Cheil Industries Inc.

Samsung Electronics Co., Ltd.

Woo Joong Kim

Hyung Jun Kim

Won Cheol Jung

Kyu Yeol In

Moon Yeon Lee

Myung Sup Jung

Jong Hoon Won

Man Suk Kim

Beom Jun Joo

Seon Ae Lee

Byun Kun Lee

Jae Hyun Kim

Seung Shik Shin

Jin Hwan Choi

Hee Kyung Kim

Kyoung Ah Oh

Hyeon Ho Choi

Myoung Jun Kim

An optical film including a polymer including a repeating unit A including a repeating unit represented by the following Chemical Formulas 1 to 3, or a combination thereof; and a repeating unit B derived from a monomer having an unsaturated bond copolymerizable with the repeating unit A, wherein the optical film has a short wavelength dispersion of an in-plane phase-difference value (R) (450 nm/550 nm) ranging from about 0.81 to about 1.20, and a long wavelength dispersion of an in-plane phase-difference value (R) (650 nm/550 nm) ranging from about 0.90 to about 1.18: wherein, in Chemical Formulas 1 to 3, the variables Rto Rare defined herein.

Optical film and display device including same

An optical compensation film includes: a first layer having positive birefringence; a second layer on the first layer and having negative birefringence; and a third layer on the second layer and having positive birefringence. A retardation value of the optical compensation film for incident light having a wavelength of about 550 nm is about 135 nm to about 145 nm, and a ratio of a thickness of the first layer or of the third layer to a thickness of the second layer is about 1.1 to 2.2.

Optical compensation film

The present invention provides a phosphonate based compound (B) and a flame resistant thermoplastic resin composition including a thermoplastic resin (A) and the phosphonate based compound (B).

Phosphonate based compound and flame retardant styrenic resin composition including the same

The present invention provides a phosphonate based compound represented by the following Chemical Formula 1 and a flameproof thermoplastic resin composition comprising (A) a thermoplastic resin and (B) a phosphonate based compound represented by the following Chemical Formula 1. The flameproof thermoplastic resin composition can exhibit good flame retardancy and impact strength. Further, the composition does not include a halogenated flame retardant and thus can provide environmental and safety benefits. 

Phosphonate based compound and flameproof thermoplastic resin composition including the same

The present invention provides phosphonate compounds represented by Chemical Formula 1. In addition, the invention provides flame retardant styrene resin compositions comprising (A) styrene resin, (B) polyphenylene ether resin, and (C) the phosphonate compound. The flame retardant styrene resin compositions according to the invention: can provide protection against fire, exhibit improved impact strength, and can be environment-friendly.

Phosphonate compound and flame retardant styrenic resin composition including the same

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Uiwang-si, South Korea

Woo Joong Kim