JP4269779B2 - Release agent and adhesive laminated tape - Google Patents

Description

【００６９】
【発明の効果】
以上説明した本発明によれば、シリコーン系発ガス成分を含まず、種々の粘着剤に対して良好な離型性を有すると共に、剥離力の変動が小さく、且つ粘着剤と貼り合わせて加熱下に置いた後も低い剥離力を保持できる離型剤が提供され、本発明の工業的価値は顕著である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a release agent and an adhesive laminated tape. In this specification, the term “adhesive” has a broad meaning including adhesion.
[0002]
[Prior art]
Release agents are widely used to protect the adhesive surface of adhesive tapes. One of the release agents that is most excellent in terms of release performance is a silicone release agent. Incidentally, a small amount of siloxane-based gas is contained in the silicone-based release agent, and this siloxane-based gas may cause corrosion and other serious obstacles depending on the application. A fluororesin-based mold release agent has been proposed in place of the silicone-type mold release agent, but its mold release performance is not necessarily satisfactory.
[0003]
In addition, the release agent composed of the polyethylene resin composition includes a release agent mainly composed of a low density polyethylene resin (see, for example, Patent Documents 1 and 2), and a mold release mainly composed of a high density polyethylene resin. There are agents (see, for example, Patent Documents 3 and 4). The release agent mainly composed of low-density polyethylene resin requires a large peeling force. When used as a pressure-sensitive adhesive layer protective film, part of the adhesive layer moves to the release layer surface or peels off when it is peeled off. When the surface of the adhesive layer on the surface causes a peeling called stick-slip with a pulse shape, or when heated in a state where it is bonded to the adhesive, the peeling force increases or the adhesive strength of the adhesive after peeling There is a problem such as lowering.
[0004]
Furthermore, a release material using a thermoplastic elastomer-olefin elastomer whose main component is polypropylene has been proposed (see, for example, Patent Document 5), and a release material comprising a propylene ethylene copolymer and a polypropylene composition has been proposed (for example, (See Patent Document 6). However, these have high peeling force and are not practically sufficient.
[0005]
[Patent Document 1]
Japanese Patent Publication No.51-20205
[Patent Document 2]
Japanese National Patent Publication No. 11-508958
[Patent Document 3]
JP 2000-239624 A
[Patent Document 4]
JP 2000-119411 A
[Patent Document 5]
Special table 2001-516790 gazette
[Patent Document 6]
JP 2000-218745 A
[0006]
[Problems to be solved by the invention]
The present invention has been made in view of the above circumstances, and its purpose is not to include a silicone-based generated gas component, and has good releasability with respect to various pressure-sensitive adhesives, and has a small variation in peeling force. And it is providing the mold release agent which can hold | maintain a low peeling force, after bonding with an adhesive and putting it on heating.
[0007]
[Means for Solving the Problems]
  That is, the first gist of the present invention is as follows.Manufactured using a metallocene-based catalyst andEthylene and one or more α-olefins (however,Limited to C3-C20 α-olefins) And onlyThe α-olefin content is 1 to 25 mol%An ethylene copolymer (A)The weight average molecular weight is 1 × 10 ⁴ Above andPolypropylene content is 80% by weight or more(However, when it has a copolymer component, it is limited to one or more of α-olefins having 3 to 20 carbon atoms.)A mold release agent comprising a propylene polymer (B), wherein the weight ratio of the ethylene copolymer (A) and the propylene polymer (B) is 40:60 to 90:10. .
[0008]
The second gist of the present invention resides in an adhesive laminate comprising an adhesive layer and a release layer, wherein the release layer comprises the above release agent.
[0009]
The third gist of the present invention is an adhesive laminated tape provided such that an adhesive layer of an adhesive laminate comprising an adhesive layer and a release layer is in contact with the substrate on at least one surface of the substrate, The present invention resides in an adhesive laminated tape characterized in that the release layer is composed of the above release agent.
[0010]
The fourth gist of the present invention is an adhesive laminated tape in which a base material, a release layer, an adhesive layer and an adhesive layer base material are laminated in this order, and the release layer is composed of the above release agent. It exists in the adhesive laminated tape characterized by this.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail. First, the release agent of the present invention will be described. The release agent of the present invention contains an ethylene copolymer (A) and a propylene polymer (B) described below as essential components.
[0012]
  The ethylene copolymer (A) is composed of ethylene and one or more α-olefins (however,Limited to C3-C20 α-olefins) And only. Examples of the α-olefin include propylene, 1-butene, 1-pentene, 3-methyl-1-butene, 1-hexene, 4-methyl-1-pentene, 3-methyl-1-pentene, 1-heptene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicocene, etc.Α-Olefin etc. are mentioned. Among these, one or more of propylene, butene, hexene, and octene is preferable. The copolymerization ratio of α-olefin in the ethylene copolymer (A) is1-25 mol%, preferably 3-15 mol%. When the copolymerization ratio of the α-olefin is too high and the ethylene content is too low, the heat resistance of the release agent tends to decrease.
[0013]
  In the present invention, MeEthylene copolymer (A) produced using tarocene catalystIs used.Metallocene-based catalysts give polyolefins with a narrow molecular weight distribution and low low molecular weight components, and can uniformly carry out copolymerization, so that the generation of components whose comonomer content is significantly different from the average composition is also suppressed. . Therefore, the release agent using the ethylene copolymer (A) produced using the metallocene catalyst has less stickiness and enables effective gelation during crosslinking. Chemical resistance can be increased. The ethylene copolymer (A) can be produced by any known polymerization method such as solution polymerization, gas phase polymerization, and slurry polymerization.
[0014]
  Examples of the propylene polymer (B) used in the present invention include a propylene homopolymer, a propylene-α-olefin random copolymer, a propylene-α-olefin block copolymer, and the like. As an α-olefin,An α-olefin having 3 to 20 carbon atoms;For example, propylene, 1-butene, 1-pentene, 3-methyl-1-butene, 1-hexene, 4-methyl-1-pentene, 3-methyl-1-pentene, 1-heptene, 1-octene, 1- Decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicoseneEtc.Can be mentioned. 1 type may be sufficient as the alpha olefin used as a comonomer, and it may use 2 or more types together. The polypropylene content in the propylene polymer (B) is 80% by weight or more, preferably 85% by weight or more. When the polypropylene content is less than 80% by weight, the heat resistance is lowered.
[0015]
The propylene polymer (B) is produced by a known method. For example, a Ziegler-Natta catalyst, a metallocene catalyst, or the like is used as the catalyst, and the catalyst is produced by a known process such as a batch method, a gas phase method, or a slurry method.
[0016]
The melting point of the propylene polymer (B) is usually 80 ° C. or higher, preferably 120 ° C. or higher, and the upper limit is usually 165 ° C. from the viewpoint of the release agent and heat resistance. When the melting point is less than 80 ° C., the heat resistance of the propylene-based polymer (B) decreases due to the closeness to the melting point of the ethylene-based copolymer (A) described above.
[0017]
In order to control the melting point of the propylene polymer (B), a method of changing the amount and type of α-olefin copolymerized with propylene, and control of the stereoregularity distribution and positional isomerism of propylene in the propylene homopolymer A method for controlling the crystallization speed by adding a component that is compatible with the propylene polymer (B) such as a norbornene polymer, a method for changing the crystallization system and the crystallization start temperature using a crystallization nucleating agent, etc. Various methods can be used.
[0018]
  The weight average molecular weight of the propylene polymer (B) is1× 10⁴Or more, preferably 3 × 10⁴That's it. Weight average molecular weight is 1 × 10⁴If it is less than 1, the mechanical strength of the release agent is reduced, and when the release layer made of this release agent is peeled off from the adhesive layer, the release becomes poor, or the release layer partially becomes an adhesive layer. May remain.
[0019]
In the present invention, a functional group can be imparted to the ethylene copolymer (A) and / or the propylene polymer (B) in order to obtain a release agent having excellent substrate adhesion. Functional groups include epoxy groups, acid anhydride groups, carboxyl groups, hydroxyl groups, amino groups, isocyanate groups, trimethoxysilyl groups and other reactive functional groups, vinyl groups, isopropenyl groups, and (meth) acrylate groups. And groups having an unsaturated bond such as an allyl group.
[0020]
The functional group may be imparted according to a conventional method such as an addition reaction of a monomer having a functional group with the ethylene copolymer (A) and / or the propylene polymer (B) in the presence of peroxide. As the peroxide, known ones such as ketone peroxide, hydroperoxide and diacyl peroxide are used. The amount of the functional group is usually 10 mol% or less, preferably 5 mol% or less. When there are too many functional groups, there exists a possibility that the mold release property of a mold release agent may be impaired.
[0021]
The release agent of the present invention contains the ethylene copolymer (A) and the propylene polymer (B) as essential components, but may further contain other additional components. When a functional group is imparted to the ethylene copolymer (A) and / or the propylene polymer (B), as an additional component, for example, a crosslinking agent, that is, a functional group that reacts with the functional group of the above-described polyolefin is used. The compound which has two or more is mentioned. The use ratio of such a crosslinking agent is usually 0.1 to 10, preferably 0.5 to 2, as the molar ratio of the functional group of the polyolefin / the functional group of the crosslinking agent. When the molar ratio of the functional groups is outside this range, the number of remaining unreacted functional groups increases, and the mold release property generally decreases. Examples of other additional components include an anti-blocking agent, an antioxidant, a pigment, an ultraviolet absorber, a filler, and an anti-aging agent.
[0022]
The release agent of the present invention can be produced by blending various additional components as desired in the ethylene copolymer (A) and the propylene polymer (B), and dissolving or melting and kneading them in a solvent. . The weight ratio of the ethylene copolymer (A) and the propylene polymer (B) is 40:60 to 90:10, preferably 40:60 to 80:20. When the proportion of the propylene-based polymer (B) is less than the above range, the peel strength from the adhesive and the heat resistance of the release agent are reduced, and when it exceeds the above range, the heat resistance of the release agent is excellent. The peel force increases.
[0023]
Next, the adhesive laminate and the adhesive laminate tape of the present invention will be described. The pressure-sensitive adhesive laminate of the present invention is a pressure-sensitive adhesive laminate comprising an adhesive layer and a release layer, wherein the release layer is made of the above-mentioned release agent. And it uses for the adhesive laminated tape of various aspects using a base material suitably.
[0024]
<Adhesive laminated tape-1>
In this embodiment, an adhesive laminate is provided on a substrate so that the adhesive layer and the substrate are adjacent to each other. That is, the layer structure is substrate / adhesive layer / release layer. In use, the release layer may be peeled off to expose the adhesive layer surface and adhere to the object.
[0025]
<Adhesive laminated tape-2>
In this embodiment, an adhesive laminate is provided on a substrate such that the release layer and the substrate are adjacent to each other, and an adhesive layer substrate is provided on the adhesive layer side of the adhesive laminate. That is, the layer configuration is substrate / release layer / adhesive layer / substrate. In use, the substrate and the release layer may be peeled off to expose the adhesive layer surface and adhere to the object.
[0026]
<Adhesive laminated tape-3>
In this embodiment, the adhesive laminate is provided so that the base material and the adhesive layer are adjacent to each other on both surfaces of the adhesive layer base material. That is, the layer configuration is release layer / adhesive layer / base material / adhesive layer / release layer. In use, the release layer covering one adhesive layer is peeled off, the outer surface of the adhesive layer is exposed and adhered to one object, and then the release layer covering the other adhesive layer is exposed. By peeling the mold layer and exposing the outer surface of the adhesive layer to adhere to the other object, it can be used as a double-sided adhesive tape that adheres two objects to each other.
[0027]
<Adhesive laminate tape-4>
In this embodiment, a release layer is provided on the surface of the adhesive layer of the adhesive laminate. That is, the layer structure is release layer / adhesive layer / release layer. In use, one release layer is peeled off to expose one surface of the pressure-sensitive adhesive layer to adhere to one object, and then the other release layer is peeled off to expose the other surface of the pressure-sensitive adhesive layer. It can be used as a double-sided pressure-sensitive adhesive tape that adheres two objects to each other.
[0028]
<Adhesive laminated tape-5>
In this embodiment, the pressure-sensitive adhesive laminate is not used, but a pressure-sensitive adhesive layer is provided on one surface of the substrate, a release layer is provided on the other surface, and wound into a roll to obtain a pressure-sensitive adhesive laminated tape roll. . That is, the layer structure is adhesive layer / base material / release layer. Since the release layer has adhesiveness to the base material, in use, it may be rewound and peeled off at the interface between the adhesive layer and the release layer to expose the adhesive layer surface and adhere to the object.
[0029]
In any of the above-structured adhesive laminated tapes, the release layer can be made thick by increasing the thickness of the release layer or by using the release layer integrally with a release layer base material having adhesiveness. The mechanical strength at the time of peeling the layer can be ensured.
[0030]
Also, in the case of the adhesive laminated tape of any configuration, the release layer base material is used as a release layer, and the adhesive layer base material is used as an integrated adhesive layer, if necessary. Adhesiveness and mechanical strength with a mold release agent are required for a substrate for an adhesive, and adhesiveness and mechanical strength with an adhesive are required for an adhesive layer substrate. The base material used for the above-mentioned pressure-sensitive adhesive laminated tape roll also serves as a release layer base material and an adhesive layer base material.
[0031]
As a base material used for the adhesive laminated tape including the adhesive laminated tape wound body, a conventional one, for example, polyester such as polyethylene terephthalate and polybutylene terephthalate, polyolefin such as polypropylene, polyethylene and polymethylpentene, polycarbonate, etc. A film made of the above resin, glassine paper, high-quality paper, coated paper, impregnated paper, synthetic paper or the like, and metal foil such as aluminum or stainless steel may be used. The thickness of a base material is 10-100 micrometers normally, Preferably it is 25-50 micrometers.
[0032]
The base material may be subjected to corona treatment, plasma treatment, flame plasma treatment, or a primer layer in order to improve adhesion to the adhesive layer or the release layer. As the primer layer, a polymer material (so-called anchor coat agent) such as polyethylene, polypropylene, styrene copolymer, polyester, polyurethane, polyvinyl alcohol, polyethyleneimine, polyacrylate, polymethacrylate, and modified products thereof is used. I can do it.
[0033]
In the production of the tape, the adhesive layer and the release layer may be formed by a conventional method. Usually, the release layer is coated with a release agent on the base material, melt-extruded from the extruder into a sheet and laminated on the base material, or the base material and release agent are extruded. It is formed by coextrusion from a machine.
[0034]
As the pressure-sensitive adhesive, those generally referred to as acrylic, rubber-based, polyurethane-based, silicon-based, and the like are mainly used, but other pressure-sensitive adhesives can also be used. The pressure-sensitive adhesive layer is formed by applying the pressure-sensitive adhesive as it is or as a solution on the base material or the release layer provided on the base material, transfer coating the pressure-sensitive adhesive layer coated on another base material, It can be formed by co-extruding the raw material, release agent and pressure-sensitive adhesive with an extruder.
[0035]
In the production of a laminate, it is excellent in terms of productivity to simultaneously melt and extrude a plurality of layers such as co-extrusion of a base material layer and a release layer.
[0036]
When the release layer is formed by melt extrusion, the melt index of the release agent at 230 ° C. and 2.16 kgf is usually 0.5 to 40 g / 10 minutes, preferably 1 to 20 g / 10 minutes. . Extrusion moldability is reduced whether the melt index is larger or smaller.
[0037]
In the case of coextrusion molding of the base material and the release layer, and further, the base material, the release layer and the adhesive layer, it is continuously stretched uniaxially or biaxially to reduce the thickness and improve the strength. You can also make it. The draw ratio is usually 2 to 10 times. The thickness of the release layer is usually 0.5 to 150 μm, preferably 0.5 to 10 μm, more preferably 0.5 to 5 μm. When the thickness of the release layer is too thin, it is difficult to ensure the uniformity of the thickness, and when it is too thick, the elastic modulus of the laminate is lowered.
[0038]
【Example】
EXAMPLES Hereinafter, although this invention is demonstrated further in detail by implementation, this invention is not limited to a following example, unless the summary is exceeded. In addition, the measuring method of the physical property in an Example was performed with the following method.
[0039]
(1) Evaluation of releasability at room temperature:
After preparing an adhesive laminated tape, it is stabilized by curing at 25 ° C. and 50 RH for 72 hours. Next, the adhesive laminated tape was cut to a width of 25 mm and a length of 150 mm, the back surface of the substrate adjacent to the adhesive layer was fixed to a stainless steel plate, and 300 mm / 50 ° C. and 50 RH atmosphere using a peeling tester. The interface between the release layer and the adhesive layer is peeled 180 degrees at a pulling rate of min, and the force at that time (normal peel force) is measured. The result was displayed as an average value of five measurements. The smaller the normal peel force, the easier the release from the adhesive layer and the better the releasability at room temperature.
[0040]
(2) Evaluation of releasability under heating:
After preparing an adhesive laminated tape, it is stabilized by curing at 25 ° C. and 50 RH for 72 hours. Next, 20 g / cm of the adhesive laminated tape²Hold under load at 100 ° C. for 1 hour. Next, after cooling at room temperature, the adhesive laminated tape was cut to a width of 25 mm and a length of 150 mm, the back surface of the substrate adjacent to the adhesive layer was fixed to a stainless steel plate, and a peeling tester was used, The interface between the release layer and the pressure-sensitive adhesive layer is peeled 180 degrees at a pulling speed of 300 mm / min in an atmosphere of 50 RH. The force (heat peeling force) at that time is measured. The result was displayed as an average value of five measurements. The smaller the heat release force, the easier the release from the adhesive layer and the better the releasability under heating.
[0041]
Moreover, what was described below was used as an ethylene-type copolymer (A), a propylene-type polymer (B), and an adhesive. These molecular weights and melting points were measured by the following method.
[0042]
(3) Molecular weight:
Calculation was performed by gel permeation chromatography using a calibration curve prepared with standard polystyrene. The measurement conditions are as shown in Table 1 below.
[0043]
[Table 1]
Model: Waters, GPC150C
Solvent: Orthodichlorobenzene
Temperature: 140 ° C
Injection concentration: 0.1% by weight
Injection volume: 200 μl
Flow rate: 1.0 ml / min
Detector: IR. Wavelength 3.42 μm
Column: Showa Denko, AD806MS
Column size: 30cm x 3
Calculation method of molecular weight: Calculated as molecular weight of linear polyethylene by universal calibration method
[0044]
(4) Measurement of melting point:
Using a DSC “DSC-7” manufactured by PerkinElmer, the measurement was performed as follows. That is, first, after pre-incubation at 200 ° C. for 10 minutes, it is cooled to −20 ° C./min to 20 ° C. and is incubated for 5 minutes. Next, the temperature is raised at 20 ° C./min. The endothermic peak position of the DSC peak that accompanies melting during this temperature raising process is taken as the melting point. The measurement was performed in a nitrogen atmosphere, and the sample weight was 7 mg.
[0045]
(EP1)
It is an ethylene-propylene copolymer produced using a metallocene catalyst. The composition determined by H-NMR was ethylene / propylene = 74/26 (weight ratio), the weight average molecular weight determined by GPC was 97,000, the ratio of the weight average molecular weight to the number average molecular weight was 2.3, and the density was 0.3. It was 863 g / cc and MFR was 3.2 g / 10 minutes.
[0046]
(EP2)
It is an ethylene-propylene copolymer produced using a metallocene catalyst. The composition determined by H-NMR is ethylene / propylene = 73/27 (weight), the weight average molecular weight determined by GPC is 71000, the ratio of the weight average molecular weight to the number average molecular weight is 2.1, and the density is 0.865 g. / Cc, MFR was 6 g / 10 min.
[0047]
(EP3)
An ethylene-hexene random copolymer produced using a metallocene catalyst. The composition determined by H-NMR was ethylene / hexene = 90/10 (molar ratio), the weight average molecular weight determined by GPC was 70100, the ratio of the weight average molecular weight to the number average molecular weight was 2.3, and the density was 0.3. 880 g / cc and MPR were 3.5 g / 10 minutes.
[0048]
(EP4)
After mixing EP1: 100 parts by weight, 2-hydroxyethyl methacrylate: 3 parts by weight, 2,5-dimethyl-2,5-di-ter-butyl peroxide: 0.15 parts by weight, and then laboplast mill kneading. It is a modified ethylene-hexene random copolymer having a hydroxyl group, obtained by kneading at 180 ° C. for 3 minutes at a rotation speed of 60 rpm in a nitrogen atmosphere using a machine (manufactured by Toyo Seiki Co., Ltd.). 1724cm by FT-IR spectrum^{− 1}The content of 2-hydroxyethyl methacrylate estimated from the measured value of the characteristic absorption strength of the carbonyl group was 0.9% by weight. The density was 0.881 g / cc and the MFR was 4.2 g / 10 minutes.
[0049]
(PP1)
Propylene was polymerized using a metallocene catalyst. The weight average molecular weight determined by GPC was 394400, and the ratio of the weight average molecular weight to the number average molecular weight was 2.4. The melting point was 155 ° C.
[0050]
(PP2)
Propylene and ethylene (weight ratio 97.4: 2.6) were polymerized using a Ziegler-Natta catalyst. The weight average molecular weight determined by GPC was 397,000, and the ratio of the weight average molecular weight to the number average molecular weight was 4.2. The melting point was 123 ° C.
[0051]
(PP3)
Propylene and ethylene (94.0: 6.0 weight ratio) were polymerized using a Ziegler-Natta catalyst. The weight average molecular weight determined by GPC was 210,000, and the ratio of the weight average molecular weight to the number average molecular weight was 5.3. The melting point was 109 ° C.
[0052]
(Polyacrylic acid ester adhesive A)
100 parts by weight of n-butyl acrylate and 5 parts by weight of acrylic acid are dissolved in toluene, polymerized by a conventional method using benzoyl peroxide, and a solution of an acrylic polymer having a weight average molecular weight of about 500,000 (solid content 50 % By weight). Ethyl acetate was added thereto so that the solid content was 30%, and then 3 parts by weight of an isocyanate-based crosslinking agent was added per 100 parts by weight of the acrylic polymer to obtain a polyacrylate-based pressure-sensitive adhesive A.
[0053]
Example 1
Propylene polymer 1 (PP1) and ethylene propylene copolymer 1 (EP1) were blended at a weight ratio shown in Table 1, and kneaded using a twin-screw extruder at 210 ° C. and an average residence time of 3 minutes. A mold was prepared. This release agent was extruded from a T-die molding machine at 220 ° C. to obtain a release sheet consisting only of a release layer. The thickness of the release sheet was 50 μm.
[0054]
Using an applicator (made by Dazai Equipment Co., Ltd .: for 100 μm), a polyacrylic acid ester-based adhesive solution at 23 ° C. on a 25 μm thick polyester film so that the thickness of the coating solution is 100 μm and the width is 8 cm. A was applied. After 2 seconds from the application, the coating was dried for 2 minutes in a dryer heated to 80 ° C. (manufactured by Satake Chemical Equipment Co., Ltd .: Safe Ben dryer N50S5). Then, it took out and cooled to room temperature, and obtained the adhesive sheet which consists of an adhesion layer and a base material.
[0055]
Next, 2 minutes after cooling to room temperature, the above-mentioned pressure-sensitive adhesive sheet is placed on the above-mentioned release sheet, and then a 2 kg roller is reciprocated once at a speed of 30 cm / min, whereby the pressure-sensitive adhesive layer and the release layer Was crimped. Thereby, the adhesive lamination tape 1 laminated | stacked in order of the mold release layer, the adhesion layer, and the base material was produced.
[0056]
Nitto Denko Corporation: N502 tape was used as an adhesive sheet, placed on the release sheet, and then a 2 kg roller was reciprocated once at a speed of 30 cm / min to bond the adhesive layer and the release layer together. Thereby, the adhesive lamination tape 2 laminated | stacked in order of the mold release layer, the adhesion layer, and the base material was produced.
[0057]
Examples 2-6
A propylene polymer and an ethylene α-olefin polymer were blended at a weight ratio shown in Table 1 and kneaded at 230 ° C. and an average residence time of 3 minutes using a twin screw extruder to produce a release agent.
[0058]
From a T-die molding machine, LLDPE (density 0.93 g / cc, melt index 2.0 g / 10 min) and an equal weight blend of a release agent-containing propylene polymer and the above release agent are coextruded at 240 ° C., A release sheet comprising a substrate and a release layer was obtained. The thickness of the substrate was 25 μm, and the thickness of the release layer was 4 μm.
[0059]
In Example 6, during the production of the release agent, a zeolite-based antiblocking agent (average particle size 2 μm) was blended to 2 parts by weight with respect to 100 parts by weight of the release agent.
[0060]
Using an applicator (manufactured by Dazai Equipment Co., Ltd .: for 100 μm), the polyacrylate adhesive solution A is applied onto a 25 μm thick polyester film so that the thickness of the coating solution is 100 μm and the width is 8 cm. Application was at 23 ° C. After 2 seconds from the coating, the coating was dried for 2 minutes in a dryer heated to 80 ° C. (manufactured by Satake Chemical Equipment Co., Ltd .: Safe Ben dryer N50 S5). Then, it took out and cooled to room temperature, and obtained the adhesive sheet which consists of an adhesion layer and a base material.
[0061]
Next, 2 minutes after cooling to room temperature, the adhesive sheet is placed on the release sheet, and from there, a 2 kg roller is reciprocated once at a speed of 30 cm / min. Was crimped. Thereby, the adhesive lamination tape laminated | stacked in order of the base material, the mold release layer, the adhesion layer, and the base material was prepared.
[0062]
Nitto Denko Corporation: N502 tape was used as an adhesive sheet, placed on the release sheet, and then a 2 kg roller was reciprocated once at a speed of 30 cm / min to bond the adhesive layer and the release layer together. Thereby, the adhesive lamination tape 2 laminated | stacked in order of the mold release layer, the adhesion layer, and the base material was produced.
[0063]
Example 7
The propylene polymer shown in Table 1 and the functional group-modified ethylene 1-hexene copolymer (EP-4) are dissolved in toluene heated to 60 ° C., and then cooled to a 2 wt% toluene solution of a release agent. Was prepared. Release agent containing a crosslinking agent by adding “NY718A” (76% by weight butyl acetate solution of trifunctional isocyanate in which 3 mol of aliphatic diisocyanate is added to 1 mol of triol) manufactured by Mitsubishi Chemical Corporation to this release agent solution An agent solution was prepared. This solution contains a crosslinking agent in an amount such that 1.1 equivalents of isocyanate groups with respect to 2-hydroxyethyl methacrylate contained in polyolefin (PE-3).
[0064]
The above toluene solution was applied onto a polyester film having a thickness of 25 μm so that the thickness after drying was 0.1 μm, and dried in an atmosphere at 150 ° C. for 1 minute to obtain a release sheet.
[0065]
Next, on the release layer of the release sheet, the polyacrylate pressure-sensitive adhesive solution A is applied so that the thickness after drying becomes 40 μm, and dried at 80 ° C. for 5 minutes. Formed. A polyester film having a thickness of 25 μm was bonded to the adhesive layer as a base material to prepare an adhesive laminated tape 1 in which the base material, the release layer, the adhesive layer, and the base material were laminated in this order. Moreover, the adhesive laminated tape 2 was produced similarly to Example 2.
[0066]
Comparative Examples 1-3
Adhesive laminated tapes 1 and 2 were obtained in the same manner as in Example 1 except that the composition shown in Table 1 was used as a release agent.
[0067]
Comparative Example 4
As in Example 2, except that ethylene α-olefin copolymer (EP1) was used as a release agent and the base material was only LLDPE (density 0.93 g / cc, melt index 2.0 g / 10 min). Thus, adhesive laminated tapes 1 and 2 were prepared in which the substrate, the release layer, the adhesive layer, and the substrate were laminated in this order.
[0068]
[Table 2]

[0069]
【The invention's effect】
According to the present invention described above, it does not contain a silicone gas generating component, has good releasability with respect to various pressure-sensitive adhesives, has a small variation in peeling force, and is bonded to the pressure-sensitive adhesive under heating. Thus, a release agent capable of maintaining a low peeling force even after being placed on the surface is provided, and the industrial value of the present invention is remarkable.

Claims (7)

Produced using a metallocene catalyst and ethylene with one or more α- olefins (but limited to the α- olefins having 3 to 20 carbon atoms) formed Ri the α- olefin content only to have 1 to 25 mol% Oh Ru the ethylene polymer (a), a weight average molecular weight of 1 × 10 ⁴ or more and a polypropylene content of 80 wt% or more (provided that a case having a copolymerization component having 3 to 20 carbon atoms α- A propylene polymer (B) ( limited to one or more olefins ), and the weight ratio of the ethylene copolymer (A) and the propylene polymer (B) is 40:60 to 90:10. Release agent characterized. The mold release agent according to claim 1, wherein the α-olefin other than ethylene constituting the ethylene copolymer (A) is at least one of propylene, butene, hexene, and octene. The mold release agent according to claim 1 or 2, wherein the propylene polymer (B) has a melting point of 80 ° C or higher. The ethylene-based copolymer (A) and / or the propylene-based polymer (B) has a functional group and further contains a reactive compound (C) capable of reacting with the functional group. 4. The release agent according to any one of 3. An adhesive laminate comprising an adhesive layer and a release layer, wherein the release layer comprises the release agent according to any one of claims 1 to 4. An adhesive laminate tape in which an adhesive layer of an adhesive laminate comprising an adhesive layer and a release layer is provided on at least one surface of the substrate so as to be in contact with the substrate, and the release layer is claimed in claims 1 to 4. A pressure-sensitive adhesive laminated tape comprising the release agent according to any one of the above. It is the adhesive laminated tape laminated | stacked in order of the base material, the mold release layer, the adhesive layer, and the base material for adhesive layers, Comprising: A mold release layer consists of a mold release agent in any one of Claims 1-4. An adhesive laminated tape characterized by that.