Coating composition, porous film, light-scattering film, and organic electroluminescent element
A composition and coating technology, applied in electroluminescent light sources, diffusing elements, optical elements, etc., can solve the problems of inability to use plastic materials, poor versatility, etc., and achieve excellent surface smoothness, excellent heat resistance, high light The effect of transmittance
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[0089] (5) Preparation of coating composition
[0090] In the above composition, the mixing ratio of the metal oxide and the polysilane compound is 99:1-1:99, preferably 95:5-30:70, more preferably 90:10-40:60. As described above, voids are formed in the cured product obtained by curing the composition of the present invention. It is presumed that the voids are formed as follows: in the process of drying and removing the solvent, the mixture of the metal oxide particles and the polysilane compound phase-separates from the solvent, and at the same time, bubbles are incorporated and aggregated and combined to form voids. Therefore, if the above When the mixing ratio is low, phase separation, bubble incorporation, agglomeration, and bonding can proceed smoothly, and the control of the diameter and porosity of voids can be easily adjusted.
[0091] When preparing the composition, the following methods can be appropriately selected: a solution in which a polysilane compound is dis...
Embodiment 1
[0262]
[0263] 8.0 g of propylene glycol monomethyl ether acetate (hereinafter referred to as "PGMEA") was added to 2.0 g of polysilane "OGSOL SI-20-10 (modified)" manufactured by OSAKA GAS CHEMICALS, and dissolved with stirring. This solution was filtered with a 0.2 μm PTEF filter (Autovial AV125EORG) to prepare “SI-20-10 (modified) PGMEA solution (20 wt %)”.
[0264] Then, in 1.0 g of "SI-20-10 (modified) PGMEA solution (20wt%)", add the zinc oxide nanoparticle dispersion liquid "NANOBYK-3841" (the primary particle size of zinc oxide is 40nm) manufactured by BYK Japan Co., Ltd. . The average particle diameter measured by dynamic light scattering was 125 nm, and a solvent substance: PEGMEA) 2.0 g was stirred for 1 minute using a pencil mixer to prepare a scattering layer coating liquid.
[0265]On a glass substrate "OA-10G" (37.5 mm x 25 mm x 0.7 mm thick) manufactured by NEC Glass Co., Ltd., 0.3 ml of the above-mentioned scattering layer coating solution was placed and sp...
Embodiment 2～4
[0269]
[0270] Using the scattering layer coating solution prepared in Example 1, spin coating was performed on a glass substrate under the same conditions as in Example 1, and preliminary drying was performed on a hot plate at 120° C. for 2 minutes. Next, main drying was performed at 220° C. (Example 2), 170° C. (Example 3), or 120° C. (Example 4) for 30 minutes, followed by natural cooling to obtain scattering layers 2 to 4 on the glass substrates.
[0271] It was confirmed by SEM observation that voids were formed on the surface and cross-section of any of the scattering layers.
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