Mitsubishi Chemical Industries Limited

Mitsubishi Chemical Corporation

Mitsubishi Kasei Corporation

Yoshiyuki Kisaka

Yoshimitsu Kobayashi

Toshifumi Kawano

Kazuo Torige

Nobuji Kikuchi

Masayuki Onose

Toshihiko Yoshitomi

Mitsugu Wakabayashi

Takashi Hashimoto

Hidemi Yoshida

Michikazu Horie

Ichiro Nobuhara

Takanori Tamura

Seiki Nojiri

Mitsuaki Ohgaki

A magneto optical recording medium comprising the following elements has been developed:

Magneto optical recording medium

Disclosed herein is a read-only optical disk comprising an annulus transparent substrate of a synthetic resin having information pits thereon, a reflective layer comprising an Al alloy containing Ta and a protective layer provided thereover. The read-only optical disk according to the present invention is excellent in the corrosion resistance and has a high reliability.

Read-only optical disk containing a reflective layer comprising an Al

Disclosed herein is an optical recording medium for recording informations by irradiating the optical recording medium with a laser beam to form a hole or a deformed part thereon, said optical recording medium comprising a substrate and a recording layer containing at least Te, Se and F in the amounts of from 35 to 94.9 atomic % of Te, from 5 to 25 atomic % of Se and from 0.1 to 40 atomic % of F, produced by a reactive sputtering, said Se being derived from selenium fluoride and a sputtering target of Te or a sputtering target comprising Te-Se-alloy, and a process for producing the same.

Optical recording medium and process for producing the same

There is disclosed a process for preparing lithographic printing plate bases, which comprises electrolytically etching a sheet made of aluminum or an aluminum alloy in an electrolytic solution containing hydrochloric acid and a .beta.-dicarbonyl compound.

Process for preparing lithographic printing plate bases

There is disclosed a process for preparing lithographic printing plate bases, which comprises electrolytically etching a sheet made of aluminum or an aluminum alloy in an aqueous electrolytic solution containing hydrochloric acid and citric or malic acid at a bath temperature of 10.degree. to 40.degree. C.

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Kurashiki, Japan

Yoshiyuki Kisaka