JP2014015004A - Release material, method for producing the same and adhesive tape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a release material that can adjust a peel force of a release agent layer without changing a component of the release agent layer.SOLUTION: The method for producing the release material having a polyolefin-based release agent layer formed on at least one face of a substrate, comprises adjusting a peel force of the polyolefin-based release agent layer by irradiating the release agent layer with ultraviolet rays or electron beams. The method further comprises forming the polyolefin-based release agent layer from a release agent containing polyolefin, isocyanate, polyolefin polyol and an urethane formation catalyst.

Description

  The present invention relates to a method for producing a release material. The present invention further relates to a release material produced from the method and a pressure-sensitive adhesive tape having the release material.

  The release material is provided with a release agent layer on at least one surface of a substrate such as paper, plastic film and plastic laminated paper, and is intended to protect the adhesive surface of an adhesive tape, an adhesive sheet, a label, etc. It is used in manufacturing processes for green sheets.

  Known release agents for forming the release agent layer include silicone release agents, long-chain alkyl release agents, polyolefin release agents, and fluorine release agents. However, in applications related to electronic parts and the like, there are cases where silicone-based release agents cause problems, and therefore non-silicone release agents such as polyolefin-based release agents are used. As polyolefin release agents, those containing an isocyanate cross-linking agent and a polyol in addition to polyolefins are known in order to enhance substrate adhesion (for example, Patent Documents 1 to 3).

JP 2004-346213 A JP 2004-206881 A JP 2004-230773 A

  There are various uses for the release material. Depending on the application, the release agent layer of the release material is required to have a low peel strength or, conversely, a high peel strength to some extent. In order to adjust the peeling force by changing the component of the release agent layer in accordance with such various uses, it is necessary to study for that purpose, change the factory equipment, and the like, which is very troublesome.

  The present invention has been made paying attention to the above circumstances, and its object is to provide a method for producing a release material capable of adjusting the peeling force of the release agent layer without changing the components. There is.

  As a result of extensive studies by the present inventors, it has been found that the release force of the release agent layer can be adjusted by irradiating the release material having a polyolefin release agent layer with ultraviolet rays or electron beams. The present invention based on these findings is as follows.

[1] A method for producing a release material having a polyolefin release agent layer on at least one surface of a substrate,
A method comprising adjusting the release force by irradiating a polyolefin release agent layer with ultraviolet rays or an electron beam.
[2] The method according to [1], including forming the polyolefin release agent layer from a release agent containing a polyolefin, an isocyanate, a polyolefin polyol, and a urethanization catalyst.
[3] The method according to [2], wherein the urethanization catalyst is a metal complex catalyst that is a non-organotin compound.
[4] The method according to [3] above, wherein the metal complex catalyst has an organic ligand.
[5] The method according to [4], wherein the metal complex catalyst is a metal chelate catalyst.
[6] Any one of [3] to [5], wherein the metal complex catalyst is at least one selected from the group consisting of a titanium complex catalyst, a zinc complex catalyst, a zirconium complex catalyst, an aluminum complex catalyst, and an iron complex catalyst. The method described in one.
[7] The method according to any one of [2] to [6], wherein the isocyanate is a polyisocyanate having three or more isocyanate groups in one molecule.
[8] The method according to any one of [2] to [7], wherein the number average molecular weight of the polyolefin polyol is 1500 to 50000.
[9] A release material produced by the method according to any one of [1] to [8].
[10] An adhesive tape having an adhesive layer and the release material according to [9],
An adhesive tape in which the adhesive layer and the release agent layer of the release material are in contact.

  According to the method for producing a release material of the present invention, the peeling force of the release agent layer can be adjusted without changing the components.

  The production method of the present invention is a production method of a release material having a polyolefin release agent layer on at least one surface of a substrate, and the release force is adjusted by irradiating the polyolefin release agent layer with ultraviolet rays or an electron beam. It is characterized by that. Hereafter, the manufacturing method of this invention is demonstrated in order.

1. Substrate In the present invention, the substrate is not particularly limited. However, the substrate is preferably a plastic film having a smooth surface. Examples of the plastic film include polyester films such as polyethylene terephthalate film and polybutylene terephthalate film; polyolefin films such as polyethylene film and polypropylene film. Further, paper such as kraft paper, glassine paper, and high-quality paper may be used as the base material. As the paper base material, in order to prevent excessive impregnation of the release agent into the base material, one laminated with a plastic such as polyethylene, or one subjected to sealing treatment is preferable. The base material may be subjected to treatment such as corona treatment, plasma treatment, flame treatment and the like in advance.

  The thickness in particular of a base material is not restrict | limited, It can set suitably according to a use purpose. When using a plastic film as a base material, the thickness is about 12-250 micrometers normally, Preferably it is 16-200 micrometers, More preferably, it is 25-125 micrometers.

  In addition, if necessary, light stabilizers such as antioxidants, ultraviolet absorbers, hindered amine light stabilizers and antistatic agents, carbon black, calcium oxide, magnesium oxide, silica, zinc oxide, titanium oxide fillers, You may mix | blend a pigment etc. with a base material.

2. Polyolefin Release Agent Layer The polyolefin release agent layer may be formed from polyolefin alone or may be formed from a release agent containing polyolefin and other components. In order to form a release agent layer having excellent substrate adhesion, it is preferable to use a release agent containing polyolefin, isocyanate, polyolefin polyol and urethanization catalyst. Hereinafter, these components will be described in order.

[Polyolefin]
In the present invention, the polyolefin may be used alone or in combination of two or more. In the present invention, “polyolefin” means a polyolefin that is solid at 38 ° C. Any polyolefin can be used as long as it can be dissolved in an organic solvent together with other components and applied to a substrate.

From the viewpoint of solubility in an organic solvent, the density of the polyolefin is preferably 0.885 g / cm ³ or less, more preferably 0.880 g / cm ³ or less. When this density exceeds 0.885 g / cm ³ , solubility in an organic solvent tends to be lowered, and application to a substrate tends to be difficult, and peeling force tends to increase. On the other hand, the lower limit of the density of the polyolefin is not particularly limited, but this density is preferably 0.830 g / cm ³ or more, more preferably 0.857 g / cm ³ or more, and further preferably 0.858 g / cm ³ or more. is there.

  Examples of the polyolefin include an α-olefin copolymer formed from at least two monomers selected from the group consisting of ethylene, propylene, and an α-olefin having 4 to 20 carbon atoms. Among these, a copolymer having ethylene as a main monomer (that is, an ethylene-based α-olefin copolymer) and / or a copolymer having propylene as a main monomer (that is, a propylene-based α-olefin). Copolymer) is preferred. Here, as the α-olefin having 4 to 20 carbon atoms, 1-butene, 1-pentene, 3-methyl-1-butene, 1-hexene, 4-methyl-1-pentene, 3-methyl-1- Examples include pentene, 1-heptene, 1-octene, 1-decene, and 1-dodecene. The α-olefin copolymer may be any of a random copolymer, a block copolymer, and a graft copolymer.

The density of the ethylene-based α-olefin copolymer is preferably 0.857 g / cm ³ or more and 0.885 g / cm ³ or less (more preferably 0.880 g / cm ³ or less). The ethylene structural unit amount of the ethylene-based α-olefin copolymer is 50 mol% or more, preferably 60 to 95 mol%, more preferably 70 to 95 mol%. The α-olefin structural unit contained in the ethylene-based α-olefin copolymer is one formed from at least one monomer selected from the group consisting of 1-butene, propylene, 1-hexene and 1-octene. preferable. Particularly preferred ethylene-based α-olefin copolymers include ethylene-1-butene copolymers and ethylene-propylene copolymers. Such an ethylene-1-butene copolymer may contain a structural unit derived from an α-olefin other than ethylene and 1-butene in an amount of 10 mol% or less. Similarly, the ethylene-propylene copolymer may contain a structural unit derived from an α-olefin other than ethylene and propylene in an amount of 10 mol% or less. Such a copolymer is produced, for example, by copolymerizing ethylene and α-olefin using a catalyst comprising a transition metal catalyst component (for example, vanadium compound or zirconium compound) and an organoaluminum compound catalyst component. be able to.

The density of the propylene-based α-olefin copolymer is preferably 0.858 g / cm ³ or more and 0.885 g / cm ³ or less (more preferably 0.880 g / cm ³ or less). The propylene structural unit amount of the propylene-based α-olefin copolymer is more than 50 mol%. This propylene structural unit amount is preferably 60 to 95 mol%, more preferably 70 to 95 mol%. Further, the α-olefin structural unit contained in the propylene-based α-olefin copolymer is formed of at least one monomer selected from the group consisting of ethylene, 1-butene, 1-hexene and 1-octene. Those are preferred. A particularly preferable propylene-based α-olefin copolymer is a propylene-ethylene random copolymer (propylene-based elastomer). In addition, this propylene-ethylene random copolymer may contain the monomer derived from alpha olefins other than propylene and ethylene in the quantity of 10 mol% or less. The propylene-based α-olefin copolymer can be produced using a metallocene-based catalyst, as described in, for example, JP-A-2000-191862.

  A commercially available product can be used as the α-olefin copolymer. Preferable commercial products of the ethylene-based α-olefin copolymer include, for example, Tuffmer P series, Tuffmer A series (all manufactured by Mitsui Chemicals), Engage (manufactured by Dow Chemical Company), and the like. Moreover, as a preferable commercial item of a propylene-type alpha-olefin copolymer, Toughmer XM series (made by Mitsui Chemicals) etc. are mentioned, for example.

Polymethylpentene can also be used as the polyolefin. Examples of polymethylpentene include a homopolymer of 4-methyl-1-pentene, and a copolymer of 4-methyl-1-pentene and other α-olefins. The amount of 4-methyl-1-pentene constituent unit in the polymethylpentene copolymer is preferably 50 to 95 mol%, more preferably 70 to 95 mol%. The polymethylpentene may be a crystalline polymer. The density of polymethylpentene is preferably 0.83 to 0.86 g / cm ³ . Examples of the α-olefin structural unit in the polymethylpentene copolymer include 2 carbon atoms such as ethylene, propylene, 1-butene, 1-hexene, 1-octene, 1-decene, 1-tetradecene and 1-octadecene. Those derived from? -20 olefins are preferred. Among these, 1-decene, 1-tetradecene, and 1-octadecene exhibiting good copolymerizability with 4-methyl-1-pentene are more preferable. An example of a commercially available product of polymethylpentene is TPX-S (4-methylpentene-1-α-olefin copolymer, manufactured by Mitsui Chemicals).

As long as it dissolves in an organic solvent, diolefin rubbers such as polyisoprene and polybutadiene can also be used as the polyolefin. Such polyisoprene has cis-1,4 bonds of 90% or more, a density of 0.90 to 0.92 g / cm ³ , and a Mooney viscosity (ML1 + 4 at 100 ° C.) of 40 to 70. Those are preferred. Examples of commercially available products of polyisoprene include IR-307 and IR-310 (manufactured by Kraton Polymer Co., Ltd.). The polybutadiene is preferably one having a cis-1,4 bond of 90% or more, a density of 0.88 to 0.91 g / cm ³ , and a Mooney viscosity (ML1 + 4 at 100 ° C.) of 25 to 50. Examples of commercially available products of polybutadiene include Nipol BR1220, Nipol BR1220L (manufactured by Nippon Zeon), and BR01 (manufactured by JSR).

  The polyolefin in the present invention preferably does not react with the isocyanate described later. However, a modified polyolefin having a functional group such as a hydroxyl group (hydroxy group), an amino group, a carboxy group, or an isocyanate group (isocyanato group) may be used as long as the object of the present invention is not impaired. The number of functional groups (average value) per molecule of the modified polyolefin is preferably 1 or less.

  When the release agent of the present invention is used in combination with an acrylic pressure-sensitive adhesive, it is particularly preferable to use an ethylene-based α-olefin copolymer and / or a propylene-based α-olefin copolymer as the olefin. It is preferable for preventing an increase in force. On the other hand, when the release agent of the present invention is used for an application requiring a relatively large release force, a propylene-based α-olefin copolymer and / or polymethylpentene is preferable.

  In the present invention, when only one polyolefin is used, the MFR (melt flow rate) at 230 ° C. of the polyolefin is preferably 100 g / 10 min or less from the viewpoint of the strength (coating film strength) of the release agent layer to be formed. More preferably, it is 70 g / 10 minutes or less, More preferably, it is 50 g / 10 minutes or less, Most preferably, it is 10 g / 10 minutes or less.

  In the present invention, when two or more polyolefins are used, the MFR at 230 ° C. of at least one of the polyolefins is preferably 100 g / 10 min or less, more preferably 70 g / 10 min or less, and even more preferably 50 g / 10 Min. Or less, particularly preferably 10 g / 10 min or less. The content of polyolefin having such MFR is preferably 10% by weight, more preferably 50% by weight or more, still more preferably 90% by weight or more, and particularly preferably 100% by weight in the total polyolefin.

  Polyolefin has a tensile modulus at 23 ° C. of 10 MPa or less and a tensile fracture stress at 23 ° C. of 8 MPa or less in order to reduce the release force and release rate dependency of the release agent layer (A-1) Is preferably contained in the total polyolefin in an amount of 90% by weight or more. In other words, the content of the polyolefin (A-2) other than the polyolefin (A-1) is preferably limited to 10% by weight or less in the total polyolefin. Here, the peeling speed dependency means that the peeling force of the release agent layer depends on the peeling speed, and more specifically, means that the peeling force at high speed peeling is larger than the peeling force at low speed peeling. .

  Any of the above-described polyolefin (A-1) and polyolefin (A-2) may be used alone or in combination of two or more. The content of the polyolefin (A-1) is more preferably 95% by weight or more, and still more preferably 100% by weight in the total polyolefin.

  The use of polyolefin (A-1) reduces the release rate dependence because the tensile fracture stress is small under the assumption that fracture occurs near the interface between the pressure-sensitive adhesive layer and the release agent layer in the release process. Since the vicinity of the interface is destroyed with a small force due to the presence of the polyolefin (A-1), it is estimated that the increase in the peeling force can be suppressed even when the peeling speed is increased.

  The tensile elastic modulus at 23 ° C. of the polyolefin (A-1) is 10 MPa or less, preferably 8 MPa or less, more preferably 7 MPa or less, and further preferably 6 MPa or less. The tensile fracture stress of the polyolefin (A-1) at 23 ° C. Is 8 MPa or less, preferably 6 MPa or less, more preferably 4 MPa or less. Polyolefin (A-2) having a tensile modulus of elasticity exceeding 10 MPa at 23 ° C. tends to increase the peeling force of the release agent layer when peeled at a low speed and a high speed, and has a tensile breaking stress exceeding 23 MPa at 23 ° C. (A-2) tends to increase the peeling force of the release agent layer when peeled at a high speed.

  As the polyolefin (A-2), (i) a polyolefin having a tensile fracture stress at 23 ° C. of 8 MPa or less and a tensile modulus at 23 ° C. of more than 10 MPa; (ii) a tensile modulus at 23 ° C. of 10 MPa or less And (iii) a polyolefin having a tensile modulus at 23 ° C. of greater than 10 MPa and a tensile fracture stress at 23 ° C. of greater than 8 MPa. In these, the polyolefin (A-2) of the aspect of said (ii) is preferable. Further, the tensile modulus of elasticity of the polyolefin (A-2) at 23 ° C. is preferably 100 MPa or less, and the tensile fracture stress of the polyolefin (A-2) at 23 ° C. is preferably 35 MPa or less.

  In the present invention, there is no limitation on any of the lower limit value of the tensile elastic modulus at 23 ° C. and the tensile fracture stress at 23 ° C. of the polyolefin (A-1). However, in order to obtain sufficient release agent layer strength (coating film strength), the tensile modulus of elasticity of the polyolefin (A-1) at 23 ° C. is preferably 2 MPa or more, more preferably 3 MPa or more, and the tensile strength at 23 ° C. The fracture stress is preferably 1 MPa or more, more preferably 2 MPa or more.

The “tensile modulus at 23 ° C.” and “tensile fracture stress at 23 ° C.” of the polyolefin are values measured by the following methods.
Polyolefin is dissolved in toluene to make a 5 to 10% by weight solution, and this is applied onto a release film made of polyethylene terephthalate (PET) using a baker type applicator or a doctor blade type applicator, and then heated with a hot air dryer. Heat-dry (100 ° C., 3 minutes), and immediately after the heat-dry, cool in a 23 ° C. atmosphere to produce a polyolefin film having a thickness of 20 μm after drying. If the solubility in toluene is poor, it may be dissolved by heating as necessary. The obtained polyolefin film was cut into strips of 30 mm length x 100 mm width, and while peeling off the polyolefin film from the release film, it was tightly wound in the longitudinal direction around one short side of the cut film as a length. A 30 mm rod-shaped sample is used.

  This rod-shaped sample was subjected to a tensile test with a tensile tester (manufactured by Shimadzu Corp., Autograph AG-IS type) under the conditions of a distance between chucks of 10 mm and a tensile speed of 50 mm / min in an atmosphere of 23 ° C., and the stress at that time -Obtain a strain curve. The tensile elastic modulus is calculated from the slope of the curve immediately after the start of tension in the stress-strain curve. Further, the stress when the rod-shaped sample is broken is determined as the tensile fracture stress.

  Examples of the polyolefin (A-1) having a tensile elastic modulus at 23 ° C. of 10 MPa or less and a tensile fracture stress at 23 ° C. of 8 MPa or less include Toughmer P-0080K, Tuffmer P-0280, Tuffmer A-357070S, Tuffmer P-0680, Tuffmer P-0180, Tuffmer P-0480, Tuffmer P-0275, Tuffmer P-0775 (all of which are ethylene-based α-olefin copolymers, manufactured by Mitsui Chemicals, Inc.).

  The polyolefin content in the release agent is preferably 80 to 99% by weight, more preferably 90 to 98% by weight. When this content is less than 80% by weight, the peeling force tends to increase. On the other hand, when it exceeds 99% by weight, there are too few crosslinking components, so that it is difficult to obtain sufficient release agent layer strength. In addition, the amount of the organic solvent is not included in the “release agent” serving as a reference for the content.

[Isocyanate]
In this invention, only 1 type may be used for isocyanate and it may use 2 or more types together. The isocyanate may be either an aromatic isocyanate or an aliphatic isocyanate. The aliphatic isocyanate may be either a chain aliphatic isocyanate or an alicyclic isocyanate. Among these, aromatic isocyanate and alicyclic isocyanate are preferable. Since aromatic isocyanate and alicyclic isocyanate have low compatibility with polyolefin, even if they are used, the releasability of the release agent layer is not impaired. On the other hand, aromatic isocyanates and alicyclic isocyanates that are incompatible with polyolefin are unevenly distributed between the formed release agent layer and the base material, and greatly contribute to the improvement of their adhesion.

  In order to form a release agent layer having excellent substrate adhesion and heat resistance, the isocyanate is preferably a polyisocyanate having 3 or more isocyanate groups in one molecule, more preferably an aromatic polyisocyanate and a fat. It is at least one selected from the group consisting of cyclic polyisocyanates, and more preferably at least one selected from the group consisting of polyhydric alcohol adducts of aromatic diisocyanates and polyhydric alcohol adducts of alicyclic diisocyanates. .

  Examples of the aromatic diisocyanate include tolylene diisocyanate, diphenylmethane diisocyanate, 1,5-naphthylene diisocyanate, tolidine diisocyanate, xylylene diisocyanate, tetramethylxylylene diisocyanate, and the like. Of these, tolylene diisocyanate and xylylene diisocyanate are preferred.

  Examples of the alicyclic diisocyanate include isophorone diisocyanate, hydrogenated xylylene diisocyanate, hydrogenated diphenylmethane diisocyanate, dimer acid diisocyanate, norbornene diisocyanate, trans-cyclohexane diisocyanate, hydrogenated tolylene diisocyanate, and the like. Of these, isophorone diisocyanate and hydrogenated xylylene diisocyanate are preferred.

  Examples of the polyhydric alcohol include aliphatic polyhydric alcohols such as ethylene glycol, glycerin, trimethylolpropane, pentaerythritol, ditrimethylolpropane, and dipentaerythritol. Of these, trimethylolpropane is preferred.

  Examples of the polyisocyanate include compounds having an isocyanate group at the terminal, obtained by reacting the polyhydric alcohol with an excess amount of the aromatic diisocyanate or the alicyclic diisocyanate. In addition, aromatic diisocyanates or alicyclic diisocyanates (eg, isocyanurates) are also suitable as polyisocyanates. The polyhydric alcohol adduct of aromatic diisocyanate is preferably a polyhydric alcohol adduct of tolylene diisocyanate or xylylene diisocyanate, more preferably a polyhydric alcohol adduct of tolylene diisocyanate. The polyhydric alcohol adduct of tolylene diisocyanate is excellent in reactivity and can achieve excellent substrate adhesion. The polyhydric alcohol adduct of alicyclic diisocyanate is preferably a polyhydric alcohol adduct of hydrogenated xylylene diisocyanate or isophorone diisocyanate.

  The content of isocyanate in the release agent is preferably 0.5 to 20 parts by weight, more preferably 1.0 to 15 parts by weight, and still more preferably 1.5 to 10 parts by weight with respect to 100 parts by weight of polyolefin. Part. If isocyanate is used at such a content, there is no adverse effect such as shortening the pot life of the release agent, and better substrate adhesion can be obtained.

[Polyolefin polyol]
In the present invention, the polyolefin polyol may be used alone or in combination of two or more. Polyolefin polyol is used to react with isocyanate in the formation of a release agent layer. As the polyolefin polyol, those having good compatibility with the polyolefin are preferable.

  The number average molecular weight (Mn) of the polyolefin polyol is preferably 1500 to 50000, more preferably 1500 to 4000, and still more preferably 1500 to 3000. A polyolefin polyol having Mn in such a range has moderate solubility in both polyolefin and isocyanate. Therefore, such a polyolefin polyol can improve the release agent layer strength and heat resistance, while not impairing the appearance of the release agent layer. In addition, when this Mn is outside the above range, a release agent layer having a whitish and cloudy appearance may be obtained. Furthermore, if this Mn is within the above range, the release agent layer where the isocyanate on the side opposite to the substrate is not unevenly distributed does not have excessive hydroxyl groups due to the polyolefin polyol, and a release agent layer having a low release force is present. can get. Furthermore, if this Mn is within the above range, the isocyanate and the polyolefin polyol can be appropriately reacted in the release agent layer portion where the isocyanate on the substrate side is unevenly distributed, and more excellent substrate adhesion can be obtained.

  In the present invention, the type of polyolefin polyol is not particularly limited. Examples of polyolefin polyols include polyethylene polyols, polypropylene polyols, polybutadiene polyols, hydrogenated polybutadiene polyols, polyisoprene polyols, and hydrogenated polyisoprene polyols. Among these, hydrogenated polyisoprene polyol and polyisoprene polyol are preferable from the viewpoint of compatibility with polyolefin and influence on peeling force.

  The hydroxyl value (mgKOH / g) of the polyolefin polyol is preferably 20 or more from the viewpoints of the release agent layer strength and curability, and is preferably 75 or less from the viewpoint of the influence on the peeling force. A more preferred hydroxyl value (mgKOH / g) is 25-60.

  In the present invention, a commercially available polyolefin polyol can be used. Examples of such commercially available products include Poly bdR-45HT (hydroxyl-terminated liquid polybutadiene, Mn = 2800, hydroxyl value = 46.6 mgKOH / g, manufactured by Idemitsu Kosan Co., Ltd.), Poly ip (hydroxyl-terminated liquid polyisoprene, Mn = 2500, hydroxyl value = 46.6 mgKOH / g, manufactured by Idemitsu Kosan Co., Ltd.), Epol (hydroxyl-terminated liquid hydrogenated polyisoprene, Mn = 2500, hydroxyl value = 50.5 mgKOH / g, manufactured by Idemitsu Kosan Co., Ltd.), GI-1000 ( Hydroxyl group-containing liquid hydrogenated polybutadiene, Mn = 1500, hydroxyl value = 60 to 75 mgKOH / g, manufactured by Nippon Soda Co., Ltd., GI-2000 (hydroxyl group-containing liquid hydrogenated polybutadiene, Mn = 2100, hydroxyl value = 40 to 55 mgKOH / g, Nippon Soda Co., Ltd.), GI-3000 (Hydroxyl-containing liquid hydrogenated polybutadiene, M n = 3000, hydroxyl value = 25-35 mg KOH / g, manufactured by Nippon Soda Co., Ltd.). These polyolefin polyols are all liquid at room temperature. Unistor P-801 (16% by weight toluene solution of a hydroxyl group-containing polyolefin, toluene removed product is solid, hydroxyl value 40 mgKOH / g, manufactured by Mitsui Chemicals, Inc.) can also be used.

The content of the polyolefin polyol in the release agent is represented by the following formula (I):
A = hydroxyl value of polyolefin polyol (mgKOH / g) × number of parts by weight of polyolefin polyol with respect to 100 parts by weight of polyolefin (I)
The value of A in is preferably set to be 30 to 250, more preferably 40 to 200, and still more preferably 50 to 150. If the value of A is less than 30, the release agent layer strength tends to be insufficient, and if it is greater than 250, the release force of the release agent layer tends to be too high.

[Urethane catalyst]
In the present invention, the urethanization catalyst for promoting the urethanation reaction between isocyanate and polyol may be used alone or in combination of two or more. As the urethanization catalyst, one or more organic tin compounds may be used. In the present invention, the “organotin compound” refers to a compound or salt having a tin-carbon (Sn—C) bond, and examples thereof include dibutyltin dilaurate and dioctyltin dilaurate. The organotin compound has good solubility in an organic solvent and high catalytic activity, and further has little influence on the peeling force of the release agent layer. Therefore, if an organic tin compound is used, a release agent layer excellent in appearance and substrate adhesion can be formed.

  Since organotin compounds have the advantages as described above, they have been widely used in the past. However, as awareness of environmental issues increases, the use of organotin compounds tends to be limited. From the viewpoint of such environmental problems, it is preferable to use a metal complex catalyst that is a non-organotin compound as the urethanization catalyst.

  In the present invention, “non-organotin compound” refers to a compound or salt having no tin-carbon bond, and “metal complex” has a central metal and a ligand, and these are coordinate bonds. Refers to the compound or salt associated. This metal complex does not include a mere metal salt having no coordination bond, such as a carboxylic acid metal salt. A metal complex having a coordination bond can exhibit excellent solubility in an organic solvent as compared with a metal salt formed only by an ionic bond. Carboxylic acid metal salts have poor solubility in organic solvents, and also poor solubility in release agent components. Therefore, when a carboxylic acid metal salt is used, the appearance of the coated surface may be deteriorated in the drying step of the applied release agent solution.

  A metal complex catalyst may use only 1 type and may use 2 or more types together. Even if a metal complex catalyst that is a non-organotin compound instead of an organic tin compound that has been widely used in the past is used, it is possible to form a release agent layer having excellent adhesion to a substrate and a good appearance.

  From the viewpoint of solubility in an organic solvent, the metal complex catalyst preferably has an organic ligand, and more preferably a metal chelate catalyst. Here, “metal chelate catalyst” refers to a compound or salt in which a metal atom and an organic polydentate ligand form a chelate ring by coordination bond, and “chelate ring” refers to an organic polydentate coordination. A ring structure formed by coordination so that two or more coordinating atoms of a child sandwich a central metal. Examples of the metal chelate catalyst include an acetylacetonato metal complex in which acetylacetone is coordinated to a central metal.

  From the viewpoint of promoting the urethanization reaction, the metal complex catalyst is preferably at least one selected from the group consisting of a titanium complex catalyst, a zinc complex catalyst, a zirconium complex catalyst, an aluminum complex catalyst, and an iron complex catalyst, more preferably, It is at least one selected from the group consisting of a titanium complex catalyst, a zirconium complex catalyst and an iron complex catalyst. These titanium complex catalyst, zinc complex catalyst, zirconium complex catalyst, aluminum complex catalyst and iron complex catalyst are preferably metal chelate catalysts.

  Various metal complex catalysts are commercially available. In the present invention, commercially available metal complex catalysts may be used. Also, various organic ligands, particularly various multidentate ligands that can form metal chelate catalysts are commercially available. Therefore, a metal complex catalyst prepared by combining a commercially available organic ligand and a metal may be used.

  Commercially available metal complex catalysts include, for example, titanium chelate catalysts available from Matsumoto Trading Co., Ltd., such as Olgatics TC-100 (titanium diisopropoxybis (acetylacetonate)), Olgatics TC-401 (titanium tetraacetyl). Acetonate), orgatix TC-200 (titanium dioctyloxybis (octylene glycolate)) and orgatix TC-750 (titanium diisopropoxybis (ethyl acetoacetate)); zirconium chelate catalysts such as orgatix ZC- 150 (zirconium tetraacetylacetonate, powder), ORGATIZ ZC-700 (zirconium tetraacetylacetonate, solution), ORGATIZ ZC-540 (zirconium tributoxy mono) Cetyl acetonate), orgatix ZC-570 (zirconium monobutoxyacetylacetonate bis (ethyl acetoacetate)) and orgatix ZC-580 (zirconium dibutoxy bis (ethyl acetoacetate)); and aluminum chelate complexes such as orgatix AL-80 (aluminum trisacetylacetonate) and the like can be mentioned, and among these, ORGATICS TC-401, ORGATICS ZC-150 and ORGATICS ZC-700 are preferable, and ORGATICS TC-401 is more preferable.

  Examples of commercially available metal complex catalysts include zirconium chelate catalysts manufactured by KING INDUSTRIES, such as K-KAT 4205 (zirconium acetylacetonate complex) and K-KAT A209 (zirconium (6-methyl-2,4-heptadionate). ) Complexes); zinc amine catalysts such as K-KAT XK-614 and K-KAT XK-622; and aluminum chelate catalysts such as K-KAT 5218 (aluminum bis (ethylacetoacetate) monoacetylacetonate). Among these, K-KAT 4205, K-KAT A209, K-KAT XK-614 and K-KAT 5218 are preferable, and K-KAT 4205, K-KAT A209 and K-KAT 5218 are more preferable. K-KAT A209 is more preferable.

Moreover, as a commercially available metal complex catalyst, Sunny Cat TC-100 (also referred to as diisopropoxy titanium bis (ethyl acetoacetate), titanium diisopropoxy bis (ethyl acetoacetate)) manufactured by Nitto Kasei Co., Ltd .; Titanium tetraacetylacetone (also called titanium tetraacetylacetate), titanium tetraheptanedione (also called titanium tetrakis (tetramethylheptanedionate)), zirconium tetraacetylacetone (also called zirconium tetraacetylacetate), zirconium tetramethylheptanedione, iron acetylacetone (Also called iron (III) trisacetylacetonate) and iron tetramethylheptanedione (iron (III) tris (tetramethylheptanedionate) U); ALCH (aluminum (ethyl acetoacetate) diisopropylate), ALCH-TR ((aluminum tris (ethylacetoacetate)), aluminum chelate M (aluminum (alkyl acetoacetate) diisopropylate) manufactured by Kawaken Fine Chemical Co., Ltd. Aluminum chelate D (aluminum bis (ethylacetoacetate) mono (acetylacetonate)) and aluminum chelate A (W) (aluminum tris (acetylacetonate)); Tris (ethylacetoacetate) manufactured by Wako Pure Chemical Industries, Ltd. Aluminum (also referred to as aluminum tris (acetylacetonate)), tetrakis (2,2,6,6-tetramethyl-3,5-heptanedionato) zirconium (IV), iron (III) acetylacetonate and tris 2,2,6,6-tetramethyl-3,5-heptanedionato) iron (III); and nachem aluminum (aluminum tris (acetylacetonate)), nasem zirconium (zirconium tetrakis (acetyl) manufactured by Nippon Chemical Industry Co., Ltd. Acetonate)), nursem titanium (titanium dibutoxybis (acetylacetonate)) and nursem ferric iron (iron (III) trisacetylacetonate).

  The content of the urethanization catalyst in the release agent is preferably 0.1 to 2.5 parts by weight, more preferably 0.2 to 2.0 parts by weight, and still more preferably 0.2 parts by weight with respect to 100 parts by weight of the polyolefin. 3 to 1.5 parts by weight. When the content is less than 0.1 parts by weight, the catalytic action may be insufficient. On the other hand, when the content exceeds 2.5 parts by weight, the release force of the release agent layer is increased or the release is peeled off. It may cause problems such as shortening the pot life of the agent.

[Other ingredients]
The release agent used in the present invention may contain components other than the above-mentioned polyolefin, isocyanate, polyolefin polyol and urethanization catalyst (hereinafter abbreviated as “other components”). Other components may use only 1 type and may use 2 or more types together. Other components include, for example, liquid hydrocarbons, resins other than the above polyolefins, antioxidants, ultraviolet absorbers, light stabilizers (eg, hindered amine light stabilizers), antistatic agents, fillers, or pigments (eg, carbon Black, calcium oxide, magnesium oxide, silica, zinc oxide, titanium oxide, etc.).

  For example, when a release agent layer having a low peel strength is required, one or more liquid hydrocarbons may be used as the other component. Here, the “liquid hydrocarbon” in the present invention is a carbonization having a viscosity at 38 ° C. (hereinafter sometimes referred to as “38 ° C. viscosity”) of 5 to 1500 Pa · s measured according to JIS K7117-1: 1990. Means hydrogen. By using such a liquid hydrocarbon, the speed dependency of the release force of the release agent layer can be reduced without reducing the adhesive force of the adhesive tapes.

  The 38 ° C. viscosity of the liquid hydrocarbon is usually 5 to 1500 Pa · s, preferably 5 to 1300 Pa · s. When this 38 degreeC viscosity is less than 5 Pa * s, the speed dependence of peeling force may not fully reduce. In order to sufficiently reduce the speed dependency of the peeling force, when the amount of liquid hydrocarbon having a viscosity at 38 ° C. of less than 5 Pa · s is increased, the adhesive strength of the adhesive tapes is lowered. On the other hand, when the viscosity at 38 ° C. exceeds 1500 Pa · s, the fluidity of the liquid hydrocarbon is lowered around 10 to 30 ° C., which is the assumed use temperature of the release material and the adhesive tape, and thus the speed dependency of the peeling force is It may not be reduced sufficiently.

  Examples of liquid hydrocarbons include polymers of unsaturated hydrocarbons. Here, the “polymer of unsaturated hydrocarbon” in the present invention is used to mean not only a polymer but also an oligomer. From the viewpoint of compatibility, the liquid hydrocarbon is preferably a liquid copolymer of ethylene and an unsaturated hydrocarbon having 3 to 5 carbon atoms, a liquid homopolymer of an unsaturated hydrocarbon having 3 to 5 carbon atoms, and the number of carbon atoms. It is at least one selected from the group consisting of 3 to 5 unsaturated hydrocarbon liquid copolymers. Examples of the unsaturated hydrocarbon having 3 to 5 carbon atoms include propylene, 1-butene, isobutene, 2-butene, butadiene, 1-pentene, 2-pentene, isopentene, and isoprene. The liquid hydrocarbon is more preferably at least one selected from the group consisting of a liquid ethylene-olefin copolymer, liquid polybutadiene, liquid polyisoprene, liquid hydrogenated polybutadiene, liquid hydrogenated polyisoprene, and liquid polyisobutene. The liquid hydrocarbon can be produced by a known method such as radical polymerization or cationic polymerization.

  A commercial product may be used as the liquid hydrocarbon. Examples of commercially available liquid hydrocarbons include Lucant HC-600 (38 ° C. viscosity = 8.5 Pa · s), HC-2000 (38 ° C. viscosity = 34 Pa · s) (manufactured by Mitsui Chemicals, Inc.), Claprene LIR- 30 (38 ° C. viscosity = 74 Pa · s), LIR-50 (38 ° C. viscosity = 480 Pa · s), LIR-290 (38 ° C. viscosity = 1000 Pa · s), LBR-300 (38 ° C. viscosity = 280 Pa · s) ( As mentioned above, Kuraray Co., Ltd.), Nisseki Polybutene HV-100, HV-300, HV-1900 (above, made by Nippon Oil Corporation), Nissan Polybutene 10N, 30N, 200N (above, made by NOF Corporation) and the like. .

  When liquid hydrocarbon is used, its content in the release agent is preferably 3 to 30 parts by weight, more preferably 4 to 20 parts by weight, even more preferably, based on 100 parts by weight of the total of polyolefin and liquid hydrocarbons. Is 5 to 15 parts by weight. When this content is less than 3 parts by weight, the release rate dependency may not be sufficiently reduced. Conversely, when it exceeds 30 parts by weight, the strength of the release agent layer may be reduced or the adhesive layer of the adhesive tape. Liquid hydrocarbons may migrate to the adhesive tape, which may reduce the adhesive strength of the adhesive tape.

3. Formation of Polyolefin Release Agent Layer The polyolefin release agent layer is made of polyolefin or release agent (in the following description of “3. Formation of polyolefin release agent layer”, these are collectively referred to as “release agent”). It can be formed by a known means. For example, a release agent layer can be formed by dissolving a release agent in an organic solvent to prepare a release agent solution, applying the obtained release agent solution to a substrate, and drying the solution.

  As an organic solvent, only 1 type may be used and 2 or more types may be used together. The content of the organic solvent is preferably adjusted in the range of 95 to 99.9% by weight in the release agent solution. The organic solvent is not particularly limited as long as it can dissolve the release agent uniformly. However, since the release agent of the present invention contains polyolefin as an essential component, the organic solvent is preferably only one hydrocarbon solvent, a mixed solvent of two or more hydrocarbon solvents, or a hydrocarbon solvent. And other solvents. When the mixed solvent is used, the content of the hydrocarbon solvent is preferably 50% by weight or more, more preferably 70% by weight or more, and more preferably 90% by weight or more in the mixed solvent. Examples of the hydrocarbon solvent include aliphatic hydrocarbons such as normal hexane and normal heptane, alicyclic hydrocarbons such as cyclohexane, and aromatic hydrocarbons such as toluene and xylene. Examples of other solvents include ketones such as methyl ethyl ketone, cyclohexanone, and acetylacetone, esters such as ethyl acetate, alcohols such as methanol, ethanol, isopropyl alcohol, and tert-butyl alcohol. From the viewpoint of improving the pot life of the release agent solution, a mixed solvent of a hydrocarbon solvent and acetylacetone and a mixed solvent of a hydrocarbon solvent and tert-butyl alcohol are preferable.

  The method for applying the release agent solution is not particularly limited, and any known method, for example, a method using a kiss roll coater, a bead coater, a rod coater, a Meyer bar coater, a die coater, a gravure coater or the like can be used. There is no particular limitation on the drying method, and any known method can be used. A common drying method is hot air drying. Although the temperature of hot air drying may change also with the heat resistance of a base material, it is about 80-150 degreeC normally.

  The thickness of the release agent layer after drying is preferably 30 to 500 nm, more preferably 45 to 400 nm, and still more preferably 60 to 300 nm. When this thickness is less than 30 nm, the release force of the release agent layer may be too high. Conversely, when it exceeds 500 nm, the substrate and the release agent layer that come into contact with each other when the release material is wound into a roll shape, May cause a problem that it becomes easy to block, and a problem that the peeling force of the release agent layer becomes high.

  In the release material, another layer may exist between the release agent layer and the substrate as long as the release agent layer is present on the outermost surface. However, the release agent layer is preferably formed directly on the substrate.

4). Irradiation of Ultraviolet or Electron Beam The production method of the present invention is characterized by irradiating a polyolefin release agent layer with ultraviolet or electron beam to adjust (that is, increase) its peeling force.

  In order to irradiate ultraviolet rays, a known ultraviolet lamp can be used. As the ultraviolet lamp, either an electrodeless ultraviolet lamp or an electroded ultraviolet lamp can be used. Since a high peak illuminance is obtained, it is preferable to use an electrodeless ultraviolet lamp. Examples of the electrodeless ultraviolet lamp include D bulb, H bulb, H plus bulb, and V bulb manufactured by Fusion. Among these, H valve and H plus valve manufactured by Fusion are preferred. Examples of the electroded ultraviolet lamp include a high-pressure mercury lamp and a metal halide lamp. The output of the electrodeless ultraviolet lamp and the electroded ultraviolet lamp is preferably 160 W / cm or more, more preferably 200 W / cm or more, and further preferably 240 W / cm or more.

The peak illuminance of the irradiated ultraviolet light is preferably 0.3 to 4.0 W / cm ² , more preferably 0.5 to 4.0 W / cm ² , and still more preferably 1.0 to 4.0 W / cm ² . . When the peak illuminance is less than 0.3 W / cm ² , the peeling force may not be sufficiently increased by ultraviolet irradiation. On the other hand, if the peak illuminance is too high, the substrate may be damaged. However, even if the peak illuminance exceeds 4.0 W / cm ² , the base material may not be damaged depending on the type of the selected base material. In such a case, 4.0 W / cm ² is set. Ultraviolet irradiation may be performed with a peak illuminance exceeding. Moreover, the integrated irradiation amount of ultraviolet rays is preferably 0.1 to 5.0 J / cm ² , more preferably 0.1 to 2.0 J / cm ² . When the cumulative irradiation amount of ultraviolet rays is less than 0.1 J / cm ² , the peeling force of the release agent layer may hardly increase. On the other hand, in order to make the cumulative irradiation amount of ultraviolet rays exceed 5.0 J / cm ² , it is necessary to increase the number of ultraviolet lamps and reduce the production speed, which is not preferable for production.

  When irradiating an electron beam, an electron beam irradiation apparatus such as a curtain method or a scanning method can be used. The acceleration voltage of the electron beam is preferably 10 to 1000 KV, more preferably 50 to 300 KV. If the acceleration voltage is less than 10 KV, the electron beam transmittance may be insufficient. On the other hand, an acceleration voltage exceeding 1000 KV is economically undesirable. The irradiation amount of the electron beam is preferably 0.1 to 100 kGyy. When the electron beam irradiation dose is less than 0.1 kGy, the peeling force of the release agent layer may hardly increase. On the other hand, when the electron beam irradiation dose exceeds 100 kGy, the substrate may be deteriorated.

  The electron beam irradiation is preferably performed in an atmosphere with a reduced oxygen concentration in order to suppress generation of ozone. The oxygen concentration in the atmosphere for electron beam irradiation is preferably 600 ppm or less, more preferably 400 ppm or less. Examples of means for reducing the oxygen concentration include substitution with an inert gas (for example, nitrogen, helium, carbon dioxide, etc.).

5. TECHNICAL FIELD The present invention also provides a release material produced by the above method, and an adhesive tape having the release material and the pressure-sensitive adhesive layer, wherein the pressure-sensitive adhesive layer and the release agent layer of the release material are in contact with each other. To do.

  There is no limitation in particular in the adhesive used in order to form an adhesive layer. Examples of the pressure-sensitive adhesive include a rubber-based pressure-sensitive adhesive, an acrylic pressure-sensitive adhesive, and a polyester-based pressure-sensitive adhesive. Among these, acrylic adhesives and polyester adhesives are preferred. The pressure-sensitive adhesive tape with a release material having a pressure-sensitive adhesive layer formed using an acrylic pressure-sensitive adhesive and a polyester-based pressure-sensitive adhesive exhibits stable releasability.

  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, a UV polymerization method, and, as necessary, a crosslinking agent, a tackifier, a softener, It can be prepared by adding various additives such as anti-aging agents and fillers.

  As an acrylic polymer, for example, alkyl (meth) acrylate such as butyl (meth) acrylate and 2-ethylhexyl (meth) acrylate is used as a main component. -Hydroxy group-containing monomers such as hydroxyethyl (meth) acrylate, carboxy group-containing monomers such as (meth) acrylic acid, styrene monomers such as styrene, vinyl esters such as vinyl acetate, etc. Examples thereof include a copolymer of a monomer mixture to which a monomer is added.

  As the polyester-based pressure-sensitive adhesive, a polyester-based polymer having an aliphatic polyol diol (for example, a carbonate diol obtained by reaction of a diol component such as butanediol and a carbonate compound such as ethylene carbonate) as an essential polyol component is used. Examples include a pressure-sensitive adhesive as a main ingredient.

  The pressure-sensitive adhesive layer can be formed, for example, by applying a pressure-sensitive adhesive solution to the release agent layer of the release material and drying it. Alternatively, a pressure-sensitive adhesive layer may be formed by applying a pressure-sensitive adhesive solution on a base material different from the base material of the release material and drying it, and then bonding this to the release agent layer of the release material. Furthermore, you may form the adhesive layer of a mold release material by bonding a commercially available adhesive tape to the release agent layer of a mold release material. The thickness of the pressure-sensitive adhesive layer can be appropriately selected in consideration of adhesiveness and the like, and is preferably 3 to 100 μm, more preferably 5 to 90 μm, and still more preferably 10 to 80 μm.

6). Physical properties, properties, etc. The physical properties, properties, etc. in this specification are measured values by the following methods.
(1) Density This is a value measured according to ASTM D1505.
(2) MFR (230 ° C)
It is a value measured according to ASTM D1238.
(3) Number average molecular weight It is the value measured based on ASTM D2503.
(4) Hydroxyl value A value measured in accordance with JIS K1557: 1970.

  EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples and comparative examples, but these do not limit the present invention. In the following, “part” and “%” represent “part by weight” and “% by weight”, respectively, unless otherwise specified.

1. Release agent component The release agent components used in Examples and Reference Examples are described below.
(1) Polyolefin Tuffmer P-0280 (ethylene-propylene copolymer (ethylene: 87 mol%, propylene: 13 mol%), manufactured by Mitsui Chemicals, MFR (230 ° C.): 5.4 g / 10 min, density: 0.00 (87 g / cm ³ , tensile elastic modulus at 23 ° C .: 5.1 MPa, tensile fracture stress at 23 ° C .: 3.3 MPa)
TAFMER A-3570S (ethylene-1-butene copolymer (ethylene: 85 mol%, 1-butene: 15 mol%), manufactured by Mitsui Chemicals, MFR (230 ° C.): 65 g / 10 min, density: 0.87 g / cm ³ , tensile elastic modulus at 23 ° C .: 3.5 MPa, tensile fracture stress at 23 ° C .: 2.1 MPa)

(2) Polyolefin polyol Epol (hydroxyl-terminated liquid hydrogenated polyisoprene, Mn: 2500, hydroxyl value: 50.5 mgKOH / g, manufactured by Idemitsu Kosan Co., Ltd.)

(3) Isocyanate Coronate L (75% ethyl acetate solution of trimethylolpropane adduct of tolylene diisocyanate, number of isocyanate groups in one molecule: 3, manufactured by Nippon Polyurethane)

(4) Metal complex catalyst nasem ferric (iron (III) trisacetylacetonate, manufactured by Nippon Chemical Industry Co., Ltd.)
(5) Organic solvent Toluene tert-Butyl alcohol

2. Preparation of stripper solution Tuffmer P-0280: 80 parts Tuffmer A-3570S: 20 parts Epaul: 1 part Coronate L: 2 parts Nacem ferric iron: 0.1 part The above components are added to toluene / tert-butyl alcohol. = 95/5 (weight ratio) was dissolved in a mixed solvent to prepare a release agent solution having a solid content of 1.5%.

3. Formation of Release Agent Layer The prepared release agent was applied to a polyester film having a thickness of 38 μm using Meyer bar # 6, and then heated with a hot air dryer at 130 ° C. for 1 minute to obtain a release material. The thickness of the release agent layer of the obtained release material was about 150 nm.

4). Ultraviolet irradiation The release agent layer of the obtained release material was irradiated with ultraviolet rays under the following conditions.
Electrodeless ultraviolet lamp: “F-600 H bulb” manufactured by Fusion (output: 240 W / cm)
Conveyor speed: 20m / min
Number of times of irradiation: 3 times (accumulated dose of ultraviolet rays: 0.6 J / cm ² , Example 1) 10 times (accumulated dose of ultraviolet rays: 2.0 J / cm ² , Example 2)

5. Electron beam irradiation The release agent layer of the obtained release material was irradiated with an electron beam under the following conditions.
Electron beam irradiation machine: “CB250 / 15 / 180L” (curtain type) manufactured by I Electron Beam
Acceleration voltage: 100 kV
Oxygen concentration: 200 ppm (replaced with nitrogen)
Electron beam irradiation amount: 10 kGy (Example 3), 20 kGy (Example 4), 30 kGy (Example 5)

6). Measurement of release force of release agent layer Release material of Examples 1 and 2 produced by irradiating the release agent layer with ultraviolet rays, Release material of Examples 3 to 4 produced by irradiating the release agent layer with electron beams, and ultraviolet irradiation The release force of the release agent layer was measured as follows using the release material of the reference example produced without performing any of the above and electron beam irradiation. Specifically, acrylic adhesive tape No. 50 mm wide. 31B (manufactured by Nitto Denko Corporation) was bonded to the surface of the release agent layer using a hand roller and stored at 70 ° C. for 24 hours. The peel strength was measured in an atmosphere at 23 ° C. The results are shown in Tables 1 and 2.

  As shown in Table 1 and Table 2, the peeling force of the release agent layer can be increased by irradiation with ultraviolet rays or electron beams. Moreover, the increase amount of peeling force can also be adjusted by controlling irradiation amount. Therefore, according to the production method of the present invention, a release material having release agent layers having various levels of release force can be obtained without changing the components of the release agent layer.

Claims (10)

A method for producing a release material having a polyolefin release agent layer on at least one side of a substrate,
A method comprising adjusting the release force by irradiating a polyolefin release agent layer with ultraviolet rays or an electron beam.   The method according to claim 1, comprising forming the polyolefin release agent layer from a release agent containing polyolefin, isocyanate, polyolefin polyol and urethanization catalyst.   The method according to claim 2, wherein the urethanization catalyst is a metal complex catalyst which is a non-organotin compound.   The method according to claim 3, wherein the metal complex catalyst has an organic ligand.   The method according to claim 4, wherein the metal complex catalyst is a metal chelate catalyst.   The method according to any one of claims 3 to 5, wherein the metal complex catalyst is at least one selected from the group consisting of a titanium complex catalyst, a zinc complex catalyst, a zirconium complex catalyst, an aluminum complex catalyst, and an iron complex catalyst.   The method according to any one of claims 2 to 6, wherein the isocyanate is a polyisocyanate having 3 or more isocyanate groups in one molecule.   The number average molecular weight of polyolefin polyol is 1500-50000, The method as described in any one of Claims 2-7.   The mold release material manufactured by the method as described in any one of Claims 1-8. An adhesive tape having an adhesive layer and a release material according to claim 9,
An adhesive tape in which the adhesive layer and the release agent layer of the release material are in contact.