Smectic liquid-crystal mixture

US5529718A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Barbara Hornung · Hasselroth, DE
• Dietmar Jungbauer · Weiterstadt, DE
• Javier Manero · Frankfurt, DE

Key dates

• Filing date: Jul 20, 1994
• Grant date: Jun 25, 1996
• Expiry date: Jul 20, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K19/3469
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A smectic liquid-crystal mixture containing rod-shaped molecules having only one side chain and certain phenylpyrimidine derivatives. The liquid-crystal mixtures according to the invention are distinguished by a low melting point and a high S.sub.C /S.sub.A phase-transition temperature. The use of bisesters of the formula I allows the number of phenylpyrimidine derivatives in the mixtures according to the invention to be significantly reduced. Ferroelectric mixtures according to the invention have, in particular, high contrast, good alignment, a large margin, low flicker and a large angle in the chevron geometry.