Abstract: This invention relates to negative working color proofing sheet constructions which, upon exposure to an actinic radiation source through a screened image, can accurately reproduce said image. The construction is useful as a color proofing film which can be employed to accurately predict the image quality from a lithographic printing process. The image is produced by forming a composite of a receiver sheet, an adhesive layer, a color layer and cover sheet. Upon imagewise exposure, a negative image appears on the receiver base after dry peel apart development.

Abstract: This invention provides novel ethylenically unsaturated urethane monomers and photoreactive compositions comprising such monomers as essential constituents. The monomers can be photopolymerized or photocrosslinked and are useful in coating systems and multilayer color proofing systems. Additionally, they offer superior advantages such as significantly reduced migration between layers in multilayer color proofing systems.

Abstract: In the present invention, one produces a negative-acting color proofing element comprising, sequentially, a strippable cover sheet which is transparent to actinic radiation; a crosslinked layer containing a polymer having phenolic groups; a color layer, containing a colorant, a polymeric binder, a polymerizable monomer and, optionally, a photoinitiator; a photoadhering layer, containing a linear photosensitive polymer containing ethylenically unsaturated, free-radical polymerizable groups and having a molecular weight greater than 3,000, a polymerizable monomer, and, optionally, a free radical photoinitiator; a thermoplastic adhesive layer; and a receiver sheet, at least one of the color layer and the photoadhering layer containing the photoinitiator.

Abstract: This invention relates to negative working photopolymerizable sheet constructions which, upon exposure to an actinic radiation source through a screened image, can accurately reproduce said image. The construction is useful as a color proofing film which can be employed to accurately predict the image quality from a lithographic printing process. Image development is by peel apart processing.

Abstract: The invention describes light-sensitive bis-trichloromethyl-s-triazines of the general formula I ##STR1## wherein A denotes the ring members required to complete a 5- or 6-membered heterocyclic ring which may be substituted or may carry a substituted or unsubstituted fused benzene ring,R denotes a substituted or unsubstituted alkyl group andX denotes CH or N.The compounds are readily prepared in high yields. They are suitable for use as light-sensitive free-radical and acid donors in light-sensitive compositions.

Abstract: This invention relates to positive working color proofing sheet construction which, upon exposure to an actinic radiation source through a screened image, can accuratley reprouce said image. The construction is useful as a color proofing film which can be employed to accurately predict the image quality from a lithographic printing process. The image is produced by forming a composite of a receiver base, diazo or diazide layer, photopolymerizable layer and cover sheet. Upon imagewise exposure, a positive image appears on the receiver base after dry peel apart development.

Abstract: A photopolymerization initiator composition is disclosed. The composition is comprised of 1,4 or 9,10 dimethoxyanthracene and 2-tri(chloro or bromo)methyl-4(1H)-quinazolinone. The initiator composition is useful in preparing photopolymerizable compositions having increased effective photospeed.

Abstract: A photo polymerization initiator composition is disclosed. The composition is comprised of an in admixture with an acridine, initiator compound. The initiator composition is useful is preparing photopolymerizable compositions having increased effective photospeed.