Sk Chemicals Co., Ltd.

Yu-Mi Chang

Ju-Sik Kang

Jeong Ho Park

Jeong-Ho Park

Nam-Choul Yang

Song Lee

Yong-Jun Shin

Suk Woon Jun

Jae-Kyun Park

Hee-Il Chae

The present invention relates to a method for preparing terephthalic acid, and terephthalic acid prepared therefrom. Specifically, according to one embodiment of the present invention, by including the step of hydrolyzing a compound prepared by depolymerizing a waste polyester using a specific hydrolysis catalyst, terephthalic acid can be prepared in an environmentally friendly manner, and high purity terephthalic acid can be provided.

Method for preparing terephthalic acid, and terephthalic acid prepared therefrom

This invention relates to a compound for an organic electroluminescent device and to an organic electroluminescent device including the same. This compound for an organic electroluminescent device has high thermal stability, high triplet energy and high hole transport capability, and the organic electroluminescent device including the same is improved in thermal stability and light emission efficiency. When this compound is used as a hole transport layer material, a triplet exciton of a phosphorescent light emitting material is confined, thus improving efficiency of the organic electroluminescent device.

Compound for organic eletroluminescent device and organic electroluminescent device including the same

This invention relates to a compound for an organic electroluminescent device and to an organic electroluminescent device including the same. This compound for an organic electroluminescent device including the same is improved in thermal stability and light emission efficiency. When this compound is used as a hole transport layer material, a triplet energy of a phosphorescent light emitting material is increased, thus improving the efficiency of the organic electroluminescent device.

Compound for organic electroluminescent device and organic electroluminescent device including the same

Disclosed are a novel diimmonium-based compound that has low light absorption in visible light region and has superior light absorption efficiency in near infrared region, and has superior durability and weatherability, and a near infrared absorption filter using the same. The diimmonium-based compound is represented by the formula 1 of claim

Diimmonium-based component and near infrared absorption filter using same

A novel copper phthalocyanine compound with low absorptivity in the visible light region and high absorptivity in the near-infrared light region, and a near-infrared absorption filter using the same are disclosed. The near-infrared absorption copper phthalocyanine compound is represented by the following Formula 1, wherein, A, A, A, A, A, A, Aand Aare independently OR, SRor a halogen atom, wherein at least four thereof are OR; A, A, A, A, A, A, Aand Aare independently OR, SR, NRRor a halogen atom, wherein at least two thereof are NRR, and at least four thereof are OR; R, R, Rand Rare independently an alkyl group oftocarbon atoms, an aryl group oftocarbon atoms, or an aralkyl group oftocarbon atoms.

Copper phthalocyanine compounds and near-infrared absorption filter using the same

A vanadium phthalocyanine compound with low absorptivity in the visible light region and high absorptivity in the near-infrared light region, and represented by the following Formula: 

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Gwangju-si, South Korea

Yu-Mi Chang