A process for the dispersion of a dyestuff represented by the following formula (I), which comprises the acceleration of molecular orientation in advance and/or during the dispersion and/or after the dispersion:
D - (X)y (I)
wherein the terms are as defined herein. In a preferred embodiment, formula (I) is represented by the following formula (II) and the acceleration of molecular orientation is carried out by heating:
A₁ =(L₁ - L₂)m= L₃ -(L₄ = L₅)n- A₂ (II)
wherein the terms are as defined herein and the heating may be effected in the presence of an organic compound containing carboxylic group. A silver halide photographic material, which comprises a dyestuff dispersed therein in accordance with the dispersion process as defined above, the dyestuff may be represented by formula (II), the ratio of the absorbance at 680 nm to that at 530 nm in the absorption spectrum of the dyestuff is 0.50 or less, and the ratio of the primary diffraction intensity when the diffraction angle 2 ϑ of X-ray diffraction of the dyestuff is about 26 to 27 degrees to the secondary diffraction intensity when the diffraction angle 2 ϑ is about 14 degrees may be 1.30 or less.
一种分散下式 (I) 所代表的
染料的工艺,包括在分散前和/或分散过程中和/或分散后加速分子定向:
D - (X)y (I)
其中术语如本文所定义。在一个优选的实施方案中,式(I)由下式(II)表示,分子取向的加速是通过加热进行的:
A₁ =(L₁ - L₂)m= L₃ -(L₄ = L₅)n- A₂ (II)
其中术语如本文所定义,加热可在含有羧基的有机化合物存在下进行。一种卤化
银感光材料,它包括按照上文定义的分散工艺分散在其中的
染料,
染料可由式 (II) 表示,
染料吸收光谱中 680 纳米处的吸光度与 530 纳米处的吸光度之比为 0.50或更低,且当
染料的X射线衍射的衍射角2ϑ约为26至27度时的一次衍射强度与衍射角2ϑ约为14度时的二次衍射强度之比可以为1.30或更低。