Nissan Chemical Industries Limited

Hitachi Powdered Metals Co., Ltd.

Nissan Motor Company Limited

Hoya Corporation

Other

Honda Giken Kogyo Kabushiki Kaisha

Keitaro Suzuki

Yoshitane Watanabe

Yoshinari Koyama

Motoko Iijima

Yutaka Ikenoue

Masayuki Teranishi

Masuo Shindo

Akira Fujiki

Hiroyuki Endo

Tetsunori Matsukura

Yoshiteru Yasuda

Eiichi Yajima

Osamu Tanegashima

Ichiro Tanimoto

Kouji Shishido

Takeshi Takahashi

Makoto Abe

Makoto Tsuji

Kei Ishii

Hideo Urata

Yoshimasa Aoki

Koji Koishikawa

Motoko Asada

Shoichi Kaneko

Makoto Kawashima

Eiji Okumura

Susumu Suda

Takanobu Itoh

Teruyuki Koshi

Mutsuko Suzuki

Hiroyuki Endoh

The invention relates to a process for producing diantimony pentoxide having a high oxidation purity. A process for producing an aqueous sol of diantimony pentoxide, which comprises mixing diantimony trioxide (SbO) and an aqueous hydrogen peroxide solution in an aqueous medium, and after the temperature has reached from 50 to 80&#xb0; C., reacting the diantimony trioxide with the aqueous hydrogen peroxide solution while keeping the reaction temperature at a level not higher by at least 10&#xb0; C. than a desired set temperature in the temperature range, to thereby obtain a sol having dispersed in the aqueous medium diantimony pentoxide particles which have a primary particle size of from 2 to 50 nm and which have a diantimony trioxide/diantimony pentoxide weight ratio of not higher than 5 wt %.

Process for producing antimony pentaoxide

A sol having high oxidation purity and containing diantimony pentoxide particles having a primary particle size of from 2 to 50 nm and a SbO/SbOweight ratio of at most 4 wt % is prepared by reacting a diantimony trioxide with an aqueous hydrogen peroxide solution in the presence of tunastate or molybdate.

Diantimony pentoxide sol and method for its preparation

A stable modified metal oxide sol which contains from 2 to 50 wt %, as calculated as metal oxides, of particles (c) comprising colloidal particles (a) of a metal oxide having primary particle diameters of from 2 to 60 nm, as nuclei, and a coating material (b) consisting of colloidal particles of an acidic oxide coated on the surface of the particles (a), and which has primary particle diameters of from 2 to 100 nm.

Modified metal oxide sol, coating compositions and optical element

Hard coating material and film comprising the same

The present invention provides a process for producing a diantimony pentoxide sol, characterized in that a diantimony pentoxide sol having a particle size of 5 to 30 nm is used as a nuclear sol and the sol is grown to an arbitrary particle size, preferably a particle size of 40 to 300 nm. The process comprises adding a hydrogen peroxide solution and diantimony trioxide into a sol comprising diantimony pentoxide particles as a raw material, and coating the diantimony pentoxide particles with a resulting antimony compound, preferably diantimony pentoxide. In the process, the coating is preferably carried out in such a manner that a particle size of particles in a sol as a raw material increases by a factor of 1.3 to 60.

Process for producing diantimony pentoxide sol

Modified metal oxide sol, coating composition and optical element

The present invention provides a novel modified stannic oxide&mdash;zirconium oxide complex sol and a preparation method thereof, particularly a stable sol which contains 2-50% by weight of total metal oxides comprising modified colloidal particles of a stannic oxide&mdash;zirconium oxide complex having a particle diameter having 4.5-60 nm, wherein the particles are formed by coating complex colloidal particles of a stannic oxide&mdash;zirconium oxide having a bonded structure of stannic oxide colloidal particles and zirconium oxide colloidal particles at a ZrO /SnO ratio of 0.02-1.0 based on weights of these oxides and having a particle diameter of 4-50 nm as nuclei, with colloidal particles of a tungsten oxide&mdash;stannic oxide&mdash;silicon dioxide complex having such a constitution that a WO /SnO weight ratio is 0.1-100, that a SiO /SnO weight ratio is 0.1-100 and having a particle diameter of 2-7 nm, and preparation method thereof.

Modified stannic oxide&mdash;zirconium oxide complex sol and preparation method thereof

An optical element having, on an optical substrate, a cured film formed of a coating agent containing (A) modified stannic oxide-zirconium oxide composite colloid particles as prepared by coating at least a part of the surfaces of stannic oxide-zirconium oxide composite colloid particles with stannic oxide-tungsten oxide-silicon oxide composite colloid particles, and (B) an organosilicon compound.

Optical element having cured film

The present invention relates to a method for producing titanium oxide (TiO,)-tin oxide (SnO,) composite sol, a titanium oxide (TiO,)-zirconium oxide (ZrO,)-tin oxide (SnO,) composite sol, and a titanium oxide (TiO,)-cerium oxide (CeO,)-tin oxide (SnO,) composite sol. Further, the present invention relates to a coating composition containing any of the above-mentioned composite sols for forming coating films that are excellent in marring resistance, surface hardness, wearing resistance, transparency, heat resistance, light-resistant, weatherability, or water resistance on optical elements such as lenses for glasses and cameras, automotive windowpane, or optical filters attached to liquid-crystal displays, plasma displays, etc. and to optical elements having a cured film of the coating composition on the surfaces.

Method for producing composite sol, coating composition, and optical element

A sol comprising silica-magnesium fluoride hydrate composite colloidal particles used in an anti-reflection coating material for forming an anti-reflection coating and a process for its preparation are provided. A sol comprising silica-magnesium fluoride hydrate composite colloidal particles having a ratio of silica to magnesium fluoride hydrate MgF,.nH,O, n being in the range between 0.25 and 0.5, in terms of a SiO,/MgF,weight ratio of from 0.01 to 5 and a primary particle size of 5 to 50 nm. A process for the preparation of an aqueous sol comprising silica-magnesium fluoride hydrate composite colloidal particles which comprises the steps of adding an aqueous fluoride solution to a mixture liquid of a silica sol and an aqueous magnesium salt solution to produce a slurry of an agglomerate comprising silica-magnesium fluoride hydrate composite colloidal particles and removing the salts formed as by-products. A process for the preparation of an organosol further comprising the step of replacing water in the aqueous sol with an organic solvent.

Silica-magnesium fluoride hydrate composite sols and process for their preparation

Melamine-melam-melem salt of a polyphosphoric acid and process for its

1,3,5-triazine derivative salts of polyacids comprising phosphorus,

A sol having dispersed in a liquid medium particles of a hydrated zinc stannate having a primary particle diameter of from 2 to 200 nm and represented by the formula xZnO.multidot.ySnO.sub.2 .multidot.zH.sub.2 O wherein the molar ratio of x:y:z is 1:0.83 to 1.43:1.00 to 5.00.

Hydrated zinc stannate sols, coating compositions and optical elements

Melamine polymetaphosphate and process for its production

A sol having dispersed in a liquid medium particles of a hydrated zinc stannate having a primary particle diameter of from 2 to 200 nm and represented by the formula xZnO.ySnO.sub.2.zH.sub.2 O wherein the molar ratio of x:y:z is 1:0.83 to 1.43:1.00 to 5.00.

Growing community of inventors

Funabashi, Japan

Keitaro Suzuki