JP2023136330A - Resin composition and laminate - Google Patents

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

The present invention relates to a resin composition and a laminate.

BACKGROUND ART Conventionally, as a method for decorating the surface of an exterior component of a motorcycle or the like, a method of pasting a decorative film or a decorative sheet on the surface of the exterior component is known. A protective clear layer is provided on the outermost layer of the decorative film or sheet, and contributes to improving the appearance of the decorative film or sheet (see, for example, Patent Document 1).
In recent years, there has been a demand for high added value in decorative films and sheets. As an example, there is a demand for higher gloss in the protective clear layer, which greatly contributes to the appearance. However, a high-gloss clear layer cannot be obtained with a clear ink using a general acrylic resin. One way to obtain a high-gloss clear layer is to use a high-refractive-index resin. For example, it is being considered to use polystyrene, which is a high-refractive-index substance, to obtain a high-gloss clear layer. (For example, see Patent Document 2).

JP2017-048264A Japanese Patent Application Publication No. 2006-348116

From the viewpoint of decoration, the protective clear layer is required to have excellent printability during production, and since it is located on the outermost surface, it is also required to have excellent weather resistance.
However, it has become clear that the styrene-based resin-containing clear ink described in Patent Document 2 has poor printability because the generation of bubbles is observed in the appearance during printing. Furthermore, styrene resin-containing clear inks have poor weather resistance compared to general acrylic resin-containing clear inks. Note that there is room for improvement in the glossiness of common acrylic resin-containing clear inks.

An object of the present invention is to provide a resin composition having excellent printability and excellent gloss and weather resistance when made into a cured product, and a laminate having a resin layer containing the cured product of the resin composition. .

That is, the present invention includes the following aspects.
<1> A resin composition containing a resin having a structural unit derived from an aromatic-containing monomer having 9 or more carbon atoms.
<2> The resin composition according to <1>, wherein 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.
<3> The resin composition according to <1> or <2>, wherein the resin further contains a structural unit derived from a carboxyl group-containing monomer.
<4> The resin composition according to any one of <1> to <3>, wherein the resin further contains a structural unit derived from a hydroxyl group-containing monomer.
<5> The resin composition according to any one of <1> to <4>, wherein the aromatic-containing monomer is a (meth)acrylate-based aromatic-containing monomer.
<6> The resin composition according to <5>, wherein the (meth)acrylate aromatic-containing monomer is a (meth)acrylate aromatic-containing monomer having a benzyl group.
<7> The resin composition according to any one of <1> to <6>, wherein the resin has a glass transition temperature of 30°C to 75°C.
<8> A laminate comprising a base material and a resin layer containing a cured product of the resin composition according to any one of <1> to <7>, which is laminated on the base material.

According to the present invention, a resin composition having excellent printability and excellent gloss and weather resistance when made into a cured product, and a laminate having a resin layer containing the cured product of the resin composition are provided.

In the present disclosure, a numerical range indicated using "~" indicates a range that includes the numerical values written before and after "~" as the minimum and maximum values, respectively. Further, unless otherwise specified, the amount of each component in the composition is expressed as the total amount of the plurality of types of substances when each component contains a plurality of 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.

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

As a result of studies by the present inventors, a resin composition containing a structural unit derived from an aromatic-containing monomer having 9 or more carbon atoms (hereinafter also referred to as "resin of the present disclosure") has excellent printability, and a cured product It became clear that the gloss and weather resistance were excellent when The reason why the resin of the present disclosure exhibits high gloss when cured is considered to be that the aromatic-containing monomer is a high refractive index monomer like styrene. Polymers obtained from high refractive index monomers produce high refractive index resins. Further, when the aromatic-containing monomer has 9 or more carbon atoms, the resin composition containing the resin of the present disclosure has better printability than a resin composition containing a styrene resin, and has better weather resistance when made into a cured product. was found to be excellent.

[resin]
(Aromatic-containing monomer having 9 or more carbon atoms)
The resin of the present disclosure has a structural unit derived from an aromatic-containing monomer 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 improve. When transparency improves, glossiness also improves.
The (meth)acrylate aromatic monomer preferably has a benzyl group, phenyl group, tolyl group, xylyl group, naphthyl group, or anthracenyl group, and from the viewpoint of printability, the (meth)acrylate aromatic monomer has a benzyl group. More preferably, it is a group-containing monomer.
These aromatic-containing monomers having 9 or more carbon atoms may be used alone or in combination of two or more.

The resin of the present disclosure may contain 20% by mass or more of a structural unit derived from an aromatic-containing monomer having 9 or more carbon atoms, preferably 40% by mass or more, more preferably 45% by mass or more, and 50% by mass or more. % or more is more preferable. The resin of the present disclosure may contain 60% by mass or more, 70% by mass or more, 80% by mass or more, 85% by mass or more of structural units derived from aromatic-containing monomers having 9 or more carbon atoms. But that's fine. When the composition contains 40% by mass or more of a structural unit derived from an aromatic-containing monomer having 9 or more carbon atoms, the cured product tends to have better gloss.
Further, it is preferable that the structural unit derived from an aromatic-containing monomer having 9 or more carbon atoms is contained in an amount of 90% by mass or less, and more preferably 88% by mass or less. When the amount of structural units derived from aromatic 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 monomers having 9 or more carbon atoms is preferably 40% by mass to 90% by mass, more preferably 50% by mass to 90% by mass. preferable.

(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. Other monomers may be used alone or in combination of two or more.
Other monomers include carboxy 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, it has excellent curability. It is preferable that the carboxyl group-containing monomer and the hydroxyl group-containing monomer are each (meth)acrylic monomers.

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, and 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 Examples include (meth)acrylate, polypropylene glycol mono(meth)acrylate, polyethylene glycol mono(meth)acrylate, poly(ethylene glycol-propylene glycol) mono(meth)acrylate, pentaerythritol tri(meth)acrylate, and the like.
Examples of the (meth)acrylic monomer having a carboxy group include (meth)acrylic acid.

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 structural unit derived from a carboxyl group-containing monomer and the hydroxyl group-containing monomer in the resin of the present disclosure The content of the total amount of structural units derived from may be 5% by mass or more, or 10% by mass or more. When the content is 5% by mass or more, curability, weather resistance, and chemical resistance tend to be excellent.
Further, in the resin of the present disclosure, the total content of the structural units derived from the carboxy group-containing monomer and the structural units derived from the hydroxyl group-containing monomer may be 20% by mass or less, and may be 15% by mass or less. Good too. When the content is 20% by mass or less, the cured product tends to have excellent gloss.
In the resin of the present disclosure, the total content of the structural units derived from the carboxy group-containing monomer and the structural units derived from the hydroxyl group-containing monomer may be 5% by mass to 20% by mass, and may be 10% by mass to 20% by mass. It may be %.

Furthermore, an alkyl (meth)acrylate monomer may be used as another monomer. Examples of the alkyl (meth)acrylate 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 Examples include acrylate, isomyristyl (meth)acrylate, stearyl (meth)acrylate, cyclohexyl (meth)acrylate, isobornyl (meth)acrylate, and the like. The alkyl group of the alkyl (meth)acrylate may be linear, branched, or cyclic.

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 the alkyl (meth)acrylate monomer in the resin of the present disclosure may be 5% by mass or more. It may be 10% by mass or more. When the content is 5% by mass or more, compatibility with additives tends to be excellent.
Further, the content of the structural unit derived from the alkyl (meth)acrylate monomer in the resin of the present disclosure may be 70% by mass or less, or may be 50% by mass or less, and when made into a cured product. From the viewpoint of better gloss, the content is preferably 45% by mass or less, more preferably 40% by mass or less.
The content of the structural unit derived from the alkyl (meth)acrylate monomer in the resin of the present disclosure may be 0% by mass to 70% by mass, or 0% by mass to 45% by mass.

(Glass-transition temperature)
The glass transition temperature of the resin of the present disclosure is preferably 30°C or higher, more preferably 35°C or higher. When the glass transition temperature of the resin of the present disclosure is 30° C. or higher, printability tends to be excellent.
Further, the glass transition temperature of the resin of the present disclosure is preferably 95°C or lower, more preferably 80°C or lower, from the viewpoint of suppressing tack and improving blocking resistance when formed into a laminate. , more preferably 75°C or lower, 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 with a dynamic viscoelasticity measurement device.

(molecular weight)
The weight average molecular weight of the resin of the present disclosure is preferably 5,000 or more, more preferably 7,000 or more, and even more preferably 10,000 or more. When the weight average molecular weight of the resin of the present disclosure is 5,000 or more, the resin composition has an appropriate viscosity and tends to have excellent printability.
Further, 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 has an appropriate viscosity and tends to have excellent printability.
The weight average molecular weight of the resin of the present disclosure is preferably 5,000 to 30,000.

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

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

That is, 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 even more preferably 95% by mass or more. It is particularly preferable that

[Other ingredients]
The resin composition of the present disclosure may contain other components other than the resin of the present disclosure. Other components include crosslinking agents, solvents, leveling agents, antifoaming agents, ultraviolet absorbers, light stabilizers, antioxidants, plasticizers, surfactants, colorants, brightening agents, fillers, and the like.

(Crosslinking agent)
The crosslinking agent is not particularly limited, but is preferably a multimer 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 hydrogenated products thereof, diphenylmethane diisocyanate, hexamethylene diisocyanate (HMDI), and isophorone diisocyanate. It will be done. Among the above, HMDI is preferred from the viewpoint of suppressing yellowing. The crosslinking agents may be used alone or in combination of two or more.

When using a crosslinking agent, the content of the crosslinking agent in the resin composition is an amount such that the crosslinkable group in the crosslinking agent is 0.8 equivalent to 1.1 equivalent with respect to the crosslinkable functional group of the resin of the present disclosure. It is preferable that For example, the amount may be 1% by mass to 20% by mass based on 100 parts by mass of the resin of the present disclosure.

(solvent)
Examples of solvents include cyclohexanone, isophorone, diacetone alcohol, acetone, methyl ethyl ketone, methyl isobutyl ketone, ketone solvents such as methyl cyclohexanone, ethyl acetate, propyl acetate, butyl acetate, propylene glycol monomethyl ether acetate, butyl cellosolve acetate, carbitol acetate, etc. ester solvents, 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 chlorobenzene and dichlorobenzene. Examples include halogenated solvents such as The solvents may be used alone or in combination of two or more.

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 is the value of the relative rate of each solvent when the evaporation rate of butyl acetate is set to 1. There is a relationship that the smaller the numerical value of 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.

(Leveling agent)
Examples of the leveling agent include fluorine-based leveling agents, silicon-based leveling agents, and acrylic-based leveling agents. When the resin composition contains a leveling agent, the leveling agent is oriented on the surface of the coating film when the resin composition dries, and by equalizing the surface tension of the coating film, appearance defects such as floating mottling and repelling are prevented. At the same time, wetting with the base film is improved. Specific examples of the leveling agent include "Polyflow" (an acrylic leveling agent manufactured by Kyoeisha Kagaku Co., Ltd.), "Disparon" (Kusumoto Kasei Co., Ltd.), and "BYK" (BYK Japan). . The leveling agents may be used alone or in combination of two or more.

(antifoaming agent)
As the antifoaming agent, ultraviolet absorber, and light stabilizer, known ones can be used as appropriate. Examples of antifoaming agents include "DOWSIL" (Dow Toray Industries, Inc., silicone defoaming agent), "Shin-Etsu Silicone" (Shin-Etsu Chemical Co., Ltd.), TSF451 series, TFH450 series (Momentive Performance Materials). ), etc. The antifoaming agents may be used alone or in combination of two or more.
When using an antifoaming agent, the content of the antifoaming agent is preferably 0.1 part by mass to 0.5 part by mass based on 100 parts by mass of the resin of the present disclosure.

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

When using a UV absorber, the content of the UV absorber is preferably 1 part by mass to 3 parts by mass based on 100 parts by mass of the resin of the present disclosure. When using a light stabilizer, the content of the light stabilizer is preferably 1 part by mass to 3 parts by mass based on 100 parts by mass of the resin of the present disclosure. When a UV absorber and a light stabilizer are used together, the total amount of the UV absorber and light stabilizer is preferably 2 parts by mass to 6 parts by mass based on 100 parts by mass of the resin of the present disclosure.

(colorant)
As the colorant, any known colorant can be used as appropriate, but pigments are preferred.

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

<Laminated body>
The laminate of the present disclosure includes a base material and a resin layer that is laminated on the base material and includes a cured product of the resin composition described above. The laminate may include other members such as a pressure-sensitive adhesive layer and an adhesive layer for adhering to an adherend as necessary. Furthermore, a printed layer may be provided between the resin layer and the base material.

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

Resins that can be used as base materials include polyvinyl chloride, polyvinylidene chloride, polyvinylidene fluoride, poly(ethylene-tetrafluoroethylene), polycarbonate, polyester, poly(meth)acrylate, polyolefin, polyamide, polyvinyl alcohol, polystyrene, Examples include polyurethane. These resins may be used alone or in combination of two or more. When two or more types of resins are used together, they may be used in combination, or two or more types of base materials made of different resins may be used in combination.
Among the above, polyvinyl chloride has excellent adhesion with the resin layer, and thus tends to suppress peeling of the resin layer from the laminate.

The resin layer containing the cured product of the resin composition is formed by applying the resin composition described above onto the base material or a printing layer provided as necessary, and curing the resin composition. The coating method of the resin composition is not particularly limited, and examples include screen printing, gravure printing, bar coating, knife coating, roll coating, blade coating, die coating, spray coating, electrostatic coating, dip coating, etc. It will be done. 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.

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

When the laminate includes a printed layer between the resin layer and the base material, the method for forming the printed layer is not particularly limited. For example, it is formed by applying a resin composition containing a resin, a colorant, a solvent, etc. onto a base material by a method such as screen printing, and subjecting it to steps such as drying and curing as necessary.

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

EXAMPLES Hereinafter, the present invention will be specifically illustrated by examples, but the present invention is not limited to these examples in any way.

[Example 1]
(1) Preparation of base material As a base material, an adhesive-treated polyvinyl chloride film (manufactured by Nippon Carbide Industries Co., Ltd., trade name "Hi-Scal 0010H") was used.

(2) Printing with color ink Red ink (manufactured by Teikoku Ink Manufacturing Co., Ltd., product name "VK911"), blue ink (manufactured by Teikoku Ink Manufacturing Co., Ltd., product name "VK391"), green ink (manufactured by Teikoku Ink Manufacturing Co., Ltd., product name "VK791"), yellow ink (manufactured by Teikoku Ink Manufacturing Co., Ltd., product name "VK247"), white ink (manufactured by Teikoku Ink Manufacturing Co., Ltd., product name "VK247"), , trade name "VK661"), and (manufactured by Teikoku Ink Manufacturing Co., Ltd., trade name "VK911") was used as the black ink.
To 70 parts by mass of each ink of each color, 30 parts by mass of butyl cellosolve acetate (manufactured by Daishin Kagaku Co., Ltd.)/Solvesso 100 (manufactured by ExxonMobil Japan LLC) = 50/50 volume % mixed solvent was added. Color inks of each color were prepared. The prepared colored inks were printed on a substrate to form an ink layer.

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

Table 1 shows the weight average molecular weight (Mw) and glass transition temperature (Tg) of the resin.
In Table 1, BZMA is benzyl methacrylate (11 carbon atoms), BZA is benzyl acrylate (10 carbon atoms), PheMA is phenyl methacrylate (10 carbon atoms), St is styrene (8 carbon atoms), and 2HEMA is 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.

The above resin composition was printed on the base material or on the ink layer as a base layer using a semi-automatic screen printing machine manufactured by Seria Corporation to a thickness of 7 μm at 180 mesh. The printing conditions were: scan speed: 300 mm/sec, squeegee printing pressure: 0.2 MPa, squeegee hardness: 70 to 75°, squeegee push amount: 0.5 mm, squeegee angle: 70°, and clearance: 4.00 mm. After coating, heat drying was performed for 60 minutes in an atmosphere of 80° C. using a hot air dryer to form a resin layer. Sample 1 is a sample in which a resin layer is formed on a base material, and Sample 2 is a sample in which a resin layer is formed on an ink layer.

(4) Evaluation (4-1) Glossiness Regarding Sample 2, the glossiness was measured at an acceptance angle of 60° using an all-in-one glossmeter IQ (manufactured by Rhopoint Instrument) based on JIS Z 8741:1997.
The sample was an A4 size sheet, and a total of N=9 measurements were made on the left, center, and right at the top, middle, and bottom, respectively, and the average value was used for evaluation. The evaluation criteria are as follows. In addition, when making a judgment based on the following evaluation criteria, the sample of the color with the lowest glossiness among the samples having ink layers of each color was evaluated. For example, in Example 1, the glossiness of a sample having ink layers of blue ink and green ink was evaluated using the following evaluation criteria. The evaluation results are shown in Table 2.

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

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

-Evaluation criteria-
A: Immediately after drying, there is no problem in appearance.
B: Immediately after drying, there is citrus skin and foaming.
F: Foaming occurred immediately after printing, or separation from the screen plate was poor.

(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 weather resistance. The evaluation criteria are as follows. The evaluation results are shown in Table 2.

-Evaluation criteria-
A: No problem in appearance.
F: Yellowing occurs or the gloss level is significantly reduced.

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

From the results in Table 2, it was found that the resin compositions of Examples 1 to 10 had excellent printability and, when cured, had 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, had poorer gloss than the Examples.
In addition, in Comparative Example 2, in which the resin used has a structural unit derived from an aromatic-containing monomer but the number of carbon atoms in the aromatic-containing monomer is less than 9, foaming was confirmed during printing, and the printability was inferior to that of the example. was.

Claims (8)

A resin composition containing a resin having a structural unit derived from an aromatic monomer having 9 or more carbon atoms. The resin composition according to claim 1, wherein the resin contains 40% by mass to 90% by mass of structural units derived from the aromatic monomer having 9 or more carbon atoms. The resin composition according to claim 1 or 2, wherein the resin further contains a structural unit derived from a carboxy group-containing monomer. The resin composition according to any one of claims 1 to 3, wherein the resin further contains a structural unit derived from a hydroxyl group-containing monomer. The resin composition according to any one of claims 1 to 4, wherein the aromatic-containing monomer is a (meth)acrylate-based aromatic-containing monomer. The resin composition according to claim 5, wherein the (meth)acrylate aromatic-containing monomer is a (meth)acrylate aromatic-containing monomer having a benzyl group. The resin composition according to any one of claims 1 to 6, wherein the resin has a glass transition temperature of 30°C to 75°C. A laminate comprising a base material and a resin layer containing a cured product of the resin composition according to any one of claims 1 to 7, which is laminated on the base material.