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71.发明申请公开(公告)号：US20230090327A1
公开(公告)日：2023-03-23
申请号：US17790592
申请日：2020-12-30
摘要： Methods for preparing mixed polyamides, polyimides and polyamideimides under hydrothermal polymerization conditions are provided. The methods are based on suitable mixtures of poly carboxylic acids, poly carboxylic dianhydrides or poly carboxylic acid chloride anhydrides and polyamines and provide routes to low cost structural polymers useful in, for example, infrastructure applications.
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公开(公告)号：US20230059885A1
公开(公告)日：2023-02-23
申请号：US17617522
申请日：2021-04-29
发明人： JINGANG LIU , XINXIN ZHI , YAN ZHANG , CHENYU GUO , LIN WU , XIAO WU
摘要： The present disclosure discloses a high-whiteness polyimide microfiber and a preparation method thereof and use. The polyimide fiber includes polyimide obtained from the reaction of wholly alicyclic dianhydride HTDA and an aromatic diamine monomer containing methyl or trifluoromethyl by chemical imidization. In the present disclosure, the polyimide microfiber has both excellent heat-resistant stability and spinning film-forming property, and the fabric has ultra-high whiteness. The microfiber fabric prepared from the polyimide fiber may be used as a component with high-temperature resistant and high-whiteness in personal protective equipment such as mask and protective clothing, and also may be used as an electronic component in the high-tech field such as aerospace, optoelectronic, microelectronic and automobile.
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公开(公告)号：US20230044498A1
公开(公告)日：2023-02-09
申请号：US17783507
申请日：2020-12-30
摘要： A polyetherimide composition comprises: a polyetherimide; and an organophosphorus stabilizer present in an amount effective to provide greater than 0.01 ppm to less than 20 ppm, preferably greater than 0.01 ppm to less than 10 ppm, and more preferably greater than 0.01 ppm to less than 4.8 ppm of phosphorus based on the total weight of the polyetherimide composition, the organophosphorus stabilizer having a molecular weight of 300 to 2,000 Daltons and a phosphorus content of 1 to 15 wt %; wherein a molded sample of the polyetherimide composition has a UL 94 V0 rating at a thickness of 1.5 mm.
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公开(公告)号：US20230028353A1
公开(公告)日：2023-01-26
申请号：US17765961
申请日：2020-09-29
IPC分类号： G02F1/1337 , G02F1/137 , C08G73/10 , C09K19/56 , C09K19/60
摘要： A liquid crystal light control element that controls a light absorption state by voltage application, the liquid crystal light control element including: a liquid crystal layer containing a liquid crystal composition between a pair of substrates each having an electrode; and a liquid crystal alignment film that is provided on at least one of the substrates and aligns a liquid crystal vertically, wherein the liquid crystal composition contains a liquid crystal and a dichroic dye, the liquid crystal alignment film is obtained from a liquid crystal aligning agent containing a polyimide precursor in which a diamine having a specific side chain is used as a part of the raw material or a polyimide obtained by imidizing the polyimide precursor, and the proportion of the diamine used is 50 to 100 mol % based on the entire diamine component.
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公开(公告)号：US11549013B2
公开(公告)日：2023-01-10
申请号：US16482885
申请日：2018-07-17
申请人： LG CHEM, LTD.
发明人： Cheolmin Yun , Kyungjun Kim
摘要： A polyimide copolymer according to the present invention has a particular structure in which siloxane structures are distributed in a nanosize in a polymer and thus enables excellent transparency, heat resistance, mechanical strength and flexibility and effective reduction of residual stress, and thus can be used in various fields such as a substrate for a device, a cover substrate for a display, an optical film, an integrated circuit (IC) package, an adhesive film, a multi-layer flexible printed circuit (FPC), tape, a touch panel and a protective film for an optical disk.
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公开(公告)号：US11537020B2
公开(公告)日：2022-12-27
申请号：US16496963
申请日：2019-06-14
发明人： Yamin Wang
IPC分类号： H01L51/50 , G02F1/1516 , C08G73/10 , C09K11/06 , G02F1/157 , G02F1/163 , H01L27/32 , H01L51/00
摘要： The present invention provides an electrochromic polyamic acid material, a preparation method thereof and a display device, wherein the molecular structure of the electrochromic polyamic acid material includes oligoaniline and carbazolyl triphenylamine. The oligoaniline serves as an electrochemically sensitive group, and the carbazolyl triphenylamine serves as a fluorescence emitting group. The electrochromic polyamic acid material is an electrically controlled fluorescent polymer. Fluorescence intensity of the electrochromic polyamic acid material undergoes reversible fluorescence conversion with a change of an applied voltage, due to a redox reaction of the oligoaniline at different voltages, resulting in an interchange between a benzene ring and an anthracene ring in a molecular structure, and an electron/energy transfer path with the fluorescence emitting group are generated or eliminated, thereby realizing the electrically controlled fluorescent properties of the electrochromic polyamic acid material.
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公开(公告)号：US11524491B2
公开(公告)日：2022-12-13
申请号：US17107787
申请日：2020-11-30
发明人： Wei-Hsin Huang , Chi-Fei Huang , Szu-Hsiang Su , Shou-Jui Hsiang , Kuan-Wei Lee
IPC分类号： B32B27/28 , B29C53/56 , B32B37/02 , B29C53/00 , B29C53/16 , B32B38/10 , B32B38/00 , B32B37/20 , B29K105/00 , C08G73/10 , B29K79/00 , C08G69/32
摘要： A method for manufacturing a thick polyimide film includes providing a first and second laminated structures. The first and second laminated structures are heated, and the heated first and second laminated structures are wound together to form a third laminated structure. The first polyamic acid gel film of the heated first laminated structure and the second polyamic acid gel film of the heated second laminated structure are overlapped and bonded together to form a third polyamic acid gel film. Two third laminated structures are wound together to form a fourth polyamic acid gel film. A dehydration ring-closure imidization reaction is applied to the fourth polyamic acid gel film by heating to obtain the thick polyimide film. A thick polyimide film manufactured by the method is also disclosed.
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公开(公告)号：US11518852B2
公开(公告)日：2022-12-06
申请号：US16489401
申请日：2017-03-01
发明人： Yasuyuki Saito
摘要： A polyamideimide resin having an isocyanate group blocked with a compound selected from the group consisting of alcohols, oximes and lactams, and having a carboxyl group blocked with a vinyl ether group-containing compound.
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公开(公告)号：US20220380541A1
公开(公告)日：2022-12-01
申请号：US17875441
申请日：2022-07-28
发明人： Hailun BORJIGIN , Lingzhu ZHANG
IPC分类号： C08G73/10 , B29C64/393 , B29C64/129
摘要： A dual-cure method for forming a solid polymeric structure is provided. An end-capped, imide-terminated prepolymer is combined with at least one photopolymerisable olefinic monomer, at least one photoinitiator, and a diamine, to form a curable resin composition, which, in a first step, is irradiated under conditions effective to polymerize the at least one olefinic monomer, thus forming a scaffold composed of the prepolymer and the polyolefin with the diamine trapped therein. The irradiated composition is then thermally treated at a temperature effective to cause a transimidization reaction to occur between the prepolymer and the diamine, thereby releasing the end caps of the prepolymer and providing the solid polymeric structure. A curable resin composition comprising an end-capped, imide-terminated prepolymer, at least one photopolymerisable olefinic monomer, at least one photoinitiator, and a diamine, is also provided, as are related methods of use.
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公开(公告)号：US20220372225A1
公开(公告)日：2022-11-24
申请号：US17776057
申请日：2019-12-02
发明人： Sung-Yul BACK , Kil-Nam LEE
摘要： Disclosed herein is provided a method for manufacturing a polyimide film, the method comprising the steps of: preparing a polyamic acid solution; preparing a polyamic add composition by adding 2-3 mole equivalents of a dehydrating agent to the polyamic acid solution; and applying the polyamic acid to a support to form a film, followed by thermosetting the film in a heater.
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