Abstract: A polylactic acid resin, a polylactic acid resin composition, a polylactic acid resin film, and a molded article are disclosed. The polylactic acid resin, which includes soft segments containing 0.5 wt % or more of at least one repeating unit selected from a polyester-based polyol repeating unit, a polylactone-based polyol repeating unit, or a polycarbonate-based polyol repeating unit, can lead to improvements in flexibility, transparency, tearing strength, processability, and the like while also providing excellent biodegradability.

Abstract: This polyester resin comprises a bis(2-hydroxyethyl)terephthalate monomer which is obtained by depolymerization of waste polyester and which has a diethylene glycol ester content adjusted to be a certain level or less. The polyester resin, despite of being a recycled resin, has the same level of quality as the original resin and thus can be used in manufacturing articles in various fields.

Abstract: The present disclosure relates to a polyester resin blend. The polyester resin blend exhibits excellent miscibility even if it contains recycled polyethylene terephthalate as well as virgin polyethylene terephthalate, and can provide molded articles with high transparency.

Abstract: A method, according to one embodiment, depolymerizes waste polyester by means of a multi-step reaction, wherein a latter reaction is carried out at a low temperature, and ion exchange, etc., is further carried out, thereby enabling the provision of high-purity and high-quality recycled bis(2-hydroxyethyl) terephthalate having reduced generation of diethylene glycol-derived impurities and oligomers.

Abstract: A copolymer polyester resin and a preparation method therefor are disclosed. The copolymer polyester resin contains a repeating unit derived from diol components and a repeating unit derived from a component of dicarboxylic acid or a derivative thereof, in which, by adjustment of the amounts of a first diol to a third diol or a fourth diol to a sixth diol, included in the diol components, impact strength and intrinsic viscosity are controlled to be within appropriate ranges without degrading transparency, and thus miscibility is excellent. Therefore, the copolymer polyester resin can exhibit excellent characteristics when utilized in various fields requiring high impact strength and high heat resistance, such as packaging materials such as food containers, and interior materials for vehicles.

Abstract: A copolymer polyester resin and an adhesive composition containing the copolymer polyester resin are disclosed. The copolymer polyester resin has a low glass transition temperature and improved hydrolysis resistance and solution storage stability. Therefore, the adhesive composition containing the copolymer polyester resin is superb in terms of hydrolysis resistance, solution storage stability, water heat resistance, and adhesiveness.

Abstract: A method for preparing a recycled raw material uses a waste copolyester. The method for preparing a recycled raw material includes (1) depolymerizing a waste copolyester to obtain a first reactant; (2) removing impurities present in the first reactant to obtain a second reactant; (3) distilling the second reactant to obtain a third reactant containing crude recycled bis-2-hydroxyethyl terephthalate and a fourth reactant containing a recycled diol-ester; and (4) mixing the third reactant with an aqueous solvent and recrystallizing it to obtain a fifth reactant containing recycled bis-2-hydroxyethyl terephthalate and a filtrate.

Abstract: A method of preparing 3(4),8(9)-bisformyltricyclo[5.2.1.02,6]decane is provided. According to the present invention, 3(4),8(9)-bisformyltricyclo[5.2.1.02,6]decane (TCDDA) may be prepared with a high conversion rate and purity without a separate catalyst recovery process.

Abstract: Provided are a tricyclodecane dimethanol composition, in which a ratio of isomers is controlled, and a preparation method thereof.

Abstract: A stretched polyester film and a method for preparing the stretched polyester film are disclosed. The stretched polyester film contains a polyester resin in which a diol component and a dicarboxylic acid component are polymerized, wherein the heat shrinkage rate of the film at 80° C. in the main shrinkage direction is 40% or more, and, upon a first thermal treatment and a second thermal treatment, a first melting temperature (Tm1) and a second melting temperature (Tm2) appear when the film is analyzed by differential scanning calorimetry (DSC). The stretched polyester film has excellent heat shrinkability, along with an increased efficiency of a recycling process of waste plastic containers.

Abstract: The present invention relates to a highly bio-based polycarbonate ester and a method for producing same. The highly bio-based polycarbonate ester has a bio-based carbon content of 80% or more since the highly bio-based polycarbonate ester is obtained by copolymerization of 1,4:3,6-dianhydrohexitol, which is a bio-based monomer derived from biomass, and 1,4-cyclohexanedicarboxylate and/or terephthalate, and therefore, the highly bio-based polycarbonate ester is not only human-friendly and environmentally friendly, but also advantageous in terms of biodegradability.

Abstract: A method for producing bis(2-hydroxyethyl)terephthalate is disclosed. The method includes recovering and reusing ethylene glycol with an acetate removed, after the glycolysis of a waste polyester. According to the method, an acetate is not concentrated even though ethylene glycol is reused in a continuous process, leading to bis(2-hydroxyethyl)terephthalate with excellent purity and quality.

Abstract: The present invention relates to a copolymerized saturated polyester resin and a coating composition containing same. Provided are a copolymerized saturated polyester resin and a coating composition having excellent hot water resistance, chemical resistance and processability when formed into a coating film, and showing excellent adhesiveness to a metal base, and thus particularly useful for coating a can and pre-coated metal (PCM).

Abstract: A polymerization raw material obtained by the depolymerization of waste polyester is disclosed. The polymerization raw material contains recycled bis(2-hydroxyethyl) terephthalate in which the contents of acetate-based ester compounds and diethylene glycol ester compounds are adjusted to specific levels. The polymerization raw material is excellent in purity and quality, and free from the problem that thermal resistance characteristics deteriorate in the polymerization of a polymer from the recycled monomer.

Abstract: A stretched polyester film and a method for preparing the stretched polyester film are disclosed. The stretched polyester film contains a polyester resin in which a diol component and a dicarboxylic acid component are polymerized, wherein the heat shrinkage rate of the film at 80° C. in the main shrinkage direction is 40% or more, and, upon a first thermal treatment and a second thermal treatment, a first melting temperature (Tm1) and a second melting temperature (Tm2) appear when the film is analyzed by differential scanning calorimetry (DSC). The stretched polyester film has excellent heat shrinkability, along with an increased efficiency of a recycling process of waste plastic containers.

Abstract: The present disclosure relates to a method for purifying bis-2-hydroxyethyl terephthalate with high purity and a polyester resin containing the same.

Abstract: The present disclosure relates to a polyester film and a preparation method of the same. Since the polyester film includes a resin layer formed from a mixture comprising a polyester resin, which includes a first diol moiety derived from isosorbide and a second diol moiety derived from cyclohexanedimethanol in a controlled ratio, and polyethylene terephthalate in a specific ratio, it is possible to exhibit improved heat resistance and adhesion with excellent light transmittance.

Abstract: A method for producing bis-2-hydroxyethyl terephthalate is disclosed. The method includes the steps of: (1) adding a waste polyester raw material into a co-extruder to obtain a co-extrudate; (2) adding the co-extrudate into a reactor with an agitation shaft and depolymerizing same to obtain a first reaction product; (3) adding the first reaction product into a first continuous stirred tank reactor and depolymerizing same to obtain a second reaction product; and (4) adding the second reaction product into a second continuous stirred tank reactor and depolymerizing same to obtain a third reaction product.

Abstract: A polyester resin comprising regenerated BHET according to an embodiment has excellent heat resistance characteristics since a diethylene glycol generated from the regenerated BHET to remain in the polyester resin is adjusted to a predetermined level or less, so that the polyester resin can be manufactured into a heat-shrinkable film.

Abstract: The present invention relates to a phosphine precursor for the preparation of a quantum dot, and a quantum dot prepared therefrom. Using the phosphine precursor for the preparation of a quantum dot of the present invention, a quantum dot with improved luminous efficiency and higher luminous color purity can be provided.