Abstract: 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:(A) benzyl alcohol,(B) tetrahydrofurfuryl alcohol and(C) at least one acid selected from the group consisting of a mineral acid, an organic carboxylic acid and an organic sulfonic acid.

Abstract: A photosensitive lithographic plate having, on a substrate, a photosensitive layer comprising a photosensitive polyester containing at least (A):(a) an aromatic dicarboxylic acid unit represented by the general formula: ##STR1## where m and n each represents an integer of 0 or 1, with at least one of them being 1,(b) a dicarboxylic acid unit having a sulfonate group, and(c) a diol unit represented by the general formula: ##STR2## represents a hydrogenated benzene ring, R.sup.1 and R.sup.2 each represents an alkylene group of 2-4 carbon atoms, R.sup.3 and R.sup.4 each represents a hydrogen atom or an alkyl group of 1-6 carbon atoms, r and s each represents an integer of from 0 to 3 and t represents an integer of 0 or 1.

Abstract: A developer for use with a lithographic photo-sensitive medium of a polyether resin, comprising a compound of the formula:RO--CH.sub.2 --CH.sub.2 --O--.sub.k R.sup.1orROCH.sub.2 CH.sub.2 OR.sup.2(wherein R represents an alkyl group with carbon number of 1 to 4, R.sup.1 represents hydrogen or an acyl group, R.sup.2 represents an acyl group with a carbon number of 2 to 5, and k represents an integer of 2 to 3).

Abstract: 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.