Abstract: The invention provides a photosensitive element which comprises a sheet substrate having coated thereon an actinic radiation sensitive imageable layer. The imageable layer has an admixture an aromatic diazonium salt having an anion, and having a weight average molecular weight of from about 15,000 to about 35,000. The aromatic diazonium salt is present in an amount of from about 1 weight % to about 9 weight % of the imageable layer. The composition also has a solid epoxy polymer having a weight average molecular weight of from about 2,000 to about 8,000. The coating weight of the imageable layer per area is preferably from about 0.3 to about 0.9 g/m2. The imageable layer is sensitive to low levels of actinic irradiation, namely, from about 1 to about 40 mj/cm2 in the UV region. The sensitivity is increased by heating the imageable layer before development. After imagewise exposure and aqueous development, an imaged element is obtained, which is useful for lithographic printing.

Abstract: The invention provides a photosensitive element which comprises a sheet substrate having coated thereon an actinic radiation sensitive imageable layer. The imageable layer has an admixture an aromatic diazonium salt having an anion, and having a weight average molecular weight of from about 15,000 to about 35,000. The aromatic diazonium salt is present in an amount of from about 1 weight % to about 9 weight % of the imageable layer. The composition also has a cationic infrared absorbing dye which has the same anion as said aromatic diazonium salt, and a solid epoxy polymer having a weight average molecular weight of from about 2,000 to about 8,000. The coating weight of the imageable layer per area is preferably from about 0.3 to about 0.9 g/m2. The imageable layer is sensitive to low levels of actinic irradiation, namely, from about 1 and 40 mj/cm2 in the UV region and from about 50 to about 250 mj/cm2 in the IR region. The sensitivity is increased by heating the imageable layer before development.

Abstract: A novel fluorinated aromatic acetal polymer comprises at least one unit of A and at least one unit of B or C, or at least one unit of each of A, B and C and optionally further comprises at least one unit of either D or E or at least one unit of each of D and E, wherein the units A and B and/or C, and optionally D and/or E are linked together by single covalent C-C bonds and have the formulae: 1

Abstract: A novel fluorinated aromatic acetal polymer comprises at least one unit of A and at least one unit of B or C, or at least one unit of each of A, B and C and optionally further comprises at least one unit of either D or E or at least one unit of each of D and E, wherein the units A and B and/or C, and optionally D and/or E are linked together by single covalent C—C bonds and have the formulae: wherein RA is H or C1-C11 alky, or an aryl group that does not contain fluorine, and RB and RC are an aryl groups that contain fluorine. The polymer is prepared by reacting a hydrolyzed polyvinyl acetate polymer or copolymer with at least one non-fluorinated aldehyde component, and at least one fluorinated aromatic component. The polymer is useful is preparing a photosensitive composition which comprises at least one diazo resin and at least one such fluorinated aromatic acetal polymer.