E.i. Dupont De Nemours and Company

Sterling Diagnostic Imaging, Inc.

Agfa Gevaert Nv

Promerus, Lcc

Dietrich M Fabricius

Gregory Charles Weed

Thomas Schelhorn

Allan R Schoenberg

Alden D West

Ralf Hermann Harms

James Joseph Welter

Andrew Bell

Brian F Knapp

Peter Wyatt Newsome

Raymond J LeStrange

Dane Jablonski

Bernard Allan Apple

James J Welter

Joseph T Guy

Otho P Hoyte

Embodiments in accordance with the present invention provide for forming essentially pure diastereomers of 5/6-substituted norbornene-type monomers. Further, embodiments in accordance with the present invention encompass polymerizing such diastereomers to form addition or ROMP polymers where a desired exo-/endo-ratio of the diastereomers is provided to the polymerization, such ratio designed to provide a desired ratio of endo-/exo-structured repeating units for a resulting polymer to have desired physical or chemical properties.

Generation of endo- and/or exo-norbornenecarboxaldehyde as an intermediate to functionalized norbornenes

Novel photopolymer compositions are disclosed which contain dyes that absorb strongly in the near infrared (near IR) region of the electromagnetic spectrum. These dyes are useful as photosensitizers for initiating a variety of photoimaging and photopolymerization reactions. Imaging Media are disclosed herein which are sensitive in the near infrared (near IR) region of the electromagnetic spectrum and which can initiate polymerization of ethylenically unsaturated monomer components in negative-acting photopolymer systems and/or which can initiate conversion of a leuco dye to its corresponding colored dye form. These imaging media comprise either a near IR dye photochemical sensitizer, a hexaarylbiimidazole (HABI) photoinitiator, a chain transfer agent, and a photopolymerizable material or a near IR dye photochemical sensitizer, a hexaarylbiimidazole (HABI) photoinitiator, and a leuco dye. These imaging media are useful in a variety of photopolymer products, including photoresists, proofing films, and holographic recording films.

Near IR sensitive photoimageable/photopolymerizable compositions, media, and associated processes

Provided is an improved sensitization method for photographic element. The photographic element comprises a support with at least one hydrophilic colloid layer coated thereon. The hydrophilic colloid layer comprises silver halide grains which are chemically sensitized with at least one compound represented by Formula 1:

Sensitization of silver halide

Disclosed is a novel near-infrared absorbing dye of formula: ##STR1## wherein X.sup.1, X.sup.2 independently represents --CR.sup.8 R.sup.9 --, --S--, --Se--, --NR.sup.10 --, --CH.dbd.CH-- or --O--; n is an integer of 2 or 3; R.sup.1 and R.sup.2 independently represent alkyl of 1 to 10 carbons or substituted alkyl of 1 to 10 carbons; R.sup.3 represents a ring chosen from a set consisting of aryl, substituted aryl, and a heterocyclic ring of a type present in photographic emulsions; R.sup.4, R.sup.5, R.sup.6 and R.sup.7 independently represent hydrogen, alkyl of 1-10 carbons, substituted alkyl of 1-10 carbons, R.sup.4 and R.sup.5 taken together or R.sup.6 and R.sup.7 taken together can represent atoms necessary to form a 5 or 6-membered aliphatic ring, an aromatic six-membered ring, an aromatic 10-membered ring, a substituted aromatic six-member ring or a substituted aromatic 10-member ring; R.sup.8, R.sup.9 independently represent alkyl of 1-10 carbons, substituted alkyl of 1-10 carbons, aryl of 6-10 carbons, or substituted aryl of 6-10 carbons; and R.sup.10 represents an alkyl of 1-10 carbons, substituted alkyl of 1-10 carbons, aryl of 6-10 carbons, or substituted aryl of 6-10 carbons; with the proviso that when R.sup.3 is phenyl or substituted phenyl and n=3, R.sup.1 or R.sup.2 is not an unsubstituted alkyl.

Thioheterocyclic near-infrared dyes

Disclosed is a novel near-infrared absorbing dye of formula: ##STR1## wherein X.sup.1, x.sup.2 independently represents --CR.sup.8 R.sup.9 --, --S--, --Se--, --NR.sup.10 --, --CH.dbd.CH-- or --O--;

Improved spectral sensitization with a synergistic combination of dyes is described. The two dyes include a first sensitizing dye is represented by Formula 1. ##STR1## and a second dye represented by Formula 2. ##STR2## The substituents of are defined in the description.

Spectral sensitization of silver halide photographic elements

The present invention is directed to a dye suitable for spectral sensitization of a photographic element. Specifically, the dye is a compound having the structure: ##STR1## wherein: R.sup.1, R.sup.2, R.sup.3, and R.sup.4 each independently represents H; halogen; alkyl of 1-6 carbons; aryl of 6-24 carbons; alkoxy of 1-6 carbons; carbonyl; or sulfonate; or R.sup.1 and R.sup.2, R.sup.2 and R.sup.3, or R.sup.3 and R.sup.4 taken together represent the atoms necessary to complete a six-membered carbocylic ring;

Zeromethine merocyanine dyes useful as spectral sensitizers in

Disclosed is a novel near-infrared absorbing dye of formula: ##STR1## wherein X.sup.1, X.sup.2 independently represents --CR.sup.8 R.sup.9 --, --S--, --Se--, --NR.sup.10 --, --CH.dbd.CH-- or --O--;

Thioheterocyclic near-infrared absorbing dyes

A novel dye and photographic element comprising the dye are detailed. The dye is especially useful as an antihalation dye in a photographic element. A particularly preferred embodiment is provided in a photographic element comprising an absorbing amount of the dye: ##STR1## wherein X1, X2 independently represents --CR.sup.8 R.sup.9 --, --S--, --Se--, --NR.sup.10 --, --CH.dbd.CH-- or --O--;

Silver halide photographic element containing dyes for antihalation

A novel dye and photographic element comprising the dye are detailed. The dye is especially useful as an antihalation dye in a photographic element. A particularly preferred embodiment is provided in a photographic element comprising an absorbing amount of the dye: ##STR1## wherein X.sup.1, X.sup.2 independently represents --CR.sup.8 R.sup.9 --, --S--, --Se--, --NR.sup.10 --, --CH.dbd.CH-- or --O--;

Photographic element with ether dyes for near-infrared antihalation

An improved stabilizer is provided with decreased fog and minimal loss of photographic speed. The stabilizers are represented by

Silver halide emulsions stabilized with improved antifoggants

An improved dye class and preparation procedure therefore is provided. The dyes can be prepared from a Stenhouse salt which is economical and can be prepared from readily available reagents. The improved dye is particularly suited for use as an antihalation dye in photographic elements and does not impart deleterious properties thereto. These and other properties are provided in a dye represented by: ##STR1## wherein the constituents have defined values.

Near-infrared absorbing dyes prepared from stenhouse salts

Disclosed is a photographic element comprising an antihalation dye of formula: ##STR1## wherein X.sup.1, X.sup.2 independently represents --CR.sup.8 R.sup.9 --, --S--, --Se--, --NR.sup.10 --, --CH.dbd.CH-- or --O--;

Growing community of inventors

Hendersonville, NC, United States of America

Dietrich M Fabricius