JPH01302201A - Resin composition for molding lens sheet - Google Patents

Abstract

PURPOSE:To obtain the lens sheet having excellent optical characteristics and mechanical characteristics by specifying the compsn. of a resin for molding the lens sheet. CONSTITUTION:The resin compsn. prepd. by adding a slight amt. of a surfactant or release agent and antistatic agent to 20-70wt.% oligomer, 80-30wt.% mono mer and 0.1-5.0wt.% photoreaction initiator is used as the resin compsn. for forming the Fresnel lens sheet, lenticular lens sheet, etc. by curing thereof by ionization radiation. The lens sheet having the excellent optical characteristics such as transparency and ray transmittance and the excellent mechanical characteristics such as surface hardness, wear resistance, light resistance, and shape stability is obtd. in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a resin composition for molding a lens sheet, and more specifically to a Fresnel lens sheet and a prism lens sheet used in a transmission type screen.

The present invention relates to a resin composition for molding a lens sheet, which is suitable for molding a lens sheet such as a lenticular lens sheet by irradiating it with ionizing radiation and curing it.

[Conventional technology]

Conventionally, this type of lens sheet has been molded by a pressing method, a casting method, or the like. The former press method has poor productivity because it involves a heating, pressurizing, and cooling cycle. In addition, the latter casting method involves pouring monomer into a mold and polymerizing it, which is time-consuming.
Since a large number of molds are required, there is a problem in that the manufacturing cost increases.

In order to solve this problem, an ionizing radiation curing resin such as an ultraviolet curable resin or an electron beam curing resin is poured between the mold and the base plate, and ionizing radiation such as ultraviolet rays or an electron beam is irradiated. Various ionizing radiation curing resin methods (photopolymer methods) have been proposed in which the resin is cured and polymerized.

For example, in JP-A No. 62-33613 ``Method for manufacturing a screen for a video projector,'' ``a UV-curable resin is injected into a lens mold under normal pressure and covered with a UV-transparent plate. A proposal has been made which aims to cure the UV-curable resin by irradiating the UV-curable resin filled between the mold and the UV-curable resin through the UV-transparent plate, and then release the cured UV-curable resin from the mold. ing.

(Problems to be Solved by the Invention) The method proposed above has the following problems to be solved.

First, as a means of laminating an ultraviolet i3-transparent substrate on the ultraviolet curable resin injected into the mold, we used vacuum tweezers to laminate the ultraviolet i3-transparent substrate onto the ultraviolet curable resin injected into the mold. It is proposed that one side should be in contact with the other side, and the other side should be gradually covered with ultraviolet curable resin to avoid entraining air bubbles. control device,
The drive unit? j! In addition to increasing costs, it was impossible to completely cover the air bubbles so as not to contain any air bubbles.

Second, when bubbles are mixed into the resin during injection, it is proposed to remove them using a pipette, etc., but detecting the presence of bubbles and removing them manually is not productive. Bad and uncertain.

Thirdly, the resin must be defoamed before injection, which requires equipment and time, leading to poor productivity and increased costs.

If such bubbles remain in the lens part, partial defects will occur.
Lens quality will deteriorate.

The applicant has proposed that ``After forming a resin pool of ionizing radiation, a base member is placed and layered while being leveled with a pressure roller, and the resin is cured by ionizing radiation to manufacture a plastic lens sheet. ” method has already been proposed.

There are a wide variety of ionizing radiation-curable resins used when manufacturing lens sheets using the above method, and they must be used appropriately depending on the purpose of use.Ionizing radiation-curable resins can be broadly classified into There are liquids called reactive oligomers that are jelly-like, pudding-like, or highly viscous at room temperature, and liquids that have relatively low viscosity at room temperature called photoreactive monomers. Furthermore, there are photoreaction initiators that initiate and promote photoreactions, and polymerization inhibitors that suppress photoreactions, which can be added as necessary. Furthermore, it is also possible to add a small amount of additives to modify the resin.

However, when manufacturing a lens sheet by the method proposed by the applicant mentioned above, the following is required for the ionizing radiation-curable resin.

First, when used as a lens sheet, it basically has good transparency, high light transmittance, surface hardness,
Abrasion resistance 5 Light resistance, ring resistance, heat resistance.

Shape stability etc. are required.

In addition, in order to pour the resin into the mold, it must have good fluidity, low foaming, foam control, and high wettability, as well as safety and low toxicity. Not even.

In particular, in the case of Fresnel lens sheets, since the lens shape has sharp parts, the resin is required to have not only hardness but also flexibility in order to satisfy wear resistance.

An object of the present invention is to meet all the requirements of the above-mentioned 1 as a radiation-curing resin when carrying out the method of manufacturing a lens sheet proposed by the present applicant which solves the problems of the prior art. An object of the present invention is to provide a resin composition for molding a lens sheet that can be suitably used.

[Means to solve the problem]

First, the method for manufacturing a lens sheet proposed by the applicant will be briefly explained, and then the resin composition for molding a lens sheet according to the present invention will be explained in detail.

That is, the method for manufacturing the lens sheet includes a resin coating step, a leveling and laminating step, a resin curing step, and a mold release step.

The resin application process is a process of applying 1i radiation-curable resin onto the mold in which the lens pattern mold is formed. Methods for applying the ionizing radiation-curable resin include squeeze method, flow coating method, and roll coating method. , quantitative separation method, etc. can be used.

In the leveling and laminating process, 1
) This is a step of stacking base members transparent to dispersing radiation and leveling the ionizing radiation-cured resin using a pressure roll.

This process works to push out air bubbles that may have entered between the mold and the base member, and to make the thickness of the molded product uniform.

The base member used here may be one that is transparent to ionizing radiation, and may be a thick plastic plate or a relatively thin film. Moreover, if it is thick, it may be a flat plate or may be curved. Furthermore, this base member may be peeled off at the end. This base member is coated with a vinyl chloride/vinyl acetate copolymer or urethane primer to improve adhesion.
If it is to be peeled off later, it is preferable to apply a release agent.

The resin curing step is a step of irradiating the ionizing radiation-cured resin with ionizing radiation and curing it. In this step, the ionizing radiation curing resin is cured by irradiating it with '':4 dispersion radiation such as ultraviolet rays or electron beams. At this time, it is preferable to bring the light source as close as possible to the roll pressurizing part.
This is to prevent floating between the mold and the base member and to prevent air bubbles from being mixed in between them.

The mold release step is a step of releasing the ionizing radiation-cured resin from the mold.

In addition, as another method, the first resin coating step and the second resin coating step are performed.
The resin coating process, the leveling and laminating process, the resin curing process,
It may also consist of a mold release step.

Here, the added first resin coating step is a step of coating the entire surface of the mold in which the lens pattern mold is formed with the first IT ionizing radiation curing resin. This step is a step to improve wettability to the mold and to facilitate defoaming in the next step.

Specifically, it can be carried out by a roll coating method, a silk screen method, a curtain method, a gravure method, a squeezing method, etc., and each subsequent step can be carried out in substantially the same manner as each step described above.

In order to meet all the requirements for a resin composition used in such a method for manufacturing a lens sheet, the resin composition for molding a lens sheet according to the present invention contains 20 to 70% oligomer and 80 to 30% oligomer. world% monomer and 0.1~
5.0% by weight of a photoreaction initiator.

The oligomer has excellent various properties mentioned above,
Urethane-based, polyester-based, and epoxy-based materials are required, and in the case of urethane-based oligomers, Goselac UV70 is required.
00B, Go Serac UV4200T, Go (! Rack UV3000B.

Goselac UV200OB (Japanese synthetic type), Diamond Beam UK6034. Diabeam UK6039 (manufactured by Mitsubishi Rayon), Art Resin UNII00T (Nemoto Kogyo type), Kayalad UX70506 (Nippon Kaso), etc. can be used. In the case of polyester oligomers, Kayaland DPCA30°, Kayaland DPCA60. Kayarad R-604 (Japanese bodywork), Aronix M7700
．． Aloni, Kusu M8030 (Toagosei type), etc. can be used, and in the case of epoxy oligomers, Lipoxy 5P15
54, Lipoxy 5P5003 (Showa Polymer Type), U
V531. UV521 (manufactured by Moryo Ink) etc. can be used.

The monomer is required to be compatible with the oligomer, and to improve the reactivity and fluidity of the resin composition without impairing the characteristics of the oligomer. M150. Aronix M
5700. Aronix Mllll (Toagosei type), Kayarad HX220, Kayarad HX620. Kayarad TMPTA, Kayarad TCIIO3, Kayarad HD
DA, Kayarad MANDA (Nippon Kasoso), Photomer 4061SN, Photomer 4127SN (manufactured by San Nobuco), NK Ester AMP-60G.

NK Ester A-BPE-4, NK Ester IG.

2G, 3G, 4G (manufactured by Shin-Nakamura Chemical Industries), etc. can be used.

The photoreaction initiator is for initiating or accelerating the reaction between the oligomer, the monomer, and the oligomer and the monomer, and specifically, the photoreaction initiator is used to initiate or accelerate the reaction between the oligomer, the monomer, and the oligomer and the monomer. Darokyua 1) 16. Darocure 9
53 (Merck), Bycure 55 (Stauf f.
er), Irgacure 184. Irgacure 500.
Irgacure 651 (manufactured by Ciba Geigy) or the like can be used.

Moreover, as another configuration, @ amount of a surfactant and/or a mold release agent can be added to the resin composition for molding a lens sheet.

The reason for adding the surfactant is to further enhance the fluidity of the resin composition, and to reduce foaming and foaming properties.

The purpose is to provide high wettability and further improve productivity. Specifically, Florard FC-430, Florard FC-431 (manufactured by 3M in the United States), Modaflow (manufactured by Monsanto), Days Baron #1970, Disparon L
-1980, L-1982, L-1983, L-198
4, L-1985° #1920. #1925 (manufactured by Hashimoto Kasei), F3°F2O, F1a (manufactured by Henkel), etc. can be used.

The reason for adding the mold release agent is to facilitate demolding from the mold and reduce residual stress during demolding,
This is because it is necessary to improve the adhesion with the mold. As the mold release agent, higher fatty acids such as stearic acid and their metal salts, silicone oil, and other mold release agents can be used. Specifically, Gafac RE470
．． Gafack RL270. Gafac RD570 (Toho Chemical System), Blysurf 217E, Plysurf A-2
083 (manufactured by Dai-Kogyo Seiyaku), lecithin (manufactured by Ajinomoto), Mold Vits F-57, Mold Vits INT-1
) A, Mold Vuit INT-EQ-6, King Rudvinz INT-21G (manufactured by Axel), Zerec UN,
Zere, Ri NE.

Zerec NK (manufactured by DuPont) or the like can be used. The mixing ratio can be suitably carried out in the range of 0.1% by weight to 0.3% by weight.

Furthermore, as another configuration, a trace amount of an antistatic agent can be added to each of the resin compositions for molding lens sheets.

The reason for adding an antistatic agent is to prevent surrounding dust from adhering to the molded lens sheet due to static electricity. Conventionally, antistatic agents are applied after molding, which reduces productivity. Since it was bad, it was decided to add it in advance during molding.

As the antistatic agent, anionic antistatic agents, cationic antistatic agents, amphoteric antistatic agents, nonionic antistatic agents, etc. can be used, and specifically, Niregan R-1) 5, Niregan S-700 , New Elegan A, New Elegan A
SK (NOF Corporation), Armosta Atto 51). Armostat 513 (manufactured by Lion Akzo), Siastat LS, Siastat SN, Siastat SP,
Cyastat 609 (Japan Cyanamid!!8), Chemistat 7005. Chemistat 2009-A, Stakeside (manufactured by Sanyo Kasei), etc. can be used.The mixing ratio should preferably be in the range of 1% to 3% by weight. Among the above-mentioned surfactants, those having an antistatic effect can be used.

Note that this resin composition for molding a lens sheet may contain a diffusing agent. A diffusing agent can improve coating suitability, reduce polymerization shrinkage, and can further impart diffusibility. As the diffusing agent, glass, silica, alumina, insoluble plastic, talc, etc. can be used.

Next, as a more preferable composition of the resin composition for a lens sheet according to the present invention, a urethane-based acrylate resin based on IPDI (isophorone diisocyanate) is used as an oligomer, and a urethane-based acrylate resin that is compatible with the above-mentioned urethane-based acrylate resin is used as a monomer. A case will be described in which a resin having two or more reactive groups capable of dissolving and diluting the acrylate resin is used.

In order to satisfy the various performances required for plastic lens sheets as mentioned above, the more basic performance is ionizing radiation curing, which provides a tough cured product that is colorless and transparent and has abrasion resistance. Must be resin. As a material having these physical properties, urethane-based acrylate resin can be more preferably used from the viewpoint of its surface strength and toughness. In particular, resins for Fresnel lens sheets are required to have flexibility as well as hardness, and urethane-based acrylate resins fully satisfy these characteristics. Urethane acrylate resins include those based on TDI and those based on IPDI, and those based on IPDI are suitable because they are colorless and transparent.

This IPDI-based urethane acrylate resin (oligomer) is jelly-like, pudding-like, or highly viscous at room temperature, and has poor fluidity and cannot be easily poured into a mold during manufacturing, so it cannot be used alone. is not desirable.

Therefore, it is necessary to improve the fluidity of the urethane-based acrylate resin without degrading its properties. As the diluent, a solvent, a monomer, etc. can be considered, but if a solvent is used, fluidity will be improved, but the characteristics of the urethane-based acrylate resin will be diminished, so a monomer is used as a diluent.

In the present invention, the 7mer having one, two, or more reactive groups can be used; however, if one having only one reactive group is used, dilutability is better;
Although fluidity can be improved, the abrasion resistance of the cured product decreases, making it difficult to obtain a plastic lens sheet with desirable physical properties. On the other hand, when a monomer having two or more reactive groups is used, the fluidity of the resin composition is increased without impairing the properties of the urethane-based acrylate resin, and it becomes possible to easily pour it into a mold during production.

As explained above, an IPDI-based urethane acrylate resin, a monomer having two or more reactive groups capable of dissolving and diluting the urethane acrylate resin, a reaction initiator, and a fluorine-based surfactant are added. The resulting composition is suitable as a resin composition for molding a plastic lens sheet.

The mixing ratio of the resin composition varies depending on the plastic lens sheet to be manufactured, its manufacturing process, etc., but in general, urethane-based acrylate resin based on IPDI is mixed with 2 parts of the resin composition.
With respect to 0 to 70% by weight, it is desirable that the 7-mer is in the range of 80 to 30% by weight. In this case, the higher the concentration of the urethane-based acrylate resin, the better the toughness, but the lower the fluidity. There is a tendency. In addition, the photoreaction initiator to be added is 0.1 to 5.0% by weight, and the fluorine-based surfactant is 0.
．． A preferred range is 1 to 5.0% by weight.

Next, when applying the lens sheet molding resin composition in two layers, the physical properties of the first resin include mold transferability,
Defoamability 5 Wettability to mold.

Emphasis is placed on surface hardening properties, and for the second resin, adhesion to the base member and fluidity are important.

Furthermore, regarding the viscosity, the first resin preferably has a low viscosity adjusted to 200 centipoise or less, and the second resin has a relatively high viscosity adjusted to 500 to 5000 centipoise. . The reason for this is that the viscosity of the first resin must be low because it is applied to the entire surface of the mold so that there are no air bubbles between it and the fine lens pattern of the mold, and the second resin is applied while leveling it. This is because the viscosity must be relatively high in order to expel air bubbles from the resin. By forming the first resin layer in this manner, the defoaming property at the mold interface is further improved.

In this way, by using two layers of resin, each part of the mold, the base member, or the molded lens sheet itself can more effectively fulfill its respective functions, and these functions can be divided into two layers. This allows for a wider range of resin selection.

The selection conditions for the first and second resins will be further explained below. In the case of a lens sheet, it is required that the refractive indexes of both sheets are at least approximately equal. This is because the interface where the first resin and the second resin are laminated is not necessarily flat, so if the refractive index of the two resins is significantly different, it will not be possible to obtain uniform light. .

As long as this relationship is satisfied, the first resin and the second resin may be made of the same material or different materials, and in the case of different resins, they have approximately the same refractive index. It is sufficient to use a combination of materials in consideration of their physical properties, or by changing the resin temperature during the processing process of the first resin and second resin, or by adding additives (antifoaming agents, leveling agents, etc.), solvents, etc. Alternatively, by changing the compounding ratio of oligomers, monomers, etc. of the first resin and the second resin, wettability to the mold, 2N dynamicity, viscosity, etc. may be appropriately adjusted, or a solvent may be used. In the case of adjusting the coating composition by using a coating method, it is desirable to volatilize the solvent after coating and before curing in order to prevent resin shrinkage, solvent deterioration, etc.

Furthermore, a diffusing agent can be included in both or one of the first resin and the second resin.

In addition, in the present invention, a Fresnel lens, a prism lens,
Although the explanation has been made as an electromagnetic radiation-cured resin for molding lens sheets such as lenticular lenses, this resin can also be suitably used for manufacturing items having fine patterns on the surface, such as optical cards, optical disks, holograms, etc.

〔Example〕

Hereinafter, the present invention will be explained in more detail with reference to Examples.

Implementation ■ Mix 40% by weight of IPDI-based urethane acrylate resin Gosselac UV-7000B (Japan Synthetic Type) as the soil oligomer and 60% by weight of Kayarad HX220 (Nippon Kaso), a bifunctional monomer. Furthermore, Irgakiair 18 is used as a photoinitiator.
4 (manufactured by Ciba Geigy) was added in an amount of 2% by weight.

Next, an example of manufacturing a lens sheet using the resin composition blended in this manner will be described.

First, when there is one layer of molding resin, the resin is dripped onto one end (pressure roll side) of a mold having a Fresnel lens shape with a length and width of 1 m and a pitch of 0.1 mm using a flow coating method. A resin pool of 0.3 g/cd was formed. This molding resin has a refractive index of 1.49. Viscosity 2000
Adjusted to centiboise.

After the resin reservoir was formed in this way, a 3.0 mm thick transparent acrylic plate with good UV transparency coated with a vinyl chloride/vinyl acetate copolymer primer was laminated as a base member, and the resin was pressed. Roll speed 50cm/mi
Pressure was applied by rolling at n. At this time, at the tip where the resin is leveled, air bubbles that may have entered between the mold and the heath member are pushed out.

At this time, using a UV light source from the base member side,
The molding resin was cured by irradiating it with ultraviolet light (UV) of /cm for 60 seconds. Finally, the mold was depressurized and released to obtain a Fresnel lens sheet with a thickness of 3.2 mm.

Next, when the molding resin has two layers, the molding resin is applied as the first resin to the entire surface of a mold having a Fresnel lens shape with a length of 1 m and a pitch of O.Lmm. 4
9. The viscosity was adjusted to 50 centipoise and applied to a thickness of 50 μm by squeezing. In this case, the first resin has the same composition as the second resin, and a solvent (ethyl acetate) is added thereto to reduce the viscosity and improve the wettability. Note that this solvent is volatilized before applying the second resin.

Next, a second resin was dropped onto one end (pressure roll side) of the mold by a flow coating method to form a resin pool of 0.25 g/cm. As the second resin, the above-mentioned molding resin has a refractive index of 1.49. The viscosity was adjusted to 2000 centipoise.

After the resin reservoir was formed in this way, a 3.0 mm thick transparent acrylic plate with good UV transparency coated with a vinyl chloride/vinyl acetate copolymer primer was laminated as a base member, and the resin was pressed. Roll speed 50cm/mi
I was transferred and pressurized at n. At this time, apply UV light from the base member side.
Using a light source, 160 W/cm ultraviolet (UV
) for 60 seconds to cure the first resin and the second resin. Finally, the mold was depressurized and released to obtain a Fresnel lens sheet with a thickness of 3.2 mm.

The obtained lens sheet did not contain air bubbles, was colorless and transparent, had good transmittance, and had a sharply formed tip of a Fresnel lens. Moreover, the mold release property during mold release was also good.

Next, lens sheet molding resin compositions of Examples 2 to 70 as described below were produced.

Ken Sairan 50% by weight of Goselac UV7000B (manufactured by Nippon Gosei) as an oligomer, 40% by weight of bifunctional Kayalad HX220 (Nippon Kaso) as a monomer, and 40% by weight of bifunctional NK ester A-BPE-4 (new (manufactured by Nakamura Chemical Industry)
were mixed at a ratio of 70% by weight, and 2% by weight of Bycure 55 (manufactured by Stouffer) was added as a photoreaction initiator. Further, in order to improve the anti-foaming properties, 1% by weight of Modaflow (manufactured by Monsanto) was added as a surfactant.

1jU- As an oligomer, 50% by weight of Goselac UV-7000B (manufactured by Nippon Gosei), as a monomer, 30% by weight of bifunctional group Kayarad HX220 (Nippon Kaso),
20 pieces of bifunctional Kayarad MANDA (Nippon Kasoso)
As a photoreaction initiator, Darocure 1) 73 (
Merck & Co., Ltd.) was added in an amount of 1% by weight, and a fluorine-based Florard FC-431 (manufactured by 3M, USA) was added in an amount of 0.5% by weight as a surfactant.

1 lid ■ 50% by weight of Goselac UV4200T (manufactured by Nippon Gosei) as the soil oligomer, Aronix M5 as the monomer
700 (manufactured by Toagosei) at a ratio of 50% by weight, and 1% by weight of Bycure 55 (manufactured by Stouffer) as a photoreaction initiator and 2% by weight of Modaflow (manufactured by Monsando) as a surfactant were added.

50% by weight of Goselac UV7000B (manufactured by Nippon Gohsei) as an eooligomer and Aroninx Mi as a monomer.
ll (manufactured by Toagosei Co., Ltd.) at a ratio of 50% by weight, and 20% of Darocure 1) 73 (Merck) as a photoreaction initiator and 0.5% by weight of F3 (manufactured by Henkel) as a surfactant. did.

40% by weight of Diabeam UK6034 (manufactured by Mitsubishi Rayon) as the point-based eooligomer, and Kayalad HX as the monomer.
-620 (Nippon Kasoso) is mixed at a ratio of 60% by weight,
2% by weight of Irgacure 184 (manufactured by Ciba Geigy) as a photoreaction initiator, and Florard FC- as a surfactant.
431 (manufactured by 3M, USA) was added in an amount of 0.5% by weight.

Disaster Spot 1 50% by weight of Diabeam UK6034 (manufactured by Mitsubishi Rayon) as an oligomer and NK ester A as a monomer
- BPE-4 (manufactured by Shin-Nakamura Chemical Industries) was mixed at a ratio of 70% by weight and Kayarad MANDA (Nippon Kaso) at a ratio of 40% by weight, and Darocure 1) 73 (
2% by weight of Merck products) and Modaflow (
(manufactured by Monsanto) was added in an amount of 2% by weight.

One unit: 60% by weight of UV531 (manufactured by Moroyo Ink) as the main oligomer, 40% by weight of Photomer 4127SN (manufactured by San Nobuco) as a monomer, and 2 layers of Bicure 55 (manufactured by Stouffer) as a photoreaction initiator. %, and 0.5% by weight of F3 (manufactured by Henkel) was added as a surfactant.

Disaster ■ 50% by weight of Goselac UV7000B (manufactured by Nippon Gosei) as the main oligomer, Kayalad MAND as the monomer
A (Nippon Kaso) was mixed at a ratio of 50% by weight, 1% by weight of Darocure 1) 73 (Merck) as a photoreaction initiator, and Florard FC-431 (manufactured by 3M, USA) as a surfactant. 0.5% by weight was added.

40% by weight of Goselac UV7000B (manufactured by Nippon Gohsei) as an oligomer and Kayarad HX22 as a monomer.
0 (Nippon Kaso) at a ratio of 60% by weight, 1% by weight of Darocure 1) 73 (manufactured by Merck) as a photoreaction initiator, and Florard FC-431 (manufactured by 3M, USA) as a surfactant. 0.5% by weight was added.

Regarding the resin compositions of Examples 2 to 70 above,
One-layer and two-layer lens sheets were molded in the same manner as described in Example 1.

Moreover, the same composition as each Example 1-70 was carried out in the case where no surfactant was added.

In each of the above examples, the refractive index is 1.5. Light transmittance 8
0% or more, and showed a hardness higher than that of the current acrylic Fresnel lens sheet by pressing in a pencil scratch test.

Furthermore, no air bubbles were found in the molded lens sheet.

Furthermore, the electrostatic potential on the surface of the lens sheet was reduced by about 50% in the case of the lens sheet to which the surfactant was added, compared to the case of the lens sheet without the addition of surfactant, and the adhesion of dust was also reduced.

〔Effect of the invention〕

As explained in detail above, when a lens sheet is manufactured using the resin composition for lens sheets of the present invention, it has excellent optical properties such as transparency and light transmittance, and also has excellent surface hardness, abrasion resistance, light resistance, A lens sheet with excellent mechanical properties such as ring resistance, heat resistance, and shape stability can be obtained.

Also, the fluidity when pouring the resin into the mold.

Since it has excellent low foaming properties, foam suppression properties, wettability, etc., it is easy to manufacture lens sheets by the above-mentioned method, and lens sheets manufactured by this method do not contain air bubbles.

Furthermore, when a Fresnel lens sheet is manufactured, since it has both hardness and flexibility, it is possible to mold the lens into a sharp shape.

Patent applicant: Dai Nippon Printing Co., Ltd. Representative Patent Attorney Kama 1) Hisao

Claims (3)

[Claims] (1) A resin composition for molding a lens sheet comprising 20 to 70% by weight of an oligomer, 80 to 30% by weight of a monomer, and 0.1 to 5.0% by weight of a photoreaction initiator. (2) The resin composition for molding a lens sheet according to claim (1), further comprising a trace amount of a surfactant and/or a mold release agent. (3) The resin composition for molding a lens sheet according to claims (1) and (2), characterized in that a trace amount of an antistatic agent is added.