| TOHO TITANIUM CO., LTD. Patent applications |
| Patent application number | Title | Published |
|---|
| 20120004378 | SOLID CATALYST COMPONENT AND CATALYST FOR POLYMERIZATION OF OLEFINS, AND PROCESS FOR PRODUCTION OF OLEFIN POLYMERS USING SAME - A solid catalyst component for olefin polymerization is produced by causing (a) a solid component that includes magnesium, titanium, a halogen, and an electron donor, (b) an aminosilane compound shown by the following general formula (1), and (c) at least one organosilicon compound selected from an organosilicon compound shown by the following general formula (2-A) and an organosilicon compound shown by the following general formula (2-B) to come in contact with each other. A polymer having high stereoregularity is produced in high yield while achieving a high melt flow rate due to hydrogen by polymerizing an olefin in the presence of a catalyst that includes the solid catalyst component. | 01-05-2012 |
| 20110269926 | SOLID CATALYST COMPONENT FOR OLEFIN POLYMERIZATION, MANUFACTURING METHOD, AND CATALYST AND OLEFIN POLYMER MANUFACTURING METHOD - A solid catalyst component for olefin polymerization includes a solid component obtained by causing a magnesium compound (a), a titanium halide compound (b), and an electron donor compound (c) to come in contact with each other, the titanium compound in an amount equivalent to a titanium content of 0.2 to 2.5 wt % in the solid catalyst component being washed away from the solid catalyst component by washing with heptane. A granular or spherical polymer that has high stereoregularity and a narrow particle size distribution can be obtained in high yield while suppressing production of a fine powder by polymerizing an olefin using a catalyst that includes the solid catalyst component. | 11-03-2011 |
| 20110158885 | HIGH PURITY CRYSTALLINE SILICON, HIGH PURITY SILICON TETRACHLORIDE AND PROCESSES FOR PRODUCING THE SAME - An object of the present invention is to provide more inexpensive high purity crystalline silicon which can satisfy not only a quality required to a raw material of silicon for a solar cell but also a part of a quality required to silicon for an up-to-date semiconductor and a production process for the same and provide high purity silicon tetrachloride used for production of high purity crystalline silicon and a production process for the same. The high purity crystalline silicon of the present invention has a boron content of 0.015 ppmw or less and a zinc content of 50 to 1000 ppbw. The production process for high purity crystalline silicon according to the present invention is characterized by that a silicon tetrachloride gas and a zinc gas are supplied to a vertical reactor to react them at 800 to 1200° C., whereby crude crystalline silicon is formed at a chip part of a silicon tetrachloride gas-supplying nozzle, and the crude crystalline silicon is grown downward from the chip part of the silicon tetrachloride gas-supplying nozzle; the grown crude crystalline silicon is discharged to an outside of the reactor, and the discharged crude crystalline silicon is subjected to acid treatment. | 06-30-2011 |
| 20110142742 | METHOD FOR PURIFICATION OF SILICON TETRACHLORIDE - An object of the present invention is to provide a method for purification of silicon tetrachloride which solves the problems of separating and removing organic chlorosilanes by distillation or adsorption. | 06-16-2011 |
| 20100190938 | CATALYST COMPONENT, CATALYST FOR OLEFIN POLYMERIZATION, AND PROCESS FOR PRODUCING OLEFIN POLYMER USING CATALYST - A polymer exhibiting high catalytic activity, good hydrogen response and high three-dimensional regularity can be obtained with high yield by polymerizing an olefin in the presence of a catalyst for olefin polymerization which is composed of a solid catalyst component (A) containing magnesium, titanium, a halogen and an electron-donating compound, an organic aluminum compound (B) represented by the following general formula: R | 07-29-2010 |
| 20100028253 | TITANIUM DIOXIDE POWDER AND METHOD FOR PRODUCTION THEREOF - A titanium dioxide powder which has a rutile content of 80% or more and a BET surface area of 30 m | 02-04-2010 |
