Sk Innovation Co., Ltd.

Silicon Works Co., Ltd.

Sk Ie Technology Co., Ltd.

Lg Chem, Ltd

Sk Global Chemical Co., Ltd.

Jong Chan Kim

Hyo Seung Park

Hee Jin Lee

Yong Ju Seon

Han Sol Lee

Kyu Ho Kim

Jong Ho Lim

Heung Lyeol Lee

Ki Suk Cho

Seung Jun Choi

Deog Soo Kim

Ju Pyo Hong

Kwang Kuk Lee

Jin Su Ham

Young Ho Seo

So Young Lee

Joo Hyun Lee

Hyo Shin Kwak

Song-Taek Oh

Geun-Chang Chung

Young Hee Lim

Yeu Young Youn

Hyun Kyu Cho

Jin Hyung Park

Hyun Kuk Noh

Hye Sung Cho

Yongjin Bae

Il Gu Jung

Sin Kyu Kim

Seung Min Jeon

Je Ho Lee

Myung Jin Kim

Jeon Koo Lee

Jun Soo Son

Sanguck Lee

Jeong Hyun Noh

The present invention relates to a diamine, and a polymer and film produced using the same. Specifically, the diamine may be significantly effectively used as a monomer for producing a polyimide-based film that is colorless and transparent and has improved mechanical strength.

Diamine, polymer and film produced using the same

Provided are a polyimide precursor, a polyimide precursor solution, a polyimide film, a method for preparing the same, and a use thereof. According to an exemplary embodiment of the present invention, a polyimide film having excellent thermal resistance and satisfying transparency and a low coefficient of linear thermal expansion may be provided, and thus, may be usefully applied in a flexible display field requiring high dimensional stability and the like.

Polyimide precursor, polyimide precursor composition, polyimide film, method for preparing the same, and use thereof

Provided are a chromium catalyst precursor, an ethylene oligomerization catalyst including the same, and a method of preparing an ethylene oligomer using the same. More particularly, a chromium catalyst precursor which may oligomerize ethylene with high activity and high selectivity in spite of not using methylaluminoxane (MAO) or modified-methylaluminoxane (MMAO), an oligomerization catalyst including the same, and a method of preparing an ethylene oligomer using the same are provided.

Chromium catalyst precursor, ethylene oligomerization catalyst including the same, and method of preparing ethylene oligomer

A wireless battery management system, a manager node for the same, and a channel operating method, which operate a channel so as to stably support wireless communication in the wireless battery management system, are provided. The wireless battery management system includes a manager node and a monitor node. The manager node establishes a first network being a short-range wireless network by using at least one of a first channel and a second channel, and when a second network using the same communication channel and modulation method as a communication channel and a modulation method of the first network is detected, changing the first channel to a third channel and changing the second channel to a fourth channel.

Wireless battery management system, manager node for the same, and method of operating channel

The present disclosure relates to a wireless battery management system which ensures stability when obtaining battery data through wireless communication. The battery management system includes a manager node operating a primary channel and a secondary channel based on wireless communication and obtaining battery data from a monitor node by using the primary channel or the secondary channel and a monitor node connected to a battery module to collect battery data including one or more of a current, a voltage, a temperature, and self-diagnosis data of the battery module, transmit the collected battery data to the manager node through the primary channel, and when the transmission of the battery data through the primary channel fails, transmit the battery data to the manager node through the secondary channel.

Wireless battery management system, node for wireless communication, and method of transmitting data

Provided are a novel tetracarboxylic acid dianhydride and a method for preparing the same. According to an exemplary embodiment of the present invention, a novel tetracarboxylic acid dianhydride appropriate for providing a polyimide film having high transparency and thermal resistance and having excellent thermal dimensional stability due to a substrate of which the stress is not increased even with a heat treatment at a high temperature and a method for preparing the same may be provided.

Tetracarboxylic acid dianhydride and method for preparing the same

The present disclosure relates to a wireless battery management system, and more particularly, to a wireless battery management system, a node for wireless communication, and a method of transmitting data, which ensure stability and efficiency when obtaining battery data through wireless communication. A wireless battery management system includes a manager node obtaining battery data from a plurality of monitor nodes by using a first channel and a second channel which are communication channels based on wireless communication, a first monitor node collecting first battery data and transmitting the first battery data to the manager node through the first channel during a first dedicated slot, and a second monitor node collecting second battery data and transmitting the second battery data to the manager node through the second channel during the first dedicated slot.

The present invention provides a method enabling a quantitative analysis of a polymer by MALDI mass spectrometry, and a method for manufacturing a sample for MALDI mass spectrometry for a quantitative analysis of a polymer. To that end, the methods can increase reproducibility of a MALDI spectrum by making uniform the thickness of a sample affecting the pattern in a polymer MALDI spectrum. The sample according to the present invention is applicable also to a commercial MALDI-TOF instrument, and, thus, can quantitatively analyze a polymer in a more efficient and faster manner.

Method for quantitative analysis of polymer using MALDI mass spectrometry, and method for manufacturing sample for MALDI mass spectrometry for quantitative analysis of polymer

Provided is a method of preparing poly(alkylene carbonate) using a molecular weight regulator in a process of preparing a copolymer of carbon dioxide/epoxide using a novel complex synthesized from salen-type ligand including a quaternary ammonium salt as a catalyst. According to the present invention, even though the molecular weight regulator is used, an activity of the catalyst may be stably maintained, whereby the low molecular weight of poly(alkylene carbonate) having a desirable level may be effectively provided. In addition, it is expected that since the novel complex as the catalyst of the present invention has a simple structure as compared to the existing copolymerization catalyst, due to the economical preparation cost thereof, the novel complex may be effectively applied to a large-scale commercial process.

Method of preparing poly(alkylene carbonate) via copolymerization of carbon dioxide/epoxide in the presence of novel complex

Disclosed herein is a cathode active material including a lithium manganese oxide, in which the lithium manganese oxide has a spinel structure with a predetermined constitutional composition represented by Formula 1 described in the detailed description, wherein a conductive material is applied to the surface of lithium manganese oxide particles, so as to exhibit charge-discharge properties in the range of 2.5 to 3.5V as well as in the 4V region.

Cathode active material comprising lithium manganese oxide capable of providing excellent charge-discharge characteristics at 3V region as well as 4V region

The present invention is directed to a novel complex synthesized from a Salen-type ligand. The novel complex contains a quaternary ammonium salt. The present invention is also directed to a preparation method of a copolymer of carbon dioxide and epoxide using the complex synthesized from a Salen-type ligand as a catalyst.

Complex and preparation method of poly(alkylene carbonate) using the same

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Daejeon, South Korea

Jong Chan Kim