Photosensitive resin plate for polaroid attachment and use method

Abstract

The invention discloses a photosensitive resin plate for polaroid attachment, which is prepared from the following components: urethane acrylate, a vinyl unsaturated monomer, a photoinitiator and a solvent, the urethane acrylate, the vinyl unsaturated monomer and the photoinitiator are mixed to form resin, the mass ratio of the resin to the solvent is 9: 1-5: 5, the mass ratio of the polyurethane acrylate to the resin is 40%-75%, the mass ratio of the vinyl unsaturated monomer to the resin is 20%-55%, and the mass ratio of the initiator to the resin is 1%-6%. The photosensitive resin plate can effectively absorb impact force generated in the attaching process, the deformation quantity is small, and the generation probability of bubble lines is reduced. The peeling strength of the photosensitive resin plate ranges from 3N / 25mm < 2 > to 8N / 25mm < 2 >, the polaroid can be stably adhered and fixed, the peeling strength is small enough, and the polaroid can smoothly fall off in the transferring and attaching process.

Description

Technical Field

[0001] The present invention relates to the field of photosensitive resin plates for attaching polarizers, and more specifically, to a photosensitive resin plate for attaching polarizers and a method for using the same. Background Art

[0002] In the LCD manufacturing process, polarizers polarize natural light, which normally has no polarity, causing it to enter the panel as polarized light. This, combined with the optical properties of liquid crystal molecules, creates a controllable brightness and darkness output. Polarizers are a key display material, accounting for approximately 6% of the panel's cost. Currently, polarizers are attached to displays using extrusion lamination equipment. During production, most companies encounter problems such as foreign matter on the lamination roller surface, resulting in uneven force on the polarizer and bubbles during the lamination process, causing defects. The current market trend is towards larger displays, and the increase in panel size necessitates optimization of the lamination process. Larger polarizers and displays require more suction cups on the lamination equipment's support platform. This often leads to uneven polarizer surfaces and bubbles. In order to solve the problem of bubble yield during polarizer attachment due to uneven force in the prior art, it is necessary to use a flexible photosensitive resin plate with good surface uniformity to transfer and attach the polarizer.

[0003] Photosensitive resin plates are photopolymerizable relief plates made from photosensitive resins through exposure and development. Based on the resin's pre-molding form, they can be divided into two categories: liquid-curing and solid-hardening. Liquid-curing photosensitive resin plates, also known as liquid resin plates, are viscous, transparent liquids before exposure, and crosslink into a solid state after exposure. The main components of liquid resin plates include resin, crosslinking agent, photoinitiator, and polymerization inhibitor. Resin, the primary component of photosensitive resin plates, is typically an unsaturated resin obtained by polycondensation of aliphatic or aromatic saturated or unsaturated polycarboxylic acids with diols. The crosslinking agent crosslinks the liquid into a solid state under the influence of ultraviolet light. Common crosslinking agents include acrylic acid, oxalic dimethacrylates, and ethylene glycol acrylates. Photoinitiators, also known as photosensitizers, are the mediators that transmit light energy during photopolymerization. Commonly used are benzoin and its ethers. Inhibitors, substances that inhibit the dark reaction, commonly used are p-phenylenediamine. The platemaking process of liquid resin plate generally goes through processes such as laying, exposure, washing, drying and post-exposure. Summary of the Invention

[0004] In order to achieve these purposes and other advantages according to the present invention, on the one hand, a preferred embodiment of the present invention provides a photosensitive resin plate for attaching a polarizer, which is prepared from the following components: polyurethane acrylate, vinyl unsaturated monomer, photoinitiator, and solvent, wherein the polyurethane acrylate, vinyl unsaturated monomer and photoinitiator are mixed to form a resin, the mass ratio between the resin and the solvent is 9:1 to 5:5, the polyurethane acrylate accounts for 40% to 75% of the resin by mass, the vinyl unsaturated monomer accounts for 20% to 55% of the resin by mass, and the initiator accounts for 1% to 6% of the resin by mass.

[0005] According to a preferred embodiment of the present invention, the polyurethane acrylate is any one or more of aliphatic, cycloaliphatic or aromatic polyurethane acrylate.

[0006] According to a preferred embodiment of the present invention, the urethane acrylate contains an acrylic functional group and a urethane bond in its molecule.

[0007] According to a preferred embodiment of the present invention, the vinyl unsaturated monomer is any one or more of isobornyl acrylate, 2-phenoxyethyl acrylate, 2-phenoxyethyl methacrylate, 3,3,5-trimethylcyclohexanol acrylate, 3,3,5-trimethylcyclohexyl methacrylate, tetrahydrofuran acrylate, tetrahydrofuran methacrylate, trimethylolpropane formal acrylate, alicyclic acrylate monomer, lauryl acrylate, lauryl methacrylate, dipropylene glycol diacrylate, 1,4-butanediol diacrylate, 1,6-hexanediol dimethyl propylene, 1,2-dodecanediol dimethacrylate and tricyclodecane dimethanol diacrylate.

[0008] According to a preferred embodiment of the present invention, the photoinitiator is any one or two of photoinitiators such as 2,4,6 (trimethylbenzoyl) diphenylphosphine oxide, ethyl 2,4,6-trimethylbenzoylphosphonate, benzoin dimethyl ether, phenyl bis (2,4,6-trimethylbenzoyl) phosphine oxide, 2,4-diethylthioxanthone, and tetraethyl Michler's ketone.

[0009] According to a preferred embodiment of the present invention, the thickness of the photosensitive resin plate is 1.14 mm to 7 mm.

[0010] According to a preferred embodiment of the present invention, the peel strength of the surface adhesive of the photosensitive resin plate is controlled at 2N / 25mm 2 ~10N / 25mm 2 .

[0011] According to a preferred embodiment of the present invention, the hardness of the photosensitive resin plate is 40° to 80° Shore A hardness.

[0012] On the other hand, one embodiment of the present invention further provides a method for using the photosensitive resin plate for attaching a polarizer, comprising the following steps:

[0013] S1. The glass to be attached with the polarizer is fixed on a platform that can move horizontally. At the same time, the photosensitive resin plate is fixed on the surface of the roller. The polarizer is adsorbed by the viscosity of the surface of the photosensitive resin plate, so that the polarizer is fixed on the surface of the photosensitive resin plate;

[0014] S2. Control the rolling rotation, and at the same time the platform drives the glass forward, the head of the polarizer is close to the head of the glass. Since the surface viscosity of the photosensitive resin plate is weak and the peeling strength is small, the polarizer is separated from the photosensitive resin plate, and the patch is completed.

[0015] The present invention includes at least the following beneficial effects: the photosensitive resin plate of the present invention has different surface viscosities and can adapt to the use requirements of polarizer attachment of different generations. The photosensitive resin plate of the present invention is integrally formed, has a uniform thickness, good surface uniformity of the entire plate, no foreign matter is precipitated on the plate surface, and the polarizer is subjected to uniform force during the attachment process, effectively avoiding the generation of bubbles and improving the production yield of products. The photosensitive resin plate of the present invention can effectively absorb the impact force generated during the attachment process, has a small deformation amount, and reduces the probability of bubble line generation. Moreover, the peeling strength of the photosensitive resin plate of the present invention is 3N / 25mm 2 ~8N / 25mm 2 The polarizer can be stably adhered and fixed, and the peel strength is small enough so that the polarizer can be smoothly removed during the transfer and attachment process. In addition, the method of attaching polarizers using a photosensitive resin plate has the advantages of fast attachment speed, high precision, and high production yield.

[0016] Other advantages, objectives and features of the present invention will be reflected in part from the following description and will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the process of using the photosensitive resin plate for attaching polarizers in the present invention. DETAILED DESCRIPTION

[0018] The present invention will be described in further detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0019] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are for illustrative purposes only, and those skilled in the art will readily appreciate other obvious variations. The basic principles of the present invention defined in the following description may be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0020] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0021] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the elements may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0022] On the one hand, a preferred embodiment of the present invention provides a photosensitive resin plate for attaching a polarizer, which is prepared from the following components: polyurethane acrylate, vinyl unsaturated monomer, photoinitiator, and solvent, wherein the polyurethane acrylate, vinyl unsaturated monomer and photoinitiator are mixed to form a resin, the mass ratio between the resin and the solvent is 9:1 to 5:5, the polyurethane acrylate accounts for 40% to 75% of the resin by mass, more preferably 45% to 70%, the vinyl unsaturated monomer accounts for 20% to 55% of the resin by mass, more preferably 25% to 50%, and the initiator accounts for 1% to 6% of the resin by mass, more preferably 2% to 5%.

[0023] In this embodiment, the polyurethane acrylate is polyester polyurethane acrylate. Specifically, the polyurethane acrylate is any one or more of aliphatic, cycloaliphatic or aromatic polyurethane acrylate.

[0024] Polyurethane acrylate molecules contain acrylic functional groups and urethane bonds.

[0025] The solvent is used to dilute the resin and reduce its viscosity. There is no specific limitation on the solvent. In view of the toxicity, boiling point and price of the solvent, ethyl acetate, n-hexane and tetrahydrofuran are preferred.

[0026] According to a preferred embodiment of the present invention, the vinyl unsaturated monomer is any one or more of isobornyl acrylate, 2-phenoxyethyl acrylate, 2-phenoxyethyl methacrylate, 3,3,5-trimethylcyclohexanol acrylate, 3,3,5-trimethylcyclohexyl methacrylate, tetrahydrofuran acrylate, tetrahydrofuran methacrylate, trimethylolpropane formal acrylate, alicyclic acrylate monomer, lauryl acrylate, lauryl methacrylate, dipropylene glycol diacrylate, 1,4-butanediol diacrylate, 1,6-hexanediol dimethyl propylene, 1,2-dodecanediol dimethacrylate and tricyclodecane dimethanol diacrylate.

[0027] In another technical solution, the photoinitiator is any one or two of photoinitiators such as 2,4,6 (trimethylbenzoyl) diphenylphosphine oxide, 2,4,6-trimethylbenzoyl ethyl phosphonate, benzoin dimethyl ether, phenyl bis (2,4,6-trimethylbenzoyl) phosphine oxide, 2,4-diethylthioxanthone, and tetraethyl Michler's ketone.

[0028] In another technical solution, the thickness of the photosensitive resin plate is 1.14mm to 7mm, more preferably 2.24mm to 3.12mm. If the thickness is too thin, the polarizer's tightness of attachment to the photosensitive resin plate may be affected. A corner of the polarizer may warp before transfer and attachment. The free polarizer is very likely to come into contact with the glass prematurely, resulting in uneven force on the entire polarizer and the formation of bubbles. These bubbles are usually long and located at the edge of the glass.

[0029] In another technical solution, the peel strength of the surface adhesive of the photosensitive resin plate is controlled at 2N / 25mm 2 ~10N / 25mm 2 More preferably 3N / 25mm 2 ~6N / 25mm 2 It can not only stably adhere the polarizer to the photosensitive resin plate, but also prevent the polarizer from sticking to the photosensitive resin plate and causing damage when it is transferred to the glass. It also has the advantages of excellent mechanical properties and dimensional stability.

[0030] In another technical solution, the photosensitive resin plate has a Shore A hardness of 40° to 80°, more preferably 50° to 60°. In conventional polarizer attachment technology for LCD panels, the moment the attachment roller presses down, impacting the adhesive layer of the polarizer, causing deformation and resulting in bubble lines. The appropriate hardness and resin structure of the photosensitive resin plate can absorb the impact force generated during attachment, minimizing deformation and effectively preventing bubble formation.

[0031] Photoresist plate hardness sample preparation and testing: Prepare a 2mm x 2mm x 6mm silicone mold, place it on a PET base film, pour liquid photoresist into the mold, and place it in a UV curing chamber for curing. Hardness is tested according to the Shore A hardness method in GB / T2411-2008.

[0032] Sample preparation and testing of the surface tack of the photosensitive resin plate: The peel strength parameter is used to evaluate the surface tack of the photosensitive resin plate. First, a small laminating machine is used to laminate the cured photosensitive resin plate and polarizer. The lamination must be smooth and free of bubbles. After standing for 24 hours, a cutting plotter is used to cut the sample into 200mm×15mm strips. The peel strength of the sample is tested according to GB / T 8808-1988 Peel Test Method for Soft Composite Plastic Materials.

[0033] On the other hand, one embodiment of the present invention further provides a method for using the photosensitive resin plate for attaching a polarizer, comprising the following steps:

[0034] S1. The glass 4 to be attached with the polarizer is fixed on a platform 5 that can move horizontally. At the same time, the photosensitive resin plate 2 is fixed on the surface of the roller 1. The polarizer is adsorbed by the viscosity of the surface of the photosensitive resin plate 2, so that the polarizer 3 is fixed on the surface of the photosensitive resin plate 2.

[0035] S2. Control the roller 1 to rotate, and at the same time, the platform 5 drives the glass 4 forward, and the head of the polarizer 3 is close to the head of the glass 4. Since the surface viscosity of the photosensitive resin plate is weak and the peeling strength is small, the polarizer can be easily separated from the photosensitive resin plate, and the patch is completed.

[0036] In order to verify the formulation and use effect of the photosensitive resin plate in the present invention, the following experiments were conducted, wherein:

[0037] The commercial products of each ingredient in the embodiment formula are as follows:

[0038] Commercial polyester polyurethane acrylate products: CN975, CN228, CN9014, CN965SF, all of which are from Sartomer, but are not limited to Sartomer's products, and the same substances from other companies can also be used.

[0039] Initiators: TPO, TPO-L, BDK, 819, DETX, all from Kunshan Custer Company. Products of this company are not limited to Kunshan Custer Company, and the same substances from other companies can also be used.

[0040] Ethylene-unsaturated monomers: Lauryl methacrylate (SR-313), lauryl acrylate (SR-336), isobornyl acrylate (SR-506), Sartomer. Products from other companies are not limited to Sartomer; similar materials can also be used.

[0041] Among them, Examples 1 to 5 are all obtained using the formula of the present invention, but the raw materials therein are actually commercial products of different models.

[0042] Comparative Example 1 is a product purchased by the company (Japan). The surface viscosity of this product is too high and it is easy to adhere to the polarizer, but there is a problem of difficulty in falling off the polarizer during the polarizer transfer and attachment process.

[0043] Comparative Example 2 is a product of a domestic company, which is a general-purpose flexible printing plate. The surface viscosity of this plate is low and it cannot adhere to the polarizer well. The polarizer is prone to one corner being lifted up, and bubbles are generated during attachment.

[0044] Table 1 Formula of each embodiment

[0045]

[0046] From the data in Table 1, it can be seen that Examples 1-5 all have a relatively suitable hardness between 50 and 80, which can effectively buffer the impact force generated at the moment of attachment, and the peel strength is 3N / 25mm. 2 ~8N / 25mm 2 The polarizer can be stably adhered and fixed, and the peel strength is low enough to allow the polarizer to be smoothly removed during the transfer and attachment process. Comparative Example 1 has high peel strength and can smoothly and effectively adsorb and fix the polarizer, but due to its high viscosity, the polarizer is difficult to remove and transfer. Comparative Example 2 has low peel strength and low viscosity on the plate surface, making it difficult to adsorb and fix the polarizer.

[0047] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A photosensitive resin plate for attaching a polarizer, characterized in that: The invention is prepared from the following components: polyurethane acrylate, vinyl unsaturated monomer, photoinitiator and solvent, wherein the polyurethane acrylate, vinyl unsaturated monomer and photoinitiator are mixed to form a resin, the mass ratio between the resin and the solvent is 9:1-5:5, the mass ratio of the polyurethane acrylate to the resin is 40%-75%, the mass ratio of the vinyl unsaturated monomer to the resin is 20%-55%, and the mass ratio of the initiator to the resin is 1%-6%.

2. The photosensitive resin plate for attaching a polarizer according to claim 1, characterized in that: The polyurethane acrylate is any one or more of aliphatic, cycloaliphatic or aromatic polyurethane acrylate.

3. The photosensitive resin plate for attaching a polarizer according to claim 1, characterized in that: The molecule of polyurethane acrylate contains acrylic functional groups and urethane bonds.

4. The photosensitive resin plate for attaching a polarizer according to claim 1, characterized in that: The vinyl unsaturated monomer is any one or more of isobornyl acrylate, 2-phenoxyethyl acrylate, 2-phenoxyethyl methacrylate, 3,3,5-trimethylcyclohexanol acrylate, 3,3,5-trimethylcyclohexyl methacrylate, tetrahydrofuran acrylate, tetrahydrofuran methacrylate, trimethylolpropane formal acrylate, alicyclic acrylate monomer, lauryl acrylate, lauryl methacrylate, dipropylene glycol diacrylate, 1,4-butanediol diacrylate, 1,6-hexanediol dimethyl acrylate, 1,2-dodecanediol dimethacrylate and tricyclodecane dimethanol diacrylate.

5. The photosensitive resin plate for attaching a polarizer according to claim 1, characterized in that: The photoinitiator is any one or two of 2,4,6 (trimethylbenzoyl) diphenylphosphine oxide, ethyl 2,4,6-trimethylbenzoylphosphonate, benzoin dimethyl ether, phenyl bis (2,4,6-trimethylbenzoyl) phosphine oxide, 2,4-diethylthioxanthone, tetraethyl Michler's ketone and the like.

6. The method for using the photosensitive resin plate for attaching a polarizer according to claim 1, characterized in that: The thickness of the photosensitive resin plate is 1.14mm to 7mm.

7. The method for using the photosensitive resin plate for attaching a polarizer according to claim 1, characterized in that: The peel strength of the surface adhesive of the photosensitive resin plate is controlled at 2N / 25mm 2 ~10N / 25mm 2 .

8. The method for using the photosensitive resin plate for attaching a polarizer according to claim 1, characterized in that: The hardness of the photosensitive resin plate is 40° to 80° Shore A hardness.

9. The method for using the photosensitive resin plate for attaching a polarizer according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. The glass to be attached with the polarizer is fixed on a platform, which can move horizontally. At the same time, the photosensitive resin plate is fixed on the surface of the roller, and the polarizer is adsorbed by the viscosity of the surface of the photosensitive resin plate, so that the polarizer is fixed on the surface of the photosensitive resin plate; S2, control the rolling rotation, and at the same time the platform drives the glass forward, the head of the polarizer is close to the head of the glass, the polarizer is separated from the photosensitive resin plate, and the patch is completed.

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