Cheil Industries Inc.

Sung Sig Min

Han Su Lee

Bong Jae Lee

Byung Choon Lee

Kyung Tae Kim

Byeong Do Lee

Jong Cheol Lim

Kyoung Tae Kim

Kyung Hoon Seo

A polymer composition includes a polycarbonate resin, a syndiotactic polystyrene resin, a core-shell graft copolymer, and a phosphate ester compound. In some embodiments, the compositions have one or more of good impact strength, Falling Dart impact strength, chemical resistance, and flowability.

Polycarbonate resin compositions

Disclosed is a silicone impact modifier with a high refractive index. The silicone impact modifier can include (A) a rubber core including (a) an organosiloxane cross-linked (co)polymer with a particle size of about 50 to about 400 nm and (a) an alkylacrylate-styrenic aromatic compound cross-linked copolymer; and (B) a plastic shell including a vinyl (co)polymer. The refractive index of the silicone impact modifier of the present invention can be about 1.49 to about 1.59.

Silicone impact modifier with high refractive index and method for preparing the same

A polycarbonate composition and its use as a molded article and as housing or a part of electronic device are disclosed. The polycarbonate composition includes a polycarbonate resin, a liquid crystalline polymer resin, a core-shell grafted copolymer and a low molecular weight polyolefin. The composition has an impact strength of at least about 68 kg&#xb7;cm/cm when a specimen of the composition is subject to a chemical treatment and the chemically treated specimen is tested according to the standard ASTM D256 (&#x215b;&#x2033; notched). The composition has an impact resistance of exhibiting substantially no cracking when a specimen of the composition is subject to a chemical treatment and the chemically treated specimen is tested at 0.6 m according to the standard ASTM D3029. The chemical treatment includes submerging the specimen in paint thinner for 20 seconds and thereafter drying the specimen at 70&#xb0; C. for 5 minutes. Further, the composition has a fatigue resistance of at least about 130,000 when a specimen of the composition is tested at 4000 psi at 5 times per second according to the standard ASTM D638.

Polycarbonate resin composition and molded articles with the same

Disclosed herein is a flame retardant polycarbonate resin composition having high heat resistance and good impact resistance. The flame retardant polycarbonate composition is prepared by incorporating into a polycarbonate resin a silicon-based core-shell graft copolymer, in which a vinyl monomer is graft polymerized onto a rubber comprising about 20 to about 95% by weight of silicon, and optionally a phosphoric acid ester compound. The present invention can accordingly provide superior flame retardance while maintaining good impact resistance, high flowability and high heat resistance.

Flame retardant polycarbonate resin composition having good impact, high heat resistance

The polycarbonate resin composition having good fatigue strength according to the present invention comprises (A) 80 to 98 parts by weight of a polycarbonate resin, (B) 0.1 to 10 parts by weight of a thermotropic aromatic liquid crystalline polymer resin and (C) 1 to 20 parts by weight of a core-shell grafted copolymer.

Polycarbonate resin composition and molded articles of the same

Disclosed herein is an impact modifier for a polymer composition and a method of preparing the same. The impact modifier includes a core comprising a polyorganosiloxane, an acrylate polymer and a styrenic polymer; and a shell generally surrounding the core, the shell comprising a polymer attached to the core. The method includes providing a silicone rubber particle; adding a polymerizable styrenic compound into the silicone rubber particle; polymerizing the polymerizable styrenic compound within the particle to provide a styrenic polymer; adding a polymerizable acrylic compound into the silicone rubber particle; polymerizing the polymerizable acrylic compound within the silicone rubber particle to provide an acrylate polymer; and grafting a polymerizable compound onto the silicone rubber particle to provide a shell substantially surrounding the silicone rubber particle comprising the styrenic polymer and the acrylate polymer.

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Seoul, South Korea

Sung Sig Min