| PATENT CLAIMS |
Method of producing a lithographic plate comprising the steps of: (i) Positive or negative image-wise thermal development of light-insensitive thermographic material, capable of being used to produce a lithographic printing plate, comprising a support, a hydrophobic thermosensitive layer & a hydrophilic surface adjoining said hydrophobic thermosensitive layer, said hydrophobic thermosensitive layer contg an ingredient A which upon heating reacts with at least one other ingredient B, in thermal working relationship with A, producing a moiety which changes the adhesion between said hydrophobic thermosensitive layer & said adjoining hydrophilic surface, wherein if A or B is an organic metal salt & the other A or B is reducing agent for organic metal soap, said reducing agent is selected from: aromatic compds having > 2 -OH in ortho or para positions on the same aromatic nucleus; aminophenols; p-phenylenediamines; alkoxynaphthols; pyrazolidin-3-ones; pyrazolin-5-ones; indan-1,3-dione deriv.; hydroxy tetrone acids; hydroxy tetronimides; hydroxylamine deriv.; hydrazine deriv.; & reductones; (ii) positive or negative image-wise sepn of said hydrophobic thermosensitive layer from said adjoining hydrophilic surface
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