Thermally developable imaging materials with barrier layer containing a cellulose ether polymer
AssigneeEastman Kodak Company
InventorBryan V. Hunt
Life of this patent
Estimating the term…
Abstract
Thermographic and photothermographic materials comprise a barrier layer to provide physical protection and to prevent migration of diffusible imaging components and by-products resulting from high temperature imaging and/or development The barrier layer comprises 15 to 100 weight % of a film-forming cellulose ether polymer. This barrier layer is capable of retarding diffusion of mobile chemicals such as fatty carboxylic acids, developers, and toners. This barrier layer can also include other film-forming polymers to provide a clear and scratch-resistant surface.
Claims34
A thermally developable material comprising a support having thereon:
- a) one or more thermally developable imaging layers comprising a binder and in reactive association, a non-photosensitive source of reducible silver ions that is one or more silver salts of long chain aliphatic carboxylic acids having from 10 to 30 carbon atoms and a reducing agent composition for said non-photosensitive source reducible silver ions, and
- b) a barrier layer that is on the same side of but farther from said support than said one or more imaging layers, said barrier layer containing a cellulose ether polymer that is soluble in a solvent comprising at least 50 weight % of a polar organic solvent,
- wherein said barrier layer is capable of retarding the diffusion of or reacting with said long chain aliphatic carboxylic acids.
A black-and-white photothermographic material comprising a support having thereon:
- a) one or more thermally developable imaging layers comprising a binder and in reactive association, a photosensitive silver halide, a non-photosensitive source of reducible silver ions that is one or more silver salts of long chain aliphatic carboxylic acids having from 10 to 30 carbon atoms, and a reducing agent composition for said non-photosensitive source reducible silver ions, and
- b) a barrier layer that is on the same side of but farther from said support than said one or more imaging layers, said barrier layer containing a cellulose ether polymer that is soluble in a solvent comprising at least 50 weight % of a polar organic solvent,
- wherein said barrier layer is capable of retarding the diffusion of or reacting with said long chain aliphatic carboxylic acids.
A black-and white photothermographic material comprising a polyester support having thereon:
- a) one or more photothermographic imaging layers comprising a hydrophobic binder and in reactive association, a photosensitive silver bromide, iodobromide, or mixtures thereof, a non-photosensitive source of reducible silver ions that includes one or more silver salt of lone chain aliphatic acids having 10 to 30 carbon atoms that includes silver behenate, and a reducing agent composition for said non-photosensitive source reducible silver ions that includes one or more bisphenols,
- b) a barrier layer that is on the same side of but farther from said support than said one or more photothermographic imaging layers, said barrier layer containing a cellulose ether polymer that is a methyl cellulose polymer, ethyl cellulose polymer, hydroxyethyl cellulose polymer, ethoxyethyl cellulose polymer, hydroxypropyl cellulose polymer, methoxypropyl cellulose polymer, hydroxypropoxypropyl cellulose polymer, or mixtures thereof that is soluble in a solvent comprising at least 50 weight % of a polar organic solvent.
- wherein said barrier layer is capable of retarding the diffusion of or reacting with said long chain aliphatic carboxylic acids,
- and wherein said barrier layer is present at a coverage of from about 0.1 to about 10 g/m2, and
- c) on the backside of said support, one or more layers wherein at least one layer comprises an antihalation composition.
A method of preparing a thermally developable material comprising:
- A) applying to a support a thermally developable imaging formulation comprising a binder, a non-photosensitive source of reducible silver ions, and a reducing agent composition for said non-photosensitive source reducible silver ions, and
- B) simultaneously or subsequently, applying a barrier layer formulation over said thermally developable imaging formulation, said barrier layer formulation comprising a solvent comprising at least 50 weight % of a polar organic solvent and a cellulose ether polymer.
Dependencies are inferred from the claim text.