Leather colors

Leder-etui, n. leather case, -farbe, /. leather color, buff. 

Primid. [Rohm Haas] Aq. pigment dispersitMis to leather coloring. 

Products and Uses An ingredient in inks, dyes, tanning agents, photography chemicals, and pharmaceuticals useful for marker colors, leather coloring, and dyeing. 

Empirical C18H16N2O xCl2Zn Cl Properties Reddish-blue solid sol. in water, ethanol m.w. 311.45 Toxicology TSCA listed Uses Dye for cotton and leather colorant in hair dyes... 

Butyl rubber was and is enormously successful both technolc cally and in the business sense. But other Sparks inventions and coinventions also were commercially successful. Examples are styrene-isobutylene copolymers as coating for paper and paper milk bottles, styrene-isoprene copolymers as artificial leather, colored asphalt paving materials, oxo alcohols, and oxo ester plasticizers. During his brief period of employment as a research supervisor at USDA s Northern Regional Research Center, Peoria, Illinois, Dr. Sparks initiated work on dimer acids... 

All compounds of chromium are colored the most important are the chromates of sodium and potassium and the dichromates and the potassium and ammonium chrome alums. The dichromates are used as oxidizing agents in quantitative analysis, also in tanning leather. 

The apphcation of vegetable tanning materials has an additive effect on the leather. The more vegetable tannins appHed the more the leather becomes like vegetable-tanned leather. The color is changed, the fullness of feel increases, and the leather can be worked and embossed like vegetable leather. 

Chrome-tanned leather has chromium bonded to the leather fibers. This chromium can act as a mordant for acid dyes resulting in fast colors and intense shading at the surface of the leather. 

The greatest industrial consumption of monobasic aluminum acetate has been as a solution in the preparation of red color lakes for the dyeing of cotton. Formation of a water-resistant coating on fabrics, paper, leather, or other materials is also an important appHcation. In this process, for example, cloth is dipped into a solution of water-soluble soap, then into the aluminum salt solution, forming an insoluble, water-resistant aluminum soap coating on the fiber surfaces (10). 

Changes in the backbone of the sulfonic acid azo dyes often produce drastic changes in properties of the materials. The disulfonic acid (5) is somewhat similar to (3), but is used to color leather red (77). More esoteric dyes have also been developed based on sulfonic acid metal complexes and chitosan-derived materials (78,79). 

Cobalt is used as a blue phosphor in cathode ray tubes for television, in the coloration of polymers and leather goods, and as a pigment for oil and watercolor paints. Organic cobalt compounds that are used as colorants usually contain the azo (51) or formazon (52) chromophores. 

C rbocyclic Azo Dyes. These dyes are the backbone of most commercial dye ranges. Based totally on benzene and naphthalene derivatives, they provide yellow, red, blue, and green colors for all the major substrates such as polyester, cellulose, nylon, polyacrylonitrile, and leather. Typical stmctures (26—30) are shown in Figure 4. 

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