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KR-102962509-B1 - Composition, cured body, encapsulation material for organic electroluminescent display device and organic electroluminescent display device

KR102962509B1KR 102962509 B1KR102962509 B1KR 102962509B1KR-102962509-B1

Abstract

A composition comprising a monomer component containing a fluorine-containing monomer having a fluorine atom and a carbon-carbon unsaturated double bond, and a photopolymerization initiator, wherein at least a portion of the monomer component is a high-viscosity monomer with a viscosity of 50 mPa·s or more as measured by an E-type viscometer at 25°C, and a viscosity of 3 mPa·s or more and 50 mPa·s or less as measured by an E-type viscometer at 25°C.

Inventors

  • 사사키 마키코
  • 야마시타 유키히코
  • 쿠리무라 히로유키

Assignees

  • 덴카 주식회사

Dates

Publication Date
20260507
Application Date
20201117
Priority Date
20191118

Claims (11)

  1. A monomer component containing a fluorine-containing monomer having a fluorine atom and a carbon-carbon unsaturated double bond, and Includes a photopolymerization initiator, 5 to 23 mass% of the above monomer component is a high-viscosity monomer with a viscosity of 50 mPa·s or higher as measured by an E-type viscometer at 25°C, and 0.1 to 10 mass% of the above monomer component is the above fluorine-containing monomer, and 70 to 98 mass% of the above monomer component is a polyfunctional monomer having two or more carbon-carbon unsaturated double bonds, and A composition having a viscosity of 3 mPa·s or more and 50 mPa·s or less, measured by an E-type viscometer at 25℃.
  2. A composition according to claim 1, wherein at least a portion of the high-viscosity monomer is a monofunctional monomer having one carbon-carbon unsaturated double bond.
  3. A composition according to claim 2, wherein 10 to 60 mass% of the high-viscosity monomer is the monofunctional monomer.
  4. A composition of claim 1, which is an encapsulating agent for an organic electroluminescent display device.
  5. A cured body formed by curing a composition described in any one of claims 1 to 4.
  6. Encapsulation material for an organic electroluminescent display device comprising the cured body described in claim 5.
  7. It includes a laminate in which an inorganic film and an organic film are stacked, Encapsulation material for an organic electroluminescent display device, wherein the above organic film comprises a cured body as described in claim 5.
  8. Organic electroluminescent display device, and An organic electroluminescent display device comprising an encapsulation material for an organic electroluminescent display element as described in claim 6.
  9. Organic electroluminescent display device, and An organic electroluminescent display device comprising an encapsulation material for an organic electroluminescent display element as described in claim 7.
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Description

Composition, cured body, encapsulation material for organic electroluminescent display device and organic electroluminescent display device The present invention relates to a composition and a cured body thereof. In addition, the present invention relates to an encapsulation material for an organic electroluminescence (EL) display device and an organic EL display device including the same. Organic electroluminescent display devices (also known as organic EL display devices, organic EL devices, or OLED devices) are attracting attention as devices capable of emitting high brightness. However, organic EL display devices have a problem in that their luminescence characteristics deteriorate due to moisture. To solve these problems, a technology is being considered to encapsulate an organic EL display device using an encapsulation material in which an organic film and an inorganic film are laminated, and to prevent degradation due to moisture (e.g., Patent Documents 1 and 2). Hereinafter, preferred embodiments of the present invention will be described in detail. <Composition> The composition of the present embodiment comprises a monomer component containing a fluorine-containing monomer and a photopolymerization initiator. In the present embodiment, at least a portion of the monomer component is a high-viscosity monomer with a viscosity of 50 mPa·s or higher as measured by an E-type viscometer at 25°C. Additionally, the composition of the present embodiment has a viscosity of 3 mPa·s or higher and 50 mPa·s or lower as measured by an E-type viscometer at 25°C. Since the composition of the present embodiment has a viscosity within the above range, it can be suitable for use in inkjet methods, and because it has excellent surface flatness and straightness, it can accurately form an organic film with minimal surface irregularities within a predetermined range. The reasons for the above effects are not necessarily limited, but are thought to be as follows. First, since the composition of the present embodiment contains a fluorine-containing monomer, the surface free energy is lowered, making it easier to flatten the surface of the coating film after application, and thus it is thought that an organic film with few surface irregularities can be formed. In addition, since the composition of the present embodiment contains a high-viscosity monomer, it becomes difficult to meander when ejected from an inkjet nozzle (i.e., straightness is improved), making it possible to form an accurate organic film within a predetermined range. At least some of the monomer components of the present embodiment are high-viscosity monomers with a viscosity of 50 mPa·s or higher as measured by an E-type viscometer at 25°C. The viscosity of the high-viscosity monomer is preferably 100 mPa·s or higher, and more preferably 150 mPa·s or higher. In addition, the viscosity of the high-viscosity monomer is preferably 1000 mPa·s or lower, more preferably 500 mPa·s or lower, and even more preferably 300 mPa·s or lower. That is, the viscosity of the high-viscosity monomer is the viscosity measured by an E-type viscometer at 25°C, for example, 50 to 1000 mPa·s, 50 to 500 mPa·s, 50 to 300 mPa·s, 100 to 1000 mPa·s, 100 to 500 mPa·s, 100 to 300 mPa·s, 150 to 1000 mPa·s, 150 to 500 mPa·s, or 150 to 300 mPa·s. The viscosity of the composition of the present embodiment (viscosity measured by an E-type viscometer at 25°C) is 3 mPa·s or higher, preferably 5 mPa·s or higher, and more preferably 10 mPa·s or higher. In addition, the viscosity of the composition of the present embodiment (viscosity measured by an E-type viscometer at 25°C) is 50 mPa·s or lower, preferably 45 mPa·s or lower, and more preferably 40 mPa·s or lower. With this viscosity range, surface flatness tends to be further improved. That is, the viscosity of the composition of the present embodiment is a viscosity measured by an E-type viscometer at 25°C, for example, 3 to 50 mPa·s, 3 to 45 mPa·s, 3 to 40 mPa·s, 5 to 50 mPa·s, 5 to 45 mPa·s, 5 to 40 mPa·s, 10 to 50 mPa·s, 10 to 45 mPa·s, or 10 to 40 mPa·s. The composition of the present embodiment may contain a high-viscosity monomer and a low-viscosity monomer (a monomer with a viscosity of less than 50 mPa·s measured by an E-type viscometer at 25°C) as monomer components. The ratio of the high-viscosity monomer and the low-viscosity monomer may be appropriately changed within the range in which the viscosity of the composition is within the above numerical range. The proportion of high-viscosity monomers in the monomer components may be, for example, 5 mass% or more, preferably 7 mass% or more, and more preferably 9 mass% or more. Increasing the proportion of high-viscosity monomers tends to further improve straightness. In addition, the proportion of high-viscosity monomers in the monomer components may be, for example, 65 mass% or less, preferably 60 mass% or less, more preferably 55 mass% or less, 50 mass% or less, 45 mass% or less, 40 mas