Silver-dispersing polypeptides

Details Silver-dispersing polypeptides Silver-dispersing polypeptides

2007-02-20

2007-02-20

Russel, Jeffrey Edwin (Department: 1654)

Chemistry: natural resins or derivatives; peptides or proteins;

Peptides of 3 to 100 amino acid residues

C430S230000, C430S628000, C530S350000, C530S356000

Reexamination Certificate

active

10451897

ABSTRACT:
Silver halide emulsions for photographic uses contain a nucleation peptiser having at least one region A of up to 100 amino acids. Region A can either consist of (i) at least two silver-binding amino acids and up to 98 amino acids between the two silver-binding amino acids, or can consist of (ii) a stretch of from 9 to 100 amino acids having a polarity corresponding to an average transfer free energy ΔF equal to or higher than +1.0 kcal/mol. The nucleation peptizer also has at least one region B (separated from region A) having at least 50 amino acids and having a polarity corresponding to an average transfer free energy equal to or lower than −1.0 kcal/mol and not containing methionine residues. The emulsion may also contain a growth peptiser having similar characteristics to the nucleation peptiser, but having a longer A region and a greater overall length.

REFERENCES:
patent: 5773249 (1998-06-01), Cappello et al.
patent: 0926543 (1999-06-01), None
patent: 1014176 (2000-06-01), None
patent: 1063565 (2000-12-01), None
patent: WO 9623866 (1996-08-01), None

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