DINITROXIDE-TYPE BIRADICAL COMPOUNDS OPTIMIZED FOR DYNAMIC NUCLEAR POLARIZATION (DNP)
申请人:OUARI Olivier
公开号:US20100249386A1
公开(公告)日:2010-09-30
The present invention relates to the field of organic chemistry and in particular to organic free radicals used as polarizing agents in the technique of Dynamic Nuclear Polarization (DNP), which involves transferring the polarization of electron spins to the nuclei of a compound whose Nuclear Magnetic Resonance (NMR) is being observed. It concerns dinitroxide-type biradical polarizing agents characterized by a rigid linkage between the nitroxide units that enables optimal orientation and distance to be maintained between the aminoxyl groups of said nitroxide units. This particular structure enables, at low temperatures and high fields, optimal transfer of polarization and optimal enhancement of NMR/MAS signals of the polarized nuclei of the compound studied.
Polymers containing polyalkylpiperidines and use thereof as stabilizers
申请人:SANKYO COMPANY LIMITED
公开号:EP0000769A2
公开(公告)日:1979-02-21
Polymers containing polyalkylpiperidines and use thereof as stabilizers for synthetic polymer compositions are described. In said polymers, sterically hindered polyalkylpiperidines are linked in the main chain via bridging members containing 2-hydroxy-1,3-trimethylene groups, or derivatives thereof. The polymers are distinguished by an improved stabilizing effect in various synthetic polymer compositions, such as polyolefins, against light- and/or heat-induced deterioration thereof. The polyaikylpiperidine-containing polymers of the invention are hardly volatile upon heat- processing or during storage of shaped articles containing said polymers, and are resistant to extraction with solvents.
Verbindungen, die mindestens eine Gruppe der Formel I enthalten,
worin X eine Gruppe ist, die den Ring zu einem Piperidinring ergänzt, sind wirkungsvolle Stabilisatoren für organische Materialien gegen Schädigungen durch Licht, Sauerstoff und Hitze.
至少含有一个式 I. 基团的化合物
其中 X 是使环完整形成哌啶环的基团,可有效稳定有机材料,使其免受光、氧和热的破坏。
N-substituted hindered amine stabilizers
申请人:CIBA-GEIGY AG
公开号:EP0309402B1
公开(公告)日:1995-01-11
LIQUID CRYSTAL COMPOSITION AND LIQUID CRYSTAL DISPLAY DEVICE INCLUDING THE SAME
申请人:DIC Corporation
公开号:US20180208846A1
公开(公告)日:2018-07-26
There are provided a liquid crystal composition containing one or two or more compounds represented by the general formula (I) and a liquid crystal display device including the liquid crystal composition. A liquid crystal composition containing a compound represented by the general formula (I) has high dielectric constant anisotropy and low viscosity and is of great practical use as a liquid crystal composition for liquid crystal displays. A liquid crystal display device including a liquid crystal composition according to the present invention has a high contrast, high-speed responsivity, high light resistance, and a lower occurrence of image sticking and display defects, and is effective for higher-speed response and high-quality reliability.