摘要:
The invention relates to thermochromic liquid crystalline phases with at least two components, characterized in that at least one component is an optically active compound of the formula I ##STR1## wherein R.sup.1 and R.sup.2 are each independently a chiral residue, importing to the phase a tight helical twist. ##STR2## denotes a 1,4-phenylene group optionally substituted by fluorine, X.sup.1 and X.sup.2 are each independently O or NH,n is 1, 2 or 3 andm is 0 or 1, which can be used in electro-optic devices, in temperature indicating devices or for color-changing cosmetics.
摘要:
This invention describes a method for the loading and alignment of elastomers in electro-optic and electro-active devices. It comprises the in-situ polymerization between substrates of liquid crystal monomers in the presence of cross-linking reagents. It also describes the production of free-standing elastomer films.
摘要:
The invention relates to dihalogenobenzene derivatives of the formula IR.sup.1 --A.sup.1 --Z.sup.1 --A.sup.2 --(Z.sup.2 --A.sup.3).sub.n --R.sup.2wherein R.sup.1, R.sup.2, A.sup.1, A.sup.2, A.sup.3, Z.sup.1, Z.sup.2 and n are as defined in the specification.
摘要:
2,3-difluorohydroquinone compounds of the formula I ##STR1## in which R.sup.1 and R.sup.2, in each case independently of one another, are alkyl having 1 to 15 C atoms or alkenyl having 3 to 15 C atoms which are unsubstituted, monosubstituted by cyano or at least monosubstituted by fluorine or chlorine, it also being possible for one CH.sub.2 group in these radicals to be replaced by --O--, --CO--, --CO--O--, --O--CO-- or --O--CO--O--,A.sup.1, A.sup.2 and A.sup.3, in each case independently of one another, are(a) trans-1,4-cyclohexylene, in which, in addition, one or two non-adjacent CH.sub.2 groups may be replaced by --O-- and/or --S--,(b) 1,4-phenylene, in which, in addition, one or two CH groups may be replaced by N, or(c) a radical from the group comprising piperidine-1,4-diyl, 1,4-bicylo (2,2,2)-octylene (sic), 1,3,4-thiadiazole-2,5-diyl, napththalene-2,6-diyl, decahydronaphthalene-2,6-diyl and 1,2,3,4-tetrahydronaphthalene-2,6-diyl, it being possible for the radicals (a) and (b) to be monosubstituted or polysubstituted by F, Cl, CH.sub.3 or CN,Z.sup.1 is --CO--O--, --O--CO--, --CH.sub.2 CH.sub.2 --, --OCH.sub.2 --, --CH.sub.2 O--, --C.tbd.C-- or a single bond,Q.sup.1 and Q.sup.2, in each case independently of one another, are --CO-- or --CH.sub.2 --,m and n are each 0, 1 or 2, and(m+n) is 0, 1 or 2,are suitable as components of liquid-crystalline phases.
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:
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:
Liquid crystal compositions comprising as a first part between 40 and 99% by weight in aggregate of one or more materials selected from one or more of the six compound classes (1) to (3'), wherein R is in every instance an alkyl chain containing between 2 and 18 carbon atoms and R' is in every instance an alkyl chain containing between 1 and 17 carbon atoms, wherein one or more non-adjacent CH.sub.2 -groups are replaced by oxygen atoms, and as a second part between 1 and 60% by weight of one or more materials of high birefringence and high positive dielectric anisotropy which raise the S.sub.A -N transition temperature, exhibit a smectic A phase of relatively low melting point and wide smectic range. Such compositions may be used in liquid crystal cells, not only in display or optical information processing applications, but also for instance in temperature sensing applications. The operation of such cells may involve laser addressing, thermal or electrical addressing. ##STR1##
摘要:
Mesogenic compounds with a .omega.-CF.sub.3 -alkyl, .omega.-CF.sub.3 -alkenyl or .omega.-CF.sub.3 -alkinyl terminal group of formula I ##STR1## with the meaning of R, Z, Q, ##STR2## m, n and o being indicated in claim 1.
摘要:
##STR1## Novel cyanohydrin derivatives of general formula (I) wherein R 1 is hydrogen, alkyl, alkoxy, perfluoroalkyl or perfluoroalkoxy, R 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 is 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:
A chiral, tilted, smectic liquid crystal phase comprising a mixture of at least two compounds, wherein at least one compound is an achiral fluorinated biphenyldiole compound of formula I ##STR1## whereinR.sup.1 and R.sup.2 are each independently alkoxy or alkanoyloxy with 1 to 15 C atoms, ##STR2## denotes a 4,4-phenylene group optionally substituted by up to four F atoms, and is 1.