Nippon Telegraph and Telephone Public Corporation

Hitachi, Ltd.

Nippon Telegraph and Telephone Corporation

Shungo Sugawara

Saburo Imamura

Toshio Watanabe

Saburo Nonogaki

Shinkichi Horigome

Shoichi Hayashida

Michiyuki Amano

Hirotsugu Sato

Mitsuo Usui

Yoshio Hatano

Mitsutoshi Hoshino

Masami Kakuchi

Kei Murase

Akira Terada

Kentaro Matsuyama

A polymeric optical material which is a mixture of a polysiloxane and at least one compound selected from the group consisting of polyisocyanate, silane, alkoxide and chelate, and an optical waveguide fabricated from the polymeric optical material having high thermal stability and low propagation loss over wide range. The polysiloxane may have, for example, a repeating unit of following formula (I): ##STR1## wherein each of R.sub.1 and R.sub.2 is independently an alkyl, deuterated alkyl or halogenated alkyl group, or a phenyl, deuterated phenyl or halogenated phenyl group. The optical waveguide includes a substrate, a clad layer provided on the substrate and a core layer surrounded by the clad layer. The clad layer is composed of a lower clad layer which is overlaid onto the substrate and an upper clad layer which surrounds the core layer.

Polymeric optical mixtures, polymeric optical materials and polymeric

Magnetic recording member having a magnetic storage layer covered by composite overlaying layers including an intermediate layer and a lubricant layer. The thin intermediate layer is formed by coating an aminosilane or epoxysilane compound directly or indirectly over the magnetic layer. The lubricant layer is formed over the intermediate layer by coating a lubricant made of a fluorinated hydrocarbon polymer having a terminal carboxyl or sulfonic acid group. The lubricant layer is chemically coupled with the intermediate layer by reacting the terminal carboxy or sulfonic acid group with the aminosilane or epoxysilane compound of the lubricant layer at room temperature or by heating, whereby the lubricant layer is stabilized to suppress deterioration of the lubricant layer and to suppress the reduction in lubricating property due to dispersion. With the stable lubricant layer according to the invention, abrasion of magnetic head slider slider and magnetic disc can be reduced and stiction of the head slider slider to the disc can be eliminated to preclude impairment of damage of the disc otherwise caused by head slider slider crash.

Magnetic recording member and process for manufacturing the same

A method for forming a negative resist pattern which applies as a high energy beam-sensitive material a polymer consisting of components expressed by the general structural formula: ##STR1## where: X=halogen or ##STR2## (R.sub.2 is H or CH.sub.3) R.sub.1 =H or CH.sub.3

Method of forming a negative resist pattern

A radiation-sensitive composition comprising a radiation-sensitive polymer which has in its molecule a plurality of epoxy groups and a plurality of bromine atoms, and at least one stabilizer which is selected from the group consisting of compounds having stable free radicals, polymerization inhibitors, ketone-amine reaction products, and phenol derivatives. Even when the composition is preserved for a long term, the characteristics do not change.

Radiation-sensitive composition

A polymeric resist mask composition thinly coated on a semiconductor substrate, wherein the prescribed portions of said resist mask are exposed to high energy rays such as electron beams, X-rays or ultraviolet rays for degradation, and the degraded portions of the resist mask are removed by an organic solvent to present a prescribed resist mask pattern on the semiconductor substrate, which comprises a halogenated polymethacrylic ester whose composition is expressed by the general formula ##STR1## (WHERE R denotes a halogenated alkyl radical including a halogen element selected from the group consisting of fluorine, chlorine and bromine, and at least one fluorine atom in case said radical contains chlorine or bromine and n indicates an average polymerization degree of 100 to 20,000) and an organic solvent for said halogenated polymethacrylate.

Polymeric resist mask composition

Growing community of inventors

Mito, Japan

Shungo Sugawara