The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 04, 1985
Filed:
Feb. 03, 1983
Dietrich Demus, Halle, DD;
Hans-Matthias Vorbrodt, Quedlinburg, DD;
Anton Hauser, Wettin, DD;
Jorg Vogel, Biesenthal, DD;
Horst Zaschke, Halle, DD;
Abstract
The invention relates to nematic liquid crystals, especially for electro-optical components for the modulation of transmitted or reflected light, as well as for the display of numbers, symbols and images, exhibiting favorable physical characteristics, as well as to a method for the production of the new substances. It has been found that new liquid crystal 2-substituted-1,3-dioxane-5-carboxylic acid esters of the general formula ##STR1## are suited for use in electro-optical components for the modulation of the light, as well as for the display of numbers, symbols and images, and can be used alone, in mixtures with each other and/or in mixtures with additional liquid crystal or non-liquid crystal substances. In the method for the production of the new liquid crystal trans-2-substituted-1,3-dioxane-5-carboxylic acid esters, 2-substituted-1,3-dioxane carboxylic acids, with halogen donors such as thionyl chloride, sulfuryl chloride or phosphoric halides, preferably in the absence of organic bases, are converted into the corresponding acid chlorides, which are subsequently esterified in well-known fashion with alcohols or substituted phenols.