Dainippon Ink and Chemicals, Incorporated

Other

Dic Corporation

Nkk Corporation

The Hong Kong University of Science and Technology

Hirokazu Takada

Vladimir Grigorievich Chigrinov

Masanobu Fukuda

Hoi Sing Kwok

Hoi-Sing Kwok

Yasuhiro Kuwana

Hitoshi Kondo

Hitoshi Hayakawa

Sadaaki Shigeta

Wing Chiu Yip

Elena Karlovna Prudnikova

Vladimir Kozenkov

Michihiro Kono

Sadaaki Sigeta

Vladimir Grigorievich; Chigrinov

Hoi-Sing; Kwok

An azo compound of the present invention is represented by the general formula (1): (wherein, Rand Reach independently represents a hydroxy group, or a polymerizable functional group selected from the group consisting of a (meth)acryloyl group, a (meth)acryloyloxy group, a (meth)acrylamide group, a vinyl group, a vinyloxy group, and a maleimide group; Xrepresents single bond when Ris a hydroxy group and represents a linking group represented by -(A-B)- when Ris a polymerizable functional group; Xrepresents a single bond when Ris a hydroxy group and represents a linking group represented by -(A-B)- when Ris a polymerizable functional group; Rand Reach independently represents &#x2014;OR, a hydroxyalkyl group having 1 to 4 carbon atoms, or &#x2014;CONRR; and Rand Reach independently represents a carboxy group, a sulfo group, a nitro group, amino group, or a hydroxy group).

Azo compound, composition for photo-alignment film using the same, and method for producing photo-alignment film

The present invention provides a photo-alignment layer for a liquid crystal display device, which has good liquid crystal display device characteristics such as a good voltage holding ratio and also has good alignment stability and sufficient resistance to light and heat. The photo-alignment layer is manufactured by coating a polymerizable monomer having at least one photo-alignment moiety, which carries out a photo-alignment function by the photo dimerization reaction, and at least two polymerizable maleimide groups per molecule on a substrate, and exposing the coating layer to light to cause the photo dimerization reaction of the structural unit and the photopolymerization reaction of the polymerizable maleimide group, thereby to form a crosslinked polymeric layer and to enable the polymeric layer to carry out the photo-alignment function.

Material for photo-alignment layer, photo-alignment layer and method of manufacturing the same

A photo-alignment layer having excellent long-term stability to light and heat is manufactured by coating a material for the photo-alignment layer, which contains a dichroic dye having two or more polymerizable groups per molecule, on a substrate, and exposing the coating layer to polarized light, thereby imparting a photo-alignment function, and polymerizing the polymerizable groups by heating or light exposure.

Method of manufacturing photo-alignment layer

An optical recording medium of the type whereby information is recorded and reproduced by utilizing a change of the reflectance of an irradiated portion, caused by irradiating a recording film formed on a substrate with laser beams is described. The recording film in this optical recording medium has a three-layer structure comprised of a layer containing at least tin and selenium and layers of a passive state-forming metal or an oxide thereof, contiguous to both sides of said layer containing tin and selenium. A film of a phthalocyanine compound having a light transmission of at least 80% at a wavelength of 770 to 850 nm is disposed between the recording film and the substrate.

Optical recording medium

An optical recording medium is disclosed, which has a substrate and a recording film formed on the substrate. The recording film has a film comprising tin as the main component and passive state-forming metal layers formed on both sides of the tin film. The optical recording medium has a high recording sensitivity, a good signal quality and a high reliability. The optical recording medium is prepared by forming a first passive state-forming metal layer, a film comprising tin as the main component and a second passive state-forming metal layer in sequence on a substrate, and preferably heating the thus-obtained laminate.

Growing community of inventors

Sakura, Japan

Hirokazu Takada