Resin laminate and resin composition

Abstract

To provide a resin laminate capable of repeatedly imparting hydrophilicity to the surface of a base material, in other words, capable of imparting hydrophilicity with excellent durability, and a resin composition capable of forming the resin laminate.SOLUTION: The resin laminate 10 of the present invention includes a resin layer 11 and a fine uneven structure 111 formed on one surface of the resin layer 11, in which the resin layer 11 contains a resin material and an amine compound having both an amine group and a polar group, and the fine uneven structure 111 is formed of a crystallized product of an amine salt of carbamic acid derived from the amine compound.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a resin laminate and a resin composition. [Background technology]

[0002] In recent years, forming a hydrophilic layer having hydrophilic properties on the surface of a substrate as a coating layer has been proposed as a method for imparting hydrophilic properties to the surface of a substrate (see, for example, Patent Document 1).

[0003] However, conventional coating layers (hydrophilic layers) have had the problem that once the coating layer is worn away due to physical effects such as abrasion, the effect of providing the coating layer, i.e., the effect of imparting hydrophilicity to the surface of the substrate, is lost. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2021-178739 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a resin laminate that can repeatedly impart hydrophilicity to the surface of a substrate, in other words, that can impart hydrophilicity with excellent durability, and a resin composition that can form such a resin laminate. [Means for solving the problem]

[0006] These objects can be achieved by the present invention as set forth in (1) to (10) below. (1) A resin laminate comprising a resin layer and a microrelief structure formed on one surface of the resin layer, the resin layer includes a resin material and an amine compound having both an amine group and a polar group, The resin laminate is characterized in that the fine uneven structure is composed of an amine salt of carbamic acid derived from the amine compound.

[0007] (2) The resin laminate according to (1), wherein the amine compound is a diamine compound having an amine group as the polar group.

[0008] (3) The resin laminate according to (2), wherein the diamine compound is a linear alkyldiamine.

[0009] (4) The resin laminate according to (3) above, wherein the linear alkyldiamine has a melting point of 25° C. or higher and 60° C. or lower.

[0010] (5) The resin laminate according to any one of (1) to (4) above, wherein the content of the amine compound in the resin layer is 1.0% by weight or more and 10.0% by weight or less.

[0011] (6) The resin laminate according to any one of (1) to (5) above, wherein the resin material is a polyolefin resin.

[0012] (7) The resin laminate according to any one of (1) to (6) above, wherein the amine salt of carbamic acid is a reaction product produced by reacting the amine compound with carbon dioxide.

[0013] (8) The resin laminate according to any one of (1) to (7) above, wherein the contact angle of pure water on the surface of the resin laminate on the side of the fine concave-convex structure is 40° or less.

[0014] (9) The resin laminate according to any one of (1) to (8) above, further comprising a substrate located on the side of the resin layer opposite to the fine concave-convex structure.

[0015] (10) A resin composition used to form the resin laminate according to any one of (1) to (9) above, A resin composition comprising the resin material and the amine compound. [Effects of the Invention]

[0016] According to the present invention, in a resin laminate comprising a resin layer and a fine uneven structure formed on one surface of the resin layer, the resin layer contains a resin material and an amine compound having both an amine group and a polar group, and the fine uneven structure is composed of an amine salt of carbamic acid derived from the amine compound contained in the resin layer.

[0017] In this way, the fine uneven structure is composed of an amine salt of carbamic acid derived from an amine compound having both an amine group and a polar group, and therefore the fine uneven structure is imparted with hydrophilicity based on the polar groups contained in this fine uneven structure (amine salt of carbamic acid).

[0018] Furthermore, even if the fine unevenness is consumed by physical action such as abrasion of the fine unevenness, the amine compound remaining in the resin layer can be supplied to one side of the resin layer to regenerate the fine unevenness composed of the crystallized product of the amine salt of carbamic acid derived from the amine compound. Therefore, by forming the resin laminate of the present invention on the surface of a substrate, hydrophilicity can be repeatedly imparted to the surface of the substrate, that is, hydrophilicity can be imparted to the surface of the substrate with excellent durability. Furthermore, according to the present invention, a resin composition capable of forming the above-mentioned resin laminate can be obtained. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a longitudinal sectional view showing an embodiment of a resin laminate of the present invention. [Figure 2] 1 is an electron microscope photograph of the surface on the side of the fine concave-convex structure in the resin laminate of Example 3. DETAILED DESCRIPTION OF THE INVENTION

[0020] DETAILED DESCRIPTION OF THE INVENTION The resin laminate and resin composition of the present invention will be described in detail below based on preferred embodiments shown in the accompanying drawings.

[0021] A resin laminate according to an embodiment is a resin laminate comprising a resin layer and a fine uneven structure formed on one surface of the resin layer, wherein the resin layer contains a resin material and an amine compound having both an amine group and a polar group, and the fine uneven structure is composed of an amine salt of carbamic acid derived from the amine compound.

[0022] According to the resin laminate of this embodiment, the resin layer contains a resin material and an amine compound having both an amine group and a polar group, and therefore the fine uneven structure is composed of an amine salt of carbamic acid derived from the amine compound contained in the resin layer.

[0023] In this way, the fine uneven structure is composed of an amine salt of carbamic acid derived from an amine compound having both an amine group and a polar group, and the fine uneven structure is imparted with hydrophilicity based on the polar groups contained in this fine uneven structure (amine salt of carbamic acid).

[0024] Furthermore, even if the fine unevenness is consumed due to physical effects such as abrasion of the fine unevenness, the amine compound remaining in the resin layer can be supplied to one side of the resin layer to regenerate the fine unevenness composed of the amine salt of carbamic acid derived from the amine compound. Therefore, by forming the resin laminate according to the embodiment on the surface of a substrate, hydrophilicity can be repeatedly imparted to the surface of the substrate, that is, hydrophilicity can be imparted to the surface of the substrate with excellent durability.

[0025] <Resin laminate> Fig. 1 is a longitudinal sectional view showing an embodiment of the resin laminate of the present invention. For convenience of explanation, the upper side of Fig. 1 will be referred to as "top" and the lower side as "bottom".

[0026] In this embodiment, as shown in Figure 1, the resin laminate 10 has a resin layer 11 and a fine uneven structure 111 formed on the upper surface (one surface) of the resin layer 11, and is laminated in this order from the substrate 20 side to the substrate 20 side on the lower surface side of the resin layer 11 (the surface side opposite the fine uneven structure 111 of the resin layer 11).

[0027] As a result, the resin laminate 10 forms a coating layer (covering layer) that covers the upper surface of the substrate 20. The fine uneven structure 111 located on the upper surface of the resin laminate 10 exhibits hydrophilicity as described below. Therefore, hydrophilicity can be imparted to the substrate 20 on which the resin laminate 10 is provided as a coating layer. Each layer that constitutes this resin laminate 10 will be described below.

[0028] The resin layer 11 contains a resin material as a main material and an amine compound having both an amine group and a polar group (hereinafter, sometimes simply referred to as "amine compound") dispersed in the resin material.

[0029] The resin material (base resin) is included as the main material of the resin layer 11, and has the function of retaining the amine compound dispersed in the resin layer 11. The resin material also has the function of supplying the amine compound to the upper surface of the resin layer 11 when the fine concave-convex structure 111 is worn away by physical action such as abrasion of the fine concave-convex structure 111.

[0030] In this specification, the term "main material" refers to a constituent material that accounts for 50% by weight or more in each layer.

[0031] The resin material is not particularly limited as long as it is compatible with the amine compound so as to exhibit the above-mentioned function. Examples include polyolefin resins such as polyethylene resins and polypropylene resins, acrylic resins, polystyrene resins, polyester resins such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), polycarbonate resins, vinyl chloride resins, and polyacetal resins. One or more of these may be used in combination. Among these, polyolefin resins are preferred. Polyolefin resins are preferably selected as resin materials because they are relatively inexpensive and easily available. Furthermore, polyolefin resins are resin materials that exhibit relatively low interaction with amine compounds. Therefore, polyolefin resins can reliably maintain the amine compound in a substantially uniformly dispersed state in the resin layer 11. Furthermore, when the microrelief structure 111 is consumed, the polyolefin resin can reliably supply the amine compound to the upper surface of the resin layer 11.

[0032] Examples of the polyolefin resin include polyethylene resins such as low-density polyethylene (LDPE) and high-density polyethylene (HDPE), α-olefin resins (α-olefin homopolymers) as homopolymers of α-olefins such as propylene, butene, pentene, and hexene, and α-olefin copolymers as copolymers of α-olefins. Among these, α-olefin copolymers are preferably used as the polyolefin resin, and ethylene-propylene copolymers are more preferably used. This allows the above-mentioned effects to be more significantly exhibited.

[0033] The content of the resin material in the resin layer 11 is not particularly limited, but is preferably 75% by weight to 98% by weight, and more preferably 85% by weight to 95% by weight. By setting the content of the resin material within the above range, the resin layer 11 can reliably exhibit the above functions.

[0034] The amine compound is a compound having both an amine group and a polar group. When the amine compound is contained in the resin layer 11, an amine salt of carbamic acid derived from the amine compound is precipitated on the upper surface of the resin layer 11, and the fine uneven structure 111 is formed.

[0035] More specifically, by incorporating an amine compound into the resin layer 11, the amine compound is actively supplied to the upper surface of the resin layer 11. Then, the amine compound reacts with carbon dioxide contained in the air, converting the amine compound into a carbamate. As a result, an amine salt of carbamic acid is produced as a reaction product on the upper surface of the resin layer 11, and a microrelief structure 111 composed of a crystallized product of this amine salt is formed. The amine salt of carbamic acid has a polar group derived from the amine compound. This imparts hydrophilicity to the microrelief structure 111.

[0036] This amine compound has both an amine group and a polar group. The polar group is not particularly limited, but examples thereof include an amine group (amino group), a phosphate group, a hydroxyl group, a carboxyl group, an ester group, and an epoxy group. Among these, the polar group is preferably an amine group. That is, the amine compound is preferably a diamine compound having an amine group as the polar group. Diamine compounds are relatively easy to obtain as amine compounds having both an amine group and a polar group. Furthermore, diamine compounds are useful in that they can reliably form the microrelief structure 111, exhibit hydrophilicity, and the like.

[0037] Furthermore, the diamine compound is not particularly limited as long as it has two amine groups within the compound, and examples thereof include linear alkyldiamines, branched alkyldiamines, and cyclic alkyldiamines. Among these, linear alkyldiamines are preferred. Linear alkyldiamines have two amine groups, one at each end of a linear alkyl group. Therefore, when one amine group forms an amine salt of carbamic acid, the linear alkyl group ensures a sufficient distance (separation distance) between the other amine group and the other amine group. By ensuring such a separation distance, the other amine group can be exposed on the surface of the microrelief structure 111 composed of the linear alkyldiamine (diamine compound). Therefore, excellent hydrophilicity can be imparted to the microrelief structure 111.

[0038] Examples of such linear alkyldiamines include 1,5-pentanediamine, 1,6-hexanediamine, 1,7-heptanediamine, 1,8-octanediamine, and 1,9-nonanediamine, and these can be used alone or in combination of two or more.

[0039] This linear alkyldiamine preferably has a carbon number of 5 or more and 9 or less, more preferably 6 or more and 8 or less. The linear alkyldiamine also preferably has a melting point of 25°C or more and 60°C or less, more preferably 35°C or more and 55°C or less. By setting the carbon number and melting point of the linear alkyldiamine within the above ranges, the other amine group of the linear alkyldiamine can be reliably exposed on the surface of the microrelief structure 111 made of the linear alkyldiamine. This reliably imparts excellent hydrophilicity to the microrelief structure 111.

[0040] The content of the amine compound in the resin layer 11 is not particularly limited, but is preferably 1.0 wt % or more and 10.0 wt % or less, and more preferably 3.0 wt % or more and 7.0 wt % or less. By setting the content of the amine compound within the above range, the resin layer 11 can reliably exhibit the above-mentioned functions. That is, the amine compound can be stably and continuously supplied to the upper surface of the resin layer 11. Therefore, the fine uneven structure 111 composed of a crystallized product of an amine salt of carbamic acid can be reliably formed. Furthermore, even if the fine uneven structure 111 is consumed due to physical effects such as abrasion of the fine uneven structure 111, the fine uneven structure 111 can be reliably regenerated.

[0041] The average thickness of the resin layer 11 is preferably, for example, about 1 μm or more and 1000 μm or less, and more preferably about 10 μm or more and 200 μm or less. By setting the average thickness of the resin layer 11 within the above range, the amine compound can be continuously supplied to the upper surface of the resin layer 11. Therefore, even if the fine uneven structure 111 is consumed due to physical effects such as abrasion of the fine uneven structure 111, the fine uneven structure can be regenerated multiple times.

[0042] The resin layer 11 may contain additives other than the resin materials and amine compounds described above. The additives are not particularly limited, but examples thereof include lubricants, antioxidants, plasticizers, light stabilizers, colorants, antistatic agents, flame retardants, and fillers, which may be used alone or in combination.

[0043] The fine uneven structure 111 is formed on the upper surface of the resin layer 11 and is composed of an amine salt of carbamic acid derived from an amine compound contained in the resin layer 11. This makes it possible to impart hydrophilicity to the resin laminate 10 (resin layer 11). Therefore, the resin laminate 10 functions as a coating layer for imparting hydrophilicity to the surface of the substrate 20.

[0044] As described above, the microrelief structure 111 is a structure (self-assembled film) made of an amine salt of carbamic acid, which is generated when an amine compound contained in the resin layer 11 precipitates (leaches) onto the upper surface of the resin layer 11 and reacts with carbon dioxide contained in the atmosphere. In the microrelief structure 111, the amine salt of carbamic acid is derived from an amine compound having both an amine group and a polar group. Therefore, the polar group is exposed on the surface of the microrelief structure 111. Therefore, the microrelief structure 111 has hydrophilic properties. Furthermore, since the microrelief structure 111 is formed by the amine compound contained in the resin layer 11 precipitating onto the upper surface of the resin layer 11, even if the microrelief structure 111 is worn down due to physical effects such as abrasion, it can be regenerated by reprecipitation. Therefore, in this embodiment, the hydrophilic microrelief structure 111 has excellent durability.

[0045] Furthermore, this fine uneven structure 111 is a self-assembled film formed by the aggregation and rearrangement of crystallized products of the amine salt of carbamic acid, and its shape is not particularly limited and may be, for example, pyramidal, conical, prismatic, cylindrical, needle-like, or scale-like. Furthermore, the shape of the fine uneven structure 111 may be uniform or non-uniform.

[0046] When the fine uneven structure 111 is columnar or pyramidal, the average height of the convex portions is preferably set within a range of 10 nm to 3000 nm, more preferably 15 nm to 2000 nm, and the average pitch between the convex portions is preferably set within a range of 10 nm to 1500 nm, more preferably 15 nm to 1000 nm.

[0047] When the fine uneven structure 111 is scale-like, the average thickness of the convex portions is preferably set within a range of 1 nm to 3000 nm, more preferably 5 nm to 2000 nm. Furthermore, the average length of the convex portions is preferably set within a range of 10 nm to 5000 nm, more preferably 15 nm to 3000 nm. Furthermore, the average height of the convex portions is preferably set within a range of 1 nm to 3000 nm, more preferably 5 nm to 2000 nm.

[0048] By forming the fine concave-convex structure 111 as described above, it is possible to reliably impart hydrophilicity to the upper surface of the resin laminate 10 (resin layer 11).

[0049] The average height of the convex portions, the average pitch between the convex portions, the average thickness of the convex portions, and the average length of the convex portions in the fine concave-convex structure 111 can be obtained as follows.

[0050] First, the microrelief structure 111 is magnified and observed using an electron microscope or optical microscope to obtain an observation image. Next, 10 or more convex portions shown in the observation image are randomly selected, and their height, pitch, thickness, and length are measured. Next, the measured values ​​are averaged to obtain the average height of the convex portions, the average pitch between the convex portions, the average thickness of the convex portions, and the average length of the convex portions.

[0051] The degree of hydrophilicity of the microrelief structure 111 can be expressed by the magnitude of the contact angle of pure water on the upper surface of the resin laminate 10. Specifically, the contact angle of pure water on the upper surface of the resin laminate 10 is preferably 40° or less, and more preferably approximately 10° or more and 30° or less. By setting the magnitude of the contact angle of pure water to the above upper limit or less, it can be said that excellent hydrophilicity is imparted to the upper surface of the resin laminate 10 (resin layer 11).

[0052] The base material 20 is provided with hydrophilicity by forming the resin laminate 10 thereon. The constituent materials for the substrate 20 are not particularly limited, and examples thereof include various metal materials, various metal oxide materials, various glass materials, various resin materials, various fiber materials, etc., and one or more of these can be used in combination.

[0053] Specific examples of such substrates 20 include, but are not limited to, the bottoms of ships, window components of moving bodies such as automobiles, aircraft, railway vehicles, ships, and spacecraft, metal bodies of the moving bodies, rain gear such as umbrellas and raincoats, various film components, and building materials for wet areas such as kitchens, bathtubs, washbasins, and toilets.

[0054] (Method for forming a resin laminate) The resin laminate 10 having the above-described configuration can be formed through a resin layer forming step in which a resin composition containing a resin material and an amine compound is applied to the upper surface of the substrate 20 and then cooled to form the resin layer 11, and a fine uneven structure forming step in which the amine compound is precipitated on the upper surface of the resin layer 11 and carbamate-converted (produces an amine salt of carbamic acid) by reacting with carbon dioxide in the atmosphere, thereby forming the fine uneven structure 111. Each of these steps will be described in turn below.

[0055] [1] Resin layer formation process First, a substrate 20 on which the resin laminate 10 is to be formed is prepared, and then a resin composition (resin composition according to the embodiment) containing a resin material and an amine compound is applied (supplied) to the upper surface of the substrate 20, followed by cooling. As a result, a resin layer 11 is formed on the upper surface of the substrate 20.

[0056] (1-1) First, a substrate 20 on which the resin laminate 10 is to be formed is prepared, and a resin composition containing a resin material and an amine compound is prepared.

[0057] The substrate 20 is an object on which the resin laminate 10 is formed, as described above. That is, the substrate 20 is an object to which hydrophilicity is imparted.

[0058] The resin composition contains the resin material and the amine compound as described above, and also contains a solvent as needed.

[0059] The solvent is not particularly limited, and examples thereof include acetone, acetonitrile, N,N-dimethylformamide (DMF), dimethyl sulfoxide (DMSO), 1,3-dimethyl-2-imidazolidinone (DMI), acetic acid, methanol, ethanol, propanol, butanol, ethylenediamine, hexane, benzene, toluene, diethyl ether, chloroform, ethyl acetate, and tetrahydrofuran, and one or more of these can be used in combination.

[0060] The resin composition is prepared, for example, by kneading a resin material, an amine compound, and, if necessary, a solvent while heating the mixture to a temperature equal to or higher than the glass transition point or melting point of the resin material.

[0061] (1-2) Next, the prepared resin composition is applied (supplied) to the upper surface of the substrate 20 and then cooled to form the resin layer 11.

[0062] The method for applying the resin composition is not particularly limited, and examples thereof include known methods such as roll coating, flow coating, spray coating, curtain coating, dip coating, die coating, and bar coating, which may be used alone or in combination. This allows the resin composition to be applied to the upper surface of the substrate 20 in a uniform thickness.

[0063] [2] Fine uneven structure formation process Next, an amine compound is deposited on the upper surface of the resin layer 11, and is carbamate-converted (produces an amine salt of carbamic acid) by reacting with carbon dioxide in the atmosphere, thereby forming the fine relief structure 111.

[0064] The amine compound is precipitated by, for example, exposing the resin layer 11 to the atmosphere, which actively supplies the amine compound to the upper surface of the resin layer 11 and causes it to exude. Specifically, for example, the resin layer 11 may be exposed to the atmosphere at room temperature for 8 hours or more.

[0065] When the amine compound is precipitated on the upper surface of the resin layer 11 in this manner, the amine compound reacts with carbon dioxide contained in the air to form an amine salt of carbamic acid. Then, as this precipitation of the amine compound and the reaction between the amine compound and carbon dioxide continue continuously, a crystallized product of the amine salt of carbamic acid is deposited on the upper surface of the resin layer 11. As a result, a microrelief structure 111 composed of the amine salt of carbamic acid is formed.

[0066] When reacting the amine compound with carbon dioxide, high-concentration carbon dioxide may be sprayed onto the surface of the resin layer 11. This improves the efficiency of the reaction between the amine compound and carbon dioxide, and allows the fine uneven structure 111 to be formed efficiently.

[0067] As described above, a resin laminate 10 can be obtained on the substrate 20 through a simple process in which a resin composition containing a resin material and an amine compound is supplied to the upper surface of the substrate 20 to form a resin layer 11, and then the resin layer 11 is exposed to conditions in which the amine compound reacts with carbon dioxide to form a fine uneven structure 111.

[0068] Furthermore, even if the fine uneven structure 111 obtained through this process is consumed by physical action, it can be regenerated by resupplying the amine compound to the surface of the resin layer 11. Therefore, excellent hydrophilicity can be maintained for a long period of time.

[0069] Although the resin laminate and resin composition of the present invention have been described above, the present invention is not limited thereto.

[0070] For example, each part constituting the resin laminate can be replaced with any other component that can exert the same function. Also, any other component may be added.

[0071] In addition, in the above embodiment, the resin laminate is formed on one side of the substrate to function as a coating layer, but this is not limited to this. For example, the resin laminate may be formed alone in the form of a substrate or film and used as a hydrophilic substrate or film. [Example]

[0072] The present invention will be described in more detail below with reference to examples, although the present invention is not limited to these examples in any way.

[0073] 1. Raw material preparation First, the raw materials used in the production of the resin laminate 10 are shown below.

[0074] (resin material) As the resin material, polypropylene (manufactured by Clariant Japan, product number LICOCENEPP 2602 GR) was prepared.

[0075] (Amine Compound 1) As an amine compound 1 (linear alkyldiamine) having two amine groups, 1,4-butanediamine (manufactured by Tokyo Chemical Industry Co., Ltd., melting point: 27° C.) having four carbon atoms was prepared.

[0076] (Amine compound 2) As an amine compound 2 (linear alkyldiamine) having two amine groups, 1,6-hexanediamine having six carbon atoms (manufactured by Tokyo Chemical Industry Co., Ltd., melting point: 42° C.) was prepared.

[0077] (Amine compound 3) As an amine compound 3 (linear alkyldiamine) having two amine groups, 1,8-octanediamine (manufactured by Tokyo Chemical Industry Co., Ltd., melting point: 50° C.) having eight carbon atoms was prepared.

[0078] 2. Preparation of resin composition for forming resin laminate 10 Example 1 A resin composition of Example 1 used for forming the resin laminate 10 was prepared by kneading a mixture of 95 parts by weight of a resin material and 5 parts by weight of an amine compound 1.

[0079] <Examples 2 and 3> Resin compositions of Examples 2 and 3 were prepared in the same manner as in Example 1, except that the amine compounds shown in Table 1 were used in the preparation of the resin compositions.

[0080] <Comparative Example> A comparative resin composition was prepared in the same manner as in Example 1, except that the addition of the amine compound to the resin composition was omitted. That is, a resin composition composed solely of a resin material (polypropylene) was prepared as the comparative resin composition.

[0081] 3. Formation of resin laminate First, a copper plate measuring 10 cm long, 10 cm wide, and 0.05 mm thick was prepared as the substrate 20. Next, the resin compositions of each of the examples and comparative examples were applied in a molten state to the upper surface of the copper plate using an applicator, and then cooled. As a result, a resin layer 11 with an average thickness of 1.0 mm was formed on the upper surface of the copper plate.

[0082] Next, the resin layer 11 formed on the upper surface of the copper plate was exposed to atmospheric conditions of 25°C and 50% RH for 8 hours to form a fine uneven structure 111 on the upper surface of the resin layer 11. In this manner, the resin laminates 10 of the respective Examples and Comparative Examples were formed on the upper surface of the substrate 20 (copper plate).

[0083] 4. Evaluation The resin laminates 10 of the respective Examples and Comparative Examples were evaluated by the following methods.

[0084] <1> Confirmation of the formation of a fine uneven structure in a resin laminate (electron microscope observation) The upper surface of the fine concave-convex structure 111 of the resin laminate 10 of each of the examples and comparative examples was observed using an electron microscope (SEM).

[0085] FIG. 2 shows an electron microscope photograph of the upper surface of the resin laminate 10 of Example 3, which was obtained by observation with the electron microscope.

[0086] 2, in the resin laminate 10 of Example 3, a scale-like microrelief structure 111 was formed on the upper surface of the resin layer 11. The scales (protrusions) constituting the microrelief structure 111 had an average thickness of 30 nm, an average length of 2500 nm, and an average height of 1500 nm.

[0087] Furthermore, in the resin laminates 10 of Examples 1 and 2, similar to Example 3, the formation of a scale-shaped microrelief structure 111 was observed on the upper surface of the resin layer 11. The average thickness, average length, and average height of the scales (protrusions) constituting these microrelief structures 111 were as shown in Table 1.

[0088] <2> Confirmation of the formation of a fine uneven structure in a resin laminate (FT-IR analysis) The fine uneven structure 111 formed in the resin laminate 10 of Example 3 was observed by FT-IR using the ATR method. The obtained FT-IR spectrum contained COO - (1399cm -1 ), NH3 + (1486cm -1 ) and NHCOO - (1567cm -1 ) was observed. This result indicated that in the microrelief structure 111, 1,8-octanediamine that had exuded onto the upper surface of the resin layer 11 reacted with carbon dioxide (CO2) in the air to generate an amine carbamate salt.

[0089] <3> Hydrophilicity test of resin laminate (first time) For each of the resin laminates 10 of the Examples and Comparative Examples, the contact angle E1 [°] of pure water on the top surface of the fine concave-convex structure 111 of the resin laminate 10 was measured.

[0090] <4> Hydrophilicity test of resin laminate (when recycled) For each of the resin laminates 10 of the Examples and Comparative Examples, jersey cotton was moved back and forth 10 times under a load of 1 kgf on the top surface of the microrelief structure 111 of the resin laminate 10. This removed the microrelief structure 111 from the top surface of the resin layer 11. When the surface on which the jersey cotton had been moved back and forth was observed with an electron microscope (SEM), it was confirmed that the microrelief structure 111 had been removed.

[0091] Thereafter, the resin laminates 10 of the respective Examples and Comparative Examples were exposed to the atmosphere at 25° C. and 50% RH for 24 hours, thereby regenerating the fine relief structure 111 on the upper surface of the resin layer 11.

[0092] The above-described removal and regeneration of the fine concave-convex structure 111 was counted as one cycle, and this was repeated four times. Thereafter, the contact angle E2 [°] of pure water on the top surface of the fine concave-convex structure 111 of the resin laminate 10 was measured.

[0093] The evaluation results of the resin laminates 10 of the Examples and Comparative Examples obtained as described above are shown in Table 1 below.

[0094] [Table 1]

[0095] As shown in Table 1, in the resin laminates of each Example, a fine uneven structure was formed and regenerated on the upper surface of the resin layer, and as a result, hydrophilicity could be repeatedly imparted to the upper surface of the resin laminate. In other words, hydrophilicity could be imparted to the surface of the substrate with excellent durability.

[0096] In contrast, in the resin laminate of the comparative example, it was revealed that the upper surface of the resin laminate could not be made hydrophilic because the fine uneven structure was not formed or reproduced, i.e., it was revealed that hydrophilicity could not be imparted to the surface of the substrate. [Explanation of symbols]

[0097] 10 Resin laminate 11 Resin layer 20 Base material 111 Fine uneven structure

Claims

1. A resin laminate comprising a resin layer and a microrelief structure formed on one surface of the resin layer, the resin layer includes a resin material and an amine compound having both an amine group and a polar group, The resin laminate is characterized in that the fine uneven structure is composed of an amine salt of carbamic acid derived from the amine compound.

2. 2. The resin laminate according to claim 1, wherein the amine compound is a diamine compound having an amine group as the polar group.

3. The resin laminate according to claim 2 , wherein the diamine compound is a linear alkyldiamine.

4. 4. The resin laminate according to claim 3, wherein the linear alkyldiamine has a melting point of 25°C or higher and 60°C or lower.

5. 2. The resin laminate according to claim 1, wherein the content of the amine compound in the resin layer is 1.0% by weight or more and 10.0% by weight or less.

6. The resin laminate according to claim 1 , wherein the resin material is a polyolefin resin.

7. 2. The resin laminate according to claim 1, wherein the amine salt of carbamic acid is a reaction product produced by reacting the amine compound with carbon dioxide.

8. 2. The resin laminate according to claim 1, wherein the contact angle of pure water on the surface of the resin laminate on the side of the fine concave-convex structure is 40° or less.

9. The resin laminate according to claim 1 , further comprising a substrate located on the side of the resin layer opposite to the fine concave-convex structure.

10. A resin composition used to form the resin laminate according to claim 1, A resin composition comprising the resin material and the amine compound.

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