Patents by Inventor Gyung Don Kang
Gyung Don Kang 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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Publication number: 20170129991Abstract: The present invention relates to a method for using a combination of two kinds of thermal stabilizers in a production process in order to improve the thermal stability of biodegradable polyester resins, and to biodegradable polyester resin produced therefrom. In said method, two kinds of thermal stabilizers improve thermal stability by acting complementarily with each other. Thus, a high temperature reaction is possible, and due to an increase in the reactivity, the reaction time is shortened and the molecular weight is increased. In addition, the obtained resin can provide high quality products, since the acid value thereof is reduced to improve the hydrolysis resistance thereof, and the chromaticity thereof is enhanced to thereby be capable of preventing a yellowing phenomenon of the final product.Type: ApplicationFiled: May 22, 2015Publication date: May 11, 2017Applicant: LOTTE FINE CHEMICAL CO., LTD.Inventors: Ye Jin Kim, Ki Chull Yun, Gyung Don Kang, Ji Soo Ahn, Sang Mi Kang, Min Kyoung Kim, Mi Hwa Yang, Kil Seuk Byun
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Patent number: 9637589Abstract: Provided is a method of continuous preparation of a biodegradable aliphatic/aromatic polyester copolymer, the method including: performing a first esterification reaction of an aliphatic dihydroxy compound and an aliphatic dicarboxylic acid at a temperature of 185° C. or less; continuously performing a second esterification reaction of a reaction product obtained by the first esterification reaction; obtaining a pre-polymer by continuously performing a first polycondensation reaction of a reaction product obtained by the second esterification reaction; and continuously performing polycondensation reaction of the pre-polymer, wherein an aromatic carboxylic acid is added to a reactor in which the first esterification reaction or the second esterification reaction is performed, to prepare the biodegradable aliphatic/aromatic polyester copolymer.Type: GrantFiled: May 20, 2013Date of Patent: May 2, 2017Assignees: LOTTE FINE CHEMICAL CO., LTD., S-ENPOL CO., LTD.Inventors: Gyung Don Kang, Ki Chull Yun, Sang Yob Kim, Kil Seuk Byun, Jung Ryum, Boo Seong Kim, Sei Hoon Kim, Sung Bae Park
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Publication number: 20170112111Abstract: The present invention relates to a biodegradable resin having outstanding colouring properties, and provides a resin composition which does not give rise to problems such as reduced strength due to colouration. The composition of the present invention, suggests that a PBSAT resin is used as a biodegradable resin, and colouration is performed with same. Also, at this time, the colourant can be mixed in the form of masterbatch. In the present invention, the resin composition is used in the production of various products, in particular monofilament yarn produced via spinning and a fishing net manufactured from same is provided. Fishing nets such as the above are advantageous in that such fishing nets can be realized in various colours in accordance with customer requirements and satisfy the required strength and, after use, degrade naturally in seawater and so do not give rise to problems like environmental pollution.Type: ApplicationFiled: May 22, 2015Publication date: April 27, 2017Applicant: LOTTE FINE CHEMICAL CO., LTD.Inventors: Min Kyoung Kim, Ki Chull Yun, Gyung Don Kang, Ji Soo Ahn, Sang Mi Kang, Ye Jin Kim, Mi Hwa Yang, Kil Seuk Byun
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Publication number: 20170101504Abstract: The present invention is characterized by introducing isosorbide to a monomer configuration for securing the transparency of a biodegradable polymer as well as providing material having excellent heat resistance and flexibility, As a monomer, a component derived from isosorbide which has a rigid structure is contained by 10-50 mol % of a total diol component, thereby bringing a heat resistance enhancing effect, and enhancing transparency by interfering with crystal formation, and allowing for providing a polymer having excellent flexibility. Thus, the present invention may enable securing stability in usage especially in the packaging area, and enable the heightening of the range of usage and utilization thereof.Type: ApplicationFiled: May 22, 2015Publication date: April 13, 2017Applicant: LOTTE FINE CHEMICAL CO., LTD.Inventors: Ji Soo Ahn, Sang Mi Kang, Min Kyoung Kim, Ki Chull Yun, Gyung Don Kang, Ye Jin Kim, Mi Hwa Yang
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Patent number: 9617378Abstract: A method of preparing a biodegradable polyester resin is provided. The method of preparing a biodegradable polyester resin includes: (a) synthesizing the biodegradable polyester resin having a reheating crystallization initiation temperature (Tch1), a reheating crystallization peak temperature (Tch), and a reheating crystallization end temperature (Tch2); and (b) crystallizing the biodegradable polyester resin synthesized in step (a) by cooling the resin from a temperature of T1 to a temperature of T2 and then maintaining the resin at a temperature of T2 for a time of tc. Thus, the biodegradable polyester resin with improved solidification rate may be obtained.Type: GrantFiled: August 25, 2014Date of Patent: April 11, 2017Assignee: LOTTE FINE CHEMICAL CO., LTD.Inventors: Ye Jin Kim, Gyung Don Kang, Ki Chull Yoon
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Patent number: 9447233Abstract: A continuous preparation method of a biodegradable aliphatic/aromatic polyester copolymer includes: performing a first esterification reaction of an aliphatic dihydroxy compound with an aliphatic dicarboxylic acid at a temperature of 185° C.Type: GrantFiled: July 18, 2013Date of Patent: September 20, 2016Assignees: LOTTE FINE CHEMICAL CO., LTD., S-ENPOL CO., LTD.Inventors: Gyung Don Kang, Ki Chull Yun, Sang Yob Kim, Kil Seuk Byun, Jung Ryum, Boo Seong Kim, Sei Hoon Kim, Sung Bae Park
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Patent number: 9416224Abstract: A continuous preparation method of a biodegradable aliphatic/aromatic polyester copolymer includes: performing a first esterification reaction of an aliphatic dihydroxy compound with an aliphatic dicarboxylic acid at a temperature of 185° C. or less; continuously performing a second esterification reaction of a reaction product from the first esterification reaction; continuously performing a first polycondensation reaction of a reaction product from the second esterification reaction to obtain a prepolymer; continuously performing a second polycondensation reaction of the prepolymer to obtain a second polycondensation reaction product having an intrinsic viscosity from about 0.9 dl/g to about 1.Type: GrantFiled: July 18, 2013Date of Patent: August 16, 2016Assignees: LOTTE FINE CHEMICAL CO., LTD., S-ENPOL CO., LTD.Inventors: Gyung Don Kang, Ki Chull Yun, Sang Yob Kim, Kil Seuk Byun, Jung Ryum, Boo Seong Kim, Sei Hoon Kim, Sung Bae Park
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Publication number: 20160222158Abstract: A method of preparing a biodegradable polyester resin is provided. The method of preparing a biodegradable polyester resin includes: (a) synthesizing the biodegradable polyester resin having a reheating crystallization initiation temperature (Tch1), a reheating crystallization peak temperature (Tch), and a reheating crystallization end temperature (Tch2); and (b) crystallizing the biodegradable polyester resin synthesized in step (a) by cooling the resin from a temperature of T1 to a temperature of T2 and then maintaining the resin at a temperature of T2 for a time of tc. Thus, the biodegradable polyester resin with improved solidification rate may be obtained.Type: ApplicationFiled: August 25, 2014Publication date: August 4, 2016Inventors: Ye Jin Kim, Gyung Don Kang, Ki Chull Yoon
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Patent number: 9403938Abstract: A continuous preparation method of a biodegradable aliphatic/aromatic polyester copolymer includes: performing a first esterification reaction of an aliphatic dihydroxy compound with an aliphatic dicarboxylic acid at a temperature of 185° C.Type: GrantFiled: July 18, 2013Date of Patent: August 2, 2016Assignees: LOTTE FINE CHEMICAL CO., LTD., S-ENPOL CO., LTD.Inventors: Gyung Don Kang, Ki Chull Yun, Sang Yob Kim, Kil Seuk Byun, Jung Ryum, Boo Seong Kim, Sei Hoon Kim, Sung Bae Park
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Patent number: 9376502Abstract: Provided are acetylated cellulose ether and an article including the same. The acetylated cellulose ether has a molecular weight of about 1,000 to about 1,000,000 Daltons, a contact angle of about 20 to about 45 degrees (°), and a tensile strength of about 50 to about 100 MPa.Type: GrantFiled: March 9, 2011Date of Patent: June 28, 2016Assignee: LOTTE FINE CHEMICAL CO., LTD.Inventors: Gyung Don Kang, Jin Kyu Kang, Hyun Young Park, Min Ju Song
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Patent number: 9334359Abstract: Provided is a method of continuous production of a biodegradable aliphatic polyester including continuously performing an esterification reaction of a mixture including an aliphatic dihydroxy compound and aliphatic dicarboxylic acid at a temperature of 185° C. or less to obtain an ester; continuously performing a first polycondensation reaction of the ester to obtain a preliminary polymer; and continuously performing a polycondensation reaction of the preliminary polymer. According to the method of production, an amount of the aliphatic dihydroxy compound used decreases, which is a starting material, thereby decreasing the manufacturing cost of the biodegradable aliphatic polyester.Type: GrantFiled: May 20, 2013Date of Patent: May 10, 2016Assignees: LOTTE FINE CHEMICAL CO., LTD., S-ENPOL CO., LTD.Inventors: Gyung Don Kang, Ki Chull Yun, Sang Yob Kim, Jung Ryum, Boo Seong Kim, Kil Seuk Byun, Sei Hoon Kim, Sung Bae Park
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Publication number: 20160090443Abstract: Provided are a biodegradable polyester resin and an article including the resin. The provided biodegradable polyester resin includes an aliphatic dicarboxylic acid residue including a succinic acid residue and an adipic acid residue; and an aliphatic diol residue including at least one selected from the group consisting of an ethylene glycol residue and a butanediol residue in order to improve biodegradability and flexibility.Type: ApplicationFiled: May 30, 2014Publication date: March 31, 2016Applicant: SAMSUNG FINE CHEMICALS CO., LTD.Inventors: Ye Jin KIM, Gyung Don KANG, Su Kyung KIM, Min Kyoung KIM, Soo Youn CHOI, Ki Chull YOON, Kil Seuk BYUN
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Publication number: 20150315334Abstract: A continuous preparation method of a biodegradable aliphatic/aromatic polyester copolymer includes: performing a first esterification reaction of an aliphatic dihydroxy compound with an aliphatic dicarboxylic acid at a temperature of 185° C.Type: ApplicationFiled: July 18, 2013Publication date: November 5, 2015Inventors: Gyung Don KANG, Ki Chull YUN, Sang Yob KIM, Kil Seuk BYUN, Jung RYUM, Boo Seong KIM, Sei Hoon KIM, Sung Bae PARK
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Publication number: 20150315335Abstract: A continuous preparation method of a biodegradable aliphatic/aromatic polyester copolymer includes: performing a first esterification reaction of an aliphatic dihydroxy compound with an aliphatic dicarboxylic acid at a temperature of 185° C.Type: ApplicationFiled: July 18, 2013Publication date: November 5, 2015Applicants: SAMSUNG FINE CHEMICALS CO., LTD., S-ENPOL CO., LTD.Inventors: Gyung Don KANG, Ki Chull YUN, Sang Yob KIM, Kil Seuk BYUN, Jung RYUM, Boo Seong KIM, Sei Hoon KIM, Sung Bae PARK
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Publication number: 20150307657Abstract: A continuous preparation method of a biodegradable aliphatic/aromatic polyester copolymer includes: performing a first esterification reaction of an aliphatic dihydroxy compound with an aliphatic dicarboxylic acid at a temperature of 185° C. or less; continuously performing a second esterification reaction of a reaction product from the first esterification reaction; continuously performing a first polycondensation reaction of a reaction product from the second esterification reaction to obtain a prepolymer; continuously performing a second polycondensation reaction of the prepolymer to obtain a second polycondensation reaction product having an intrinsic viscosity from about 0.9 dl/g to about 1.Type: ApplicationFiled: July 18, 2013Publication date: October 29, 2015Inventors: Gyung Don KANG, Ki Chull YUN, Sang Yob KIM, Kil Seuk BYUN, Jung RYUM, Boo Seong KIM, Sei Hoon KIM, Sung Bae PARK
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Publication number: 20150252142Abstract: Provided is a method of continuous production of a biodegradable aliphatic polyester including continuously performing an esterification reaction of a mixture including an aliphatic dihydroxy compound and aliphatic dicarboxylic acid at a temperature of 185° C. or less to obtain an ester; continuously performing a first polycondensation reaction of the ester to obtain a preliminary polymer; and continuously performing a polycondensation reaction of the preliminary polymer. According to the method of production, an amount of the aliphatic dihydroxy compound used decreases, which is a starting material, thereby decreasing the manufacturing cost of the biodegradable aliphatic polyester.Type: ApplicationFiled: May 20, 2013Publication date: September 10, 2015Inventors: Gyung Don Kang, Ki Chull Yun, Sang Yob Kim, Jung Ryum, Boo Seong Kim, Kil Seuk Byun, Sei Hoon Kim, Sung Bae Park
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Publication number: 20150183927Abstract: Provided is a method of continuous preparation of a biodegradable aliphatic/aromatic polyester copolymer, the method including: performing a first esterification reaction of an aliphatic dihydroxy compound and an aliphatic dicarboxylic acid at a temperature of 185° C. or less; continuously performing a second esterification reaction of a reaction product obtained by the first esterification reaction; obtaining a pre-polymer by continuously performing a first polycondensation reaction of a reaction product obtained by the second esterification reaction; and continuously performing polycondensation reaction of the pre-polymer, wherein an aromatic carboxylic acid is added to a reactor in which the first esterification reaction or the second esterification reaction is performed, to prepare the biodegradable aliphatic/aromatic polyester copolymer.Type: ApplicationFiled: May 20, 2013Publication date: July 2, 2015Applicants: S-ENPOL CO., LTD., SAMSUNG FINE CHEMICALS CO., LTD.Inventors: Gyung Don Kang, Ki Chull Yun, Sang Yob Kim, Kil Seuk Byun, Jung Ryum, Boo Seong Kim, Sei Hoon Kim, Sung Bae Park
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CATALYST FOR SYNTHESIZING POLYESTER RESIN AND METHOD OF MANUFACTURING POLYESTER RESIN USING THE SAME
Publication number: 20140288261Abstract: A catalyst used to manufacture a biodegradable polyester resin, in particular, an organic titanium catalyst which does not contain a heavy-metal component, and a method of manufacturing a polyester resin using the same. Accordingly, the method of manufacturing a polyester resin can be useful in attaining desired physical properties without using a catalyst harmful to environments and a human body. The biodegradable resin, which can be safely used in the field of applications in which the use of harmful components is a sensitive issue without using the components harmful to environments and a human body during the manufacture of a resin, can be prepared.Type: ApplicationFiled: February 4, 2013Publication date: September 25, 2014Inventors: Gyung Don Kang, Ki Chul Yoon, Ji Soo Ahn, Chung Il Lee, Ye Jin Kim, Sung Bae Park, Se Hoon Kim -
Publication number: 20140121332Abstract: There is provided a production method for a biodegradable resin using a relatively inexpensive compound as an aromatic dicarboxylic acid compound, wherein, during the process of producing a biodegradable resin in the form of an aliphatic-aromatic polyester copolymer, an aliphatic dihydroxyl compound used as a starting material is used in an amount of between 1 and 1.5 equivalent weight with respect to aliphatic and aromatic dicarboxylic acid compounds. The present invention includes the steps of: causing a hydroxyl group of the aliphatic dihydroxyl compound to undergo a first reaction with a carboxyl group of the aliphatic dicarboxylic acid compound; and causing the residual hydroxyl group of the aliphatic dihydroxyl compound to undergo a second reaction with a carboxyl group of the aromatic dicarboxylic acid compound.Type: ApplicationFiled: July 31, 2012Publication date: May 1, 2014Applicant: SAMSUNG FINE CHEMICALS CO., LTDInventors: Gyung Don Kang, Ki Chull Yun, Jong Pil Chun, Sung Bae Park
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Publication number: 20130245248Abstract: Provided are acetylated cellulose ether and an article including the same. The acetylated cellulose ether has a molecular weight of about 1,000 to about 1,000,000 Daltons, a contact angle of about 20 to about 45 degrees (°), and a tensile strength of about 50 to about 100 MPa.Type: ApplicationFiled: March 9, 2011Publication date: September 19, 2013Applicant: SAMSUNG FINE CHEMICALS CO., LTD.Inventors: Gyung Don Kang, Jin Kyu Kang, Hyun Young Park, Min Ju Song