JP2011236300A - Coreless adhesive material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coreless adhesive material having excellent properties and not causing a so-called tunneling phenomenon in the width direction (or a phenomenon called a floating phenomenon) which is one of serious defects in a double-sided adhesive tape and is strongly required to be improved.SOLUTION: The coreless adhesive material is obtained by sticking a release film on both sides of an adhesive layer, wherein sagging of the release film is in one direction and a sagging amount is ≤17 mm/1,000 mm width.

Description

  The present invention relates to a coreless pressure-sensitive adhesive material.

  Adhesive tape is used in various industrial fields. Adhesive tape is a single-sided tape with adhesive applied to one side of the substrate, double-sided tape with adhesive applied to both sides of the substrate or core, and coreless (non-carrier) where both sides are adhesive surfaces without a substrate In the form of double-sided tape (transfer tape).

  One problem with adhesive tape is the tunneling phenomenon (also called the floating phenomenon). This phenomenon of tunneling must be avoided in the longitudinal direction of the wound material because a dimensional difference due to an increase in diameter always occurs between the base film layer on the roll center side and the base film layer on the roll outer periphery side. Difficult to do. The force based on the difference in internal strain between the bonded substrates causes the adhesive to cohesively break.

  Therefore, Patent Documents 1 and 2 disclose that the structure and peeling force of the pressure-sensitive adhesive are limited to a certain range. In the case of a coreless pressure-sensitive adhesive, a release film is used on both sides, and because of restrictions such as the balance of peeling force between the two release films, tunneling is particularly likely to occur. Tunneling may occur not only in the longitudinal direction but also in the width direction. This is likely to occur when the dimensional difference between both ends of the release film used is large, that is, when the tarmi is large. This is because the tension is adjusted by the tension during processing of the adhesive material, and this tension causes internal distortion and is released when the product adhesive is cured at room temperature or stored.

JP-A-6-234184 JP 2005-161690 A

  This invention is made | formed in view of the said situation, Comprising: The solution subject is providing the coreless adhesive material without the tunneling of the width direction.

  As a result of intensive studies in view of the above circumstances, the present inventor has found that the above-described problems can be easily solved by using a specific release film, and has completed the present invention.

  That is, the gist of the present invention is an adhesive material in which a release film is attached to both sides of an adhesive layer, the direction of the tarmi of the release film is the same, and the amount of the tarmi is 17 mm / 1000 mm width or less. It exists in the coreless adhesive material characterized by being.

  According to the coreless pressure-sensitive adhesive material of the present invention, the occurrence of tunneling in the width direction can be suppressed, and the industrial value of the present invention is high.

  The release film to be attached to both surfaces of the pressure-sensitive adhesive material of the present invention is not particularly limited as long as it uses a polymer film as a base material, but it is particularly preferable to use a polyester film as a base material. Hereinafter, although a polyester film is explained in full detail as an example, this invention is not limited to a polyester film.

  The raw material polyester for the polyester film may be a homopolyester or a copolyester. When using a homopolyester, those obtained by polycondensation of an aromatic dicarboxylic acid and an aliphatic glycol are preferred. Examples of the aromatic dicarboxylic acid include terephthalic acid and 2,6-naphthalenedicarboxylic acid, and examples of the aliphatic glycol include ethylene glycol, diethylene glycol, and 1,4-cyclohexanedimethanol. Representative polyesters include polyethylene terephthalate (PET), polyethylene-2,6-naphthalenedicarboxylate (PEN), and the like.

  On the other hand, when a copolymer polyester is used, it is preferably a copolymer containing 30 mol% or less of the third component. Examples of the dicarboxylic acid component of the copolyester include one or two of isophthalic acid, terephthalic acid phthalate, 2,6-naphthalenedicarboxylic acid, adipic acid sebacic acid, and oxycarboxylic acid (for example, P-oxybenzoic acid). Examples of the glycol component include one or more of ethylene glycol, diethylene glycol, propylene glycol, butanediol, 1,4-cyclohexanedimethanol, neopentyl glycol, and the like.

  In any case, the polyester referred to in the present invention is usually 70 mol% or more, preferably 90 mol% or more of polyethylene terephthalate having ethylene terephthalate units, or polyethylene-2,6-naphthalate having ethylene-2,6-naphthalate units. Refers to a polyester that is the like.

  In the film used in the present invention, it is preferable to blend particles for the main purpose of imparting slipperiness. The kind of the particle to be blended is not particularly limited as long as it is a particle capable of imparting slipperiness. Specific examples thereof include silica, calcium carbonate, magnesium carbonate, barium carbonate, calcium sulfate, calcium phosphate, and phosphoric acid. Examples of the particles include magnesium, kaolin, aluminum oxide, and titanium oxide. Further, the heat-resistant organic particles described in JP-B-59-5216, JP-A-59-217755 and the like may be used. Examples of other heat-resistant organic particles include thermosetting urea resins, thermosetting phenol resins, thermosetting epoxy resins, benzoguanamine resins, and the like. Furthermore, precipitated particles obtained by precipitating and finely dispersing a part of a metal compound such as a catalyst during the polyester production process can also be used.

On the other hand, the shape of the particles to be used is not particularly limited, and any of a spherical shape, a block shape, a rod shape, a flat shape, and the like may be used. Moreover, there is no restriction | limiting in particular also about the hardness, specific gravity, a color, etc. These series of particles may be used in combination of two or more as required.
The average particle size of the particles used is preferably in the range of 0.1 to 5 μm, more preferably in the range of 0.5 to 5 μm. If the average particle size is less than 0.1 μm, the particles tend to aggregate and the dispersibility tends to be insufficient. On the other hand, if it exceeds 5 μm, the surface roughness of the film becomes too rough, Problems may occur when a release layer is provided in a subsequent process.

  Furthermore, the particle content in the film is preferably in the range of 0.01 to 5% by weight, more preferably in the range of 0.01 to 3% by weight. When the particle content is less than 0.01% by weight, the slipperiness of the film may be insufficient. On the other hand, when the content exceeds 5% by weight, the particle size of the particles is too large. As in the case, problems may occur in the step of providing the release layer.

  The method for adding particles to the film is not particularly limited, and a conventionally known method can be adopted. For example, the particles can be added at any stage of producing the film raw material.

  Also, a method of blending a slurry of particles dispersed in an organic solvent or water with a vented kneading extruder and a film raw material, or a blend of dried particles and film raw material using a kneading extruder. It is done by methods.

  The thickness of the release film used in the present invention is not particularly limited as long as it can be formed as a film, but is usually 9 to 250 μm, preferably 12 to 188 μm.

  Next, although the example of a polyester film is demonstrated concretely about the manufacture example of the film used by this invention, this invention is not limited to the following manufacture examples at all.

  That is, a method of using the polyester raw material described above and cooling and solidifying a molten sheet extruded from a die with a cooling roll to obtain an unstretched sheet is preferable. In this case, in order to improve the flatness of the sheet, it is preferable to improve the adhesion between the sheet and the rotary cooling drum, and an electrostatic application adhesion method and / or a liquid application adhesion method is preferably employed.

  Next, the obtained unstretched sheet is stretched in the biaxial direction. In that case, first, the unstretched sheet is stretched in one direction by a roll or a tenter type stretching machine. The stretching temperature is usually 70 to 120 ° C., preferably 80 to 110 ° C., and the stretching ratio is usually 2.5 to 7 times, preferably 3.0 to 6 times. Subsequently, the extending | stretching temperature orthogonal to the extending | stretching direction of the 1st step is 130-170 degreeC normally, and a draw ratio is 3.0-7 times normally, Preferably it is 3.5-6 times. Subsequently, heat treatment is performed at a temperature of 180 to 270 ° C. under tension or relaxation within 30% to obtain a biaxially oriented film.

  In the above-described stretching, a method in which stretching in one direction is performed in two or more stages can be employed. In that case, it is preferable to carry out so that the draw ratios in the two directions finally fall within the above ranges. The unstretched sheet can be simultaneously biaxially stretched so that the area magnification is 10 to 40 times. Furthermore, it may be stretched again in the longitudinal and / or transverse direction before or after performing the heat treatment, if necessary.

  A so-called coating stretching method (in-line coating) in which the film surface is treated during the above-described polyester film stretching step can be applied. Although it is not limited to the following, for example, in the sequential biaxial stretching, in particular, the first-stage stretching is completed, and the coating treatment can be performed before the second-stage stretching. When a coating layer is provided on a polyester film by the above-described coating stretching method, coating can be performed simultaneously with stretching and the thickness of the coating layer can be reduced according to the stretching ratio, which is suitable as a polyester film. A film can be manufactured.

  It is practically preferable that the release film used in the present invention has a release surface having a peeling force within a specific range. That is, in the release film of the present invention, the normal release force of the heavy release release film is preferably in the range of 200 mN / cm or less, more preferably in the range of 20 mN / cm or more and 200 mN / cm or less. When the normal state peeling force exceeds 200 mN / cm, there is a problem that the pressure-sensitive adhesive layer is difficult to peel off and the pressure-sensitive adhesive layer is easily broken particularly when the pressure-sensitive adhesive layer is thin or soft. On the other hand, in the case of less than 20 mN / cm, there may be a problem that the release film is partially peeled off from the adhesive at the film edge during the process.

  The residual adhesive rate of the release film used in the present invention is preferably 80% or more, more preferably 85% or more. When the residual adhesive rate is less than 80%, there is a concern that the silicone transfer to the counterpart pressure-sensitive adhesive that comes into contact with the release surface of the release film increases, and the adhesive force when pasting to another substrate is reduced.

  In addition, in the film constituting the release film used in the present invention, as a method for forming the film surface having the maximum height (Rmax), a particle kneading method, a particle coating method, an embossing method, a sand blasting method, an etching method are used. A method such as a method or an electric discharge machining method can be used. In the present invention, any of the methods described above may be adopted, and there is no particular limitation.

  Next, typical methods will be described in detail, but the present invention is not limited to the following production examples.

  The particle kneading method involves adding inorganic fine particles such as titanium oxide, calcium carbonate, silica, kaolin or the like in the course of manufacturing a film, or leaving the precipitated fine particles of catalyst residue in the raw material in the course of manufacturing the film. This is a method of roughening the film surface.

  The embossing method is a method of roughening the film surface by embossing at a predetermined temperature using an apparatus composed of an embossing roll and a backup roll having a desired uneven shape.

  The particle coating method is a method in which a roughened surface is formed on a film by applying a coating solution having an appropriate viscosity prepared from particles, a binder, and a solvent to the film surface. Examples of the particles include inorganic particles such as silica, alumina, calcium carbonate, and titanium oxide, and organic particles such as silicone resin, fluorine resin, and benzoguanamine resin. Examples of the binder include polyester resins, acrylic resins, polyvinyl butyral resins, polyurethane resins, phenoxy resins, epoxy resins, polyvinyl chloride resins, and compounds containing radical polymerizable double bonds. Examples of the coating apparatus include a gravure coater, a reverse coater, and a wire bar coater. In addition, an antifoamer, a coating property improving agent, a thickener, a particle dispersion stabilizing resin, and the like can be added to the coating solution as necessary.

  The release layer constituting the release film used in the present invention is not particularly limited as long as it contains a material having releasability. Among such materials, it is preferable to use a curable silicone resin because release properties are particularly improved.

  A type having a curable silicone resin as a main component may be used, or a modified silicone type by graft polymerization with an organic resin such as a urethane resin, an epoxy resin, or an alkyd resin may be used.

  As the type of the curable silicone resin, any of the curing reaction types such as an addition type, a condensation type, an ultraviolet ray curable type, an electron beam curable type, and a solventless type can be used.

  Specific examples of the curable silicone resin include KS-772, KS-774, KS-775, KS-778, KS-779H, KS-856, X-62-2422, X- manufactured by Shin-Etsu Chemical Co., Ltd. 62-2461, DKQ3-202, DKQ3-203, DKQ3-204, DKQ3-205, DKQ3-210, FSQK-2560, FSRK-2560 manufactured by Dow Corning Asia Co., Ltd. YSR-3022, TPR-6700 manufactured by Toshiba Silicone Co., Ltd. , TPR-6720, TPR-6721, SD7220, SD7226, SD7229 manufactured by Toray Dow Corning Co., Ltd., and the like.

  Further, a release control agent may be used in combination in order to adjust the peelability of the release layer.

The coating amount (Si) of the release layer constituting the release film of the present invention is 0.01 to 5 g / m ² , further 0.01 to ² g / m ² , particularly 0.01 to 1 g / m ² . A range is preferred. When the coating amount of the release layer is less than 0.01 g / m ² , the coated surface may lack stability and it may be difficult to obtain a uniform coating film. On the other hand, when the coating amount exceeds 5 g / m ² , the coating film adhesion and curability of the release layer itself may be deteriorated.
In the present invention, conventionally known coating methods such as reverse roll coating, gravure coating, and bar coating can be used as a method for providing a release layer on the film.

  Regarding the application of the pressure-sensitive adhesive layer, the pressure-sensitive adhesive layer is applied to one release surface of the obtained film with a pressure-sensitive adhesive coating machine, and then passed through a drying furnace to dry and cure the pressure-sensitive adhesive layer and wind it.

  In order to prevent adhesion at the time of winding, a release film is bonded to the adhesive surface after drying and curing, and the film is wound as a film roll with a separator. As the release film, various curable silicone resin coating liquids coated on one side of a polyester film base with a thickness of 25 to 38 μm, dried and cured can be used. In this case, the thickness of the silicone release layer is generally Specifically, 0.05 to 0.2 μm is used.

  The thickness of the pressure-sensitive adhesive layer after drying is suitably 5 to 35 μm, preferably 10 to 30 μm, and more preferably 15 to 25 μm.

  For the adhesive layer, various acrylic acid esters or methacrylic acid esters are the main components, and many of these are copolymerized with various monomers. However, it is preferable to select a weak adhesive type as the adhesive layer having removability. However, in the case of a weak adhesive type pressure-sensitive adhesive layer, when the thickness is 5 μm or less, the adhesive force is insufficient, and troubles such as floating of the release film and poor adhesion are likely to occur.

  The coreless pressure-sensitive adhesive material of the present invention is a pressure-sensitive adhesive material in which a release film is attached to both sides of the pressure-sensitive adhesive layer, the direction of the tarmi of the release film is the same, and the amount of the tarmi is 17 mm / 1000 mm width or less. It is essential to be.

  The meaning of combining those with the same direction of Talmi can be broadly classified into three types: Talmi (Right part), Bridge Talmi (Left part), and Middle Dalmi (Center part). It refers to the combination of the same patterns or end tarmi and middle dharmi.

  When used in a combination other than the above, or when a release film having a tarmi amount exceeding 17 mm / 1000 mm width is used, a tunneling phenomenon occurs and it cannot be put to practical use.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited to a following example, unless the summary is exceeded. The measuring method used in the present invention is as follows.

(1) Measurement of Intrinsic Viscosity of Polyester 1 g of a sample was precisely weighed, 100 ml of a mixed solvent of phenol / tetrachloroethane = 50/50 (weight ratio) was added and dissolved, and measured at 30 ° C.

(2) Measurement of average particle diameter (d ₅₀ : μm) Integration (weight basis) 50% in equivalent spherical distribution measured using centrifugal sedimentation type particle size distribution measuring device (SA-CP3 type manufactured by Shimadzu Corporation) Was the average particle size.

(3) Measurement of maximum height (Rmax) of polyester film Only a reference length (2.5 mm) was extracted from a cross-sectional curve obtained by a surface roughness measuring machine (SE-3F) manufactured by Kosaka Laboratory Ltd. When the extracted part is sandwiched by two straight lines parallel to the average line of the part (hereinafter referred to as the extracted part), the distance between the two straight lines is measured in the direction of the vertical magnification of the cross-sectional curve, and the value is measured in units of micrometers (μm) The maximum height of the extracted part is represented by. The maximum height was expressed as an average value of the maximum heights of the extracted portions obtained from 10 cross-sectional curves obtained from the sample film surface. The radius of the stylus used at this time was 2.0 μm, the load was 30 mg, and the cutoff value was 0.08 mm.

(4) Evaluation of peel strength (F) of release film One side of a double-sided pressure-sensitive adhesive tape (Nitto Denko “No. 502”) was attached to the release layer of the measurement sample, cut into a size of 50 mm × 300 mm, and room temperature The peel force after standing for 1 hour was measured. For the peeling force, a tensile tester (“Intesco model 2001 type” manufactured by Intesco Co., Ltd.) was used, and 180 ° peeling was performed under the condition of a tensile speed of 300 mm / min.

(5) Measurement of release layer coating amount (Si) Using a fluorescent X-ray measurement apparatus (model “XRF-1500”, manufactured by Shimadzu Corporation), the FP (Fundamental Parameter Method) method allows the following measurement conditions: The amount of silicon element on the surface of the release film provided with the release layer and the surface without the release layer was measured, and the difference was taken as the amount of silicon element in the release layer.
Next, the coating amount (Si) (g / m ² ) as a unit of —SiO (CH ₃ ) ₂ was calculated using the obtained amount of silicon element.
"Measurement condition"
Spectral crystal: PET (pentaerythritol)
2θ: 108.88 °
Tube current: 95 mA
Tube voltage: 40 kv
In the case where no silicon element is present in the release layer, the coating amount is measured by a technique such as cross-sectional observation.

(6) Evaluation of Residual Adhesion Rate of Release Film / Residual Adhesive Strength Nitto Denko (manufactured) No. The 31B adhesive tape is subjected to one reciprocating pressure bonding with a 2 kg rubber roller, and heat-treated at 100 ° C. for 1 hour. Next, the sample film was peeled off from the pressure-bonded sample. The adhesive strength of the 31B adhesive tape was measured according to the method of JIS-C-2107 (adhesive strength to stainless steel plate, 180 ° peeling method), and this was defined as the residual adhesive strength.

・ Basic adhesive strength Using the same tape (No. 31B) as the residual adhesive strength, press the adhesive tape on the stainless steel plate according to JIS-C-2107, and measure in the same way. The value was defined as basic adhesive strength. Using these measured values, the residual adhesion rate was determined based on the following formula.
Residual adhesion rate (%) = (residual adhesive force / basic adhesive force) × 100
The measurement was performed at 20 ± 2 ° C. and 65 ± 5% RH.

(7) Talmi measurement method The height of the central part of the film stretched between two rolls is measured in the width direction with an ultrasonic displacement sensor, and the pattern of the talmi is recorded. The difference in position between the deepest part and the shallowest part of the amount of film sag is defined as the amount of talmi.

(8) Confirmation of occurrence of tunneling in the width direction After processing the adhesive material on one release film, the other release film is bonded to wind up the product. Next, in order to cure the adhesive material, it is left at room temperature for 1 week. Unwind the product roll and check the occurrence of tunneling.
<Criteria>
○… No tunneling occurred ×… Tunneling occurred

Example 1:
3 parts of silicon dioxide particles having an average particle size of 3.5 μm, polyethylene terephthalate having an intrinsic viscosity of 0.65 are dried at 180 ° C. for 4 hours in an inert gas atmosphere, melted at 290 ° C. by a melt extruder, And then solidified by cooling on a cooling roll having a surface temperature set to 40 ° C. using an electrostatic application adhesion method to obtain an unstretched sheet. The obtained sheet was stretched 3.5 times in the longitudinal direction at 85 ° C. Next, the film was guided to a tenter and stretched 3.7 times in the transverse direction at 100 ° C. and then heat-set at 230 ° C. to obtain a PET film master roll (Rmax = 4.5 μm) having a thickness of 38 μm. The taking position was changed in the master roll width direction, and base film 1, base film 2, base film 3 (center), base film 4 and base film 5 (right end) were obtained from the upper left end.

A release layer composed of silicone resin A1 is provided on both sides of the PET film so that the coating amount is 0.1 g / m ² (after drying) on the base film 3 obtained above, and the normal peel strength is 18 mN / cm. A release film 1 was obtained. The release film 1 had a talmi of 5 mm / m.

On the other hand, a release layer made of silicone resin B1 is provided on both sides of the PET film so that the coating amount is 0.1 g / m ² (after drying) on the base film 3 obtained above, and the normal peel strength is 60 mN / A release film 2 of cm was obtained. The release film 2 had a talmi of 5 mm / m.

The following adhesive was applied as an adhesive to the release film 1 and then dried and cured at 130 ° C. for 1 minute to obtain an adhesive having an adhesive layer with a coating thickness of 20 μm after drying.
-Adhesive composition: Acrylic adhesive (Teikoku Co., Ltd., SG-800) and isocyanate curing agent (Nihon Polyurethane Co., Ltd., Coronate HL) were mixed at a ratio of 100/10 (weight ratio in terms of solid content). Coating liquid

Example 2:
In Example 1, a release film 1 was obtained in the same manner as in Example 1 except that the film of the base film 2 was used instead of the base film 3. The release film 1 had an end thickness (right) of 11 mm / m.
Next, in Example 1, a release film 2 was obtained in the same manner as Example 1 except that the film of the base film 2 was used instead of the base film 3. The release film 2 had an end thickness (right) of 11 mm / m.
Using the above release film, an adhesive material was obtained in the same manner as in Example 1.

Example 3:
In Example 1, a release film 1 was obtained in the same manner as in Example 1 except that the film of the base film 4 was used instead of the base film 3. The release film 1 had an end thickness (left) of 13 mm / m.
Next, in Example 1, a release film 1 was obtained in the same manner as in Example 1 except that the film of the base film 4 was used instead of the base film 3. The release film 1 had an end thickness (left) of 13 mm / m.
Using the above release film, an adhesive material was obtained in the same manner as in Example 1.

Example 4:
A release film 1 was obtained using the base film 3 in the same manner as in Example 1. The release film 1 had a talmi of 5 mm / m.
Next, in Example 1, a release film 2 was obtained in the same manner as Example 1 except that the film of the base film 2 was used instead of the base film 3. The release film 2 had an end thickness (right) of 11 mm / m.
Using the above release film, an adhesive material was obtained in the same manner as in Example 1.

Example 5:
A release film 1 was obtained using the base film 3 in the same manner as in Example 1. The release film 1 had a talmi of 5 mm / m.
Next, in Example 1, a release film 2 was obtained in the same manner as Example 1 except that the film of the base film 4 was used instead of the base film 3. The release film 2 had an end thickness (left) of 13 mm / m.
Using the above release film, an adhesive material was obtained in the same manner as in Example 1.

Example 6:
In Example 1, a release film 1 was obtained in the same manner as in Example 1 except that the film of the base film 2 was used instead of the base film 3. The release film 1 had an end thickness (right) of 11 mm / m.
Next, a release film 2 was obtained using the base film 3 in the same manner as in Example 1. The release film 2 had a talmi of 5 mm / m.
Using the above release film, an adhesive material was obtained in the same manner as in Example 1.

Example 7:
In Example 1, a release film 1 was obtained in the same manner as in Example 1 except that the film of the base film 4 was used instead of the base film 3. The release film 1 had an end thickness (left) of 13 mm / m.
Next, a release film 2 was obtained using the base film 3 in the same manner as in Example 1. The release film 2 had a talmi of 5 mm / m.
Using the above release film, an adhesive material was obtained in the same manner as in Example 1.

Comparative Example 1:
In Example 1, a release film 1 was obtained in the same manner as in Example 1 except that the film of the base film 5 was used instead of the base film 3. The release film 1 had an end thickness (left) of 19 mm / m.
Next, in Example 1, a release film 2 was obtained in the same manner as Example 1 except that the film of the base film 5 was used instead of the base film 3. The release film 2 had an end tarmi (left) of 19 mm / m.
Using the above release film, an adhesive material was obtained in the same manner as in Example 1.

Comparative Example 2
In Example 1, a release film 1 was obtained in the same manner as in Example 1 except that the film of the base film 1 was used instead of the base film 3. The release film 1 had an end thickness (right) of 18 mm / m.
Next, in Example 1, a release film 1 was obtained in the same manner as in Example 1 except that the film of the base film 1 was used instead of the base film 3. The release film 1 had an end thickness (right) of 18 mm / m.
Using the above release film, an adhesive material was obtained in the same manner as in Example 1.

Comparative Example 3:
In Example 1, a release film 1 was obtained in the same manner as in Example 1 except that the film of the base film 2 was used instead of the base film 3. The release film 1 had an end thickness (right) of 11 mm / m.
Next, in Example 1, a release film 2 was obtained in the same manner as Example 1 except that the film of the base film 4 was used instead of the base film 3. The release film 2 had an end thickness (left) of 13 mm / m.
Using the above release film, an adhesive material was obtained in the same manner as in Example 1.

Comparative Example 4:
In Example 1, a release film 1 was obtained in the same manner as in Example 1 except that the film of the base film 1 was used instead of the base film 3. The release film 1 had an end thickness (left) of 13 mm / m.
Next, in Example 1, a release film 2 was obtained in the same manner as in Example 1 except that the film of the base film 1 was used instead of the base film 3. The release film 2 had an end thickness (right) of 11 mm / m.
Using the above release film, an adhesive material was obtained in the same manner as in Example 1.

Comparative Example 5:
A release film 1 was obtained in the same manner as in Example 1. The release film 1 had a talmi of 5 mm / m.
Next, in Example 1, a release film 2 was obtained in the same manner as in Example 1 except that the film of the base film 1 was used instead of the base film 3. The release film 2 had an end thickness (right) of 18 mm / m.
Using the above release film, an adhesive material was obtained in the same manner as in Example 1.

Comparative Example 6:
In Example 1, a release film 1 was obtained in the same manner as in Example 1 except that the film of the base film 1 was used instead of the base film 3. The release film 1 had an end thickness (right) of 18 mm / m.
Next, a release film 2 was obtained in the same manner as in Example 1. The release film 2 had a talmi of 5 mm / m.
Using the above release film, an adhesive material was obtained in the same manner as in Example 1.

Comparative Example 7:
A release film 1 was obtained in the same manner as in Example 1. The release film 1 had a talmi of 5 mm / m.
Next, in Example 1, a release film 2 was obtained in the same manner as Example 1 except that the film of the base film 5 was used instead of the base film 3. The release film 2 had an end tarmi (left) of 19 mm / m.
Using the above release film, an adhesive material was obtained in the same manner as in Example 1.

Comparative Example 8:
In Example 1, the release film 1 was obtained using the film of the base film 5 instead of the base film 3. The release film 2 had an end tarmi (left) of 19 mm / m.
Next, a release film 2 was obtained in the same manner as in Example 1. The release film 2 had a talmi of 5 mm / m.
Using the above release film, an adhesive material was obtained in the same manner as in Example 1.

Comparative Example 9:
In Example 1, the release film 1 was obtained using the film of the base film 5 instead of the base film 3. The release film 2 had an end tarmi (left) of 19 mm / m.
Next, in Example 1, a release film 2 was obtained in the same manner as in Example 1 except that the film of the base film 1 was used instead of the base film 3. The release film 2 had a Talmi of 18 mm / m end Talmi (right).
Using the above release film, an adhesive material was obtained in the same manner as in Example 1.

Comparative Example 10:
In Example 1, the release film 1 was obtained using the film of the base film 5 instead of the base film 3. The release film 2 had an end thickness (right) of 18 mm / m.
Next, in Example 1, a release film 2 was obtained in the same manner as in Example 1 except that the film of the base film 1 was used instead of the base film 3. The release film 2 had an end tarmi (left) of 19 mm / m.
Using the above release film, an adhesive material was obtained in the same manner as in Example 1.
The characteristics of the coreless adhesive materials obtained in the above examples and comparative examples are summarized in Tables 1 to 4 below.

  The adhesive material of this invention can be utilized suitably as a double-sided adhesive tape, for example.

Claims (1)

A pressure-sensitive adhesive material in which a release film is pasted on both sides of an adhesive layer, wherein the direction of the tarmi of the release film is the same, and the amount of the tarmi is 17 mm / 1000 mm width or less. Adhesive material.