Mitsubishi Chemical Industries Limited

Kazuo Torige

Konoe Miura

Yoshihiro Takahashi

Yoshiyuki Kisaka

Chihiro Eguchi

Hideo Fukutani

Nobuji Kikuchi

Masayuki Onose

Akinobu Oshima

Shinichi Bunya

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.

A developer for use with a lithographic photo-sensitive medium of a polyether resin, comprising a compound of the formula:

Developer for lithographic printing plate

A photosensitive composition is prepared from a mixture of a cinnamic acid photosensitive resin and a halogen-substituted benzanthrone sensitizer.

Photosensitive composition

A photosensitive composition is prepared from a mixture of a photosensitive resin containing radicals having the formula ##STR1## wherein X and Y represent hydrogen, halogen, cyano or nitro, Ar represents an aryl radical or a substituted aryl radical, and n represents 1 or 2, and a solvent having the formula ##STR2## wherein R and R' represent a lower alkyl radical and R' represents a lower alkylene radical.

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Tokyo, Japan

Kazuo Torige