KR-20260064786-A - UV CURABLE PROTECTIVE MATERIAL COMPOSITION WITH EXCELLENT FLAME RETARDANCY AND LED DISPLAY USING THE SAME

Abstract

The present invention relates to a UV-curable protective material with excellent flame retardancy and an LED display using the same. Specifically, the invention comprises an oligomer having at least one backbone selected from polyisobutylene and hydrogenated polybutadiene and having a difunctional acrylic group; an acrylic monomer; a solid flame retardant comprising a photoinitiator and phosphorus. The present invention relates to a UV-curing protective material suitable for application to LED displays, etc., by including at least 10% by weight of the phosphorus based on the total weight of the solid flame retardant, and having excellent flame retardancy, optical properties, and durability.

Inventors

• 김세라
• 유현지
• 신문철
• 김현아

Assignees

• 주식회사 오플렉스

Dates

Publication Date

20260508

Application Date

20241029

Claims (9)

1. In a UV-curing protective material composition, The solid flame retardant comprises an oligomer having at least one skeleton selected from polyisobutylene and hydrogenated polybutadiene and having a difunctional acrylic group; an acrylic monomer; a photoinitiator; and phosphorus, wherein the solid flame retardant has a D90 particle size of 2 to 20 μm. A UV-curable protective material composition comprising at least 10% by weight based on the total weight of the solid flame retardant.
2. In Article 1, The above UV-curable protective material composition is a UV-curable protective material composition having a viscosity of 10 to 3000 cps before UV curing.
3. In Article 1, The above UV-curable protective material composition is a UV-curable protective material composition having a light transmittance of 75% or more at a thickness of 50 μm after UV curing.
4. In Article 1, The above UV-curable protective material composition is a UV-curable protective material composition having a tack strength of 20 gf or less after UV curing.
5. In Article 1, The above solid flame retardant is a UV-curing protective material composition that is a non-halogen solid flame retardant.
6. In Article 1, The above solid flame retardant is a UV-curing protective material composition comprising an organic flame retardant and an inorganic flame retardant.
7. In Article 1, The above UV-curable protective material composition is a UV-curable protective material composition having a Young's modulus of 100 to 7000 MPa at 25°C.
8. In Article 1, The above UV-curing protective material composition further comprises at least one of a pigment, a dye, an antioxidant, a heat stabilizer, a UV stabilizer, a UV absorber, and an antistatic agent.
9. A circuit board or display panel comprising a UV-curable protective material composition according to any one of claims 1 to 8.

Description

UV-curable protective material composition with excellent flame retardancy and LED display using the same The present invention relates to an ultraviolet-curable protective material with excellent flame retardancy and an LED display using the same. Specifically, the invention relates to an ultraviolet-curable protective material composition that is suitable for application to LED displays, etc., by including a solid flame retardant containing phosphorus, wherein the solid flame retardant has a D90 particle size of 2 to 20 μm and the phosphorus is included in an amount of 10 weight% or more based on the total weight of the solid flame retardant. Since LEDs are sensitive to heat and humidity, using them without proper protection may lead to degradation over time and a shortened lifespan. Furthermore, high durability is required for displays that are heavily exposed to the external environment, such as outdoor billboards or portable devices. In particular, because flammable materials are used in LED displays, there is a risk of significantly increasing damage in the event of a fire; therefore, protective materials with flame-retardant properties must be applied. To date, various technologies have been attempted to impart flame-retardant performance to the protective layer of LED displays. However, in the case of halogen-based flame retardants with excellent flame retardancy, their usage is regulated due to environmental concerns, making it impossible to apply a sufficient amount of halogen-based flame retardant to impart flame retardancy. In the case of non-halogen-based flame retardants, an excessive amount of flame retardant is required to secure sufficient flame-retardant properties. However, if an excessive amount of solid flame retardant is used, there is a risk that optical properties will deteriorate, and if a liquid flame retardant is used, the adhesion and durability are weak due to fluidity, making it unsuitable as a protective material. Accordingly, the inventors continued research on the development of a protective material capable of solving the above problems, and confirmed that using a solid flame retardant having an appropriate D90 particle size and an appropriate phosphorus content results in excellent flame retardancy as well as superior optical properties and durability, making it suitable for application in LED displays, and thus completed the present invention. A brief description of each drawing is provided to help to better understand the drawings cited in the detailed description of the invention. FIG. 1 is a cross-sectional view of an LED display panel according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of an LED display panel according to another embodiment of the present invention. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by a skilled expert in the art to which the present invention pertains. In general, the nomenclature used herein is well known and commonly used in the art. Furthermore, in describing embodiments of the present invention, detailed descriptions of related known components or functions are omitted if it is determined that such detailed descriptions would hinder understanding of the embodiments of the present invention. Additionally, while embodiments of the present invention will be described below, the technical concept of the present invention is not limited or restricted thereto and can be modified and implemented in various ways by those skilled in the art. In this specification, when a part is described as being "connected," "attached," "adhered," or "adhered" to another part, this includes not only cases where they are "directly connected," but also cases where they are "electrically connected" with other elements interposed between them. In this specification, when it is said that a member is located "on," "on," "on top," "below," or "below" another member, this includes not only cases where a member is in contact with another member, but also cases where another member exists between the two members. In this specification, when a member is described as being located "directly on," "directly on the upper part," "directly on the top part," "directly below," "directly on the lower part," or "directly on the bottom part" of another member, it means that it is in contact with the other member and that no other member exists between the two members. In this specification, spatially relative terms such as "below," "beneath," "lower," "above," and "upper" may be used to easily describe the relationship with the components as illustrated in the drawings. In this specification, when a part is described as including a certain component, it means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. In this specification, the term "and/or" includes a combination of a plurality of related items or a