JP2012161963A - Mold release material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold release material which has a release agent layer with small release velocity dependence and can effectively suppress blocking when a base material comes into contact with the release agent layer.SOLUTION: The mold release material has, on one surface of the base material, the release agent layer formed of a release agent containing nonreactive polyolefin (A), isocyanate (B) and polyolefin polyol (C) and content of the nonreactive polyolefin (A) is 80 mass% or more in the release agent. The nonreactive polyolefin (A) contains nonreactive polyolefin (A-1) which has modulus of tensile elasticity of ≤10 MPa at 23°C and tensile fracture stress of ≤8 MPa at 23°C and content of the nonreactive polyolefin (A-1) is 90 mass% or more in the nonreactive polyolefin (A). Further surface roughness Ra of another surface in the base material where no release agent layer is formed is 0.1 μm or more.

Description

  The present invention relates to a release material having a substrate and a release agent layer.

  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 in which 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

  Some release materials having a release agent layer with excellent substrate adhesion exhibit low peel force at low speed peel but high peel force at high speed peel (that is, high release rate dependence) There is. A mold release material having a large release rate dependency is not easy to use. Therefore, there is a demand for a release material having a small release rate dependency.

  In addition, when a release material having an olefin-based release agent layer formed on one side of a base material is wound up in a roll shape or a sheet-like release material is laminated, the contacted base material and the release agent layer are blocked. Sometimes. Particularly, a combination of a polyethylene terephthalate (PET) base material and an olefin-based release agent layer tends to cause blocking. There is a need for a mold release material in which such blocking is suppressed.

  The present invention has been made paying attention to the above circumstances, and its purpose is to have a release agent layer having a small release rate dependency and to block when the substrate and the release agent layer are in contact with each other. It is in providing the mold release material which can suppress effectively.

  As a result of extensive studies by the present inventors, a release agent layer formed from a release agent containing a specific amount or more of non-reactive polyolefin having a tensile modulus at 23 ° C. and a tensile fracture stress of not more than a specific value, It has been found that the film has a small peeling rate dependency. Further, it has been found that blocking the release agent layer and the substrate can be effectively suppressed by setting the surface roughness Ra of the other surface of the substrate on which the release agent layer is not formed to a specific value or more. It was. The present invention based on these findings is as follows.

[1] A release material having a substrate and a release agent layer,
The release agent layer is formed on one side of a substrate from a release agent containing non-reactive polyolefin (A), isocyanate (B) and polyolefin polyol (C) that is solid at 38 ° C.,
The content of the non-reactive polyolefin (A) is 80% by mass or more in the release agent,
The non-reactive polyolefin (A) contains a non-reactive polyolefin (A-1) having a tensile modulus at 23 ° C. of 10 MPa or less and a tensile fracture stress at 23 ° C. of 8 MPa or less,
Content of non-reactive polyolefin (A-1) is 90 mass% or more in non-reactive polyolefin (A),
A release material in which the surface roughness Ra of the other surface of the substrate on which the release agent layer is not formed is 0.1 μm or more.
[2] The mold release material according to the above [1], wherein the isocyanate (B) is a polyisocyanate having 3 or more isocyanate groups in one molecule.
[3] The mold release material according to [2], wherein the polyisocyanate is at least one selected from the group consisting of an aromatic polyisocyanate and an alicyclic polyisocyanate.
[4] The mold release material according to [3], 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.
[5] Any of the above [1] to [4], wherein the content of isocyanate (B) in the release agent is 0.5 to 20 parts by mass with respect to 100 parts by mass of the non-reactive polyolefin (A). The release material as described in one.
[6] The mold release material according to any one of [1] to [5], wherein the number average molecular weight of the polyolefin polyol (C) is 1500 to 50000.
[7] The release agent according to [1], wherein the release agent further contains a liquid hydrocarbon (D) having a viscosity at 38 ° C. of 5 to 1500 Pa · s.
[8] The content of the liquid hydrocarbon (D) in the release agent is 3 to 30 parts by mass with respect to 100 parts by mass in total of the non-reactive polyolefin (A) and the liquid hydrocarbon (D) [ 7].

  The release agent layer of the release material of the present invention exhibits a small release rate dependency. Moreover, in the mold release material of this invention, blocking when a base material and a releasing agent layer contact is suppressed effectively.

  The release material of the present invention has a release agent layer and a substrate. Hereinafter, the release agent layer and the substrate will be described in order.

1. Release agent layer In this invention, a release agent layer is formed from the release agent containing non-reactive polyolefin (A), isocyanate (B), and polyolefin polyol (C) which are solid at 38 degreeC. Hereinafter, the release agent component will be described in order.

[Non-reactive polyolefin (A)]
In the present invention, “non-reactive polyolefin” refers to a polyolefin that does not react with isocyanate (B) and polyolefin polyol (C) described later, that is, a functional group that reacts with isocyanate (B) and polyolefin polyol (C), such as a hydroxyl group ( It means a polyolefin containing no hydroxy group), amino group, carboxy group, isocyanate group (isocyanato group) or the like. This non-reactive polyolefin (A) is a solid at 38 ° C.

  The content of the non-reactive polyolefin (A) is 80% by mass or more, preferably 85% by mass or more, more preferably 90% by mass or more in the release agent (that is, in the release agent layer). When content of non-reactive polyolefin (A) is less than 80 mass%, there exists a tendency for peeling force to become large. In addition, there is no limitation in particular in the upper limit of content of non-reactive polyolefin (A). However, in order to ensure a sufficient amount of isocyanate (B) and polyolefin polyol (C) to obtain a sufficient release agent layer strength, the content of the non-reactive polyolefin (A) is preferably 99 in the release agent. It is at most mass%, more preferably at most 98 mass%. In addition, the amount of the organic solvent is not included in the “release agent” serving as a reference for the content.

  The non-reactive polyolefin (A) is a non-reactive polyolefin (A-1) having 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 an amount of 90% by mass or more. That is, the non-reactive polyolefin (A) may contain a non-reactive polyolefin (A-2) other than the non-reactive polyolefin (A-1) as long as the amount is 10% by mass or less. When the content of the non-reactive polyolefin (A-1) in the non-reactive polyolefin (A) is less than 90% by mass, peeling is performed at a low speed and / or a high speed due to the influence of the non-reactive polyolefin (A-2). The release force of the release agent layer is increased. The content of the non-reactive polyolefin (A-1) is preferably 95% by mass or more, more preferably 100% by mass in the non-reactive polyolefin (A).

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

  As the non-reactive polyolefin (A-2), (i) a non-reactive polyolefin having a tensile fracture stress at 23 ° C. of 8 MPa or less and a tensile elastic modulus at 23 ° C. exceeding 10 MPa; (ii) tensile elasticity at 23 ° C. A non-reactive polyolefin having a modulus of 10 MPa or less and a tensile fracture stress at 23 ° C. of greater than 8 MPa; and (iii) a non-reactive property at a tensile modulus of elasticity of greater than 10 MPa at 23 ° C. Polyolefins; In these, the non-reactive polyolefin (A-2) of the aspect of said (ii) is preferable. Moreover, the tensile elastic modulus at 23 ° C. of the non-reactive polyolefin (A-2) is preferably 100 MPa or less, and the tensile fracture stress at 23 ° C. of the non-reactive polyolefin (A-2) is preferably 35 MPa or less. is there.

  In the present invention, there is no limitation on either the tensile modulus of elasticity of the non-reactive polyolefin (A-1) at 23 ° C. or the lower limit value of the tensile fracture stress at 23 ° C. However, in order to obtain a sufficient release agent layer strength (coating film strength), the non-reactive polyolefin (A-1) has a tensile elastic modulus at 23 ° C. of preferably 2 MPa or more, more preferably 3 MPa or more. The tensile fracture stress at ° C. 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 non-reactive polyolefin (A) are values measured by the following methods.
Non-reactive polyolefin (A) was dissolved in toluene to form a 5 to 10% by mass solution, and this was applied onto a release film made of polyethylene terephthalate (PET) using a baker type applicator or a doctor blade type applicator. Then, heat-dry with a hot air dryer (100 ° C., 3 minutes), and immediately after heating and drying in an atmosphere of 23 ° C., a non-reactive polyolefin (A) film having a thickness of 20 μm after drying is produced. To do. If the solubility in toluene is poor, it may be dissolved by heating as necessary. The obtained non-reactive polyolefin (A) film was cut into a strip of 30 mm length x 100 mm width, and the non-reactive polyolefin (A) film was peeled off from the release film, with one short side of the cut film as the axis. Then, the sample is wound tightly in the longitudinal direction to obtain a rod-shaped sample having a length of 30 mm.
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. A stress-strain curve is obtained. 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.

  The non-reactive polyolefin (A) {that is, the non-reactive polyolefin (A-1) and the non-reactive polyolefin (A-2)} can be dissolved in an organic solvent together with other components and applied to a substrate, for example. Preferred are low density non-reactive polyolefins (A) with good solubility in organic solvents. In general, a release agent layer formed from a release agent containing a low-density polyolefin has a small release force but a large release rate dependency. However, in the present invention, non-reactive polyolefin (A-1) having a tensile modulus at 23 ° C. of 10 MPa or less and a tensile fracture stress at 23 ° C. of 8 MPa or less is contained in an amount of 90% by mass or more. Since the reactive polyolefin (A) is used, the peeling rate dependency can be reduced. This effect is based on the assumption that non-reactive polyolefin (A-1) having a small tensile fracture stress exists mainly under the assumption that fracture occurs near the interface between the pressure-sensitive adhesive layer and the release agent layer in the peeling process. It is estimated that this is because the increase in the peeling force can be suppressed even if the peeling speed is increased.

The density of the non-reactive polyolefin (A) 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 , the solubility in an organic solvent is lowered, and it may be difficult to apply the release agent solution to the substrate, and the release force of the release agent layer also increases. There is. The density of the non-reactive polyolefin (A) is preferably 0.855 g / cm ³ or more. When the density of the non-reactive polyolefin (A), particularly the ethylene-based α-olefin copolymer is low, the melting point is lowered and the heat resistance is deteriorated.

  Examples of the non-reactive polyolefin (A) 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. It is done. Among these, a copolymer having ethylene as a main monomer (that is, an ethylene-based α-olefin copolymer) is preferable. 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 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.

  A commercially available product can be used as the non-reactive polyolefin (A). For example, examples of commercially available ethylene-based α-olefin copolymers include Tafmer P series, Tafmer A series (all manufactured by Mitsui Chemicals), and Engage (produced by Dow Chemical Co.). Examples of commercially available ethylene-based α-olefin copolymers that satisfy the requirements for non-reactive polyolefin (A-1) include, for example, Tuffmer P-0080K, Tuffmer P-0280, Tuffmer A-35070S, Tuffmer P-0680, Examples include Tuffmer P-0180, Tuffmer P-0480, Tuffmer P-0275, Tuffmer P-0775 (all manufactured by Mitsui Chemicals).

  Only 1 type may be used for non-reactive polyolefin (A-1), and 2 or more types may be used together. Further, when the non-reactive polyolefin (A) contains the non-reactive polyolefin (A-2), the non-reactive polyolefin (A-2) may be used alone or in combination of two or more. May be. For example, two types of non-reactive polyolefin (A-1) may be used, and one type of non-reactive polyolefin (A-1) and one type of non-reactive polyolefin (A-2) are used. May be.

  In the present invention, when only one type of non-reactive polyolefin (A-1) is used as the non-reactive polyolefin (A), the MFR (melt flow rate) of the non-reactive polyolefin (A-1) at 230 ° C. Is preferably 100 g / 10 min or less, more preferably 70 g / 10 min or less, further preferably 50 g / 10 min or less, and particularly preferably 10 g / 10 min or less from the viewpoint of the release agent layer strength and the like.

  When at least one non-reactive polyolefin (A-1) and at least one non-reactive polyolefin (A-2) are used as the non-reactive polyolefin (A), the non-reactive polyolefin (A- As at least one kind of 1), it is preferable to use one having an MFR at 230 ° C. of 100 g / 10 min or less. The MFR of the non-reactive polyolefin (A-1) at 230 ° C. is more preferably 70 g / 10 min or less, further preferably 50 g / 10 min or less, and particularly preferably 10 g / 10 min or less. The content of the non-reactive polyolefin (A-1) having such MFR is preferably 10% by mass or more, more preferably 50% by mass or more in the non-reactive polyolefin (A).

[Isocyanate (B)]
The release agent for forming the release agent layer contains one or more isocyanates (B). Isocyanate (B) 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 the non-reactive polyolefin (A), even if they are used, the peelability of the release agent layer is not impaired. On the other hand, the aromatic isocyanate and alicyclic isocyanate which are incompatible with the non-reactive polyolefin (A) are unevenly distributed between the formed release agent layer and the substrate, and greatly contribute to the improvement of the adhesion.

  In order to form a release agent layer excellent in substrate adhesion and heat resistance, the isocyanate (B) is preferably a polyisocyanate having 3 or more isocyanate groups in one molecule, more preferably an aromatic poly. It is at least one selected from the group consisting of isocyanate and alicyclic polyisocyanate, 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. One.

  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 the isocyanate (B) in the release agent is preferably 0.5 to 20 parts by mass, more preferably 1.0 to 15 parts by mass with respect to 100 parts by mass of the non-reactive polyolefin (A). More preferably, it is 1.5-10 mass parts. If isocyanate (B) is used with such content, there will be no bad influences, such as shortening the pot life of release agent, and more excellent substrate adhesion will be obtained.

[Polyolefin polyol (C)]
The release agent for forming the release agent layer contains one or more polyolefin polyols (C). The polyolefin polyol (C) is used for reacting with the isocyanate (B) in the formation of the release agent layer. As the polyolefin polyol (C), those having good compatibility with the non-reactive polyolefin (A) are preferable.

  The number average molecular weight (Mn) of the polyolefin polyol (C) is preferably 1500 to 50000, more preferably 1500 to 4000, and still more preferably 1500 to 3000. The polyolefin polyol (C) having Mn in such a range has moderate solubility in both the non-reactive polyolefin (A) and the isocyanate (B). Therefore, such a polyolefin polyol (C) can improve the release agent layer strength and heat resistance, while maintaining 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 hydroxyl group resulting from the polyolefin polyol (C) is not excessive in the release agent layer portion where the isocyanate (B) on the side opposite to the substrate is not unevenly distributed, and the release force Is obtained. Furthermore, if this Mn is within the above range, the isocyanate (B) and the polyolefin polyol (C) can react appropriately in the release agent layer portion where the isocyanate (B) on the substrate side is unevenly distributed, and it is more excellent. The substrate adhesion can be obtained.

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

  The hydroxyl value (mgKOH / g) of the polyolefin polyol (C) 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, commercially available polyolefin polyol (C) 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: M n = 3000, hydroxyl value = 25-35 mg KOH / g, manufactured by Nippon Soda Co., Ltd.). These polyolefin polyols (C) are all liquid at room temperature. Moreover, Unistor P-801 (16 mass% toluene solution of hydroxyl-containing polyolefin, toluene removal thing is solid, hydroxyl value 40 mgKOH / g, the Mitsui Chemicals company make) can also be used.

The content of the polyolefin polyol (C) in the release agent is represented by the following formula (I):
A = hydroxyl value of polyolefin polyol (C) (mgKOH / g) × number of parts by mass of polyolefin polyol (C) with respect to 100 parts by mass of non-reactive polyolefin (A) (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.

[Optional ingredients]
The release agent for forming the release agent layer may contain one or more optional components. Optional components include, for example, resins other than non-reactive polyolefin (A), antioxidants, ultraviolet absorbers, light stabilizers such as hindered amine light stabilizers and antistatic agents, carbon black, calcium oxide, magnesium oxide, silica And fillers such as zinc oxide and titanium oxide, and pigments.

[Liquid hydrocarbon (D)]
When a release agent layer having a low release force is required, one or more liquid hydrocarbons (D) may be used as an optional component of the release agent. Here, “liquid hydrocarbon (D)” in the present invention means a viscosity at 38 ° C. (hereinafter sometimes abbreviated as “38 ° C. viscosity”) measured according to JIS K7117-1: 1990 is 5 to 1500 Pa · s. Means a hydrocarbon. By using such a liquid hydrocarbon (D), the speed dependency of the peeling force of the release agent layer can be reduced without reducing the adhesive strength of the pressure-sensitive adhesive tapes.

  The 38 ° C. viscosity of the liquid hydrocarbon (D) 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. If the amount of the liquid hydrocarbon (D) having a 38 ° C. viscosity of less than 5 Pa · s is increased in order to sufficiently reduce the speed dependency of the peeling force, 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 (D) decreases at around 10-30 ° C., which is the assumed use temperature of the release material and the pressure-sensitive adhesive tape. The dependency may not be reduced sufficiently.

  Examples of the liquid hydrocarbon (D) 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 (D) is preferably a liquid copolymer of ethylene and an unsaturated hydrocarbon having 3 to 5 carbon atoms, or a liquid homopolymer of an unsaturated hydrocarbon having 3 to 5 carbon atoms. And at least one selected from the group consisting of liquid copolymers of unsaturated hydrocarbons having 3 to 5 carbon atoms. 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 (D) 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 (D) can be produced by a known method such as radical polymerization or cationic polymerization.

  A commercially available product may be used as the liquid hydrocarbon (D). Examples of commercially available liquid hydrocarbons (D) include Lucant HC-600 (38 ° C. viscosity = 8.5 Pa · s), HC-2000 (38 ° C. viscosity = 34 Pa · s) (above, manufactured by Mitsui Chemicals), 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) s) (above, manufactured by Kuraray Co., Ltd.), Nisseki Polybutene HV-100, HV-300, HV-1900 (above, manufactured by Nippon Oil Corporation), Nissan Polybutene 10N, 30N, 200N (above, manufactured by NOF Corporation), etc. Is mentioned.

  When liquid hydrocarbon (D) is used, its content in the release agent is preferably 3 to 30 parts by mass with respect to a total of 100 parts by mass of non-reactive polyolefin (A) and liquid hydrocarbon (D). More preferably, it is 4-20 mass parts, More preferably, it is 5-15 mass parts. When this content is less than 3 parts by mass, the peeling rate dependency may not be sufficiently reduced. Conversely, when it exceeds 30 parts by mass, the strength of the release agent layer is reduced or the adhesive layer of the adhesive tape is reduced. Liquid hydrocarbons may migrate and reduce the adhesive strength of the adhesive tape.

  In addition, when liquid hydrocarbon (D) is used, compared with the case where this is not used, the mold release material obtained becomes easy to block. However, the release material of the present invention effectively suppresses blocking by adjusting the surface roughness Ra of the other surface of the base material on which the release agent layer is not formed as described later to a specific value or more. . Therefore, even if the release material of the present invention has a release agent layer formed from a release agent containing liquid hydrocarbon (D), blocking can be effectively suppressed.

[Urethane catalyst]
In order to accelerate the reaction between the isocyanate (B) and the polyolefin polyol (C), one or more urethanization catalysts may be used as an optional component of the release agent. As the urethanization catalyst, a catalyst used in a normal urethanization reaction can be used, for example, a tin compound such as dibutyltin dilaurate or dioctyltin dilaurate; a metal carboxylate such as zinc, cobalt, copper or bismuth; Examples include amine compounds such as 4-diazabicyclo [2.2.2] octane; chelate compounds of metals such as titanium and zirconium. Moreover, organic acid bismuth salt can also be used as a urethanization catalyst. Examples of the organic acid bismuth salt include abietic acid, neoabietic acid, d-pimalic acid, iso-d-pimalic acid and podocarpic acid, and alicyclic organic acids such as resin acids mainly composed of two or more of these. And bismuth salts of aromatic organic acids such as benzoic acid, cinnamic acid, and p-oxycinnamic acid. Among these, dibutyltin dilaurate, dioctyltin dilaurate, bismuth carboxylate and resin acid bismuth salt are preferable from the viewpoint of compatibility with the release agent component and catalytic activity.

  When the urethanization catalyst is used, the content thereof is preferably 0.05 to 2.0 parts by mass, more preferably 0.1 to 1.5 parts by mass with respect to 100 parts by mass of the non-reactive polyolefin (A). Part, more preferably 0.1 to 1.0 part by weight. When this content is less than 0.05 parts by mass, the reaction promoting effect may not be sufficient, and when it exceeds 2.0 parts by mass, the peeling force of the release agent layer to be formed is increased, There may be a problem that the release agent pot life is shortened.

  In addition, content of a urethanization catalyst here refers to the quantity of only a urethanization catalyst, for example, when using a commercially available urethanization catalyst solution, the quantity of only the urethanization catalyst except the amount of solvents is meant.

[Formation of release agent layer]
The release agent layer can be formed, for example, by dissolving the above-described release agent component in a solvent, applying the solution to a substrate, and drying. The solid content of the release agent solution is not particularly limited in the present invention, but is usually in the range of 0.1 to 5% by mass.

  The solvent is not particularly limited as long as it can dissolve the release agent component uniformly. However, since the release agent of the present invention contains the non-reactive polyolefin (A) as an essential component, the solvent is preferably a mixed solvent of only one hydrocarbon solvent, two or more hydrocarbon solvents, Alternatively, it is a mixed solvent of a hydrocarbon solvent and another solvent. When a mixed solvent is used, the content of the hydrocarbon solvent is preferably 50% by mass or more, more preferably 70% by mass or more, and more preferably 90% by mass 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 and isopropyl alcohol.

  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.

2. Base Material The mold release material of the present invention is characterized in that the surface roughness Ra of the other surface of the base material on which the release agent layer is not formed is 0.1 μm or more. When the surface roughness Ra of the other surface of the base material is 0.1 μm or more, the base material and the release agent that come into contact with each other when the release material is wound into a roll or when the sheet-like release material is laminated. It can suppress effectively that a layer blocks. The surface roughness Ra is preferably 0.15 μm or more, more preferably 0.2 μm or more. On the other hand, if the surface roughness Ra is too large, the unevenness may be transferred to the surface of the release agent layer when the release material is rolled up. Therefore, the surface roughness Ra is preferably 1.0 μm or less, more preferably 0.6 μm or less.

  “Surface roughness Ra” in the present invention means the arithmetic average roughness specified in JIS B0601: 2001, and the measuring method conforms to the above-mentioned JIS.

  As the substrate, a plastic film is preferable. Examples of the plastic film include polyester films such as polyethylene terephthalate (PET) 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 substrate may be subjected to treatment such as corona treatment, plasma treatment, and flame treatment in advance as necessary.

  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.

  A substrate having a surface roughness Ra in a desired range can be produced by subjecting a commercially available substrate (for example, a plastic film) to a known surface roughening process (for example, a sand mat process).

3. Adhesive Tape with Release Material The release material of the present invention can be used, for example, for producing an adhesive tape with a release material. In this pressure-sensitive adhesive tape, the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape and the release agent layer of the release material of the present invention are in contact with each other.

  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 from an acrylic pressure-sensitive adhesive and a polyester pressure-sensitive adhesive exhibits stable peelability.

  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 on a substrate 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). 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 Reference Examples, Examples and Comparative Examples, but these do not limit the present invention. In the following, “part” and “%” represent “part by mass” and “% by mass”, respectively, unless otherwise specified.

1. Release agent component The release agent components used in Reference Examples, Examples and Comparative Examples are described below.

(1) Non-reactive polyolefin (A)

  “Tuffmer” shown in Table 1 is manufactured by Mitsui Chemicals, and “Engage” is manufactured by Dow Chemical. Further, “tensile modulus” and “tensile fracture stress” shown in Table 1 are both values at 23 ° C.

(2) Isocyanate (B)
Coronate L (75% ethyl acetate solution of trimethylolpropane adduct of tolylene diisocyanate, number of isocyanate groups in one molecule: 3, manufactured by Nippon Polyurethane Industry Co., Ltd.)
Takenate D110N (75% ethyl acetate solution of trimethylolpropane adduct of xylylene diisocyanate, 3 isocyanate groups in one molecule, manufactured by Mitsui Chemicals)

(3) Polyolefin polyol (C)
Epol (hydroxyl-terminated liquid hydrogenated polyisoprene, Mn = 2500, hydroxyl value 50.5 mgKOH / g, manufactured by Idemitsu Kosan Co., Ltd.)
Unistor P-801 (16% toluene solution of hydroxyl group-containing polyolefin, toluene removed product is solid, Mn] 5000, hydroxyl value 40 mgKOH / g, manufactured by Mitsui Chemicals)

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

(5) Urethane catalyst dibutyltin dilaurate (IV) (manufactured by Wako Pure Chemical Industries, Ltd., dibutyltin dilaurate)
Pucat B7 (58% mineral spirit solution of bismuth resinate, manufactured by Nippon Chemical Industry Co., Ltd.)

2. Reference Examples 1-7 and Comparative Examples 1-4
In order to investigate the influence of the release agent layer characteristics due to the difference in the non-reactive polyolefin (A), release materials were prepared in the following Reference Examples 1 to 7 and Comparative Examples 1 to 4, and the release materials thus prepared were the following (1) It evaluated by the method of (4). The evaluation results are shown in Table 2.

Reference example 1
Tuffmer P-0280 / Epol / Coronate L / Dibutyltin dilaurate (IV) = 100/2/3/1 (mass ratio of each solid content) dissolved in toluene to prepare a release agent solution with a solid content of 1.5% did. The release agent solution was applied to a polyester film having a thickness of 38 μm with a Meyer bar # 6, and then heated with a hot air dryer at 130 ° C. for 1 minute to prepare a release material. The thickness of the release agent layer of the obtained release material was about 150 nm.

Reference example 2
Same as Reference Example 1 except that the composition of the release agent was Toughmer P-0280 / Epol / Coronate L / Dibutyltin dilaurate (IV) = 100/2/10 / 0.2 (mass ratio of each solid content) The mold release material was produced by the method.

Reference example 3
The composition of the release agent was Toughmer P-0280 / Toughmer P-0080K / Epol / Coronate L / Dibutyltin dilaurate (IV) = 60/40/1/5 / 0.2 (mass ratio of each solid content) Except for the above, a release material was prepared in the same manner as in Reference Example 1.

Reference example 4
Same as Reference Example 1 except that the composition of the release agent was Toughmer P-0680 / Epol / Takenate D110N / Dibutyltin dilaurate (IV) = 100/1/5 / 0.2 (mass ratio of each solid content) The mold release material was produced by the method.

Reference Example 5
Reference Example 1 except that the composition of the release agent was Toughmer P-0280 / Toughmer A-35070S / Epol / Coronate L / Pucat B7 = 80/20/2/3 / 0.6 (mass ratio of each solid content) In the same manner as above, a release material was produced.

Reference Example 6
The composition of the release agent was Toughmer P-0280 / Toughmer A-1070S / Epol / Coronate L / Dibutyltin dilaurate (IV) = 90/10/1/5 / 0.2 (mass ratio of each solid content) Except for the above, a release material was prepared in the same manner as in Reference Example 1.

Reference Example 7
The composition of the release agent was Toughmer P-0280 / Toughmer A-35070S / Unistor P-801 / Coronate L / Dibutyltin dilaurate (IV) = 60/40/2/3 / 0.2 (mass ratio of each solid content) Except for the above, a release material was prepared in the same manner as in Reference Example 1.

Comparative Example 1
The same method as in Reference Example 1 except that the composition of the release agent was Engage 8180 / Epol / Coronate L / Dibutyltin dilaurate (IV) = 100/2/3 / 0.2 (mass ratio of each solid content) Thus, a release material was produced.

Comparative Example 2
The composition of the release agent was Toughmer P-0280 / Toughmer A-1070S / Epol / Coronate L / Dibutyltin dilaurate (IV) = 80/20/1/5 / 0.2 (mass ratio of each solid content) Except for the above, a release material was prepared in the same manner as in Reference Example 1.

Comparative Example 3
Same as Reference Example 1 except that the composition of the release agent was Toughmer A-1070S / Epol / Coronate L / Dibutyltin dilaurate (IV) = 100/1/5 / 0.2 (mass ratio of each solid content) The mold release material was produced by the method.

Comparative Example 4
Same as Reference Example 1 except that the composition of the release agent was Toughmer A-4085S / Epol / Coronate L / Dibutyltin dilaurate (IV) = 100/2/3 / 0.2 (mass ratio of each solid content) The mold release material was produced by the method.

(1) Adhesiveness of release agent layer to base material The state when the release agent layer surface was rubbed 3 times with a finger was determined according to the following criteria.
○: No change, or the surface becomes whitish and cloudy, but the release agent layer does not fall off.
X: A residue that appears when the release agent layer falls off and scrapes off the eraser is generated, and the substrate is exposed.

(2) Low speed peeling force (N / 50mm)
50 mm width acrylic adhesive tape no. A pressure-sensitive adhesive layer of 31B (manufactured by Nitto Denko Corporation) was bonded to the release agent layer of the release material using a hand roller to produce an adhesive tape with a release material. After this adhesive tape with a release material is stored at 23 ° C. for 24 hours, the release material is pulled in a 180 ° direction at a speed of 0.3 m / min with a tensile tester, and the peeling force measured in an atmosphere at 23 ° C. is peeled at a low speed. Force (N / 50 mm) was used. In the present invention, the low speed peeling force (N / 50 mm) is preferably 0.10 to 0.30 N / 50 mm, and more preferably 0.10 to 0.25 N / 50 mm.

(3) High speed peel force (N / 50mm)
Except that the tensile speed of the release material was changed to 3 m / min, the peel force was measured under the same conditions as the low speed peel force (N / 50 mm), and this peel force was defined as the high speed peel force (N / 50 mm). In the present invention, the high-speed peel force (N / 50 mm) is preferably 0.5 to 2.0 N / 50 mm, more preferably 0.5 to 1.5 N / 50 mm.

(4) Peeling speed dependence The value of the peeling speed dependence shown in Table 2 is a value obtained by dividing the high speed peeling force (N / 50 mm) by the low speed peeling force (N / 50 mm). This peeling rate dependency is preferably 7 or less, more preferably 6 or less, and most preferably 5 or less.

  In Reference Examples 1 to 7, mold release materials having a release agent layer having excellent adhesion to the substrate and having a small release rate dependency were obtained. In Comparative Examples 1 and 3, only the non-reactive polyolefin (A-2) having a tensile fracture stress at 23 ° C. exceeding 8 MPa was used as the non-reactive polyolefin (A). Sex has also increased. In Comparative Example 2, the non-reactive polyolefin (A-2) having a tensile fracture stress at 23 ° C. exceeding 8 MPa was used as much as 20% in the non-reactive polyolefin (A). Furthermore, in Comparative Example 4, as the non-reactive polyolefin (A), only the non-reactive polyolefin (A-2) having a tensile elastic modulus at 23 ° C. exceeding 10 MPa and a tensile breaking stress at 23 ° C. exceeding 8 MPa was used. Not only the high-speed peeling force but also the low-speed peeling force (N / 50 mm) was increased, and the dependency on the peeling speed was also increased.

3. Examples 1-4 and Comparative Examples 5 and 6
In order to examine the influence of blocking due to the surface roughness of the other surface of the base material on which the release agent layer is not formed, a release material was prepared in Examples 1 to 4 and Comparative Examples 5 and 6 below, The blocking of the mold material was evaluated by the following method (1). Moreover, the high speed peeling force (N / 25mm) of the mold release material of Examples 1-4 and Comparative Examples 5 and 6 was also evaluated by the following method (2). The evaluation results are shown in Table 3.

Example 1
One side of Lumirror S10 (manufactured by Toray Industries, Inc., thickness: 50 μm, surface roughness Ra: 0.04 μm) was roughened by sand mat treatment, and the surface roughness was adjusted to 0.28 μm. Further, Tuffmer P-0280 / Toughmer A-3570S / Epol / Coronate L / Dibutyltin dilaurate (IV) = 80/20/1/3 / 0.2 (mass ratio of each solid content) was dissolved in toluene to obtain a solid. A 1.5% min stripper solution was prepared. The release agent solution was applied to one roughened surface of the Lumirror S10 with a Meyer bar # 6, and then heated with a hot air dryer at 130 ° C. for 1 minute to prepare a release material. The thickness of the release agent layer of the obtained release material was about 150 nm.

Example 2
A mold release material was produced in the same manner as in Example 1 except that Lumirror S10 (PET film) having a surface roughness Ra on one side adjusted to 0.58 μm by sand mat treatment was used as a substrate.

Example 3
The composition of the release agent was Toughmer P-0280 / Toughmer A-35070S / Epol / Coronate L / Lucant HC-2000 / Dibutyltin dilaurate (IV) = 75/20/1/3/5 / 0.2 (each solid content The mold release material was produced in the same manner as in Example 1 except that the mass ratio of the release agent was changed. As in Example 1, Lumirror S10 (PET film) having a single-sided surface roughness Ra adjusted to 0.28 μm by sand mat treatment was used as a substrate.

Example 4
A mold release material was produced in the same manner as in Example 3 except that Lumirror S10 (PET film) having a surface roughness Ra on one side adjusted to 0.58 μm by sand mat treatment was used as a substrate.

Comparative Example 5
Lumirror S10 (PET film, surface roughness Ra: 0.04 μm) that has not been sand-matted is used as a substrate, and the composition of the release agent is Toughmer P-0280 / Toughmer A-3570S / Epol / Coronate L / A mold release material was produced in the same manner as in Example 1 except that dibutyltin dilaurate (IV) = 80/20/1/3 / 0.2 (mass ratio of each solid content).

Comparative Example 6
The composition of the release agent was Toughmer P-0280 / Toughmer A-35070S / Epol / Coronate L / Lucant HC-2000 / Dibutyltin dilaurate (IV) = 75/20/1/3/5 / 0.2 (each solid content The mold release material was produced in the same manner as in Comparative Example 5 except that the mass ratio was set to (Mass ratio).

(1) Blocking After the release material is cut into a size of 70 mm × 70 mm and the release material layer surface of the release material and the base material surface of another release material are in contact with each other, It was stored at 50 ° C. for 1 day with a 6 kg load. Thereafter, by peeling the overlapped release material by hand, blocking between the base material of the release material and the release agent layer was determined according to the following criteria.
○: No peeling resistance and no blocking.
X: There is peeling resistance and blocking.

(2) High speed peeling force (N / 25mm)
25 mm width acrylic adhesive tape no. Except for using 31B (manufactured by Nitto Denko Corporation), the high-speed peel force (N / 25 mm) was measured in the same manner as the measurement method of the high-speed peel force (N / 50 mm) in Reference Example 1 and the like.

  The release materials of Examples 1 to 4 (base surface roughness Ra: 0.28 μm or 0.58 μm) are compared to the release materials of Comparative Examples 5 and 6 (base surface roughness Ra: 0.04 μm). Thus, blocking was effectively suppressed.

  The release material of the present invention has a release agent layer having a small release rate dependency, and can effectively inhibit blocking when the substrate and the release agent layer are in contact with each other. Such a release material can be suitably used for various applications such as production of a pressure-sensitive adhesive tape with a release material.

Claims (8)

A release material having a base material and a release agent layer,
The release agent layer is formed on one side of a substrate from a release agent containing non-reactive polyolefin (A), isocyanate (B) and polyolefin polyol (C) that is solid at 38 ° C.,
The content of the non-reactive polyolefin (A) is 80% by mass or more in the release agent,
The non-reactive polyolefin (A) contains a non-reactive polyolefin (A-1) having a tensile modulus at 23 ° C. of 10 MPa or less and a tensile fracture stress at 23 ° C. of 8 MPa or less,
Content of non-reactive polyolefin (A-1) is 90 mass% or more in non-reactive polyolefin (A),
A release material in which the surface roughness Ra of the other surface of the substrate on which the release agent layer is not formed is 0.1 μm or more.   The mold release material according to claim 1, wherein the isocyanate (B) is a polyisocyanate having three or more isocyanate groups in one molecule.   The mold release material according to claim 2, wherein the polyisocyanate is at least one selected from the group consisting of an aromatic polyisocyanate and an alicyclic polyisocyanate.   The mold release material according to claim 3, 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.   Content of isocyanate (B) in a release agent is 0.5-20 mass parts with respect to 100 mass parts of non-reactive polyolefin (A), The isolation | separation as described in any one of Claims 1-4. Mold material.   The number average molecular weight of polyolefin polyol (C) is 1500-50000, The mold release material as described in any one of Claims 1-5.   The release agent according to claim 1, wherein the release agent further contains a liquid hydrocarbon (D) having a viscosity at 38 ° C of 5 to 1500 Pa · s.   The content of the liquid hydrocarbon (D) in the release agent is 3 to 30 parts by mass with respect to a total of 100 parts by mass of the non-reactive polyolefin (A) and the liquid hydrocarbon (D). Mold release material.