WO2012105340A1

WO2012105340A1 - Release agent, release material, and adhesive tape

Info

Publication number: WO2012105340A1
Application number: PCT/JP2012/051215
Authority: WO
Inventors: 平松　剛; 悠司豊田
Original assignee: 日東電工株式会社
Priority date: 2011-02-04
Filing date: 2012-01-20
Publication date: 2012-08-09
Also published as: JP2012162625A

Abstract

The present invention provides a release agent containing a polyolefin, an isocyanate, a polyolefin polyol, a carboxylic acid metal salt, and an organic solvent. The carboxylic acid metal salt is a non-organic tin compound and the organic solvent is a mixture of a hydrocarbon solvent and a non-proton polar solvent.

Description

Release agent, release material and adhesive tape

The present invention relates to a release agent containing polyolefin (hereinafter sometimes abbreviated as “polyolefin release agent”), and a release material and an adhesive tape having a release agent layer formed from the release agent.

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.

As the release agent, a silicone release agent, a long-chain alkyl release agent, a polyolefin release agent, a fluorine release agent, and the like are known. However, in applications related to electronic parts and the like, there are cases in which silicone-based release agents cause problems, and therefore non-silicone release agents such as polyolefin-based release agents are used.

In order to improve the adhesion of the polyolefin release agent to the substrate, an isocyanate crosslinking agent and a polyol may be used in the polyolefin release agent (for example, Patent Documents 1 to 3). Furthermore, a urethanization catalyst may be added to accelerate the urethanization reaction between the isocyanate-based crosslinking agent and the polyol. As the urethanization catalyst, organic tin compounds such as dibutyltin dilaurate and dioctyltin dilaurate have been widely used. The organotin compound has high catalytic activity in addition to having good solubility in an organic solvent, so that it can be used to form a release agent layer excellent in appearance and substrate adhesion. .

JP 2004-346213 A Japanese Patent Laid-Open No. 2004-250681 JP 2004-230773 A

However, in recent years, the use of organotin compounds tends to be restricted as the awareness of environmental issues increases. Therefore, there is a demand for a release agent that does not contain an organic tin compound. The present invention has been made by paying attention to such circumstances, and the object thereof is to form a release agent layer having excellent adhesion to a substrate and having a good appearance without using an organic tin compound. It is to provide a release agent that can be used.

As a result of intensive studies by the present inventors, a carboxylic acid metal salt that is a non-organotin compound is used as a urethanization catalyst, and a mixed solvent of a hydrocarbon solvent and an aprotic polar solvent is used as an organic solvent. Thus, the inventors have found that the above object can be achieved and completed the present invention. The present invention is as follows.

[1] A release agent containing polyolefin, isocyanate, polyolefin polyol, metal carboxylate and an organic solvent,
The carboxylic acid metal salt is a non-organotin compound,
A release agent in which the organic solvent is a mixed solvent of a hydrocarbon solvent and an aprotic polar solvent.
[2] The stripping agent according to [1], wherein the hydrocarbon solvent is an aromatic hydrocarbon solvent.
[3] The stripping agent according to [2], wherein the aromatic hydrocarbon solvent is at least one selected from the group consisting of toluene and xylene.
[4] The release agent according to any one of [1] to [3], wherein the aprotic polar solvent is a ketone solvent.
[5] The release agent according to [4], wherein the ketone solvent is at least one selected from the group consisting of methyl ethyl ketone, acetylacetone, and cyclohexanone.
[6] The stripping agent according to the above [1], wherein the hydrocarbon solvent is xylene or toluene and xylene, and the aprotic polar solvent is at least one selected from the group consisting of acetylacetone and cyclohexanone.
[7] The stripping agent according to any one of the above [1] to [6], wherein the weight ratio of the hydrocarbon solvent to the aprotic polar solvent is 99: 1 to 90:10.
[8] The stripping agent according to any one of [1] to [7], wherein the metal carboxylate is bismuth carboxylate.
[9] The release agent according to any one of [1] to [8], wherein the isocyanate is a polyisocyanate having 3 or more isocyanate groups in one molecule.
[10] The release agent according to [9], wherein the polyisocyanate is at least one selected from the group consisting of aromatic polyisocyanates and alicyclic polyisocyanates.
[11] The release agent according to [10], wherein the polyisocyanate is at least one selected from the group consisting of a polyhydric alcohol adduct of an aromatic diisocyanate and a polyhydric alcohol adduct of an alicyclic diisocyanate.
[12] The release agent according to any one of [1] to [11], wherein the polyolefin polyol has a number average molecular weight of 1500 to 50000.
[13] A release material having a base material and a release agent layer,
A release material having a release agent layer formed from the release agent according to any one of [1] to [12] above on at least one surface of a substrate.
[14] A pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer and the release material according to [13] above,
An adhesive tape in which the adhesive layer and the release agent layer of the release material are in contact.
[15] An adhesive tape having a substrate, an adhesive layer and a release agent layer,
A release agent layer formed from the release agent according to any one of the above [1] to [12] is provided on one side of the substrate,
A pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer on the other surface of a substrate on which a release agent layer is not formed.

Although the release agent of the present invention does not contain an organic tin compound, it can form a release agent layer having excellent adhesion to a substrate and having a good appearance.

1. Release Agent The release agent of the present invention contains polyolefin, isocyanate, polyolefin polyol, metal carboxylate and organic solvent. Hereinafter, each of these components will be described in order.

[Polyolefin]
The release agent of the present invention contains one type or two or more types of polyolefin. 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, 1-dodecene and the like. 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. The ethylene structural unit amount is 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 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%. The propylene structural unit amount is preferably 60 to 95 mol%, more preferably 70 to 95 mol%. 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 preferred propylene-based α-olefin copolymer is a propylene-ethylene random copolymer (propylene-based elastomer). The propylene-ethylene random copolymer may contain a constituent unit derived from α-olefin other than propylene and ethylene in an amount 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.

Commercially available products 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. In addition, as a preferable commercial product of the propylene-based α-olefin copolymer, for example, Tuffmer XM series (manufactured by Mitsui Chemicals) and the like can be mentioned.

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, 1-octadecene and the like. Those derived from .alpha.-olefins of .about.20 are preferred. Of these, 1-decene, 1-tetradecene and 1-octadecene, which exhibit good copolymerizability with 4-methyl-1-pentene, are more preferred. 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 a cis-1,4 bond 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.). As the polybutadiene, those 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 are preferable. 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.

In particular, when the release agent of the present invention is used in combination with an acrylic pressure-sensitive adhesive, the use of an ethylene-based α-olefin copolymer and / or a propylene-based α-olefin copolymer as an olefin may cause the release over time. 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.

In order to reduce the dependency of the release agent layer on the peeling force and the peeling rate, the 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 (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 dependency because the tensile fracture stress is small under the assumption that fracture occurs near the interface between the adhesive layer and the release agent layer in the release process. The presence of the polyolefin (A-1) destroys the vicinity of the interface with a small force, and it is estimated that the increase in the peeling force can be suppressed even when the peeling speed is increased.

The tensile 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 even more 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 fracture stress at 23 ° C. exceeding 8 MPa. (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 elastic modulus at 23 ° C. of more than 10 MPa; (ii) a tensile elastic 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. Among these, the polyolefin (A-2) of the embodiment (ii) is preferable. The tensile modulus at 23 ° C. of the polyolefin (A-2) is preferably 100 MPa or less, and the tensile fracture stress at 23 ° C. of the polyolefin (A-2) is preferably 35 MPa or less.

In the present invention, there is no limitation on the lower limit of the tensile modulus at 23 ° C. and the tensile fracture stress at 23 ° C. of 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. 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. 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 in length and 100 mm in 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) in a 23 ° C atmosphere under conditions of a distance between chucks of 10 mm and a tensile speed of 50 mm / min. Obtain the stress-strain curve. The tensile modulus is calculated from the slope of the stress-strain curve immediately after the start of tension. 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-335070S, Tuffmer P-0680, Tuffmer P-0180, Tuffmer P-0480, Tuffmer P-0275, Tuffmer P-0775 (all are ethylene-based α-olefin copolymers, manufactured by Mitsui Chemicals, Inc.) and the like.

The content of the polyolefin is preferably 80 to 99% by weight, more preferably 90 to 98% by weight in the solid content of the release agent. 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. The solid content of the release agent means the total content of release agent components other than the organic solvent.

[Isocyanate]
The release agent of the present invention contains one or more isocyanates. 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 isocyanate and alicyclic isocyanate that are incompatible with polyolefin are unevenly distributed between the release agent layer to be formed and the base material, and greatly contribute to the improvement of adhesion.

In order to form a release agent layer excellent in substrate adhesion and heat resistance, the isocyanate is preferably a polyisocyanate having three 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, 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, 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]
The release agent of the present invention contains one or more polyolefin polyols. 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.

In addition, the hydroxyl value (mgKOH / g) of the polyolefin polyol is preferably 20 or more from the viewpoint 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 mg KOH / g, manufactured by Idemitsu Kosan Co., Ltd.), Epol (hydroxyl-terminated liquid hydrogenated polyisoprene: Mn = 2500, hydroxyl value = 50.5 mg KOH / 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: n = 3000, hydroxyl value = 25 ~ 35mgKOH / g, manufactured by Nippon Soda Co., Ltd.) and the like. These polyolefin polyols are all liquid at room temperature. Unistor P-801 (16% by weight toluene solution of hydroxyl group-containing polyolefin, toluene removed product is solid, hydroxyl value 40 mg KOH / 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 is preferably set to 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.

[Carboxylic acid metal salt]
The release agent of the present invention contains a carboxylic acid metal salt that is a non-organotin compound as a urethanization catalyst. 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. In contrast, “non-organotin compound” refers to a compound or salt having no tin-carbon bond.

The carboxylic acid of the carboxylic acid metal salt may be either an aliphatic carboxylic acid or an aromatic carboxylic acid. The carboxylic acid may be either a monobasic acid or a polybasic acid. The aliphatic carboxylic acid may be linear or branched, and may be either saturated or unsaturated. The aliphatic carboxylic acid may have an alicyclic alkyl group.

Examples of the aliphatic carboxylic acid include pentanoic acid, hexanoic acid, heptanoic acid, octanoic acid, 2-ethylhexanoic acid, nonanoic acid, decanoic acid, neodecanoic acid, oleic acid and linoleic acid. Examples of the aromatic carboxylic acid include benzoic acid, phthalic acid, isophthalic acid, and terephthalic acid.

The carboxylic acid may be naphthenic acid or resin acid. In the present invention, naphthenic acid means carboxylic acid contained in petroleum, and resin acid means carboxylic acid contained in natural resin. Naphthenic acid and resin acid may be either one kind or a mixture of two or more kinds. Examples of naphthenic acid include those having a carboxy group at the end of the methylene side chain of the cyclopentane ring or cyclohexane ring. Examples of the resin acid include abietic acid, neoabietic acid, dehydroabietic acid, pultrinic acid, levopimaric acid, podocarpic acid, d-pimalic acid, and iso-d-pimalic acid.

Examples of the metal of the carboxylic acid metal salt include bismuth, zirconium, zinc, titanium, and calcium. From the viewpoint of catalytic activity and solubility in an organic solvent, the carboxylic acid metal salt is preferably bismuth carboxylate.

As the carboxylic acid metal salt, only one kind may be used, or a mixture of two or more kinds may be used. A mixture of carboxylic acid metal salts includes a mixture formed from a plurality of carboxylic acids and one metal base, a mixture formed from one carboxylic acid and a plurality of metal bases, and a plurality of carboxylic acids and a plurality of metal bases. Any of the mixtures formed from

In the present invention, a commercially available carboxylic acid metal salt may be used. Examples of commercially available bismuth carboxylates include Puccat B7 and Puccat B25 (both manufactured by Nippon Kagaku Sangyo Co., Ltd.), Neostan U-600 (manufactured by Nitto Kasei Co., Ltd.), and K-KAT XC-227 (manufactured by KING INDUSTRIES). Is mentioned. Examples of commercially available zirconium carboxylates include naphthex Zr and Nikka Octix Zr (both manufactured by Nippon Chemical Industry Co., Ltd.). Examples of commercially available zinc carboxylates include naphthex Zn and Nikka octix Zn (both manufactured by Nippon Chemical Industry Co., Ltd.). Examples of commercially available calcium carboxylates include naphthex Ca, Nikka octix Ca and PACCAT Ca-5B (all manufactured by Nippon Kagaku Sangyo Co., Ltd.).

The content of the carboxylic acid metal salt in the release agent is preferably 0.1 to 2.5 parts by weight, more preferably 0.3 to 2.0 parts by weight, and still more preferably 0 to 100 parts by weight of the polyolefin. .4 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.

In addition, content of carboxylic acid metal salt here refers to the quantity of only carboxylic acid metal salt, for example, the solution which dissolved carboxylic acid metal salt in the solvent like "Pucat B7" used in the below-mentioned Example. When used, it means the amount of carboxylic acid metal salt only, excluding the amount of solvent.

[Organic solvent]
The release agent of the present invention contains a mixed solvent of a hydrocarbon solvent and an aprotic polar solvent as an organic solvent. As the hydrocarbon solvent and the aprotic polar solvent, only one type may be used, or two or more types may be used in combination.

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. From the viewpoint of the solubility of the release agent component (particularly isocyanate), aromatic hydrocarbons are preferred, toluene and xylene are more preferred, and toluene is more preferred.

Examples of the aprotic polar solvent include ketone solvents such as acetone, methyl ethyl ketone, cyclohexanone and acetylacetone; ether solvents such as diethyl ether; ester solvents such as ethyl acetate; nitrile solvents such as acetonitrile; N, N— Examples thereof include amide solvents such as dimethylformamide (DMF) and N, N-dimethylacetamide (DMAC); and sulfoxide solvents such as dimethyl sulfoxide (DMSO). From the viewpoint of the solubility of the release agent component (particularly metal carboxylate), ketone solvents are preferred, methyl ethyl ketone, cyclohexanone and acetylacetone are more preferred, and acetylacetone is more preferred.

When using an aromatic hydrocarbon solvent having a high boiling point as a hydrocarbon solvent, particularly xylene (boiling point 144 ° C.) or a mixed solvent thereof, if the boiling point of the aprotic polar solvent is too low, When the release agent layer is formed, only the aprotic polar solvent is removed first, which may adversely affect the appearance of the resulting release agent layer. Therefore, when using an aromatic hydrocarbon solvent having a high boiling point, it is preferable to use an aprotic polar solvent having a high boiling point as well. For example, when the hydrocarbon solvent is xylene or toluene and xylene (preferably toluene and xylene), the aprotic polar solvent is preferably cyclohexanone (boiling point 156 ° C.), acetylacetone (boiling point 140 ° C.) , N, N-dimethylformamide (boiling point 153 ° C.) and N, N-dimethylacetamide (boiling point 165 ° C.), more preferably at least one selected from the group consisting of acetylacetone and cyclohexanone. More preferred is acetylacetone.

From the balance of solubility of the release agent component, especially the balance of solubility of isocyanate and carboxylic acid metal salt, the weight ratio of hydrocarbon solvent to aprotic polar solvent (hydrocarbon solvent: aprotic polar solvent) is The ratio is preferably 99: 1 to 90:10, more preferably 99: 1 to 92: 8, and still more preferably 99: 1 to 95: 5. Further, the content of the organic solvent is adjusted in the release agent, preferably in the range of 95 to 99.9% by weight.

[Optional ingredients]
The release agent of the present invention may contain one or more optional components. For example, when a release agent layer having a low release force is required, one or more liquid hydrocarbons may be used as an optional component of the release agent. 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 decreases near the expected use temperature of the release material and the adhesive tape of 10-30 ° C. 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 a carbon number. 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, isoprene and the like. 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.

Commercial products may be used as liquid hydrocarbons. 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) (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, manufactured by Nippon Oil Corporation), Nissan Polybutene 10N, 30N, 200N (above, made by NOF Corporation), etc. .

When liquid hydrocarbon is used, the content of the release agent in the release agent is preferably 3 to 30 parts by weight, more preferably 4 to 20 parts by weight, even more preferably 100 parts by weight in total of the polyolefin and the liquid hydrocarbon. 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.

The release agent of the present invention may be a resin other than the polyolefin, an antioxidant, an ultraviolet absorber, a light stabilizer such as a hindered amine light stabilizer or an antistatic agent, carbon black, calcium oxide, magnesium oxide, if necessary. It may contain a filler such as silica, zinc oxide and titanium oxide, a pigment and the like.

2. Release material The present invention also provides a release material having a substrate and a release agent layer. The release material of the present invention is characterized by having a release agent layer formed from the release agent of the present invention on at least one surface of a substrate. Hereinafter, the substrate and the release agent layer will be described in order.

[Base material]
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 a treatment such as a corona treatment, a plasma treatment, or a flame treatment in advance as necessary.

The thickness of the base material is not particularly limited and can be appropriately set according to the purpose of use. When a plastic film is used as the substrate, the thickness is usually about 12 to 250 μm, preferably 16 to 200 μm, more preferably 25 to 125 μm.

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.

[Release layer]
The release agent layer is obtained, for example, by applying the release agent of the present invention containing an organic solvent to a substrate and drying it.

The application method of the release agent 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. The temperature of hot air drying may vary depending on the heat resistance of the substrate, but is usually about 80 to 150 ° C.

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.

3. The present invention also provides a pressure-sensitive adhesive tape having the pressure-sensitive adhesive layer and the mold release material of the present invention, wherein the pressure-sensitive adhesive layer and the release agent layer of the mold release material are in contact with each other.

There is no particular limitation on the pressure-sensitive adhesive used for forming the pressure-sensitive 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 the 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.

4). TECHNICAL FIELD The present invention also provides an adhesive tape having a base material, an adhesive layer and a release agent layer. This pressure-sensitive adhesive tape of the present invention has a release agent layer formed from the release agent of the present invention on one side of the substrate, and has an adhesive layer on the other side of the substrate where the release agent layer is not formed. It is characterized by. Hereinafter, the release agent layer of this aspect may be referred to as a “back treatment layer”, and the adhesive tape of this aspect may be referred to as “back treatment layer-attached adhesive tape”.

The backside treatment layer-attached adhesive tape may be either rolled up or laminated. In any form, the pressure-sensitive adhesive layer is protected by the back treatment layer.

In the pressure-sensitive adhesive tape with a back treatment layer, the pressure-sensitive adhesive layer and the back treatment layer may both be formed directly on the substrate, and another layer is formed between these layers and the substrate. It may be. However, both the pressure-sensitive adhesive layer and the back treatment layer must be present on the outermost surface. By doing this, when the pressure-sensitive adhesive tape is wound in a roll shape or when the pressure-sensitive adhesive tape in the form of a sheet is laminated, the back treatment layer can be in contact with the pressure-sensitive adhesive layer to protect it. it can. In addition, it is preferable that both the pressure-sensitive adhesive layer and the back treatment layer are directly formed on the substrate.

The pressure-sensitive adhesive used for forming the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape with the back treatment layer is not particularly limited. As an adhesive for this, what was demonstrated with the adhesive tape with a mold release material etc. are mentioned, for example. Moreover, the formation method of an adhesive layer can also employ | adopt the method similar to what was demonstrated with the adhesive tape with a mold release material.

As the method for forming the back treatment layer, the same method as described for the pressure-sensitive adhesive tape with a release material can be employed. The thickness of the back treatment layer is preferably 30 to 500 nm, more preferably 45 to 400 nm, and still more preferably 60 to 300 nm, from the viewpoint of peeling force.

5. 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) Melt flow rate (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.

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 Comparative 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) Liquid hydrocarbon Lucant HC-2000 (ethylene-α-olefin co-oligomer, 38 ° C. viscosity: 34 Pa · s, manufactured by Mitsui Chemicals)

(5) Urethane catalyst Neostan U-600 (2-ethylhexanoic acid solution of bismuth tris (2-ethylhexanoate), carboxylic acid metal salt content: 55-58%, manufactured by Nitto Kasei Co., Ltd.)
Pucat B7 (Mineral spirit solution of bismuth resinate, metal bismuth content: 7%, mineral spirit content: 42%, manufactured by Nippon Chemical Industry Co., Ltd.)
Dibutyltin dilaurate (IV) (manufactured by Wako Pure Chemical Industries, Ltd., dibutyltin dilaurate)

(6) Organic solvent Hydrocarbon solvent: toluene, xylene, normal hexane Aprotic polar solvent: methyl ethyl ketone, acetylacetone, cyclohexanone

2. Preparation of Release Agent A release agent having a solid content of 1.5% was prepared by dissolving polyolefin, polyolefin polyol, isocyanate, liquid hydrocarbon and urethanization catalyst in an organic solvent in the number of parts shown in Tables 1 and 2. In addition, the number of parts of the urethanization catalyst shown in Tables 1 and 2 is the number of parts of the obtained urethanization catalyst itself, and when the obtained urethanization catalyst is a solution, it is the number of parts of the whole solution. The weight ratio of each organic solvent used is also shown in Tables 1 and 2.

3. Formation of release agent layer (preparation of release material)
The prepared release agent was applied to a 38 μm thick polyester film using a Mayer 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). Characteristic evaluation The characteristics of the catalyst used (that is, whether it is a non-organotin compound), the dissolution state of the release agent, and the characteristics of the resulting release agent layer (that is, appearance, substrate adhesion and normal release force) In Tables 3 and 4. The method for evaluating the dissolved state of the release agent and the properties of the release agent layer are described below.

(1) Dissolving state of release agent The dissolution state of the obtained release agent was visually determined according to the following criteria.
○: The release agent is transparent, and the release agent component is uniformly dissolved in the organic solvent.
X: There are insolubles in the release agent, and the release agent component is not uniformly dissolved in the organic solvent.

(2) Appearance of release agent layer The appearance of the formed release agent layer was visually determined according to the following criteria.
○: There is no unevenness or repellency, and the release agent layer is uniform.
X: There are stripes, dots, irregular shapes, repelling, and the release agent layer is uneven.

(3) Base material adhesion of release agent layer The state when the release agent layer surface was rubbed 3 times with a finger was determined according to the following criteria.
◯: There is no change or the surface becomes whitish and cloudy, but the release agent layer does not fall off.
X: The release agent layer falls off and scraps are generated when the eraser is rubbed, and the substrate is exposed.

(4) Normal peel strength of release agent layer Acrylic adhesive tape No. 25 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 23 ° C. for 24 hours, and then the mold release material was 3.0 m / min in the 180 ° direction with a tensile tester. The normal peel strength was measured in an atmosphere at 23 ° C.

As shown in Tables 3 and 4, in Examples 1 to 6 using a carboxylic acid metal salt which is a non-organotin compound, as in Comparative Example 5 using an organotin compound as a urethanization catalyst, excellent peeling properties were obtained. An agent layer was obtained. In contrast, in Comparative Examples 1 to 4 using a carboxylic acid metal salt but using only a hydrocarbon solvent (toluene, xylene or normal hexane), only a release agent layer having a poor appearance was formed. Furthermore, in the release agent of Comparative Example 4 using only normal hexane, isocyanate precipitated.

The release agent of the present invention can form a release agent layer having excellent characteristics without using an organic tin compound having a problem with the environment. The release material and the adhesive tape having the release agent layer can be suitably used for various applications such as those related to electronic components.

Claims

A release agent containing polyolefin, isocyanate, polyolefin polyol, carboxylic acid metal salt and organic solvent,
The carboxylic acid metal salt is a non-organotin compound,
A release agent in which the organic solvent is a mixed solvent of a hydrocarbon solvent and an aprotic polar solvent.
The release agent according to claim 1, wherein the hydrocarbon solvent is an aromatic hydrocarbon solvent.
The release agent according to claim 2, wherein the aromatic hydrocarbon solvent is at least one selected from the group consisting of toluene and xylene.
The release agent according to any one of claims 1 to 3, wherein the aprotic polar solvent is a ketone solvent.
The release agent according to claim 4, wherein the ketone solvent is at least one selected from the group consisting of methyl ethyl ketone, acetylacetone, and cyclohexanone.
The stripping agent according to claim 1, wherein the hydrocarbon solvent is xylene, or toluene and xylene, and the aprotic polar solvent is at least one selected from the group consisting of acetylacetone and cyclohexanone.
The release agent according to any one of claims 1 to 6, wherein the weight ratio of the hydrocarbon solvent to the aprotic polar solvent is 99: 1 to 90:10.
The stripping agent according to any one of claims 1 to 7, wherein the metal carboxylate is bismuth carboxylate.
The release agent according to any one of claims 1 to 8, wherein the isocyanate is a polyisocyanate having 3 or more isocyanate groups in one molecule.
The release agent according to claim 9, wherein the polyisocyanate is at least one selected from the group consisting of an aromatic polyisocyanate and an alicyclic polyisocyanate.
The release agent according to claim 10, wherein the polyisocyanate is at least one selected from the group consisting of a polyhydric alcohol adduct of an aromatic diisocyanate and a polyhydric alcohol adduct of an alicyclic diisocyanate.
The release agent according to any one of claims 1 to 11, wherein the number average molecular weight of the polyolefin polyol is 1500 to 50000.
A release material having a base material and a release agent layer,
A release material having a release agent layer formed from the release agent according to any one of claims 1 to 12 on at least one surface of a substrate.
It is an adhesive tape having an adhesive layer and a release material according to claim 13,
An adhesive tape in which the adhesive layer and the release agent layer of the release material are in contact.
A pressure-sensitive adhesive tape having a base material, a pressure-sensitive adhesive layer and a release agent layer;
Having a release agent layer formed from the release agent according to any one of claims 1 to 12 on one side of a substrate;
A pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer on the other surface of a substrate on which a release agent layer is not formed.