Mitsubishi Chemical Industries Limited

Hitachi, Ltd.

Mitsubishi Chemical Corporation

Mitsubishi Kasei Corporation

Sony Corporation

Tetsuo Ozawa

Masaharu Kaneko

Akio Mukoh

Shuji Imazeki

Mikio Sato

Konoe Miura

Tomio Yoneyama

Shuichi Maeda

Yutaka Kurose

Seigo Okumura

Seiichi Imahori

Junko Iwanami

Shinji Kubo

Yukichi Murata

Tetsuya Morita

Toshio Niwa

Tetsuo Murayama

Tetsuo Urabe

Teruo Kitamura

Mamoru Nozomi

Kozo Ishio

Tomomi Nakano

Yukinari Haraguchi

Akio Mukoo

Hiroe Kizaki

Kunihiko Arai

Junko Kanaya

Hisayo Hosokai

Keiko Yoneyama

Noriyuki Okabe

Hidetoshi Urashima

Diphenylsquarylium compound and filter for display containing the same

Electrophotographic photoreceptor

Squarylium compounds, filters for plasma display panels employing them, and plasma display panel devices

Squarylium dye and filter for display device

A light modulating device comprising a pair of electrode substrates having supported therebetween an electrically light modulating material containing a liquid crystal and a polymer, in which said light modulating material further contains (1) a combination of a dichroic dye having a maximum absorption in the wavelength region of from 400 to 489 nm, a dichroic dye having a maximum absorption in the wavelength region of from 490 to 559 nm, and a dichroic dye having a maximum absorption in the wavelength region of from 560 to 699 nm and/or (2) a near infrared- to infrared-absorbing dichroic dye having a maximum absorption in the wavelength region of 700 nm or more. The light modulating device exhibits high performance in controlling transmission of visible to infrared light and a high contrast between 'on' and 'off' states.

Light modulating device including a liquid crystal, a polymer and

A novel azo compound, which has a high dichroic ratio as well as a high solubility in liquid crystals, and a liquid crystal composition containing the same as disclosed. The liquid crystal composition enables an excellent and clear color display.

Azo compound and liquid crystal composition containing the same

A squarilium compound represented by the following formula (I) and a liquid crystal composition containing the same are disclosed: ##STR1## wherein X and Y each represents ##STR2## wherein R.sup.1 represents a hydrogen atom, an alkyl group, a substituted or unsubstituted aryl group or a substituted or unsubstituted aralkyl group; R.sup.2, R.sup.3 and R.sup.4 each represents a hydrogen atom, an alkyl group or a substituted or unsubstituted alkoxy group; R.sup.5 represents a hydrogen atom, an alkyl group, an aralkyl group or an aryl group; ring A represents a cyclic alkylene; ring B represents a substituted or unsubstituted aromatic ring; and ring C represents a heterocyclic ring containing one or two of a nitrogen atom, an oxygen atom and a sulfur atom; with proviso that X and Y are not the same when either one of them represents ##STR3## and a liquid crystal composition containing the squarilium compound of the formula (I). The squarilium compound (I) are soluble in a wide variety of solvents and resistant to light, and their maximum absorption wavelengths in these solvents are in the ranges of from 700 to 900 nm.

Squarilium compound and liquid crystal composition containing the same

A guest-host type liquid crystal composition comprising one or more host liquid crystals and dissolved therein one or more pleochroic dyes having a trans-4-substituted cyclohexyl group, preferably in an amount of 70% by mole or more of said trans-4-substituted cyclohexyl group among 4-substituted cyclohexyl groups, can afford a liquid crystal display device improved in display contrast and good stability due to no photochemical reaction of the liquid crystal composition.

Guest-host type liquid crystal composition

A liquid crystal display device of the type in which thermo-writing is performed by means of irradiation of laser beams, the display device including a laser-sensitive liquid crystal composition exhibiting a maximum absorption at or near the wavelength of the impinging laser beam with which the display device is to be used. The specific improvement of the present invention comprises including in the liquid crystal composition at least two types of laser-responsive dyes, each being present in an amount less than its solubility limit in the liquid crystal composition, and each of the dyes evidencing a maximum absorption at or near the wavelength of the laser beam. In an embodiment, the dyes are chosen from the class of squarilium dyes.

Liquid crystal display device

An anthraquinone type compound which is represented by the following general formula (I) and which exhibits yellow to orange-colored hue; and a composition for liquid crystal display element obtained by dissolving the compound into liquid crystal: ##STR1## (where: X.sup.1 and X.sup.2 denote sulfur or selenium; and R.sup.1 and R.sup.2 represent a substituted or unsubstituted phenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted pyridyl group, a substituted or unsubstituted pyrmidyl group or a tetrahydronaphthyl group, with the following exceptions:

Anthraquinone type compound and liquid crystal composition containing

A liquid crystal composition suitable for a guest-host liquid crystal device and the composition comprises a solution of a liquid crystal substance and a pleochroic dye which comprises at least one azo type compound having the formula (I), ##STR1## wherein R.sup.1 represents a hydrogen atom, an alkyl group or an alkoxy group each of which may be substituted by an alkoxy or an aryl group; a cyclohexyl group which may be substituted by an alkyl group; or --COOR.sup.3 (wherein R.sup.3 represents an alkyl group which may be substituted by an alkoxy group, a cyclohexyl group which may be substituted by an alkyl group, or an aryl group which may be substituted by an alkoxy or an alkyl group);

Liquid crystal composition containing a pleochroic azo type compound

An anthraquinone compound represented by formula: ##STR1## wherein R and X are as defined in the specification, and a polarizing film containing the same. The anthraquinone compound exhibits satisfactory compatibility with organic polymers and high dichroism, and the polarizing films have excellent performance characteristics.

Anthraquinone compounds and polarizing film containing the same

Cyclic imido anthraquinone compounds

A polarizing film which comprises a film base having thereon an anthraquinone dye of general formula (I): ##STR1## wherein R.sup.1 and R.sup.2 each represents a hydrogen atom, an alkyl group, an alkoxy group, an aralkyloxy group, an aryl group, a cyclohexyl group, a 4-alkylcyclohexyl group, a carboxylic acid ester group, a carboxylic acid amide group, a halogen atom, ##STR2## X represents an oxygen atom, a sulfur atom or an amino group.

Polarizing film: polymer film base containing substituted anthraquinone

Optical recording member

Growing community of inventors

Kanagawa, Japan

Tetsuo Ozawa