Organic dyes for finish preparations

Soluble in water brightening dyes
In a finishing formulation the ratio of binders, pigments, waxes are adjusted as required for article to be made. In some leather finish specially light or low pigmented finish for color adjusted metal complex dyes are added in base coat are used for dye staining. Selected anionic dyes which are added to the base coating, pigment finishes or top coating mixtures in combination or alone in order to enhance brilliance or the aniline effect. For this application they should be highly compatible with the finishing agents, have good lightfastness properties and good fastness to bleeding and hot plating. Furthermore, only dyes with a low content of extenders such as liquid should be used the ratio 1:2 metal complex dyes are also very suitable.
Color lacquers
Now used only seldom. 2 parts anionic dyes are mixed with 1 part basic dye in dissolved form at boiling temperature. Such lakes improve covering power while retaining an aniline effect and have good fixation properties.
Polymer dyes
These are dyes which have been polymerized in acrylic acid ester or copolymers. As a result they are well fixed and cannot be dissolved by water or solvents. In some cases it is of advantage that excessive amounts of binders have to be applied until the desired effect is achieved.
Soluble in organic solvents
Metal complex dyes
These are free from extenders and exhibit varying solubility in organic solvents. The solubility charts of the manufacturers should be consulted. The dyes are mostly used for dyeing transparent nitrocellulose lacquers in order to obtain aniline effects. Only dyes which are free from hydroxyl groups are suitable for use with one or two-component polyurethane lacquers.