会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 3. 发明授权
    • Process for preparing essentially colorless polyimide film containing
phenoxy-linked diamines
    • 制备基本上无色的含苯氧基连接的二胺的聚酰亚胺膜的方法
    • US4595548A
    • 1986-06-17
    • US643524
    • 1984-08-23
    • Anne K. St. ClairTerry L. St. Clair
    • Anne K. St. ClairTerry L. St. Clair
    • C08G73/10C08J3/09C08J5/18
    • C08J5/18C08G73/1028C08J3/091C08J2379/08
    • An aromatic condensation polyimide film that is approximately 90% transparent at 500 nm, useful for thermal protective coatings and the like, and the processes for preparing same by thermal and chemical conversion are disclosed. An essential feature of the invention for achieving maximum optical transparency films requires utilizing recrystallized and/or sublimated specific aromatic diamines and dianhydride monomers and introducing phenoxy or thiophenyl separator groups and isomeric m,m'- or o,p'-oriented diamines into the polymer molecular structure. The incorporation of these groups in the polymer structure serves to separate the chromaphoric centers and reduce the formation of inter-chain and intra-chain charge transfer complexes which normally cause absorptions in the UV-visible range. The films may be obtained by hand, brushing, casting or spraying a layer of the polyamic acid solutions onto a surface and thermally converting the applied layer to the polyimide or the polyamic acid solution can be chemically converted to the polyimide, subsequentially dissolved in an organic solvent, and applied as a polyimide film layer with the solvent therein thermally removed.
    • 公开了一种在500nm下约90%透明度的用于热保护涂层等的芳族缩合聚酰亚胺膜及其通过热和化学转化制备方法。 本发明实现最大光学透明膜的本质特征需要使用重结晶和/或升华的特定芳族二胺和二酐单体,并将苯氧基或噻吩基隔离基和异构体m,m'-或o,p'-取向的二胺引入聚合物 分子结构。 这些基团在聚合物结构中的引入用于分离色盲中心并减少通常在UV-可见光范围内引起吸收的链间和链内电荷转移络合物的形成。 可以通过手工,刷涂,浇铸或将一层聚酰胺酸溶液喷涂到表面上并将所施加的层热转化为聚酰亚胺或聚酰胺酸溶液而将聚合物化学转化为聚酰亚胺,随后溶解在有机 溶剂,并作为聚酰亚胺膜层施加其中热溶解的溶剂。
    • 5. 发明授权
    • Structures from low dielectric polyimides
    • 低介电聚酰亚胺的结构
    • US5338826A
    • 1994-08-16
    • US954108
    • 1992-09-28
    • Anne K. St. ClairTerry L. St. ClairWilliam P. Winfree
    • Anne K. St. ClairTerry L. St. ClairWilliam P. Winfree
    • C08G73/10B05D5/06B32B27/00
    • C08G73/1007Y10T428/31681Y10T428/31721
    • A structure which is effective as an electrical insulator or as a transmitter-receiver of electromagnetic energy is prepared by providing a suitable substrate and covering the substrate with an adhering layer of a low dielectric, high temperature, linear aromatic polyimide. This polyimide is prepared by:(1) selecting aromatic diamine and aromatic dianhydride reactants to meet at least two of the following three conditions:(a) a reactant must have minimal permanent or inducible electrical dipolar characteristics as a result of the presence of pendant or bridging groups therein;(b) a reactant must impart a high degree of free volume to the polymer caused by inefficient chain packing therein in the solid state as a result of the presence of pendant or bridging groups therein; and(c) a reactant must have fluorine atoms chemically attached thereto; and(2) chemically combining equimolar quantities of the aromatic diamine and aromatic dianhydride reactants in a solvent to form a high molecular weight polyamic acid solution, and converting the high molecular weight polyamic acid to the corresponding low dielectric, high temperature linear aromatic polyimide.
    • 作为电绝缘体或作为电磁能的发射器 - 接收器有效的结构通过提供合适的衬底并用低电介质,高温线性芳族聚酰亚胺的粘附层覆盖衬底来制备。 该聚酰亚胺通过以下方法制备:(1)选择芳族二胺和芳族二酐反应物以满足以下三个条件中的至少两个:(a)反应物必须具有最小的永久或可诱导的电偶极特性,这是由于存在侧基或 桥接基团; (b)由于在其中存在侧基或桥连基团,反应物必须赋予聚合物在固态中由于无效的链填料而导致的高度的自由体积; 和(c)反应物必须具有化学连接的氟原子; 和(2)将等摩尔量的芳族二胺和芳族二酐反应物在溶剂中化学组合以形成高分子量聚酰胺酸溶液,并将高分子量聚酰胺酸转化为相应的低电介质,高温线性芳族聚酰亚胺。