Light-desensitizable transfer medium with photooxidizable reactant and oxygen-sensitizing dye

摘要

A transfer medium useful for preparing duplicates of originals such as printed matter. The transfer medium comprises a light- transmissive backing sheet, a layer coated on at least one major surface thereof containing a photooxidizable reactant and an oxygen-sensitizing dye in a film-forming binder and, over said layer, a top coat of an oxygen- permeable, low tack adhesive.PPUpon imagewise exposure to light, the transfer medium is desensitized in areas corresponding to the light image areas of the original, resulting in a latent image in the areas corresponding to the dark image areas of the original.P PThe unoxidized photooxidizable reactant is capable of inter-reacting with a second reactant material borne on the surface of a receptor sheet at a conversion temperature between 70° C. and 150° C. to produce a visibly distinct reaction product. The adhesive coating serves to provide close contact between the transfer medium and the original during the exposure step and between the transfer medium and receptor sheet during the image-forming step.