Polaroid Corporation

Polaroid Coroporation

Patrick F King

Stephen G Stroud

Elbert M Idelson

Efthimios Chinoporos

Edward J Dombrowski, Jr

James R Freedman

This invention relates to novel di- and triarylmethane dye precursor compounds possessing a thiolactone, dithiolactone or thioether ring-closing moiety.

Thiolactone dye precursors

This invention relates to novel recording materials which employ color-forming di- and triarylmethane compounds possessing certain S-containing ring-closing moieties, namely, or thiolactone, dithiolactone or thioether ring-closing moiety and to a method of forming color by contacting these dye precursor compounds with a Lewis acid material capable of opening the thiolactone, dithiolactone or thioether ring-closing moiety whereby the compound is rendered colored, that is, converted to its chromophore color.

Recording material and process of using

This invention relates to novel compounds which are precursors for di- and triarylmethane dye precursor compounds possessing a thiolactone, dithiolactone or thioether ring-closing moiety.

Thiolactone metal complexes

This invention relates to a novel method of synthesizing di- and triarylmethane dye precursor compounds possessing a thiolactone ring-closing moiety, from the corresponding lactones.

Synthesis of thiolactones

This invention relates to the use of 3,5-dihydroxybenzoic acid as an organic acidic reagent in thermographic recording materials comprising a di- or triarylmethane thiolactone dye precursor, silver behenate and a polymeric binder, and in a further embodiment, relates to coating compositions useful in the preparation of the recording materials.

Thermographic recording materials and coating composition therefor

There are described novel pyrazole compounds represented by the formula ##STR1## wherein Y is a silver halide developing substituent or a precursor thereof; R is --OH, --NH.sub.2 or --NHSO.sub.2 --R.sub.1 ; R.sub.1 is alkyl having from 1 to 6 carbon atoms or phenyl; and m and n are the same or different and each is an integer of from 1 to 6. The pyrazole compounds are useful as intermediates in the preparation of azo and azomethine dye developers or as silver halide developing agents.

Novel pyrazole compounds having silver halide development groups

There are described novel azo and azomethine dye developers which include a pyrazolone moiety having two silver halide developing groups. In one embodiment the dye developers are metal complexed. The dye developer compounds are useful in photographic products and processes.

Azo and azomethine dye developers

A method for converting ether groups such as alkyl or aryl ether groups including hydroquinone ether groups to hydroxyl groups and ester groups such as alkyl or aryl ester groups to carboxylic acid groups which comprises reacting a compound including at least one ether and/or ester group with a 2-halo-1,3,2-benzodioxaborole to form an intermediate and hydrolyzing the intermediate such as by quenching it into water to form the desired final product.

Method for converting ether groups to hydroxyl groups and ester groups

Diffusion transfer photographic color products and processes are described in which there are utilized novel chrome complexed neutral tone black image dye-providing materials which include either a 1-naphthol-2'-naphthol-1', 2-azo dye moiety or a 2-naphthol-2'naphthol-1, 1'-azo dye moiety, a parasubstituted phenyl azo-pyrazolone dye moiety and a cation. The image dye-providing material includes a diffusion control moiety such as a hydroquinonyl group or a precursor thereof and may be diffusible or nondiffusible as a function of the diffusion control moiety.

Black image dye-providing materials and photographic products and

Novel chrome complexed azo and azomethine yellow dye developers which include a substantially colorless symmetrical ligand. Also disclosed are photographic products and processes which utilize the dye developers.

Chrome complexed dye developer compounds and photographic products and

Novel compounds which are capable of forming a coordination complex with a metal and which include a silver halide developing substituent or a precursor thereof. The compounds are useful as silver halide developing agents and as intermediates for dye developers which are utilized in photographic applications.

Ligands and photographic process

Chrome-complexed hexadentate dyes which include an ortho, ortho-dihydroxy azo or azomethine dye moiety, a colorless ligand which is a radical of an iminodiacetic acid and a linkage connecting the ligand to the dye moiety. In one embodiment the dyes include a photographically useful group and are also useful in photographic applications.

Growing community of inventors

N. Quincy, MA, United States of America

Patrick F King