JPH05247422A - Adhesive tape - Google Patents

Abstract

(57) [Summary] [Object] To provide a pressure-sensitive adhesive tape in which the heat resistance of a base material in which a film is heat-sealed to a woven fabric is improved, and the productivity when dried after applying the pressure-sensitive adhesive is improved. A pressure-sensitive adhesive tape comprising a base material obtained by heat-sealing a polyethylene film on a woven fabric having polyethylene fibers as warps and wefts, wherein the polyethylene film is cross-linked after heat-sealing. Adhesive tape to do.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-sensitive adhesive tape using a base material in which a woven fabric and a film are heat-sealed. More specifically, the heat resistance of the base material is increased and high-temperature drying after the pressure-sensitive adhesive is applied is possible. And relates to an adhesive tape having improved productivity.

[0002]

2. Description of the Related Art Adhesive tapes using a woven fabric in which thermoplastic synthetic fibers are arranged in warp and weft, and an extrusion laminate layer of a polyolefin resin being heat-sealed as a base material are known.

For example, in Japanese Examined Patent Publication No. 19718/1989, one side of a base fabric using warp and weft yarns made of a flat yarn of a thermoplastic resin is subjected to extrusion laminating of a first layer with the thermoplastic resin, and further thereon. Adhesive tape with the second layer extruded and laminated, the first laminated layer intruding into the gap between the warp and weft threads of the base fabric to fix the warp and weft insertion state, and the adhesive on the other side. Is proposed.

In Japanese Patent Publication No. 1-41189, a woven cloth made of a flat yarn of a thermoplastic resin is used as a tape base cloth, and layers on which synthetic resin is extruded and laminated are provided on both front and back surfaces of the base cloth. An adhesive tape having a structure in which a pressure-sensitive adhesive layer is attached has been proposed.

In Japanese Patent Publication No. 3-49951, a polyolefin film is thermocompression-bonded to a woven fabric in which a polyolefin filament yarn is arranged in a warp and a thermoplastic synthetic fiber filament yarn having a higher melting point than the warp is arranged in a weft. And a part of the warp filament yarn is thermally deteriorated, the base material for an adhesive tape is disclosed.

Adhesive tapes based on these woven fabrics provided with a laminate layer have good hand tearability and water resistance. However, in the prior art, the melting point of the polyolefin film to be heat-sealed is low, for example, in the case of polyethylene film, which is around 120 ° C., in the process of applying an adhesive to these substrates and drying, Cannot be dried at high speed. In particular, when the solvent-based pressure-sensitive adhesive is directly applied on the base material and dried, the productivity must be lowered.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a pressure-sensitive adhesive tape which has improved heat resistance of a base material in which a film is heat-sealed on a woven fabric and which has improved productivity after drying the pressure-sensitive adhesive. To provide. As a result of earnest research, the present inventors have found that
By using a base material in which a polyethylene film is heat-sealed to a woven fabric in which polyethylene fibers are arranged in the background, and by cross-linking the heat-sealed polyethylene film, it has been found that the above object can be achieved, and the present invention is based on the findings. Has been completed.

[0008]

According to the present invention, there is provided a pressure-sensitive adhesive tape comprising a base material obtained by heat-sealing a polyethylene film on a woven fabric having polyethylene fibers as warp and weft yarns, the pressure-sensitive adhesive layer being provided on the base material. There is provided an adhesive tape characterized in that the film is cross-linked after heat-sealing.

The present invention will be described in detail below. In the present invention, as the polyethylene fibers used as the warp and weft, filament yarn, flat yarn, etc. can be used. It is generally preferable that the woven fabric used in the present invention is a plain weave, and it is preferable that the warp yarn has a lower denier than the weft yarn to enhance the hand-cutting property in the transverse direction. For example, when polyethylene flat yarn is used for the warp and weft, if the warp is 50 to 150 denier and the number of threads is 30 to 60, and the weft is 200 to 400 denier and the number of threads is about 12 to 25, the transverse direction The hand-cutability of is good.

A polyethylene film is heat-sealed to the woven fabric. Usually, the polyethylene film is heat-sealed on one side of the woven fabric, but both sides may be heat-sealed if desired. The polyethylene film is usually laminated on the woven fabric by extrusion lamination of polyethylene resin and heat-sealed.

Examples of polyethylene include ethylene homopolymers, ethylene-α-olefin copolymers, ethylene-vinyl acetate copolymers, ethylene-acrylic acid copolymers, ethylene-acrylic acid ester copolymers, ethylene-vinyl chloride copolymers. Various polyethylene-based resins such as polymer and ethylene-propylene copolymer can be used. In addition, a silane-grafted modified polyethylene-based resin can be used to form a crosslinked polyethylene film.

In the present invention, after the polyethylene film is heat-sealed to the woven fabric, the polyethylene film is crosslinked. As a cross-linking method, irradiation cross-linking using an ionizing radiation such as an electron beam, chemical cross-linking using a peroxide, and water cross-linking using a silane-grafted modified polyethylene can be adopted according to a conventional method.

The pressure-sensitive adhesive used in the present invention is not particularly limited, and natural rubber, synthetic rubber, acrylic resin, hot melt pressure-sensitive adhesive or the like can be used. Specific examples of the base polymer of the adhesive include natural rubber, isoprene rubber, styrene-butadiene copolymer rubber (SBR), butadiene rubber, styrene-isoprene rubber, acrylic rubber, acrylonitrile-butadiene copolymer rubber, styrene- Isoprene / block copolymer rubber (SIS), styrene-
Examples thereof include butadiene / block copolymer rubber (SBS), chloroprene rubber, butyl rubber, recycled rubber, and the like, and mixtures thereof.

In addition to the base polymer, a tackifier resin, a filler, a softening agent, an antiaging agent or the like which is commonly used can be added to the tackifier, if necessary.

[0015]

EXAMPLES The present invention will be described more specifically below with reference to examples and comparative examples, but the present invention is not limited to these examples.

[Example 1] 90 denier warp, 320
A woven fabric (plain weave: 46 warps / inch, 16 wefts / inch) made of polyethylene flat yarn made of denier weft was laminated with polyethylene having a molding temperature of 300 ° C. to a thickness of 25 μm and cooled. The obtained base material was irradiated with an electron beam (200 keV, 10 Mrad) to obtain a base material for an adhesive tape. After applying a solvent-type natural rubber-based pressure-sensitive adhesive (concentration 45% by weight, viscosity 30000 cps) to the obtained base material (application amount 150 g / m ² wet, drying oven length 10 m), three types as shown in Table 1 were obtained. The drying test was performed under the conditions of. The results are shown in Table 1.

[Example 2] A woven fabric made of polyethylene flat yarn composed of the same warp yarn of 90 denier and weft yarn of 320 denier as in Example 1 was added to a silane-grafted modified polyethylene at a molding temperature of 300 ° C (based on 100 parts by weight of polyethylene). , 2 parts by weight of vinyltrimethoxysilane, 0.15 parts by weight of dicumyl peroxide as an initiator, and 0.5 parts by weight of dibutyltin laurate were kneaded and extruded at 200 ° C. and pelletized), and then laminated at a heat of 25 μm. The adhesive tape base material was obtained by curing and crosslinking for 1 week in an environment of temperature 23 ° C. and relative humidity 65%. Using this base material, an adhesive tape was obtained in the same manner as in Example 1 and evaluated in the same manner. The results are shown in Table 1.

Comparative Example 1 A woven fabric made of polyethylene flat yarn made of the same 90 denier warp and 320 denier weft as in Example 1 was laminated with polyethylene at a molding temperature of 300 ° C. to a thickness of 25 μm and cooled. A base material for an adhesive tape was obtained. Using this base material, an adhesive tape was obtained in the same manner as in Example 1 and evaluated in the same manner. The results are shown in Table 1.
Shown in.

[0019]

[Table 1]

As is clear from Table 1, in Examples 1 and 2, the curl of the base material at the time of high temperature and high speed drying seen in Comparative Example 1 did not occur, and the productivity at the time of coating and drying the adhesive was improved. You can see that

[0021]

According to the present invention, the heat resistance of the substrate is increased,
It is possible to obtain a pressure-sensitive adhesive tape with improved productivity after drying after the pressure-sensitive adhesive is applied. Further, it is possible to reduce the deformation (bowl-like shape) due to the reduction of the residual stress during processing and the seepage of the adhesive. Furthermore, the range of use can be expanded to applications requiring heat resistance.

Claims (1)

[Claims] 1. A pressure-sensitive adhesive tape comprising a base material obtained by heat-sealing a polyethylene film on a woven fabric having polyethylene fibers as warps and wefts, wherein the polyethylene film is cross-linked after heat-sealing. Characteristic adhesive tape.