Ishihara Sangyo Kaisha, Ltd.

Masanori Tomonari

Kiyonobu Ida

Kaoru Isobe

Masatoshi Honma

Yoichi Takaoka

Satoshi Nagamori

Yoshio Hirobe

Yoshiyuki Kunifusa

Tsutomu Kikuchi

Yuto Kameda

Yoshiki Kinoshita

Takuya Hosokawa

The present invention manufactures titanium oxide particles that have a small degree of aggregation (size of aggregate particle diameter relative to primary particle diameter) and are not readily sintered by heating. The present invention has: a step in which an alkali and a solution including a carboxylic acid and a titanium (oxy)chloride are mixed, and the titanium (oxy)chloride is hydrolyzed by neutralization; and a step in which, after the hydrolysis by neutralization, the solution is heated to a temperature of 80° C. or more and 110° C. or less, and the titanium (oxy)chloride remaining in the solution is hydrolyzed by heating. It is thus possible to obtain titanium oxide particles that have a small degree of aggregation and a range of 1-35 for the ratio (D90/BET diameter) between the 90% cumulative mass particle size distribution diameter (D90) (nm) as measured by a dynamic light-scattering particle diameter distribution measurement device and the BET diameter (nm) as calculated from the specific surface area of the titanium oxide particles.

Titanium oxide particles and manufacturing method therefor

Provided are a titanium dioxide aqueous dispersion having high dispersibility and little aggregation or coarse particles, and a method for producing the same. The titanium dioxide aqueous dispersion contains titanium dioxide particles having a hydrophobic compound such as a higher fatty acid or a salt thereof on the surface, an aqueous dispersion medium, a nonionic surfactant having an HLB value of 10 or higher, and a basic compound such as an alkanolamine, and the pH is in the 8.5-13 range. The method for producing a titanium dioxide aqueous dispersion has a step for mixing the titanium dioxide particles having a hydrophobic compound on the surface, the aqueous dispersion medium, the nonionic surfactant having an HLB value of 10 or higher, and the basic compound to bring the pH of the aqueous dispersion into the 8.5-13 range.

Titanium dioxide aqueous dispersion and method for producing same

A dispersion comprising at least metallic copper particles with gelatin provided on the surface thereof, a polymeric dispersant, and an organic solvent. The dispersion is produced by reducing copper oxide in an aqueous solvent in the presence of gelatin having an amine number and an acid number wherein the difference (amine number&#x2212;acid number) is 0 or less, then subjecting the reaction solution to solid-liquid separation, and then mixing the resultant metallic copper particles with gelatin provided on the surface thereof and a polymeric dispersant having an amine number and an acid number wherein the difference (amine number&#x2212;acid number) is 0 to 50, into an organic solvent. The dispersion maintains dispersion stability of the metallic copper particles for a long time, is suitable for inkjet printing and spray coating and can be used to make microelectrodes and circuit wiring patterns.

Metallic copper dispersion, process for producing the metallic copper dispersion, electrode, wiring pattern, and coating film formed using the metallic copper dispersion, decorative article and antimicrobial article with the coating film formed thereon, and processes for producing the decorative article and the antimicrobial article

The present invention relates to two-component paint, which comprises: a first liquid comprising at least one colloidal metal solution which includes at least colloidal metal particles with a sulfur compound of low molecular weight on the particle surfaces and a dispersion medium, the solution containing not less than 1 wt. % of the colloidal metal particles and has a pH of 8-14, and a second liquid comprising at least a curable resin component.

Colloidal metal solution, process for producing the same and paint using the same

The present invention relates to a process for producing a colloidal metal solution, which comprises a first step of forming colloidal metal particles with a sulfur compound of low molecular weight on the particle surfaces in a solution, a second step of adjusting the solution to a pH of not more than 5, thereby aggregating the colloidal metal particles and recovering the colloidal metal particles by filtration, and a third step of dispersing the recovered colloidal metal particles into a dispersion medium at a pH of 8-14.

There is provided a process comprising mixing a divalent copper oxide with a reducing agent in the presence of a complexing agent and a protective colloid in a liquid medium to thereby produce copper microparticles without formation of a univalent copper oxide from the divalent copper oxide. Further, there is provided a process comprising reducing a divalent copper oxide in the presence of a complexing agent and a protective colloid, such as a protein, to thereby form metallic copper microparticles, adding a protective colloid scavenger, such as a protease, to thereby remove the protective colloid and effect agglomeration of metallic copper microparticles, and filtering the mixture by means of a pressure filter, a vacuum filter, a suction filter, etc.

Copper microparticle and process for producing the same

The present invention relates to a colloidal metal solution comprising colloidal metal particles with a sulfur compound of low molecular weight such as mercaptoacetic acid, mercaptopropionic acid, mercaptoethanol, etc. as a protective colloid on the particle surfaces and having a pH of 8-14. According to the present invention, a colloidal metal solution having a high concentration and a distinguished dispersion stability with a small amount of the protective colloid can be provided with a commercially and economically high advantage without any operation such as centrifuge, etc.

Colloidal metal solution, process for producing the same, and coating material containing the same

The organic solvent-based dispersion of conductive powders of the present invention comprises an organic solvent-based medium as a dispersion medium, conductive tin oxide powders coated with an organic metal coupling agent at the surface of tin oxide particles and a dispersant, and shows excellent dispersibility and high transparency. Therefore, the dispersion is useful for antistatic purpose of transparent substrates including the display surface of display devices, their surface protecting materials, films, etc.

Organic solvent based dispersion of conductive powder and conductive coating material

The invention provides a titanium oxide photocatalyst having an excellent photocatalytic property and comprising titanium oxide particles which have part or the whole of an iron compound contained therein and supported thereon. The invention further provides a titanium oxide photocatalyst comprising titanium oxide particles which are treated with a mineral acid and which have part or the whole of an iron compound contained therein and supported thereon. The invention still further provides a process for producing the titanium oxide photocatalyst. Utilizing the excellent photocatalytic property, materials which exert or may exert a harmful influence upon human bodies or living environment, such as organic halogen compounds, malodorous gases, oils, bacteria, fungi and algae can be rapidly and effectively removed.

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Yokkaichi, Japan

Masanori Tomonari