CAS: 36978-41-3; 2,3,3,4-Biphenyl Tetracarboxylic Dianhydride

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CAS号36978-40-2 1,1'-Biphenyl-2...

1,1-联苯-2,3,3,4-四羧酸 以 水 用作溶剂,化学反应 4.0H,以6.7 G的收率获得2,3,3',4'-联苯四甲酸二酐
参考文献:一种超声波辅助催化偶联制备联苯二酐异构体的方法
标题:一种超声波辅助催化偶联制备联苯二酐异构体的方法
摘要:本发明公开了一种超声波辅助催化偶联制备联苯二酐异构体的方法,主要内容包括以镍盐催化剂,以锌为还原剂,以2‑thf用作溶剂,N‑芳基(或甲基)‑4‑氯代酞酰亚胺和n‑丙基(或异丙基)‑3‑氯代酞酰亚胺特殊组合的混合物为反应原料,在60~100oc下,通过超声波辅助催化偶联反应0.5~3小时,生成的三种联苯双亚胺混合物.利用三者溶解性的不同,进行分离,实现三种联苯二四酸异构体的分离提纯,最终获得联苯二酐异构体纯品,本专利申请的特点在于建立了一种简易的三种联苯四酸异构体分离的方法,解决了三种联苯二酐混合物难以分离难题,特别是以较低的成本获得了不对称结构的3,4‑联苯二酐'.

专利信息

专利号:US-10808079-B2
优先权日:2015-03-27
标 题:Synthesis of copolyimides containing fluorine and silicon surface modifying agents
发明人：CONNELL JOHN W; WOHL JR CHRISTOPHER J; DOSS JEREME R; CROW ALLISON M; KIM WILLIAM T; LIN YI
权利人:NASA
摘要:Various embodiments provide random copolyimides that may possess the mechanical, thermal, chemical and optical properties associated with polyimides yet achieve a low energy surface. In various embodiments, the copolyimides may be prepared using a minor amounts of a diamino terminated fluorinated alkyl ether oligomer and a diamino terminated siloxane oligomer. The various embodiments include processes for making the copolyimides containing fluorine and silicon surface modifying agents and anisotropic coatings and articles of manufacture from them. Thus the coatings and articles of manufacture made with the copolyimides of the various embodiments may be characterized as having an anisotropic fluorine and silicon composition and low surface energy.

专利号:US-7425650-B1
优先权日:2004-07-23
标 题 :Synthesis of asymmetric tetracarboxylic acids and corresponding dianhydrides
发明人：CHUANG CHUN-HUA
权利人:NASA
摘要:This invention relates to processes for preparing asymmetrical biphenyl tetracarboxylic acids and the corresponding asymmetrical dianhydrides, namely 2,3,3′,4′-biphenyl dianhydride (a-BPDA), 2,3,3′,4′-benzophenone dianhydride (a-BTDA) and 3,4′-methylenediphthalic anhydride (-MDPA). By cross-coupling reactions of reactive metal substituted o-xylenes or by cross-coupling o-xylene derivatives in the presence of catalysts, this invention specifically produces asymmetrical biphenyl intermediates that are subsequently oxidized or hydrolyzed and oxidized to provide asymmetric biphenyl tetracarboxylic acids in comparatively high yields. These asymmetrical biphenyl tetracarboxylic acids are subsequently converted to the corresponding asymmetrical dianhydrides without contamination by symmetrical biphenyl dianhydrides.

专利号:US-2025054696-A1
优先权日:2023-08-10
标 题:Thin film capacitor
发明人：CHO WEI-YU
权利人:META SYNTHESIS MAT CO LTD
摘要:A thin film capacitor is provided. The thin film capacitor includes a dielectric layer and a conductive layer. The dielectric layer includes polyimide and conductive particles. The polyimide includes ether linkages. Based on 100 weight parts of the polyimide, a total amount of monomer units including the ether linkages is 50 weight parts to 100 weight parts. Based on 100 weight parts of the dielectric layer, a total amount of the conductive particles is 10 weight parts to 70 weight parts. The conductive layer is disposed on a surface of the dielectric layer.

专利号:US-7381849-B1
优先权日:2004-07-23
标题:Synthesis of asymmetric tetracarboxylic acids and dianhydrides

专利号:US-11136286-B2
优先权日:2017-01-27
标题:Diamine compound, and polyimide compound and molded product using the same
发明人：GOSHIMA TOSHIYUKI; SOE WIN MAW
权利人:WINGO TECH CO LTD
摘要:[Problems to be solved] The present invention provides a novel diamine compound which allows for the synthesis of a polyimide compound having a high solubility in an organic solvent and a high melt moldability.[Solution] The diamine compound according to the present invention is characterized by being represented by the following general formula (1):(whereinR1 to R8 are each independently selected from the group consisting of a hydrogen atom, a fluorine atom, a substituted or unsubstituted alkyl group, and a substituted or unsubstituted aromatic group; and at least one of R1 to R8 is a substituted or unsubstituted aromatic group).

专利号:US-2016280858-A1
优先权日:2015-03-27
标 题:Synthesis of Copolyimides Containing Fluorine and Silicon Surface Modifying Agents