In a diffusion-transfer-color-development which utilizes non-diffusible color coupler (yellow) releasing diffusible (magenta) dye, acceleration on color development and transfer of released dye images is observed in the case when some of polymethylene-polyamines are introduced in developer.
In a series of 1,
n-diamino-
n-alkane NH
2-(CH
2)
n-NH
2 with 10% addition of ethanol, accelerating activities increases in linear relation to the increase of chain length of carbon number (
n) from 2 to 8, then activity abruptly decreases (at
n=10), and finally even retardation is observed (at
n=12). In general, including a series of type NH
2-[(CH
2)
n-NH]
m-(CH
2)
n-NH
2 polyamines, specific activities (
As) vary linearly with equivalent chain length or chain numbers (
NE) calculated upon some assumptions, according to the equation;
NE = 3
As + 2.5.
Effects of addition of various alcohols to the developer with or without a diamine accelerator are also studied and found to be sharply dependent on the chain length of alcohols.
It is concluded that acceleration occurs mainly in transfer stage of released dyes to a mordant layer and the mechanism is closely related to a surface-chemical phenomenon which involves a formation of micelles consisting of released anionic dyes and molecules of polymethylene-polyamines, sometimes together with alcohols, and the mechanism is also related to charge neutralization of the anionic dyes in the micelles by chelation with the polymethylenepolyamines for easier migration and transfer through layers.
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