Seongnam, South Korea
Seongnam, South Korea

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A method for preparing a transdermal absorption composition includes mixing rotigotine and an antioxidant at a weight ratio of 1:0.0001 to 0.1. A transdermal therapeutic system includes a substrate and a drug-containing adhesive layer disposed on the substrate and including an antioxidant at a weight ratio of 1:0.0001 to 0.1. The method and system of the present invention suppress the crystallization of rotigotine as well as the generation of related substances, thereby increasing the long-term storage stability of a therapeutic product containing rotigotine or related substances.


Patent
SK Chemicals Co. | Date: 2017-05-24

The present invention relates to a polyester resin composition capable of having an excellent shrinkage rate, being heat-shrunk at a low temperature, and improving adhesion properties, without impairing insulation properties in a state of heat-shrinkable films, and a method for preparing the same. The present polyester resin composition comprises: a copolymerized polyester resin including a dicarboxylic acid-derived residue including a residue derived from an aromatic dicarboxylic acid; and a diol-derived residue including a residue derived from 4-(hydroxymethyl)cyclohexylmethyl 4-(hydroxymethyl)cyclohexane carboxylate, and a residue derived from 4,4-(oxybis(methylene)bis) cyclohexane methanol, an alkali metal compound, and an alkaline earth metal compound, wherein the alkali metal compound and the alkaline earth metal compound are contained in an amount that the content ratio of the alkali metal element/the alkaline earth metal element derived therefrom is 0.01 to 1.


The present invention relates to a method for preparing poly(trimethylene terephthalate). According to the present invention, it is possible to prepare poly(trimethylene terephthalate) containing low levels of toxic by-products such as acrolein without separate additives.


Patent
SK Chemicals Co., Hyundai Motor Company and Kia Motors | Date: 2016-12-14

Disclosed is a resin composition for forming a steering wheel remote control bezel. The resin composition comprises: an amount of about 40 to 50 wt% of a polyester copolymer including a dicarboxylic acid component residue including terephthalic acid and a diol component residue including dianhydrohexitol; an amount of about 10 to 20 wt% of at least one copolymer selected from a group consisting of unsaturated nitrile-diene-based rubber-aromatic vinyl grafted copolymers and alkylmethacrylate-diene-based rubber-aromatic vinyl grafted copolymers; and an amount of about 40 to 50 wt% of polycarbonate. Further, an amount of 0.1 to 0.5 parts by weight of a phosphate base antioxidant-based on 100 parts by weight of the resin composition is further added to the resin composition.


Patent
SK Chemicals Co. | Date: 2016-07-13

The present invention relates to a polymer resin composition including: one or more copolymers selected from the group consisting of an unsaturated nitrile-diene-based rubber-aromatic vinyl graft copolymer, an alkyl methacrylate-diene-based rubber-aromatic vinyl graft copolymer, and an alkyl methacrylate-silicone/alkyl acrylate graft copolymer; a polyester resin; a polycarbonate resin; and a block copolymer including two or more alkylene-based repeating units having 2 to 10 carbon atoms and an aromatic vinyl-based repeating unit, and a molded article thereof. According to the present invention, a polymer resin composition providing an environment-friendly biomass-containing synthetic resin representing improved chemical resistance, and a polymer resin molded article obtained using the same may be provided.


The present invention relates to a method for separating volatile substances, particularly iodine, diiodised aromatic compounds and/or mixtures thereof, from material mixtures containing said compounds. The invention further relates to a device for producing polyarylene sulphides, by means of which volatile substances, particularly iodine and diiodised aromatic compounds, can be separated from the polymers.


The present invention relates to a method for separating volatile substances, particularly iodine, diiodised aromatic compounds and/or mixtures thereof, from material mixtures containing said compounds. The invention further relates to a device for producing polyarylene sulphides, by means of which volatile substances, particularly iodine and diiodised aromatic compounds, can be separated from the polymers.


Patent
Sk Chemicals Co. | Date: 2016-10-05

The present invention relates to a method for preparing polymeric microspheres to improve the drug encapsulating efficiency and, more specifically, to a method for preparing polymeric microspheres, the method comprising the steps of: preparing an internal water phase (w1) and an oil phase (0); mixing the internal water phase and the oil phase to prepare a W1/0 emulsion, followed by cooling; mixing the W1/0 emulsion with an external water phase (W2) to prepare a W1/0/W2 emulsion; and drying the prepared W1/0/W2 emulsion, followed by collection. The method of the present invention can increase the drug encapsulating efficiency and manufacture polymeric microspheres having high drug contents through a procedure of maintaining the step of solidifying the oil phase at a particular temperature for a particular period of time, and thus the method of the present invention is effective in the preparation of sustained release-type drugs.


Patent
SK Chemicals Co. | Date: 2016-02-10

The present invention relates to a polylactic acid resin composition having eco-friendly properties, which can be effectively used as a packaging material due to improved flexibility and moisture resistance, as well as superior general properties such as mechanical properties, transparency, heat resistance, an anti-blocking property, and film processability. The inventive polylactic acid resin composition comprises a polylactic acid resin comprising a hard segment comprising a polylactic acid repeating unit and a soft segment comprising a polyolefin-based polyol repeating unit in which polyolefin-based polyol structural units are linked in a linear or branched manner via a urethane bond or an ester bond, wherein the organic carbon content (%C_(bio)) of biomass-based carbon, as defined in Equation 1, is at least 60 wt%; and an antioxidant.


Patent
SK Chemicals Co. | Date: 2016-06-01

Disclosed is a method for preparing fatty acid alkyl ester for bio-diesel fuels by reacting a raw material containing fat with water to prepare fatty acid, and then reacting the prepared fatty acid with alcohol. The method for preparing fatty acid alkyl ester for bio-diesel fuels includes the steps of: preparing fatty acid and glycerin by an hydrolysis reaction of a raw material containing fat and water at the temperature of 200 to 280C and the pressure of 30 to 80 bar; carrying out a phase separation of the fatty acid and the glycerin; and carrying out an esterification reaction of the separated fatty acid and alcohol at the temperature of 200 to 350C and the pressure of atmospheric pressure to 35 bar.

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