JP-7856861-B2 - Method for manufacturing a dispersion, dispersion, low refractive index layer, optical component, optical device, method for manufacturing a low refractive index layer, method for manufacturing an optical component, and method for manufacturing an optical device

Inventors

• 服部 大輔
• 吉見 俊哉
• 佐藤 啓介

Assignees

• 日東電工株式会社

Dates

Publication Date

20260511

Application Date

20250221

Priority Date

20240222

Claims (10)

1. A method for producing a dispersion liquid in which particles are dispersed in a dispersion medium, The aforementioned particles are condensates of raw materials containing alkoxysilane, The first grinding step, the concentration step, and the second grinding step are carried out in this order. The first grinding step is a step of grinding the particles in the liquid in which the particles are dispersed in the dispersion medium, The aforementioned concentration step is a step of concentrating the liquid, The second grinding step is a step of further grinding the particles in the liquid that were ground in the first grinding step, The viscosity of the liquid after the second grinding step is greater than the viscosity of the liquid after the first grinding step, or the concentration of the particles in the liquid after the second grinding step is greater than the concentration of the particles in the liquid after the first grinding step. A method for producing the product, characterized in that the concentration of the particles in the produced dispersion is 3.5% by weight or more.
2. A method for producing a dispersion liquid in which solid components containing particles are dispersed in a dispersion medium, The aforementioned particles are condensates of raw materials containing alkoxysilane, The first grinding step, the concentration step, and the second grinding step are carried out in this order. The first grinding step is a step of grinding the particles in the liquid in which the solid content is dispersed in the dispersion medium, The aforementioned concentration step is a step of concentrating the liquid, The second grinding step is a step of further grinding the particles in the liquid that were ground in the first grinding step, The viscosity of the liquid after the second grinding step is greater than the viscosity of the liquid after the first grinding step, or the concentration of the solids in the liquid after the second grinding step is greater than the concentration of the solids in the liquid after the first grinding step. A manufacturing method characterized in that the concentration of the solid content in the manufactured dispersion is 3.5% by weight or more.
3. The pressure during the first grinding step is equal to or equal to or less than the pressure during the second grinding step, and A manufacturing method according to claim 1 or 2, which satisfies all of the following relational expressions (1) to (3). Particle size D50 after the concentration process > Particle size D50 after the first grinding (1) The particle size D50 after the concentration process > the particle size D50 after the second grinding (2) (3) The particle size D50 of the particles after the first grinding is greater than or equal to the particle size D50 of the particles after the second grinding.
4. The pressure during the first grinding step is greater than the pressure during the second grinding step, A manufacturing method according to claim 1 or 2, which satisfies all of the following relational expressions (1) to (3). Particle size D50 after the concentration process > Particle size D50 after the first grinding (1) The particle size D50 after the concentration process > the particle size D50 after the second grinding (2) The particle size D50 of the particles after the first grinding is ≤ the particle size D50 of the particles after the second grinding. (3)
5. The manufacturing method according to claim 1 or 2, wherein the pressure in the first grinding step is 50 MPa or more.
6. A step of producing the dispersion by the manufacturing method described in claim 1 or 2, A method for producing a low refractive index layer, comprising the steps of coating a substrate with the dispersion liquid and drying the coated dispersion liquid.
7. The manufacturing method according to claim 6 , wherein the refractive index of the low refractive index layer produced is 1.25 or less.
8. The manufacturing method according to claim 6 , wherein the thickness of the low refractive index layer produced is 800 nm or more.
9. A method for manufacturing an optical component including a low refractive index layer, characterized in that the low refractive index layer is manufactured by the manufacturing method described in claim 6 .
10. A method for manufacturing an optical device including an optical component, characterized in that the optical component is manufactured by the manufacturing method described in claim 9 .

Description

This disclosure relates to a method for producing a dispersion, a dispersion, a low refractive index layer, an optical component, an optical device, a method for producing a low refractive index layer, a method for producing an optical component, and a method for producing an optical device. In optical devices, for example, an air layer with a low refractive index is used as the total reflection layer. Specifically, for example, in liquid crystal devices, each optical film component (e.g., a light guide plate and a reflector plate) is laminated with an air layer in between. However, when components are separated by an air layer, problems such as component deflection may occur, especially when the components are large. Therefore, it has been proposed to use a low refractive index layer instead of an air layer. For example, a method has been used in which a low refractive index layer is formed on a light guide plate, optically isolating the light guided into the light guide plate, and guiding the light without being affected by external factors such as dirt or scratches on the light guide plate. Patent Document 1 describes a method in which a low refractive index layer is laminated via an adhesive layer that is bonded to the light guide plate for the purpose of protecting the light. As a method for forming such a low refractive index layer, for example, Patent Document 2 describes the application of a coating liquid by roll-to-roll method. Patent No. 6606518Patent No. 6599699 Next, we will provide a more detailed explanation of this disclosure with examples. However, this disclosure is not limited in any way by the following explanation. In this disclosure, the "solvent" (e.g., a solvent for gel production used in the production of a dispersion, a substitution solvent, a solvent for producing a low refractive index layer, etc.) does not necessarily have to dissolve the gel or its pulverized material, particles, etc. For example, the gel or its pulverized material, etc. may be dispersed or precipitated in the solvent. For example, an organic solvent may be used as the dispersion medium in the dispersion of this disclosure. In this disclosure, “adhesive layer” means a layer formed by at least one of an adhesive and an adhesive. In this disclosure, unless otherwise specified, an “adhesive layer” may be an “adhesive layer” formed by an adhesive, an “adhesive layer” formed by an adhesive, or a layer containing both an adhesive and an adhesive. In this disclosure, adhesives and adhesives may be collectively referred to as “adhesive.” Generally, agents with relatively weak adhesive strength (e.g., agents that allow for re-peeling of the bonded object) are sometimes called “adhesives,” and agents with relatively strong adhesive strength (e.g., agents that make re-peeling of the bonded object impossible or extremely difficult) are sometimes called “adhesives.” In this disclosure, there is no clear distinction between adhesives and adhesives. Also, in this disclosure, there is no clear distinction between “adhesive strength” and “bonding strength.” In this disclosure, unless otherwise specified, "mass%" and "weight%" may be interpreted as interchangeable, and "parts of mass" and "parts of weight" may be interpreted as interchangeable. Furthermore, in this disclosure, "on top of" or "on the surface" may refer to a state of direct contact with the top of or on the surface, or it may refer to a state of contact with other layers, etc. [1. Dispersion and method for producing the same] The method for producing the first dispersion of this disclosure is as described above. A method for producing a dispersion liquid in which particles are dispersed in a dispersion medium, The aforementioned particles are condensates of raw materials containing alkoxysilane, The first grinding step, the concentration step, and the second grinding step are carried out in this order. The first grinding step is a step of grinding the particles in the liquid in which the particles are dispersed in the dispersion medium, The aforementioned concentration step is a step of concentrating the liquid, The second grinding step is a step of further grinding the particles in the liquid that were ground in the first grinding step, The viscosity of the liquid after the second grinding step is greater than the viscosity of the liquid after the first grinding step, or the concentration of the particles in the liquid after the second grinding step is greater than the concentration of the particles in the liquid after the first grinding step. The manufactured dispersion is characterized in that the concentration of the particles is 3.5% by weight or more. The method for producing the second dispersion of this disclosure is as described above. A method for producing a dispersion liquid in which solid components containing particles are dispersed in a dispersion medium, The aforementioned particles are condensates of raw materials containing alkoxysilane, The firs