Mitsubishi Chemical Industries Limited

Akinobu Oshima

Shigeki Shimizu

Noriaki Takahashi

Konoe Miura

Yoshihiro Takahashi

Hiroshi Ide

Kazuo Torige

Chihiro Eguchi

Shinichi Bunya

A developer composition for a lithographic printing plate provided with a coated layer composed of a photosensitive polymer having in the main chain thereof groups of formula (I) ##STR1## wherein X and Y independently represent hydrogen, halogen, cyano or nitro and n is an integer of 1 or 2, comprising:

Developer composition for lithographic printing plates

A photosensitive lithographic plate having, on a substrate, a photosensitive layer comprising a photosensitive polyester containing at least (A):

Photosensitive lithographic plate with sulfonate containing

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 comprising a polyester formed from dicarboxylic acid units of the formula: ##STR1## wherein 1, m, n, p and q are independently an integer of 0 or 1 with at least one of 1, m and n having a value of 1, X and Y are independently hydrogen or X and Y are combined to form an alkylene group containing 1-4 carbon atoms; and said polyester containing alkylene glycol units of the formula: --O--(RO--.sub.r wherein R is alkylene of 2-4 carbon atoms and r is an integer of 2-4 and said polyester also containing hydrogenated bisphenol units represented by the formula: ##STR2## wherein R.sup.1 and R.sup.2 independently are hydrogen or an alkyl group of 1-6 carbon atoms.

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Tokyo, Japan

Akinobu Oshima