Lotte Advanced Materials Co., Ltd.

Lotte Chemical Corporation

Chan Moo Park

Sang Hyun Hong

Jong Cheol Lim

Min Soo Lee

Tae Gon Kang

Yoo Jin Jung

Sang Hwa Lee

Yeong Deuk Seo

Bong Jae Lee

Yang Il Kim

Young Ho Park

Tae Soo Kim

In Geol Baek

Mi Sung Kang

A thermoplastic resin composition includes: a polyester resin; a white pigment; a core-shell structured impact modifier; and a modified polyolefin resin. Exemplary compositions include polycyclohexylenedimethylene terephthalate (PCT) resin; titanium oxide; a core-shell structured impact modifier obtained by grafting methyl (meth)acrylate to the polydimethylsiloxane rubber core; and an ethylene-methacrylate copolymer. The thermoplastic resin composition is usable for the production of molded article as a reflector or reflector cup for a LED (light-emitting diode) that maintains reflectance at elevated temperature.

Thermoplastic resin composition having excellent reflectivity

A polyester resin composition includes: (A) polycyclohexylenedimethylene terephthalate (PCT) resin which is a polymer of terephthalic acid and cyclohexanedimethanol, wherein the cyclohexanedimethanol has a trans/cis isomer ratio of about 2.3 or more; (B) a white pigment, wherein the white pigment is titanium dioxide; and (C) inorganic fillers, wherein the inorganic fillers are glass fibers. A molded article formed from the polyester resin composition can exhibit improved mechanical properties and moldability, and thus can be suitable for light emitting diode (LED) reflectors.

Polyester resin composition having improved mechanical properties and moldability

The present invention can provide a thermoplastic resin composition which contains (A) a polyester resin, (B) a white pigment, and (C) a silicon-containing graft copolymer, and thus has excellent light efficiency, discoloration resistance, and light stability, without degrading shock resistance and molding processability.

Thermoplastic resin composition having excellent shock resistance and light resistance

A thermoplastic resin composition includes: a polyester resin; a white pigment; a core-shell structured impact modifier; and a modified polyolefin resin. Exemplary compositions include polycyclohexylenedimethylene terephthalate; titanium oxide; a core-shell structured impact modifier wherein the core includes a silicon and/or acrylic compound and the shell includes an acrylic compound; and a copolymer of ethylene and an alkyl (meth)acrylate comonomer. The thermoplastic resin composition and a molded article formed from the same can exhibit excellent properties in terms of reflectance, reflectance maintenance at high temperature, and/or flexural strength.

A polyester resin composition and a molded article produced using the same. The polyester resin composition includes: (A) two polyester resins including an aliphatic ring structure and having different trans/cis isomer ratios in the aliphatic ring; (B) a white pigment; and (C) an inorganic filler, wherein the polyester resin composition has a crystallization temperature (Tc) of about 230&#xb0; C. to about 250&#xb0; C., as measured by differential scanning calorimetry (DSC) while cooling the resin composition at a cooling rate of &#x2212;100&#xb0; C./min.

Polyester resin composition with excellent impact resistance and light reliability and molded article using the same

Disclosed herein is a polyester resin composition and a molded article manufactured therefrom. The polyester resin composition includes: (A) a polyester resin; (B) a white pigment; and (C) a reflectance retention agent comprising an inorganic compound having a pH of about 7.5 to about 14.

Polyester resin composition and molded article manufactured therefrom

A polyester resin composition includes: (A) a polyester resin which includes a polymer of a dicarboxylic acid component including an aromatic dicarboxylic acid, for example but not limited to terephthalic acid, and a diol component including an alicyclic diol, for example but not limited to cyclohexanedimethanol, having a trans/cis isomer ratio of about 2.3 or more; (B) a white pigment; and (C) inorganic fillers. A molded article formed from the polyester resin composition can exhibit improved mechanical properties and moldability, and thus can be suitable for light emitting diode (LED) reflectors.

A thermoplastic resin composition and a molded article produced using the same. The thermoplastic resin composition includes: a polyester resin comprising a repeat unit represented by Formula 1; a white pigment; and glass fillers comprising glass fibers having a circular cross-section and an average sectional diameter of about 6 &#x3bc;m to about 8 &#x3bc;m and flat glass fibers having a sectional aspect ratio of about 1.5 to about 8, wherein a weight ratio of the glass fibers to the flat glass fibers (circular shape:flat shape) ranges from about 1:0.1 to about 1:6,  wherein Ar is a Cto Carylene group; Rand Rare the same or different and are each independently a Cto Clinear alkylene group; and Ris a Cto Ccyclic alkylene group. The thermoplastic resin composition and the molded article produced using the same can exhibit excellent reflectance, impact resistance, stiffness, and balance therebetween.

Thermoplastic resin composition and article comprising the same

A thermoplastic resin composition that can have high reflectance and light efficiency and excellent discoloration resistance even at high temperature and high humidity conditions over a long period of time includes (A) a polyester resin; (B) a white pigment; and (C) a sodium phosphate salt.

Thermoplastic resin composition having excellent light stability at high temperature

A polyester resin composition and a molded article produced using the same. The polyester resin composition includes: (A) two polyester resins including an aliphatic ring structure and having different trans/cis isomer ratios in the aliphatic ring; (B) a white pigment; and (C) an inorganic filler, wherein the polyester resin composition has a crystallization temperature (Tc) of about 230&#xb0; C. to about 250&#xb0; C., as measured by differential scanning calorimetry (DSC) while cooling the resin composition at a cooling rate of &#x2212;100&#xb0; C./min. Exemplary compositions include a first poly(1,4-cyclohexylene dimethylene terephthalate) and a second poly(1,4-cyclohexylene dimethylene terephthalate) having different trans/cis isomer ratios in the cyclohexylene rings thereof, titanium oxide, glass fiber, and wollastonite.

A polyester resin composition comprises: (A) a first polyester resin having a melting temperature of greater than about 285&#xb0; C.; (B) a second polyester resin having a melting temperature of less than or equal to about 285&#xb0; C.; (C) a white pigment; and (D) an inorganic filler. The polyester resin composition may exhibit improved mechanical properties and discoloration resistance and can be used in a molded article, for example, as a LED reflector.

Polyester resin composition having improved mechanical properties and anti-discoloration

The present invention relates to a polyester-based thermoplastic resin composition comprising (A) a polyester resin, (B) a reactive polysiloxane and (C) a white pigment, having remarkable photostability, discoloration resistance and reflectance, thermal resistance, durability and mechanical strength, and capable of remarkably improving impact strength.

Thermoplastic resin composition with remarkable discoloration resistance and impact resistance

A thermoplastic resin composition includes (A) a polyester resin, (B) inorganic fillers, and (C) a white pigment, wherein at least one of the (B) inorganic fillers and the (C) white pigment is subjected to surface treatment with a silicone compound, and silicon is present in an amount of about 0.3 wt % to about 2 wt % based on the total weight of (A), (B), and (C).

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Uiwang-si, South Korea

Chan Moo Park