A catalytic composition for preparing a polyethylene terephthalate (PET) resin is provided. The catalytic composition comprises a polycondensation catalyst and cesium tungsten oxide (Cs.sub.xWO.sub.3-yCl.sub.y), and 0<x≦1 and 0≦y≦0.5. A PET resin prepared by the catalytic composition above is also provided. The PET resin comprises 2-80 ppm of cesium tungsten oxide. This catalytic composition can solve the problems of slow solid-state polymerization rate of the PET preparation and thus the long preparation time, as well as yellowing. Moreover, the PET resin can absorb infrared radiation.

Through the present invention, by undergoing a step in which a straight-chain diorganopolysiloxane having silanol groups at both terminal ends of the molecular chain thereof, a hydrolyzable silane and/or a partial hydrolysis condensate thereof having a hydrolyzable group capable of detaching a lactic acid ester, and an amino-group-containing hydrolyzable organosilane and/or a partial hydrolysis condensate thereof are pre-mixed/reacted in advance and silanol groups at both terminal ends of the molecular chain of a main agent (base polymer) are blocked by specific hydrolyzable silyl groups, it is possible to manufacture a lactic-acid-ester-type room-temperature-curable organopolysiloxane composition excellent in all characteristics including curability, adhesive properties, workability, and the like that were not attainable by the conventional lactic-acid-ester-type room-temperature curable (RTV) silicone rubber composition.

Through the present invention, by undergoing a step in which a straight-chain diorganopolysiloxane having silanol groups at both terminal ends of the molecular chain thereof, a hydrolyzable silane and/or a partial hydrolysis condensate thereof having a hydrolyzable group capable of detaching a lactic acid ester, and an amino-group-containing hydrolyzable organosilane and/or a partial hydrolysis condensate thereof are pre-mixed/reacted in advance and silanol groups at both terminal ends of the molecular chain of a main agent (base polymer) are blocked by specific hydrolyzable silyl groups, it is possible to manufacture a lactic-acid-ester-type room-temperature-curable organopolysiloxane composition excellent in all characteristics including curability, adhesive properties, workability, and the like that were not attainable by the conventional lactic-acid-ester-type room-temperature curable (RTV) silicone rubber composition.

The disclosure generally relates to a dispersion of nanoparticles in a liquid medium. The liquid medium is suitably water-based and further includes an ionic liquid-based stabilizer in the liquid medium to stabilize the dispersion of nanoparticles therein. The stabilizer can be polymeric or monomeric and generally includes a moiety with at least one quaternary ammonium cation from a corresponding ionic liquid. The dispersion suitably can be formed by shearing or otherwise mixing a mixture/combination of its components. The dispersions can be used to form nanoparticle composite films upon drying or otherwise removing the liquid medium carrier, with the stabilizer providing a nanoparticle binder in the composite film. The films can be formed on essentially any desired substrate and can impart improved electrical conductivity and/or thermal conductivity properties to the substrate.

Provided are a cured material having a high refractive index for an optical member obtained by preparing a stable dispersion with a small amount of dispersant, and a process for producing dispersion of fine inorganic particles which is capable of drastically shortening the dispersion process time without causing overdispersion under the conditions of high solid concentration and without using media having a small particle size, which are very expensive and for which available dispersing machines are limited. Provided are a process for producing dispersion of fine inorganic particles using a media type wet dispersing machine, which includes supplying the following (A) to (D) to the wet dispersing machine, provided that (D) is supplied last to the wet dispersing machine: (A) Zirconium oxide nanoparticle, (B) Silane coupling agent, (C) Dispersion medium, and (D) Dispersant;
a curable composition containing a dispersion obtained by the producing process; and a cured material obtained therefrom.

Provided are a cured material having a high refractive index for an optical member obtained by preparing a stable dispersion with a small amount of dispersant, and a process for producing dispersion of fine inorganic particles which is capable of drastically shortening the dispersion process time without causing overdispersion under the conditions of high solid concentration and without using media having a small particle size, which are very expensive and for which available dispersing machines are limited. Provided are a process for producing dispersion of fine inorganic particles using a media type wet dispersing machine, which includes supplying the following (A) to (D) to the wet dispersing machine, provided that (D) is supplied last to the wet dispersing machine: (A) Zirconium oxide nanoparticle, (B) Silane coupling agent, (C) Dispersion medium, and (D) Dispersant;
a curable composition containing a dispersion obtained by the producing process; and a cured material obtained therefrom.

The present invention is intended to provide a laminated film including a void-provided layer achieving both a high proportion of void space and a high film strength. The laminated film of the present invention includes a void-provided layer 21 and a resin film 10, the void-provided layer 21 being stacked on the resin film 10. The laminated film is produced by a production method, including steps of forming a void-provided structure 20′, which is a precursor of the void-provided layer 21 on the resin film; and causing a crosslinking reaction in the precursor 20′ after the precursor forming step. The precursor 20′ contains a substance that generates a basic substance by light irradiation or heating, the basic substance is not generated in the precursor forming step, the basic substance is generated by light irradiation or heating in the crosslinking reaction step, and the crosslinking reaction step has multiple stages.

The present invention is intended to provide a laminated film including a void-provided layer achieving both a high proportion of void space and a high film strength. The laminated film of the present invention includes a void-provided layer 21 and a resin film 10, the void-provided layer 21 being stacked on the resin film 10. The laminated film is produced by a production method, including steps of forming a void-provided structure 20′, which is a precursor of the void-provided layer 21 on the resin film; and causing a crosslinking reaction in the precursor 20′ after the precursor forming step. The precursor 20′ contains a substance that generates a basic substance by light irradiation or heating, the basic substance is not generated in the precursor forming step, the basic substance is generated by light irradiation or heating in the crosslinking reaction step, and the crosslinking reaction step has multiple stages.

In one aspect, the present invention is directed to a coating composition. The coating composition comprises photocatalytic particles and an alkali metal silicate binder comprising an alkoxysilane. In another aspect, the present invention is directed to a coated article. The coated article has a photocatalytic coating with improved durability on its external surface that is formed from the aforesaid coating composition.

In one aspect, the present invention is directed to a coating composition. The coating composition comprises photocatalytic particles and an alkali metal silicate binder comprising an alkoxysilane. In another aspect, the present invention is directed to a coated article. The coated article has a photocatalytic coating with improved durability on its external surface that is formed from the aforesaid coating composition.