Patents Assigned to SK Chemicals Co., Ltd.
  • Patent number: 11535705
    Abstract: A method for preparing a polycarbonate ester includes feeding a monomer mixture containing (i) at least one compound selected from the group consisting of compounds of the following Formulae 1 and 3; (ii) a compound of the following Formula 2; and (iii) a 1,4:3,6-dianhydrohexitol to a polycondensation reactor and allowing the monomers and the 1,4:3,6-dianhydrohexitol to react to prepare the polycarbontate ester.
    Type: Grant
    Filed: January 24, 2019
    Date of Patent: December 27, 2022
    Assignee: SK CHEMICALS CO., LTD.
    Inventors: Kwang Sei Oh, Jong-In Lee
  • Publication number: 20220363820
    Abstract: A heat-resistant, bio-based polycarbonate ester prepared by melt polycondensation of 1,4:3,6-dianhydrohexitol and a carbonate or 1,4-cyclohexanedicarboxylate is disclosed. The heat-resistant, bio-based polycarbonate ester includes a repeat unit 1 of Formula 1, a repeat unit 2 of Formula 2, and a repeat unit 3 of Formula 3. The polycarbonate ester has excellent heat resistance, transparency, and processability. A method of producing the polycarbonate includes a step of melt polycondensation of 1,4:3,6-dianhydrohexitol and a carbonate or 1,4-cyclohexanedicarboxylate.
    Type: Application
    Filed: July 11, 2022
    Publication date: November 17, 2022
    Applicant: SK CHEMICALS CO., LTD.
    Inventor: Kwang Sei OH
  • Patent number: 11492444
    Abstract: The present invention relates to a polyester container. The polyester container is formed from a polyester resin containing a particular content of diol moieties derived from isosorbide and diethylene glycol, and thus can show high transparency in spite of a great wall thickness thereof.
    Type: Grant
    Filed: June 18, 2018
    Date of Patent: November 8, 2022
    Assignee: SK CHEMICALS CO., LTD.
    Inventors: Yoo Jin Lee, Sung-Gi Kim, Boo-Youn Lee
  • Patent number: 11479640
    Abstract: A bio-based polycarbonate ester resin is environment friendly by not containing a bisphenol, and exhibits excellent heat resistance, transparency, strength, hardness, dimensional stability and chemical resistance. Thus, the bio-based polycarbonate ester resin is suitable for use in an eyeglass frame. In addition, various colors may be painted and coated on during post-processing, a separate additive is not required during a molding process, and processing is undergone at a temperature lower than that for conventional plastic materials for an eyeglass frame, and thus manufacturing costs may be reduced.
    Type: Grant
    Filed: July 2, 2019
    Date of Patent: October 25, 2022
    Assignee: SK CHEMICALS CO., LTD.
    Inventors: Kwang Sei Oh, Jong-In Lee
  • Patent number: 11447603
    Abstract: The present invention relates to a polyester resin. The polyester resin contains a particular content of diol moieties, derived from isosorbide and diethylene glycol, and thus can provide a resin molded product exhibiting high transparency in spite of a large wall thickness thereof.
    Type: Grant
    Filed: May 29, 2018
    Date of Patent: September 20, 2022
    Assignee: SK Chemicals Co., Ltd.
    Inventors: Yoo Jin Lee, Sung-Gi Kim, Boo-Youn Lee
  • Patent number: 11421076
    Abstract: A heat-resistant, bio-based polycarbonate ester prepared by melt polycondensation of 1,4:3,6-dianhydrohexitol and a carbonate, 1,4-cyclohexanedicarboxylate, or a terephthalate is disclosed. The heat-resistant, bio-based polycarbonate ester includes a repeat unit 1 of Formula 1, a repeat unit 2 of Formula 2, and a repeat unit 3 of Formula 3: The polycarbonate ester has excellent heat resistance, transparency, and processability. A method of producing the polycarbonate includes a step of melt polycondensation of 1,4:3,6-dianhydrohexitol and a carbonate, 1,4-cyclohexanedicarboxylate, or a terephthalate.
    Type: Grant
    Filed: September 6, 2018
    Date of Patent: August 23, 2022
    Assignee: SK CHEMICALS CO., LTD.
    Inventor: Kwang Sei Oh
  • Patent number: 11401371
    Abstract: A copolymerized saturated polyester resin is formed by polycondensation of an acid component and an alcohol component. The acid component contains (a-1) 90 to 99% by mole of an aromatic dicarboxylic acid or a C1-2 alkyl ester thereof and (a-2) 0.5 to 2% by mole of a trifunctional or higher functional carboxylic acid or an anhydride thereof. The alcohol component contains (b-1) 45 to 80% by mole of an alicyclic polyhydric alcohol and (b-2) 20 to 55% by mole of an aliphatic polyhydric alcohol having a C1-3 alkyl side chain. A coating composition containing the copolymerized saturated polyester resin shows excellent corrosion resistance and chemical resistance. A coating film formed from the coating composition shows excellent processability and resin solubility, and is useful for coating a can and pre-coated metal.
    Type: Grant
    Filed: January 31, 2019
    Date of Patent: August 2, 2022
    Assignee: SK CHEMICALS CO., LTD.
    Inventors: Hyung-Gon Kim, Jong-Ki Sim, Soon-Ki Kim
  • Patent number: 11401372
    Abstract: A polyester resin and a coating composition containing the polyester resin are disclosed. The polyester resin includes a repeating unit obtained by copolymerizing (a) a divalent acid component and (b) a diol component containing (b-1) an isosorbide and (b-2) a cycloaliphatic diol, and has excellent heat resistance and solubility in a solvent. The cycloaliphatic diol may be one or more diol derivatives of a tricycle C7-14 alkane. A coating formed from a coating composition containing the polyester shows excellent heat resistance, hardness, chemical resistance, pollution resistance, and hydrolysis resistance.
    Type: Grant
    Filed: January 5, 2017
    Date of Patent: August 2, 2022
    Assignee: SK CHEMICALS CO., LTD.
    Inventors: Jong-ki Sim, Soon-Ki Kim
  • Patent number: 11396579
    Abstract: The present invention relates to a polyester film and a preparation method thereof. The polyester film is formed of a polyester resin having a specific content of isosorbide and diethylene glycol introduced therein, containing a low content of oligomer, and exhibiting a specific intrinsic viscosity, thereby exhibiting excellent mechanical properties, heat resistance and chemical resistance, and good heat sealability.
    Type: Grant
    Filed: June 25, 2018
    Date of Patent: July 26, 2022
    Assignee: SK Chemicals Co., Ltd.
    Inventors: Yoo Jin Lee, Sung-Gi Kim, Boo-youn Lee
  • Publication number: 20220227992
    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.
    Type: Application
    Filed: May 28, 2020
    Publication date: July 21, 2022
    Applicant: SK CHEMICALS CO., LTD.
    Inventors: Da-Young HWANG, Yoo Jin LEE
  • Publication number: 20220227922
    Abstract: The present disclosure relates to a polyester resin blend. The polyester resin blend can provide a thick container with high transparency even if it contains recycled polyethylene terephthalate as well as virgin polyethylene terephthalate. In addition, the resin blend can be reused by itself, and is expected to be useful for providing continuously usable plastics that have been recently attracting attention.
    Type: Application
    Filed: May 28, 2020
    Publication date: July 21, 2022
    Applicant: SK CHEMICALS CO., LTD.
    Inventors: Da-Young HWANG, Yoo Jin LEE
  • Publication number: 20220168308
    Abstract: The present invention provides methods for reducing amyloid beta formation and for treating diseases associated with IC the accumulation of amyloid beta, The present invention provides (1) A ? aggregation inhibition by A ? Oligomer/Fibril formation inhibition, (2) BACE-1 reduced a through ?-Amyloidogenic Processing inhibition, (3) cerebral blood flow to the increase of the cell outer A? Monomer, Oligomer & A? Fibril/Plaque reduction, (4) NO/cGMP/PKG/CREB Pathway to the activation of Neuronal cell Death inhibition and Neurogenesis, Synaptogenesis, Angiogenesis promotion, (5) DKK-1 inhibition by Wnt Signaling in the activation of synaptic plasticity recovery and A? production Positive Feedback Loop for inhibition of APP generates reduced and A? accumulation suppression, (6) Autophagy activation by cells within Toxic Mirodenafil, Sildenafil, Vardenafil, Tadalafil, Udenafil, Dasantafil, and Avanafil for the treatment of inhibition of A? Fibril/Plaque formation through removal of Soluble A? Oligomer; and a Pha
    Type: Application
    Filed: March 24, 2020
    Publication date: June 2, 2022
    Applicants: ARIBIO CO., LTD., SK CHEMICALS CO., LTD.
    Inventors: Jai Jun Choung, Yoon Pyo CHOI, Byungwoo KANG, Fred KIM, Mi Sun CHOUNG
  • Patent number: 11312821
    Abstract: Provided are a polyester resin having a high residual rate of isosorbide, thereby exhibiting excellent heat resistance, excellent mechanical properties such as tensile strength, Young's modulus, etc., and excellent appearance properties and transparency, and a preparation method thereof.
    Type: Grant
    Filed: March 5, 2019
    Date of Patent: April 26, 2022
    Assignees: SK Chemicals Co., Ltd., Seoul National University R&DB Foundation
    Inventors: Ji-Hyun Kim, Jong Ryang Kim, Cheol Hee Ahn
  • Patent number: 11279799
    Abstract: Provided are a polyester resin having high heat resistance and degree of crystallinity, a preparation method thereof, and a resin molded article formed therefrom, the resin molded article having superior heat resistance and mechanical strength and maintaining high transparency.
    Type: Grant
    Filed: December 12, 2016
    Date of Patent: March 22, 2022
    Assignee: SK Chemicals Co., Ltd.
    Inventors: Su-Min Lee, Yoo Jin Lee, Kyu-Chan Han
  • Patent number: 11203676
    Abstract: There is provided a heat shrinkable film comprising a polyester based copolymer capable of having an excellent shrinkage rate and being heat shrunk at a low temperature. The heat shrinkable film according to an exemplary embodiment of the present invention includes a polyester based copolymer, wherein the polyester based copolymer includes: 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 represented by the following Chemical Formula 1 and a residue derived from 4,4-(oxybis(methylene)bis) cyclohexane methanol represented by the following Chemical Formula 2.
    Type: Grant
    Filed: May 19, 2020
    Date of Patent: December 21, 2021
    Assignee: SK Chemicals Co., Ltd.
    Inventors: Seol-Hee Lim, Sung-Gi Kim, Ji Yea Lee
  • Publication number: 20210380759
    Abstract: A copolycarbonate ester produced from a polymerizable composition according to the present invention can have various physical properties by being copolymerized through the melt-polycondensation of: 1,4:3,6-dianhydrohexitol and/or a diol compound other than 1,4:3,6-dianhydrohexitol; a carbonate compound; and a petroleum-based and/or bio-based diphenyl ester and/or an additional diphenyl ester compound other than the petroleum-based and/or bio-based diphenyl ester, and can thus be usefully applied to the manufacture of segmented products.
    Type: Application
    Filed: October 8, 2019
    Publication date: December 9, 2021
    Applicant: SK CHEMICALS CO., LTD.
    Inventor: Kwang Sei OH
  • Publication number: 20210380760
    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.
    Type: Application
    Filed: September 26, 2019
    Publication date: December 9, 2021
    Applicant: SK CHEMICALS CO., LTD.
    Inventor: Kwang Sei OH
  • Publication number: 20210301081
    Abstract: A bio-based polycarbonate ester resin is environment friendly by not containing a bisphenol, and exhibits excellent heat resistance, transparency, strength, hardness, dimensional stability and chemical resistance. Thus, the bio-based polycarbonate ester resin is suitable for use in an eyeglass frame. In addition, various colors may be painted and coated on during post-processing, a separate additive is not required during a molding process, and processing is undergone at a temperature lower than that for conventional plastic materials for an eyeglass frame, and thus manufacturing costs may be reduced.
    Type: Application
    Filed: July 2, 2019
    Publication date: September 30, 2021
    Applicant: SK CHEMICALS CO., LTD.
    Inventors: Kwang Sei OH, Jong-ln LEE
  • Patent number: 11118051
    Abstract: The present invention relates to a polylactic acid resin composition and a molded product using same. Since the polylactic acid resin composition according to the present invention has excellent environmental friendliness and biodegradability, has excellent heat resistance characteristics due to high heat deformation temperature (HDT), and may be injection molded within a commercially reasonable cycle time due to high crystallinity and crystallization rate, it is suitable for the preparation of a molded product.
    Type: Grant
    Filed: January 24, 2017
    Date of Patent: September 14, 2021
    Assignee: SK CHEMICALS CO., LTD.
    Inventors: Min-young Kim, Tae-Young Kim, Jeoung-Jun Hwang, Jae-il Chung
  • Patent number: 11020947
    Abstract: This disclosure relates to a thermo-shrinkable polyester film with excellent UV absorbance and heat resistance. According to one embodiment of the invention, provided is a thermo-shrinkable polyester film comprising a first resin layer comprising polyester resin comprising residues of dicarboxylic acid components comprising aromatic dicarboxylic acid, and residues of diol components comprising 4-(hydroxymethyl)cyclohexylmethyl 4?-(hydroxymethyl)cyclohexanecarboxylate, and 4,4-(oxybis(methylene)bis)cyclohexane methanol; and a second resin layer comprising the polyester resin and a UV absorber, formed on at least one side of the first layer.
    Type: Grant
    Filed: July 17, 2015
    Date of Patent: June 1, 2021
    Assignee: SK Chemicals Co., Ltd.
    Inventors: Seol-Hee Lim, Sung-Gi Kim