Optical switch element comprising a liquid-crystalline medium

摘要

The present invention relates to an optical switch element, comprising a liquid-crystalline medium for the temperature-dependent regulation of radiant energy flow. The invention furthermore relates to the use of the optical switch element for the regulation of radiant energy flow between interior spaces and the environment and for the regulation of the temperature of interior spaces. The invention furthermore relates to a liquid-crystalline medium, characterized in that it comprises 5-95% of a compound of the formula (I), in particular for use in the optical switch elements according to the invention.

主权项

1. A thermoresponsive optical switch element comprising a liquid-crystalline medium, which comprises one or more compounds of formula (I-1) where R11, R12 is, identically or differently, an alkyl or alkoxy group having 1 to 10 C atoms or an alkenyl or alkenyloxy group having 2 to 10 C atoms, in any of which one or more H atoms are optionally replaced by F or Cl and in which one or more CH2 groups are optionally replaced by O or S, or are selected from the group consisting of F, Cl, R13—O—CO— and R13—CO—O—; R13 is, identically or differently, an alkyl group having 1 to 10 C atoms, in which one or more H atoms are optionally replaced by F or Cl and in which one or more CH2 groups are optionally replaced by O or S; which switch element is capable of a temperature-dependent regulation of radiant energy flow between an interior space and the environment; and which switch element has a switching temperature of between 20 and 50° C.