Dimers derived from unsymmetrical 2,4,5-triphenylimidazole compo

Details Dimers derived from unsymmetrical 2,4,5-triphenylimidazole compo Dimers derived from unsymmetrical 2,4,5-triphenylimidazole compo

1979-08-14

1981-02-24

Brammer, Jack P.

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Radiation sensitive composition or product or process of making

20415918, 20415923, 430283, 430287, 430288, 430915, 430917, 430920, G03C 168

Patent

active

042528879

ABSTRACT:
Photoimaging compositions comprising (A) 2,4,5-triphenylimidazolyl dimer having selected substituents on the 2,4 and 5 phenyl rings and an extinction coefficient determined in methylene chloride at 10.sup.-5 to 10.sup.-3 mol/liter at 350 nm of at least 4000 liters/mol-cm and at 400 nm of at least 250 liters/mol-cm; and at least one of (B1) leuco dye or (B2) addition polymerizable ethylenically unsaturated monomeric compound. The new imaging compositions are useful in preparing dual response photoimaging products such as proofing papers, printout paper, overlay films and photopolymerizable elements. Improved imaging speed is achieved at equal concentration levels when compared with conventional 2,4,5-triphenylimidazolyl dimers.

REFERENCES:
patent: 3445234 (1969-05-01), Cescon et al.
patent: 3479185 (1969-11-01), Chambers
patent: 3658543 (1972-04-01), Gerlach et al.
patent: 3661461 (1972-05-01), Dessauer
patent: 3784557 (1974-01-01), Cescon

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