JPH0827441A - Production of double-sided tacky tape - Google Patents

Abstract

PURPOSE:To provide a method for producing a double-sided tacky tape by using a releasing film comprising a simple readily moldable and processable polyolefin-based resin having chemical interness without requiring a low- molecular weight mold release agent, etc., and having a difference in peel strength between both front and back surfaces of the polyolefin-based resin film. CONSTITUTION:This method for producing a double-sided tacky tape is to change cooling conditions of both front and back surfaces of an extruded film located in the extrusion from a molten state to a position of a front line where the film is solidified, mainly the temperature difference between the front and back surfaces and air flow rates, changing the crystallization of both the front and the back surfaces of the film, in forming a releasing film having a difference in adhesion between the front and the back surfaces by thermally melting a polyolefin-based resin in an extruder, extruding the melt through a circular die or a flat die into a filmy shape, cooling the resultant extrudate and, to laminate the double-sided tacky tape onto one surface of the releasing film and roll the laminated film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a peeling film manufacturing method and a double-sided adhesive tape.

[0002]

2. Description of the Related Art Conventionally, a peeling film used for an adhesive tape is disclosed in, for example, Japanese Patent Publication No. 57-52389 and Japanese Patent Publication No. 2-13464, and one or both sides of a plastic film having a Young's modulus larger than that of polyolefin. In which a release agent layer of polyolefin is provided.

However, the polyolefin that constitutes the release agent layer requires, for example, a Japanese paper base material having a basis weight of 12 g / m ² or a base material made of a plastic film having a Young's modulus higher than that of the polyolefin. In addition, the polyolefin constituting the release agent layer is to be partially peeled off by the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape to reduce the pressure-sensitive adhesive force or adhesive force of the pressure-sensitive adhesive layer. In order to produce a release film using, the substrate film must be produced, and then a release agent layer must be provided on the film surface by means of other means, which complicates the production process and results in However, there are problems such as high cost.

[0004]

DISCLOSURE OF THE INVENTION The present inventor pays attention to the chemical inertness of a polyolefin resin and the ease of molding, and is composed of a polyolefin resin film alone and a release agent consisting of the above low molecular weight polyolefin. And the like, and by providing a difference in the peeling force between the front and back surfaces of the polyolefin-based resin film, earnestly studied on the film forming technology suitable as a peeling film for double-sided adhesive tape, the present invention It was completed.

[0005]

According to the present invention, a polyolefin resin is heated and melted by an extruder and extruded into a cylindrical shape by a circular die, and a cooling air from the outside of the cylindrical film is used. A film was formed by changing the cooling conditions of the inner and outer surfaces of the tubular film from the molten state to the position of the frost line where the tubular film to be extruded is solidified by providing a temperature difference with the pressurized gas from the inside. A gist of the present invention is a method for producing a double-sided pressure-sensitive adhesive tape, which is characterized in that a double-sided pressure-sensitive adhesive tape is attached to one surface of a release film and wound.

According to a second aspect of the present invention, a polyolefin resin is heated and melted by an extruder and extruded into a film shape by a flat die, and a temperature at which one surface of the film is brought into contact with a cooling roll to be cooled, A temperature difference is provided between the film and the gas temperature of an air knife that presses the film against the cooling roll from the opposite surface, and the cooling conditions for the front and back surfaces of the film are changed from the molten state to the position of the frost line where the film is solidified. A double-sided pressure-sensitive adhesive tape is attached to one surface of a peeling film formed by the above method, and the double-sided pressure-sensitive adhesive tape is wound.

As the above-mentioned polyolefin resin used in the present invention according to claims 1 and 2, a film having a tensile strength at the initial stage of elongation larger than the peeling force between the double-sided adhesive tape and the peeling film is produced. Any kind of material may be used as long as it is obtainable, but linear low density polyethylene (LLDPE), medium density polyethylene, high density polyethylene, polypropylene and the like are preferably used. The above polyolefin-based resins may be used alone, or may be used by mixing two or more kinds thereof, and a polymer alloy in which an elastomer is blended with these polyolefin-based resins and an olefin component are mainly used. A so-called reactor blend product, in which a monomer such as an α-olefin or an acrylic ester forming an elastomer is alloyed in a reactor during polymerization, can be appropriately selected and used according to the application of the double-sided adhesive tape of the product.

In the present invention as set forth in claim 1, the polyolefin resin is heated and melted by an extruder, extruded into a cylindrical shape by a circular die, and transferred while being pinched by pinch rolls and wound up. Inside the tubular film between the pinch rolls, air at a constant temperature is circulated while maintaining a constant pressure so that a predetermined blow-up ratio is maintained from the pipe penetrating the circular die, and the outer periphery of the tubular film. From the above, air cooled to a constant temperature is blown from the air ring, and the difference in temperature between the inside and outside of the tubular film is set to about 20 to 50 ° C. at the position of the frost line where the tubular film is solidified from the molten state. is there.

As described above, from the outer periphery of the tubular film, air cooled to a constant temperature is blown from the air ring, and at the position of the frost line where the tubular film is solidified from the molten state, the inside and the outside of the tubular film. Temperature difference 20 to 50 ℃
By providing a certain degree, the inner and outer surfaces of the obtained tubular film cause a slight difference in the crystallization of the above polyolefin resin, and films having different surface smoothness can be obtained. The film thus obtained shows a difference in the adhesive strength of the double-sided pressure-sensitive adhesive tape to the pressure-sensitive adhesive. The amount of air blown from the outer periphery of the tubular film from the air ring is generally more effective than the case of manufacturing a packaging film, agricultural heat insulating film, or the like, and it is more effective, while considering formability. Select and use as much air as possible.

The present invention according to claim 1 is a double-sided adhesive tape in which a tubular film of a polyolefin resin produced as described above is cut open to form a release film, and a double-sided adhesive tape is attached to one surface of the film and wound. The more rough surface side of the peeling film, that is, the outer surface of the tubular film is outside and the outer surface of the double-sided pressure-sensitive adhesive tape is laminated and laminated, and the both surfaces are wound. If an adhesive tape is produced, it can be unwound and unrolled very smoothly when the obtained double-sided adhesive tape is used, and one side is attached to the object due to the chemical inertness of the polyolefin resin. The peeling film can be easily peeled from the double-sided adhesive tape.

In the present invention as set forth in claim 2, the polyolefin resin is melted by heating with an extruder, extruded into a film with a flat die, brought into contact with the surface of a cooling roll, transported, and wound up. To the contact position of the film contacting the cooling roll surface from the opposite surface contacting the cooling roll surface of the film, blow air from the air knife, at the position of the frost line where the extruded film solidifies from the molten state, The temperature difference between the front and back of the film is set to about 20 to 50 ° C. Generally, the amount of air blown from the outside of the film by the air knife is more effective than the case of manufacturing a packaging film or an agricultural heat insulating film, etc. Select and use the air amount of.

According to a second aspect of the present invention, the polyolefin resin film produced as described above is used as a peeling film, a double-sided adhesive tape is attached to one surface of the film, and the double-sided adhesive tape is wound to produce a double-sided adhesive tape. However, the more rough surface side of the peeling film, that is, the surface blown with air from the air knife is placed outside and laminated on the outer surface of the double-sided pressure-sensitive adhesive tape, and wound to produce a double-sided pressure-sensitive adhesive tape. Then, like the present invention according to claim 1, when the obtained double-sided pressure-sensitive adhesive tape is used, it can be rewound and unfolded very smoothly, and due to the chemical inertness of the polyolefin resin, The peeling film can be easily peeled from the double-sided pressure-sensitive adhesive tape having one surface attached to the object.

[0013]

The method for producing a double-sided pressure-sensitive adhesive tape of the present invention according to claim 1 is a method in which a polyolefin resin is heated and melted by an extruder,
Extruded into a tubular shape with a circular die, a temperature difference is provided between the cooling air from the outside of the tubular film and the pressurized gas from the inside, and the amount of air discharged from the air ring is more than that of general film forming conditions. In many cases, a double-sided adhesive tape is attached to one surface of a release film formed by changing the cooling conditions of the inner and outer surfaces of the extruded tubular film from the molten state to the position of the frost line where it solidifies. , Because it is a wound one, in the manufacturing process of the release film used, by changing the cooling conditions of the inner and outer surfaces of the release film as described above, there are subtle differences in the crystallization of the polyolefin resin used. A film having different smoothnesses on both surfaces is obtained, which is superposed on the rougher surface side of the peeling film, that is, with the outer surface of the tubular film facing outside, on the outer surface of the double-sided adhesive tape. Since the double-sided pressure-sensitive adhesive tape is manufactured by laminating and laminating it by using a double-sided pressure-sensitive adhesive tape, the double-sided pressure-sensitive adhesive tape can be rewound and spread very smoothly when used, and the chemical inertness of the polyolefin resin Thus, the peeling film can be easily peeled from the double-sided pressure-sensitive adhesive tape having one surface attached to the object.

In the method for producing a double-sided pressure-sensitive adhesive tape according to the present invention, the polyolefin resin is heated and melted by an extruder and extruded into a film by a flat die, and one surface of the film is brought into contact with a cooling roll. While cooling, a temperature difference is provided between the surface temperature of the cooling roll at that time and the temperature of the gas discharged from the air knife that presses the film against the cooling roll from the opposite surface, and is further sprayed from the outside of the film from the air knife. The amount of air is generally changed by changing the cooling conditions of the front and back surfaces of the film to the position of the frost line at which the film extruded with a larger amount of air than in the case of manufacturing a packaging film or a heat insulating film for agriculture is solidified. Since the double-sided adhesive tape is attached to one surface of the peeling film formed by In the process, by changing the inner and outer cooling conditions of the peeling film as described above, a subtle difference is given to the crystallization of the polyolefin resin used, and films having different smoothness on both surfaces are obtained. It is obtained because the double-sided pressure-sensitive adhesive tape is manufactured by laminating the film on the rougher surface side, that is, with the outer surface of the tubular film facing outward, and superposing it on the outer surface of the double-sided pressure-sensitive adhesive tape. Rewinds very smoothly when using double-sided adhesive tape,
It can be developed, and due to the chemical inertness of the polyolefin resin, the peeling film can be easily peeled from the double-sided pressure-sensitive adhesive tape having one surface stuck to the object.

[0015]

EXAMPLES Examples of the present invention will be specifically described below.
In the examples, each test of residual adhesive force, spreadability, and peeling force was measured and evaluated by the methods shown below.

1. Residual adhesive force The residual adhesive force was measured according to JIS Z0237 by measuring two items, SP adhesive force and ball tack.

2. Spreadability The double-sided pressure-sensitive adhesive tape was fed out together with the peeling film at a speed of 30 m / min, and the spread state was visually observed, and evaluated in three grades of good, slightly bad, and bad.

3. Peeling strength The other pressure-sensitive adhesive layer of the double-sided pressure-sensitive adhesive tape with the peeling film on one side is fixed to a Bakelite plate with a width of 50 mm, and the peeling film is pulled in the 180 ° direction at a speed of 300 mm / min, and the peeling strength is measured. To do.

(Example 1 = Invention of Claim 1) Polyester
Tylene resin (Mitsui Petrochemical Co., Ltd., trade name: Ultzek
3520L, density: 0.935g / cm³) 80 weight
Part, ethylene-α-olefin copolymer (Mitsui Petrochemical
Company name, product name: Toughmer P-0280, density: 0.87
g / cm ³) Mix 20 parts by weight with a blender and
Using a 90 mmφ extruder,
-Up ratio of 1.3, mold temperature of 210 ℃, thickness 1
Take-up speed of a film with a diameter of 00 μm and a folding diameter of 1,200 mm
At 55 m / min, for a tubular film between the die and pinch roll
The temperature of the enclosed air is kept at 60 ° C.
Cooling air of 23 ° C from the outside air ring of 100 m³/
Minutes were sprayed and cooled to form a tubular film.

The double-sided adhesive tape was prepared by mixing 100 parts by weight of SK Dyne 701 (manufactured by Soken Chemical Industry Co., Ltd.) and 1 part by weight of Coronate L-55 (manufactured by Nippon Polyurethane Co.) as an adhesive.
Apply and dry to a thickness of 60 μm after drying,
A non-woven fabric (manufactured by Nankoku Pulp Co., Ltd., trade name: SPC13) laminated on both sides is used as a peeling film, and is temporarily adhered to the opposite side cooled by blowing cooling air from the air ring of the film to form a roll. It was rolled up and manufactured.
The performance of the obtained double-sided pressure-sensitive adhesive tape is shown in Table 1.

(Example 2 = Invention according to claim 1) A polyethylene resin (manufactured by Mitsui Petrochemical Co., Ltd., trade name: Ultzex 3520L, density: 0.935 g / cm ³ ) was used by an inflation method using a 90 mmφ extruder. Then, set the blow-up ratio to 1.3 and the mold temperature to 210 ° C, and set the thickness to 1
A film with a diameter of 00 μm and a folding diameter of 1,200 mm was taken at a take-up speed of 55 m / min, the temperature of the air enclosed in the tubular film between the mold and the pinch roll was maintained at 60 ° C., and the air ring on the outside of the tubular film was used. Cooling air at 23 ℃ is 100m ³ /
Minutes were sprayed and cooled to form a tubular film.

The double-sided pressure-sensitive adhesive tape was rolled in the same manner as in Example 1 by using the above-mentioned film as a peeling film and blowing the cooling air from the air ring of the film to temporarily attach the opposite surface to the double-sided pressure-sensitive adhesive tape. It was rolled up and manufactured. The performance of the obtained double-sided pressure-sensitive adhesive tape is shown in Table 1.

(Comparative Example 1) 100 parts by weight of SK Dyne 701 (manufactured by Soken Kagaku Co., Ltd.) as Coronate L- was used as an adhesive on both sides of a non-woven fabric (manufactured by Nankoku Pulp Co., Ltd., trade name: SPC13).
55 parts (manufactured by Nippon Polyurethane Co., Ltd.) mixed with 1 part by weight so that the thickness after drying is 60 μm, and dried.
Double-sided silicone-treated Clupak paper as a peeling film (Fujimori Industry Co., Ltd., trade name: 75N-518T / EF, 1
30 μm) was temporarily attached to a double-sided pressure-sensitive adhesive tape and wound into a roll to produce a double-sided pressure-sensitive adhesive tape.

Comparative Example 2 Polyethylene resin (Mitsui Sekiyu
Made by Kagaku Co., Ltd., product name: ULTOZEX 3520L, density:
0.935 g / cm³) 80 parts by weight, ethylene-α-o
Reffin copolymer (Mitsui Petrochemical Co., Ltd., trade name: Tahuma
-P-0280, density: 0.87 g / cm ³) 20 weight
Mix the parts with a blender, and by the inflation method,
Using a 90mmφ extruder, blow up ratio 1.3, gold
Mold temperature is set to 210 ℃, thickness is 100μm, folding diameter is 1.
A 200 mm film was taken with a mold at a take-up speed of 55 m / min.
Temperature of air enclosed in a tubular film between pinch rolls
Keep the temperature at 60 ° C, and
40m cooling air 60m³/ Min to cool,
A tubular film was formed.

The double-sided pressure-sensitive adhesive tape was rolled in the same manner as in Example 1 except that the above film was used as a peeling film and the opposite side cooled by blowing cooling air from the air ring was temporarily attached to the double-sided pressure-sensitive adhesive tape. It was rolled up and manufactured. The performance of the obtained double-sided pressure-sensitive adhesive tape is shown in Table 1.

Comparative Example 3 Polyethylene resin (manufactured by Mitsui Petrochemical Co., Ltd., trade name: Ultzex 3520L, density:
0.935 g / cm ³ ) by the inflation method
Using a 90mmφ extruder, set the blow-up ratio to 1.3 and the mold temperature to 210 ° C, thickness 100μm, folding diameter 1,
A film of 200 mm was drawn at a speed of 55 m / min, the temperature of the air enclosed in the tubular film between the mold and the pinch roll was kept at 60 ° C., and a cooling air of 23 ° C. was blown from the air ring outside the tubular film. A tubular film was formed by spraying 100 m ³ / min and cooling.

The double-sided pressure-sensitive adhesive tape was rolled in the same manner as in Example 1 except that the above film was used as a peeling film and the opposite side cooled by blowing cooling air from the air ring of the film was temporarily attached to the double-sided pressure-sensitive adhesive tape. It was rolled up and manufactured. The performance of the obtained double-sided pressure-sensitive adhesive tape is shown in Table 1.

(Example 3 = Invention according to claim 2) 80 parts by weight of polyethylene resin (manufactured by Mitsui Petrochemical Co., Ltd., trade name: Neozex NZ3510F, density: 0.935 g / cm ³ ) polyethylene resin (Mitsui Petrochemical Co., Ltd. Product name:
Ultzex 1020L, density: 0.910g / cm
³ ) Mix 20 parts by weight with a blender, and use a 90 mmφ extruder and 1,500 mmφ cooling roll by a flat die method, mold temperature 230 ° C., cooling roll surface temperature 10 ° C., temperature of air blown from an air knife. 3
A film having a thickness of 100 μm and a width of 1,200 mm was set at 0 ° C. and a film was formed at a take-up speed of 130 m / min.

In the same manner as in Example 1, the double-sided adhesive tape was prepared by using the above-mentioned film as a peeling film and blowing the cooling air from the air knife of the film to temporarily attach the opposite surface to the double-sided adhesive tape to form a roll. It was manufactured by winding. The performance of the obtained double-sided pressure-sensitive adhesive tape is shown in Table 1.

(Example 4 = Invention according to claim 2) A polyethylene resin (manufactured by Mitsui Petrochemical Co., Ltd., trade name: Ultzex 1020L, density: 0.910 g / cm ³ ) was applied to a 90 mmφ extruder by a flat die method. 1,500 mmφ
Using a cooling roll of, the mold temperature is set to 230 ° C, the cooling roll surface temperature is set to 10 ° C, and the temperature of the air blown from the air knife is set to 30 ° C, and the thickness is 100 μm and the width is 1,200.
A film having a size of mm was formed at a take-up speed of 130 m / min.

In the same manner as in Example 1, the double-sided pressure-sensitive adhesive tape was prepared by using the above-mentioned film as a peeling film and blowing the cooling air from the air knife of the film to temporarily attach the opposite surface to the double-sided pressure-sensitive adhesive tape to form a roll. It was manufactured by winding. The performance of the obtained double-sided pressure-sensitive adhesive tape is shown in Table 1.

(Comparative Example 4) 80 parts by weight of polyethylene resin (manufactured by Mitsui Petrochemical Co., Ltd., trade name: Neozex NZ3510F, density: 0.935 g / cm ³ ), polyethylene resin (manufactured by Mitsui Petrochemical Co., Ltd., trade name: Ultzex) 10
20 L, density: 0.910 g / cm ³ ) 20 parts by weight are mixed by a blender, and 90 mmφ by a flat die method.
Extruder, 1,500 mmφ cooling roll is used, mold temperature is 230 ° C., cooling roll surface temperature is 15 ° C., temperature of air blown from an air knife is 30 ° C., and film is 100 μm thick and 1200 mm wide. Take-up speed 1
The film was molded at 00 m / min.

In the same manner as in Example 1, the double-sided adhesive tape was prepared by using the above-mentioned film as a peeling film and blowing the cooling air from the air knife of the film to temporarily attach the opposite surface to the double-sided adhesive tape to form a roll. It was manufactured by winding. The performance of the obtained double-sided pressure-sensitive adhesive tape is shown in Table 1.

(Comparative Example 5) Polyethylene resin (manufactured by Mitsui Petrochemical Co., Ltd., trade name: Ultzex 1020L, density:
0.910 g / cm ³ ) by the flat die method to 90
Using a mmφ extruder and a 1,500 mmφ cooling roll, the mold temperature was set to 230 ° C., the cooling roll surface temperature was set to 15 ° C., the temperature of the air blown from the air knife was set to 30 ° C., and the thickness was 100 μm and the width was 1,200 mm. The film was formed at a take-up speed of 100 m / min.

In the same manner as in Example 1, the double-sided adhesive tape was prepared by using the above-mentioned film as a peeling film and blowing the cooling air from the air knife of the film to temporarily attach the opposite surface to the double-sided adhesive tape to form a roll. It was manufactured by winding. The performance of the obtained double-sided pressure-sensitive adhesive tape is shown in Table 1.

[0036]

[Table 1]

[0037]

According to the method for producing a double-sided pressure-sensitive adhesive tape of the present invention as set forth in claim 1, the polyolefin resin is heated and melted by an extruder, extruded into a tubular shape by a circular die, and cooled from the outside of the tubular film. A frost line in which a tubular film to be extruded is solidified from a molten state by providing a temperature difference between the wind and the pressurized gas from the inside and further increasing the amount of air discharged from the air ring under general film forming conditions. Since the double-sided pressure-sensitive adhesive tape is attached to one surface of the peeling film formed by changing the cooling conditions of the inner and outer surfaces of the tubular film up to the position, and is then wound, the manufacturing process of the peeling film used Then, by changing the cooling conditions of the inner and outer surfaces of the peeling film as described above, a subtle difference is given to the crystallization of the polyolefin resin used, and films having different smoothness on both surfaces are obtained. The rougher surface side of the peeling film, that is, the outer surface of the tubular film is placed outside and laminated on the outer surface of the double-sided pressure-sensitive adhesive tape, and the double-sided pressure-sensitive adhesive tape is manufactured by rolling. When the obtained double-sided adhesive tape is used, it can be unwound and unfolded extremely smoothly, and due to the chemical inertness of the polyolefin-based resin, a peeling film from the double-sided adhesive tape that is pasted on one side of the object Can be easily peeled off.

In the double-sided pressure-sensitive adhesive tape manufacturing method of the present invention as set forth in claim 2, the polyolefin resin is heated and melted by an extruder and extruded into a film by a flat die, and one surface of the film is brought into contact with a cooling roll. While cooling, a temperature difference is provided between the surface temperature of the cooling roll at that time and the discharge gas temperature of the air knife that presses the film against the cooling roll from the opposite surface, and further sprayed from the outside of the film from the air knife. The amount of air to be blown is generally controlled by cooling the front and back surfaces of the film up to the position of the frost line where the film is extruded with a larger amount of air than in the case of manufacturing a packaging film or a heat insulating film for agriculture. Since the double-sided adhesive tape is attached to one surface of the peeling film that has been formed in a different manner and is then wound, the peeling film to be used is manufactured. In the process, by changing the inner and outer cooling conditions of the peeling film as described above, a subtle difference is given to the crystallization of the polyolefin resin used, and films having different smoothness on both surfaces are obtained. It is obtained because the double-sided pressure-sensitive adhesive tape is manufactured by laminating the film on the rougher surface side, that is, with the outer surface of the tubular film facing outward, and superposing it on the outer surface of the double-sided pressure-sensitive adhesive tape. Rewinds very smoothly when using double-sided adhesive tape,
It can be developed, and due to the chemical inertness of the polyolefin resin, the peeling film can be easily peeled from the double-sided pressure-sensitive adhesive tape having one surface stuck to the object.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B29C 69/00 2126-4F // B29C 55/28 7639-4F

Claims (2)

[Claims] 1. A polyolefin resin is heated and melted by an extruder and extruded in a cylindrical shape by a circular die, and a temperature difference is generated between cooling air from the outside of the cylindrical film and pressurized gas from the inside. Provided, a tubular film to be extruded by sticking a double-sided adhesive tape on one surface of the peeling film formed by changing the cooling conditions of the inner and outer surfaces of the tubular film from the molten state to the position of the frost line where it solidifies, A method for producing a double-sided pressure-sensitive adhesive tape, which is characterized by being wound. 2. A temperature at which a polyolefin resin is heated and melted by an extruder and extruded into a film by a flat die, and one surface of the film is cooled by contacting with a cooling roll.
Cooling conditions for the front and back surfaces of the film from the opposite surface to the position of the frost line at which the extruded film is solidified from the molten state by providing a temperature difference between the temperature of the gas discharged from the air knife that presses the film against the cooling roll from the opposite surface. A method for producing a double-sided pressure-sensitive adhesive tape, which comprises sticking a double-sided pressure-sensitive adhesive tape to one surface of a peeling film formed by changing the above, and winding.