Stabilized vinyl sulfone hardening compositions useful in photographic manufacturing
AssigneeEastman Kodak Company
InventorsLewis R. Hamilton, Peter A. Marr, Philip R. Martell, Kristine F. Ohman
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Abstract
Hydrophilic colloids, such as gelatin, which are employed in the manufacture of photographic elements are commonly treated with a hardening composition, among the most useful of which are hardening compositions containing vinyl sulfone hardening agents such as bis(vinylsulfonyl)methane. In accordance with this invention, a sulfate, such as sodium sulfate, is utilized as both an effective conductivity marker and an effective inhibitor of homopolymerization in such hardening compositions.
Claims20
A hardening composition that is useful in hardening a hydrophilic colloid which is incorporated in a layer of a photographic element, said hardening composition comprising a vinyl sulfone hardening agent and a sufficient amount of a sulfate to inhibit homopolymerization of said vinyl sulfone hardening agent;
- said sulfate being selected from the group consisting of ammonium sulfate, alkali metal sulfates and alkaline earth metal sulfates.
An aqueous coating composition that is useful in the preparation of a photographic element;
- said coating composition comprising a hydrophilic colloid, a sufficient amount of a vinyl sulfone hardening agent to harden said hydrophilic colloid, and a sufficient amount of a sulfate to inhibit homopolymerization of said vinyl sulfone hardening agent;
- said sulfate being selected from the group consisting of ammonium sulfate, alkali metal sulfates and alkaline earth metal sulfates.
In a process of hardening an aqueous coating composition that is useful in forming a layer of a photographic element comprising the step of adding a vinyl sulfone hardening agent to a hydrophilic colloid, the improvement comprising inhibiting homopolymerization of said vinyl sulfone hardening agent by combining it with an effective amount of a sulfate selected from the group consisting of ammonium sulfate, alkali metal sulfates and alkaline earth metal sulfates.
In a process for the manufacture of a photographic element comprising the step of adding a vinyl sulfone hardening agent to a coating composition containing a hydrophilic colloid and coating said composition on a photographic support, the improvement comprising inhibiting homopolymerization of said vinyl sulfone hardening agent by combining it with an effective amount of a sulfate selected from the group consisting of ammonium sulfate, alkali metal sulfates and alkaline earth metal sulfates.
In a photographic element comprising a support having one or more layers coated thereon at least one of which is radiation-sensitive and at least one of which contains a hydrophilic colloid at least partially forehardened with a vinyl sulfone hardening agent, the improvement wherein said at least one layer containing said vinyl sulfone hardening agent also contains a sulfate in an amount sufficient to inhibit homopolymerization of said vinyl sulfone hardening agent;
- said sulfate being selected from the group consisting of ammonium sulfate, alkali metal sulfates and alkaline earth metal sulfates.
Dependencies are inferred from the claim text.