Boron compounds as stabilizers in photothermographic materials
AssigneeEastman Kodak Company
InventorsJames Philip, Doreen Lynch, William Ramsden, Roger Klaus, Stacy Ulrich
Life of this patent
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Abstract
Thermally developable materials such as photothermographic and thermographic materials contain one or more boron compounds in an amount of at least 0.001 g/m2 as stabilizers. These boron compounds have an X—B(OL)-Z moiety.
Claims32
A black-and-white photothermographic material comprising a support having on a frontside thereof,
- a) one or more frontside photothermographic imaging layers comprising a polymer binder, and in reactive association, a photosensitive silver halide, a non-photosensitive source of reducible silver ions, and a reducing agent for said non-photosensitive source reducible silver ions,
- b) said material comprising on the backside of said support, one or more backside photothermographic imaging layers having the same or different composition as said frontside photothermographic imaging layers, and
- c) optionally, an overcoat layer disposed over said one or more photothermographic imaging layers on either or both sides of said support,
- wherein said material comprises one or more of the same or different boron compounds on one or both sides of said support, each of said boron compounds being present in said photothermographic imaging layers or in said overcoat, if present, or both.
A black-and-white thermally developable material comprising a support and having on a frontside thereon at least one thermally developable imaging layer, and optionally an overcoat layer disposed over said thermally developable imaging layer, each of said thermally developable layer and overcoat layer, if present, comprising the same or different polymer binder,
- said material further comprising, in reactive association:
- a. a non-photosensitive source of reducible silver ions,
- b. a reducing agent for said reducible silver ions, and
- c. a boron compound in said thermally developable imaging layer or in said overcoat, if present, or both,
- said boron compound being represented by Structure (II):
- X′—B(OL′)-Z′ (II)
- wherein X′ is hydroxy, alkoxy groups having 5 or more carbon atoms, alkyl groups having 5 or more carbon atoms, acyloxy groups, aryl groups, or heteroaryl groups,
- Z′ is alkyl groups having 5 or more carbon atoms, acyloxy groups, aryl groups, or heteroaryl groups.
- L′ is hydrogen, alkyl, acyl, aryl, or heteroaryl, or
- X′ and Z′ together represent carbon or heteroatoms sufficient to provide a heterocyclic ring with the boron atom, or still again,
- X′, L′, and Z′ together represent carbon or heteroatoms sufficient to provide heterocyclic rings with the boron atom,
- provided that when said polymer binder in said thermally developable imaging layer is a polyvinyl acetal, X′ is not alkoxy.
Dependencies are inferred from the claim text.