α,α-Bis(trifluoromethylbenzyl)triflates offer a convenient access to the corresponding amines through SN1 type reactions.
α,α-双(三氟甲基苄基)三氟甲磺酸酯可通过S N 1型反应方便地获得相应的胺。
.alpha.-fluoroacrylic acid esters and polymers thereof
申请人:Hoechst Aktiengesellschaft
公开号:US05198925A1
公开(公告)日:1993-03-30
Esters of .alpha.-fluoroacrylic acid are accessible by hydrolysis of an .alpha.-hydroxymethyl-.alpha.-fluoromalonic acid ester, decarboxylation and dehydration of the hydrolysis product and subsequent esterification of the resulting .alpha.-fluoroacrylic acid with an alcohol. The esters are polymerizable and are suitable for use as a starting material for preparing fluoropolymers which in turn are usable as materials for manufacturing transparent articles. The polymers are high-molecular and non-crystalline and have softening temperatures of above 100.degree. C.
Shaped articles of graduated refractive index exhibiting low dispersion
申请人:HOECHST CELANESE CORPORATION
公开号:EP0606598A2
公开(公告)日:1994-07-20
A monolithic, thermoplastic article with a continuously graded refractive index is formed by polymerizing a fluorinated matrix polymer in the presence of a low molecular weight, substantially unreactive guest molecule of different refractive index than the matrix polymer. The thermoplastic articles may be used to produce shaped articles such as optical waveguides, fibers or lenses of low attenuation and high bandwidth.
[EN] TRANSPARENT THERMOPLASTIC MOULDING MATERIAL CONSISTING OF ESTERS OF 2,3-DIFLUORACRYLIC ACID
申请人:HOECHST AKTIENGESELLSCHAFT
公开号:WO1990012040A1
公开(公告)日:1990-10-18
(DE) Eine thermoplastische Formmasse, die aus Einheiten von 2,3-Difluoracrylsäureestern oder ihren deuterierten Derivaten besteht oder Einheiten aus diesen Estern enthält, zeichnet sich durch eine hohe Glasübergangstemperatur und eine hohe Lichtdurchlässigkeit aus. Sie eignet sich deswegen für die Herstellung von Lichtwellenleitern für große Übertragungslängen und hohe Dauergebrauchstemperaturen.(EN) A transparent thermoplastic moulding material consisting of units of esters of 2,3-difluoracrylic acid or their deuterized derivatives is characterized by a high glass transition temperature and high transparency. It is therefore suitable for the manufacture of beam waveguides for use over high transmission lengths and at high continuous service temperatures.(FR) Une matière de moulage thermoplastique transparente composée d'unités d'acrylates de 2,3-difluor ou de leurs dérivés deutérisés est caractérisée par une température de transition vitreuse élevée et une transparence exceptionnelle. Elle convient donc particulièrement à la fabrication de guides d'ondes lumineuses s'utilisant sur de grandes longueurs de transmission et à des températures élevées en service continu.