TWI564660B - Active energy ray-curable resin composition for forming pattern on light guiding plate - Google Patents

Description

Active energy ray-curable resin composition for forming a pattern on a light guide plate

The present invention relates to an active energy ray-curable resin composition, a method for preparing the resin composition, a light guide plate comprising the resin composition, a backlight unit, and a display device. More specifically, the present invention relates to an active energy ray-curable resin composition which is used to form a pattern on a light guide plate at a lower cost than the conventional one due to curing of the resin composition. This resin composition will be applied to a film type display device. The invention also relates to a method for preparing the resin composition.

In general, thin film type display devices are thinner and lighter than other types of display devices, and have the advantages of requiring low driving voltage and low power consumption. Therefore, the market for thin film type display devices is rapidly expanding in various industrial fields.

In such a display device, the panel displaying the image is a non-light emitting component that cannot spontaneously emit light, and therefore, a separate component is required in the display device to provide light.

An optical component includes one or more lamps for emitting light (for example, a line source such as a cold cathode fluorescent lamp (CCFL) or a point source such as a light emitting diode (LED)) and a light guide plate, wherein The light guide plate is used to guide the light emitted from the lamp and extract light in a direction toward the panel. In this case, the light emitted from the lamp is first completely reflected inside the light guide plate, and then reflected by the reflective pattern formed on the lower surface of the light guide plate and the reflective plate disposed under the light guide plate, thus facing the panel The direction is extracted.

With the recent popularity of thin film type display devices, there is a continuing need to miniaturize components mounted in display devices and to reduce production costs. With such a trend, the importance of light-emitting diodes (LEDs) as light sources is increasing, and the same trend is also applicable to light guide plates.

A light guide plate has an optical pattern on one or both surfaces thereof for converting a light source provided by the lamp into a surface light source. In order to form such an optical pattern on a light guide plate, a molding method which has been used is, for example, a spray, a screen printing using a reflective ink, and a molding method using an ultraviolet curing resin or a heat curing resin.

Among these molding methods, the spraying method is suitable for molding a complicated structure, but it has a drawback of a long molding time and a long cooling time. Although the printing method has a relatively simple process, this method is not suitable for forming a complicated optical pattern. Therefore, many attempts have been made to develop a method of forming an optical pattern of a light guide plate using a thermosetting resin or, more specifically, an active energy ray-curing resin having a relatively simple process and a short curing time. .

An active energy ray molding method is a method of utilizing a property of implanting a light guide plate and a stamper when a stamper is adhered to a large-sized light guide plate coated with an active energy ray-curable resin. The active energy ray-curable resin completely fills the voids, and then cures the resin by irradiating an active energy ray, and peels off the stamper, and the arrangement of the optical pattern engraved on the stamper is transferred to the light guide plate.

However, an acrylic resin conventionally used as a light guide plate, such as polymethyl methacrylate (PMMA), has a problem in that an active energy ray-curable resin is not easily adhered to an acrylic resin, and the acrylic resin is solid. The speed is slow. Therefore, an additional process is required before and after curing, and there is also a problem of low dimensional stability. There is therefore a need to solve the solution to these problems.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an active energy ray-curable resin composition which exhibits excellent adhesion even without applying any specific pretreatment to a substrate of a light guide plate. And optical performance, and can enhance productivity by shortening the duration of the process.

Another object of the present invention is to provide a method of producing a light guide plate which allows application of various patterns on a light guide plate to obtain excellent brightness performance by applying the active energy ray-curable resin composition as described above.

Another object of the present invention is to provide a backlight unit comprising the light guide plate as described above.

Moreover, another object of the present invention is to provide a display device comprising the backlight unit as described above.

In order to attain the object of the present invention as described above, there is provided an active energy ray-curable resin composition for forming a pattern on a light guide plate. This resin composition is applied to the surface of a substrate of a light guide plate and cured to form a pattern on the surface. The resin composition comprises: 100 parts by weight of one of the first active energy ray-curable monomers; 65 to 400 parts by weight of one of the active energy ray-curable oligomers; and 1 to 50 parts by weight of one of the photopolymerization starts Agent, The substrate of the light guide plate has a solubility of 0.1 to 70 in the first active energy ray-curable monomer at 30 ° C.

The active energy ray-curable resin composition further contains 40 to 120 parts by weight of fine particles per 100 parts by weight of the first active energy ray-curable monomer.

Moreover, the first active energy ray-curing monomer may be selected from the group consisting of N, N-dimethylacrylamide, benzyl acrylate, and N-vinyl-2- Pyrrolidone (N-vinyl-2-pyrrolidone).

The active energy ray-curable resin composition for forming a pattern on a light guide plate may further comprise a second active energy ray-curable monomer selected from the group consisting of 2-hydroxyethyl-acrylate (2) -hydroxyethyl acrylate), 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, benzyl methacrylate, methacrylic acid Methyl methacrylate, ethyl methacrylate, glycidyl methacrylate, isobutyl acrylate, isobutyl methacrylate, isobornyl Isobornyl acrylate, isobornyl methacrylate, N-butyl methacrylate, t-butyl methacrylate, tetrahydrofurfuryl acrylate, three Trimethylolpropane trimethacrylate, 1,6-hexanediol diacrylate, diacetate Tripropylene glycol diacrylate, trimethylolopropane triacrylate, pentaerythritol triacrylate (pentaerythritol triacrylate), and diethylene glycol dimethacrylate.

Moreover, the active energy ray-curable oligomer may be selected from the group consisting of: an urethane acrylate oligomer, an epoxy acrylate oligomer, a polyester acrylate (polyester) Acrylate) oligomer and a silicone acrylate oligomer.

The photopolymerization initiator can be selected from the group consisting of benzene ether, benzyl ketal, α-hydroxyalkylphenone, aminoalkylbenzene. A amide (aminoalhylphenone), phosphine oxide, camphorquinone, fluorinated titanocenes, and biimidazole.

The photopolymerization initiator can also be selected from the group consisting of 2,4,6-trimethylbenzoyl phosphine oxide, 1-phenyl-hydroxy- 2-methyl-2-hydroxy-2-methylpropan-1-one, phenyl and -2,4,6-trimethylbenzimidium oxide (phenylbis-2, 4,6-trimethylbenzoyl phosphine oxide) and (1-hydroxycyclohexyl)(phenylmethanone).

The average particle size of the fine particles is preferably from 1 to 5000 μm.

The fine particles may be beads such as polymethyl methacrylate acrylic beads, silica beads such as metal oxide beads of alumina, titania, zirconia or mixtures thereof.

The substrate may be selected from the group consisting of a substrate composed of polyethylene terephthalate, a substrate composed of polycarbonate, and polymethyl methacrylate. The substrate is constructed.

Moreover, the active energy ray-curable resin composition for forming a pattern on a light guide plate preferably has a viscosity of 1 to 300 cps at 20 °C.

The active energy ray-curable resin composition for forming a pattern on a light guide plate preferably has a refractive index of 1.4 to 1.6.

In another aspect, the light guide plate of the present invention has a pattern formed thereon by applying an active energy ray-curable resin composition for forming a pattern on a light guide plate to the surface of the substrate of the light guide plate and Obtained by curing this resin composition.

The substrate has a thickness of about 100 to 10000 μm and preferably 500 to 5000 μm.

In another aspect, a method for producing a light guide plate of the present invention comprises the steps of: applying an active energy ray-curable resin composition to one surface or both surfaces of a light guide plate substrate; using a transparent, elastic, soft The resin composition is molded by molding; and the resin composition is cured by irradiation with an active energy ray.

The backlight unit of the present invention comprises the light guide plate as described above.

The display device of the present invention comprises a backlight unit as described above.

A light guide plate produced by using the active energy ray resin composition of the present invention has an advantage in that various patterns can be easily formed on the light guide plate than conventional jet, silk screen, and laser methods, and the light guide plate has For example, physical and optical properties of brightness uniformity, discoloration, and yellowing resistance, which are at least equal to or superior to the corresponding characteristics of conventional light guide plates. Moreover, the active energy ray-curable resin composition has excellent adhesion to the substrate of a light guide plate, and can easily form a pattern without any special pretreatment of the light guide plate, thereby simplifying the process. In addition, since the curing speed of the resin composition is fast, the active energy ray-curable resin composition of the present invention can attain rapid productivity and reduced production cost, thereby obtaining excellent economic efficiency.

Hereinafter, preferred embodiments of the present invention will be described in detail. In the following description, many definitions and descriptions, such as specific constituent elements, are described. However, it is apparent to those skilled in the art that these definitions and descriptions are provided for illustrative purposes only and are not intended to limit the invention in any way. Further, in the following description, any function or configuration is not described in detail in the present specification if it is considered that the specific description of the known function or the composition may be unnecessarily ambiguous.

First, some terms used in this specification will be defined as follows.

The term "active energy ray" as used in this specification refers to a particle beam and an electromagnetic wave having a certain degree of energy capable of curing a predetermined resin, for example, including ultraviolet irradiation, laser, microwave, electron beam, and X-ray. .

The term "active energy ray-curing resin" refers to a resin that can be cured by an active energy ray, which acts as a layer of material that actually displays a pattern.

The term "soluble" refers to the number of grams of solute that can be dissolved by 100 grams of solvent at a given temperature.

An active energy ray-curable resin composition for forming a pattern on a light guide plate according to the present invention comprises 100 parts by weight of one of the first active energy ray-curable monomers, and 65 to 400 parts by weight of one of active energy ray-cured The oligomer and 1 to 50 parts by weight of one photopolymerization initiator, and the substrate of the light guide plate has a solubility of 0.1 to 70 in the first active energy ray-curable monomer at 30 ° C.

As described in the "Prior Art" section, in order to use an active energy ray curing method with excellent efficiency in the production of a light guide plate, an active energy ray-curable resin composition should be applied and cured on a transparent polymer substrate. However, the low adhesion of the active energy ray-curable resin composition to the above transparent polymer substrate has been regarded as a serious problem.

Accordingly, the inventors of the present invention have focused on an active energy ray-curable monomer which causes a degree of corrosion and strong adhesion on a substrate of a light guide plate. In other words, this means that the substrate of the light guide plate has a certain degree of solubility in the active energy ray-curable monomer.

The inventors conducted a large number of investigations and found that when the solubility value is 0.1 to 70 at 30 ° C, one of the active light ray-curable monomers capable of dissolving the light guide plate substrate is incorporated into the present invention in a ratio within the above range. When an active energy ray-curable resin composition of a pattern on a light guide plate is formed, the active energy ray-curable resin composition exhibits excellent adhesion without applying any specific pretreatment to the substrate.

Examples of such active energy ray-curable monomers showing such solubility include N,N-dimethylacrylamide, benzyl acrylate, and N-vinyl-2-pyrrolidone (N-vinyl- 2-pyrrolidone). Active energy ray-curable resin group for forming a pattern on a light guide plate of the present invention The active energy ray-curable monomers are contained substantially either singly or as a mixture, and in the present specification, such a basic active energy ray-curing single system is referred to as a first active energy ray-curing monomer.

The active energy ray-curable resin composition for forming a pattern on a light guide plate of the present invention may further comprise another active energy ray-curable monomer in addition to the first active energy ray-curable monomer to enhance the performance of the light guide plate.

This additional active energy ray-curing single system is referred to as a second active energy ray-curing monomer, for example, comprising 2-hydroxyethyl acrylate, 2-hydroxyethyl-methyl 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, benzyl methacrylate, methyl methacrylate, ethyl methacrylate Ethyl methacrylate), glycidyl methacrylate, isobutyl acrylate, isobutyl methacrylate, isobornyl acrylate, isobornyl methacrylate (isobornyl methacrylate), N-butyl methacrylate, t-butyl methacrylate, tetrahydrofurfuryl acrylate, trimethylolpropane trimethacrylate 1,6-hexanediol diacrylate, tripropylene glycol diacrylate Trimethylol propane triacrylate (trimethylolopropane triacrylate), pentaerythritol triacrylate (pentaerythritol triacrylate), and diethylene glycol dimethacrylate (diethylene glycol dimethacrylate). These second active energy ray curing sheets The body may be contained in the resin composition of the present invention either singly or as a mixture.

The active energy ray-curable oligomer contained in the active energy ray-curable resin composition for forming a pattern on a light guide plate of the present invention is not particularly limited as long as it is polymerizable by an active energy ray. The active energy ray-curable oligomer is preferably selected from the group consisting of a general purpose urethane acrylate oligomer, an epoxy acrylate oligomer, a polyester acrylate. A polyester acrylate oligomer and a silicone acrylate oligomer.

Further, as long as the photopolymerization initiator contained in the resin composition of the present invention can initiate photopolymerization under the action of an active energy ray, there is no particular limitation on the photopolymer. In particular, the photopolymerization initiator is preferably selected from the group consisting of benzene ether, benzyl ketal, alpha-hydroxyalkylphenone. ), aminoalkylphenone, phosphine oxide, camphorquinone, fluorinated titanocenes, and biimidazole. A specific example includes 2,4,6-trimethylbenzoyl phosphine oxide, 1-phenyl--2-hydroxy-2-methylpropan-1- Phenyl (1-phenyl-2-hydroxy-2-methylpropan-1-one), phenylbis-2,4,6-trimethylbenzoyl phosphine oxide And (1-hydroxycyclohexyl (phenylmethanone)).

The resin composition of the present invention can have a higher luminance value by further containing fine particles having an average particle size of from 1 to 5000 μm. If the average particle size of the fine particles is smaller than the above range, a large loss of luminance occurs in the process, and if the average particle size exceeds the above range, the effect of increasing the brightness is lowered. From the viewpoint of improving economic efficiency or brightness, the fine particles are preferably acrylic resin beads such as polymethyl methacrylate, silica beads such as alumina, titania, zirconia or a metal oxide bead of its mixture.

The content of the fine particles is preferably from 40 to 120 parts by weight relative to 100 parts by weight of the first active energy ray-curable monomer constituting the resin composition of the present invention. If the content of the fine particles is less than the above range, the effect of increasing the brightness is insufficient, and since the viscosity of the resin composition of the present invention is lowered, there is a disadvantage that dot bleeding occurs when the pattern is enlarged. On the other hand, when the content is more than the above range, the effect of increasing the brightness is sufficient, but the viscosity of the resin composition is excessively increased, and the workability is remarkably deteriorated.

In addition to the above-mentioned components, various additives commonly used in the related art, such as heat stabilizers, can also be incorporated into the resin composition of the present invention, in the sense that the effects of the present invention are not impaired.

The active energy ray-curable resin composition of the present invention having an organic composition of a specific composition as described above has a viscosity of 1 to 300 viscosities (cps) at 25 ° C and has a refractive index ranging from 1.4 to 1.6.

Applying the active energy ray-curable resin composition of the present invention to one surface or both surfaces of a light guide plate substrate, and then using an active energy ray when a transparent, elastic and soft stamper is used as a mold To cure the resin composition, the resin composition can be advantageously used to provide a light guide plate having various shapes. This active energy ray-curable resin composition exhibits high adhesion and excellent optical properties.

Accordingly, another object of the present invention is to provide a light guide plate comprising such an active energy ray-curable resin composition. Specifically, by applying the active energy ray-curable resin composition of the present invention to one surface or both surfaces of a substrate and curing the resin composition, a light guide plate having various patterns is provided. At this time, the light guide plate will realize all types of patterns that can be expressed by the existing pattern forming method.

Moreover, the substrate on which the active energy ray-curable resin composition of the present invention is applied and cured is preferably a transparent optical polymer substrate having excellent adhesion to the above active energy ray-curable resin composition. For example, such a substrate includes a substrate of polyethylene terephthalate, a substrate of polycarbonate, and a substrate of polymethyl methacrylate.

A substrate having a thickness of about 100 to 10000 μm and preferably 500 to 5000 μm is used.

The active energy ray for producing the light guide plate is not particularly limited as long as it can cure the resin composition of the present invention, for example, the irradiation dose of ultraviolet irradiation is 100 to 1500 mJ/cm 2 and preferably 300 mJ/cm 2 . . Conventionally used mercury lamps, gallium lamps, metal halide lamps, electrodeless lamps, and the like can be used.

The light guide plate produced as described above enables the active energy ray-curable resin composition to be directly adhered to the surface of the substrate without any pretreatment. Therefore, the production process is simple, and excellent productivity can be obtained due to the rapid curing speed of the resin composition. Moreover, when the resulting light guide plate is exposed to the backlight, the light guide plate still exhibits excellent brightness uniformity, and has excellent discoloration and yellowing resistance.

The present invention also provides a backlight unit including the above light guide plate. There is no particular limitation on this backlight unit, and it can adopt any known structure in the related art.

The present invention also provides a display device including the above backlight unit. Also, the display device is not particularly limited, and it may adopt any known structure in the related art.

Moreover, the present invention provides a method for producing a light guide plate comprising a pattern of various shapes, which is produced by applying an active energy ray-curable resin composition to one surface or both surfaces of a substrate, and then A transparent, elastic, flexible stamper (e.g., Applicant's product Regi-Flex) is used as a mold, and an active energy ray is used to cure the resin composition. In this case, when a vacuum molding method is used (see, for example, a patent of Korean Patent Application No. 10-2009-0109755), even if an optical pattern having a complicated shape is used, an area where no pattern is formed can be prevented from occurring. Or it can prevent defects such as bubbles. Moreover, a uniform optical pattern can be formed regardless of the size or thickness of the light guide plate.

Hereinafter, examples of the invention will be described.

Example

Test Example 1: Solubility test

Active energy ray-curable monomers used to increase adhesion to substrates are required to have excellent substrate corrosion resistance. Therefore, the solubility of the substrate is estimated in a representative active energy ray-curing monomer. Specifically, a polymethyl methacrylate substrate was immersed in an active energy ray-curable monomer, and then the solubility of the substrate was measured in an oven maintained at 30 °C. The test results are summarized in Table 1 below.

According to the results in Table 1, it is estimated that the polymethyl methacrylate substrate is in the curing monomer N-vinyl-2-pyrrolidone, benzyl acrylate. And high solubility in N,N-dimethylacrylamide, these curing single systems are the first active energy ray-curing monomers of the present invention. And based on these results, the resin composition of the present invention was designed as shown in the following examples.

Example 1: Active energy ray-curable resin composition (1)

Mix 35 grams of N-vinyl-2-pyrrolidone, 10 grams of N, N-dimethylacrylamide, 5 grams of trimethylolpropane triacrylate, 5 grams of benzophenone Benzyl acrylate, 10 g of urethane acrylate oligomer (Nippon Gohsei Co., Ltd.; Japan), 30 g of a urethane acrylate oligomer (Miwon Specialty Chemical Co., Ltd.; Korea), and 5 g of a photopolymerization initiator (Ciba-Geigy Japan Co., Ltd.; Japan) And stir this mixture. Thus, an active energy ray-curable resin composition having a viscosity of 50 cps at 25 ° C was prepared.

Example 2: Active energy ray-curable resin composition (2)

Mix 30 g of N-vinyl-2-pyrrolidone, 10 g of N, N-dimethylacrylamide, 20 g of a urethane acrylate oligomer ( Nippon Gohsei Corporation; Japan), 35 g of a urethane acrylate oligomer (Miwon Specialty Chemical Co., Ltd.; Korea), and 5 g of a photopolymerization initiator (Ciba-Geigy Japan Co., Ltd.; Japan), and stirring the mixture . Thus, an active energy ray-curable resin composition having a viscosity of 100 cps at 25 ° C was prepared.

Comparative Example 1: Active energy ray-curable resin composition (3)

Mix 20 g of 2-hydroxyethyl methacrylate, 10 g of 1,6-hexanediol diacrylate, 25 g of a urethane acrylate oligomer (Nippon Gohsei Co., Japan; Japan), 40 g of a urethane acrylate oligomer (Miwon Specialty) Chemical company; Korea), and 5 g of a photopolymerization initiator (Ciba-Geigy Japan Co., Ltd.; Japan), and the mixture was stirred. Thus, an active energy ray-curable resin composition having a viscosity of 200 cps at 25 ° C was prepared.

Comparative Example 2: Active energy ray-curable resin composition (4)

Mix 5 g of N-vinyl-2-pyrrolidone, 10 g of N, N-dimethylacrylamide, 30 g of agglomerate Urethane acrylate oligomer (Nippon Gohsei Co., Ltd.; Japan), 50 g of a urethane acrylate oligomer (Miwon Specialty Chemical Co., Ltd.; Korea), and 5 g of a photopolymerization initiator (Ciba-Geigy Japan Co., Ltd.) ; Japan), and stir this mixture. Thus, an active energy ray-curable resin composition having a viscosity of 250 cps at 25 ° C was prepared.

Test Example 2: Curability Estimation

Each of the active energy ray-curable resin compositions of Example 1, Example 2, Comparative Example 1, and Comparative Example 2 was added dropwise to a polymethyl methacrylate film, and then coated with a bar A bar coater is used to apply the resin composition. Next, the resin composition was irradiated with light of a metal halide lamp at a dose of 100 mJ/cm 2 , and thus the degree of curing was estimated. The estimated results are presented in Table 2 below.

Test Example 3: Color Difference and Transmittance Estimation

Each of the active energy ray-curable resin compositions of Example 1, Example 2, Comparative Example 1, and Comparative Example 2 was applied to a polymethyl methacrylate having a thickness of 3000 μm using a 150 mesh silk screen ( Polymethyl methacrylate) on the light guide plate substrate. Next, a transparent, elastic, and soft stamper was pressed on the substrate to one side of the resin composition, and then the resin composition was irradiated with light of a metal halide lamp at a dose of 300 mJ/cm 2 to cure the resin layer. Next, a spectrophotometer (CM-3600d, Konica Minolta Holdings; Japan) was used to measure the color difference (db) and the transmittance (400 nm). At this time, the light guide plate is mounted on a backlight unit, and visual inspection is performed to estimate the degree of yellowing. The estimated results are presented in Table 2 below.

Test Example 4: Turbidity Estimation

Each of the active energy ray-curable resin compositions of Example 1, Example 2, Comparative Example 1, and Comparative Example 2 was poured into a frame formed of a silicone material, and then a light of a metal halide lamp was used at a dose of 300 mJ/cm 2 . The resin composition is irradiated to cure the resin composition. The solidified product in a large state was peeled off from the box, and then visually inspected to estimate the turbidity. The estimated results are presented in Table 2 below.

Test Example 5: Adhesion Estimation

Each of the active energy ray-curable resin compositions was applied and cured in the same manner as in Test Example 3, and then the surface coated by the resin composition was divided by cutting 11 straight lines at intervals of 1 mm in the horizontal direction and the vertical direction, respectively. For 100 squares. Next, three peeling tests were carried out using an adhesive tape (Nitto Denko Co., Ltd.; Japan). This test was performed using three sets of 100 squares, and thus the average value obtained is presented in Table 2 below.

Adhesion = n/100

Where n: the number of remaining squares that have not been stripped

100: total number of squares

[ Very good, ○: good, △: slightly worse, ×: poor]

As can be seen from the results of Table 2, in Comparative Examples 1 and 2 which did not contain the first active energy ray-curing monomer of the present invention or contained a small amount of this monomer, the adhesion was very insufficient compared to Examples 1 and 2.

Example 3: Active energy ray-curable resin composition (5)

Mix 35 grams of N-vinyl-2-pyrrolidone, 15 grams of N, N-dimethylacrylamide, 10 grams of trimethylolpropane triacrylate, 10 grams of benzophenone Benzyl acrylate, 10 g of a urethane acrylate oligomer (Nippon Gohsei Co., Ltd.; Japan), 15 g of a urethane acrylate oligomer (Miwon Specialty Chemical Co.; Korea), and 5 g of a light A polystarter (Ciba-Geigy Japan Co., Ltd.; Japan) was added, and the mixture was stirred. Thus, an active energy ray-curable resin composition having a viscosity of 10 cps at 25 ° C was prepared. 10 g of silica beads (Nanospace Co.; Korea) having an average particle size of 10 μm were added to the obtained resin composition, so the viscosity was increased to 10,000 cps.

Example 4: Active energy ray-curable resin composition (6)

Mix 35 grams of N-vinyl-2-pyrrolidone, 15 grams of N, N-dimethylacrylamide, 10 grams of trimethylolpropane triacrylate, 10 grams of benzophenone Benzyl acrylate, 10 g of a urethane acrylate oligomer (Nippon Gohsei; Japan), 15 g of a urethane acrylate oligomer (Miwon Specialty Chemical Co., Ltd.; Korea), and 5 g of a photopolymerization initiator (Ciba-Geigy Japan Co., Ltd.; Japan), and the mixture was stirred. Thus, an active energy ray-curable resin composition having a viscosity of 10 cps at 25 ° C was prepared. 33 g of silica beads having an average particle size of 10 μm (Nanospace Co.; Korea), 2 g of alumina beads, and 1.6 g of aerogel (Aerogel®) (Cabot Co.; USA) were added to the obtained resin composition. Medium, so the viscosity increases to 5,000 cps.

Comparative Example 3: Active energy ray-curable resin composition (7)

Mix 35 grams of N-vinyl-2-pyrrolidone, 15 grams of N, N-dimethylacrylamide, 10 grams of trimethylolpropane triacrylate, 10 grams of benzophenone Benzyl acrylate, 10 g of a urethane acrylate oligomer (Nippon Gohsei Co., Ltd.; Japan), 15 g of a urethane acrylate oligomer (Miwon Specialty Chemical Co., Ltd.; Korea), and 5 g of one A photopolymerization initiator (Ciba-Geigy Japan Co., Ltd.; Japan), and the mixture was stirred. Thus, an active energy ray-curable resin composition having a viscosity of 10 cps at 25 ° C was prepared. 80 g of silica beads (Nanospace Co.; Korea) having an average particle size of 10 μm were added to the obtained resin composition, so the viscosity was increased to 200,000 cps.

Comparative Example 4: Active energy ray-curable resin composition (8)

Mix 35 grams of N-vinyl-2-pyrrolidone, 15 grams of N, N-dimethylacrylamide, 10 grams of trimethylolpropane triacrylate, 10 grams of benzophenone Benzyl acrylate, 10 g of a urethane acrylate oligomer (Nippon Gohsei; Japan), 15 g of a urethane acrylate oligomer (Miwon Specialty Chemical Co., Ltd.; Korea), and 5 g of a photopolymerization initiator (Ciba-Geigy Japan Co., Ltd.; Japan), and the mixture was stirred. Thus, an active energy ray-curable resin composition having a viscosity of 10 cps at 25 ° C was prepared. 20 g of silica beads (Nanospace Co.; Korea) having an average particle size of 10 μm were added to the obtained resin composition, so the viscosity was increased to 1,500 cps.

The brightness of the light guide plate obtained by Example 3, Example 4, Comparative Example 3, and Comparative Example 4 was estimated by visual inspection, and the adhesion of the light guide plate was estimated in the same manner as Test Example 5. The results are presented in Table 3 below.

[ : Very good, ○: Good, △: slightly worse, ×: poor]

As can be seen from the results of Table 3, when the active energy ray-curable resin composition of the present invention contains fine particles, the resin composition exhibits excellent brightness and adhesion even if the amount of active energy ray-curable oligomer is reduced. force. Particularly in Example 4, when different kinds of fine particles formed of silicon and alumina were used, the luminance value equivalent to that of Example 3 was obtained even with a smaller amount of fine particles. Therefore, the adjustment of the viscosity can be easily obtained by adjusting the amount of fine particles.

However, if the amount of the fine particles is too large as in Comparative Example 3, the brightness is sufficient, but the viscosity is too high, thus causing the disadvantage that the workability is deteriorated. phase On the other hand, if the amount of fine particles is too small as in Comparative Example 4, the brightness may be insufficient, and due to the low viscosity, defects of dot bleeding may occur at the time of pattern formation.

The preferred embodiments of the invention have been described above, but are not intended to limit the scope of the invention in any way. Those skilled in the art will appreciate that various deletions, substitutions, and alterations can be implemented without departing from the spirit of the invention. Therefore, the scope of the invention should not be construed as being limited to the embodiments.

Claims (11)

An active energy ray-curable resin composition for forming a pattern on a light guide plate, the resin composition being applied to a surface of a substrate of the light guide plate and cured to form a pattern, and the resin composition is The following components are composed of: 100 parts by weight of one of the first active energy ray-curable monomers; 42 to 400 parts by weight of one of the active energy ray-curable oligomers; and 1 to 50 parts by weight of one of the photopolymerization initiators The substrate of the light guide plate has a solubility in the first active energy ray-curable monomer of 0.1 to 70 at 30 ° C, wherein the first active energy ray-curable monomer comprises N-vinyl-2-pyrrolidone ( N-vinyl-2-pyrrolidone), the N-vinyl-2-pyrrolidone accounts for 58% by weight to 100% by weight of the total weight of the first active energy ray-curable monomer, and wherein the active energy ray-curable resin composition has at 25 1 to 300 cps of viscosity at ° C, and a refractive index in the range of 1.4 to 1.6. The active energy ray-curable resin composition according to claim 1, wherein the first active energy ray-curable monomer further comprises N, N-dimethylacrylamide or benzyl acrylate. Or a combination of dimethyl methacrylate and phenyl methacrylate. The active energy ray-curable resin composition according to claim 1 or 2, wherein the active energy ray-curable resin composition further contains 40 to 120 parts by weight per 100 parts by weight of the first active energy ray-curable monomer. A small number of fine particles having an average particle size of 1 to 5000 μm. The active energy ray-curable resin composition according to claim 1 or 2, wherein the active energy ray-curable resin composition further comprises a second active energy ray-curable monomer selected from the group consisting of 2-hydroxyl 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, benzyl methacrylate Benzyl methacrylate), methyl methacrylate, ethyl methacrylate, glycidyl methacrylate, isobutyl acrylate, isobutyl methacrylate (isobutyl methacrylate), isobornyl acrylate, isobornyl methacrylate, N-butyl methacrylate, t-butyl methacrylate, tetrahydrofurfuryl acrylate, trihydroxyl Trimethylolpropane trimethacrylate, 1,6-hexanediol diacrylate, dicondensation Glycol diacrylate (tripropylene glycol diacrylate), trimethylolpropane triacrylate (trimethylolpropane triacrylate), pentaerythritol triacrylate (pentaerythritol triacrylate), and diethylene glycol dimethacrylate (diethylene glycol dimethacrylate). The active energy ray-curable resin composition according to claim 1 or 2, wherein the active energy ray-curable oligomer is selected from the group consisting of: a polyurethane An urethane acrylate oligomer, an epoxy acrylate oligomer, a polyester acrylate oligomer, and a silicone acrylate oligomer. The active energy ray-curable resin composition according to claim 1 or 2, wherein the photopolymerization initiator is selected from the group consisting of benzene ether, benzyl ketal, --hydroxyalkylphenone, aminoalkylphenone, phosphine oxide, camphorquinone, fluorinated titanocenes, and biimidazole ). The active energy ray-curable resin composition according to claim 1 or 2, wherein the fine particles are selected from the group consisting of acrylic beads, silica beads, and metal oxide beads (metal oxide beads) and mixtures thereof. The active energy ray-curable resin composition according to claim 1 or 2, wherein the substrate is selected from the group consisting of a substrate composed of polyethylene terephthalate, and polycarbonate A substrate composed of a polycarbonate and a substrate composed of polymethyl methacrylate. A light guide plate comprising: a substrate, and A pattern formed by applying the active energy ray-curable resin composition as claimed in claim 1 or 2 to the surface of the substrate and curing the resin composition. A backlight unit comprising the light guide plate according to claim 9. A display device comprising the backlight unit as claimed in claim 10.