Patents by Inventor Young-Man Yoo
Young-Man Yoo has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10501604Abstract: 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 (% Cbio) of biomass-based carbon, as defined in Equation 1, is at least 60 wt %; and an antioxidant.Type: GrantFiled: April 2, 2014Date of Patent: December 10, 2019Assignee: SK Chemicals Co., Ltd.Inventors: Young-Man Yoo, Jae-il Chung, Kye Yune Lee, Sung-wan Jeon, Min-young Kim
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Patent number: 9567429Abstract: The present invention relates to a polylactic acid resin film which has excellent flexibility, mechanical properties, stability, and transparency while having a specific biodegradability of the polylactic acid resin, and is useful as a packaging material. The present invention provides a polylactic acid resin film, comprising a polylactic acid resin including a hard segment comprising a specific polylactic acid repeating unit, and a soft segment comprising a polyurethane polyol repeating unit in which a specific polyether polyol repeating units are linearly linked via a urethane bond, wherein the total Young's modulus in both machine direction and transverse direction of the film is 350 to 750 kgf/mm2, and the total initial tensile strength in both machine direction and transverse direction of the film is 20 kgf/mm2 or more.Type: GrantFiled: November 2, 2011Date of Patent: February 14, 2017Inventors: Young-Man Yoo, Jae-Il Chung, Tae-Woong Lee, Kye-Yune Lee
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Patent number: 9567428Abstract: The present invention relates to a polylactic acid resin composition useful as a packaging material which has not only improved flexibility but also superior external appearance and superior properties such as mechanical property, transparency, heat resistance, anti-blocking property, workability of a film, and the like, and a packaging film including the same. The polylactic acid resin composition comprises a polylactic acid resin including a hard segment comprising a polylactic acid repeating unit and a soft segment comprising a polyurethane polyol repeating unit in which polyether polyol repeating units are linearly linked via a urethane bond; and a specific content of antioxidant.Type: GrantFiled: November 2, 2011Date of Patent: February 14, 2017Inventors: Young-Man Yoo, Tae-Woong Lee, Kye-Yune Lee, Jae-Il Chung
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Patent number: 9499658Abstract: The present invention relates to a polylactic acid resin and a packaging film comprising the same, wherein the polylactic acid resin is useful as a packaging material due to excellent properties including heat resistance as well as optimized flexibility. The polylactic acid resin comprises: a hard segment including a predetermined polylactic acid repeating unit; and a soft segment including a polyurethane polyol repeating unit in which certain polyether-based polyol repeating units are linearly connected in a medium of a urethane bond. In addition, the polylactic acid resin has a glass transition temperature (Tg) of 25-55° C.Type: GrantFiled: November 2, 2011Date of Patent: November 22, 2016Inventors: Young-Man Yoo, Tae-Woong Lee, Kye-Yune Lee, Jae-Il Chung
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Patent number: 9469719Abstract: The present invention relates to a polylactic acid resin and a packaging film comprising the same, wherein the polylactic acid resin is useful as a packaging material due to excellent properties including heat resistance as well as optimized flexibility. The polylactic acid resin comprises: a hard segment including a predetermined polylactic acid repeating unit; and a soft segment including a polyurethane polyol repeating unit in which certain polyether-based polyol repeating units are linearly connected in a medium of a urethane bond. In addition, the polylactic acid resin has a glass transition temperature (Tg) of 25-55° C.Type: GrantFiled: November 2, 2011Date of Patent: October 18, 2016Inventors: Young-Man Yoo, Tae-Woong Lee, Kye-Yune Lee, Jae-Il Chung
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Publication number: 20160053089Abstract: 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 (% Cbio) of biomass-based carbon, as defined in Equation 1, is at least 60 wt %; and an antioxidant.Type: ApplicationFiled: April 2, 2014Publication date: February 25, 2016Inventors: Young-Man Yoo, Jae-il Chung, Kye Yune Lee, Sung-wan Jeon, Min-young Kim
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Publication number: 20150147549Abstract: The present invention relates to a polylactic acid resin which is environment-friendly and is useful as a packaging material due to its properties including excellent heat resistance and flexibility, and a packaging film comprising the same. The polylactic acid resin comprises a hard segment comprising a polylactic acid repeating unit; and a soft segment comprising a polyurethane polyol repeating unit in which polyether polyol repeating units are linearly linked via a urethane bond, wherein the polylactic acid resin has an organic carbon content (% Cbio) from the biomass source of 60 wt % or more.Type: ApplicationFiled: May 29, 2013Publication date: May 28, 2015Applicant: SKI CHEMICALS CO.,LTD.Inventors: Young-Man Yoo, Jae-Il Chung, Tae-Woong Lee, Kye Yune Lee, Sung-Wan Jeon
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Patent number: 8883386Abstract: Disclosed herein is a toner for use in an electronic photograph-duplicating process or in an electrostatic printing process, and a polyester resin included in the toner as a binder. The polyester resin comprises lactic acids (D or L-lactic acids) or lactides (D or L-lactides) which are derivative compounds thereof, and dianhydrohexitols which are bio-derived sugar derivatives.Type: GrantFiled: January 6, 2011Date of Patent: November 11, 2014Assignee: SK Chemicals Co., Ltd.Inventors: Young Man Yoo, Kye Yune Lee, Tae Woong Lee, Jong Wook Shin
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Publication number: 20140302297Abstract: The present invention relates to a polylactic acid resin composition useful as a packaging material which has not only improved flexibility but also superior external appearance and superior properties such as mechanical property, transparency, heat resistance, anti-blocking property, workability of a film, and the like, and a packaging film including the same. The polylactic acid resin composition comprises a polylactic acid resin including a hard segment comprising a polylactic acid repeating unit and a soft segment comprising a polyurethane polyol repeating unit in which polyether polyol repeating units are linearly linked via a urethane bond; and a specific content of antioxidant.Type: ApplicationFiled: November 2, 2011Publication date: October 9, 2014Applicant: SK CHEMICALS CO., LTD.Inventors: Young-Man Yoo, Tae-Woong Lee, Kye-Yune Lee, Jae-Il Chung
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Publication number: 20140037931Abstract: The present invention relates to a polylactic acid resin film which has excellent flexibility, mechanical properties, stability, and transparency while having a specific biodegradability of the polylactic acid resin, and is useful as a packaging material. The present invention provides a polylactic acid resin film, comprising a polylactic acid resin including a hard segment comprising a specific polylactic acid repeating unit, and a soft segment comprising a polyurethane polyol repeating unit in which a specific polyether polyol repeating units are linearly linked via a urethane bond, wherein the total Young's modulus in both machine direction and transverse direction of the film is 350 to 750 kgf/mm2, and the total initial tensile strength in both machine direction and transverse direction of the film is 20 kgf/mm2 or more.Type: ApplicationFiled: November 2, 2011Publication date: February 6, 2014Applicant: SK CHEMICALS CO., LTD.Inventors: Young-Man Yoo, Jae-Il Chung, Tae-Woong Lee, Kye-Yune Lee
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Patent number: 8633295Abstract: A blend of polylactic acid resin and copolyester resin and a molded article using the same having superior impact resistance and heat resistance are disclosed. The blend of polylactic acid resin and copolyester resin includes: 5 to 95 weight % of polylactic acid resin; and 5 to 95 weight % of copolyester resin which is a copolymerization product of an acid component including terephthalic acid and a diol component including 5 to 99 mol % of 1,4-cyclohexanedimethanol and 1 to 60 mol % of isosorbide(bio monomer), and has a repeated structure of an acid moiety derived from the acid component and a diol moiety derived from the diol component.Type: GrantFiled: May 19, 2011Date of Patent: January 21, 2014Assignee: SK Chemicals Co., Ltd.Inventors: Roy Lee, Jong-Ryang Kim, Kye-Yune Lee, Jong-Wook Shin, Young-Man Yoo
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Publication number: 20140004330Abstract: The present invention relates to a polylactic acid resin and a packaging film comprising the same, wherein the polylactic acid resin is useful as a packaging material due to excellent properties including heat resistance as well as optimized flexibility. The polylactic acid resin comprises: a hard segment including a predetermined polylactic acid repeating unit; and a soft segment including a polyurethane polyol repeating unit in which certain polyether-based polyol repeating units are linearly connected in a medium of a urethane bond. In addition, the polylactic acid resin has a glass transition temperature (Tg) of 25-55° C.Type: ApplicationFiled: November 2, 2011Publication date: January 2, 2014Applicant: SK CHEMICALS CO., LTD.Inventors: Young-Man Yoo, Tae-Woong Lee, Kye-Yune Lee, Jae-II Chung
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Publication number: 20130072642Abstract: A blend of polylactic acid resin and copolyester resin and a molded article using the same having superior impact resistance and heat resistance are disclosed. The blend of polylactic acid resin and copolyester resin includes: 5 to 95 weight % of polylactic acid resin; and 5 to 95 weight % of copolyester resin which is a copolymerization product of an acid component including terephthalic acid and a diol component including 5 to 99 mol % of 1,4-cyclohexanedimethanol and 1 to 60 mol % of isosorbide(bio monomer), and has a repeated structure of an acid moiety derived from the acid component and a diol moiety derived from the diol component.Type: ApplicationFiled: May 19, 2011Publication date: March 21, 2013Applicant: SK CHEMICALS CO., LTD.Inventors: Roy Lee, Jong-Ryang Kim, Kye-Yune Lee, Jong-Wook Shin, Young-Man Yoo
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Patent number: 8313881Abstract: A toner for an electrophotographic image forming process or an electrostatic printing process, and a polyester resin for the toner are disclosed. The polyester resin comprises: acid components including 70 to 96 mol % of aromatic dibasic acid component, 3 to 20 mol % of cycloaliphatic dibasic acid component, and 1 to 10 mol % of trivalent or higher acid component; alcohol components including 10 to 50 mol % of cycloaliphatic diol component, 2 to 20 mol % of trihydric or higher alcohol component, and 30 to 88 mol % of aliphatic diol component; and a heat stabilizer.Type: GrantFiled: July 10, 2008Date of Patent: November 20, 2012Assignee: SK Chemicals Co., Ltd.Inventors: Young-Man Yoo, Jae-Kyoung Roh, Kye-Yune Lee, Tae-Woong Lee
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Publication number: 20120276479Abstract: Disclosed herein is a toner for use in an electronic photograph-duplicating process or in an electrostatic printing process, and a polyester resin included in the toner as a binder. The polyester resin comprises lactic acids (D or L-lactic acids) or lactides (D or L-lactides) which are derivative compounds thereof, and dianhydrohexitols which are bio-derived sugar derivatives.Type: ApplicationFiled: January 6, 2011Publication date: November 1, 2012Inventors: Young Man Yoo, Kye Yune Lee, Tae Woong Lee, Jong Wook Shin
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Patent number: 8133650Abstract: A polyester resin which includes acid components having aromatic dibasic acid component and trivalent or higher acid component; alcohol components including aliphatic, aromatic or cycloaliphatic diol component, and trihydric or higher alcohol component; polyolefin polyol having 1,800 to 2,500 number average molecular weight and hydroxyl value of 40 to 55 KOHmg/g; and wax having melting point of 80 to 110, wherein the amount of the polyolefin polyol is 0.1 to 2 weight % and the amount of the wax is 0.5 to 15 weight % with respect to the total polyester resin. Also disclosed is a method for preparing polyester resin by (a) carrying out an esterification reaction or an ester exchange reaction with the acid components, the alcohol components, and the polyolefin polyol; and (b) carrying out a polycondensation reaction for reaction product of the esterification or ester exchange reaction in the presence of the wax.Type: GrantFiled: July 10, 2008Date of Patent: March 13, 2012Assignee: SK Chemicals Co., Ltd.Inventors: Young-Man Yoo, Jae-Kyoung Roh, Kye-Yune Lee, Tae-Woong Lee
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Publication number: 20100261867Abstract: A toner for an electrophotographic image forming process or an electrostatic printing process, and a polyester resin for the toner are disclosed. The polyester resin comprises: acid components including aromatic dibasic acid component and trivalent or higher acid component; alcohol components including aliphatic, aromatic or cycloaliphatic diol component, and trihydric or higher alcohol component; poly olefin polyol having number average molecular weight of 1,800 to 2,500 and hydroxyl value of 40 to 55 KOHmg/g; and wax having melting point of 80 to 110° C., wherein the amount of the poly olefin polyol is 0.1 to 2 weight % and the amount of the wax is 0.5 to 15 weight % with respect to the total polyester resin.Type: ApplicationFiled: July 10, 2008Publication date: October 14, 2010Inventors: Young-Man Yoo, Jae-Kyoung Roh, Kye-Yune Lee, Tae-Woong Lee
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Publication number: 20100239970Abstract: A toner for an electrophotographic image forming process or an electrostatic printing process, and a polyester resin for the toner are disclosed. The polyester resin comprises: acid components including 70 to 96 mol % of aromatic dibasic acid component, 3 to 20 mol % of cycloaliphatic dibasic acid component, and 1 to 10 mol % of trivalent or higher acid component; alcohol components including 10 to 50 mol % of cycloaliphatic diol component, 2 to 20 mol % of trihydric or higher alcohol component, and 30 to 88 mol % of aliphatic diol component; and a heat stabilizer.Type: ApplicationFiled: July 10, 2008Publication date: September 23, 2010Inventors: Young-Man Yoo, Jae-Kyoung Roh, Kye-Yune Lee, Tae-Woong Lee
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Publication number: 20080113289Abstract: A polyester resin for toner, which has superior fixing property, storage stability, and image density in an electrophotographic image forming process or an electrostatic printing process, and a toner including the same are disclosed. The polyester resin for toner is produced by carrying out esterification reaction and polycondensation reaction of reactant comprising aromatic dibasic acid of 80 to 100 mol % with respect to the total dibasic acid, trivalent or higher acid of 0.5 to 30 mol % with respect to the total dibasic acid, aromatic diol of equal to or less than 90 mol % with respect to the total dibasic acid, and aliphatic diol of 10 to 80 mol % with respect to the total dibasic acid, in the presence of a polycondensation catalyst selected from the group consisting of TiO2/SiO2 coprecipitates, TiO2/ZrO2 coprecipitates and the mixture thereof.Type: ApplicationFiled: December 21, 2005Publication date: May 15, 2008Inventors: Jae-Kyoung Roh, Young-Man Yoo, Kyoung-Ha Lee, Kye-Yune Lee, Tae-Woong Lee