Diarylide Yellow Dispersion

Diarylide Yellow is a high-performance red-shade yellow azo pigment that is more opaque, has good tinting strength, and enhances outdoor durability. Diarylide Yellow (PY83) pigments offer better solvent and migration resistance than monoazo yellow pigments, making them suitable for inks, plastics, and paint. Our Diarylide yellow is a reddish-yellow pigment recommended for paints as an alternative to replace reddish shade chrome yellows to produce lead-free paints and inks.

Diarylide Yellow Pigment Dispersion

Pigment Information
Color:	Yellow
Pigment Classification:	Synthetic Organic
Colour Index:	Pigment Yellow 83 (21108)
Chemical Name:	Diarylide Yellow (3,3’ dichl3,3’enzidine coupled with acetoacet-4-methoxy-5-chloro-o-anisidide)
Chemical Formula:	C36H32Cl4N6O8
Chemical Structure:
CAS No.:	5567-15-7
Series No.:	4
ASTM Lightfastness
Acrylic:	I
Oil:	I
Watercolor:	I
Physical Properties
Specific Surface:	20 m2/g
Density:	1.5 g/cm3
Bulk Volume:	4.3 l/kg
Refractive Index:	1.721
Oil Absorption:	58 ml oil / 100 grams pigment
Health and Safety	No acute or known chronic health hazards are associated with this product’s anticipated use (most chemicals are not thoroughly tested for chronic toxicity). Protect yourself against potentially unknown chronic hazards of this and other chemical products by keeping them out of your body. Do this by avoiding ingestion, excessive skin contact, and inhaling spraying mists, sanding dust, and vapors from heating. Conforms to ASTM D-4236.

For a detailed explanation of the terms in the table above, please visit Composition and Permanence.

Origin and History

The first azo dye, tartrazine yellow, was patented in 1884. The azo dye makes tartrazine yellow lake, PY100, still used in some artists’ paints. β-naphthol azo pigments were first introduced from 1895 to 1911 and are still in production. The first Hansa yellow, PY1, was patented in 1909, and the first diarylide was synthesized in 1911. Because their importation from Germany was forbidden during World War I, American manufacturers began to study azo dyes in depth. Azo pigments have become the largest class of synthetic organic pigments because of their ease of preparation and wide range of colors. Diarylide yellow pigments are made in a color range from greenish- to reddish-yellow shades.

Diarylides were not widely used until almost twenty-five years after their synthesis in 1911. At that time, they were sold as pigments for rubber under the trade names Vulcan Fast Yellows and Oranges. Diarylides are an important class of azo pigments and now account for approximately 80 percent of all yellow pigments. They are primarily used in printing inks, where twenty-five thousand metric tons were used in 1989. 

Diarylide Yellow, PY83, also known as Permanent Yellow HR, is more non-bleeding and lightfast than other diarylide yellows. Introduced in 1958 by Hoechst, it is a reddish-yellow pigment used in plastics, printing, and artists’ paints.

Source

Diarylides are synthetic organic pigments formed by the coupling of tetraazotized benzidines with acetoacetarylides. They are diazo compounds with a backbone structure based on 3,3'-dichlorobenzene.

Permanence and Compatibility

Due to their higher molecular weight, diarylides have approximately twice the tinting strength of monoarylides and show improved bleed resistance and thermal stability.

Oil Absorption and Grinding

Diarylide yellow absorbs a large amount of oil. For every 100 grams of diarylide yellow, 58 grams of linseed oil is needed to form a coherent paste, and this pigment has an oil absorption value.

Toxicity

Diarylide yellow is not considered toxic; however, care should be taken when handling the dry powder pigment to avoid inhaling the dust. All toxicological studies showed no signs of toxicity to humans or the environment.

For more information on handling pigments safely, please visit How to Safely Handle Art Materials and Pigments.

Ecology

Diarylide yellow is an organic pigment that contains inadvertent polychlorinated biphenyl (PCB) or dichlorobenzene (DCB) compounds.