Abstract: Photochemical acid progenitors in combination with dihydroperimidine squarylium dyes have been found to be particularly effective at generating acid upon irradiation with near-infrared radiation. It has been found that dihydroperimidine squarylium dyes that are particularly useful in this invention have an oxidation potential greater than about 0.5 V relative to SCE as measured in dichloromethane.

Abstract: Photochemical acid progenitors in combination with dihydroperimidine squarylium dyes have been found to be particularly effective at generating acid upon irradiation with near-infrared radiation. It has been found that dihydroperimidine squarylium dyes that are particularly useful in this invention have an oxidation potential greater than about 0.5 V relative to SCE as measured in dichloromethane.

Abstract: The invention relates to a method of increasing the sensitivity of laser induced thermal imaging by using certain diazo compounds. The diazo compounds contain functional groups adjacent the diazo substituent capable of stabilizing these compounds. The invention is useful in the field of thermal transfer imaging for the production of various graphic arts media.

Abstract: The invention relates to a method of increasing the sensitivity of laser induced thermal imaging by using certain sublimable compounds. The invention is useful in the field of thermal transfer imaging for the production of various graphic arts media.

Abstract: The invention relates to a method of increasing the sensitivity of laser induced thermal imaging by using certain diazo compounds. The diazo compounds contain functional groups adjacent the diazo substituent capable of stabilizing these compounds. The invention is useful in the field of thermal transfer imaging for the production of various graphic arts media.

Abstract: A cationic dye in a ketone solvent, wherein the cationic dye has a counterion which comprises a linear, branched or cyclic highly fluorinated alkylsulfonyl methide or highly fluorinated alkyl sulfonyl imide.

Abstract: Laser-addressable thermal transfer materials for producing color proofs, printing plates, films, printed circuit boards, and other media are disclosed. The materials contain a substrate coated thereon with a propellant layer wherein the propellant layer contains a material capable of producing nitrogen (N.sub.2) gas at a temperature of preferably less than about 300.degree. C.; a radiation absorber; and a thermal mass transfer material. The thermal mass transfer material may be incorporated into the propellant layer or in an additional layer coated onto the propellant layer. The radiation absorber may be employed in one of the above-disclosed layers or in a separate layer in order to achieve localized heating with an electromagnetic energy source, such as a laser. Upon laser induced heating, the transfer material is propelled to the receptor by the rapid expansion of gas.

Abstract: A high speed visible light sensitive photopolymerizable composition useful for printing plates comprising(a) at least one free radically polymerizable monomer having at least one ethylenically unsaturated group,(b) an ethylenically unsaturated free radically polymerizable oligomer having carboxyl groups substituted thereon,(c) a visible light sensitizing initiator system for free radical polymerization comprising an initiator selected from diaryl iodonium salts, halogenated triazines, and triaryl iodonium salts which are photoinitiating electron acceptor compounds having a reduction potential in the range 0.0 to -1.5 eV, spectrally sensititzed with at least one merocyanine sensitizer containing a constrained alkylamino group, preferably a julolidinyl group.

Abstract: A visible light sensitive free radical polymerization photoinitiator composition comprising (a) an initiator selected from diaryl iodonium salts, halogenated triazines, and triaryl sulfonium salts having a reduction potential in the range 0.0 to -1.5 eV, and (b) at least one merocyanine sensitizer containing a constrained alkylamino group.These initiator compositions give high speed polymerization reactions with ethylenically unsaturated monomers and oligomers.

Abstract: An image-forming laminate is formed by the combination of a thin, frangible light opaque material on top of a photosensitive layer which changes its surfactant properties when irradiated. The photosensitive layer according to the present invention comprises a film-forming polymeric binder, a photosensitive acid generator, and a surfactant selected from nonionic surfactants, the neutral form of cationic surfactants, amphoteric surfactants, and surfactant acid salts. Preferably the frangible light opaque material is a thin metal layer. There can also be present a support layer on the other surface of the photosensitive layer, as well as there can be an adhesive layer secured to the upper surface of the frangible light opaque material. The strength of adherence of the adhesive layer to the metal should be intermediate the strength of the adherence of the light opaque material prior to and after photoactivation.