m ² , and the amount of adhesive used to form the pressure-sensitive adhesive layer was 130 g / m ² .

Reference example A3
A PET woolly processed yarn having a fineness of 36 denier and a filament number of 36 was used as the warp, and an adhesive tape having a total thickness of 130 μm was obtained in the same manner as in Example A4 except that the density of the warp was 15 yarns / inch. The amount of resin used to form the laminated layer was 40 g / m ² , and the amount of adhesive used to form the pressure-sensitive adhesive layer was 100 g / m ² .

Reference example A4
A PET woolly processed yarn having a fineness of 15 denier and 12 filaments was used as the warp, and an adhesive tape having a total thickness of 160 μm was obtained in the same manner as in Example A4 except that the density of the warp was 190 yarns / inch. The amount of resin used to form the laminated layer was 50 g / m ² , and the amount of adhesive used to form the pressure-sensitive adhesive layer was 120 g / m ² .

<Evaluation method>
Various characteristics of the adhesive tapes obtained as Examples A1 to A16, Comparative Examples A1 to A6, and Reference Examples A1 to A5 were evaluated by the following methods. The results are shown in Tables 1 to 4.

[Creating a sample for evaluation]
The original fabrics of the adhesive tapes obtained in Examples A1 to A16, Comparative Examples A1 to A6, and Reference Examples A1 to A5 were divided into wound products having a winding amount of 25 m, and then cut into 50 mm widths to prepare samples for evaluation. ..

[Thickness]
The total thickness of the adhesive tape was measured based on the thickness measuring method specified by JIS Z 0237: 2009.

[Remaining adhesive]
A measurement sample was prepared according to the method for measuring the adhesive strength of JIS Z 0237: 2009. After storing this sample in an atmosphere of a temperature of 23 ± 1 ° C. and a relative humidity of 50 ± 5% for 72 hours, the adhesive tape was removed from the test plate by the same method as the method of measuring the adhesive strength by peeling 180 ° to the test plate. It was peeled off. The test plate after peeling was visually observed, the number of test pieces to which the adhesive was attached was counted, and the evaluation was performed based on the following criteria.
〇 〇 〇 No adhesive remaining 〇 〇 Adhesive remaining occurrence rate less than 3% 〇 Adhesive remaining occurrence rate less than 5% △ Adhesive remaining occurrence rate less than 10% × Adhesive remaining occurrence rate 10% or more

[Lami peeling]
The evaluation sample in the wound state was stored for 24 hours in an atmosphere having a temperature of 65 ° C. and a relative humidity of 80%, and then peeled off by hand for 1 m. The adhesive tape after peeling was visually observed, the number of test pieces from which the laminated layer of the adhesive tape was peeled from the substrate was counted, and evaluation was performed based on the following criteria.
〇 〇 〇 No lambs peeling 〇 〇 Lami peeling occurrence rate less than 3% 〇 Lami peeling occurrence rate less than 5% △ Lami peeling occurrence rate less than 10% × Lami peeling occurrence rate 10% or more

[Hand cutting]
An adhesive tape having a width of 50 mm and a roll of 25 m was cut by hand every 1 m, and the number of fluffs having a maximum fluff of more than 2 mm among the fluffs generated in the cut portions was counted. The number of cutting points was 100 for each sample.
〇 〇 〇 No fluffing 〇 〇 fluffing occurrence rate less than 5% 〇 fluffing occurrence rate less than 10% △ fluffing occurrence rate less than 20% × fluffing occurrence rate 20% or more

[Tear strength]
A measurement sample was taken from the original fabric of the adhesive tape before being cut to a width of 50 mm, and the measurement was performed according to the method for measuring the tear strength of JIS Z 0237: 2009.

Example B1
A polyethylene terephthalate (PET) woolly processed yarn with a fineness of 30 denier and 36 filaments is used as the warp, and a PET false plying yarn with a fineness of 100 denier and 48 filaments is used as the weft. A plain woven fabric was made with a density of books / inch and used as a base cloth.
After corona-treating one surface of this base cloth, a mixed resin of 80 parts by mass of LDPE and 20 parts by mass of EVA (hereinafter referred to as composition ratio 80:20) is applied to the corona-treated surface using an extruded laminator in a resin amount of 27 g / The first laminated layer was formed by laminating at ^m2 . Then, using an extruded laminator, a mixed resin of HDPE: LDPE = 70: 30 (composition ratio) was laminated on the surface of the first laminate layer at a resin amount of 13 g / m ² to form a second laminate layer, and the second laminate was formed. A long-chain alkyl release agent (manufactured by Lion Specialty Chemicals Co., Ltd., trade name "Peroyl 1010") was applied to the surface of the layer to form a back surface treatment layer. The adhesive is 100 parts by mass of kneaded natural rubber (RSS # 3), 160 parts by mass of heavy calcium carbonate (manufactured by Maruo Calcium Co., Ltd., average particle size 12 μm) as a filler, and process oil (EMG Lubricants) as a plasticizer. Manufactured by, trade name "Mobiletherm 610") 30 parts by mass, as a tackifier resin, an aliphatic hydrocarbon resin (manufactured by Nippon Zeon Co., Ltd., trade name "Quinton (registered trademark) R100") 100 parts by mass and a kneading accelerator A total of 1 part by mass of an antioxidant was added, and these were mixed to prepare. This adhesive was applied to the surface opposite to the surface on which the laminated layer of the base fabric was formed using a calendar coating machine to form an adhesive layer, and an adhesive tape having a total thickness of 140 μm was produced.

Example B2
An adhesive tape having a total thickness of 140 μm was produced in the same manner as in Example B1 except that EVA of the first laminated layer was replaced with EEA and the composition ratio was changed to LDPE: EEA = 80: 20.

Example B3
An adhesive tape having a total thickness of 140 μm was produced in the same manner as in Example B2 except that the composition ratio of the first laminated layer was LDPE: EEA = 60: 40.

Example B4
An adhesive tape having a total thickness of 140 μm was produced in the same manner as in Example B2 except that the composition ratio of the first laminated layer was LDPE: EEA = 95: 5.

Example B5
An adhesive tape having a total thickness of 140 μm was produced in the same manner as in Example B2 except that the composition ratio of the second laminated layer was HDPE: LDPE = 55: 45.

Example B6
An adhesive tape having a total thickness of 140 μm was produced in the same manner as in Example B2 except that the composition ratio of the second laminated layer was HDPE: LDPE = 90:10.

Example B7
An adhesive tape having a total thickness of 140 μm was produced in the same manner as in Example B2 except that the amount of resin in the first laminated layer was 20 g / m ² and the amount of resin in the second laminated layer was 20 g / m ² .

Example B8
An adhesive tape having a total thickness of 140 μm was produced in the same manner as in Example B2 except that the amount of resin in the first laminated layer was 10 g / m ² and the amount of resin in the second laminated layer was 30 g / m ² .

Example B9
An adhesive tape having a total thickness of 140 μm was produced in the same manner as in Example B2 except that the amount of resin in the first laminated layer was 30 g / m ² and the amount of resin in the second laminated layer was 10 g / m ² .

Example B10
An adhesive tape having a total thickness of 140 μm was produced in the same manner as in Example B2 except that the amount of resin in the first laminated layer was 33 g / m ² and the amount of resin in the second laminated layer was 7 g / m ² .

Example B11
The same as in Example 2 except that the amount of resin in the first laminated layer was 24 g / m ² , the amount of resin in the second laminated layer was 11 g / m ² , and the total amount of resin in the laminated layer was 35 g / m ² . , An adhesive tape having a total thickness of 135 μm was prepared.

Example B12
The same as in Example B2 except that the amount of resin in the first laminated layer was 30 g / m ² , the amount of resin in the second laminated layer was 15 g / m ² , and the total amount of resin in the laminated layer was 45 g / m ² . , An adhesive tape having a total thickness of 150 μm was prepared.

Example B13
An adhesive tape having a total thickness of 140 μm was produced in the same manner as in Example B1 except that the amount of resin in the first laminated layer was 5 g / m ² and the amount of resin in the second laminated layer was 35 g / m ² .

Example B14
An adhesive tape having a total thickness of 140 μm was produced in the same manner as in Example B1 except that the amount of resin in the first laminated layer was 35 g / m ² and the amount of resin in the second laminated layer was 5 g / m ² .

Example B15
An adhesive tape having a total thickness of 140 μm was produced in the same manner as in Example B1 except that the amount of resin in the first laminated layer was 20 g / m ² and the amount of resin in the second laminated layer was 10 g / m ² .

Comparative Example B1
A polyethylene terephthalate (PET) woolly processed yarn with a fineness of 30 denier and 36 filaments is used as the warp, and a PET false plying yarn with a fineness of 100 denier and 48 filaments is used as the weft. A plain woven fabric was made with a density of books / inch and used as a base cloth. After corona-treating one surface of the base fabric, LDPE was laminated on the corona-treated surface with a resin amount of 40 g / m ² using an extruded laminator to form a laminated layer. Then, a long-chain alkyl mold release agent (manufactured by Lion Specialty Chemicals Co., Ltd., trade name "Peroyl 1010") was applied to the surface of the laminated layer to form a back surface treatment layer. The adhesive is 100 parts by mass of natural rubber (RSS # 3) kneaded with a kneader, 160 parts by mass of heavy calcium carbonate (manufactured by Maruo Calcium Co., Ltd., average particle size 12 μm) as a filler, and process oil (EMG) as a plasticizer. Lubricants Co., Ltd., trade name "Mobiletherm 610") 30 parts by mass, aliphatic hydrocarbon resin as adhesive-imparting resin (Nippon Zeon Co., Ltd., trade name "Quinton (registered trademark) R100") 100 parts by mass and promotion of kneading A total of 1 part by mass of the agent and the antiaging agent were added, and these were mixed and adjusted. This adhesive was applied to the surface opposite to the surface on which the laminated layer of the base fabric was formed using a calendar coating machine to form an adhesive layer, and an adhesive tape having a total thickness of 135 μm was produced.

Comparative Example B2
An adhesive tape having a total thickness of 140 μm was produced in the same manner as in Comparative Example B1 except that the LDPE used for the laminated layer was HDPE.

Comparative Example B3
The same as in Comparative Example B1 except that the laminated layer was formed by laminating LDPE on the corona-treated surface of the base cloth at a resin amount of 27 g / m ² and then further laminating LDPE at a resin amount of 13 g / m ² . , An adhesive tape having a total thickness of 140 μm was prepared.

Comparative Example B4
Similar to Comparative Example B1 except that a laminated layer was formed by laminating LDPE on the corona-treated surface of the base cloth at a resin amount of 27 g / m ² and then further laminating HDPE at a resin amount of 13 g / m ² . , An adhesive tape having a total thickness of 140 μm was prepared.

Comparative Example B5
An adhesive tape having a total thickness of 140 μm was produced in the same manner as in Example B2 except that the resin of the second laminated layer was only HDPE.

Comparative Example B6
An adhesive tape having a total thickness of 140 μm was produced in the same manner as in Example B1 except that the resin of the first laminated layer was only LDPE.

<Evaluation method>
Various characteristics of the adhesive tapes obtained as Examples B1 to B15 and Comparative Examples B1 to B6 were evaluated by the following methods. The results are shown in Tables 5-7.

[Lami adhesive strength]
A test piece having a width of 25 mm × 200 mm is collected from the adhesive tape base material laminated on the base cloth. Peel off the base cloth and the laminated layer of the test piece from the end by about 75 mm, and grasp the base cloth side by about 25 mm on the upper chuck of the tensile tester (JIS B 7721). The laminate was pulled at a gripping interval of 100 mm and a tensile speed of 300 ± 30 mm / min, and the weight of the laminated layer peeling off from the base fabric was measured.

[Rewind test]
The roll-shaped adhesive tape was heated at 70 ° C. for 24 hours, and the tape was quickly unwound at a high speed with a length of about 1 m by hand, and it was confirmed whether or not the tape backing agent had peeled off.

[Rigidity]
A measurement sample was taken from the adhesive tape and measured according to the JIS P 8125 stiffness test method.

[Tear strength]
A measurement sample was taken from the adhesive tape, and the measurement was performed according to the method for measuring the tear strength of JIS Z 0237: 2009.

[Hand cutting]
An adhesive tape having a width of 50 mm and a roll of 25 m was cut by hand every 1 m, and the number of fluffs having a maximum fluff of more than 2 mm among the fluffs generated in the cut portions was counted. The number of cutting points was 100 for each sample.
〇 Fluffing occurrence rate less than 5% △ Fluffing 5% or more and less than 10% × Fluffing occurrence rate 10% or more or cannot be cut by hand

In Comparative Examples B1 to B4 and B6 in which EVA or EEA was not used for the laminated layer, the bonding force between the base cloth and the laminated layer was weak, so that the base cloth and the laminated layer were peeled off at the time of hand cutting, and the adhesive tape was separated in the width direction. (In Table 7, the evaluation of "hand-cutting property" is "x"). On the other hand, in Examples B1 to B15 in which EVA or EEA was used for the laminated layer, manual cutting was possible and the fluffing of the cut portion was small. In Comparative Example B5, there was no problem in the hand-cutting property of the adhesive tape, but delamination occurred between the first laminated layer and the second laminated layer in the rewinding test.

Further, in Comparative Examples B1 to B4 and B6, the sample did not break in the measurement of the tear strength and the tear strength could not be measured, but in Examples B1 to B15, the break strength could be measured. The measured value was also relatively small.

Further, in the embodiment in which EVA or EEA is used for the first laminated layer, the laminating adhesive strength is higher than that of Comparative Examples B1 to B4 and B6, and even when the laminated layers are not arranged on both sides of the base cloth, the laminated cloth and the base cloth are used. It can be seen that the laminate layer is firmly bonded.

1 Single yarn 2 False twisted yarn 3 Woolly processed yarn 4 Laminated layer 5 Adhesive layer 6 Warp 7 False twisted yarn 8 Woolly processed yarn 9 Flat yarn 10, 20 Adhesive tape 10B, 20B Back side 11, 19 Back treatment layer 12 Warp 13 Weft 14 Base cloth 15 Laminate layer 17 First laminate layer 18 Second laminate layer

Claims (9)

1. With the base cloth,
   A laminated layer arranged on one surface of the base fabric and
   An adhesive layer disposed on the other side of the base fabric and
   Adhesive tape containing
   The base fabric is a woven fabric or knitted fabric composed of warp and weft.
   The laminated layer is made of a thermoplastic resin containing polyethylene, and is composed of a thermoplastic resin.
   The pressure-sensitive adhesive layer is composed of a rubber-based pressure-sensitive adhesive containing natural rubber, synthetic rubber, or a mixture of natural rubber and synthetic rubber as a main component.
   The warp is a polyester woolly processed yarn.
   Adhesive tape.
2. The adhesive tape according to claim 1, wherein the weft is a polyester woolly processed yarn.
3. The adhesive tape according to claim 1, wherein the weft is a polyethylene false twisted yarn.
4. The adhesive tape according to claim 1, wherein the weft is a polyethylene flat yarn.
5. A base cloth composed of warps and wefts,
   A laminated layer arranged on one surface of the base fabric and
   An adhesive layer disposed on the other side of the base fabric and
   Adhesive tape containing
   The pressure-sensitive adhesive layer is composed of a rubber-based pressure-sensitive adhesive containing natural rubber, synthetic rubber, or a mixture of natural rubber and synthetic rubber as a main component.
   The laminated layer has a first laminated layer and a second laminated layer from the base cloth side.
   The first laminated layer contains low density polyethylene and an ethylene-vinyl acetate copolymer or an ethylene-ethyl acrylate copolymer.
   The second laminated layer is an adhesive tape containing low-density polyethylene and high-density polyethylene.
6. In the first laminated layer, the amount A of the low-density polyethylene is 60 to 95 parts by mass, and the amount B of the ethylene-vinyl acetate copolymer or the ethylene-ethyl acrylate copolymer is 5 to 40 parts by mass ( However, the adhesive tape according to claim 5, wherein the total amount of the amount A and the amount B is 100 parts by mass).
7. In the second laminated layer, the amount C of the high-density polyethylene is 55 to 90 parts by mass, and the amount D of the low-density polyethylene is 10 to 45 parts by mass (however, the total of the amount C and the amount D is 100 parts by mass). The adhesive tape according to claim 5 or 6.
8. The one according to any one of claims 5 to 7, wherein the resin amount of the first laminated layer is 10 g / m ² or more and 35 g / m ² or less, and the total resin amount of the laminated layer is 30 g / m ² or more. The listed adhesive tape.
9. According to any one of claims 5 to 7, the resin amount of the second laminated layer is 10 g / m ² or more and 35 g / m ² or less, and the total resin amount of the laminated layer is 30 g / m ² or more. The listed adhesive tape.

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