Лако-красочные материалы — производство

After azo pigments, the second most important class of pigments in terms of usage is copper phthalocyanine and its derivatives because of their excellent overall performance properties combined with good economy. They are ideal pigments, having high color strength, excellent thermal stability, good light fastness and excellent solvent fastness. They cover the blue and green […]

These are pigments with condensed aromatic or heterocyclic ring systems. Chemically, there are several subclasses in the category. Most of them have good light and weather fastness combined with good solvent and migration resistance.

Although these heterocyclic azomethine-based high performance organic pigments have comparatively good light and weather fastness and solvent and migration resistance, very few of them are commer­cially available as pigments. They produce greenish to reddish-yellow hues and are used in high grade coatings and inks. Some widely known examples are Pigment Yellow 10 (Figure 3.14), 110 […]

Azo condensation pigments are among the high performance organic pigments used in the industry. These pigments can be visualized as the condensation of two carboxylic monoazo components with one aromatic diamine through formation of an amide (-CONH-) bridge. Their high MW as well as the presence of amide groups leads to improved solvent fastness, migration […]

This small yet unique class of azo pigments offers azo coordination complexes with chelating metals such as nickel, cobalt or iron(II). They have good light, weather and solvent fastness properties. They offer greenish to reddish-yellow and yellowish-orange colors. They are used in industrial and auto­motive paints as well as printing inks. Some common examples are […]

In Europe, salt-type azo pigments are known as toners, while in the rest of the world, they are known as lakes. These pigments are for­med by precipitating a monazo compound (dyestuff) that contains sulfonic and/or carboxylic acid groups with suitable metal ions such as sodium, calcium, barium or strontium. The acid groups may be carried […]

This group of pigments has improved fastness to heat, solvents and light compared to monoazo pigments due to molecular enlargement. They are produced by the coupling of substituted aromatic diami­nes as diazonium salts with acetoacetic arylides or pyrazolones as coupling components to give diarylide yellows and pyrazolone oran­ges, respectively. In another approach, diazotized aromatic amines […]

Monoazo pigments are obtained by coupling a diazonium salt of a substituted aromatic amine with a suitable coupling agent. Acetoa — cetic arylides are used as coupling agents to yield a range of yellow pigments generically known as arylamide yellow, while b-naphthol is used for orange and red pigments generically known as b-naph- thol red. […]

Azo pigments are the most common organic pigments and cover a large volume of the commercially available organic pigments. They are compounds having an azo group (-N=N-) in their structure as the chromophore (color producing group). Azo pigments are synthe­sized by the standard sequence of diazonium salt formation from an aromatic amine and subsequent reaction […]

Organic pigments are a vast class offering a large number of pig­ments with varying hues and chroma. Organic pigments gained importance in the coating industry due to restrictions on some inorganic pigments containing heavy metals as well as due to their high color purity and tinctorial strength compared to most inorga­nic pigments. Some important pigmentary […]