Resin composition and laminate

Abstract

To provide a resin composition which is excellent in printability, and is excellent in glossiness and weather resistance when being formed into a cured product, and a laminate having a resin layer containing a cured product of the resin composition.SOLUTION: A resin composition contains a resin having a constitutional unit derived from an aromatic group-containing monomer having 9 or more carbon atoms.SELECTED DRAWING: None

Description

[Technical Field]

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

[0002] A conventional method for decorating the surface of an exterior part of a motorcycle or the like involves attaching a decorative film or decorative sheet to the surface of the exterior part. A protective clear layer is provided on the outermost layer of the decorative film or decorative sheet, which contributes to improving the appearance of the decorative film or decorative sheet (see, for example, Patent Document 1). In recent years, there has been a demand for high added value in decorative films and decorative sheets. As an example, there is a demand for high gloss protective clear layers, which greatly contribute to the appearance. However, a high gloss clear layer cannot be obtained with a clear ink that uses a general acrylic resin. One method for obtaining a high gloss clear layer is to use a high refractive index resin, and for example, the use of polystyrene, a high refractive index material, to obtain a high gloss clear layer has been considered (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-048264 [Patent Document 2] Japanese Patent Application Laid-Open No. 2006-348116 Summary of the Invention [Problem to be solved by the invention]

[0004] The protective clear layer is required to have excellent printability during production from the viewpoint of decorative properties, and furthermore, since it is located on the outermost surface, it is required to have excellent weather resistance. However, it has been revealed that the styrene-based resin-containing clear ink described in Patent Document 2 has poor printability because air bubbles are observed on the surface during printing. Furthermore, the styrene-based resin-containing clear ink has poor weather resistance compared to general acrylic resin-containing clear ink. Furthermore, there is room for improvement in glossiness of general acrylic resin-containing clear ink.

[0005] The present invention aims to provide a resin composition that has excellent printability and, when cured, has excellent gloss and weather resistance, and a laminate having a resin layer containing a cured product of the resin composition. [Means for solving the problem]

[0006] That is, the present invention includes the following aspects. <1> A resin composition containing a resin having structural units derived from an aromatic-containing monomer having 9 or more carbon atoms. <2> the resin contains 40% by mass to 90% by mass of structural units derived from the aromatic-containing monomer having 9 or more carbon atoms; <1> The resin composition according to claim 1. <3> The resin further contains a structural unit derived from a carboxy group-containing monomer. <1> or <2> The resin composition according to claim 1. <4> The resin further contains a structural unit derived from a hydroxyl group-containing monomer. <1> ~ <3> The resin composition according to any one of the above. <5> The aromatic-containing monomer is a (meth)acrylate-based aromatic-containing monomer. <1> ~ <4> A resin composition according to any one of the above items. <6> The (meth)acrylate aromatic-containing monomer is a (meth)acrylate aromatic-containing monomer having a benzyl group. <5> Resin composition. <7> The glass transition temperature of the resin is 30°C to 75°C. <1> ~ <6> The resin composition according to any one of the above. <8> a substrate and a film laminated on the substrate <1> ~ <7> and a resin layer containing a cured product of the resin composition according to any one of the above items. [Effects of the Invention]

[0007] According to the present invention, there are provided a resin composition which has excellent printability and, when cured, has excellent gloss and weather resistance, and a laminate having a resin layer containing a cured product of the resin composition. DETAILED DESCRIPTION OF THE INVENTION

[0008] In this disclosure, numerical ranges indicated using "to" indicate ranges that include the numerical values ​​before and after "to" as the minimum and maximum values, respectively. Furthermore, unless otherwise specified, the amount of each component in a composition is expressed as the total amount of multiple types of substances when each component contains multiple types of substances. In the present disclosure, (meth)acrylic means one or both of acrylic and methacrylic, and (meth)acrylate means one or both of acrylate and methacrylate.

[0009] <Resin composition> The resin composition of the present disclosure contains a resin having structural units derived from an aromatic-containing monomer having 9 or more carbon atoms.

[0010] As a result of investigations by the present inventors, it has been found that a resin composition containing a resin having structural units derived from an aromatic-containing monomer having 9 or more carbon atoms (hereinafter also referred to as the "resin of the present disclosure") has excellent printability and, when formed into a cured product, has excellent gloss and weather resistance. The reason why the resin of the present disclosure has high gloss when formed into a cured product is thought to be that the aromatic-containing monomer, like styrene, is a high refractive index monomer. A polymer obtained from a high refractive index monomer produces a high refractive index resin. It has also been found that when the aromatic-containing monomer has 9 or more carbon atoms, the resin composition containing the resin of the present disclosure has excellent printability and, when formed into a cured product, has excellent weather resistance compared to a resin composition containing a styrene-based resin.

[0011] [resin] (aromatic-containing monomers with 9 or more carbon atoms) The resin of the present disclosure has structural units derived from aromatic-containing monomers having 9 or more carbon atoms. From the viewpoint of copolymerizability with other monomers, the number of carbon atoms in the aromatic-containing monomer is preferably 20 or less, more preferably 15 or less, and even more preferably 12 or less. The aromatic-containing monomer having 9 or more carbon atoms is preferably a (meth)acrylate-based aromatic-containing monomer. When the aromatic-containing monomer is a (meth)acrylate-based aromatic-containing monomer, transparency tends to be improved. Improved transparency also improves gloss. Furthermore, the (meth)acrylate aromatic-containing monomer preferably has a benzyl group, a phenyl group, a tolyl group, a xylyl group, a naphthyl group, or an anthracenyl group, and from the viewpoint of printability, it is more preferable that the (meth)acrylate aromatic-containing monomer has a benzyl group. These aromatic-containing monomers having 9 or more carbon atoms may be used alone or in combination of two or more.

[0012] The resin of the present disclosure may contain 20% by mass or more, preferably 40% by mass or more, more preferably 45% by mass or more, and even more preferably 50% by mass or more of structural units derived from aromatic-containing monomers having 9 or more carbon atoms. The resin of the present disclosure may contain 60% by mass or more, 70% by mass or more, 80% by mass or more, or 85% by mass or more of structural units derived from aromatic-containing monomers having 9 or more carbon atoms. When the resin contains 40% by mass or more of structural units derived from aromatic-containing monomers having 9 or more carbon atoms, the gloss of the cured product tends to be superior. Furthermore, the content of structural units derived from aromatic-containing monomers having 9 or more carbon atoms is preferably 90% by mass or less, and more preferably 88% by mass or less. When the content of structural units derived from aromatic-containing monomers having 9 or more carbon atoms is 90% by mass or less, polymerizability during resin production is excellent. In the resin of the present disclosure, the content of structural units derived from aromatic-containing monomers having 9 or more carbon atoms is preferably 40% by mass to 90% by mass, and more preferably 50% by mass to 90% by mass.

[0013] (Other monomers) The resin of the present disclosure may further have a structural unit derived from a monomer other than the aromatic-containing monomer having 9 or more carbon atoms. The other monomer may be used alone, or two or more types may be used in combination. Examples of other monomers include carboxyl group-containing monomers and hydroxyl group-containing monomers. When the resin of the present disclosure has at least one of a structural unit derived from a carboxyl group-containing monomer and a structural unit derived from a hydroxyl group-containing monomer, the resin has excellent curability. The carboxyl group-containing monomer and the hydroxyl group-containing monomer are each preferably a (meth)acrylic monomer.

[0014] Examples of (meth)acrylic monomers having a hydroxyl group include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 3-methyl-3-hydroxybutyl (meth)acrylate, 1,3-dimethyl-3-hydroxybutyl (meth)acrylate, 2,2,4-trimethyl-3-hydroxypentyl (meth)acrylate, 2-ethyl-3-hydroxyhexyl (meth)acrylate, polypropylene glycol mono(meth)acrylate, polyethylene glycol mono(meth)acrylate, poly(ethylene glycol-propylene glycol) mono(meth)acrylate, and pentaerythritol tri(meth)acrylate. Examples of the (meth)acrylic monomer having a carboxy group include (meth)acrylic acid.

[0015] When the resin of the present disclosure has at least one of a structural unit derived from a carboxyl group-containing monomer and a structural unit derived from a hydroxyl group-containing monomer, the total content of the structural units derived from the carboxyl group-containing monomer and the structural units derived from the hydroxyl group-containing monomer in the resin of the present disclosure may be 5% by mass or more, or may be 10% by mass or more. When this content is 5% by mass or more, the resin tends to have excellent curability, weather resistance, and chemical resistance. Furthermore, the total content of structural units derived from carboxyl group-containing monomers and structural units derived from hydroxyl group-containing monomers in the resin of the present disclosure may be 20% by mass or less, or 15% by mass or less. When this content is 20% by mass or less, the gloss of the cured product tends to be excellent. In the resin of the present disclosure, the total content of structural units derived from carboxyl group-containing monomers and structural units derived from hydroxyl group-containing monomers may be 5% by mass to 20% by mass, or may be 10% by mass to 20% by mass.

[0016] Furthermore, alkyl (meth)acrylate monomers may be used as other monomers. Examples of alkyl (meth)acrylates include methyl (meth)acrylate, ethyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, sec-butyl (meth)acrylate, t-butyl (meth)acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, n-nonyl (meth)acrylate, isononyl (meth)acrylate, n-decyl (meth)acrylate, n-dodecyl (meth)acrylate, isomyristyl (meth)acrylate, stearyl (meth)acrylate, cyclohexyl (meth)acrylate, and isobornyl (meth)acrylate. The alkyl group of the alkyl (meth)acrylate may be linear, branched, or cyclic.

[0017] When the resin of the present disclosure has a structural unit derived from an alkyl(meth)acrylate monomer, the content of the structural unit derived from an alkyl(meth)acrylate monomer in the resin of the present disclosure may be 5% by mass or more, or may be 10% by mass or more. When this content is 5% by mass or more, the resin tends to have excellent compatibility with additives. Furthermore, the content of structural units derived from alkyl (meth)acrylate monomers in the resin of the present disclosure may be 70% by mass or less, or 50% by mass or less, and from the viewpoint of achieving better gloss when formed into a cured product, it is preferably 45% by mass or less, and more preferably 40% by mass or less. In the resin of the present disclosure, the content of structural units derived from alkyl (meth)acrylate monomers may be 0% by mass to 70% by mass, or 0% by mass to 45% by mass.

[0018] (glass transition temperature) The glass transition temperature of the resin of the present disclosure is preferably 30° C. or higher, and more preferably 35° C. or higher. When the resin of the present disclosure has a glass transition temperature of 30° C. or higher, it tends to have excellent printability. Furthermore, from the viewpoint of suppressing tack and improving blocking resistance when formed into a laminate, the glass transition temperature of the resin of the present disclosure is preferably 95°C or lower, more preferably 80°C or lower, still more preferably 75°C or lower, and particularly preferably 50°C or lower. The glass transition temperature of the resin of the present disclosure is preferably 30°C to 95°C. The glass transition temperature of the resin of the present disclosure can be measured using a dynamic viscoelasticity measuring device.

[0019] (molecular weight) The weight-average molecular weight of the resin of the present disclosure is preferably at least 5,000, more preferably at least 7,000, and even more preferably at least 10,000. When the weight-average molecular weight of the resin of the present disclosure is at least 5,000, the resin composition tends to have an appropriate viscosity and excellent printability. The weight average molecular weight of the resin of the present disclosure is preferably 30,000 or less, more preferably 25,000 or less, and may be 20,000 or less. When the weight average molecular weight of the resin of the present disclosure is 30,000 or less, the resin composition tends to have an appropriate viscosity and excellent printability. The weight average molecular weight of the resin of the present disclosure is preferably 5,000 to 30,000.

[0020] The weight-average molecular weight of the resin of the present disclosure can be determined by gel permeation chromatography using a standard polystyrene conversion method. More specifically, the weight-average molecular weight can be determined using a Tosoh Corporation "HLC-8220" GPC analysis system, two Tosoh Corporation "TSKgel Super Multipore HZ-H" columns connected in series, a differential refractometer (RI) built into the GPC analysis system as a detector, tetrahydrofuran as a mobile phase, a flow rate of 0.35 mL / min, and a column temperature of 40°C.

[0021] [Other resins] The resin composition of the present disclosure may contain a resin other than the resin of the present disclosure. Examples of the other resin include resins known in the art. However, from the viewpoint of effectively achieving the effects of the present invention, the proportion of the other resin in the entire resin is preferably 40% by mass or less, more preferably 20% by mass or less, even more preferably 10% by mass or less, and particularly preferably 5% by mass or less.

[0022] In other words, the content of the resin of the present disclosure in the entire resin is preferably 60% by mass or more, more preferably 80% by mass or more, even more preferably 90% by mass or more, and particularly preferably 95% by mass or more.

[0023] [Other ingredients] The resin composition of the present disclosure may contain components other than the resin of the present disclosure, such as a crosslinking agent, a solvent, a leveling agent, an antifoaming agent, an ultraviolet absorber, a light stabilizer, an antioxidant, a plasticizer, a surfactant, a colorant, a metallic pigment, and a filler.

[0024] (Crosslinking agent) The crosslinking agent is not particularly limited, but is preferably a polymer of a compound having two or more isocyanate groups in one molecule. Examples of compounds having two or more isocyanate groups in one molecule include tolylene diisocyanate (TDI), xylylene diisocyanate (XDI) and their hydrogenated products, diphenylmethane diisocyanate, hexamethylene diisocyanate (HMDI), and isophorone diisocyanate. Among these, HMDI is preferred from the viewpoint of suppressing yellowing. The crosslinking agent may be used alone or in combination of two or more types.

[0025] When a crosslinking agent is used, the content of the crosslinking agent in the resin composition is preferably an amount such that the crosslinkable groups in the crosslinking agent are 0.8 to 1.1 equivalents relative to the crosslinkable functional groups in the resin of the present disclosure, for example, 1 to 20% by mass relative to 100 parts by mass of the resin of the present disclosure.

[0026] (solvent) Examples of the solvent include ketone solvents such as cyclohexanone, isophorone, diacetone alcohol, acetone, methyl ethyl ketone, methyl isobutyl ketone, and methylcyclohexanone; ester solvents such as ethyl acetate, propyl acetate, butyl acetate, propylene glycol monomethyl ether acetate, butyl cellosolve acetate, and carbitol acetate; aliphatic hydrocarbon solvents such as hexane, cyclohexane, octane, mineral spirits, and kerosene; aromatic hydrocarbon solvents such as toluene, xylene, and 1,2,4-trimethylbenzene; and halogenated solvents such as chlorobenzene and dichlorobenzene. The solvents may be used alone or in combination of two or more.

[0027] When using the resin composition for screen printing, it is preferable to use a solvent with an evaporation rate ratio of 0.3 or less. Here, the evaporation rate ratio refers to the relative rate value of each solvent when the evaporation rate of butyl acetate is set to 1. The smaller the evaporation rate ratio of the solvent, the slower the evaporation rate. When the resin composition contains a solvent with an evaporation rate ratio of 0.3 or less, plate drying during screen printing is suppressed, and workability tends to improve.

[0028] (Leveling agent) Examples of leveling agents include fluorine-based leveling agents, silicon-based leveling agents, and acrylic leveling agents. When the resin composition contains a leveling agent, the leveling agent orients on the coating film surface when the resin composition dries, uniformizing the surface tension of the coating film, thereby preventing poor appearance such as unevenness and cissing, and improving wetting with the substrate film. Specific examples of leveling agents include "Polyflow" (an acrylic leveling agent manufactured by Kyoeisha Chemical Co., Ltd.), "Disparlon" (Kusumoto Chemical Co., Ltd.), and "BYK" (BYK Japan). The leveling agents may be used alone or in combination of two or more types.

[0029] (Antifoaming agent) Known antifoaming agents, UV absorbers, and light stabilizers can be used as appropriate. Examples of antifoaming agents include "DOWSIL" (Dow-Toray Co., Ltd., silicone-based antifoaming agent), "Shin-Etsu Silicone" (Shin-Etsu Chemical Co., Ltd.), the TSF451 series, and the TFH450 series (Momentive Performance Materials). One type of antifoaming agent may be used alone, or two or more types may be used in combination. When an antifoaming agent is used, the content of the antifoaming agent is preferably 0.1 to 0.5 parts by mass relative to 100 parts by mass of the resin of the present disclosure.

[0030] (UV absorbers, light stabilizers) As the ultraviolet absorber and light stabilizer, known ones can be used as appropriate. Examples of ultraviolet absorbers include "Tinuvin 400" (BASF). Examples of light stabilizers include "Tinuvin 770" (BASF). The ultraviolet absorbers and light stabilizers may be used alone or in combination of two or more.

[0031] When an ultraviolet absorber is used, the content of the ultraviolet absorber is preferably 1 to 3 parts by mass relative to 100 parts by mass of the resin of the present disclosure. When a light stabilizer is used, the content of the light stabilizer is preferably 1 to 3 parts by mass relative to 100 parts by mass of the resin of the present disclosure. When an ultraviolet absorber and a light stabilizer are used in combination, the total amount of the ultraviolet absorber and the light stabilizer is preferably 2 to 6 parts by mass relative to 100 parts by mass of the resin of the present disclosure.

[0032] (coloring agent) As the colorant, any known colorant can be used as appropriate, but pigments are preferred.

[0033] (Applications, etc.) The resin composition of the present disclosure can be used to form various coating layers, and is preferably used to form a protective clear layer. The method for applying the resin composition is not particularly limited, and can be performed by screen printing, gravure printing, bar coating, knife coating, roll coating, blade coating, die coating, spray coating, electrostatic coating, dip coating, etc.

[0034] <Laminate> The laminate of the present disclosure includes a substrate and a resin layer containing a cured product of the resin composition described above, laminated on the substrate. The laminate may optionally include other components such as a pressure-sensitive adhesive layer or adhesive layer for adhering to an adherend. A printed layer may also be provided between the resin layer and the substrate.

[0035] The material of the substrate is not particularly limited. Examples include resin, metal, ceramic, paper, wood, and combinations thereof. The thickness of the substrate is not particularly limited and can be selected depending on the application. The thickness of the substrate can be, for example, in the range of 20 μm to 500 μm, and preferably in the range of 30 μm to 100 μm.

[0036] Resins that can be used as the substrate include polyvinyl chloride, polyvinylidene chloride, polyvinylidene fluoride, poly(ethylene-tetrafluoroethylene), polycarbonate, polyester, poly(meth)acrylate, polyolefin, polyamide, polyvinyl alcohol, polystyrene, polyurethane, etc. These resins may be used alone or in combination of two or more. When two or more resins are used in combination, they may be mixed or two or more substrates made of different resins may be combined. Among the above, polyvinyl chloride has excellent adhesion to the resin layer, and therefore tends to prevent the resin layer from peeling off from the laminate.

[0037] The resin layer containing the cured product of the resin composition is formed by applying the above-mentioned resin composition to a substrate or a printed layer provided as needed, and curing it. The method for applying the resin composition is not particularly limited, and examples thereof include screen printing, gravure printing, bar coating, knife coating, roll coating, blade coating, die coating, spray coating, electrostatic coating, and dip coating. Among these, screen printing is preferred. The method for curing the resin composition is not particularly limited, and can be performed using hot air drying, an oven, a hot plate, or the like.

[0038] The thickness of the resin layer is not particularly limited and can be selected depending on the application, and can be, for example, in the range of 1 μm to 100 μm, and preferably in the range of 3 μm to 20 μm.

[0039] When the laminate includes a printed layer between the resin layer and the substrate, the method for forming the printed layer is not particularly limited. For example, the printed layer can be formed by applying a resin composition containing a resin, a colorant, a solvent, etc. to the substrate by a method such as screen printing, and optionally undergoing steps such as drying and curing.

[0040] The resin layer in the laminate of the present disclosure has excellent printability, suppresses foaming during coating, and has excellent gloss and weather resistance, making it suitable for use as a film, sticker, or the like to be attached to, for example, a vehicle body or an object installed outdoors. [Example]

[0041] The present invention will be specifically illustrated below with reference to examples, but the present invention is not limited to these examples in any way.

[0042] Example 1 (1) Preparation of the substrate An adhesive-treated polyvinyl chloride film (manufactured by Nippon Carbide Industries Co., Ltd., trade name "Haiescal 0010H") was used as the substrate.

[0043] (2) Color ink printing The red ink used was Teikoku Ink Mfg. Co., Ltd., product name "VK911"; the blue ink used was Teikoku Ink Mfg. Co., Ltd., product name "VK391"; the green ink used was Teikoku Ink Mfg. Co., Ltd., product name "VK791"; the yellow ink used was Teikoku Ink Mfg. Co., Ltd., product name "VK247"; the white ink used was Teikoku Ink Mfg. Co., Ltd., product name "VK661"; and the black ink used was Teikoku Ink Mfg. Co., Ltd., product name "VK911". Each color ink was prepared by adding 30 parts by mass of a 50 / 50 volume% mixed solvent of butyl cellosolve acetate (manufactured by Taishin Chemical Co., Ltd.) and Solvesso 100 (manufactured by ExxonMobil Japan LLC) to 70 parts by mass of each ink. The prepared color ink was printed on a substrate to form an ink layer.

[0044] (3) Formation of resin layer A composition was prepared by adding 100 parts by weight of a resin synthesized from monomers having the composition (parts by weight) shown in Table 1, 0.50 parts by weight of an antifoaming agent, 2.0 parts by weight of an ultraviolet absorber, and 2.0 parts by weight of a light stabilizer. To this composition, 14 parts by weight of an HMDI-based crosslinking agent (manufactured by Nippon Polyurethane Industry Co., Ltd., product name "Coronate HK", solids content 100.0 mass%) and 11 parts by weight of a 50 / 50 vol% mixed solvent of butyl cellosolve acetate (manufactured by Taishin Chemical Co., Ltd.) / Solvesso 100 (manufactured by ExxonMobil Japan LLC) as a diluent, to prepare the resin composition of Example 1.

[0045] The weight average molecular weight (Mw) and glass transition temperature (Tg) of the resin are shown in Table 1. In Table 1, BZMA represents benzyl methacrylate (11 carbon atoms), BZA represents benzyl acrylate (10 carbon atoms), PheMA represents phenyl methacrylate (10 carbon atoms), St represents styrene (8 carbon atoms), 2HEMA represents 2-hydroxyethyl methacrylate, 2HEA represents 2-hydroxyethyl acrylate, AA represents acrylic acid, MMA represents methyl methacrylate, n-BA represents n-butyl acrylate, and n-BMA represents n-butyl methacrylate.

[0046] The above resin composition was printed on the substrate or on the ink layer serving as a base layer using a semi-automatic screen printer manufactured by Ceria Corporation at a 180 mesh screen to a thickness of 7 μm. The printing conditions were: scan speed: 300 mm / sec, squeegee pressure: 0.2 MPa, squeegee hardness: 70-75°, squeegee depression: 0.5 mm, squeegee angle: 70°, and clearance: 4.00 mm. After coating, the composition was dried by heating in an 80°C atmosphere for 60 minutes using a hot air dryer to form a resin layer. The sample in which the resin layer was formed on the substrate was designated Sample 1, and the sample in which the resin layer was formed on the ink layer was designated Sample 2.

[0047] (4) Evaluation (4-1) Glossiness For Sample 2, the gloss was measured at a light receiving angle of 60° using an all-in-one gloss meter IQ (manufactured by Rhopoint Instruments) in accordance with JIS Z 8741:1997. The measured samples were A4 size sheets, and measurements were taken on the top, middle, and bottom left, center, and right sides, with a total of 9 measurements, and evaluation was based on the average value. The evaluation criteria were as follows. When judging according to the following evaluation criteria, the sample with the lowest gloss level among the samples having ink layers of each color was used for evaluation. For example, in Example 1, the gloss of samples having ink layers of blue ink and green ink was judged according to the following evaluation criteria. The evaluation results are shown in Table 2.

[0048] -Evaluation criteria- A: Glossiness Gs (60°) is 93.0 or more. B: The gloss level Gs(60°) is 91.0 or more and less than 93.0. C: The gloss level Gs(60°) is 90.0 or more and less than 91.0. F: Glossiness Gs(60°) is less than 90.0.

[0049] (4-2) Printability In producing Sample 1, the appearance of the resin composition was observed immediately after printing or immediately after drying, and printability was evaluated. The evaluation criteria were as follows. The evaluation results are shown in Table 2.

[0050] -Evaluation criteria- A: Immediately after drying, there is no problem with the appearance. B: Immediately after drying, there is a citrus peel and foaming. F: Foaming occurs immediately after printing or the screen is not easily separated.

[0051] (4-3) Weather resistance Sample 1 was placed in an accelerated weather resistance tester (Sunshine Weather Meter, S-WOM) for 1000 hours, and then its appearance was observed to evaluate its weather resistance. The evaluation criteria were as follows. The evaluation results are shown in Table 2.

[0052] -Evaluation criteria- A: There is no problem with the appearance. F: Yellowing occurs or gloss is significantly reduced.

[0053] [Examples 2 to 10, Comparative Examples 1 and 2] Samples 1 and 2 of Examples 2 to 10 and Comparative Examples 1 and 2 were prepared in the same manner as in Example 1 except that the resin composition was changed as shown in Table 1, and were evaluated in the same manner as in Example 1.

[0054] [Table 1]

[0055] [Table 2]

[0056] The results in Table 2 show that the resin compositions of Examples 1 to 10 have excellent printability, and when cured, have excellent gloss and weather resistance. On the other hand, Comparative Example 1, which used a resin that did not have a structural unit derived from an aromatic-containing monomer, was inferior in gloss to the Examples. In addition, in Comparative Example 2, in which the resin used had structural units derived from aromatic-containing monomers but the aromatic-containing monomers had less than 9 carbon atoms, foaming was observed during printing, and the printability was inferior to that of the Examples.

Claims

1. The composition contains a resin having a structural unit derived from an aromatic-containing monomer having 9 or more carbon atoms, the aromatic-containing monomer having 9 or more carbon atoms is a (meth)acrylate-based aromatic-containing monomer having a benzyl group or a phenyl group, the resin contains 85% by mass to 90% by mass of structural units derived from the aromatic-containing monomer having 9 or more carbon atoms, the resin further contains a structural unit derived from a (meth)acrylic monomer having a carboxy group and a structural unit derived from a (meth)acrylic monomer having a hydroxyl group, and the total content of the structural unit derived from the (meth)acrylic monomer having a carboxy group and the structural unit derived from the (meth)acrylic monomer having a hydroxyl group is 10% by mass to 15% by mass; The resin composition, wherein the glass transition temperature of the resin is 30°C to 50°C.

2. A resin composition according to claim 1, wherein the aromatic-containing monomer having 9 or more carbon atoms is a (meth)acrylate-based aromatic-containing monomer having a benzyl group.

3. A resin composition described in claim 1 or claim 2, wherein the resin further contains a structural unit derived from an alkyl (meth)acrylate monomer.

4. A resin composition described in any one of claims 1 to 3, wherein the resin has a weight average molecular weight of 5,000 to 30,000.

5. A resin composition described in any one of claims 1 to 4, used to form a protective clear layer.

6. A laminate comprising a substrate and a resin layer comprising a cured product of the resin composition according to any one of claims 1 to 5 laminated on the substrate.

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