KR20230074808A - adhesive tape - Google Patents

Abstract

In order to provide an adhesive tape that suppresses peeling of the laminate layer, improves hand-cutting properties, improves bonding strength between the laminate layer and the base fabric, and gives the adhesive tape rigidity and elasticity, the base fabric constituted by warp and weft yarns. and a laminate layer disposed on one surface of the base fabric, and an adhesive layer disposed on the other surface of the base fabric, wherein (A) the laminate layer is constituted by a thermoplastic resin containing polyethylene; , The pressure-sensitive adhesive layer is composed of a rubber-based pressure-sensitive adhesive containing natural rubber or synthetic rubber as a main component, and the warp is a woolly processed yarn made of polyester, or (B) the pressure-sensitive adhesive layer is composed of natural rubber, synthetic rubber, or natural rubber. It is composed of a rubber-based pressure-sensitive adhesive containing a mixture of synthetic rubber as a main component, and the laminate layer has a first laminate layer and a second laminate layer from the base fabric side, the first laminate layer comprising low-density polyethylene and ethylene-acetic acid An adhesive tape comprising a vinyl copolymer or an ethylene-ethyl acrylate copolymer, wherein the second laminate layer contains low-density polyethylene and high-density polyethylene.

Description

adhesive tape

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

BACKGROUND OF THE INVENTION [0002] Adhesive tapes are widely used for fixing and binding materials or for masking paint in a wide range of fields such as agriculture, civil engineering, construction, transportation, and the like. In addition, such an adhesive tape is required to have adhesiveness capable of sticking to various objects, appropriate substrate strength, ease of cutting by hand (hand cutting ability) and peelability for improving work convenience. .

As such an adhesive tape with improved hand cutting property, in Patent Document 1, a base fabric formed by inserting a flat yarn mainly composed of a thermoplastic resin as a weft yarn into a warp yarn independently woven of multifilaments is used, and the front and back surfaces thereof An adhesive tape in which a thermoplastic resin is laminated and a pressure-sensitive adhesive is coated on one side or both sides thereof is disclosed.

Japanese Unexamined Patent Publication No. 2002-294189

As for the adhesive tape, a structure in which the surface of the base fabric described above is covered with a laminate layer of a thermoplastic resin and an adhesive layer is formed through a primer layer is common, and the adhesive tape having this structure is wound to make a product.

Here, when the adhesive tape is applied to the adherend and peeling is performed, the adhesive remains on the adherend (hereinafter, this phenomenon is also referred to as "adhesive remaining"), or the laminate layer peels off from the rolled adhesive tape (Hereinafter, the phenomenon in which the laminate layer peels off from the bubbles is also referred to as "laminate layer peeling").

Conventional adhesive tapes suppress warpage (curl) that occurs when a roll of adhesive tape is rewound, or warpage (cuffing) in the width direction that occurs when tension is relaxed after rewinding the adhesive tape, or a laminate layer In order to suppress peeling or the like, laminate layers are formed on both surfaces of the base fabric to integrate the base fabric and the laminate layer. Further, in order to prevent the adhesive from remaining, a laminate layer is disposed between the base fabric and the adhesive layer, and a primer is applied to the surface of the laminate layer. These are factors that increase the manufacturing cost of the adhesive tape, such as complicating the production process of the adhesive tape and multilayering the laminate layer.

In addition, multilayering of the laminate layer leads to an increase in the thickness of the adhesive tape, so that when the adhesive tape is wound, the winding diameter increases, the weight of the winding object increases, and the transportation cost increases.

Here, if the laminate layer is made single-layered or the amount of resin or adhesive in the laminate layer is reduced in order to reduce material cost, manufacturing cost, etc., the bonding strength between the base fabric and the laminate layer or between the base fabric and the adhesive layer is reduced, and the adhesive remains. However, peeling of the laminate layer occurs easily.

In addition, adhesive tapes for packing and curing are required to have the property that the adhesive tape can be easily cut by hand without using cutting tools such as scissors or cutters in order to efficiently carry out packing and curing operations. (Hereinafter, the operation of cutting the adhesive tape without using a cutting tool is referred to as "hand cutting" or "hand cutting", and the performance based on this is referred to as "hand cutting ability").

In conventional adhesive tapes, since multifilament yarns (hereinafter also referred to as "twisted yarns") in which false twisting is applied to warps of the base fabric are used, the strength of the adhesive tape in the longitudinal direction is improved, but the hand cutting property is deteriorated. As a result, there is also a problem that strong force is required at the time of hand cutting, or a warp that is not sufficiently cut appears on the cut surface and fluff is generated.

In addition, since false-twist yarns have a large yarn diameter, in order to prevent the yarns constituting the base fabric from appearing on the surface of the laminate layer or the surface of the adhesive, a laminate resin or adhesive in an amount that embeds the yarn is used to bind the yarn to the resin. It is necessary to embed it in the inside etc., and it becomes a factor which increases the material cost of adhesive tape.

On the other hand, if the bonding strength between the base fabric and the laminate layer is lowered, the fixing force at the intersection of the warp and weft yarns constituting the base fabric is also lowered, so that the straightness of cutting is impaired during hand cutting, or the laminate layer is peeled off from the base fabric, resulting in hand cutting. The problem arises that sexuality is impaired.

In addition, the adhesive tape requires a certain stiffness or elasticity (Anti-drape stiffness) when attaching or peeling, but in order to reduce the manufacturing cost, if the number of layers of the adhesive tape is reduced or the laminate layer is thinned, The problem that the rigidity and elasticity of an adhesive tape loses, and the handleability of an adhesive tape falls will arise.

In order to solve these subjects, in this invention, the adhesive tape of the following aspect is provided.

(A) An adhesive tape comprising a base fabric, a laminate layer disposed on one side of the base fabric, and an adhesive layer disposed on the other side of the base fabric, wherein the base fabric of the adhesive tape is a woven fabric composed of warp and weft yarns, or It is a knitted fabric, the laminate layer is composed of a thermoplastic resin containing polyethylene, the adhesive layer is composed of a rubber-based adhesive mainly composed of natural rubber or synthetic rubber, and the warp yarn is a polyester woolen processed yarn. Adhesive tape.

(B) An adhesive tape comprising a base fabric, a laminate layer disposed on one side of the base fabric, and an adhesive layer disposed on the other side of the base fabric, wherein the base fabric is a woven or knitted fabric composed of warp and weft yarns, 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, and the laminate layer is composed of low-density polyethylene, ethylene-vinyl acetate copolymer or ethylene-ethyl acrylate copolymer. An adhesive tape comprising: a first laminate layer containing; a second laminate layer containing low-density polyethylene and high-density polyethylene;

In the adhesive tape according to one aspect of the present invention, the total thickness is reduced by combining a laminate layer composed of a polyethylene-containing thermoplastic resin and a pressure-sensitive adhesive layer composed of a rubber-based adhesive, using a base fabric made of polyester woolly processed yarn as a warp. It is thin, suppresses peeling of the laminate layer and residual pressure-sensitive adhesive, and has excellent hand-cutting properties, so that it is easy to manufacture and cost reduction is possible by reducing the amount of material used.

Further, in the adhesive tape according to another aspect of the present invention, the bonding strength between the base fabric and the laminate layer is improved by making the first laminate layer a mixture of low density polyethylene and an ethylene-vinyl acetate copolymer or an ethylene-ethyl acrylate copolymer. Separation of the laminate layer can be suppressed. In addition, by strongly bonding the laminate layer to the base fabric, the intersection of the warp yarn and the weft yarn of the base fabric is 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, a first laminate layer made of a resin containing low-density polyethylene having a low melting temperature as a main component is laminated on the base fabric side, so that the laminate layer penetrates between the fibers of the base fabric, thereby forming a barrier between the laminate layer and the base fabric. adhesion can be improved.

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

In the case of laminating polyethylene to the base fabric, it is advantageous in terms of productivity to use low density polyethylene having a low melting temperature and high malleability. However, the adhesive tape is required to have certain rigidity and elasticity, and the stiffness and elasticity are not obtained when the laminate layer is composed only of low-density polyethylene or when the same mixed resin as the first laminate layer is used. Then, in this invention, rigidity and elasticity are given to an adhesive tape by adding high-density polyethylene to the 2nd laminate layer.

In addition, only high-density polyethylene has a high melting temperature, and bonding strength with the first laminate layer is reduced. Therefore, the adhesive tape of the present invention has a first laminate layer containing low density polyethylene as a main component and adding an ethylene-vinyl acetate copolymer or an ethylene-ethyl acrylate copolymer, and a first laminate layer containing high density polyethylene as a main component and adding low density polyethylene. By laminating the second lamination layer, the bonding strength between the lamination layer and the base fabric is improved, and the adhesive tape is made to have rigidity and elasticity.

1 is a conceptual diagram for comparing false twisted yarn and woolly processed yarn.
2 : is a conceptual diagram when a laminate layer and an adhesive layer are formed in base fabric.
3 is a schematic view showing a cross section of an adhesive tape according to an embodiment of the present invention.
Fig. 4 is a schematic diagram showing a cross section of an adhesive tape according to another embodiment of the present invention.

<bubble>

As the base fabric used for the adhesive tape of the present invention, a woven or knitted fabric composed of warp and weft yarns of long fibers can be used. The weave structure of the woven fabric can be selected from plain weave, twill weave, satin weave, etc. according to various target characteristics such as cutting direction and strength. In addition, the knitted fabric used for the adhesive tape of the present invention is a fabric having a structure in which one of the warp yarn and the weft yarn forms a continuous loop and the other yarn is inserted through this loop. Which of the warp and weft yarns to form loops can be determined based on the cutting direction of the target adhesive tape by hand cutting, and the direction perpendicular to the yarn forming the loops can be used as the hand cutting direction. In addition, warp yarns described below are yarns whose stretching direction is substantially parallel to the lengthwise direction of the adhesive tape, and weft yarns are yarns whose stretching direction is disposed substantially perpendicular to the lengthwise direction of the adhesive tape.

(slope)

Polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytributylene terephthalate (PTT), polyethylene naphthalate (PEN), polylactic acid (PLA), etc. Esters are used, and among these, PET having a general purpose is particularly preferable. Since the polyester fiber used for the warp yarn has a higher melting point than the polyethylene resin constituting the lamination layer, it is possible to prevent melting or shrinkage of the yarn when laminating the base fabric. In addition, since polyester fiber has a lower yarn elongation than other synthetic fibers such as polypropylene (PP) and nylon (Ny), when cutting the adhesive tape by hand in the width direction, warp elongation is suppressed to reduce the length of the cut surface. It is possible to suppress the generation of fluff and unraveling.

For the warp yarn, normal twisted yarn or woolly processed yarn can be used. Woolly processed yarn is a filament yarn composed of thermoplastic long fibers that is twisted, heat-set, and then untwisted. Compared to false-twist yarns, each single yarn has crimping properties, so there is little contact between single yarns. Therefore, at the time of hand cutting, frictional resistance between single yarns is not applied, and the adhesive tape can be cut by hand with weak force. In one aspect of the present invention, a woolly processed yarn made of polyester is used as the warp yarn of the base fabric.

(weft)

The weft used for the base fabric of the adhesive tape is not particularly limited as long as it does not affect the formation of the laminate layer and the adhesive layer, and fibers generally used for the base fabric of the adhesive tape can be used. You may use woolly processed yarn made of polyester. This makes it possible to increase the bonding area between the single yarn of the base fabric and the laminate layer and the pressure-sensitive adhesive layer more than in the case of using only the warp yarn as woolly processed yarn, and it is possible to suppress the pressure-sensitive adhesive remaining and the peeling of the laminate layer. In addition, the thickness of the base fabric can be further reduced than in the case where only the warp yarn is used as woolly finished yarn, and the amount of laminate resin or adhesive for embedding the base fabric can be reduced. Further, when hand cutting property is required also in the longitudinal direction of the adhesive tape, hand cutting property is improved because the cutting strength of the weft yarn is lowered.

For the weft used for the base fabric of the adhesive tape, a false twisted yarn made of polyethylene may be used. By making the weft yarn the same material as the laminate layer, the bonding force between the laminate layer and the base fabric increases, and peeling of the laminate layer can be further suppressed.

A flat yarn made of polyethylene may be used for the weft yarn used for the base fabric of the adhesive tape. By making the weft yarn the same material as the laminate layer, the bonding force between the laminate layer and the base fabric increases, and peeling of the laminate layer can be further suppressed. In addition, by using the weft yarn as a flat yarn, the bonding area between the laminate layer and the pressure-sensitive adhesive layer and base fabric is increased, and peeling of the laminate layer and the remaining pressure-sensitive adhesive can be further suppressed.

The difference between the case of using the conventional false-twist yarn and the woolly processed yarn used in the present invention for the warp yarn is explained using a conceptual diagram of a cross section in the fiber direction shown in FIG. 1.

As shown in Fig. 1(a), the false-twist yarn 2 has a large dimension a, which is the thickness of the false-twist yarn 2, in that single yarns 1 are densely formed by false twist processing to form one yarn. In contrast, since the woolly finished yarn 3 is untwisted, when forming a laminate layer or an adhesive layer for the base fabric described later, as shown in FIG. 1(b), the yarn is flattened, and the woolly finished yarn ), the thickness a' dimension becomes smaller than the a dimension.

When warp yarns and weft yarns of base fabric are exposed on the surface of the pressure-sensitive adhesive, the area of the pressure-sensitive adhesive on the pressure-sensitive adhesive surface of the pressure-sensitive adhesive tape decreases, and thus the adhesive strength of the pressure-sensitive adhesive tape decreases. In addition, if warp or weft yarns of air bubbles appear on the surface of the laminate layer, irregularities are generated on the surface of the laminate layer, resulting in poor appearance when the adhesive tape is attached to the adherend, and problems such as stains adhering to the uneven portions. occurs. In addition, when warp yarns or weft yarns of air fabric are exposed on the surface of the adhesive or laminate layer, when the exposed yarn absorbs or absorbs moisture due to atmospheric conditions during storage or use of the adhesive tape, moisture may pass between the laminate layer and the air fabric or between the adhesive layer and the adhesive layer. It penetrates between the air bubbles, and the bonding force between the laminate layer or the pressure-sensitive adhesive layer and the air bubbles is reduced.

In order to prevent these problems, it is necessary to embed air bubbles in the laminate layer and the pressure-sensitive adhesive layer, and to prevent air bubbles from appearing on the surfaces of the laminate layer and the pressure-sensitive adhesive layer. In that case, the amount of resin and adhesive used for embedding the woolly processed yarn is smaller than that of the false-twist yarn, and the thickness b' of the laminate layer 4 when the woolly processed yarn 3 shown in Fig. 2 (b) is used The sum of the thickness c' of the pressure-sensitive adhesive layer 5 is greater than the sum of the thickness b of the laminate layer 4 and the thickness c of the pressure-sensitive adhesive layer 5 in the case of using the false-twist yarn 2 shown in Fig. 2(a). it gets smaller Therefore, the amount of resin required for formation of the laminate layer 4 and the amount of adhesive required for formation of the pressure-sensitive adhesive layer 5 are reduced, and material cost can be reduced compared to the case where false-twist yarn is used.

Further, in addition to improving the hand-cutting property by using the woolly processed yarn for the warp yarn, by making the laminate layer and the pressure-sensitive adhesive layer thin, the cutting strength at the time of cutting the laminate layer or the pressure-sensitive adhesive layer can be reduced, and the hand-cutting property can be reduced. more improved

As the weft yarn, twisted yarn, woolly processed yarn, flat yarn, or the like can be selected according to the performance required of the adhesive tape.

When false-twist yarn is used for the weft yarn, since the difference in strength from the warp yarn, which is woolly processed yarn, is large, it is easier to hand-cut the adhesive tape in the width direction than in the length direction, and when hand-cutting the adhesive tape in the width direction straightness is improved.

When woolly processed yarn is used for the weft yarn, the thickness of the base fabric becomes thinner compared to the case where woolly processed yarn is used only for the warp yarn, and the amount of resin or adhesive used in the laminate layer is further reduced, so that the adhesive tape can be made thin. . Further, when hand cutting property is required also in the longitudinal direction of the adhesive tape, by using a woolly processed yarn for the weft yarn, the breaking strength in the longitudinal direction is lowered and the hand cutting property is improved.

In addition, by using the woolly processed yarn for the weft yarn, the bonding area between the base fabric and the laminate layer and the pressure-sensitive adhesive layer increases, and the effect of effectively suppressing the adhesive remaining or the peeling of the laminate layer is also obtained.

When flat yarn is used for the weft yarn, the difference in breaking strength from the woolly processed yarn increases, and the straightness when hand-cutting in the width direction is improved. In addition, by using the flat yarn, the bonding area between the weft yarn and the laminate layer and the pressure-sensitive adhesive layer is increased, and the effect of effectively suppressing the remaining pressure of the pressure-sensitive adhesive and peeling of the laminate layer is also obtained.

The material of the weft yarn is polyester such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), polyolefin such as polyethylene (PE) and polypropylene (PP), and poly such as 6 nylon and 6,6 nylon. Regenerated fibers such as amide, rayon, and cupra, and vegetable fibers such as cotton and hemp can be used. Moreover, you may use the fiber which mixed the fiber of these materials.

Among these materials, when the same polyethylene as the laminate layer is used, the bonding force between the base fabric and the laminate layer increases, and peeling of the laminate layer can be further suppressed. Further, by using polyethylene fibers, the cutting property in the longitudinal direction of the adhesive tape can be improved, thereby improving processing stability during lamination processing.

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

The fineness of the single yarn constituting the warp yarn 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. A polyester fiber having a single yarn fineness of 0.3 denier or more has sufficient breaking strength even when used as a woolly finished yarn, and can suppress a decrease in workability when laminated to base fabric. In addition, when the single yarn fineness 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 yarns 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 of the base fabric in the longitudinal direction does not decrease, and processing at the time of forming a laminate layer on the base fabric becomes easy. In addition, when the yarn density is 180 or less, the number of warp yarns is too large, so no force is required at the time of hand cutting, and the increase in manufacturing cost can be suppressed.

The fineness of the fibers used for the weft yarn is preferably 30 denier or more and 250 denier or less, more preferably 50 denier or more and 200 denier or less, when draw-twisted yarn or woolly processed yarn is used. 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. In the case of 250 denier or less, the occurrence of irregularities on the surface of the pressure-sensitive adhesive layer and deterioration in adhesive performance can be suppressed, and the increase in manufacturing cost due to an increase in the amount of adhesive or resin to embed these irregularities can also be suppressed. When flat yarn is used for the weft yarn, it is preferable that the fineness is 50 denier or more and 500 denier or less. In the case of 50 denier or more, the flat yarn does not become too thin, and thermal deterioration of the yarn during lamination can be suppressed, and in the case of 500 denier or less, the flat yarn does not become too thick, and is used for a laminate layer or an adhesive layer. 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 adhesive used.

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

In order to increase bonding strength with the laminate layer or the pressure-sensitive adhesive layer, physical or chemical anchoring treatment may be performed on these formation surfaces of the cells. 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 organotitanium-based, isocyanate-based, polyethyleneimine-based, polybutadiene-based, and the like.

<Laminate layer>

The laminate layer in the adhesive tape of the present invention is constituted by a thermoplastic resin containing polyethylene.

Polyethylene has a melting point of 100 to 150°C, which is low compared to other general-purpose thermoplastic resins such as polypropylene, polyethylene terephthalate, and nylon. Therefore, the melting temperature of the resin at the time of forming the laminate layer in the base fabric is low, and the manufacturing cost can be suppressed.

As polyethylene, low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), high-density polyethylene (HDPE), etc. can be used, and several types of these can also be mixed and used. By selecting low-density polyethylene, adhesion to the base fabric can be improved, and by selecting high-density polyethylene, a certain hardness can be imparted to the laminate layer to improve the handleability of the adhesive tape. It is possible to express various required characteristics.

In the present invention, low-density polyethylene is polyethylene having a density of more than 0.911 g/cm 3 and less than or equal to 0.925 g/cm 3 , and high-density polyethylene means polyethylene having a density of more than 0.940 g/cm 3 . In addition, medium-density polyethylene having a density greater than 0.925 g/cm 3 and less than or equal to 0.940 g/cm 3 may be used as a part of high-density polyethylene.

By adding an ethylene-vinyl acetate copolymer (EVA), an ethylene-ethyl acrylate copolymer (EEA), or the like to the polyethylene resin used for the laminate layer, bondability with cells can be further improved.

Specifically, the laminate layer of the adhesive tape according to one aspect of the present invention has a first laminate layer in which a mixture obtained by adding EVA or EEA to LDPE as a main component is disposed on the base fabric side, and HDPE as a main component. , and a second laminate layer obtained by laminating a mixture obtained by adding LDPE thereto on the first laminate layer. With this configuration, the bonding force between the base fabric and the laminate layer can be improved, and the adhesive tape can have the necessary rigidity and elasticity when attaching or peeling.

The amount A of LDPE in the first laminate layer is preferably 60 to 95 parts by mass, more preferably 70 to 90 parts by mass. Also, the amount B of EVA or EEA is preferably 5 to 40 parts by mass, more preferably 10 to 30 parts by mass. In addition, the sum of quantity A and quantity B is 100 mass parts. When the amount B is 5 parts by mass or more, sufficient bonding strength between the laminate layer and the base fabric required for the adhesive tape is obtained. Moreover, although the bond strength between the base fabric and the first laminate 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 also increases along with the increase of the amount B. When the amount of B is 40 parts by mass or less, an increase in manufacturing cost can be suppressed, and the mixing ratio can be obtained to obtain bonding strength between the lamination layer and the base fabric required for the adhesive tape.

The amount of resin in the first laminate layer may be any amount capable of securing the adhesive strength 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 2 can do more What is necessary is just to determine the upper limit of the amount of resin according to the function requested|required of an adhesive tape. In addition, when the amount of resin decreases, the heat capacity of the first laminate layer is small, and the temperature of the resin decreases due to contact with air bubbles, so that sufficient bonding strength between the first laminate layer and air bubbles may not be obtained. When the amount of resin is excessively large, the production rate is lowered and the productivity is affected because time is required for curing the resin. If it is 35 g/m<2> or less, the fall of productivity can be suppressed.

The amount C of HDPE in the second laminate layer is preferably 55 to 90 parts by mass, more preferably 60 to 80 parts by mass. The amount D of LDPE is preferably from 10 to 45 parts by mass, more preferably from 20 to 40 parts by mass. In addition, the sum of the amount C and the amount D is 100 parts by mass.

When the amount of C is 55 parts by mass or more, the rigidity and elasticity required for the adhesive tape are sufficiently obtained. Moreover, when the quantity D is 10 parts by mass or more, the fluidity of the mixed resin can be ensured, and a decrease in the workability of the lamination process can be suppressed. In addition, in the above composition ratio, it is possible to suppress the occurrence of peeling between layers due to a decrease in bonding strength with the first laminate layer.

The amount of resin in the second laminate layer can be determined depending on the rigidity 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. What is necessary is just to determine the upper limit of the amount of resin according to the function requested|required of an adhesive tape.

The total amount of resin in the first laminate layer and the second laminate layer is equal to or greater than the sum of the above lower limits, but is preferably 30 g/m 2 or more, more preferably 35 g/m 2 or more, and still more preferably 40 g/m 2 or more. . The upper limit of the total amount of resin may be determined according to the function required of the adhesive tape, but from the viewpoint of hand cutting property, the total amount of resin is preferably 60 g/m 2 or less, and more preferably 50 g/m 2 or less.

<Adhesive layer>

For 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. Rubber-based pressure-sensitive adhesives have lower adherend selectivity compared to acrylic-based pressure-sensitive adhesives and silicone-based pressure-sensitive adhesives, and are strongly bonded to both the base fabric and the laminate layer, so that the remaining pressure of the pressure-sensitive adhesive can be suppressed.

As the natural rubber, sheet rubber formed by coagulating and drying natural rubber latex with an acid and block rubber molded after washing and drying the coagulated small-grained rubber can be used.

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

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

Examples of the synthetic rubber include diene rubbers 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). A synthetic 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, such as the non-diene rubber of the above, 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 adhesive may contain, in addition to the rubber-based adhesive as the main component, a filler for adjusting the adhesive strength, a tackifying resin, and a plasticizer as a softening component of the adhesive. Examples of the filler include heavy calcium carbonate, carbon black, titanium oxide, talc, and cellulose powder, and these may be used alone or in combination of two or more. As the tackifying resin, various tackifying resins such as rosin-based resins, terpene-based resins, hydrocarbon-based resins, and phenol-based resins can be used, and one of these can be used alone or in combination of two or more. . As the plasticizer, phthalic acid-based plasticizers, isophthalic acid-based plasticizers, terephthalic acid-based plasticizers, adipic acid-based plasticizers, polyester-based plasticizers, phosphoric acid-based plasticizers, epoxy-based plasticizers, and the like may be used alone or in combination of two or more.

The pressure-sensitive adhesive may contain various additives known in the field of the present invention in addition to the above fillers and the like. Examples of such additives include flame retardants, pigments, anti-aging agents, lubricants, and the like, and these additives may be contained singly or in combination of two or more.

＜Others＞

A backside treatment layer can be formed by applying a release agent to the back side opposite to the base fabric side of the laminate layer. By forming the back surface treatment layer, when the adhesive tape is wound, the adhesive remaining on the surface of the laminate layer and the laminate layer peeling in which the laminate layer is peeled from air bubbles can be prevented. As the release agent, a long chain alkyl release agent (a copolymer of stearyl acrylate and acrylic acid, vinyl acetate or acrylonitrile, a copolymer of stearyl acrylamide and acrylonitrile or acrylic acid, stearyl vinyl ether and acrylic acid, maleic anhydride acids, copolymers of acrylonitrile, etc.), silicone type release agents such as addition reaction type, condensation reaction type, cationic polymerization type, and radical polymerization type.

<Manufacturing method>

The manufacturing method of an adhesive tape is not specifically limited, It can manufacture using a well-known manufacturing method. For example, after weaving or knitting a base fabric, a resin containing polyethylene is laminated on one side thereof. Laminate processing methods include a method of thermally melting a polyethylene-containing resin and extruding the base fabric, or overlapping a polyethylene-containing resin film on the base fabric and thermally compressing the laminate. In addition, a physical or chemical anchoring treatment may be performed on the surface of the base fabric on which the laminate layer is formed in order to improve the adhesion between the base fabric and the laminate 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 organotitanium-based, isocyanate-based, polyethyleneimine-based, polybutadiene-based, and the like.

Specifically, in the laminate layer of the adhesive tape according to one embodiment of the present invention, first, a mixture containing LDPE as a main component and adding EVA or EEA to it is hot-melted, and then applied to the surface of the base fabric by extrusion molding or the like. 1 Laminate layer is formed. Next, after hot-melting a mixture containing HDPE as a main component and adding LDPE thereto, a second laminate layer is formed on the back side of the first laminate layer by extrusion molding or the like.

Next, the separately mixed and prepared adhesive composition is applied to the surface of the base fabric on the opposite side to the laminate layer to form an adhesive layer. A physical or chemical anchoring treatment may be performed on the surface of the base fabric on which the pressure-sensitive adhesive layer is formed in order to improve the adhesion between the base fabric 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 organotitanium-based, isocyanate-based, polyethyleneimine-based, polybutadiene-based, and the like.

The pressure-sensitive adhesive layer can be formed using various coating devices. Examples of the coating device include a calendering machine, a roll coater, a die coater, a lip coater, a Meyer bar coater, and a gravure coater.

The structure of the adhesive tape 10 of one embodiment of this invention manufactured by the method mentioned above is demonstrated using FIGS. 3(a)-(c). These schematically show a cross section in the weft yarn orientation direction (weft yarn cross section), and the warp yarn 6 (woolly processed yarn 3) is shown in a simplified manner. In FIG. 3(a), a configuration using false-twist yarn 7 as a weft yarn, a configuration using woolly processed yarn 8 as a weft yarn in FIG. 3(b), and a flat yarn 9 as a weft yarn in FIG. 3(c) The configuration used is described. In this configuration, the woolly processed yarn 3 is used as the warp yarn 6 and the false twisted yarn 7, the woolly processed yarn 8 or the flat yarn 9 is used as the weft yarn, and these are plain weaved to form a base fabric. A laminate layer (4) is formed on one side of the base fabric, an adhesive layer (5) is formed on the other side, and a release agent is applied to the back side (10B) of the laminate layer to form a back surface treatment layer (11). there is.

Fig. 4 schematically shows a cross section (oblique cross section) of an adhesive tape 20 using two laminate layers as a laminate layer, which is another embodiment of the present invention, in an oblique alignment direction.

This adhesive tape 20 includes a base fabric 14 composed of warp yarns 12 and weft yarns 13, a laminate layer 15 disposed on one side of the base fabric 14, and the other side of the base fabric 14. It is composed of an adhesive layer 16 disposed on the surface of. The laminate layer 15 is constituted by a first laminate layer 17 made of a mixture of LDPE and EVA or EEA, and a second laminate layer 18 made of a mixture of HDPE and LDPE. In addition, in the structure shown in FIG. 4, the example in which the backside treatment layer 19 was formed on the surface of the 2nd laminate layer which is the backside 20B of the adhesive tape 20 is described.

In addition, after the manufactured adhesive tape is wound into a roll shape and cut to a predetermined width, the side surface is protected with a packaging material, for example, a polyethylene film, or stored in an individual packaging of the polyethylene film, so that the side surface of the adhesive tape is different. Boxes can be packed in a state where contact with adhesive tape or packing material is prevented.

Example

Hereinafter, the present invention will be described in detail with reference to examples. However, the present invention is not limited only to these examples. In addition, for the physical property values of each raw material, published values such as manufacturer's catalog values are described.

The resin materials used in Examples and Comparative Examples are as follows.

LDPE: Trade name "NUC8000", manufactured by Nippon Unika Co., Ltd.

HDPE: Trade name "NUC8009", manufactured by Nippon Unica Co., Ltd.

EVA: Product name "E181L", manufactured by TOTAL

EEA: Trade name "EA101", manufactured by Dow Chemical

Example A1

Polyethylene terephthalate (PET) woolen yarn with a fineness of 30 denier and 36 filaments is used as the warp yarn, and PET false-twist yarn with a fineness of 100 denier and 48 filaments is used as the weft yarn, and the warp yarn is 78 yarns/inch and 18 weft yarns A plain weave was made into a base fabric at a density of / inch.

Low-density polyethylene was laminated on one surface of the base fabric using an extrusion laminator to form a laminate 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 (as a plasticizer) EMG Lubricant Co., Ltd., trade name "Mobilisum 610") 30 parts by mass, an aliphatic hydrocarbon resin as a tackifying resin (Nippon Zeon Co., Ltd., trade name "Quinton (registered trademark) R100") 100 parts by mass and a Soviet accelerator A total of 1 part by mass of antioxidants was added, and these were mixed and adjusted. This pressure-sensitive adhesive was applied to the surface opposite to the surface on which the laminate layer of the base fabric was formed using a calender coating machine to form an pressure-sensitive adhesive layer to obtain an adhesive tape having a total thickness of 140 µm. The amount of resin used in order to prevent air bubbles from appearing on the surface of the laminate layer was 40 g/m 2 , and the amount of adhesive used to prevent air bubbles from appearing on the surface of the pressure-sensitive adhesive layer was 110 g/m 2 .

Example A2

An adhesive tape having a total thickness of 140 μm was obtained in the same manner as in Example A1, except that a long-chain alkyl release agent (manufactured by Lion Specialty Chemicals, trade name “Pyroyl 1010”) was applied to the back side of the laminate layer. . The amount of resin used to form the laminate 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

A pressure-sensitive adhesive tape having a total thickness of 140 µm was obtained in the same manner as in Example A1 except that the base fabric before forming the laminate layer was subjected to corona treatment. The amount of resin used to form the laminate 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

Corona treatment as an anchor treatment was applied to the base fabric before forming the laminate layer, and a long-chain alkyl release agent (manufactured by Lion Specialty Chemicals, trade name "Pyrroyl 1010") was applied to the back side of the laminate layer. In the same manner as in Example A1, an adhesive tape having a total thickness of 140 µm was obtained. The amount of resin used to form the laminate 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 a number of filaments of 48 was used as the weft yarn. 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-twist yarn made of HDPE having a fineness of 100 denier and the number of filaments of 48 was used as the weft yarn. The amount of resin used to form the laminate 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 with a total thickness of 135 µm was obtained in the same manner as in Example A4, except that a flat yarn made of HDPE having a fineness of 300 denier was used as the weft yarn at a density of 17 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 "Esprene #301") 100 parts by mass, heavy calcium carbonate (manufactured by Maruo Calcium Co., Ltd., average particle diameter 12 μm) 170 parts by mass, naphthenic process oil (manufactured by Nippon Sun Oil Co., Ltd., trade name "SUNTHENE4240") 15 parts by mass, an aliphatic hydrocarbon resin (manufactured by Nippon Zeon Co., Ltd., trade name "Quinton (registered trademark) N180") 30 parts by mass and a total of 2 parts by mass of a Soviet accelerator, a lubricant and an anti-aging agent are added, and these are mixed. An adhesive tape having a total thickness of 135 µm was obtained in the same manner as in Example A5 except that one 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, natural rubber (RSS#3) 70 parts by mass, EPDM (manufactured by Sumitomo Chemical Co., Ltd., trade name "Esprene #301") 30 parts by mass, heavy calcium carbonate (manufactured by Maruo Calcium Co., Ltd., average particle size 12 μm) 170 parts by mass , Naphthenic process oil (manufactured by Nippon Sun Oil Co., Ltd., trade name "SUNTHENE4240") 15 parts by mass, aliphatic hydrocarbon resin (manufactured by Nippon Zeon Co., Ltd., trade name "Quinton (registered trademark) N180") 30 parts by mass and Soviet accelerator, lubricant and aging agent An adhesive tape having a total thickness of 135 μm was obtained in the same manner as in Example A5, except that a total of 2 parts by mass of the inhibitor was added and a mixture of these 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 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 woolly processed yarn made of PET having a fineness of 15 denier and a number of filaments of 12 was used as the warp yarn. The amount of resin used to form the laminate 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 woolly processed yarn made of PET with a fineness of 75 denier and a number of filaments of 48 was used as the warp yarn. The amount of resin used to form the laminate 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 woolly processed yarn made of PET having a fineness of 75 denier and a number of filaments of 24 was used as the warp yarn. The amount of resin used to form the laminate 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 yarn density was 20 yarns/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 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 yarn density was 150 yarns/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

30 denier fineness and 36 filaments as warp yarn made of PET wool, and 100 denier fineness and 48 filament counts as weft yarn made of HDPE false-twist yarn, warp yarn with a density of 78 yarns/inch and weft yarns of 18 yarns/inch. Organized a letter that becomes an independent chain. An adhesive tape having a total thickness of 140 µm was obtained in the same manner as in Example A6, except that this warp knitted fabric was used as a base fabric. The amount of resin used to form the laminate 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

PET yarn with a fineness of 30 denier and 36 filaments is used as the warp yarn, and PET yarn with a fineness of 100 denier and 48 filaments is used as the weft yarn, and the warp yarn is 78/inch and the weft is 18/inch. A plain weave was produced and used as a base fabric. High-density polyethylene was laminated on one side of the base fabric using an extrusion laminator, and further, low-density polyethylene was laminated thereon using an extrusion laminator to form a laminate layer. Next, the same adhesive as in Example A1 was applied to the other side of the base fabric using a calender coater 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 air bubbles from appearing on the surface of the laminate layer was 35 g/m 2 , and the amount of adhesive used to prevent air bubbles from appearing on the surface of the pressure-sensitive adhesive layer was 90 g/m 2 .

Comparative Example A1

When attempting to laminate PET resin using the extrusion laminator used in Example A1 using the base fabric subjected to the same anchoring treatment as in Example A4, the malleability of the molten resin was poor and it took time to form the laminate layer. Because of this, the trial was stopped.

Comparative Example A2

When attempting to laminate PP resin using the extrusion laminator used in Example A1 using the base fabric subjected to the same anchoring treatment as in Example A4, the malleability of the molten resin was poor and the formation of the laminate layer took time. Because of this, the start was stopped.

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 twisted yarn made of PET with a fineness of 30 denier and a number of filaments of 36 was used as the warp yarn. The amount of resin used to form the laminate 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 twisted yarn made of PET having a fineness of 15 denier and a number of filaments of 12 was used as the warp yarn. 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 a number of filaments of 12 was used as the warp yarn. The amount of resin used to form the laminate 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

Layer thickness 125 in the same manner as in Example A5, except that 0.2 g of curing agent (Soken Chemical, L45) was added per 100 g of acrylic adhesive (Soken Chemical, SK Dyne 702L), and the adhesive whose viscosity was adjusted with ethyl acetate was used. An adhesive tape of μm was obtained. The amount of resin used to form the laminate 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

An adhesive tape having a total thickness of 160 μm was obtained in the same manner as in Example A4, except that a PET wool processed yarn having a fineness of 100 denier and a number of filaments of 96 was used as the warp yarn and the warp yarn density 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

An adhesive tape having a total thickness of 170 μm was obtained in the same manner as in Example A4, except that a PET wool processed yarn having a fineness of 100 denier and a number of filaments of 24 was used as the warp yarn and the warp yarn density was 60 yarns/inch. The amount of resin used to form the laminate 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

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 36 denier and a number of filaments of 36 was used as the warp yarn and the warp yarn density was 15 yarns/inch. The amount of resin used to form the laminate 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

An adhesive tape with a total thickness of 160 μm was obtained in the same manner as in Example A4, except that a PET woolly processed yarn having a fineness of 15 denier and a number of filaments of 12 was used as the warp yarn and the warp yarn density was 190 yarns/inch. The amount of resin used to form the laminate 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 in Examples A1 to A16, Comparative Examples A1 to A6, and Reference Examples A1 to A5 were evaluated by the following methods. A result is shown in Table 1 - Table 4.

[Production of evaluation samples]

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 winding products having a winding amount of 25 m, and then cut into 50 mm width to serve as samples for evaluation. did

[thickness]

The total thickness of the adhesive tape was measured based on the thickness measurement method stipulated by JIS Z 0237:2009.

[Adhesive remaining]

A sample for measurement was produced according to the method for measuring the adhesive force of JIS Z 0237:2009. After storing this sample for 72 hours in an atmosphere at a temperature of 23 ± 1 ° C. and a relative humidity of 50 ± 5%, the adhesive tape was peeled from the test plate by the same method as the method for measuring the 180 ° peel adhesive force to the test plate. The test plate after peeling was visually observed, the number of test pieces to which the adhesive was adhered was counted, and evaluation was performed based on the following criteria.

○○○ Residual adhesive does not occur

○○ Less than 3% adhesive residue occurrence rate

○ Less than 5% adhesive residue occurrence rate

△ Less than 10% adhesive residue occurrence rate

× 10% or more of adhesive residue occurrence rate

[Laminate layer peeling]

After storing the rolled evaluation sample in an atmosphere of a temperature of 65°C and a relative humidity of 80% for 24 hours, it was peeled off for 1 m by hand. The adhesive tape after peeling was visually observed, the number of test pieces in which the laminate layer of the adhesive tape was peeled from the base material was counted, and evaluation was performed based on the following criteria.

○○○ No peeling of the laminate layer

○○ Less than 3% rate of peeling of laminate layer

○ Less than 5% of laminate layer separation rate

△ Less than 10% of the rate of peeling of the laminate layer

× 10% or more of the rate of peeling of the laminate layer

[hand cutability]

The 50 mm width x 25 m wound adhesive tape was cut by hand every 1 m, and among the fluff generated at the cut portion, the number of cut portions having fluff exceeding 2 mm in length was counted. The cleavage score was 100 points for each sample.

○○○ No fluffing

○○ Lint generation rate less than 5%

○ Less than 10% lint occurrence rate

△ Less than 20% lint generation rate

× 20% or higher incidence of fluffing

[Tear force]

A sample for measurement 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 tear strength in JIS Z 0237:2009.

Example B1

Polyethylene terephthalate (PET) woolen yarn with a fineness of 30 denier and 36 filaments is used as the warp yarn, and PET false-twist yarn with a fineness of 100 denier and 48 filaments is used as the weft yarn, and the warp yarn is 78 yarns/inch and 18 weft yarns A plain weave was made into a base fabric at a density of / inch.

After corona treatment of one side of this base fabric, a mixed resin of 80 parts by mass of LDPE and 20 parts by mass of EVA (hereinafter described as a composition ratio of 80: 20) is applied to the corona treated surface using an extrusion laminator, and the resin amount is 27 g /m 2 to form a first laminate layer. Then, using an extrusion laminator, a mixed resin of HDPE:LDPE = 70:30 (composition ratio) was laminated on the surface of the first laminate layer in a resin amount of 13 g/m 2 to form a second laminate layer, A long-chain alkyl-based release agent (manufactured by Lion Specialty Chemicals, trade name "Pyrroyl 1010") was applied to the surface to form a backside treatment layer. The adhesive was formulated with 100 parts by mass of Soviet natural rubber (RSS#3), 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 (manufactured by EMG Lubricant Co., Ltd., as a plasticizer). 30 parts by mass of a product name "Mobilisum 610"), 100 parts by mass of an aliphatic hydrocarbon resin (manufactured by Nippon Zeon Co., Ltd., trade name "Quinton (registered trademark) R100") as a tackifying resin, and 1 part by mass of a Soviet accelerator and anti-aging agent in total It was added, and these were mixed and prepared. This pressure-sensitive adhesive was applied to the surface on the opposite side of the surface on which the lamination layer of the base fabric was formed using a calender coating machine to form an pressure-sensitive adhesive layer to prepare an adhesive tape having a total thickness of 140 µm.

Example B2

An adhesive tape having a total thickness of 140 μm was prepared in the same manner as in Example B1, except that EVA of the first laminate layer was changed to 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 laminate 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 laminate 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 laminate 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 laminate 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 laminate layer was 20 g/m 2 and the amount of resin in the second laminate 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 laminate layer was 10 g/m 2 and the amount of resin in the second laminate 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 laminate layer was 30 g/m 2 and the amount of resin in the second laminate 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 laminate layer was 33 g/m 2 and the amount of resin in the second laminate layer was 7 g/m 2 .

Example B11

In the same manner as in Example 2, except that the amount of resin in the first laminate layer was 24 g/m 2 , the amount of resin in the second laminate layer was 11 g/m 2 and the total amount of resin in the laminate layer was 35 g/m 2 , an adhesive tape having a total thickness of 135 μm was produced.

Example B12

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

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 laminate layer was 5 g/m 2 and the amount of resin in the second laminate 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 laminate layer was 35 g/m 2 and the amount of resin in the second laminate 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 laminate layer was 20 g/m 2 and the amount of resin in the second laminate layer was 10 g/m 2 .

Comparative Example B1

Polyethylene terephthalate (PET) woolen yarn with a fineness of 30 denier and 36 filaments is used as the warp yarn, and PET false-twist yarn with a fineness of 100 denier and 48 filaments is used as the weft yarn, and the warp yarn is 78 yarns/inch and 18 weft yarns A plain weave was made into a base fabric at a density of / inch. After corona-treating one surface of this base fabric, LDPE was laminated|stacked by 40 g/m<2> of resin amounts on the corona-treated surface using the extrusion laminator, and the lamination layer was formed. Thereafter, a long-chain alkyl release agent (manufactured by Lion Specialty Chemicals, trade name "Pyrroyl 1010") was applied to the surface of the laminate layer to form a back surface treatment layer. The adhesive is 100 parts by mass of natural rubber (RSS # 3) kneaded by 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 Lubricant) as a plasticizer company, trade name "Mobilisum 610") 30 parts by mass, an aliphatic hydrocarbon resin as a tackifying resin (manufactured by Nippon Zeon, trade name "Quinton (registered trademark) R100") 100 parts by mass and a total of a Soviet accelerator and anti-aging agent 1 part by mass was added, and these were mixed and adjusted. This pressure-sensitive adhesive was applied to the surface on the opposite side of the surface on which the lamination layer of the base fabric was formed using a calender coating machine to form an pressure-sensitive adhesive layer to prepare an adhesive tape having a total thickness of 135 µm.

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 HDPE was used as LDPE used for the laminate layer.

Comparative Example B3

After laminating LDPE at a resin amount of 27 g / m 2 on the corona treatment surface of the base fabric, and then further laminating LDPE at a resin amount of 13 g / m 2, except that a laminate layer was formed, in the same manner as in Comparative Example B1, total An adhesive tape having a thickness of 140 µm was produced.

Comparative Example B4

After laminating LDPE with a resin amount of 27 g / m 2 on the corona treatment surface of the base fabric, and then further laminating HDPE with a resin amount of 13 g / m 2 to form a laminate layer, in the same manner as in Comparative Example B1, total An adhesive tape having a thickness of 140 µm was produced.

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 laminate 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 laminate layer was made of 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. A result is shown in Table 5 - Table 7.

[Laminate Layer Adhesion]

A test piece having a width of 25 mm x 200 mm is taken from the adhesive tape base material laminated to the base fabric. The base fabric and the laminate layer of the test piece are peeled about 75 mm from the end, and the base fabric side is gripped by about 25 mm on the upper chuck of a tensile tester (JIS B 7721). It was stretched at a gripping interval of 100 mm and a tensile speed of 300 ± 30 mm/min, and the weight at which the laminate layer was peeled off from the base fabric was measured.

[Rewind test]

The roll-shaped adhesive tape was heated and accelerated at 70°C for 24 hours, and the tape was quickly unwound by hand to a length of about 1 m at high speed to check whether or not the laminate layer of the tape backing agent was peeling off.

[Lecture]

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

[Tear strength]

A sample for measurement was taken from the adhesive tape and measured according to the method for measuring tear strength in JIS Z 0237:2009.

[hand cutability]

A 50 mm width × 25 m wound adhesive tape was cut by hand every 1 m, and among the fluff generated at the cut portion, the number of cut portions having fluff exceeding 2 mm in length was counted. The cleavage score was 100 points for each sample.

○: Less than 5% of occurrence rate of fluffing

△: 5% or more and less than 10% fluff generation

×: 10% or more of the occurrence rate of fluffing or hand-cutting is not possible

In Comparative Examples B1 to B4 and B6 in which EVA or EEA was not used for the laminate layer, peeling of the base fabric and the laminate layer occurred at the time of hand cutting because the adhesive strength between the base fabric and the laminate layer was weak, and the adhesive tape was stretched in the width direction. Hand cutting was not possible (in Table 7, the evaluation of "hand cutting ability" is "x"). In contrast, in Examples B1 to B15 in which EVA or EEA was used for the laminate layer, hand cutting could be performed, and there was little fluffing at the cut portion. Further, in Comparative Example B5, there was no problem in the hand-cutability of the adhesive tape, but peeling between the layers occurred between the first laminate layer and the second laminate layer in the rewinding test.

In addition, in Comparative Examples B1 to B4 and B6, no fracture occurred in the sample in the measurement of tear strength, and the tear strength could not be measured. However, in Examples B1 to B15, the breaking strength could be measured, and the The measured values were also relatively small.

In addition, in the examples in which EVA or EEA was used for the first laminate layer, the laminate layer adhesive strength was higher than that of Comparative Examples B1 to B4 and B6, and the base fabric and the laminate layer were firmly bonded even when the laminate layer was not disposed on both sides of the base fabric. it can be seen that it has been

1: single yarn
2 : twisted yarn
3: wool processing yarn
4: laminate layer
5: adhesive layer
6 : slope
7 : twisted yarn
8: wool processing yarn
9: flat yarn
10, 20: adhesive tape
10B, 20B: rear side
11, 19: back surface treatment layer
12: slope
13: weft
14: bubble
15: laminate layer
17: first laminate layer
18: second laminate layer

Claims (9)

with bubbles,
A laminate layer disposed on one surface of the base fabric;
An adhesive tape comprising an adhesive layer disposed on the other side of the base fabric,
The base fabric is a woven or knitted fabric composed of warp and weft yarns,
The laminate layer is made of a thermoplastic resin containing polyethylene,
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 yarn is a woolly processed yarn made of polyester, an adhesive tape. According to claim 1,
The adhesive tape wherein the weft yarn is a woolly processed yarn made of polyester. According to claim 1,
The adhesive tape wherein the weft yarn is a false-twist yarn made of polyethylene. According to claim 1,
The adhesive tape wherein the weft yarn is a flat yarn made of polyethylene. A base fabric composed of warp and weft yarns;
A laminate layer disposed on one surface of the base fabric;
An adhesive tape comprising an adhesive layer disposed on the other side of the base fabric,
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 laminate layer has a first laminate layer and a second laminate layer from the base fabric side,
The first laminate layer includes low-density polyethylene and an ethylene-vinyl acetate copolymer or an ethylene-ethyl acrylate copolymer,
The pressure-sensitive adhesive tape wherein the second laminate layer contains low density polyethylene and high density polyethylene. According to claim 5,
In the first laminate 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 ethylene-ethyl acrylate copolymer is 5 to 40 parts by mass (provided that the amount A and The total amount of B is 100 parts by mass), the adhesive tape. According to claim 5 or 6,
In the second laminate 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 (provided that the sum of the amounts C and D is 100 parts by mass), adhesive tape. According to any one of claims 5 to 7,
The adhesive tape whose resin amount of the said 1st laminate layer is 10 g/m<2> or more and 35 g/m<2> or less, and the total resin amount of the said laminate layer is 30 g/m<2> or more. According to any one of claims 5 to 7,
The adhesive tape whose resin amount of the said 2nd laminate layer is 10 g/m<2> or more and 35 g/m<2> or less, and the total resin amount of the said laminate layer is 30 g/m<2> or more.

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