Transparent inorganic-oxide dispersion, resin composition containing inorganic oxide particles, composition for encapsulating luminescent element, luminescent element, hard coat, optical functional fi

Abstract

A transparent inorganic-oxide dispersion which contains inorganic oxide particles whose surface has been modified with a surface modifier having one or more reactive functional groups and, due to this, enables improvements in refractive index and mechanical properties and retention of transparency; and an inorganic-oxide-particle-containing resin composition obtained by combining and uniting this transparent inorganic-oxide dispersion with a resin through a polymerization reaction. Also provided are: a composition for encapsulating luminescent elements; a luminescent element; a process for producing the resin composition containing inorganic oxide particles; a hard coat and an optical functional film which have high transparency and can attain improvements in refractive index and toughness; an optical lens; and an optical part. The transparent inorganic-oxide dispersion is characterized by comprising a dispersion medium and inorganic oxide particles the surface of which has been modified with a surface modifier having one or more reactive functional groups and which have a dispersed-particle diameter of 1 to 20 nm. It is further characterized in that the surface modifier is one or more members selected from the group consisting of silane coupling agents, modified silicones, and surfactants.

Description

[0001] technology area [0002] The present invention relates to a method for preparing a transparent inorganic oxide dispersion liquid, a resin composition containing inorganic oxide particles, a composition for sealing light-emitting elements, a light-emitting element, and a resin composition containing inorganic oxide particles. More specifically, it relates to A transparent inorganic oxide dispersion that is used as a filler for resins and is capable of maintaining transparency while improving the refractive index and mechanical properties, and an inorganic compound that combines the transparent inorganic oxide dispersion and a resin through a polymerization reaction. Oxide particle-containing resin composition, composition for sealing a light-emitting element, light-emitting element, and method for producing an inorganic oxide particle-containing resin composition. [0003] In addition, the present invention relates to a composition for sealing a light-emitting element capa...

AI Technical Summary

Problems solved by technology

Thus, it is difficult to maintain transparency on thick substrates

[0045] For example, in the case of the above-mentioned conventional zirconia particle composite plastic film, a high refractive index and high transparency are ensured by making the thickness several μm, so it is difficult to maintain transparency when the thickness is several tens of μm or more.

[0046] In this way, although studies have been made on zirconia particle-composite plastic films, the current status is that there is no research on the refractive index or transparency when zirconia particle-composite plastics are used as bulk materials.

[0047] In addition, if the conventional inorganic oxide particles are combined with a hydrophobic resin, the surface of the inorganic oxide particles becomes hydrophilic, so the inorganic oxide particles may separate from the resin, or may become cloudy even though they are not separated. On the other hand, there is a problem that it is difficult to composite with inorganic oxide particles while maintaining the transparency of the resin due to defects such as devitrification.

[0048] Therefore, as a general solution, in order to hydrophobize the surface of the inorganic oxide particle, a surface modifying agent such as an organic polymer dispersant is given to the surface of the inorganic oxide particle, thereby improving the quality of the inorganic oxide particle and the resin. However, the composite of the hydrophobized inorganic oxide particles and the resin has the advantages of increasing the mechanical properties and refractive index of the composite itself, but the particle size of the inorganic oxide particles is relatively large , is more than 20nm, so the transparency is reduced, and there is a problem of devitrification depending on the situation

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