| 摘要 |
PURPOSE:To increase whiteness degree of a photographic sensitive paper even if it is processed rapidly and to inhibit decrease of the whiteness degree against the lapse of time by incorporating a specified fluorescent whitening agent into the photographic sensitive paper. CONSTITUTION:The title photographic sensitive paper is provided with a photographic elements on a substrate, and a fluorescent whitening agent expressed by the formula I is incorporated into the photographic elements. In the formula, each R1 to R4 is a substituent having -1.0 to +1.0 sigmap value listed in a Hammett's substituent table; X is -NH, S, etc. Compds. expressed by the formula II may be useable as the fluorescent whitening agent expressed by the formula I. Further, addition of a silver halide developing agent(e.g. hydroquinone) to the elements is desirable, and addition of a polymer latex(e.g. polyethyl acrylate latex) is also preferred. The fluorescent whitening agent expressed by the formula is added preferably by dissolving or dispersing it in a high boiling solvent(e.g. compd. expressed by the formula III). |
