JP2007301927A - Laminated base-material with mold release layer, and adhesive tape using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated body with a mold release layer that does not include a silicone-based generated-gas component and a VOC generating component adversely affecting on the state in an environmental atmosphere, has excellent peelability with respect to an adhesive, has small changes with time and speed variations in peel force, prevents accelerated deterioration in adhesive force when made into an adhesive tape, and enables writing even onto the surface of the mold release layer, and the adhesive tape using the same. <P>SOLUTION: A laminated base-material with a mold release layer 14 is composed so that the mold release layer 14 includes: a copolymer (A) composed of a metallocene-based catalyst made of ethylene with a density of ≥0.90 and <0.916 and a 3-12C α-olefin; and a copolymer (B) composed of ethylene with a density of ≥0.87 and <0.90 and the 3-12C α-olefin at specific proportions on one side of a base material 13. The adhesive tape is manufactured by using the laminated base-material with a mold release layer. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a laminated base material having a release layer with good releasability and an adhesive tape using the same.

In the pressure-sensitive adhesive tape or pressure-sensitive adhesive sheet, a pressure-sensitive adhesive layer provided on the surface of the substrate and a release layer are provided on the other surface.
In this technical field, a laminate having a release layer with good peelability provided on a substrate is required.
The release agent used in this release layer is roughly classified into a silicone release agent and a non-silicone release agent.

  Silicone release agents are generally expensive although they are excellent in releasability. Further, it is often applied by dissolving in an organic solvent. In this coating, there is a concern that VOC (volatile organic compound) is generated by the silicone mold release agent and the organic solvent used. In addition, due to its excellent releasability, it has been a problem that the adhesive tape cannot be overlaid, and it is impossible to write on the release surface.Recently, when used for electronic devices such as hard disk drives, It has been pointed out that failure of electronic equipment (corrosion, contact trouble, etc.) due to a small amount of silicone gas becomes a problem.

On the other hand, examples of the non-silicone release agent include a release agent whose surface energy is reduced by a halogen compound such as fluoride, and a polyvinyl carbamate which is a long chain alkyl group-containing polymer (reaction product of PVA and C ₁₈ H ₃₇ NCO). A mold release agent comprising a reaction product of polyethyleneimine and C ₁₈ H ₃₇ NCO, a mold release agent comprising a copolymer based on perfluoroalkyl vinyl, and a mold release agent comprising a polyethylene resin composition. Molds have been proposed.

  For example, mold release agents whose surface energy has been reduced by halogen compounds such as fluoride are in the current trend of being required to reduce the environmental burden and require dehalogenation in order to generate halogen during waste treatment. Absent. In addition, a release agent composed of a copolymer mainly composed of perfluoroalkylvinyl has excellent release properties, but is insoluble in general organic solvents and only soluble in special and expensive solvents such as FR thinner. However, there are problems in that the use is greatly limited and harmful VOCs are generated during the manufacturing process.

From the above, it is general to use a polyethylene resin composition as the release agent. In a mold release agent using a polyethylene resin composition, a mold release agent mainly composed of a low density polyethylene resin (for example, see Patent Documents 1 and 2), a mold release agent mainly composed of a high density polyethylene resin ( For example, see Patent Documents 3 and 4). The release agent mainly composed of the low-density polyethylene-based resin has poor peelability, and when used as an adhesive tape, a part of the adhesive layer may move to the release layer surface during rewinding. On the other hand, the release agent mainly composed of a high-density polyethylene resin has poor adhesion to a base material mainly composed of a polar polymer, has a large unwinding force, and is not at a satisfactory level. . Both have problems and there is a strong demand for improvement of these characteristics.
Japanese Patent Publication No.51-20205 Japanese National Patent Publication No. 11-508958 JP 2000-239624 A JP 2000-119411 A

  The problem of the present invention is that, as a release agent used in a release layer formed on a substrate, generation of a silicone-based gas component that adversely affects electronic components and use of an organic solvent that adversely affects the atmosphere Without selecting a material with VOC generation, it has good releasability with respect to the adhesive and has little change in the peel force over time and speed. There is provided a laminate having a release layer that can be written on the surface of the release layer and an adhesive tape using the same.

As a result of intensive studies in order to solve the above problems, the present inventor found the following and completed the present invention.
Acquired knowledge that ethylene and α-olefin copolymer of specific density and structure and ethylene and α-olefin copolymer of specific density and structure can be mixed and used. Thus, the present invention has been completed.

  A laminate comprising a release layer formed on a substrate is a release layer that can be easily peeled off from the pressure-sensitive adhesive, and the release layer has an ethylene density of 0.90 or more and less than 0.916. And a copolymer (A) obtained by copolymerizing an α-olefin having 3 to 12 carbon atoms with a metallocene catalyst, ethylene having a density of 0.87 or more and less than 0.90, and 3 to 12 carbon atoms The said subject can be solved by using the mixture which has an alpha olefin copolymer (B) as a main component.

  In particular, the mixture forming the release layer is composed of a copolymer (A) based on a metallocene catalyst of ethylene and an α-olefin having 3 to 12 carbon atoms, an ethylene and α-olefin having 3 to 12 carbon atoms. The weight ratio with respect to the polymer (B) is preferably in the range of 90:10 to 50:50.

  The laminate having a release layer formed on the substrate of the present invention and the pressure-sensitive adhesive tape using the laminate are originally used as a material for forming the release layer. It does not contain VOC-generating components such as organic solvents that adversely affect the atmosphere in the atmosphere, and the release layer used has good peelability with respect to the pressure-sensitive adhesive, and the peeling force varies with time and speed. It is small and does not have a reduced adhesive strength after promotion when it is made into an adhesive tape, and has sufficiently excellent properties as a release layer that can be written on the surface of the release layer.

The laminated base material of the present invention is provided with a release layer on one side of the base material, and the release layer has a density of 0.90 or more and less than 0.916, ethylene and an α- having 3 to 12 carbon atoms. It contains a copolymer (A) of an olefin and a metallocene catalyst, and an α-olefin copolymer (B) having a density of 0.87 or more and less than 0.90 and having 3 to 12 carbon atoms. A laminated substrate having a release layer.
The copolymers (A) and (B) are described below.

  The weight ratio of the copolymer (A) by the metallocene-based catalyst of ethylene and an α-olefin having 3 to 12 carbon atoms and the ethylene and α-olefin copolymer (B) having 3 to 12 carbon atoms, It is effective that it is 90: 10-50: 50.

(A) Details of the copolymer (A) of a metallocene catalyst of ethylene and an α-olefin having 3 to 12 carbon atoms, having a density of 0.90 or more and less than 0.916 are as follows.
The α-olefin used in this copolymer is as follows. 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 and the like can be mentioned.

  The copolymer (A) is a copolymer of ethylene and α-olefin using a metallocene catalyst. When a metallocene-based catalyst is used, the molecular weight distribution of the resulting polymer is narrow, the content of polyolefin, which is a low molecular weight component contained in the copolymer, is small, and the copolymer is uniform. Is obtained. In addition, the comonomer component obtained also suppresses the formation of components significantly different from the average composition. Moreover, it does not specifically limit as a manufacturing method of this copolymer, Solution polymerization, vapor phase polymerization, slurry polymerization, high pressure polymerization, block polymerization, etc. are employable. Regardless of whether the raw material monomer type is gas or liquid, the polymerization method may be performed by encapsulating the monomer in advance in the polymerization system and feeding the monomer at a constant speed during the polymerization, or by adjusting the pressure in the polymerization system. The monomer may be fed so as to keep it constant. In addition, in order not to inhibit the effect of the present invention, in order to improve the adhesion to the base material, a functional group such as an epoxy group, a carboxyl group, a hydroxyl group, an amino group, or a vinyl group is used. It is also possible.

  Specific examples of the metallocene catalyst used include rac-isopropylidenebis (1-indenyl) zirconium dichloride, rac-dimethylsilylbis-1- (2-methylindenyl) zirconium dichloride, rac-dimethylsilylbis-1- ( 2-methyl-4-phenylindel) zirconium dichloride, rac-dimethylsilylbis-1- (2-methyl-4,5-benzoindenyl) zirconium dichloride, isopropylidene-9-fluorenylcyclopentadienylzirconium A dichloride etc. can be mentioned.

(B) The details of ethylene and the α-olefin copolymer (B) having 3 to 12 carbon atoms and having a density of 0.87 or more and less than 0.90 are as follows. Representative examples of α-olefins include propylene, 1-butene, 1-pentene, 3-methyl-1-butene, 1-hexene, 4-methyl-1-pentene, 3-methyl-1-pentene and 1-heptene. , 1-octene, 1-decene, 1-dodecene and the like.
The copolymer (B) is a copolymer of these α-olefin and ethylene. In general, the density of the polymer depends on crystallinity, the density of the crystallized portion of the polymer is high, and in the case of ethylene-α-olefin, the crystalline component is polyethylene. The amount of α-olefin contained in the ethylene-α-olefin copolymer of the component (B) that brings about the peelability effect of the present invention is generally 15 to 75 mol%, preferably 25 to 65 mol%. It is a range. If the density of the component (B) is too small, the heat resistance and strength of the resulting release agent layer, the aging and the peelability after acceleration will be insufficient, and if the density is too large, the initial peel force itself obtained will be It tends to be too large, and sufficient peelability cannot be obtained. Component (A) is richer in crystallinity than component (B).
In general, the density of the polymer depends on crystallinity, the density of the crystallized portion of the polymer is high, and in the case of ethylene-α-olefin, the crystalline component is polyethylene. In the case of component (A), the amount of ethylene contained in the ethylene-α-olefin copolymer is generally 75 mol% or more, preferably 85 to 99 mol%. If the density of the component (A) is too small, the heat resistance and strength of the obtained release agent layer will be insufficient, and if the density is too large, the resulting peeling force tends to be too large, and sufficient peelability is obtained. I can't get it. As will be described later, when the polyethylene component is 100%, the ethylene-α-olefin copolymer having a relatively high α-olefin content, which is a component (B) that contributes particularly to the peelability, is a phase with polyethylene. Poor solubility, bleeding out to the surface, and after promoting wet heat aging after forming an adhesive tape, there is a problem that causes a decrease in adhesive strength.

  In the present invention, an ethylene copolymer produced using a metallocene catalyst is particularly preferable. Metallocene-based catalysts provide 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. . Moreover, it does not specifically limit as a manufacturing method of this copolymer, You may use solution polymerization, vapor phase polymerization, slurry polymerization, high pressure polymerization, block polymerization, etc. Regardless of whether the monomer species is a gas or a liquid, the polymerization method may be such that the monomer is encapsulated in advance in the polymerization system, and the monomer is fed at a constant rate during the polymerization, or the pressure in the polymerization system is kept constant. The monomer may be fed so as to maintain the same. In addition, in order not to inhibit the effect of the present invention, in order to improve the adhesion to the base material, a functional group such as an epoxy group, a carboxyl group, a hydroxyl group, an amino group, or a vinyl group is used. It is also possible.

  These ethylene copolymers preferably have a melt flow rate of 0.1 to 50 g / 10 minutes measured at a temperature of 190 ° C. and a load of 21.18 N in accordance with JIS K7210. Particularly preferred is 40 g / 10 min.

The release layer of the present invention comprises a copolymer (A) component of a metallocene catalyst of ethylene and an α-olefin having 3 to 12 carbon atoms, and an α-olefin copolymer having 3 to 12 ethylene and carbon atoms. (B) The weight ratio with a component is obtained by mixing 90: 10-50: 50.
When the proportion of the component (B) is less than 10%, the peelability is inferior, and when it exceeds 50%, the heat resistance and the strength are insufficient. Therefore, it is preferable to blend in the above weight ratio range. As a more preferable formulation, the weight ratio of the component (A) to the component (B) is in the range of 80:20 to 60:40.

  The release layer forming method of the present invention is formed by dissolving the release agent of the above-mentioned formulation in an appropriate organic solvent such as toluene or hexane, and applying and drying on one side of the substrate. Alternatively, it may be formed by a method of laminating on a base material in a state of being melted by heat, or may be formed by co-extrusion together with the base material.

  The thickness of the release layer is not particularly specified, but it is usually desirable to form it in the range of 0.5 to 50 μm. If it is less than 0.5 μm, the strength of the release layer is weak, and the release layer may be peeled off from the substrate. Moreover, when it exceeds 50 micrometers, it becomes disadvantageous in terms of cost.

  In addition, the release agent layer of the present invention may contain other polyolefin-based resins and rubbers in addition to the above components as long as the essence of the invention is not impaired. Various additives used, for example, antioxidants, light stabilizers, ultraviolet absorbers, lubricants, antiblocking agents, dispersants, flame retardants, colorants, fillers, antistatic agents and the like may be added. .

The base material is not limited as long as it is a material having a function of supporting the release layer. For example, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyolefins such as polypropylene and polymethylpentene, plastic films such as polycarbonate, aluminum , Metal foils such as stainless steel, glassine paper, fine paper, coated paper, impregnated paper, synthetic paper, non-woven fabrics such as polyester, polypropylene, polyamide, polyolefin, polyester, polyamide, polyacryl, rayon, acetate, etc. And woven fabrics composed of one or more kinds of natural fibers such as cotton, wool and hemp.
This base material can be used as a base material of an adhesive tape.

  The substrate may be subjected to corona treatment, plasma treatment, flame treatment, primer treatment or the like in order to improve the adhesion to the release agent layer or the pressure-sensitive adhesive layer.

  As the pressure-sensitive adhesive layer, rubber-based, acrylic-based, urethane-based, and silicon-based pressure-sensitive adhesives are usually used. These pressure-sensitive adhesives can be applied directly on the substrate or applied to release paper. Then, it can be formed by a method of transferring the adhesive to the substrate.

  Among the above-mentioned pressure-sensitive adhesives, acrylic pressure-sensitive adhesives are most preferably used as those that are rich in low outgassing properties, adhesion reliability, and durability for various electronic devices.

  The acrylic pressure-sensitive adhesive is mainly composed of an acrylic polymer obtained by a conventional polymerization method such as a solution polymerization method, an emulsion polymerization method, or an ultraviolet polymerization method, and if necessary, a crosslinking agent, a tackifier, a softener, Various additives such as an anti-aging agent, a filler, a flame retardant, a colorant, and an antistatic agent can be added.

  Examples of the acrylic pressure-sensitive adhesive include methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, isoamyl (meth) acrylate, n-hexyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate. , Alkyl (meth) acrylates such as isooctyl (meth) acrylate, isononyl (meth) acrylate, decyl (meth) acrylate, dodecyl (meth) acrylate [preferably alkyl having about 2 to 12 carbon atoms in the alkyl group ( (Meth) acrylate] as a main component, and if necessary, a monomer for modification [for example, hydroxyl group-containing monomer such as hydroxyalkyl (meth) acrylate, cyano group-containing monomer such as acrylonitrile, acrylamide Such Amide group-containing monomers, vinyl esters such as vinyl acetate, aromatic vinyl compounds such as styrene, carboxyl group-containing monomers such as acrylic acid, etc.) are used. .

  The laminate and the pressure-sensitive adhesive tape having a release layer of the present invention do not contain a VOC-generating component such as a silicone-based gas component that adversely affects electronic components and an organic solvent that adversely affects the atmospheric environment, It has good releasability, has little change over time and speed in peel force, has no decrease in adhesive force after promotion when applied to an adhesive tape, and can be written on the surface of the release layer. The mold layer has sufficiently excellent characteristics.

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. In addition, the measuring method of the physical property in an Example was performed with the following method.
(Evaluation test of adhesive tape)
Adhesive force: The obtained adhesive tape (with a tape width of 25 mm) is performed in accordance with JIS-Z-0237. The adherend is SUS304, the peeling angle is 90 degrees, and the peeling speed is 300 mm / min. In addition, adhesive force is performed also about what accelerated | stimulated aging at 65 degreeC80% 3 days.
Unwinding force: The obtained roll-shaped adhesive tape (tape width: 25 mm) was performed according to JIS-Z-0237. The rewinding speed is two types of 300 mm / min and 30 M / min. In addition, the rewinding force is also performed for those that have been accelerated in aging at 65 ° C. and 80% for 3 days.

(Manufacturing method of substrate)
First, an outline of an example of a method for producing a substrate that supports an adhesive tape will be described. As a base fabric constituting the base material, a method described in publicly known patent No. 3555880 was used. Polyester multifilaments with a warp of 30 denier (strength 1.3N, elongation 28.5%) are knitted independently with 24 yarns / inch, and 300 denier high-density polyethylene flat yarn (strength 14.3N, A knitted fabric in which wefts having a degree of elongation of 28.4%) were inserted by insertion at a rate of 17 / inch was used as a base fabric. After applying a chemical treatment with an organic titanate (trade name “TBT” manufactured by Mitsubishi Gas Chemical Co., Ltd.) so that an adhesion amount of 0.2 g / m ² is formed on the front and back of the base fabric, the density is set as the first laminate layer. A low-density polyethylene resin [MFR (melt flow rate) = 8] of 0.924 was uniformly extruded from a T-die at 300 ° C. so as to be 35 g / m ^2, and the base fabric was laminated. Subsequently, as the second laminate layer, the low-density polyethylene resin is uniformly extruded from a T-die at 300 ° C. so as to be 35 g / m ^2, and the single-sided laminate base is opposite to the first laminate layer. A base material for an adhesive tape is prepared by laminating the base fabric side.

(Method for producing adhesive)
86.0 parts of 2-ethylhexyl acrylate, 1.5 parts of acrylic acid, 12.5 parts of methyl methacrylate, 0.028 part of 1-dodecanethiol as a chain transfer agent, an anionic reactive emulsifier (manufactured by Sanyo Chemical Industries) “Eleminol JS-2”) 3.2 parts and water 38 parts were mixed to obtain an emulsion composed of a monomer mixture.

  Next, 0.16 parts of a nonionic reactive emulsifier (Adeka Soap ER-20 manufactured by Asahi Denka Kogyo Co., Ltd.) and an anionic reactive emulsifier (manufactured by Sanyo Chemical Industries) "Eleminol JS-2") as 0.08 part, pH buffering agent, 0.5 part of dibasic sodium phosphate and 25.0 parts of water were charged, and the temperature was raised to 75 ° C with stirring. Of 7% was added. Furthermore, after raising the temperature to 80 ° C., 0.92 parts of 3% potassium persulfate aqueous solution was added to carry out emulsion polymerization, and then 10 minutes later, the remaining 93% of the above emulsion and 3% potassium persulfate aqueous solution were added. The liquid mixture which mixed 2.75 parts was dripped over 3.5 hours. After the completion of dropping, stirring was continued for 2 hours while maintaining the temperature at 80 ° C., followed by cooling to 60 ° C. and adding 0.25% of a 10% aqueous solution of tertiary butyl hydroperoxide (“Perbutyl H-69” manufactured by NOF Corporation). And 0.5 part of 5% aqueous sodium hydrogen sulfite solution were added and reacted for 15 minutes. Then, after cooling to 30 ° C., the pH was adjusted to 8.0 with a 10% aqueous ammonia solution and filtered through a 200-mesh wire mesh to obtain a base emulsion pressure-sensitive adhesive (solid content 59.0). %).

Furthermore, a metal compound (10% aqueous solution of zinc ammonium acetate [Zn (NH ₃ ) ₄ (CH ₃ COO) ₂ ]) as a crosslinking agent was added to the obtained base emulsion pressure-sensitive adhesive with respect to 100 parts of emulsion solids. 0.55 parts, 0.15 parts of sesquioctyl phosphate triethanolamine salt (“ES-N” manufactured by Kitahiro Chemical Co., Ltd.) as a phosphate ester compound, and “Tamanol E-100 as a tackifier resin” "18.9 parts of Arakawa Chemical Co., Ltd., solid content 53%" and 0.1 part of "SN Deformer JK" (San Nopco) as an antifoaming agent are added to prepare an emulsion adhesive composition (C). did.

(Manufacturing method of adhesive tape)
Second laminate layer surface of the substrate at a corona discharge treatment machine, then subjected to corona discharge treatment so that the intensity of 100W / m ^2, so that the thickness after drying of 35 [mu] m, the emulsion adhesive After applying the agent composition (C) and drying at 100 ° C. for 3 minutes, it was wound around a core with an inner diameter of about 76 mm so as to have a length of 20 m, and cut into a width of 25 mm to produce an adhesive tape. did.

Example 1
As the resin for forming the first laminate layer, ethylene, propylene and 1-hexene copolymer are used as the component (A) of the ethylene-α-olefin copolymer copolymerized with a metallocene catalyst instead of the low-density polyethylene. 70% of the blend (Nippon Polyethylene "Kernel KC573", density 0.910) is used as the component (B) of the ethylene-α-olefin copolymer, and ethylene and 1-butene copolymer (Mitsui Chemicals "Toughmer"). A4085 ”, density 0.885) mixed with 30% resin is the same as the above adhesive tape except that the resin is uniformly extruded at 300 ° C. to be 35 g / m ² and laminated. .

Example 2
As the resin for forming the first laminate layer, ethylene, propylene and 1-hexene copolymer are used as the component (A) of the ethylene-α-olefin copolymer copolymerized with a metallocene catalyst instead of the low-density polyethylene. As a component (B) of ethylene-α-olefin copolymer (Beta), ethylene and 1-butene copolymer (“Tafmer, Mitsui Chemicals” “Kernel KC573” manufactured by Nippon Polyethylene Co., Ltd. A4085 ", a resin mixed with 15% density 0.885), at 300 ° C. from a T-die, uniformly extruded so that 35 g / ^{m 2,} except that the laminate is the same as the adhesive tape .

Example 3
As the resin for forming the first laminate layer, ethylene, propylene and 1-hexene copolymer are used as the component (A) of the ethylene-α-olefin copolymer copolymerized with a metallocene catalyst instead of the low-density polyethylene. 70% of the blend (Nippon Polyethylene “Kernel KC573”, density 0.910) is used as the component (B) of the ethylene-α-olefin copolymer, and ethylene and propylene copolymer (“Tafmer P0280” manufactured by Mitsui Chemicals, Inc.) The same as the above adhesive tape except that a resin mixed with 30% of density 0.870) was extruded from a T-die at 300 ° C. so as to be 35 g / m ² and laminated.

Example 4
As the resin for forming the first laminate layer, ethylene, propylene and 1-hexene copolymer are used as the component (A) of the ethylene-α-olefin copolymer copolymerized with a metallocene catalyst instead of the low-density polyethylene. 50% blend (Nippon Polyethylene “Kernel KC573”, density 0.910) is used as component (B) of the ethylene-α-olefin copolymer, and ethylene and propylene copolymer (Mitsui Chemicals “Toughmer P0280”). The resin is the same as the above adhesive tape except that a resin mixed with 50% density 0.870) is uniformly extruded from a T die at 300 ° C. to give 35 g / m ² and laminated.

Comparative Example 1
As the resin for forming the first laminate layer, ethylene, propylene and 1-hexene copolymer are used as the component (A) of the ethylene-α-olefin copolymer copolymerized with a metallocene catalyst instead of the low-density polyethylene. As a component (B) of an ethylene-α-olefin copolymer (30%) made of a blend (Nippon Polyethylene “Kernel KC573”, density 0.910), ethylene and propylene copolymer (Mitsui Chemicals “Toughmer P0280”) The resin is the same as the above adhesive tape except that a resin mixed with 70% of density 0.870) is extruded from a T-die at 300 ° C. so as to be 35 g / m ² and laminated.

Comparative Example 2
As the resin for forming the first laminate layer, ethylene, propylene and 1-hexene copolymer are used as the component (A) of the ethylene-α-olefin copolymer copolymerized with a metallocene catalyst instead of the low-density polyethylene. polymer (manufactured by Japan polyethylene Corporation, "kernel KC573", density 0.910), except that only at 300 ° C. from a T-die to uniformly extruded, laminated so as to be 35 g / ^{m 2,} similarly to the adhesive tape It is.

Comparative Example 3
As the resin for forming the first laminate layer, 50% of the low density polyethylene (density 0.924) is used, and as the component (B) of the ethylene-α-olefin copolymer, ethylene and propylene copolymer (Mitsui Chemicals, Inc.). A resin mixed with 50% of “Toughmer P0280” manufactured by Tuffmer P0280, with a density of 0.870) was extruded from a T-die at 300 ° C. to a uniform density of 35 g / m ² and laminated. It is the same.

Comparative Example 4
After the corona discharge treatment is performed on the surface of the low-density polyethylene resin (density 0.924) layer, which forms the first laminate layer, with a corona discharge treatment machine so that the strength becomes 100 W / m ² , the long chain As an alkyl-based release agent, a release agent solution obtained by dissolving a trade name “Pyroyl 1010” (manufactured by Yushi Co., Ltd.) in toluene which is an organic solvent so as to be 0.05% is 10 g / m ^2. The adhesive tape is the same as that described above except that it is applied with a Meyer bar and dried at 100 ° C. for 1 minute.

Comparative Example 5
After the corona discharge treatment is performed on the surface of the low-density polyethylene resin (density 0.924) layer, which forms the first laminate layer, with a corona discharge treatment machine so as to have a strength of 100 W / m ² , the silicone is peeled off. As the agent, 1 part of the trade name “KS-847T” (manufactured by Shin-Etsu Chemical Co., Ltd.) is diluted with toluene, which is an organic solvent, to a 20-fold dilution, and the product name “CAT-PL50” (manufactured by Shin-Etsu Chemical Co., Ltd.) is used as the platinum catalyst. ) Was added to dissolve the release agent solution at 10 g / m ² with a Meyer bar and dried at 100 ° C. for 1 minute, similar to the above adhesive tape. It is.

  The test results for the tapes of the Examples and Comparative Examples are shown in Table 1 below.

It is sectional drawing of the adhesive tape of this invention (Example 1). It is sectional drawing of the adhesive tape of a conventional product (comparative example 4).

Explanation of symbols

10: entire adhesive tape 11: adhesive layer 12: second laminate layer 13: base fabric 14: first laminate layer (release layer of the present invention)
15: First laminate layer (components are the same as the second laminate layer)
16: Solvent-based release agent layer

Claims (4)

  A release layer is provided on one side of the substrate, and the release layer is a co-polymerization of ethylene and an α-olefin having 3 to 12 carbon atoms with a density of 0.90 or more and less than 0.916. It comprises a polymer (A) and an α-olefin copolymer (B) having a density of 0.87 or more and less than 0.90 and having 3 to 12 carbon atoms. A laminate having a release layer.   The weight ratio of the copolymer (A) by the metallocene-based catalyst of ethylene and an α-olefin having 3 to 12 carbon atoms and the ethylene and α-olefin copolymer (B) having 3 to 12 carbon atoms, It is 90: 10-50: 50, The laminated body which has a mold release layer of Claim 1 characterized by the above-mentioned.   The pressure-sensitive adhesive tape according to claim 1, wherein the pressure-sensitive adhesive tape has a pressure-sensitive adhesive layer on a surface opposite to the release layer of the laminate having the release layer.   The pressure-sensitive adhesive tape according to claim 3, wherein the pressure-sensitive adhesive layer is formed of an acrylic pressure-sensitive adhesive.

Images