摘要:
An improved ink comprising a thermochromic liquid crystalline media comprising at least one optically inactive nematic component and at least one optically active component, the improvement wherein the optically active component comprises at least one menthol derivative of formula I ##STR1## wherein ##STR2## is 1,4-phenylene optionally substituted by up to 4 methyl group and/or halogen atoms, particularly fluorine atoms or is 1,4 cyclohexylene and MG is a mesogenic group, or forms a mesogenic group together with ##STR3##
摘要:
Disclosed are compounds of formula I ##STR1## wherein R is C.sub.1-12 -alkyl or halogenoalkyl wherein one or two non-adjacent CH.sub.2 groups are optionally replaced by --O--,A is ##STR2## Q is a bivalent radical of formula (2), and L.sup.0, L.sup.1 and L.sup.2 are each independently H or F, with the proviso that at least one of L.sup.0, L.sup.1 and L.sup.2 present in the molecule denotes F.
摘要:
Disclosed are liquid crystal compounds of formula IR.sup.1 --P--X--(A.sup.1 --Z.sup.1).sub.n --A.sup.2 --R.sup.2 IwhereinR is ##STR1## W is H, Cl or C.sub.1-5 -alkyl, and m is 1-7,P is C.sub.1-12 alkylene, one or more CH.sub.2 groups optionally being replaced by O,X is --O--, --S--, --COO--, --OCO-- or a single bond,R.sup.2 is C.sub.1-15 -alkyl optionally substituted by halogen, one or more CH.sub.2 groups optionally replaced by --O--, --S--, --CO--, --O--CO--, --CO--O-- or --O--CO--O--; R.sup.1 --P--X, CN, F, Cl or --V--Q--T,V is --O--, --S-- or a single bond,Q is --CH.sub.2 --, --CHF--, --CF.sub.2 --,T is F or Cl,n is 1 or 2,A.sup.1, A.sup.2 are 1,4-phenylene optionally substituted by F, Cl, CN or --W--C.sub.r H.sub.s F.sub.2r+1-s, or one of A.sup.1 or A.sup.2 is ##STR2## pyrimidine-2,5-diyl or pyrimidine-2,5 diyl, Z.sup.1 is --CO--O--, --O--CO--, --CH.sub.2 CH.sub.2 -- or a single bond,r is 1 or 2,s is O, 1, 2, 3, 4, or 5,W is a single bond, --O--, --S-- or --CO--,with the provisos (i) that at least one of A.sup.1 and A.sup.2 is a 1,4-phenylene group which is mono-or polysubstituted by Cl, CN or --W--C.sub.r H.sub.s F.sub.2r+1-s, said substituted 1,4-phenylene group optionally additionally substituted by one or more F-atoms, and (ii) that in case n=2 (a) only one of Z.sup.1 is --COO-- or --OCO-- or (b) at least one of A.sup.1 and A.sup.2 is double substituted or (c) at least two of A.sup.1 and A.sup.2 are substituted.
摘要:
The invention relates to chlorobenzene derivatives of formula I ##STR1## wherein R.sup.1 denotes an alkyl residue with up to 12 carbon atoms wherein one or two non-adjacent CH.sub.2 -groups may also be replaced by --O--, --O--CO--, --CO--O-- and/or --CH.dbd.CH--.
摘要:
The invention relates to a liquid-crystalline medium based on a mixture of polar compounds of positive dielectric anisotropy, characterized in that it contains one or more compounds of the general formula I ##STR1## in which L is H or F, X is F, Cl, CF.sub.3, OCF.sub.3 or OCHF.sub.2, and R is alkyl, oxaalkyl, fluoroalkyl or alkenyl, in each case having up to 7 carbon atoms.
摘要:
Phenyldioxanes of the formula I ##STR1## wherein R.sup.1 is an alkyl or alkenyl residue each with up to 16 C atoms, wherein one or two non-adjacent CH.sub.2 groups of these residues may be replaced by --CO--O-- or --O--CO--,Q.sup.1 and Q.sup.2 are each independently ##STR2## L.sup.1 and L.sup.2 are each independently F or H, and Y is Cl, F, CN, CF.sub.3, OCF.sub.3 or OCF.sub.2 H,m and n is 0 or 1,are suitable as components of liquid crystal media.
摘要:
Chiral, tilted, smectic liquid-crystal phases containing at least two liquid-crystal components and at least one chiral doping agent, at least one liquid-crystal component being a compound having the structural unit 2,3-difluoro-1,4-phenylene, are distinguished by a very low viscosity and advantageous switching times.
摘要:
Novel cyanohydrin derivatives of general formula (I) wherein R.sup.1 is hydrogen, alkyl, alkoxy, perfluoroalkyl or perfluoroalkoxy, R.sup.2 is alkyl, r is 1 to 10, n and m are 0 or 1, provided if both n and m are 0 then X is (II) or (III), where (F) indicates one or more optional fluorines, p is 0 or 1, Z is a single bond if p is 0 and COO if p is 1; and if one or both of n or m are 1 then X is (IV), where each ring A, B and C is phenyl, fluoro- or chloro-phenyl, cyclohexyl, pyrimidyl, pyridyl, or dioxanyl, A, B and C are single bonds or linking groups, and (a+b+c) is 2 or 3. Liquid crystal materials containing these compounds are also described.
摘要:
Novel lactic acid derivatives which may be used as a component of a ferroelectric smectic liquid crystal mixture, which derivatives have the general formula: ##STR1## in which R.sub.1 is alkyl or alkoxy and R.sub.2 is alkyl. Liquid crystalline compositions containing these compounds are also described.
摘要:
A heavy duty wheeled trailer for use in towing the trailer behind a vehicle. The trailer includes an adjustable height tow connection point to adjust and connect to different types of tow vehicles while maintaining the front deck substantially parallel to the trailer main deck. The trailer further includes a modular support frame allowing the trailer to be easily scaled in length and performance capabilities through removal or addition of modular frame cells.