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RE31715 |
Liquid crystal compounds
Novel liquid crystal compounds are disclosed, which are chiral esters based upon the phenol ##STR1## Typical examples are: ##STR2## and mixtures of these compounds have a helical pitch such that...
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4478741 |
4-Alkylcyclohexyl 4-alkanoyloxybenzoate and liquid crystal composition thereof
A liquid crystal composition contains a compound of the formula: ##STR1## wherein R and R' are straight chain alkyl groups each having 1 to 7 carbon atoms.
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4462924 |
Liquid crystal materials and devices
A liquid crystal for use in liquid display devices comprises at least one material from group 1 comprising: ##STR1## at least one of the group 1 materials having n=2, or 4; and at least one...
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4455261 |
4-N-Alkylbenzoyloxy-3'-fluoro-4'-cyanobenzenes
A compound represented by the general formula ##STR1## wherein R represents a linear alkyl group having 1 to 10 carbon atoms.
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4452718 |
Pyridazines
Compounds of the formula ##STR1## wherein R 1 is straight-chain alkyl of 1 to 12 carbon atoms, R 2 is alkyl, alkoxy, p-alkylphenyl, p-alkoxyphenyl or trans-4-alkylcyclohexyl, and the alkyl and...
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4427569 |
Short length ester liquid crystal mixtures and process for making same
New nematic liquid crystal (LC) ester mixtures with relatively short average molecular lengths are made by including one or more binary sets of components which have identical, or nearly identical,...
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4419262 |
Pyridazines
Compounds of the formula ##STR1## wherein R 1 is straight-chain alkyl of 1 to 12 carbon atoms, R 2 is 1-alkynyl and the 1-alkynyl group in R 2 is a straight-chain group of 1 to 10 carbon atoms,...
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4410445 |
Liquid-crystalline dielectric having a steep characteristic curve
Liquid crystalline dielectrics having steep characteristic curves comprise 5-85% by weight of at least one carboxylic acid ester of formula (I) R 1 --X--R 2 ...
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4391730 |
Nematic liquid crystal compounds and use and device for using the same
A nematic liquid crystal for modulating light in electrooptical devices comprises: A. A 5-substituted-2-(4-substituted-phenyl)-pyrimidine of the formula ##STR1## or a homolog thereof, R 1 and R...
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4388453 |
Crosslinked organopolysiloxanes having liquid-crystalline properties
This invention relates to crosslinked organopolysiloxanes having liquid-crystalline properties in which mesogenic molecules are chemically bonded to the organopolysiloxane lattices. These...
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4385844 |
Novel compositions, devices and method
Disclosure is made of novel temperature sensing devices such as temperature indicating and recording devices. The devices of the invention differ from prior art devices in that they employ new and...
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4372871 |
Nematic liquid crystals for display devices
A nematic liquid crystal composition composed of (i) at least one compound of the general formula ##STR1## wherein R 1 represents n-C m H 2m +1, R 2 represents n-C q H 2q +1 -O, and m and q are...
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4363767 |
Esters of 4-[2,2-dicyano-ethenyl]-phenols
The invention relates to liquid-crystalline nematic mixtures which are used in electro-optical components, as well as to methods for their preparation. The object of the invention is...
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4358391 |
Compositions containing liquid crystal phases
Compositions having liquid crystal phases which contain at least one component consisting of an organopolysiloxane having mesogenic molecules chemically bonded thereto as side chains which are...
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4341652 |
Ester compounds, liquid crystal composition including same and method of production
Ester compounds suitable for use in liquid crystal compositions are provided. The ester compounds are (2'-chloro-4'-n-alkylphenyl)-3-cyano-4-n-alkoxybenzoates represented by the general formula:...
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4340498 |
Halogenated ester derivatives
New halogenated ester derivatives and liquid crystal compositions containing the same are provided. The derivatives are expressed by the general formula ##STR1## wherein X is ##STR2## R is 1-15C...
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4312773 |
Liquid crystal compositions
A liquid crystal composition comprising at least one of substituted bipheny-type and substituted terphenyl-type liquid crystal substances and at least one of substituted phenyl benzoate-type and...
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4296631 |
Liquid crystal compositions and devices
The disclosure is of a method of modifying the hysteretic behavior of liquid crystal compounds. The method is based on the discovery that there is a relationship between the hysteretic phenomena...
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4293435 |
Liquid-crystalline polymer phase having a cholesteric structure, processes for its preparation and its use
A liquid-crystalline polymer phase having an induced cholesteric structure comprises a component having a chiral structure and a component having a nematic structure and contains a polymer with...
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4279771 |
(2'-Cyano-4'-n-alkyl)phenyl-3-chloro-4-n-alkoxy benzoates and liquid crystal compositions thereof
A new ester compound suitable for use in a liquid crystal composition is provided. The compound is a (2'-cyano-4'-alkyl)phenyl-3-chloro-4 alkoxybenzoate represented by the following formula:...
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4257910 |
Liquid crystal of diester type exhibiting a smectic phase, with low frequency of dielectric isotropy, and display device utilizing this crystal
The invention concerns a substance of diester type, i.e. an organic compound with three benzene nuclei joined by --COO-- groups, exhibiting at least one mesomorphic phase of smectic type. The...
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4256656 |
Mesomorphous 4-alkoxytetrafluorobenzoic acid esters
The invention relates to an organic compound having an enantiotropic or monotropic mesomorphous phase. The compound according to the invention complies with the general chemical formula: ##STR1##...
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4222887 |
Liquid crystal composition
A liquid crystal composition comprising a mixture of at least one kind of liquid crystal substance represented by the following general formula (1) and at least one kind of compound selected from...
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4216109 |
Liquid crystal composition and method for making same
A new and novel liquid crystal composition having broad temperature and chemical stability is disclosed. The liquid crystal composition comprises a compound having the general formula: ##STR1## (R...
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4202791 |
Nematic liquid crystalline materials
Novel trans(equatorial-equatorial)1,4-disubstituted cyclohexane derivatives of the general formula ##STR1## wherein R represents a linear alkyl group containing 3 to 7 carbon atoms, and R'...
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4198312 |
3'-Chloro-4'-cyanophenyl 4-n-alkylbenzoates
Novel compounds of the formula ##STR1## wherein R represents a linear alkyl group containing 1 to 9 carbon atoms. When added to nematic liquid crystals for electro-optical display elements, these...
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4180475 |
Liquid crystal mixtures
Liquid crystal mixtures having positive anisotropy of the dielectric constants which comprise a nematogenic mixture with a clearing point above 60° C. which is doped with an organic solvent or...
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4162988 |
Biphenyl ester liquid crystal compounds
Novel compounds exhibiting liquid crystal properties have the formula: R-φ-φ-X-φ-R1, wherein R and R1 are, independently in each case, hydrogen or an alkyl, aryl, alkylaryl, arylalkyl, or...
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4158011 |
p'-Cyanophenyl ester of p-(β-alkoxy)ethoxybenzoic acid
A compound which is useful as one component of liquid crystal composition having superior practical properties and positive dielectric anisotropy is provided. Said compound is p'-cyanophenyl ester...
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4149413 |
Optically active liquid crystal mixtures and liquid crystal devices containing them
The present invention discloses chiral thermochromic liquid crystal mixtures which do not contain cholesterol or sterol residues.
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4147655 |
Liquid crystals with improved properties and devices using such liquid crystals
Novel mesomorphic substances, constituting, in certain temperature ranges, nematic or smectic liquid crystals, are compounds of the formula ##STR1## wherein Y is H or CN; R is alkyl or alkoxy of...
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4147651 |
Biphenyl based liquid crystal compositions
Nematic liquid crystal compositions containing 4'-substituted-4-cyanobiphenyl and 4, 4'-disubstituted phenyl benzoate liquid crystal compositions which can be actuated at low voltages, e.g., under...
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4147656 |
Mixtures of nematic liquid crystal materials
Liquid crystal mixtures are disclosed which contain 30-60% of a Schiff's base nematic liquid crystal compound, 25-65% of a second nematic liquid crystal compound selected from the classes of azoxy,...
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4143947 |
Method for improving the response time of a display device utilizing a twisted nematic liquid crystal composition
A method for improving the decay time of a display device utilizing a twisted nematic liquid crystal composition by the addition of a controlled amount of optically active material to produce a...
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4141853 |
Liquid crystal material
Liquid crystal material suitable for use in small display devices and consisting of one or more biphenyl or terphenyl compounds and one or more ester compounds, whereby low threshold voltage...
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4137192 |
Liquid crystalline composition
A liquid crystalline composition comprises at least one kind of biphenyl type liquid crystal materials having the positive dielectric anisotropy and at least one kind of other liquid crystal...
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4129983 |
Liquid crystal digital display electronic wristwatch
A liquid crystal digital display electronic wristwatch wherein the digital display is driven at the same potential as the remaining elements comprising the electronic wristwatch is provided. The...
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4128314 |
Liquid-crystal indicator
The present invention relates to a liquid-crystal indicator, wherein a layer of nematic liquid crystals is interposed between two transparent multi-layered blocks. Each of the multi-layered blocks...
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4128312 |
Long life reflective liquid crystal display for dc operation
Reflective mode dynamic scattering displays are disclosed which operate under dc excitation for extremely long hours with excellent contrast. These displays are the results of a combination of a...
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4120567 |
Electro-optic device
Liquid crystal mixtures of liquid crystalline esters, biphenyls and terphenyls have wide useful temperature ranges, fast response times and a small index of refraction anisotropy which can be...
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4110243 |
Alkylphenyl 3-cyano or fluoro-4-alkyloxybenzoates and mesomorphic mixtures thereof
An organic compound having a high negative dielectric anisotropy is capable, by mixing with a nematic liquid crystal, of improving the dynamic scattering effect of the liquid crystal. The organic...
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4103482 |
Wristwatch having a liquid crystal display
An ultra-thin wristwatch utilizes a liquid crystal display cell operable by a single electrochemical cell without the use of a voltage booster. Through the use of an extremely small piezoelectric...
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4101207 |
Preparation of liquid crystal containing polymeric structure
There is disclosed the preparation of a liquid crystal containing structure by incorporating a liquid crystal substance into a polymeric matrix so as to form a thin, layer-like structure of...
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4096086 |
Nematic liquid crystal composition
Nematic liquid crystal compositions consisting of compounds having high stability with respect to moisture-resistance, oxidation-resistance and light-resistance, complete transparency and a wide...
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4086002 |
Field effect light shutter employing low temperature nematic liquid crystals
A field effect liquid crystal light shutter employing low temperature nematic liquid crystals of the p-alkylphenyl-p'-akyl and alkoxy benzoate series.
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4083797 |
Nematic liquid crystal compositions
Nematic liquid crystal compositions for use in displays and in other liquid crystal applications comprising a mixture of a nematic biphenyl liquid crystal material, nematic liquid crystal material...
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4062798 |
Phenylpyrimidine derivatives
Compounds of the formula ##STR1## wherein when X is nitrogen, Y and Z are --CH--; or when Y is nitrogen, X and Z are --CH--; or when Z is nitrogen, X and Y are --CH--; and one of R 1 and R 2 is...
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4061587 |
Liquid crystalline cinnamic acid esters
Liquid crystalline alkylcinnamic acid p'-cyanophenyl esters, useful, for example, for electro-optical purposes, are described.
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4058478 |
Liquid crystal esters
Liquid crystal substances or compounds of the formula ##STR1## wherein R is as hereinafter set forth, AS WELL AS COMPOSITIONS AND ELECTRO-OPTICAL APPARATUSES CONTAINING THEM ARE DESCRIBED.
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4058476 |
Liquid crystalline isonitriles
Liquid crystal substances or compounds of the formula ##STR1## wherein X is ##STR2## and R is straight-chain alkyl, straight-chain alkoxy, straight-chain alkanoyloxy or p-alkyloxycarbonyloxy, As...
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