发明授权
US5130049A Thermochromic esters 失效
热变性糖

Thermochromic esters
摘要:
The invention relates to liquid crystalline compounds of the Formula I ##STR1## wherein R.sup.1, R.sup.2, X.sup.1, X.sup.2, m, and n are as defined herein. Preferably, the group R.sup.2 of the liquid crystalline compounds of Formula I is a chiral residue of the formula II ##STR2## wherein Q denotes an alkylene residue with up to 7 C atoms wherein one CH.sub.2 group may be replaced by --O--, --CO--O--, or --O--CO--, or a single bond; andY denotes an alkyl residue with 2 to 7 C atoms wherein one CH.sub.2 group may be replaced by --O--, --CO--O--, or --O--CO--.The invention further relates to liquid crystal phases containing compounds of the Formula I, to electro-optic and thermographic devices, and to a method of surface thermography.
信息查询
0/0