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公开(公告)号：US11753510B2
公开(公告)日：2023-09-12
申请号：US17597430
申请日：2020-05-28
Inventor： Sung Yeon Hwang , Jeyoung Park , Dong Yeop Oh , Tae Ho Kim , Si Gyeong Lee , Myung Suk Shin , Jong Geon Jegal
CPC classification number: C08J5/045 , C08G63/12 , C08G63/81 , C08K7/02 , C08G2230/00 , C08J2367/02 , C08K2201/005 , C08K2201/011 , C08K2201/018
Abstract: A biodegradable composite material which is produced by polymerizing a mixture of an aqueous dispersion of a natural polymer nanofiber including any one or more of a chitin nanofiber and a cellulose nanofiber, a dicarboxylic acid or a derivative thereof, and a diol. The biodegradable composite material has excellent biodegradable and mechanical properties.
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公开(公告)号：US12269922B2
公开(公告)日：2025-04-08
申请号：US17056981
申请日：2019-03-19
Inventor： Jeyoung Park , Dong Yeop Oh , Sung Yeon Hwang , Hyun Gil Cha , Jong Geon Jegal , Ho Jun Kim , Seul A Park
Abstract: A method for preparing an aramid nanofiber dispersion includes dissolving an aromatic polyamide-based polymer in a solution including a basic material and an aprotic polar solvent, while performing stirring so that a nanofiber is produced, wherein the aromatic polyamide-based polymer is a polymer in a form of a solid which is not spun into a fiber form, the stirring is performed at a temperature of 50° C. or lower and at a speed of 10-1000 rpm so that a time taken for the aromatic polyamide-based polymer to be dissolved and formed into an aramid nano-fiber dispersion is 80 hours or less, an aramid nanofiber in the aramid nanofiber dispersion has an average diameter of 1 to 100 nm and an average length of 0.1 to 100 μm, and the basic material includes potassium hydroxide or sodium hydroxide.
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公开(公告)号：US11299578B2
公开(公告)日：2022-04-12
申请号：US16618582
申请日：2018-07-11
Inventor： Sung Yeon Hwang , Jeyoung Park , Dong Yeop Oh , Jong Geon Jegal , Seon Mi Kim , Hyeon Yeol Jeon
Abstract: A self-restoring polyurethane-based polymer obtained by polymerization of a composition containing an aromatic disulfide diol represented by Chemical Formula, HO—Ar1—S—S—Ar2—OH, an alicyclic polyisocyanate, and a polyol. Ar1 and Ar2 each are independently a substituted or unsubstituted C6-C30 arylene group. The composition satisfies Equation, 0.1≤M[disulfide]/M[OH]. M[disulfide] is a total mole number of the aromatic disulfide diol in the composition, and M[OH] is a total mole number of the aromatic disulfide diol and the polyol in the composition.
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公开(公告)号：US20220064387A1
公开(公告)日：2022-03-03
申请号：US17082207
申请日：2020-10-28
Applicant: Hyundai Motor Company , Kia Motors Corporation , Korea Research Institute Of Chemical Technology
Inventor： Chae Hwan Hong , Jin Woo Choung , Dong Yeop Oh , Seul A Park , Hyeon Yeol Jeon , Jeyoung Park , Sung Yeon Hwang
IPC: C08J5/18
Abstract: Disclosed is a composite film including a nanocellulose film including cellulose nanofibers stacked in a structure including a plurality of pores; and a polycarbonate resin filling the pores in the nanocellulose film and including a repeating unit that comprises a moiety derived from isosorbide.
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