JP2011157455A - Cloth adhesive tape and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cloth adhesive tape having a foamed adhesive layer having many closed cells homogeneously dispersed in the hot-melt type adhesive layer and formed by the volatilization of a volatile material, and to provide a method for producing the cloth adhesive tape. <P>SOLUTION: The cloth adhesive tape is produced by forming the hot-melt type adhesive layer on the woven fabric face side of a base material having a layered structure obtained by arranging a synthetic resin layer as a lining material on one surface of the woven fabric. The synthetic resin layer of the lining material, or a second synthetic resin layer formed on the woven fabric face is a synthetic resin layer formed out of a synthetic resin composition containing 30-300 pts.wt. of a porous filler based on 100 pts.wt. of a synthetic resin. The hot-melt type adhesive layer is the foamed adhesive layer containing the many closed cells formed by the volatilization of the volatile material. The method for producing the adhesive tape is also provided. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a cloth pressure-sensitive adhesive tape and a method for producing the same, and more particularly to a cloth pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer containing a large number of closed cells produced by volatilization of a volatile substance such as water and a method for producing the same.

  The cloth adhesive tape is an adhesive tape having a basic layer structure in which an adhesive layer is provided on a support made of woven fabric. Conventionally, various types of cloth adhesive tapes have been manufactured and marketed, but a typical one is polyethylene as a backing material on the back side (the side opposite to the adhesive layer) of a woven fabric support. It has a layer structure in which a synthetic resin layer such as is used as a base material and a hot melt pressure-sensitive adhesive layer is coated on the woven fabric surface. A release agent is generally applied to the back surface (the surface opposite to the woven fabric) of the synthetic resin layer, and when this cloth adhesive tape is rewound and used by this release agent layer, it is used. In addition, the pressure-sensitive adhesive layer strongly adheres to the back surface of the synthetic resin layer and prevents rewinding from becoming difficult.

  Since cloth adhesive tape is excellent in strength, heat resistance, adhesiveness at room temperature, and other properties, it is widely used as an adhesive tape for packaging such as sealing, packaging, and holding. In addition, the cloth adhesive tape is used as various industrial adhesive tapes.

  As a pressure-sensitive adhesive for cloth pressure-sensitive adhesive tape, a rubber-based hot melt pressure-sensitive adhesive is generally used. A rubber-based hot-melt adhesive is an adhesive containing a thermoplastic elastomer such as styrene-isoprene-styrene block copolymer (SIS) or other rubber as a rubber base, and therefore an adhesive layer of a cloth adhesive tape. However, it becomes hard under low-temperature conditions, and in addition to lowering the initial adhesive strength, the adhesiveness to rough surfaces such as corrugated paper is lowered. On the other hand, under normal temperature or higher temperature conditions, the adhesive force of the pressure-sensitive adhesive layer tends to be high, and if it is peeled off when it is stuck, the adherend surface may be damaged, Deform the adherend.

  In the pressure-sensitive adhesive tape for cloth, since the pressure-sensitive adhesive layer penetrates into the woven cloth, the amount of the hot-melt pressure-sensitive adhesive used is increased. Moreover, in order to raise the adhesiveness with respect to the rough surface of a cloth adhesive tape, it is necessary to enlarge the thickness of the adhesive layer. For this reason, the cost of a hot melt type adhesive increases.

  If the pressure-sensitive adhesive layer of the cloth pressure-sensitive adhesive tape is foamed and a large number of closed cells can be contained in the pressure-sensitive adhesive layer, the decrease in the pressure-sensitive adhesive force can be suppressed under low temperature conditions, and the pressure-sensitive adhesive force on the rough surface of the adherend can be reduced. It is expected that the adhesive strength at room temperature can be adjusted. If the pressure-sensitive adhesive layer is foamed, the thickness of the pressure-sensitive adhesive layer can be increased, so that the amount of hot-melt pressure-sensitive adhesive used can be reduced.

  In general, in the technical field of pressure-sensitive adhesive tape, as a method for forming a large number of closed cells in a pressure-sensitive adhesive layer, a method for forming a large number of fine closed cells in a pressure-sensitive adhesive layer using a heat decomposable foaming agent (hereinafter referred to as “the number of closed cells”) , Abbreviated as “chemical foaming method”); and by volatilizing volatile substances such as water applied to the substrate by heating, gasifying and expanding in the pressure-sensitive adhesive layer, a large number in the pressure-sensitive adhesive layer A method of forming closed cells (hereinafter abbreviated as “volatile foaming method”) is representative.

  As a chemical foaming method, for example, Japanese Patent Laid-Open No. 6-17015 (Patent Document 1) discloses a thermal decomposable foaming agent that does not decompose in a hot melt adhesive under mixing or application conditions of the hot melt adhesive (for example, Azodicarbonamide), and then hot-melt coating the mixture onto a substrate, and then decomposing the pyrolyzable foaming agent by heating to form a pressure-sensitive hot-melt adhesive-coated tape.

  By using such a chemical foaming method, the pressure-sensitive adhesive layer of the cloth pressure-sensitive adhesive tape can be foamed. However, the chemical foaming method (1) is capable of controlling the manufacturing conditions such as the uniform mixing of the hot-melt adhesive and the thermal decomposition-type foaming agent and the temperature conditions in the application of the hot-melt adhesive are limited. Difficult, (2) Pyrolytic foaming agent is expensive, (3) Since many pyrolytic foaming agents are present on the surface of the hot melt adhesive layer, In many cases, bursting of bubbles is observed on the surface, which not only impairs the appearance of the cloth adhesive tape, but also reduces the effective adhesive area and tends to reduce the adhesive force.

  As a volatile foaming method, for example, Japanese Patent Publication No. 2-29705 (Patent Document 2) discloses a pressure-sensitive adhesive tape including a liquid-absorbing base material and a pressure-sensitive adhesive layer mainly composed of a thermoplastic synthetic rubber. Then, a volatile substance is supplied into the liquid absorbent substrate, and then the volatile substance is infiltrated into the adhesive layer by heating and expanded by gasification to produce countless fine particles. A method for producing a pressure-sensitive adhesive tape that forms closed cells is disclosed. In an example of Patent Document 2, a pressure-sensitive adhesive based on a thermoplastic synthetic rubber is applied to the surface of kraft paper to prepare a kraft adhesive tape, and then the tape is heated to 40 ° C. and relative humidity. Store in a 90% atmosphere for 24 hours to allow the kraft paper to contain about 8% by weight moisture, then heat the kraft adhesive tape at 120 ° C. for 3 minutes to countless in the adhesive layer An experimental example in which closed cells are formed is shown.

  In Japanese Patent Publication No. 6-4827 (Patent Document 3), a coating layer having a softening point higher by 5 ° C. or more than the volatile substance is provided on one side of a porous substrate containing a vaporizable substance. A method for producing an adhesive tape is disclosed in which an adhesive layer is provided on the substrate and then heated to form innumerable closed cells in the adhesive layer. Patent Document 3 exemplifies paper, woven fabric, non-woven fabric, felt, porous plastic film, and the like as the porous substrate. In the examples, an experiment using kraft paper as the porous substrate is used. An example is only shown.

  Japanese Patent Application Laid-Open No. 10-140107 (Patent Document 4) includes a step of applying a volatile material to one side of a tape base material; a step of applying an adhesive to the surface to which the volatile material is applied; and a volatile material. A method for producing a pressure-sensitive adhesive tape is disclosed, which comprises the step of incorporating innumerable closed cells into the pressure-sensitive adhesive layer by gasifying the gas. Patent Document 4 exemplifies a plastic film, a non-woven fabric, a paper, a kraft paper, or a woven fabric in which each back surface is masked with a synthetic resin as a tape substrate. In Patent Document 4, water is applied to a woven fabric obtained by extrusion lamination of polyethylene, a hot melt adhesive is applied to the water application surface to prepare an adhesive tape, and then the adhesive tape is heated at 120 ° C. for 3 minutes. An example in which a cloth pressure-sensitive adhesive tape containing countless closed cells in the pressure-sensitive adhesive layer was produced is shown.

  In JP-A-11-61057 (Patent Document 5), a hot-melt adhesive is applied to a kraft base material impregnated with water, and the water impregnated in the craft base material is hot-melted during heating. In the method of manufacturing an adhesive tape that is transferred to a mold pressure-sensitive adhesive layer and forms a large number of fine bubbles in the hot-melt pressure-sensitive adhesive layer, the fine water droplets sprayed on the roll surface are transferred onto a craft substrate. A method for producing an adhesive tape is disclosed.

  As described above, various patent documents indicate that the volatile foaming method of volatile substances such as water can be applied to various adhesive tapes having a wide variety of base materials including craft adhesive tapes and cloth adhesive tapes. Yes. However, according to the examination results of the present inventors, when the woven fabric of the support of the fabric adhesive tape is made using a water-absorbing yarn such as a suf yarn, water is applied. However, since the polyethylene layer of the backing material repels water, water can be adsorbed only on the yarn portion of the woven fabric. The mesh portion of the woven fabric cannot adsorb water. For this reason, even if water is volatilized by heating and gasified in the pressure-sensitive adhesive layer, foaming of the pressure-sensitive adhesive layer becomes insufficient. Moreover, since the water distribution on the substrate surface is non-uniform, foaming of the pressure-sensitive adhesive layer becomes non-uniform, and it is extremely difficult to obtain a cloth pressure-sensitive adhesive tape having satisfactory adhesive properties.

  Furthermore, in order to foam the pressure-sensitive adhesive layer of the cloth pressure-sensitive adhesive tape to which water has been applied to the substrate by heating, the cloth pressure-sensitive adhesive tape is relatively heated at 120 ° C. for 3 minutes as disclosed in the Examples of Patent Document 4. Since it is necessary to heat for a long time, it is difficult to soften the polyethylene layer of the backing material and to foam the polyethylene layer or to manufacture a product having a uniform thickness. When the heating time at the temperature is shortened, the pressure-sensitive adhesive layer is difficult to foam. If the heating temperature is raised to shorten the heating time, foaming of the pressure-sensitive adhesive layer due to volatilization of water becomes extremely insufficient or no foaming occurs at all. If the amount of water applied to the substrate is increased, the amount of moisture absorbed by the woven fabric will increase, causing problems such as delamination between the woven fabric and the polyethylene layer and peeling of the adhesive layer from the substrate. .

  On the other hand, if a woven fabric made of non-absorbable yarn or filament is used as a support, water cannot be adsorbed not only in the polyethylene layer of the backing member but also in the yarn portion of the woven fabric. Foaming becomes even more difficult.

  On the other hand, since kraft paper can uniformly adsorb volatile substances such as water, it is relatively easy to apply the volatile foaming method to an adhesive tape based on kraft paper. For this reason, the present condition is that the adhesive tape to which the volatile foaming method is applied is limited to the craft adhesive tape.

JP-A-6-17015 Japanese Patent Publication No. 2-29705 Japanese Patent Publication No. 6-4827 JP-A-10-140107 Japanese Patent Laid-Open No. 11-61057

  An object of the present invention is to provide a cloth pressure-sensitive adhesive tape having a foamed pressure-sensitive adhesive layer in which a large number of closed cells are uniformly dispersed in a hot-melt pressure-sensitive adhesive layer by volatilization of a volatile substance, and a method for producing the same. is there.

  As a result of intensive studies to overcome the problems of the prior art as described above, the present inventors have found that calcium carbonate is added to a synthetic resin layer such as a polyethylene layer used as a backing material for a cloth adhesive tape substrate. It has been found that a volatile substance such as water can be uniformly applied to the woven fabric surface side of the base material by containing a porous filler such as. A pressure-sensitive adhesive tape provided with a hot-melt pressure-sensitive adhesive layer on the woven fabric surface side provided with the volatile substance is prepared, and then the pressure-sensitive adhesive tape is heated to volatilize the volatile substance. It can be gasified and expanded in the agent layer to form a large number of uniform closed cells.

  As another aspect of the present invention, a second material containing a porous filler in a specific ratio on the woven fabric surface side of a base material having a layer structure in which a synthetic resin layer is disposed as a backing material on one side of the woven fabric. A synthetic adhesive layer, uniformly applying a volatile substance such as water on the surface of the second synthetic resin layer, and further producing a cloth adhesive tape provided with a hot melt adhesive layer thereon, Next, by heating the pressure-sensitive adhesive tape, the volatile substance is volatilized and gasified and expanded in the hot-melt pressure-sensitive adhesive layer to form a large number of uniform closed cells, and a method for producing the same There is.

  As yet another aspect of the present invention, a base material on which a synthetic resin layer in which a coating layer is formed by applying a coating solution containing a hydrophilic polymer on the surface of the lining cloth on the synthetic resin layer of the backing material, Alternatively, there is a cloth pressure-sensitive adhesive tape using a base material on which a coating layer is formed by applying a coating solution containing a hydrophilic polymer from above the woven cloth surface side and a method for producing the same.

  It is preferable to use water as the volatile substance. In this case, by heating the pressure-sensitive adhesive tape at a relatively high temperature for a very short time, the water volatilizes and gasifies and expands in the hot-melt pressure-sensitive adhesive layer. A large number of uniform closed cells can be formed. By adopting such heat treatment conditions, softening and foaming of the synthetic resin layer such as the polyethylene layer of the backing material or the second synthetic resin layer can be prevented. For this reason, it is not always necessary to use a synthetic resin having a softening temperature higher than the boiling point of the volatile substance in forming the synthetic resin layer. On the surface of the foamed pressure-sensitive adhesive layer of the cloth pressure-sensitive adhesive tape of the present invention, the occurrence of bubble breakage due to the bursting of bubbles is slightly observed. The present invention has been completed based on these findings.

  According to the present invention, the following cloth adhesive tapes and methods for producing them are provided.

A cloth adhesive tape provided with a hot melt pressure-sensitive adhesive layer on the woven cloth surface side of a base material having a layer structure in which a synthetic resin layer is disposed as a backing material on one side of the woven cloth,
The synthetic resin layer is a synthetic resin layer formed from a synthetic resin composition containing 30 to 300 parts by weight of a porous filler with respect to 100 parts by weight of the synthetic resin; and
The cloth adhesive tape, wherein the hot-melt adhesive layer is a foamed adhesive layer containing a large number of closed cells formed by volatilization of a volatile substance.

A cloth adhesive tape provided with a hot melt pressure-sensitive adhesive layer on the woven cloth surface side of a base material having a layer structure in which a synthetic resin layer is disposed as a backing material on one side of the woven cloth,
A first synthetic resin layer is disposed as a backing material on one side of the woven fabric, and a second synthetic resin layer is provided in contact with the other surface of the woven fabric,
The second synthetic resin layer is a synthetic resin layer formed from a synthetic resin composition containing 30 to 300 parts by weight of a porous filler with respect to 100 parts by weight of the synthetic resin.
The hot melt pressure-sensitive adhesive layer is provided in contact with the second synthetic resin layer; and
The cloth adhesive tape, wherein the hot-melt adhesive layer is a foamed adhesive layer containing a large number of closed cells formed by volatilization of a volatile substance.

A cloth adhesive tape provided with a hot melt pressure-sensitive adhesive layer on the woven cloth surface side of a base material having a layer structure in which a synthetic resin layer is disposed as a backing material on one side of the woven cloth,
The synthetic resin layer is formed by forming a coating layer of a coating liquid containing a hydrophilic polymer on the surface of the woven fabric surface side, or the base material is hydrophilic from above the woven fabric surface side. A coating layer of a coating liquid containing a polymer is formed, and
The cloth adhesive tape, wherein the hot-melt adhesive layer is a foamed adhesive layer containing a large number of closed cells formed by volatilization of a volatile substance.

A method for producing a cloth adhesive tape in which a hot melt pressure-sensitive adhesive layer is provided on the woven cloth surface side of a substrate having a layer structure in which a synthetic resin layer is disposed as a backing material on one side of the woven cloth,
A base having a layer structure in which a synthetic resin layer formed from a synthetic resin composition containing 30 to 300 parts by weight of a porous filler with respect to 100 parts by weight of a synthetic resin is disposed as a backing material on one side of the woven fabric. Preparing material 1;
Step 2 of applying a volatile substance to the woven fabric surface side of the substrate;
Step 3 of forming a cloth adhesive tape provided with a hot melt adhesive layer by applying a hot melt adhesive on the woven cloth surface side of the substrate to which a volatile substance is applied;
Step 4 of heating the cloth adhesive tape to volatilize the volatile substance and expand it by gasification in the hot melt adhesive layer to form a large number of closed cells;
The manufacturing method of the cloth adhesive tape containing each process of these.

A method for producing a cloth adhesive tape in which a hot melt pressure-sensitive adhesive layer is provided on the woven cloth surface side of a substrate having a layer structure in which a synthetic resin layer is disposed as a backing material on one side of the woven cloth,
A first synthetic resin layer is disposed on one side of the woven fabric as a backing material, and in contact with the other surface of the woven fabric, contains 30 to 300 parts by weight of a porous filler with respect to 100 parts by weight of the synthetic resin. Step I of preparing a base material having a layer structure in which a second synthetic resin layer formed from a synthetic resin composition is disposed;
Providing a volatile substance on the surface of the second synthetic resin layer of the substrate II;
Step III of forming a cloth adhesive tape provided with a hot-melt pressure-sensitive adhesive layer by applying a hot-melt pressure-sensitive adhesive on the surface of the second synthetic resin layer provided with the volatile substance; and
Heating the cloth pressure-sensitive adhesive tape to volatilize the volatile substance and expand it by gasification in the hot-melt pressure-sensitive adhesive layer to form a large number of closed cells; IV
The manufacturing method of the cloth adhesive tape containing each process of these.

A method for producing a cloth adhesive tape in which a hot melt pressure-sensitive adhesive layer is provided on the woven cloth surface side of a substrate having a layer structure in which a synthetic resin layer is disposed as a backing material on one side of the woven cloth,
A base material using a synthetic resin layer in which a coating solution is formed by applying a coating solution containing a hydrophilic polymer to the surface of the synthetic resin layer on the woven fabric surface side, or hydrophilic from above the woven fabric surface side A step i of preparing a base material on which a coating layer is formed by applying a coating solution containing a polymer;
Applying a volatile substance to the woven fabric surface side of the substrate; ii;
A step iii of forming a cloth adhesive tape provided with a hot melt pressure-sensitive adhesive layer by applying a hot melt pressure-sensitive adhesive on the woven fabric surface side of the substrate to which a volatile substance is applied; and
Heating the cloth adhesive tape to volatilize the volatile material and expand it by gasification in the hot melt adhesive layer to form a large number of closed cells; iv;
The manufacturing method of the cloth adhesive tape containing each process of these.

  According to the present invention, even if the woven fabric of the support of the cloth adhesive tape is made using a non-water-absorbing yarn such as a polyester yarn, water or the like is uniformly applied to the surface of the synthetic resin layer of the backing material. Thus, there is no uneven distribution of the volatile material, and when heated and foamed, a number of uniformly dispersed cells can be formed in the pressure-sensitive adhesive layer. Even when the second synthetic resin layer is provided on the woven fabric surface side, a volatile substance such as water can be uniformly applied to the surface of the second synthetic resin layer, so there is no uneven distribution of the volatile substance. When heated and foamed, a large number of evenly dispersed closed cells can be formed in the pressure-sensitive adhesive layer.

  The cloth adhesive tape of the present invention has good adhesiveness at low temperature and adhesiveness to the rough surface of the adherend, and the adhesive force at room temperature is suppressed. The cloth adhesive tape of the present invention is excellent in cost performance because it does not use a pyrolytic foaming agent and can increase the thickness of the adhesive layer even if the amount of the adhesive used is reduced. .

  According to the production method of the present invention, the foamed pressure-sensitive adhesive layer having a relatively uniform thickness can be formed in such a degree that bubbles are slightly observed on the surface of the foamed pressure-sensitive adhesive layer. In the production method of the present invention, when water is used as the volatile substance, the water is volatilized and gasified and expanded in the pressure-sensitive adhesive layer by adopting foaming conditions of heating at a relatively high temperature for a very short time. Many closed cells can be formed. For this reason, softening or foaming of the synthetic resin layer and the second synthetic resin layer of the backing material can be effectively suppressed.

FIG. 1 is a schematic cross-sectional view showing an example of the layer structure of the cloth adhesive tape of the present invention. FIG. 2 is a schematic cross-sectional view showing an example of another layer configuration of the cloth adhesive tape of the present invention. FIG. 3 is a process diagram showing an example of a method for producing the cloth adhesive tape of the present invention.

  In the first aspect of the cloth adhesive tape of the present invention, a hot melt pressure-sensitive adhesive layer is formed directly on the woven cloth surface side of a substrate having a layer structure in which a synthetic resin layer is disposed as a backing material on one side of the woven cloth. The hot melt pressure-sensitive adhesive layer has a number of closed cells generated by volatilization of a volatile substance. The synthetic resin layer of the backing material contains a porous filler.

  The second aspect of the cloth adhesive tape of the present invention is a structure in which a synthetic resin layer is disposed on one side of a woven cloth as a backing material, and the second synthetic resin layer is interposed on the woven cloth side of the substrate. The hot-melt pressure-sensitive adhesive layer has a layer structure provided with a hot-melt pressure-sensitive adhesive layer, and the hot-melt pressure-sensitive adhesive layer contains a large number of closed cells generated by volatilization of volatile substances. The second synthetic resin layer contains a porous filler. In the second aspect, the synthetic resin layer of the backing material does not need to contain a porous filler, but may contain an arbitrary amount of a porous filler as desired.

  The third aspect of the cloth adhesive tape of the present invention is a synthetic resin layer in which a coating liquid containing a hydrophilic polymer is applied to form a coating layer on the surface of the synthetic resin layer of the backing material on the woven cloth side. This is a cloth adhesive tape using a base material on which the coating layer is formed by applying a coating liquid containing a hydrophilic polymer from above the woven fabric surface side. The hot melt pressure-sensitive adhesive layer provided on the surface of the substrate on the woven fabric side contains a large number of closed cells generated by the volatilization of the volatile substance. In the third aspect, the synthetic resin layer of the backing material does not need to contain a porous filler, but may contain an arbitrary amount of a porous filler as desired.

  As the woven fabric of the support, various woven fabrics used in the technical field of cloth adhesive tape can be used. Specific examples of the woven fabric include, for example, a woven fabric of staple yarn (rayon staple fiber) (for example, a fine weave plain weave; sometimes referred to as “muslin”), a strong man silk fabric, a nylon fabric, a polyester fabric, a polyolefin. Examples thereof include cloth, acetate cloth, and glass cloth. The yarn may be a monofilament or a multifilament. Among these, a woven fabric of staple yarn is preferable in terms of water absorption or hydrophilicity, but is not limited thereto.

  Examples of the synthetic resin used to form the synthetic resin layer of the backing material include polyolefins such as polyethylene and polypropylene; polyvinyl chloride; thermoplastic polyesters such as polyethylene terephthalate; acrylic resins; Among these synthetic resins, polyethylene which is inexpensive and can be laminated on one side of a woven fabric by melt extrusion is preferable.

  Examples of polyethylene include a homopolymer of ethylene and a copolymer of ethylene and an α-olefin (for example, propylene, 1-butene, 1-hexene, 1-octene). Examples of polyethylene include high density polyethylene, medium density polyethylene, low density polyethylene, linear low density polyethylene, and ultra low density polyethylene. Among these, high density polyethylene and low density polyethylene are preferable.

The high density polyethylene has a density measured according to ASTM D792 of 0.942-0.970 g / cm ³ and a melt flow rate (MFR) measured at 190 ° C. according to ASTM D1236 of usually 0.1-20 g / 10 min, preferably Is 0.3 to 10 g / 10 min, and the melting point measured by a differential scanning calorimeter is usually 120 to 140 ° C., preferably 123 to 135 ° C.

Low density polyethylene has a density measured according to ASTM D792 of 0.915 to 0.925 g / cm ³ and a melt flow rate (MFR) measured at 190 ° C. according to ASTM D1236 of usually 0.05 to 50 g / 10 min, preferably Is 0.1 to 30 g / 10 min, and the melting point measured by a differential scanning calorimeter is usually 100 to 115 ° C., preferably 105 to 110 ° C.

  A synthetic resin layer such as a polyethylene layer is laminated on a woven fabric by melt extrusion lamination, dry lamination or the like, and among these, melt extrusion lamination is preferable. In the first and third aspects of the present invention, the thickness of the synthetic resin layer such as a polyethylene layer forming the backing material is usually in the range of 20 to 100 μm, preferably 40 to 80 μm. In the second aspect of the present invention, the thickness of the synthetic resin layer such as polyethylene forming the backing material is usually in the range of 10 to 50 μm, preferably 20 to 40 μm. If the thickness of the synthetic resin layer of the backing material is too thin, softening or deformation occurs during heating and foaming, and volatile substances such as water are likely to be volatilized through the backing material. When the thickness of the synthetic resin layer of the backing material is too thick, the flexibility, heat resistance, cold resistance and the like of the cloth adhesive tape tend to decrease.

  In the first aspect of the present invention, a porous filler is contained in the synthetic resin layer of the backing material. In the second aspect of the present invention, a porous filler is contained in the second synthetic resin layer. The second synthetic resin layer can be formed using the same kind of synthetic resin as polyethylene used for the backing material.

  The thickness of the second synthetic resin layer is usually 5 to 60 μm, preferably 10 to 50 μm, more preferably 20 to 40 μm. If the thickness of the second synthetic resin layer is too thin, softening or deformation occurs during heating and foaming, or volatile substances such as water are likely to volatilize to the substrate side through the second synthetic resin layer. The second synthetic resin layer can be laminated on the woven fabric surface by melt extrusion lamination, dry lamination or the like, and among these, a method of forming by extrusion lamination is preferable.

  The porous filler means inorganic particles having an apparent specific gravity smaller than the true specific gravity of the filler and having a porous structure therein. Examples of the porous filler include calcium carbonate such as heavy calcium carbonate and light / collar calcium carbonate; silica such as natural silica and synthetic silica; viscosity mineral mainly composed of kaolinite such as kaolin and clay; talc; Etc. These porous fillers can be used alone or in combination of two or more. Among these porous fillers, calcium carbonate is preferable.

  The amount ratio of the porous filler contained in the synthetic resin layer or the second synthetic resin layer of the backing material is 30 to 300 parts by weight, preferably 40 to 250 parts by weight, with respect to 100 parts by weight of the synthetic resin. Preferably it is 50-200 weight part, Most preferably, it exists in the range of 60-150 weight part. If the content of the porous filler is too small, it becomes impossible to uniformly apply volatile substances such as water to the surface of the synthetic resin layer, and uniform foaming becomes difficult or impossible. If the content of the porous filler is too large, the adhesion to the woven fabric will be reduced, or the volatile substance will be easily volatilized through the synthetic resin layer when the volatile substance such as water is heated and foamed. It may be difficult to form the foamed pressure-sensitive adhesive layer.

  The synthetic resin layer and / or the second synthetic resin layer used as the backing material can contain a styrene-based elastomer in order to improve adhesion (sticking property) with the hot melt pressure-sensitive adhesive layer. In the cloth pressure-sensitive adhesive tape according to the first aspect of the present invention, the pressure-sensitive adhesive layer soaks into the woven cloth existing between the synthetic resin layer of the backing material and the hot-melt pressure-sensitive adhesive layer. The anchoring property is good, but the anchoring property can be further improved by containing a styrene elastomer. In the cloth pressure-sensitive adhesive tape according to the second aspect of the present invention, it is preferable that the second synthetic resin layer contains a styrene-based elastomer in order to improve the anchoring property of the hot-melt pressure-sensitive adhesive layer.

  Examples of the styrene elastomer include hydrogenated styrene butadiene copolymer (HSBR), styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene-butylene block copolymer (SEBS), and styrene-isoprene-styrene. Although a block copolymer (SIS), a styrene-ethylene-propylene copolymer, etc. are mentioned, HSBR is preferable among these.

  When the styrene elastomer is contained in the synthetic resin layer, the styrene elastomer is usually 1 to 40 parts by weight, preferably 3 to 30 parts by weight, more preferably 5 to 20 parts by weight with respect to 100 parts by weight of the synthetic resin. Use in proportions of parts. If the content of the styrene-based elastomer is too small, the effect of improving the anchoring property is reduced, and if it is too large, the effect of improving the anchoring property is saturated and it is not economical.

  The synthetic resin layer and / or the second synthetic resin layer used as the backing material can be subjected to corona treatment or plasma treatment in order to increase the affinity with a volatile substance such as water. If the blending ratio of the porous filler such as calcium carbonate contained in the synthetic resin layer is relatively small, such as less than 50 parts by weight, and further less than 40 parts by weight, the hydrophilicity of the surface may be insufficient. is there. For this reason, when using water as a volatile substance, there exists a possibility that it may not apply | coat uniformly on the surface of a synthetic resin layer. It is preferable to adjust the surface tension of the synthetic resin layer to at least 35 or 40 dyn / cm or more, preferably 35 to 50 dyn / cm by performing corona treatment or plasma treatment.

  The synthetic resin layer and / or the second synthetic resin layer used as the backing material contains a porous polymer in addition to a hydrophilic polymer (including a water-absorbing polymer) on the surface thereof. This coating layer can be provided to enhance the affinity with water used as a volatile substance. The type and coating amount of the hydrophilic polymer will be described in relation to the third aspect of the cloth adhesive tape of the present invention, as will be described later.

  It is preferable to provide a release agent layer on the back surface (surface opposite to the woven fabric) of the synthetic resin layer of the backing material. By providing a release agent layer, when the cloth adhesive tape wound in a roll is rewound and used, the adhesive layer strongly adheres to the back surface of the synthetic resin layer of the backing material, making it difficult to unwind. Can be prevented.

Examples of the release agent include silicone release agents, fluorine-containing polymer release agents, and long-chain alkyl release agents. Of these, long-chain alkyl release agents are preferred. The release agent is applied to the back surface of the synthetic resin layer of the backing material, and the coating amount is usually in the range of 0.1 to 3.0 g / m ² , preferably 0.5 to 1.5 g / m ² . It is.

  In the third aspect of the cloth adhesive tape of the present invention, a synthetic resin layer in which a coating liquid containing a hydrophilic polymer is applied to form a coating layer is disposed on the surface of the synthetic resin layer of the backing material on the woven cloth side. Or a substrate on which a coating layer is formed by applying a coating solution containing a hydrophilic polymer from above the woven fabric surface side. In the third embodiment, it is not necessary to contain a porous filler in the synthetic resin layer of the backing material, but it may be contained if desired.

Examples of the hydrophilic polymer (including a water-absorbing polymer) include polyvinyl alcohol, ethylene-vinyl alcohol copolymer, polyvinyl pyrrolidone, carboxymethyl cellulose, gelatin, polyalkylene oxide, and the like. For example, the hydrophilic polymer is applied from the surface of the synthetic resin layer of the backing material on the woven fabric surface side or on the woven fabric surface side using the aqueous solution as a coating solution. The coating amount is usually in the range of 5 to 100 g / m ² , preferably 10 to 50 g / m ² . When the hydrophilic polymer coating solution is applied to the surface of the synthetic resin layer (the synthetic resin layer of the backing material or the second synthetic resin layer) containing the porous filler, the amount applied is the same as described above. It is desirable to adjust within the range.

  Examples of the volatile substance include water, an aqueous solution (for example, an aqueous solution containing a surfactant), an aqueous volatile substance such as an aqueous dispersion, and a volatile solvent such as alcohol, methyl ethyl ketone, and toluene. Among these, water is particularly preferable because it is easy to form a large number of fine closed cells in the pressure-sensitive adhesive layer and there is no problem of environmental pollution due to volatilization.

  Examples of methods for applying volatile substances include spraying, spreading, coating (coating using rolls, blades, brushes, etc.), immersion, moisture absorption in a high humidity environment, and transfer (for example, water sprayed roll surface). Transfer of water due to contact with water). Among these, the method by spraying or coating is preferable because it is simple and the dosage (coating amount) can be precisely adjusted.

The application amount of the volatile substance is usually 1 to 20 ml / m ² , preferably ² to 15 ml / m ² , more preferably 3 to 10 ml / m ² . The amount of volatile substance applied can be varied depending on the desired degree of foaming, the thickness of the pressure-sensitive adhesive layer, the desired pressure-sensitive adhesive properties, and the like. If the amount of the volatile substance applied is too small, sufficient foaming is difficult to occur. .

  As the hot melt adhesive, a rubber-based hot melt adhesive is preferable. The rubber-based hot-melt pressure-sensitive adhesive contains an elastomer base and a tackifier, and if necessary, various additives such as a filler, a softener, a plasticizer, a UV absorber, and an anti-aging agent are blended. Is.

  Examples of the elastomer include styrene-based thermoplastic elastomers such as styrene-isoprene-styrene block copolymer (SIS) and styrene-butadiene-styrene block copolymer (SBS); natural rubber; butyl rubber, isobutylene rubber, isoprene rubber, and the like. And a mixture of two or more of these. Among these, a styrene thermoplastic elastomer or a blend rubber of a styrene thermoplastic elastomer and another rubber is preferable, and SIS is more preferable.

  Examples of styrenic thermoplastic elastomers are ZEON Corporation Quintac (registered trademark), Shell Chemical Co., Ltd. Kraton (registered trademark), Califlex TR (registered trademark), JSR JSR SIS (registered trademark), JSR TR ( (Registered trademark), Taffeprene (registered trademark) manufactured by Asahi Kasei Kogyo Co., Ltd., Solprene-T (registered trademark) manufactured by Nippon Elastomer Co., Ltd., Denka STR (registered trademark) manufactured by Denki Kagaku Kogyo Co., Ltd., etc. are commercially available.

Examples of tackifiers include natural products such as rosin resins and terpene resins and derivatives thereof, aliphatic petroleum resins, alicyclic petroleum resins, aromatic petroleum resins, coumarone indene resins, styrene resins, phenols. And synthetic resins such as xylene resins and xylene resins. Petroleum resins can also be classified into synthetic petroleum resin (C ₅ ) series and synthetic petroleum resin (C ₉ ) series.

  Examples of the rosin-based resin include polypeel resin, stevelite resin, formal AX, pentalin A, pentalin H (above, Rika Hercules Co., registered trademark), ester gum A, ester gum H (above, Arakawa Chemical Co., Ltd.) And Harrier Star T (registered trademark, manufactured by Harima Kasei Co., Ltd.). Examples of the rosin phenol resin include Sumilite Resin PR12603 (manufactured by Sumitomo Durez, registered trademark), Tamanol 803 (manufactured by Arakawa Chemical, registered trademark), and the like.

  Examples of the terpene resin include YS resin Px, YS resin TO, YS polystar T [registered trademark] manufactured by Yasuhara Chemical Co., Ltd., picolite A (manufactured by Hercules Co., registered trademark), Scientecty SP566 (manufactured by Schenectady, Registered trademark).

  As the aliphatic petroleum resin, for example, Picopale (manufactured by Hercules, registered trademark), Escorez (manufactured by Esso Chemical Co., registered trademark), Wing Tack (manufactured by Goodyear, registered trademark), Highlets (manufactured by Mitsui Petrochemical Co., Ltd., Registered trademark), Quinton (manufactured by Nippon Zeon Co., Ltd., registered trademark), Marcaretz (manufactured by Maruzen Petrochemical Co., Ltd., registered trademark), Corporex (manufactured by Toho Petrochemical Co., Ltd., registered trademark) and the like.

  Examples of the alicyclic petroleum resin include Alcon P and Alcon M (registered trademark, manufactured by Arakawa Chemical Co., Ltd.). Examples of the aromatic petroleum resin include petrozine (manufactured by Mitsui Petrochemical Co., Ltd.) and high resin (manufactured by Toho Petroleum Resin Co., Ltd.). Examples of the coumarone indene resin include coumarone NG [manufactured by Nippon Steel Chemical Co., Ltd.].

  Examples of the styrene resin include Piccolastic A (manufactured by Hercules). Examples of the phenol resin include hitanol (manufactured by Hitachi Chemical Co., Ltd.), tackolol (manufactured by Sumitomo Chemical Co., Ltd.), cash register top (manufactured by Gunei Chemical Industry Co., Ltd.), and the like. Examples of the xylene resin include Nicanol (manufactured by Mitsubishi Gas Chemical Company).

  These tackifiers can be used alone or in combination of two or more. The compounding ratio of the tackifier is usually 10 to 150 parts by weight, preferably 30 to 140 parts by weight, and more preferably 50 to 130 parts by weight with respect to 100 parts by weight of the elastomer. By blending a tackifier, self-adhesive strength and adhesive strength at room temperature can be imparted to the adhesive component.

  Examples of fillers include calcium carbonate, zinc white (zinc oxide), silica, aluminum silicate, talc, diatomaceous earth, silica sand, pumice powder, slate powder, mica powder, asbestos, aluminum sol, alumina white, sulfuric acid Aluminum, barium sulfate, lithopone, calcium sulfate, molybdenum disulfide, graphite, glass fiber, glass sphere, single crystal potassium titanate, carbon fiber, activated zinc white, zinc carbonate, magnesium oxide, basic magnesium carbonate, risurge, red lead Lead white, calcium hydroxide, activated calcium hydroxide, titanium oxide and the like.

  Among these fillers, calcium carbonate, zinc white, silica, titanium oxide and the like are preferable. When these fillers are blended, appropriate cohesiveness can be imparted to the pressure-sensitive adhesive. The average particle size of the filler is preferably 5 μm or less. When the fine particles (B) having an average particle size of 5 μm or less are used in combination with the fine particles (A) having a large particle size, it becomes easy to adjust the cohesive force and the adhesive force within an appropriate range.

  When using a filler, the compounding ratio is 0.1-150 weight part normally with respect to 100 weight part of elastomer components, Preferably it is 1-100 weight part, More preferably, it is 3-60 weight part. If the blending ratio of the filler is too small, the effect of addition becomes insufficient, and if it is too large, the addition becomes difficult or the physical properties are lowered.

  Examples of the softener include petroleum softeners, vegetable oil softeners, liquid rubber, liquid tackifying resins, and synthetic plasticizers. By blending a softening agent, characteristics such as cohesion can be controlled.

  Examples of petroleum softeners include paraffinic process oil, naphthenic process oil, aromatic process oil, and extender oil. Examples of vegetable oil-based softeners include castor oil, cottonseed oil, linseed oil, rapeseed oil, soybean oil, palm oil, coconut oil, peanut oil, tall oil, and the like.

  Examples of the synthetic plasticizer include phthalic acid derivatives such as diethyl phthalate and dibutyl phthalate; isophthalic acid derivatives such as dimethyl isophthalate and diisooctyl phthalate; tetrahydrophthalic acid derivatives such as di- (2-ethylhexyl) tetrahydrophthalate; -Adipic acid derivatives such as n-butyl adipate and di- (2-ethylhexyl) adipate; azelain derivatives such as diisooctyl azelate; sebacic acid derivatives such as di-n-butyl sebacate; maleic acid derivatives such as dimethyl malate; Fumaric acid derivatives such as di-n-butyl fumarate; trimellitic acid derivatives such as triisooctyl trimetrate; citric acid derivatives such as triethyl citrate; itaconic acid derivatives such as diethyl itaconate; glyceryl monooleate Oleic acid derivatives; Ricinol derivatives such as butyl, acetyl and ricinolate; Stearic acid derivatives such as n-butyl and stearate; Fatty acid derivatives such as diethylene glycol and monourarate; Sulfonic acid derivatives such as benzenesulfone and butylamide; Trimethyl phosphate and the like Phosphoric acid derivatives; Monoester plasticizers such as tetra-2-ethylhexyl and pyromellite; Glycol derivatives such as diethylene glycol and dibenzoate; Glycerin derivatives such as glycerol and monoacetate; Paraffin derivatives such as chlorinated paraffin; Epoxy derivatives And polyester plasticizers and polyether plasticizers.

  These softening agents are selected and used in consideration of compatibility with elastomers and the like. When the softening agent is used, it is usually used in a proportion of 0.1 to 200 parts by weight, preferably 1 to 100 parts by weight, more preferably 3 to 80 parts by weight with respect to 100 parts by weight of the elastomer. When the blending ratio of the softening agent is too small, the effect of the addition becomes insufficient, and when it is too large, various properties as a hot melt pressure-sensitive adhesive are easily lowered.

  Examples of ultraviolet absorbers include salicylic acid derivatives, benzophenone compounds, benzotriazole compounds, and cyanoacrylate compounds. When an ultraviolet absorber is used, it is usually added at a ratio of 0.1 to 5 parts by weight with respect to 100 parts by weight of the elastomer.

  Antiaging agents include naphthylamine compounds, diphenylamine compounds, p-phenylenediamine compounds, other amine compounds, amine compound mixtures, quinoline compounds, hydroquinone derivatives, monophenol compounds, bisphenol compounds, trisphenol compounds. Examples thereof include compounds, polyphenol compounds, and thiobisphenol compounds. The blending ratio of the anti-aging agent is not particularly limited, but is usually 0.1 to 5 parts by weight, preferably 0.5 to 2 parts by weight with respect to 100 parts by weight of the elastomer.

  FIG. 1 is a schematic cross-sectional view showing an example of the layer configuration of the first embodiment of the cloth adhesive tape of the present invention. A synthetic resin layer 2 containing a porous filler as a backing material is disposed on the back surface (the surface opposite to the pressure-sensitive adhesive layer) of the woven fabric 3 of the support, and on the back surface of the synthetic resin layer 2 Is provided with a release agent layer 1. Although the release agent layer 1 can be omitted depending on the form of the cloth adhesive tape, it is preferable to provide the release agent layer 1 when the cloth adhesive tape is wound into a roll. A hot melt pressure-sensitive adhesive layer (foamed pressure-sensitive adhesive layer) 4 containing a large number of closed cells formed by volatilization of a volatile substance is formed on the surface of the woven fabric 3.

  FIG. 2 is a schematic cross-sectional view showing an example of the layer configuration of the second embodiment of the cloth adhesive tape of the present invention. A synthetic resin layer (first synthetic resin layer) 22 is disposed as a backing material on the back surface (surface opposite to the pressure-sensitive adhesive layer) of the woven fabric 23 of the support. The first synthetic resin layer 22 does not need to contain a porous filler, but if necessary, an appropriate amount of porous filler (300 parts by weight or less of the porous filler with respect to 100 parts by weight of the synthetic resin) is added. You may make it contain. A release agent layer 21 is preferably provided on the back surface of the synthetic resin layer 22 of the backing material. A second synthetic resin layer 24 containing a porous filler is formed on the surface of the woven fabric 23 and contains a number of closed cells formed by volatilization of volatile substances on the surface. A hot-melt pressure-sensitive adhesive layer 25 is formed.

  Although the third embodiment of the cloth adhesive tape of the present invention is not shown, for example, "release agent layer / synthetic resin layer of backing material / coated layer of hydrophilic polymer / woven cloth / foamed adhesive layer", or It has a layer structure of "release agent layer / backing material synthetic resin layer / woven fabric / hydrophilic polymer coating layer / foamed adhesive layer". The synthetic resin layer of the backing material does not need to contain a porous filler, but if necessary, an appropriate amount (300 parts by weight or less of the porous filler with respect to 100 parts by weight of the synthetic resin) contains a porous filler. be able to.

FIG. 3 is a schematic diagram (cross-sectional view) showing an example of the manufacturing process of the cloth adhesive tape according to the first aspect of the present invention. The cloth pressure-sensitive adhesive tape according to the first aspect of the present invention has a hot melt pressure-sensitive adhesive layer on the woven cloth surface side of a base material having a layer structure in which a synthetic resin layer is disposed as a backing material on one side of the woven cloth. In the manufacturing method of the provided cloth adhesive tape,
(1) Layer structure in which a synthetic resin layer formed from a synthetic resin composition containing 30 to 300 parts by weight of a porous filler with respect to 100 parts by weight of a synthetic resin is disposed as a backing material on one side of the woven fabric Preparing a substrate having
(2) Step 2 of applying a volatile substance to the woven fabric surface side of the substrate;
(3) Step 3 of forming a cloth adhesive tape provided with a hot melt pressure-sensitive adhesive layer by applying a hot-melt pressure-sensitive adhesive on the woven cloth side of the base material to which a volatile substance has been applied. As well as
(4) Step 4 of heating the cloth pressure-sensitive adhesive tape to volatilize the volatile substance and expand it by gasification in the hot-melt pressure-sensitive adhesive layer to form a large number of closed cells;
It can manufacture with the manufacturing method of the cloth adhesive tape containing each process of these.

  As shown in FIG. 3, water was applied to the woven fabric surface side of the fabric adhesive tape substrate (FIG. 3 a) having a layer configuration of “release agent layer 31 / backing synthetic resin layer 32 / woven fabric 33”. A uniform water application layer 34 is formed (FIG. 3b). The application of water is preferably performed by spraying. In FIG. 3b, a water application layer 34 is shown on the woven fabric 33 for easy understanding of the layer structure, but in actuality, water adheres to the surface of the synthetic resin layer 32 of the backing material. At the same time, it permeates the surface of the woven fabric 33 and / or the inside of the woven fabric 33.

  A hot melt pressure-sensitive adhesive is applied on the water application layer 34 to form a hot melt pressure-sensitive adhesive layer 35 (FIG. 3c). Next, the cloth adhesive tape of FIG. 3c is heated to volatilize water and expand by gasification in the hot-melt adhesive layer to form a foamed adhesive layer 36 containing a large number of closed cells.

  Although FIG. 3 shows an example in which water is used as a volatile substance, a volatile solvent other than water can be used. When using a volatile solvent, heat to a temperature above the boiling point of the volatile solvent and below the melting temperature of the hot-melt adhesive to volatilize the volatile solvent and gasify in the hot-melt adhesive layer. To form a foamed pressure-sensitive adhesive layer containing a large number of closed cells. The application amount of the volatile substance is determined in consideration of the thickness of the hot melt pressure-sensitive adhesive layer and the desired degree of foaming.

When water is used as the volatile material, the application amount of water (coating amount) of usually 1~20ml / ^{m 2,} preferably adjusted 2~15ml / ^{m 2,} more preferably in the range of 3~10ml / ^{m 2} To do. In the heating step 4, the cloth adhesive tape is heated to 90 to 180 ° C, preferably 100 to 170 ° C, more preferably 110 to 165 ° C, particularly preferably 125 to 160 ° C, and usually 0.5 to 10 seconds. Preferably, it is desirable to heat for 1 to 8 seconds, more preferably 2 to 7 seconds.

  In this way, by employing the heating condition of heating at a relatively high temperature for a very short time, water can be volatilized and gasified and expanded in the pressure-sensitive adhesive layer to form a large number of closed cells. For this reason, softening or foaming of the synthetic resin layer of the backing material can be effectively suppressed. After heating and foaming, a pressure-sensitive adhesive layer containing a large number of closed cells is formed. By immediately cooling the pressure-sensitive adhesive layer, the closed cells can be fixed in the pressure-sensitive adhesive layer. Since the heating conditions for foaming are extremely short, the pressure-sensitive adhesive layer can be easily cooled by contact with air cooling or a cooling gas.

The cloth pressure-sensitive adhesive tape according to the second aspect of the present invention has a hot melt pressure-sensitive adhesive layer on the woven cloth surface side of a base material having a layer structure in which a synthetic resin layer is disposed as a backing material on one side of the woven cloth. In the manufacturing method of the provided cloth adhesive tape,
(I) A first synthetic resin layer is disposed as a backing material on one side of the woven fabric, and in contact with the other surface of the woven fabric, 30 to 300 weights of porous filler with respect to 100 parts by weight of the synthetic resin. Step I of preparing a base material having a layer structure in which a second synthetic resin layer formed from a synthetic resin composition containing parts is disposed;
(II) Step II of applying a volatile substance on the second synthetic resin layer surface of the substrate;
(III) Step III of forming a cloth adhesive tape provided with a hot-melt adhesive layer by applying a hot-melt adhesive on the surface of the second synthetic resin layer to which the volatile substance has been applied; And
(IV) Step IV in which the cloth adhesive tape is heated to volatilize the volatile substance and expand by gasification in the hot melt adhesive layer to form a large number of closed cells;
It can manufacture with the manufacturing method of the cloth adhesive tape containing each process of these.

  In the method for manufacturing the cloth adhesive tape of the second aspect, the method for applying a volatile substance such as water, the amount applied, the heating foaming conditions, and the like are the same as the method for manufacturing the cloth adhesive tape of the first aspect.

The cloth pressure-sensitive adhesive tape of the third aspect of the present invention has a hot melt pressure-sensitive adhesive layer on the woven cloth surface side of a base material having a layer structure in which a synthetic resin layer is disposed as a backing material on one side of the woven cloth. In the manufacturing method of the provided cloth adhesive tape,
(I) A base material using a synthetic resin layer formed by applying a coating solution containing a hydrophilic polymer to the surface of the synthetic resin layer on the woven fabric surface side, or on the woven fabric surface side A step i of preparing a substrate on which a coating layer is formed by applying a coating solution containing a hydrophilic polymer from
(Ii) a step ii of applying a volatile substance to the woven fabric surface side of the substrate;
(Iii) Step iii of forming a cloth pressure-sensitive adhesive tape provided with a hot-melt pressure-sensitive adhesive layer by applying a hot-melt pressure-sensitive adhesive on the woven fabric surface side to which the volatile substance of the substrate is applied. As well as
(Iv) Step iv of heating the cloth adhesive tape to volatilize the volatile substance and expanding it by gasification in the hot melt adhesive layer to form a large number of closed cells;
It can manufacture with the manufacturing method of the cloth adhesive tape containing each process of these.

  In the method for manufacturing the cloth adhesive tape of the third aspect, the method for applying a volatile substance such as water, the application amount, the heating foaming conditions, and the like are the same as the method for manufacturing the cloth adhesive tape of the first aspect.

In the cloth adhesive tape of the present invention, the total thickness of the synthetic resin layer of the backing material and the woven cloth is usually 100 to 300 μm, preferably 150 to 280 μm, more preferably 190 to 250 μm. The application amount of the pressure-sensitive adhesive layer before foaming is usually in the range of 50 to 150 g / m ² , preferably 60 to 140 g / m ² , more preferably 65 to 135 g / m ² . The total thickness of the cloth pressure-sensitive adhesive tape of the present invention after foaming of the pressure-sensitive adhesive layer is usually 200 to 400 μm, preferably 250 to 350, more preferably 280 to 330 μm. Since the support is a woven fabric, when melt extrusion lamination of the synthetic resin layer of the backing material is performed, the woven fabric soaks into the synthetic resin layer to reduce the total thickness. Similarly, when a hot-melt adhesive is applied on the surface of the woven fabric, the adhesive soaks into the woven fabric, so that the total thickness is reduced.

On the surface of the foamed hot-melt pressure-sensitive adhesive layer of the present invention, a slight amount of bubble breakage due to bursting of bubbles is observed. The closed cells contained in the foamed hot-melt pressure-sensitive adhesive layer have a bubble diameter in the range of 10 to 300 μm, and the number of bubbles is 100 to 10,000, depending on the thickness of the pressure-sensitive adhesive layer and desired adhesive properties. It is desirable to be within the range of (pieces / cm ² ). The cloth pressure-sensitive adhesive tape of the present invention is excellent in cushioning properties because the diameter of the bubbles contained in the pressure-sensitive adhesive layer is larger than that of a chemical foamed product obtained using a pyrolytic foaming agent. For this reason, it is also easy to reduce the usage-amount of a hot-melt-type adhesive.

  As for the cloth adhesive tape of this invention, it is desirable for a hot-melt-type adhesive layer to have a thickness comparable as a non-foaming conventional product. When the foamed pressure-sensitive adhesive layer has the same thickness as that of the conventional product, the amount of hot-melt pressure-sensitive adhesive used as a raw material can be reduced. The adhesive properties such as the adhesive strength of the cloth adhesive tape of the present invention are desirably equivalent to that of a conventional product in which the hot melt adhesive layer is non-foamed. However, since the pressure-sensitive adhesive layer of the cloth adhesive tape of the present invention is foamed, it has excellent adhesion to the rough surface of the adherend, low-temperature adhesive strength, removability to the adherend such as cardboard, and the like. Therefore, the adhesive properties related to these may not necessarily be equivalent to those of conventional products.

  The cloth adhesive tape of the present invention has an adhesive force of 6 to 20 (N / 25 mm), a ball tack (No.) of 25 or more, and a cardboard holding force of 400 (min / 25 × 25 mm · 1 kg) or more, preferably 500 ( Min / 25 × 25 mm · 1 kg) or more, more preferably 1000 (min / 25 × 25 mm · 1 kg) or more. The method for measuring these adhesive properties is as described in the examples.

  Hereinafter, the present invention will be described in detail with reference to examples and comparative examples. The measuring method of various characteristics is as follows.

(1) Thickness:
The thickness and total thickness of each layer were measured using a dial gauge with an accuracy of 1/100 mm. The measurement points of each sample were 10 points, and the average value was obtained.

(2) Bubble diameter and bubble number:
The foamed adhesive layer was sliced in the longitudinal direction (MD), and a microscope photograph (100 times) of the cross section was taken. The bubble diameter and the number of bubbles in the pressure-sensitive adhesive layer were calculated based on a microscope photograph. The bubble diameter (μm) is indicated by the width between the minimum value and the maximum value. Regarding the number of bubbles, the number per 1 cm ² was calculated.

(3) Adhesive strength:
A fabric adhesive tape sample cut to a width of 25 mm is pasted on the surface of a smooth and clean stainless steel plate at a temperature of 23 ° C. on the adhesive layer surface, and then a 2 kg load roller is applied at a speed of 300 mm / min. The cloth adhesive tape was pressure-bonded to the stainless steel plate by reciprocating once on the back surface. After leaving in this state for 20 minutes, the sample was peeled from the stainless steel plate with a tensile tester (Instron type tensile tester) at a peeling speed of 300 mm / min and a peeling angle of 180 degrees. The unit was N / 25 mm.

(4) Ball tack:
The cloth adhesive tape is placed on an inclined base having an angle of 30 degrees, a runway 10 cm, and a bottom 10 cm with the adhesive surface facing up. Rolling 32 kinds of bearing balls from 10cm on the runway from 1/32 to 1 inch in diameter, the largest No. of balls stopped on the adhesive surface. Was used as the tack value.

(5) Cardboard holding force:
1. Equipment and materials used 1.1 Automatic holding force tester An automatic holding force tester comprising a test plate (corrugated cardboard) holding part, a load part, and a limit switch part and having a structure capable of vertically mounting a weight was used.

1.2 Hour meter A time meter that can display the weight drop time in minutes was used.

1.3 Test plate A kraft liner double-sided cardboard (thickness: about 5 mm, class A liner product) defined in JIS P 3902 (corrugated cardboard liner) was cut into a width of 50 mm and a length of 50 mm was used as a test plate.

1.4 Pressure roller The surface is coated with a rubber layer with a spring hardness of 80 ± 5Hs and a thickness of about 6mm specified in JIS K 6301 (vulcanized rubber physical test method). Each product has a diameter and mass of about 45mm. A pressure roller stipulated in the inspection standard was used.

1.5 Weight A weight weighing 1 kg was used.

2. Test piece A cloth adhesive tape test piece was prepared by cutting the cloth adhesive tape into a width of 25 mm.

3. Operation After wiping the surface of the test plate with a clean dry gauze, the end of the cloth adhesive tape test piece was attached to one end of the test plate so that air bubbles would not enter along the direction of the center of the test plate. Next, after one reciprocating pressure is applied from the top of the test piece using a pressure roller at a press speed of about 300 mm / min, the test piece is cut at a position of 25 mm in the step direction, and the time determined by each inspection standard I left it alone. Thereafter, the test plate was inserted into the test plate holding portion of the automatic holding force tester, the weight defined in the play portion of the test piece was attached, and the weight was gently suspended so that the weight did not shake. Immediately, the hour meter was turned on to start counting, and the time until the weight dropped was read. If the weight does not fall after the specified time has elapsed, the measurement may be stopped at that point.

4). 4.1 Summary of records When the weight falls The measured value indicates the retention time in minutes. The average value of the measured values of all the test specimens collected according to the inspection standard was used as the corrugated board holding force. The average value was rounded according to JIS Z 8401 (number rounding method) and displayed up to 10 minutes.

4.2 When the weight does not fall The measured value was recorded over the specified time.

(6) Throwability:
Cut the adhesive rubber-based double-sided tape (with separator) slightly wider than the width of the test piece, and fold it back about 20 mm to make one end a grip. Thereafter, the test pieces are bonded to the central portion of the strong adhesive rubber double-sided tape. At this time, care should be taken so that the test piece does not stretch and bubbles do not enter. Next, the test piece is turned upside down and reciprocated at a speed of 300 mm per minute with a crimping apparatus and left for 20 to 40 minutes.

  The gripping part of the strong adhesive rubber-based double-sided tape is fixed to the lower chuck of a tensile tester (Instron type tensile tester), and the folded part of the play of the test piece is fixed to the upper chuck part. Next, the driving switch of the tensile tester is turned on, and the test piece is peeled off at a speed of 300 mm / min so as to be 90 degrees, and the value at that time is recorded. At the time of measurement, confirm that the test piece is thrown and destroyed, and in the case of other cohesive failure, state that fact. That is, the anchorage failure was evaluated as being excellent in anchorability (Evaluation A), and the anchorage failure was determined as being insufficient in anchorage (Evaluation B).

  The crimping device is composed of a bakelite plate driven by a roller and an electric motor, and has a structure in which only the weight of the roller is applied to the test piece when the test piece is crimped. The surface of the roller is about 45 mm in width and about 83 mm in diameter and covered with a rubber layer having a spring hardness of 80 ± 5 Hs and a thickness of about 6 mm as defined in JIS K6253 (Method for testing hardness of vulcanized rubber and thermoplastic rubber). The total outer diameter is about 95 mm) and the mass is 2000 ± 50 g.

[Example 1]
(1) Preparation of substrate:
A polyethylene composition was prepared by melt-kneading 80 parts by weight of calcium carbonate (NS # 100, manufactured by Nitto Flour Chemical Co., Ltd.) with respect to 100 parts by weight of polyethylene (low density polyethylene). The polyethylene composition was melt extrusion coated on one side of a woven fabric in which 30-th staple yarn was driven into a length of 40 pieces / 25 mm and a width of 30 pieces / 25 mm to prepare a base material for a cloth adhesive tape. The thickness of the polyethylene layer was 60 μm. A release agent (long-chain alkyl release agent; manufactured by Nichiban Co., Ltd.) was applied to the back surface of the polyethylene layer so as to be about 0.5 g / m ² after drying and dried. The thickness of the base material was 230 μm.

(2) Preparation of rubber-based hot melt adhesive:
100 parts by weight of tackifier (petroleum resin), 30 parts by weight of oil, 10 parts by weight of filler, and 100 parts by weight of styrene-isoprene-styrene block copolymer (SIS: Califlex TR1107 manufactured by Shell Chemical Co., Ltd.) A rubber-based hot-melt pressure-sensitive adhesive was prepared by melt-kneading 1 part by weight of an anti-aging agent.

(3) Production of adhesive tape:
Water was sprayed uniformly on the surface of the base material on the woven fabric side so as to have a coating amount of 5 ml / m ² . On the surface to which water was applied, the rubber-based hot-melt pressure-sensitive adhesive layer was melt-coated so that the coating amount was 100 g / m ² to prepare a cloth pressure-sensitive adhesive tape. The total thickness of the cloth adhesive tape was 250 μm. Due to the penetration of the woven fabric into the polyethylene layer and the pressure-sensitive adhesive layer, the total thickness is smaller than the total thickness of each layer.

(4) Foaming:
The cloth adhesive tape was heated at 150 ° C. for 5 seconds to evaporate water and expand by gasification in the adhesive layer, thereby foaming the adhesive layer. The results are shown in Table 1.

[Example 2]
Example 1 except that the amount of the rubber-based hot melt adhesive was changed from 100 g / m ² to 125 g / m ² and the total thickness of the cloth adhesive tape before foaming was changed from 250 μm to 270 μm. Operated. The results are shown in Table 1.

[Comparative Example 1]
0.5 parts by weight of a pyrolytic foaming agent (azodicarbonamide) was melt-kneaded with 100 parts by weight of a rubber-based hot-melt pressure-sensitive adhesive. A rubber-based hot-melt pressure-sensitive adhesive containing a pyrolytic foaming agent was melt-coated without spraying water on the surface of the substrate on the woven fabric side. Table 1 shows the amount of adhesive applied and the adhesive properties.

[Comparative Example 2]
A backing layer was formed using polyethylene not blended with calcium carbonate, water was not sprayed on the surface on the woven fabric side, and the amount of adhesive applied and the total thickness before foaming were as shown in Table 1. Except for this, the same operation as in Example 1 was performed. The pressure-sensitive adhesive layer did not foam. The results are shown in Table 1.

[Example 3]
(1) Preparation of substrate:
A base material was produced in the same manner as in Example 1 except that the backing material was formed using polyethylene not containing calcium carbonate.

(2) Second synthetic resin layer:
A polyethylene composition containing 80 parts by weight of calcium carbonate with respect to 100 parts by weight of polyethylene (the same as in Example 1) was melt-coated on the surface of the base material on the woven fabric side, Two synthetic resin layers (polyethylene composition layer) were formed.

(3) Fabric adhesive tape production:
Water was sprayed uniformly on the surface of the second synthetic resin layer of the substrate so as to have a coating amount of 5 ml / m ² . On the surface coated with water, the same rubber-based hot-melt adhesive as used in Example 1 was melt-coated on the surface of the second synthetic resin layer so that the coating amount was 70 g / m ^2. To fabricate a fabric adhesive tape.

(4) Foaming:
The cloth adhesive tape was heated at 150 ° C. for 5 seconds to evaporate water and expand by gasification in the adhesive layer, thereby foaming the adhesive layer. The results are shown in Table 2.

[Example 4]
The same operation as in Example 3 was performed except that the second synthetic resin layer was formed using a polyethylene composition in which 80 parts by weight of calcium carbonate and hydrogenated SBR (HSBR) were blended with respect to 100 parts by weight of polyethylene. . The anchoring property of the pressure-sensitive adhesive layer was improved by blending HSBR. The results are shown in Table 2.

[Comparative Example 3]
The same operation as in Example 3 was performed except that the blending ratio of calcium carbonate with respect to 100 parts by weight of polyethylene was changed from 80 parts by weight to 20 parts by weight. It is presumed that the sprayed water soaked into the yarn of the woven fabric and could not be applied uniformly, but no foaming of the adhesive layer was observed under heating conditions at 150 ° C. for 5 seconds. The results are shown in Table 2.

[Comparative Example 4]
The same operation as in Example 3 was performed except that polyethylene not containing calcium carbonate was used. No foaming of the pressure-sensitive adhesive layer was observed under heating conditions at 150 ° C. for 5 seconds. The results are shown in Table 2.

[Comparative Example 5]
The operation was performed in the same manner as in Example 3 except that 10 parts by weight of HSBR was blended with 100 parts by weight of polyethylene and that polyethylene without blending calcium carbonate was used. No foaming of the pressure-sensitive adhesive layer was observed under heating conditions at 150 ° C. for 5 seconds. The results are shown in Table 2.

[Comparative Example 6]
Using 100 parts by weight of polyethylene, 10 parts by weight of HSBR, using polyethylene not containing calcium carbonate, and using a rubber-based hot-melt adhesive containing a pyrolytic foaming agent (azodicarbonamide) The same operation as in Example 3 was conducted except that chemical foaming was performed. The results are shown in Table 2.

[Comparative Example 7]
The same operation as in Comparative Example 6 was carried out except that polyethylene containing no HSBR was used. The results are shown in Table 2.

  The cloth adhesive tape of the present invention can be used as an adhesive tape for packing such as sealing, packaging, and holding. Moreover, the cloth adhesive tape of this invention can be utilized also as various industrial adhesive tapes.

DESCRIPTION OF SYMBOLS 1 Release agent layer 2 Backing material which consists of synthetic resin layers 3 Woven cloth 4 Foaming hot-melt-type adhesive layer 21 Release agent layer 22 Backing material which consists of 1st synthetic resin layers 23 Woven cloth 24 2nd synthetic resin layer 25 Foaming Hot-melt pressure-sensitive adhesive layer 31 Release agent layer 32 Lining material made of synthetic resin 33 Woven cloth 34 Water-giving layer 35 Hot-melt pressure-sensitive adhesive layer 36 Foamed hot-melt pressure-sensitive adhesive layer

Claims (10)

A cloth adhesive tape provided with a hot melt pressure-sensitive adhesive layer on the woven cloth surface side of a base material having a layer structure in which a synthetic resin layer is disposed as a backing material on one side of the woven cloth,
The synthetic resin layer is a synthetic resin layer formed from a synthetic resin composition containing 30 to 300 parts by weight of a porous filler with respect to 100 parts by weight of the synthetic resin; and
The cloth adhesive tape, wherein the hot-melt adhesive layer is a foamed adhesive layer containing a large number of closed cells formed by volatilization of a volatile substance. A cloth adhesive tape provided with a hot melt pressure-sensitive adhesive layer on the woven cloth surface side of a base material having a layer structure in which a synthetic resin layer is disposed as a backing material on one side of the woven cloth,
A first synthetic resin layer is disposed as a backing material on one side of the woven fabric, and a second synthetic resin layer is provided in contact with the other surface of the woven fabric,
The second synthetic resin layer is a synthetic resin layer formed from a synthetic resin composition containing 30 to 300 parts by weight of a porous filler with respect to 100 parts by weight of the synthetic resin.
The hot melt pressure-sensitive adhesive layer is provided in contact with the second synthetic resin layer; and
The cloth adhesive tape, wherein the hot-melt adhesive layer is a foamed adhesive layer containing a large number of closed cells formed by volatilization of a volatile substance. A cloth adhesive tape provided with a hot melt pressure-sensitive adhesive layer on the woven cloth surface side of a base material having a layer structure in which a synthetic resin layer is disposed as a backing material on one side of the woven cloth,
The synthetic resin layer is formed by forming a coating layer of a coating liquid containing a hydrophilic polymer on the surface of the woven fabric surface side, or the base material is hydrophilic from above the woven fabric surface side. A coating layer of a coating liquid containing a polymer is formed, and
The cloth adhesive tape, wherein the hot-melt adhesive layer is a foamed adhesive layer containing a large number of closed cells formed by volatilization of a volatile substance.   The cloth adhesive tape according to any one of claims 1 to 3, wherein the volatile substance is water. A method for producing a cloth adhesive tape in which a hot melt pressure-sensitive adhesive layer is provided on the woven cloth surface side of a substrate having a layer structure in which a synthetic resin layer is disposed as a backing material on one side of the woven cloth,
A base having a layer structure in which a synthetic resin layer formed from a synthetic resin composition containing 30 to 300 parts by weight of a porous filler with respect to 100 parts by weight of a synthetic resin is disposed as a backing material on one side of the woven fabric. Preparing material 1;
Step 2 of applying a volatile substance to the woven fabric surface side of the substrate;
Step 3 of forming a cloth adhesive tape provided with a hot melt adhesive layer by applying a hot melt adhesive on the woven cloth surface side of the substrate to which a volatile substance is applied;
Step 4 of heating the cloth adhesive tape to volatilize the volatile substance and expand it by gasification in the hot melt adhesive layer to form a large number of closed cells;
The manufacturing method of the cloth adhesive tape containing each process of these. In the step 2, water is applied as a volatile substance at an applied amount of 1 to 20 ml / m ² on the woven fabric surface side of the base material, and in the step 4, the temperature is changed to 0. The manufacturing method of Claim 5 which heats this cloth adhesive tape on the conditions heated for 5 to 10 seconds. A method for producing a cloth adhesive tape in which a hot melt pressure-sensitive adhesive layer is provided on the woven cloth surface side of a substrate having a layer structure in which a synthetic resin layer is disposed as a backing material on one side of the woven cloth,
A first synthetic resin layer is disposed on one side of the woven fabric as a backing material, and in contact with the other surface of the woven fabric, contains 30 to 300 parts by weight of a porous filler with respect to 100 parts by weight of the synthetic resin. Step I of preparing a base material having a layer structure in which a second synthetic resin layer formed from a synthetic resin composition is disposed;
Providing a volatile substance on the surface of the second synthetic resin layer of the substrate II;
Step III of forming a cloth adhesive tape provided with a hot-melt pressure-sensitive adhesive layer by applying a hot-melt pressure-sensitive adhesive on the surface of the second synthetic resin layer provided with the volatile substance; and
Heating the cloth pressure-sensitive adhesive tape to volatilize the volatile substance and expand it by gasification in the hot-melt pressure-sensitive adhesive layer to form a large number of closed cells; IV
The manufacturing method of the cloth adhesive tape containing each process of these. In the step II, water is applied as a volatile substance in an applied amount of 1 to 20 ml / m ² on the surface of the second synthetic resin layer of the substrate, and in the step IV, the temperature is 90 to 180 ° C. The manufacturing method of Claim 7 which heats this cloth adhesive tape on the conditions heated for 0.5 to 10 seconds at temperature. A method for producing a cloth adhesive tape in which a hot melt pressure-sensitive adhesive layer is provided on the woven cloth surface side of a substrate having a layer structure in which a synthetic resin layer is disposed as a backing material on one side of the woven cloth,
A base material using a synthetic resin layer in which a coating solution is formed by applying a coating solution containing a hydrophilic polymer to the surface of the synthetic resin layer on the woven fabric surface side, or hydrophilic from above the woven fabric surface side A step i of preparing a base material on which a coating layer is formed by applying a coating solution containing a polymer;
Applying a volatile substance to the woven fabric surface side of the substrate; ii;
A step iii of forming a cloth adhesive tape provided with a hot melt pressure-sensitive adhesive layer by applying a hot melt pressure-sensitive adhesive on the woven fabric surface side of the substrate to which a volatile substance is applied; and
Heating the cloth adhesive tape to volatilize the volatile material and expand it by gasification in the hot melt adhesive layer to form a large number of closed cells; iv;
The manufacturing method of the cloth adhesive tape containing each process of these. In the step ii, water as a volatile substance is applied to the woven fabric surface side of the base material in an applied amount of 1 to 20 ml / m ² , and in the step iv, a temperature of 90 to 180 ° C. The manufacturing method of Claim 9 which heats this cloth adhesive tape on the conditions heated for 5 to 10 seconds.

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