Abstract: Incorporating a combination of phenolic reducing agents provides thermally developable materials with improved silver efficiency and hot-dark print stability without loss in other sensitometric properties. Both photothermographic and thermographic materials are provided, and particularly photothermographic materials having lower silver coverage.

Abstract: Thermally developable compositions such thermographic and photothermographic emulsions include certain triazine-thione compounds. These emulsions can be used in thermally developable materials such as thermographic and photothermographic materials to provide increased image density and shortened development time, and to allow development at lower temperatures. Such materials can have imaging layers on one or both sides of the support.

Abstract: Thermally developable compositions such thermographic and photothermographic emulsions include certain triazine-thione compounds. These emulsions can be used in thermally developable materials such as thermographic and photothermographic materials to provide increased image density and shortened development time, and to allow development at lower temperatures. Such materials can have imaging layers on one or both sides of the support.

Abstract: Thermally developable compositions such thermographic and photothermographic emulsions include certain triazine-thione compounds. These emulsions can be used in thermally developable materials such as thermographic and photothermographic materials to provide increased image density and shortened development time, and to allow development at lower temperatures. Such materials can have imaging layers on one or both sides of the support.

Abstract: Novel co-developer compounds are useful in combination with hindered phenol developers to produce high contrast black-and-white photothermographic elements. The co-developer compounds have the formula wherein: Y is H, a metal (preferably, an alkali metal), or an alkyl group (preferably, an alkyl group having from 1 to 4 carbon atoms), and the solid curved line represents the atoms and bonds necessary to complete a ring structure (preferably a 5 or 6 membered ring structure). The photothermographic elements may be used as a photomask in a process where there is a subsequent exposure of an ultraviolet or short wavelength visible radiation-sensitive imageable medium.

Abstract: Photothermographic materials provide images having improved image stability due to the presence of certain image stabilizing compounds in a silver-containing layer. These image stabilizing compounds are fluorenone, fluorene, coumarin, naphthalic acid imide, pyrazoline, or anthracene compounds. In particular, they reduce image browning that may occur from the presence of various components in the materials.

Abstract: High contrast thermographic and photothermographic materials comprise a barrier layer to prevent migration of diffusible by-products resulting from high temperature development. The barrier layer comprises a film-forming polymer(s) that reacts with or acts as a physical barrier to diffusible by-products resulting from development including formic acid, hydrazo compounds, azo compounds, diimide compounds, hydrazine, and water.

Abstract: 1-Sulfonyl-1H-benzotriazole compounds have been found to be useful as antifoggants and print stabilizers in photothermographic elements. The photothermographic elements may be used in medical imaging films or as a photomask in a process where there is a subsequent exposure of an ultraviolet or short wavelength visible radiation-sensitive imageable medium.

Abstract: Compounds having general structure (I) have been found to be useful as stabilizers in photothermographic elements. The photothermographic elements comprise a support bearing an imaging coating (specifically, a photosensitive, image-forming, photothermographic coating) comprising:(a) a photosensitive silver halide;(b) a non-photosensitive, reducible source of silver;(c) a reducing agent for the non-photosensitive, reducible source of silver;(d) a binder; and(e) a compound having general structure (I) ##STR1## wherein X is O or S; and Y is NH.sub.2, OH, or O.sup.- M.sup.+ wherein M.sup.+ is a metal atom.The photothermographic elements may be used in medical imaging films or as a photomask in a process where there is a subsequent exposure of an ultraviolet or short wavelength visible radiation-sensitive imageable medium.

Abstract: Certain propenenitrile compounds have been found to function as antifoggants and serve to improve the initial minimum density of black and white photo-thermographic and thermographic elements.

Abstract: Sulfonyl hydrazides are used as developers in phothothermographic and thermographic elements. The sulfonyl hydrazides have the formula:R.sup.1 --CO--NHNH--SO.sub.2 --R.sup.2wherein R.sup.1 and R.sup.

Abstract: Sulfonyl hydrazides are used as developers in phothothermographic and thermographic elements. The sulfonyl hydrazides have the formula:R.sup.1 --CO--NHNH--SO.sub.2 --R.sup.2wherein R.sup.1 and R.sup.

Abstract: Radiation sensitive thermally developable imaging elements comprise:a) photosensitive silver halide,b) light insensitive silver salt oxidizing agent,c) reducing agent for silver ions, andd) an antifoggant or speed enhancing compound comprising hydrobromic acid salts of nitrogen-containing heterocyclic ring compounds which are further associated with a pair of bromine atoms. The antifoggants are effective in reducing spurious background image densities.