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Fukui, Japan

Shin-Etsu Chemical Co., Ltd. is the largest chemical company in Japan, ranked No. 9 in Forbes Global 2000 for chemical sector. Shin-Etsu has the largest global market share for polyvinyl chloride, semiconductor silicon, and photomask substrates.The company was named one of Thomson Reuters Top 100 Global Innovators in 2011, 2012, 2013 and 2014.“Shin-Etsu” in the company's name derives from Shin'etsu Region, where the company established the first chemical plant as Shin-Etsu Nitrogen Fertilizer in 1926, though the company today is headquartered in Tokyo and has its manufacturing locations in 14 countries worldwide. Wikipedia.


An object of the present invention is to provide a method for efficiently and highly selectively preparing a composition comprising perfluoropolyether having a hydroxyl group at one terminal at a higher ratio. The present invention provides a method for increasing a ratio of perfluoropolyether having a hydroxyl group at one terminal, relative to a total amount of the perfluoropolyether having a hydroxyl group at one terminal and perfluoropolyether having hydroxyl groups at both terminals in a composition comprising these perfluoropolyethers, wherein the method comprises a step of subjecting the composition to chromatography in which a moving phase is supercritical or subcritical state carbon dioxide of the specific temperature and the specific pressure, and a stationary phase is silica gel to thereby collect a fraction containing the perfluoropolyether having a hydroxyl group at one terminal at a higher ratio. Further, present invention provides for increasing a ratio of perfluoropolyether having a hydroxyl group at one terminal, relative to a total amount of the perfluoropolyether having a hydroxyl group at one terminal, perfluoropolyether having hydroxyl groups at both terminals and perfluoropolyether having no hydroxyl group at any terminal perfluoropolyether, in a composition comprising these perfluoropolyethers, wherein the method comprises a step of subjecting the composition to chromatography in which a moving phase is supercritical or subcritical state carbon dioxide of the specific temperature and the specific pressure, and a stationary phase is silica gel to thereby collect a fraction containing the perfluoropolyether having a hydroxyl group at one terminal at a higher ratio.


Patent
Shin - Etsu Chemical Co. | Date: 2015-10-29

A silicone composite particle composed of a silicone rubber particle and a polyorganosilsesquioxane, wherein the silicone rubber particle has plural dents on its surface and the polyorganosilsesquioxane adheres to the surface of the silicone rubber particle. Also, a method for preparing the silicone composite particle, which includes steps of subjecting organotrialkoxysilane to a hydrolysis and subsequent condensation in the presence of water, an alkaline substance and a silicone rubber particle containing therein a liquid to thereby have a resultant polyorganosilsesquioxane adhered to the surface of the silicone rubber particle, and subsequently removing the liquid.


A silicone structure-bearing polymer having a crosslinking group within the molecule, containing an isocyanurate structure bonded within the molecule, and having a Mw of 3,000-500,000 is provided. The polymer overcomes the stripping problem that a coating is stripped from metal wirings of Cu or Al, electrodes, and SiN substrates.


Patent
Shin - Etsu Chemical Co. | Date: 2015-07-20

A positive resist composition is provided comprising a polymer having an acid labile group and an acid generator bound to its backbone, in admixture with an onium salt having a specific cation structure capable of generating sulfonic acid having a molecular weight of at least 540. The composition is effective for suppressing acid diffusion, has high resolution, and forms a pattern of satisfactory profile and minimal edge roughness after exposure and development.


The present invention provides a negative electrode material for a lithium-ion secondary battery, the negative electrode material comprising silicon active material particles containing silicon and nitrogen, the silicon active material particles being capable of occluding and emitting lithium ions, wherein an amount of the nitrogen contained in each silicon active material particle is in the range from 100 ppm to 50,000 ppm, a negative electrode and lithium-ion secondary battery using the material, and a method of producing the material. The negative electrode material is suitable for a lithium-ion secondary battery negative electrode that has high first charge and discharge efficiency and excellent cycle performance and makes the best use of high battery capacity and low volume expansion rate of a silicon material such as a silicon oxide material.

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