Radiographic film developers containing ascorbic acid and thioether development accelerators
AssigneeEastman Kodak Company
InventorsAlan S. Fitterman, Joan F. Rachel
Life of this patent
Estimating the term…
Abstract
An alkaline, hydroquinone free, aqueous black-and-white radiographic developer comprising (a) an ascorbic acid developing agent; (b) a 3-pyrazolidone auxiliary developing agent; (c) an organic antifoggant; (d) a sulfite antioxidant; (e) a buffer; (f) a sequestering agent; and (g) A development accelerator selected from formulas I and II as follows: ##STR1## wherein R.sub.1, R.sub.2, and R.sub.3 represent alkyl of 1 to 8 carbon atoms or R.sub.1, R.sub.2, and R.sub.3 taken together with N atom to which they are attached form a 6 or 7 membered ring and X represents a tosylate ion, halide, or BF.sub.4.sup.-.
Claims12
An alkaline, hydroquinone free, aqueous black-and-white radiographic developer comprising
- (a) an ascorbic acid developing agent;
- (b) a 3-pyrazolidone auxiliary developing agent;
- (c) an organic antifoggant;
- (d) a sulfite antioxidant;
- (e) a buffer;
- (f) a sequestering agent;
- and
- (g) A development accelerator selected from formulas I and II as follows:
- ##STR7## wherein R.sub.1, R.sub.2, and R.sub.3 represent alkyl of 1 to 8 carbon atoms or R.sub.1, R.sub.2, and R.sub.3 taken together with N atom to which they are attached form a 6 or 7 membered ring and X represents a tosylate ion, halide, or BF.sub.4.sup.-.
Dependencies are inferred from the claim text.