Dupont (uk) Limited

Vickers, Inc.

Du Pont-howson Limited

Christopher W Folkard

John R Wade

Terrence Etherington

Christopher R Millross

Gary A Goddard

A radiation sensitive composition comprises a radiation sensitive material and a dye which dye undergoes a colour change in the radiation-struck areas on image-wise exposure of the composition and a colour change when the exposed and developed composition is heated to a temperature of at least 180.degree. C.

Radiation sensitive compositions

A method of removing inks and other oily contaminants from printing machines, printing plates and offset blankets using a cleaning aid that is based on a C.sub.6 or higher alkyl ester of a fatty acid, preferably containing 8 to 22 carbon atoms. The cleaning aid does not significantly degrade images on printing plates.

Method of recovering oily contaminants from printing machines, plates

A radiation sensitive composition comprises a radiation sensitive material and a dye which dye undergoes a color change in the radiation-struck areas on image-wise exposure of the composition and a color change when the exposed and developed composition is heated to a temperature of at least 180.degree. C.

Radiation sensitive compositions are image-wise exposed and developed to form an image which is then heated to improve its strength as a lithographic printing image or etch resist. The heating is carried out in the presence of a heat sensitive dye which undergoes a color change at a temperature of at least 180.degree. C. so as to obtain an indication of whether or not the heating has been adequate. The dye may be an integral component of the composition or it may be applied to the image, after development, in combination with a substance capable of forming a shield against contaminating residues produced during the heating step.

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Leeds, United Kingdom

Christopher W Folkard