Abstract: The present invention is to provide new diamino compounds useful for raw materials for production of liquid crystal aligning films that have excellent aligning properties and uniform and high pretilt angles over the whole display surface of wide substrates without afterimage phenomenons.

Abstract: A liquid crystal display device comprises a pair of substrates, a transparent electrode formed on each of the substrates, an orientation film covering the transparent electrode and a liquid crystal sealedly sandwiched between the pair of substrates, wherein the orientation film comprises a polyimide which is formed by a condensation polymerization of 2,2-bis[4-(4-aminophenoxy)phenyl]propane as an amine component and 1,2,4,5-benzenetetracarboxylic dianhydride as an carboxylic acid component, and is subjected to a uniaxial orientation treatment, and the liquid crystal has a smectic layer structure with its bending direction which is aligned with the direction of the uniaxial orientation treatment.

Abstract: The present invention is to provide diamino compounds useful to polyamide raw materials for production of liquid crystal alignment layers having excellent voltage holding ratios without development of image-sticking phenomena, a method for producing the compounds and liquid crystal display devices equipping the liquid crystal alignment layers.The Diamino compounds are represented by the general formula (1): ##STR1## wherein R indicates hydrogen or an alkyl group having 1 to 8 carbon atoms, further, X, Y and Z indicate hydrogen, an alkyl group having 1 to 3 carbon atoms or fluorine, respectively, and a part or all of them may be the same or different, and the positions of these substitutive groups may be ortho positions or meta positions.

Abstract: A liquid crystal alignment film and a liquid crystal display element are provided, according to which a phenomenon of afterimage is slight in the case of liquid crystal display elements of TN mode or STN mode, while a problem of printing phenomenon is solved and a good memory characteristic is obtained in the case of ferroelectric liquid crystal display elements,the liquid crystal alignment film and the liquid crystal display element being characterized in that at least one kind of compounds expressed by the following formula (2) or (3) is added into a liquid crystal alignment film consisting of a polyimide expressed by the following formula (1): ##STR1##

Abstract: The present invention provides a liquid crystal aligning film having a reduced after image and a good liquid crystal aligning property caused by a rubbing treatment of a thin film consisting of organics, and its liquid crystal display device.

Abstract: The present invention is to provide new diamino compounds useful for raw materials for production of liquid crystal aligning films that have excellent aligning properties and uniform and high pretilt angles over the whole display surface of wide substrates without afterimage phenomenons.

Abstract: A liquid crystal display device wherein an orientation film is formed from a polyimide which is obtained by polymerization of an amine of the formula (I) ##STR1## and 1,2,4,5-benzenetetracarboxylic acid dianhydride as main components and ferroelectric liquid crystals are oriented in liquid crystal cell using said orientation film.

Abstract: The present invention is to provide new diamino compounds useful for raw materials for production of liquid crystal aligning films that have excellent aligning properties and uniform and high pretilt angles over the whole display surface of wide substrates without afterimage phenomenons.

Abstract: The present invention is to provide diamino compounds useful to polyamide raw materials for production of liquid crystal alignment layers having excellent voltage holding ratios without development of image-sticking phenomena, a method for producing the compounds and liquid crystal display devices equipping the liquid crystal alignment layers.The Diamino compounds are represented by the general formula (1): ##STR1## wherein R indicates hydrogen or an alkyl group having 1 to 8 carbon atoms, further, X, Y and Z indicate hydrogen, an alkyl group having 1 to 3 carbon atoms or fluorine, respectively, and a part or all of them may be the same or different, and the positions of these substitutive groups may be ortho positions or meta positions.

Abstract: An improved liquid crystal-aligning coating composed mainly of a specified high molecule, mainly a polyether polyimide or a polyimide, and capable of controlling the alignment and pretilt angle of liquid crystals; a liquid crystal display element using the coating; and a dinitro compound and a diol compound each as an intermediate of a diamino compound constituting the polyimide ether, are provided, which specified high molecule contains in its molecular long chain, a substituted cyclohexylidene group or a cyclohexylidene group expressed by the formula ##STR1## wherein R.sub.1 to R.sub.6 of the cyclohexyl group each represent H, 1-15C alkyl group, a cyclohexyl group or a cyclohexyl group having 1-15C alkyl group, and may be each the same or partly or totally different.

Abstract: A liquid crystal-aligning film affording a high pretilt angle and capable of realizing a liquid crystal display for STN mode having a superior display quality and a liquid crystal display element including such film are provided,which film comprises as its main component, a polyimide having a structural unit expressed by the formula ##STR1## wherein R.sub.1 to R.sub.6 each are H or 1-22C alkyl and may be the same as or different from one another,Y is ##STR2## R.sub.7 to R.sub.14 ; each are H or 1-3C alkyl and may be the same as or different from one another and Ar is a tetravalent aromatic group.

Abstract: The present invention provides diamino compounds and liquid crystal aligning films comprising polyimides which are obtained from the said diamino compounds represented by the general formula: ##STR1## wherein R.sub.1 indicates an alkyl group having 3 to 22 carbon atoms, R.sub.2 indicates a hydrogen atom or an alkyl group having 1 to 22 carbon atoms, and R.sub.3 -R.sub.10 indicate a hydrogen atom or a methyl group, respectively.The liquid crystal aligning films are useful for STN mode display cells in realizing a high pretilt angle.

Abstract: A novel diamino compound and a dinitro compound and a diol compound as its derivatives are provided,which diamino compound is useful as a raw material for polyimide compounds for an aligning film in a liquid crystal display element exhibiting a high pretilt angle, and expressed by the formula ##STR1## wherein R.sub.1 to R.sub.6 each are H or 1-22C alkyl and may be the same as or different from one another, and R.sub.7 to R.sub.14 each are H or 1-3C alkyl and may be the same as or different from one another.

Abstract: Diamino compounds, dinitro compounds, diol compounds and a process for preparing the diamino compounds which are useful as materials of poly-imide compounds for obtaining aligning films having high pretilt angles in liquid crystal display elements are provided.The diamino compounds are represented by the general formula: ##STR1## wherein R.sub.1 -R.sub.6 are a hydrogen atom or an alkyl group having 1 to 22 carbon atoms, respectively, and R.sub.7 -R.sub.12 are a hydrogen atom, an alkyl group having 1 to 3 carbon atoms, F or Cl respectively.

Abstract: The present invention provides diamino compounds and liquid crystal aligning films comprising polyimides which are obtained from the said diamino compounds represented by the general formula: ##STR1## wherein R.sub.1 indicates an alkyl group having 3 to 22 carbon atoms, R.sub.2 indicates a hydrogen atom or an alkyl group having 1 to 22 carbon atoms, and R.sub.3 -R.sub.10 indicate a hydrogen atom or a methyl group, respectively.The liquid crystal aligning films are useful for STN mode display cells in realizing a high pretilt angle.