Photoimaging composition containing admixture of leuco dye and 2,4,5-triphenylimidazolyl dimer
AssigneeE. I. Du Pont de Nemours and Company
InventorThomas M. Sheets
Life of this patent
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Abstract
Photoimaging composition comprising an admixture of leuco dye, and at least one 2,4,5-triphenylimidazolyl dimer prepared by an oxidative coupling reaction, a reaction product, 2,2',5-tris-(o-chlorophenyl)-4-(3,4-dimethoxyphenyl)-4',5'-diphenylbiimida zole, being present in an amount of 0.01 to 90.0% by weight based on the weight of solids in the composition. The composition when coated on a support is useful for prepress proofing.
Claims25
A photoimaging composition comprising an admixture of 2,4,5-triphenylimidazolyl dimers which are the product of 2-(o-chlorophenyl)-4,5-diphenylimidazole and 2,4-bis-(o-chlorophenyl)-5-[3,4-dimethoxyphenyl]-imidazole by oxidative coupling, a reaction product being 2,2',5-tris-(o-chlorophenyl)-4-(3,4-dimethoxyphenyl)-4',5'-diphenylbiimida zole, said admixture of dimers being present in an amount ranging from 0.01 to 90.0% by weight based on the weight of solids in the photoimaging composition, and a leuco dye that is oxidizable to dye by the imidazolyl radicals.
A photoimaging composition comprising an admixture of 2,4,5-triphenylimidazolyl dimers which are the product of 2-(o-chlorophenyl)-4,5-diphenylimidazole;
- 2,4-bis-(o-chlorophenyl)-5-[3,4-dimethoxyphenyl]-imidazole;
- 2,4,5-tris-(o-chlorophenyl)-imidazole;
- and 2-(o-chlorophenyl)-bis-4,5-(3,4-dimethoxyphenyl)-imidazole by oxidative coupling, a reaction product, being 2,2',5-tris-(o-chlorophenyl)-4-(3,4-dimethoxyphenyl)-4',5'-diphenylbiimida zole, said admixture of dimers being present in an amount ranging from 0.01 to 90.0% by weight based on the weight of solids in the photoimaging composition, and a leuco dye that is oxidizable to dye by the imidazolyl radicals.
A photoimaging composition comprising an admixture of 2,2',5-tris-(o-chlorophenyl)-4-(3,4-dimethoxyphenyl)-4,',5'-diphenylbiimid azole in an amount ranging from 0.01 to 90.0% by weight based on the weight of solids of in the photoimaging composition and at least one leuco dye that is oxidizable to dye by imidazolyl radicals.
Dependencies are inferred from the claim text.