Process for producing ferroelectric liquid-crystal cells with oleophilic additive employing heat and low pressure overlapped a short time

US5430564A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Takamasa Harada · Oberursel, DE
• Claus Escher · Mühltal, DE
• Gerhard Illian · Frankfurt am Main, DE
• Dieter Ohlendorf · Liederbach, DE
• Heinz Rieger · Hofheim, DE
• Norbert Rosch · Frankfurt am Main, DE

Key dates

• Filing date: Feb 5, 1993
• Grant date: Jul 4, 1995
• Expiry date: Feb 5, 2013

Classification

• Technology area (CPC G): Physics
• CPC primary: G02F1/1341
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A process for producing a liquid-crystal cell by using a ferroelectric liquid crystal (FLC) composition containing at least one oleophilic substance that exhibits liquid crystallinity and at least one additive having lower boiling point than said substance, characterized in that said FLC composition is charged into the cell under high-temperature and high-vacuum conditions, provided that the two conditions will not overlap, or will overlap for a sufficiently short time to effectively prevent the evaporation of said additive.