| 摘要 |
PURPOSE: To shorten the relief developing time, to relieve the toxicity of solvent and to reduce malodor by using a hydrogenated petroleum fraction having a specified flash point and b.p. range as the solvent. CONSTITUTION: A picture is exposed in a layer cross-linkable by photopolymerization (e.g. a layer contg. styrene-isoprene-styrene/butadiene as a binder) by using active rays, the part of the unexposed part which is not cross-linked is washed out with a hydrocarbonic solvent A or a mixture of the solvent A and an alcohol B. A hydrogenated petroleum fraction having >=45 deg.C flash point and 160-220 deg.C b.p. is used as the solvent A. The aromatic content according to DIN 51378 of the fraction is preferably controlled to <1%, the naphthenic part according to DIN 51378 is preferably adjusted to 0.5-50%, and 4-5C alcohols are used as the alcohol B. |
