Sk Innovation Co., Ltd.

Sk Geo Centric Co., Ltd.

Ki Yup Kim

Hyuk Joo Kim

Yong Gyun Cho

Sung Ho Son

Myoung Lae Kim

Won Yeob Kim

Jun Tae Choi

Do Young Kim

Jun Haeng Lee

Sung Won Lee

Chol Ho Lee

Won Seok Jang

Yoo Seock Hwang

Joo Hyun Nam

Hyun Sik Yang

Ji Hae Park

Hyuk Jun Kim

Chul Soon Moon

Yu Hyun Kim

Ho Seung Lee

Jee Young Ahn

Provided are a biodegradable aliphatic-aromatic polyester copolymer having excellent hydrolysis resistance and high viscosity which has a carboxyl end group (CEG) content of 15 mg KOH/g or less, a ratio (Mz/Mn) of a z-average molecular weight (Mz) to a number average molecular weight (Mn) of 3 to 15, and a melt index (MI) of 5 g/10 min or less as measured under conditions of a temperature of 190° C. and a load of 2.16 kg in accordance with ASTM D 1238. A method of preparing a biodegradable aliphatic-aromatic polyester copolymer is provided, including adding a chain extender and an anti-hydrolysis agent to an aliphatic-aromatic polyester pre-copolymer over time, whereby a significant viscosity rise and improvement of hydrolysis resistance may be implemented simultaneously.

High-viscosity biodegradable aliphatic-aromatic polyester copolymer having excellent hydrolysis resistance and method of preparing the same

Provided is a cellulose acetate film used for optical compensation and, in particular, a cellulose acetate film having a low retardation value Rin the film thickness direction.

Cellulose acetate film

Disclosed is a casting belt used for manufacturing an optical film by means of a solvent casting process, in more detail, a casting belt for producing a transcendental wide width film which is used to produce a film in a gel state by casting a dope when manufacturing a film that is used for a polarizer of liquid crystal displays or optical compensation films.

Casting belt for producing transcendental wide width film

Provided are a cellulose acylate film used for optical compensation and additives used therefor and, more particularly, is a cellulose acylate film with mechanical physical properties, in particular, very improved modulus affecting film durability.

Cellulose acylate film

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Seoul, South Korea

Ki Yup Kim