JPS63120787A - Adhesive tape - Google Patents

Abstract

PURPOSE:To prepare an adhesive tape which is excellent in water resistance, easily tearable by hand, light, and inexpensive, by providing an adhesive layer and a synthetic resin laminate layer on at least one surface of a tape substrate formed by weaving particular warps and wefts. CONSTITUTION:An adhesive tape comprising a substrate for a tape prepd. by weaving warps and wefts and an adhesive layer provided on at least one surface of the substrate, wherein the substrate comprises warps made of polyolefine multifilaments and wefts made of mixed multifilaments contg. a polyolefine monofilament and a monofilament having by at least 10 deg.C higher m.p. than that of the polyolefine monofilament and a synthetic resin laminate layer is provided on at least one surface of the substrate. It is pref. from the viewpoint of water resistance and physical strength that the polyolefin multifilament be a polypropylene multifilament.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is capable of cutting by hand, that is, it is possible to cut the cut end neatly by hand in a substantially straight line without using any particular cutting jig such as scissors, tape cutter, etc. It concerns an adhesive tape that can be cut.

<Prior art and its problems> Conventionally, as an adhesive tape that can be cut by hand, a tape support with directional properties in which the stretching ratio in the length direction of the tape is smaller than the stretching ratio in the width direction has been used. A tape that uses a plastic adhesive tape with an adhesive layer on the body and a base fabric made by extrusion laminating polyolefin resin on the surface of cotton cloth or cloth with appropriate physical strength such as Racon City as the tape support. However, in recent years, tape supports using the above-mentioned base fabric have been widely used.

However, adhesive tapes using the above-mentioned base fabric as a tape support have insufficient water resistance due to the material of the woven fabric constituting the base fabric, and furthermore, because the tape is thick, it is difficult to form rolls. However, when rolled into a long length, it is bulky and heavy, making it difficult to handle.

Therefore, recently, synthetic resin threads such as polyester threads and vinylon threads have been proposed as base fabric materials, but base fabrics using such polyester threads and vinylon threads have poor hand-tearability. If the cutting is insufficient and forced, the threads will become tangled or frayed at the cut end, and the cut end will be linear and beautiful. To this end, we choose thread materials with special chemical compositions,
Attempts have been made to chemically treat the base mold, but such selection and treatment have the disadvantage of making the base fabric expensive.

<Problems to be Solved by the Invention> Therefore, the first object of the present invention is to provide an adhesive tape with good water resistance and hand tearability.

A second object of the present invention is to provide a lightweight and inexpensive cloth adhesive tape.

Means for Solving the Problems> An object of the present invention is to provide an adhesive tape in which warp and weft are bonded to at least one surface of a tape support made of m, The upper warp of the support is a polyolefin multifilament, and the weft is a polyolefin monofilament.
This is achieved by each of the multifilaments mixed with a monofilament having a melting point 0° C. higher and having a synthetic resin laminate layer provided on at least one surface.

According to the adhesive tape of the present invention, the warp is composed of a polyolefin multifilament, the weft is composed of a mixed multifilament containing a monofilament having a melting point at least 10° C. higher than that of the filament, and at least one surface of the fabric is A synthetic resin layer laminated in a high-temperature molten state is provided, and the two are integrally bonded, and the synergistic effect of these makes it possible to provide a lightweight and inexpensive product with good water resistance and hand-cutting properties. It has the characteristic of

Polyolefin multifilaments used as warp yarns in carrying out the present invention include polyethylene,
The density of polypropylene, polybutene-1, etc. is about 0.
91 to about 0.97 olefin homopolymer or ethylene-propylene copolymer or monoolefin dissonant monomer and one or more other olefin dissonant monomers copolymerizable therewith. Consisting of a monofilament made of a copolymer such as a copolymer and having a thickness of 1 to 10 deniers: repellency of 30 to 200 deniers, preferably 40 to 15
Examples include 0 denier multifilament, but polypropylene multifilament is preferred from the viewpoint of water resistance and physical strength.

The mixed multifilament used as the weft is a multifilament composed of high melting point monofilaments (total degree 30 -500 deniers, preferably 50 to 200 deniers), and examples of high melting point monofilaments include polyester monofilaments, polyamide monofilaments (nylon 6.12.66, etc.), polychlorinated monofilaments, etc. Examples include synthetic resin monofilaments such as vinyl monofilament, polyacrylic monofilament, polyvinyl alcohol monofilament, polyvinylidene chloride monofilament, acrylonitrile monofilament, and polypropylene monofilament, as well as rayon, cotton, glass fiber, cellulose, etc., but especially polyester-based monofilaments. Monofilament, polyamide monofilament, and acrylic monofilament are preferred.

The mixed multifilament can be obtained by twisting and twisting a polyolefin multifilament with a low total fineness and a high melting point multifilament with a low total fineness, or by mixing a polyolefin monofilament with a high melting point monofilament and then twisting the mixture. Although it can be obtained by combining a polyolefin resin and a high melting point resin, a multifilament using a monofilament having a core-sheath structure or a concatenated structure may also be used.

The warp and weft constructed in this manner are woven by a conventional method, but the number of weaved warps is 30.
~100 wefts/inch, preferably 35-70 wefts/inch, 30-130 wefts/inch, preferably 35-8
A range of 0 lines/inch is preferable.

The surface of at least one of the woven fabrics thus woven is coated with a layer of 5 to 80 mm thick made of olefin homopolymer or copolymer, or other thermoplastic synthetic resin as described above.
The μ-sized synthetic resin laminate layer is formed by an extrusion lamination method, a melt coating method, or the like.

Therefore, during this lamination, it is preferable that the synthetic resin is in a high temperature molten state.

By bringing the synthetic resin into a high-temperature molten state during lamination in this way, the moment the synthetic resin layer to be laminated and the textile fabric come into contact, the synthetic resin layer is lowered to the softening point of the polyolefin multifilament that makes up the textile fabric. During this time, at least a portion of the polyolefin filaments constituting the warp and weft melt and become a synthetic resin.
-It is something that is integrated with.

In the above, the melting temperature of the synthetic resin during lamination is
In the extrusion lamination method, the melt extrusion temperature is set at a temperature that allows the contact temperature of the laminated synthetic resin layer to melt and integrate with the table 114 portion of the polyolefin filament so as not to impede the physical properties of the high melting point filament. It is necessary to keep it. In order to reliably eliminate the inhibition of the physical properties of high melting point filaments, it is necessary to
, preferably a monofilament having a melting point 20°C higher.

In this way, the tape support formed by providing the synthetic resin tm on at least one surface of the ll1I cloth under the above-mentioned specific conditions has a strength of 50kII1 in the warp direction (lengthwise direction).
50 iLi or less, preferably 10 to 35 kg, 150 parrots, the strength in the weft direction (cm direction) is 15 to 150 IlII or more, preferably 30 to 70 to 9/50101, and in that combination, the strength in the warp direction is equal to the strength in the weft direction. compared to at least IJ150, preferably 3kg1
50B is designed to be weak, and the elongation is 30 in the warp direction.
% or less, preferably 20% or less, the weft direction is 15% or more, preferably 20% or more, and in that combination, the elongation in the warp direction is at least 3%, preferably at least 3%, compared to the elongation in the weft direction. is desirably designed to be 5% smaller, and an adhesive layer is provided on at least one surface of this support to form the adhesive tape of the present invention.

Normally, when manufacturing an adhesive tape using a tape support made of a synthetic resin layer on only one surface of the fabric,
Adhesive JliI is formed on the surface of the S cloth, and the synthetic resin layer is wound into a roll onto a paper tube or the like with or without a back surface treatment layer. When a synthetic resin layer is provided on both sides of the woven fabric, the adhesive layer is formed on one surface and the back treatment layer is formed on the other surface, and the fabric is wound into a roll, or the adhesive layer is formed on one surface. A removable tape or a similar product having a low adhesive function on one or both sides is temporarily attached to one of the tapes to form a roll or sheet.

When forming these back surface treatment layers or adhesive layers, these j! ! 1 and the woven fabric or synthetic resin layer, chemical or physical treatment such as oxidizing their surfaces can be performed, and these treatment methods are disclosed in Japanese Patent Publication No. 39-14098.
It is stated in the No.

The adhesive layer is mainly made of an adhesive material having pressure-sensitive adhesive properties at room temperature, which is made of a copolymer of (meth)acrylic acid nysterte and a polymerizable monomer that can be copolymerized, synthetic rubber and/or natural rubber. Pressure-sensitive adhesives such as bone-bonding substances that have pressure-sensitive adhesive properties at room temperature, and heat-activated adhesives that have no or weak adhesive properties at room temperature and whose main component is a heat-melting resin such as ethylene-vinyl acetate copolymer. An adhesive such as a mold adhesive, a water-based adhesive, or a solvent-activated adhesive is used to form the adhesive to a thickness of usually 5 to 300 μm using a conventional method.

In addition, the back surface treatment/[1] is formed by a conventional method using a low adhesive resin such as a silicone resin, a long chain alkyl resin, or a fluororesin to a thickness of usually 0.1 to 5 μm.

Effect> As described below, the adhesive tape of the present invention uses filaments with a high melting point or apparently no upper melting point as part of the weft, and also uses polyolefin filaments, so it is easy to tear by hand. It has the characteristics that it has good adhesive strength between the textile fabric and the laminate layer, is lightweight and can be provided at low cost.

<Example> Examples of the present invention will be shown below.

Example 1 As the warp, 45 multifilaments made of polypropylene monofilament with a thickness of 3 denier and a total fineness of 50 denier were implanted per inch, and as the weft,
A multifilament made of polypropylene monofilament with a thickness of 3 denier and a wire fiber g of 50 denier, a multifilament made of a polyester monofilament with a thickness of 3 denier with a total fineness of 50 denier, and a mixed multifilament made by T-twisting 40 pieces/ A polypropylene/polyester blend fabric made by inserting inches was prepared.

Next, one surface of the fabric was coated with a melt index of 25.
Polypropylene with a density of 0.91 was melt extruded at a temperature of 310°C.
A tape support was obtained by extrusion lamination to provide a polypropylene layer with a thickness of 35 μm.

A long-chain alkyl-based back treatment agent is coated on the polypropylene 21 side of the tape support and dried to form a back treatment with a thickness of 0.5 μm, and a texture mainly composed of natural rubber is applied to the other fabric side. Pressure adhesive mtl - formed with a thickness of about 80 μm to obtain the adhesive tape of the present invention.

The strength and elongation of this tape in the warp direction (length direction) are 2
At 9 kg/50 mtx and 20%, the strength and elongation in the weft direction (hoop direction) are 45X//50 mx and 32
%, it had sufficient practical strength and the hand tearability in the weft direction was as good as or better than conventional heavy adhesive tapes using cotton cloth or rayon cloth.

In addition, the cut end is beautiful and there are no kinks or fraying of the threads.
When the cut sheet was observed under a microscope, it was found that the warp threads were uniformly melted and integrated at the interface with the polypropylene layer, and the weft threads were a mixture of polypropylene filaments and polyester filaments.

Example 2 As the weft, 60 polyethylene multifilaments with a total fineness of 50 denier were implanted per inch, and as the weft,
A city was made of a polyethylene/nylon 66 blend made by driving 40 pieces/inch of mixed multifilaments of nylon 66 multifilament with a total fineness of 50 denier and polyethylene multifilament with a total fineness of 50 denier.

Next, melt index 21,
A tape support was obtained by extrusion laminating polyethylene having a density of 0.96 at a melt extrusion temperature of 280 DEG C. to provide a polyethylene l-layer having a thickness of 50 .mu.m.

A silicone backing agent is applied to the polyethylene layer surface of the tape support and dried to form a full silicone layer with a thickness of 0.3 μm, and an acrylic pressure sensitive adhesive/1t-60 μm thick is applied to the other fabric surface. An adhesive tape of the present invention was obtained.

The strength and elongation of this tape in the warp direction are 26 to 9150
At 20%, the strength and elongation in the weft direction are 38 to 9/
It was 50 ytm and 35%, and had good hand tearability.

In addition, the cut edges were beautiful as in Example 1, and the interface portions of the warp threads were uniformly melted and integrated with the polyethylene layer.

Example 3 As the warp, 46 filaments of polypropylene multi (24 filaments) with a total fineness of 75 deniers were implanted, and as the weft, a sea-score type monofilament consisting of a polyester monofilament core and a polypropylene sheath was used. Multi (100 denier)
A polypropylene/polypropylene/polyester blend woven fabric was prepared by implanting 40 filaments/inch (36 filaments).

Next, melt index 21,
Polypropylene with a density of 0.92 was melt extruded at a temperature of 305°C.
extrusion laminated with a thickness of 45 μf11 on one surface.
．． Polypropylene J with a thickness of 20 μm is placed on the surface of the fl1g side.
! I was provided, respectively, to obtain a tape support.

A long-chain furkyl backing agent was applied to the polypropylene layer (45 μm) of the tape support and dried to a thickness of 0.08 μm.
A conventional back treatment 114 was formed, and an acrylic pressure-sensitive adhesive layer was formed on the other polypropylene layer (20 μm thick) to a thickness of about 60 μm to obtain an adhesive tape of the present invention.

This tape had excellent adhesion between the fabric and the laminate l-, and the tape had less initial resistance than Examples 1 and 2, and could be cut with a small amount of force.

In addition, the cut edges had no kinks or fraying, and in each case, the interface portion was integrated with the polypropylene layer by bath melting.

Claims (1)

[Scope of Claims] 1) An adhesive tape comprising an adhesive layer provided on at least one surface of a tape support formed by weaving warps and wefts, wherein the warp is a polyolefin multifilament, An adhesive tape in which the wefts are each composed of a mixed multifilament containing a polyolefin monofilament and a monofilament having a melting point at least 10° C. higher than that of the filament, and a synthetic resin laminate layer is provided on at least one surface. 2) The adhesive tape according to claim 1, wherein the polyolefin multifilament is a polypropylene multifilament. 3) The adhesive tape according to claim 1, wherein the monofilament having a melting point higher by at least 10° C. is at least one selected from the group consisting of polyester monofilament, polyamide monofilament, and acrylic monofilament.