JPH1030076A - Bouble-sided adhesive sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a means for simply applying seal processing at a low cost to a sheet with an image having arbitrary size including a huge size. SOLUTION: This double-sided adhesive sheet is prepared by laminating a tacky agent and heat-bonding resin onto a separator in this order. Two sheets are stuck on a smooth plane so that laminated face of heat-bonding resin of the double-sided adhesive sheet is brought into contact with the sheet with an image. Operation for pressing heat roller, etc., is carried out. Thereby, the heat-bonding resin develops adhesiveness and the sheet with the image is firmly bonded to double-sided adhesive sheet without forming air accumulation and crease to complete a seal with the image.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided adhesive sheet used in the fields of signage, advertisement, interior decoration and the like.

[0002]

2. Description of the Related Art Conventionally, a sheet with an image manufactured using a photographic technique, a printing technique, a printer output technique, or the like is subjected to an adhesive processing (seal processing) so that it can be bonded to any other object.
That is being done. The double-sided adhesive sheet used at this time is obtained by laminating a pressure-sensitive adhesive on a separator called a double-sided separator on which the back surface is also subjected to releasability processing and winding it up in a roll shape. Then, the sheet with the image wound up in a roll shape is set on a roller at the rotation of the laminator, and then the two sheets are sandwiched between two other pressure rollers to release air. The sealing operation is performed while widening the sheet to both ends of the roller so as not to cause wrinkles.

[0003]

Since the above method requires a roller-type laminator, it requires a considerable amount of lead portions in front and back of both sheets, including the amount required for the adjustment operation. It is very disadvantageous in terms of cost when sealing a type film. Also, since the processing width is limited by the width of the laminator roller, it is not possible to cope with a sheet with a larger image, and even if it is a large sheet with an image, it must be cut to the roller width. Absent. In addition, the wider the film is, the more likely it is that air traps and wrinkles are likely to occur, and the work often fails. Therefore, an object of the present invention is to provide a means for easily and inexpensively sealing a sheet with an image of any size.

[0004]

As a result of intensive studies, the present inventor has found that the adhesiveness of the surface of the pressure-sensitive adhesive layer which is not in contact with the separator of the double-sided adhesive sheet is closed in a storage state, and is closed at the time of the sealing operation. If it is possible to develop a certain adhesiveness, no matter what kind of large-area, wide-width image-attached sheet does not stick to the double-sided adhesive sheet until just before the sealing work, it allows air to escape, and I came to realize that the sealing work performed while extending the sheet can be easily performed by various means including manual work. In addition, the inventors have found that a heat-adhesive resin may be further laminated on the pressure-sensitive adhesive layer in order to seal and develop the adhesive property, and the present invention has been achieved.

[0005]

The pressure-sensitive adhesive used in the present invention is not particularly limited, and any pressure-sensitive adhesive such as an acrylic resin, a synthetic rubber, or a natural rubber may be selected according to the intended use. As the heat-adhesive resin, among thermoplastic resins which become adhesive at a relatively low temperature of 90 to 130 ° C., when it has good adhesiveness with the adhesive on which it is laminated, and when it becomes heat-adhesive What is necessary is just to select what has good adhesiveness with the film which becomes a bonding partner. As these heat-adhesive resins, for example, polyvinyl acetate copolymer, polyvinyl alcohol, polyvinyl chloride, polyvinyl formal, polyvinyl butyral, acrylic resin, ethylene-vinyl acetate copolymer,
Ethylene-vinyl alcohol copolymer, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer, vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl acetate-maleic anhydride copolymer, polyvinyl ether, polyester Resin-based materials, cellulose derivatives and the like can be mentioned.

As the heat-adhesive resin, in addition to the above-mentioned hot-melt type which immediately loses its adhesiveness when cooled, a room-temperature non-tacky adhesive which maintains the heat-adhesiveness for a considerable time may be used. . This adhesive does not show adhesiveness at room temperature, but is activated by heating and exhibits adhesiveness similar to that of a normal adhesive for several tens of minutes to several hours, and is called a delayed-tack type adhesive. This means that when using the thermo-adhesive resin, a relatively severe heating temperature range required, a heating duration time, and no pressure conditions are required at all, and only heating at an instantaneous activation temperature or higher is sufficient. Moreover, it is very convenient because it has adhesiveness to almost all films as a pressure-sensitive adhesive.

[0007] These room temperature non-tacky adhesives include:
Thermoplastic resins such as ethylene-vinyl acetate copolymers, ionomers, polyamides, polyesters, polyacryls, polyurethanes, etc., as required, hydrocarbon-based, rosin-based, ester-rosin-based, xylene-based, terpene-based, phenol-based, and terpene-based -A blend of a phenol-based tackifier and a blend of a styrene-butadiene block copolymer and a tackifier such as a coumarone resin, a styrene resin, a xylene resin, and a phenol-modified resin can be used. It is desirable to adjust the softening point of these resins to about 90 ° C. or higher so that the resin does not have tackiness at room temperature.

In the above case, the blending ratio is 100 parts by weight or less with respect to 100 parts by weight of the thermoplastic resin. In the above case, the styrene-butadiene block copolymer 1 is used.
It is desirable that the amount be 10 to 60 parts by weight based on 00 parts by weight. If the ratio is outside the above range, the tackiness at room temperature becomes a problem. To improve non-stickiness at room temperature,
Anti-blocking agent such as wax and fatty acid amide
It can be added in a range of 0 parts by weight or less.

[0009] By laminating a thermo-adhesive resin further on the pressure-sensitive adhesive layer of the double-sided adhesive sheet in which the pressure-sensitive adhesive is laminated on the separator, only the surface of the pressure-sensitive adhesive is blocked. The sheet can be easily handled like a normal sheet. For example, the heat-adhesive resin laminated surface of the double-sided adhesive sheet is placed on a smooth flat surface where the work is performed so that the laminated surface of the double-sided adhesive sheet is in contact with the sheet with the image, and the heat-adhesive resin is bonded by spreading it with a hot roller. Expressing properties, only the working part of the sheet with the image and the double-sided adhesive sheet adheres firmly. By sequentially expanding the work area, a large area image-attached sheet can be sealed without generating air pockets and wrinkles.

[0010] There is also a thermal lamination device called a heat vacuum applicator. In this device, the sheets to be bonded are placed on a stationary table in a closed space, and the whole is covered with a thin heat-resistant silicon rubber sheet.The gap between the stationary table and the silicon rubber sheet is vacuum-pumped. While decompressing the silicone rubber sheet 20
Heating is uniformly performed by a large number of infrared lamps arranged on the ceiling of about 30 cm above, and thermal lamination of two sheets is performed. When this device is used in the present invention, instead of utilizing the property that a film such as polyvinyl chloride is softened by heat and has adhesiveness, the laminated heat-adhesive resin is activated by heat. It is obvious that the present apparatus can be preferably used because only the difference is that the property of having adhesiveness is used.

The double-sided adhesive sheet of the present invention can be easily implemented, since it is only necessary to further laminate a heat-adhesive resin on the surface of the commercially available double-sided adhesive sheet on which the pressure-sensitive adhesive is laminated. For example, a method of extruding this resin directly into a film on a commercially available double-sided adhesive sheet, or extruding this resin once on a separator of an intermediate medium, and laminating using a blade coater, a roll coater, a knife coater, etc., Then, a method of laminating using a normal double-sided adhesive sheet and a laminator and then peeling off the separator of the intermediate medium may be adopted. The thickness of the laminate is arbitrary, but is, for example, about 5 to 30 microns as long as the tackiness of the pressure-sensitive adhesive surface having a relatively rough surface can be uniformly blocked.

[0012]

【Example】

Example 1 A saturated polyester resin-based hot melt adhesive Chemit R-99 (trade name, manufactured by Toray Industries, Inc.) was applied to a double-sided adhesive sheet No. 1 on the adhesive layer of 777 (Teraoka Seisakusho)
It was laminated to a thickness of 5 microns. This double-sided adhesive sheet and a sheet with an image made of a polyvinyl chloride film having a thickness of 80 microns are overlapped so that R-99 is in contact with the polyvinyl chloride film, and set on the heat vacuum applicator (manufactured by SignTec, USA). The temperature was kept at 120 ° C. for 1 minute while reducing the pressure with a vacuum pump. As a result, a seal with an image without air pockets and wrinkles was obtained over the entire film.

Example 2 An emulsion-type room-temperature non-tacky pressure-sensitive adhesive, Heatmagic DW-1030 (trade name, manufactured by Toyo Ink Co., Ltd.) was prepared using the double-sided adhesive sheet No. 7
It was laminated to a thickness of 20 microns on the adhesive layer of No. 77. This double-sided adhesive sheet and the above-mentioned sheet with an image made of a polyvinyl chloride film having a thickness of 80 μm are overlapped so that the adhesive lamination surface is in contact with the polyvinyl chloride film, and the heat vacuum applicator is set. While maintaining the temperature at 110 ° C. for 1 minute. As a result, a seal with an image without air pockets and wrinkles was obtained over the entire film.

[0014]

As a result of the present invention, using a handy heat roller or an existing heat vacuum applicator such as a 3m x 5m size, a sheet with an image of an arbitrary size including a huge size can be easily and easily formed. Sealing can be performed at low cost.

Claims (2)

[Claims] 1. A double-sided adhesive sheet comprising a pressure-sensitive adhesive and a heat-adhesive resin laminated on a separator in this order. 2. A double-sided adhesive sheet obtained by laminating an adhesive and a room-temperature non-adhesive adhesive in this order on a separator.