commercially available from monsanto as formvar the formal content of the polyvinyl formals is approximately 65 to 86 expressed as polyvinyl formal the acetate content is approximately 9 to 30 expressed as polyvinyl acetate the hydroxyl content is approximately 5 to 7 as expressed as polyvinyl alcohol the average molecular weight is between 10 000 and 40 000 dyes may be included to spectrally sensitize the photoinitiator such as described in u s pat nos 4 282 309 and 4 454 218 and european patent application nos 0 179 448 and 0 211 615 other ingredients which may be present in the photosensitive layer are thermal polymerization inhibitors plasticizers oligomers residual solvents surfactants inert fillers antihalation agents hydrogen atom donors photoactivators and optical brightening agents in the preferred embodiment the dry photosensitive layer has a coating weight range between approximately 0 1 and 5 g m 2 the more preferred coating weight is between approximately 0 4 to 2 g m 2 in the practice of the present invention the photopolymerizable monomer component is preferably present in the photosensitize layer in an amount ranging from approximately 10 to 60 based on the weight of the solids in the layer a more preferred range is from approximately 15 to 40 in the practice of the present invention the photoinitiator component is preferably present in the photosensitive layer in an amount ranging from approximately 2 to 30 based on the weight of the solids in the layer a more preferred range is from approximately 6 to 20 in the practice.