Xanthate salts as chemical sensitizers for silver halides
AssigneeEastman Kodak Company
InventorsKenneth James Lushington, Henry James Gysling
Life of this patent
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Abstract
The invention is generally accomplished providing to a method of sensitizing silver halide grains comprising providing a silver halide grain and bringing said grain into contact with a compound of Formula I, C.sup.+ {S.sub.2 COR}.sup.- Formula I where C is NH.sub.4.sup.+, AR'.sub.4.sup.+ or M.sup.+ A is N, P, or As R' is alkyl or aryl M is Li, Na, or K, and R is alkyl or aryl.
Claims16
A method of sensitizing silver halide grains comprising providing a silver halide grain and bringing said grain into contact with a compound of Formula I,
- C.sup.+ {S.sub.2 COR}.sup.- Formula I
- where
- C is NH.sub.4.sup.+, AR'.sub.4.sup.+ or M.sup.+
- A is N, P, or As
- R' is alkyl or aryl
- M is Li, Na, or K, and
- R is alkyl or aryl.
A silver halide emulsion comprising providing silver halide grains and a compound of Formula I,
- C.sup.+ {S.sub.2 COR}.sup.- Formula I
- where
- C is NH.sub.4.sup.+, AR'.sub.4.sup.+ or M.sup.+
- A is N, P, or As
- R' is alkyl or aryl
- M is Li, Na, or K, and
- R is alkyl or aryl.
Dependencies are inferred from the claim text.