JP5040274B2 - Method for producing composition for forming hard coat layer - Google Patents

Description

  The present invention relates to a composition for forming a hard coat layer having high transmittance, high hardness, high stability, and alkali resistance, a laminate using the same, and a method for producing the same.

  Plastic films represented by polyethylene terephthalate film, triacetyl cellulose film, polypropylene film, polyethylene film, polystyrene film, polycarbonate film are bonded to glass, metal, wood, plastic molding, display, etc., preventing scattering, cosmetics, It is used in applications aimed at surface protection such as rust prevention. However, the plastic film as exemplified has a drawback that the surface is easily damaged by contact and friction with other hard objects because the surface hardness is low and the wear resistance is insufficient.

  As coating agents for protecting the surface, organic coating agents such as acrylic urethane and inorganic coating agents such as organosilane are known. The former urethane-based coating agent has high chemical resistance and stain resistance, but has a drawback that physical strength such as weather resistance, abrasion resistance, and scratch resistance is insufficient. In order to improve this defect, a coating agent obtained by modifying an acrylic resin with silicone is known, but the weather resistance is slightly improved, but sufficient performance such as hardness is not obtained. On the other hand, the latter inorganic coating agent is composed of an alkoxylane hydrolyzate and the like, and has an advantage that it has excellent weather resistance and can form a high hardness film. However, since a high temperature and time are required for curing, and a large curing shrinkage is involved in the formation of the film, cracks are likely to occur. Moreover, since there is not enough flexibility in a film, there exists a problem that an application range is limited when using as a protective film. Further, such a silane-based film has a drawback of low alkali resistance.

In order to increase the hardness of the hard coat layer, it is effective to make the thickness of the hard coat layer thicker than the usual 3 to 25 μm. However, there is a problem that the haze increases by increasing the thickness, the brittleness of the hard coat layer deteriorates and cracks and peeling easily occur, and at the same time, curling of the hard coat film due to curing shrinkage increases. As another method for increasing the hardness of the hard coat layer, the resin-forming component of the hard coat layer is a polyfunctional acrylate monomer, and this is a powdered inorganic filler such as alumina, silica, titanium oxide, and polymerization initiation. A coating composition containing an agent is disclosed in Patent Document 1. In recent years, filling with crosslinked organic fine particles has also been studied. These have the effect of increasing the surface hardness of the hard coat layer, but also have problems such as increased haze, brittle deterioration, composition instability, precipitation of precipitates, etc. The performance could not be sufficiently satisfied (see Patent Documents 1 to 4). In order to solve this problem, it has been attempted to add colloidal silica to the composition for forming a hard coat layer, thereby increasing the hardness while suppressing the film thickness and the degree of crosslinking (Patent Document 5). In the composition for forming a hard coat layer, there are problems that silica particles are contained and there is no alkali resistance, and there is a possibility that the silica particles are dissolved when saponified. On the other hand, a photocuring initiator that reacts with the wavelength characteristics of the ultraviolet light source is selected and used, and a plurality of photocuring initiators having different peaks in the absorption wavelength region are mixed for each of the plurality of coating layers of the ultraviolet curable resin composition. In order to cure the layer-formed UV curable resin composition coating film, the peak of the absorption wavelength region of the photocuring initiator added to the lower layer coating is the start of photocuring added to the upper layer coating film. Although there is a method (Patent Document 6) in which the wavelength characteristic of the ultraviolet light source is efficiently utilized when the wavelength is longer than the peak of the absorption wavelength region of the agent (Patent Document 6), a plurality of coatings are required to form a plurality of hard coat layers. Work and exposure are required. For this reason, the production efficiency is poor and the cost increases.
Japanese Patent Publication No. 2-60696 JP 2001-113649 A JP 2002-67238 A JP 2002-69333 A JP 2005-162836 A JP-A-11-333370

  Therefore, the present invention solves the problems of the prior art, and uses a hard coat layer forming composition having high transmittance, high hardness, high stability, and alkali resistance without causing curling and cracking. It is an object of the present invention to provide a laminated body and a method for producing the same.

請 Motomeko invention described in 1 is a method of manufacturing a laminate having at least a hard coat layer on the substrate, a hard coat layer forming composition below was coated onto the substrate, the coating composition Is a method for producing a laminate, which comprises a step of sequentially irradiating with a long wavelength light in a range of 380 nm to 600 nm and subsequently irradiating with a short wavelength light of 200 nm to less than 380 nm.
The hard coat layer forming composition:
Hard coat layer comprising, in the molecule, a radical curable compound (1) having two or more carbon-carbon double bonds, a radical polymerization initiator (2) sensitive to energy rays, and a solvent (3) In the forming composition:
The radical curable compound (1) is one or more compounds selected from the group consisting of acrylic esters, acrylamides, methacrylic esters, methacrylamides and urethane acrylates,
The composition ratio of the radical polymerization initiator (2) is 0.1 to 10% by weight with respect to the total radical polymerizable compound contained in the composition,
As the radical polymerization initiator (2), at least two kinds of radical polymerization initiators having an absorption wavelength of 200 nm or more and less than 380 nm and a radical polymerization initiator having an absorption wavelength of 380 nm or more and 600 nm or less are used. And
The composition for forming a hard coat layer, wherein the composition ratio of the solvent (3) is 10 to 90% by mass with respect to the entire composition.

The composition for forming a hard coat layer of the present invention can easily and efficiently form a thin film having high hardness by coating, and the obtained thin film has a high transparency of a transmittance of 92% or more. In the laminate of the present invention, the composition for forming a hard coat layer of the present invention is coated on a substrate, and the coated material is irradiated with long-wavelength light in the range of 380 nm to 600 nm, and then 200 nm to less than 380 nm. Can be manufactured by a method of sequentially irradiating the short wavelength light, and is simpler than the technique described in Patent Document 6 and is easily put into practical use. In addition, the composition for forming a hard coat layer of the present invention is characterized in that no precipitate is deposited even when left for a long time (two months or more). That is, the composition for forming a hard coat layer of the present invention has high stability. Furthermore, the hard coat layer obtained by the present invention is excellent in chemical resistance typified by alkali resistance, and it is very convenient to form a functional layer on the hard coat layer.
According to the present invention, a composition for forming a hard coat layer having high transmittance, high hardness, high stability, and alkali resistance without curling and cracking, a laminate using the same, and a method for producing the same are provided. Is done.

Hereinafter, the present invention will be described in detail.
Examples of the radical curable compound (1) used in the present invention include compounds having two or more carbon-carbon double bonds in the molecule and cured by ionizing radiation or ultraviolet irradiation.
Specifically, acrylic resins such as acrylic acid esters, acrylamides, methacrylic acid esters, methacrylamides, and urethane acrylates that are ultraviolet curable are suitable. Although the above resin is mentioned, it is not this limitation.

  The radical polymerization initiator (2) of the present invention is not particularly limited as long as it is a compound that has sensitivity to energy rays and can initiate radical polymerization by irradiation with energy rays. For example, acetophenone compounds, benzophenone compounds, and benzyl compounds can be suitably used. Although the above polymerization initiator is mentioned, it is not this limitation.

These energy ray-sensitive radical polymerization initiators (2) are preferably used by blending two or more of them according to the desired performance. That is, as the radical polymerization initiator (2), at least two kinds of radical polymerization initiators having an absorption wavelength of 200 nm or more and less than 380 nm and an absorption wavelength of 380 nm or more and 600 nm or less of a long wavelength are used. use. For example, as a commercially available photocuring initiator having an absorption wavelength range of short wavelength 200 nm or more and less than 380 nm, Irgacure 184 (or Irgacure 500) (manufactured by Ciba, 1-hydroxy cyclohexyl phenyl ketone), Irgacure 651 (manufactured by Ciba, 2,2-dimethoxy-1,2-diphenylethane-1-one), Irgacure 250 (Ciba), Irgacure EDB (Ciba), Irgacure EHA (Ciba), Sarcure SR1120 (Sartomer), Sarcure SR1121 (manufactured by Sartomer), Sarcure SR1122 (manufactured by Sartomer), Sarcure SR1125 (manufactured by Sartomer) and the like are exemplified, but not limited thereto. Commercially available photocuring initiators having a long wavelength absorption wavelength range of 380 nm to 600 nm include Irgacure 369 (manufactured by Ciba), Irgacure 907 (manufactured by Ciba), Irgacure 819 (manufactured by Ciba), and Irgacure 1800 (manufactured by Ciba). ), DAROCUR TPO (manufactured by Ciba, 2,4,6-trimethylbenzoyldiphenylphosphine oxide), and the like.
Further, the amount of the radical polymerization initiator (2) to be added is a radical polymerizable compound other than the radical polymerizable compound (1) with respect to the radical polymerizable compound (1) or in the hard coat layer forming composition. When it contains, it is preferable that it is 0.1 to 10% (wt%) with respect to all the radically polymerizable resin in the composition for hard-coat layer formation including this. If it exceeds this range, a hard coat layer having a sufficient strength is difficult to obtain, whereas if it is below this range, curing may be insufficient.

  The use ratio of the radical polymerization initiator having an absorption wavelength of 200 nm or more and less than 380 nm and the radical polymerization initiator having an absorption wavelength of 380 nm or more and 600 nm or less is the former: latter (weight ratio): 9 .5: 0.5 to 3.5: 6.5.

  Examples of the solvent (3) used in the present invention include aliphatic hydrocarbons such as hexane, heptane and cyclohexane, aromatic hydrocarbons such as toluene and xylene, halogenated hydrocarbons such as methylene chloride and ethylene chloride, methanol, ethanol, Alcohols such as propanol, butanol and 1-methoxy-2-propanol, ketones such as acetone, methyl ethyl ketone, 2-pentanone, isophorone and cyclohexanone, esters such as methyl acetate, ethyl acetate and butyl acetate, cellosolve solvents such as ethyl cellosolve, etc. Is used. Although the above solvent is mentioned, it is not this limitation. The concentration and viscosity of the resin composition thus prepared are not particularly limited as long as they can be coated, and can be appropriately selected according to the situation. The composition ratio of the solvent (3) is preferably 10 to 90% (wt%) with respect to the entire composition. When the composition ratio of the solvent is less than 10 wt%, the viscosity of the composition increases and it becomes difficult to form a hard coat layer having a uniform film thickness. On the other hand, when the composition ratio of the solvent exceeds 90 wt%, the drying process time for removing the solvent becomes too long, resulting in high manufacturing cost.

  The film thickness of the hard coat layer is preferably in the range of 3 to 25 μm. If the thickness of the hard coat layer to be formed is less than 3 μm, a hard coat layer having sufficient hardness cannot be obtained. When the thickness of the hard coat layer exceeds 25 μm, a hard coat layer having a sufficient code in the thickness direction can be obtained even if the photocuring initiator having a different absorption wavelength of the present invention is used. It will disappear.

Moreover, you may mix an antifouling agent in the composition for hard-coat layer formation of this invention. By using an antifouling agent, when it is provided on the front surface of the substrate to be protected as a protective material, it can be easily removed when it is protected or contaminated from dirt.
Although it does not specifically limit as an antifouling agent, The composition containing the compound etc. which contain a fluorine and silicon can be used conveniently.
In particular, an alkoxysilane compound having a perfluoro group can be used.

Moreover, you may add a functional additive in the composition for hard-coat layer formation. Examples of the functional additive include functional additives such as antiglare property, antistatic property and infrared absorption property.
In order to impart antiglare properties, for example, acrylic resin particles or silica particles having a particle size of about 0.1 to 10 μm can be used.
In order to impart antistatic properties, conductive particles such as zinc oxide particles, tin-indium composite oxide (ITO) particles, tin oxide particles, and antimony oxide particles can be used.
A well-known thing can be used for an infrared absorber.

  The laminate of the present invention can be formed by applying the above-mentioned composition for forming a hard coat layer on a substrate, and applying and curing the composition.

The substrate is preferably transparent. These include cellulose triacetate (TAC), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyamide (PA), polycarbonate (PC), polymethyl methacrylate (PMMA), nylon (Ny), polyester Examples thereof include plastic film-based substrates such as tersulfone (PES), polyvinyl chloride (PVC), and polypropylene (PP), and glass substrates.
In addition, when using it as the antireflection material used for the surface of LCD, it is preferable to use a TAC film in the point of an optical characteristic.

  The organic polymer constituting the plastic film base material can be used in the form of a known additive, for example, an ultraviolet absorber, a plasticizer, a colorant, an antioxidant, a flame retardant, a lubricant and the like. . In addition, the film-based substrate may be a single layer or a laminate of a plurality of organic polymers. The thickness is not particularly limited, but is preferably 30 to 200 μm.

In the laminate of the present invention, the composition for forming a hard coat layer of the present invention is coated on a substrate, and the coated material is irradiated with long wavelength light in a range of 380 nm to 600 nm (hereinafter referred to as long wavelength irradiation). Subsequently, irradiation with short wavelength light of 200 nm or more and less than 380 nm (hereinafter referred to as short wavelength irradiation) is performed by sequentially performing these long wavelength irradiation and short wavelength irradiation. The obtained laminate has an extremely high hardness of the hard coat layer.
The wavelength characteristics of the irradiation lamp have a large peak of radiated power in several wavelength ranges, so if the absorption wavelength range of the radical polymerization initiator matches the effective wavelength range of the radiated power of the irradiation lamp, the reaction proceeds. Cheap. Therefore, if radical polymerization initiators having different absorption wavelength ranges are used, the radiation power of the irradiation lamp can be used effectively. For this purpose, in the present invention, first, the coating material is irradiated with a long wavelength using a long wavelength lamp (380 nm to 600 nm), and a radical polymerization initiator having an absorption wavelength region of 380 nm to 600 nm is obtained. Start up and cure reaction to the deep part of the resin to harden the entire hard coat layer. Next, short wavelength irradiation is performed using a short wavelength lamp (200 nm or more and less than 380 nm), a radical polymerization initiator having an absorption wavelength region of 200 nm or more and less than 380 nm is also started, and the curing reaction is continued. As a result, the hard coat layer is completely cured. Accordingly, the hardness of the hard coat laminate is increased.

In addition, when using the laminated body of this invention as a front plate of a display, it is preferable to have a high light transmittance.
Specifically, if it is a clear hard coat layer, it is preferably in the range of haze 0.05 to 0.5 and light transmittance 85 to 95%, and it is a hard coat layer having antiglare properties as described later. If it exists, the inside of the range of haze 5%-50% and light transmittance 80%-95% is preferable.

  The laminate of the present invention has antireflection performance, antistatic performance, antifouling performance, antiglare performance, electromagnetic wave shielding performance, infrared absorption performance, ultraviolet absorption performance, color correction performance, etc. A functional layer is provided. Examples of these functional layers include an antireflection layer, an antistatic layer, an antifouling layer, an antiglare layer, an electromagnetic wave shielding layer, an infrared absorption layer, an ultraviolet absorption layer, and a color correction layer. These functional layers may be a single layer or a plurality of layers. For example, the antireflection layer may be composed of a single low refractive index layer, or may be composed of a plurality of layers by repeating a low refractive index layer and a high refractive index layer. Further, the functional layer may have a plurality of functions as a single layer, such as an antireflection layer having antifouling performance. Laminated films in which these functional layers are provided on a laminate in which a hard coat layer is formed on a transparent substrate can be bonded to various display surfaces such as liquid crystal displays, plasma displays, and CRT displays. It is possible to provide a display with excellent scratch resistance.

  Further specific examples of the antireflection layer include, for example, a single layer of a low refractive index layer having a refractive index of about 1.3 to 1.5 mainly composed of an inorganic compound such as silicon oxide and magnesium fluoride, A high refractive index layer mainly composed of titanium, zinc oxide, indium oxide or the like and having a refractive index of about 1.8 to 2.4 and the low refractive index layer alternately laminated, a low refractive index layer, a high refractive index Examples include those obtained by laminating an intermediate refractive index layer having an intermediate refractive index.

  As the antifouling layer, the antiglare layer, the electromagnetic wave shielding layer, the antistatic layer, and the infrared absorbing layer, those obtained by mixing the above-described functional additives into a resin such as an acrylic resin can be used. Also, the color correction layer can be made by mixing a color correction additive into a resin such as an acrylic resin.

  As the electromagnetic wave shielding layer, a finely patterned metal thin film layer or the like can be used.

  The laminate of the present invention thus obtained can be suitably used by being bonded to the front surface of various displays such as LCD, CRT, PDP, EL and the like.

  EXAMPLES Hereinafter, although an Example and a comparative example further demonstrate this invention, this invention is not limited to the following example.

Example 1
(Preparation of composition for forming hard coat layer)
Dipentaerythritol hexaacrylate DPHA (manufactured by Nippon Kayaku) 4.0 g and urethane acrylate UA-306H 4.0 g (manufactured by Kyoeisha Chemical Co., Ltd.) were mixed, and 0.24 g of initiator Irgacure 184 and 0.16 g of initiator DAROCUR TPO were mixed. Further, 8.0 g of a solvent methyl ethyl ketone / methyl acetate (50:50 wt%) mixed solvent was added and stirred for 1 hour to obtain a composition for forming a hard coat layer. The composition for forming a hard coat layer was stable, transparent even when left for 2 months, and no precipitate was deposited.

(Formation of hard coat layer)
3.0 ml of the resulting composition for forming a hard coat layer was dropped on the surface of a triacetyl cellulose film (TAC) substrate (manufactured by Fuji Film Co., Ltd., thickness: 80 μm), and applied using a wire bar to form a film. Long-wavelength irradiation (385 to 500 nm) was performed using a UV lamp V bulb (Fusion) with a short wavelength cut filter LU3851 (manufactured by Asahi Spectroscopic Co., Ltd.) that cuts a wavelength of 385 nm or less after drying at 50 ° C. for 1 minute. (Integrated exposure 150 mJ / cm ² ). Furthermore, short wavelength irradiation (200 to 350 nm) was also performed using a UV lamp H bulb (manufactured by Fusion) (integrated exposure 200 mJ / cm ² ). The film thickness of the obtained hard coat layer was 10 μm.

Example 2
In Example 1, the same operation as in Example 1 was performed except that UV curable resin UV-1700B manufactured by Nippon Synthetic Chemical Co., Ltd. was used instead of DPHA as the hard coat layer forming composition. A composition for forming a coat layer was obtained. The composition for forming a hard coat layer was stable, transparent even when left for 2 months, and no precipitate was deposited.
Thereafter, a hard coat layer was formed on the surface of the TAC substrate by the same operation as in Example 1. The film thickness of the obtained hard coat layer was 10 μm.

Comparative Example 1
In Example 1, 3.0 ml of the hard coat layer forming composition was dropped on the surface of the TAC substrate and applied using a wire bar. It dried for 1 minute at 50 degreeC, and hardened | cured by short wavelength irradiation (exposure amount 350mJ / cm < ² >). The film thickness of the obtained hard coat layer was 10 μm.

Comparative Example 2
In Example 1, 4.0 g of DPHA (manufactured by Nippon Kayaku) and 4.0 g of UA-306H (manufactured by Kyoeisha Chemical) were mixed, 0.4 g of initiator Irgacure 184 was further added, and the solvent methyl ethyl ketone / methyl acetate (50 Was mixed with 8.0 g of a mixed solvent and stirred for 1 hour to obtain a composition for forming a hard coat layer. 3.0 ml of the composition was dropped on the surface of the TAC substrate and applied using a wire bar. The film was dried at 50 ° C. for 1 minute and irradiated with a long wavelength (integrated exposure 150 mJ / cm ² ). Furthermore, short wavelength irradiation was also performed (integrated exposure dose 200 mJ / cm ² ). The film thickness of the obtained hard coat layer was 10 μm.

Comparative Example 3
In Example 2, 3.0 ml of the hard coat layer forming composition was dropped on the surface of the TAC substrate and applied using a wire bar. It dried for 1 minute at 50 degreeC, and hardened | cured by short wavelength irradiation (exposure amount 350mJ / cm < ² >). The film thickness of the obtained hard coat layer was 10 μm.

Comparative Example 4
In Example 2, 0.40 g of initiator Irgacure 184 was added using UV curable resin UV-1700B manufactured by Nippon Synthetic Chemical Co., Ltd. as a hard coat layer forming composition. A solvent methyl ethyl ketone / methyl acetate (50:50 wt%) mixed with 8.0 g of a mixed solvent and stirred for 1 hour to obtain a composition for forming a hard coat layer. 3.0 ml was dropped on the surface of the TAC substrate and applied using a wire bar. The film was dried at 50 ° C. for 1 minute and irradiated with a long wavelength (integrated exposure 150 mJ / cm ² ). Furthermore, short wavelength irradiation was also performed (integrated exposure dose 200 mJ / cm ² ). The film thickness of the obtained hard coat layer was 10 μm.

Evaluation The hard coat layers obtained in Examples 1 and 2 and Comparative Examples 1, 2, 3, and 4 were evaluated for pencil hardness, haze, total light transmittance, and initial adhesion test, and are shown in Table 1.
(Pencil hardness evaluation method)
A pencil scratch test specified in JISK5400 was performed. The pencil scratch test result (X / 5) indicates that X is the number of times the scratch was not scratched among the five tests. X is passed when it becomes 4 or more.
(Haze, total light transmittance evaluation method)
The measurement was performed using an NDH 2000 haze meter manufactured by Nippon DENSHOKU.
(Evaluation method for initial adhesion test)
On the surface of the coating layer on the substrate, 100 squares of 1 mm square are formed with a knife (length 10 x width 10), and cellophane adhesive tape (Nichiban Co., Ltd. industrial 24 mm width cello tape (registered trademark)) is formed. The film was strongly attached and peeled rapidly in the 90 ° direction, and the number of coating layer peelings was examined. The results are shown in Table 1.

  The pencil hardness of the hard coat layer obtained from Example 1 was 4H (4/5, 5/5, 5/5). The pencil hardness 4H (3/5, 3/5, 3/5) of Comparative Example 1 is higher than the pencil hardness 4H (2/5, 3/5, 2/5) of Comparative Example 2. According to the present invention, production of a hard coat layer which is a high hardness thin film has been realized. And haze is 0.19% and total light transmittance is 92.01%. The coated film showed high transparency. No interference fringes were visible. Furthermore, the initial adhesion test result was 100/100, indicating that the adhesion was good. When the radical polymerizable compound of Example 1 is polymerized, long-wavelength irradiation (380 nm to 600 nm) can be performed so that light in a long wavelength region can act on the deep part of the hard coat layer, thereby achieving deep curing. It was done. Furthermore, when short wavelength irradiation (200 nm or more and less than 380 nm) was irradiated, UV in the short wavelength region acted on the surface of the hard coat layer, and the surface hardness of the hard coat layer increased. For this reason, the hardness of the hard coat layer was entirely improved. On the other hand, since the comparative example 1 is only short wavelength irradiation, the effect | action to a hard-coat layer deep part is difficult. That is, the hard coat layer deep portion is not sufficiently cured. In the case of Comparative Example 2, there is no radical polymerization initiator having an absorption wavelength of 380 nm or more and 600 nm or less in the composition for forming a hard coat layer even when long wavelength irradiation and short wavelength irradiation are performed. Is difficult to use. It is difficult to improve the hardness of the hard coat layer.

  The pencil hardness of the hard coat layer obtained from Example 2 was 4H (5/5, 5/5, 5/5). The pencil hardness 4H (3/5, 3/5, 4/5) of Comparative Example 3 is higher than the pencil hardness 4H (3/5, 3/5, 2/5) of Comparative Example 4. According to the present invention, production of a hard coat layer which is a high hardness thin film has been realized. And haze is 0.17% and total light transmittance is 92.11%. The coated film showed high transparency. No interference fringes were visible. Furthermore, the initial adhesion test result was 100/100, indicating that the adhesion was good. When the radically polymerizable compound of Example 2 is polymerized, long-wavelength irradiation (380 nm to 600 nm) can be performed so that light in a long wavelength region can act on the deep part of the hard coat layer, thereby achieving deep curing. It was done. Furthermore, when short wavelength irradiation (200 nm or more and less than 380 nm) was irradiated, UV in the short wavelength region acted on the surface of the hard coat layer, and the surface hardness of the hard coat layer increased. For this reason, the hardness of the hard coat layer was entirely improved. On the other hand, since the comparative example 3 is only short wavelength irradiation, the effect | action to the hard-coat layer deep part is difficult. That is, the hard coat layer deep portion is not sufficiently cured. In the case of Comparative Example 4, there is no radical polymerization initiator having an absorption wavelength of 380 nm or more and 600 nm or less in the composition for forming a hard coat layer even when long wavelength irradiation and short wavelength irradiation are performed. Is difficult to use. It is difficult to improve the hardness of the hard coat layer.

  The composition for forming a hard coat layer of the present invention and a laminate using the composition have high transmittance, high hardness, high stability and alkali resistance without curling or cracking. The production method of the present invention makes it possible to produce the laminate easily and at low cost. The composition for forming a hard coat layer of the present invention and a laminate using the composition are effectively used for various display surfaces such as liquid crystal displays, plasma displays, and CRT displays.

Claims (1)

A method for producing a laminate having at least a hard coat layer on a substrate, wherein the following composition for forming a hard coat layer is applied on the substrate, and the applied product has a long wavelength in the range of 380 nm to 600 nm. A method for producing a laminate, comprising a step of irradiating light, and subsequently sequentially irradiating light having a short wavelength of 200 nm or more and less than 380 nm.
The hard coat layer forming composition:
Hard coat layer comprising, in the molecule, a radical curable compound (1) having two or more carbon-carbon double bonds, a radical polymerization initiator (2) sensitive to energy rays, and a solvent (3) In the forming composition:
The radical curable compound (1) is one or more compounds selected from the group consisting of acrylic esters, acrylamides, methacrylic esters, methacrylamides and urethane acrylates,
The composition ratio of the radical polymerization initiator (2) is 0.1 to 10% by weight with respect to the total radical polymerizable compound contained in the composition,
As the radical polymerization initiator (2), at least two kinds of radical polymerization initiators having an absorption wavelength of 200 nm or more and less than 380 nm and a radical polymerization initiator having an absorption wavelength of 380 nm or more and 600 nm or less are used. And
The composition for forming a hard coat layer, wherein the composition ratio of the solvent (3) is 10 to 90% by mass with respect to the entire composition.