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The invention comprises water-insoluble trisazo dyes of formula wherein X is a hydroxyl group or a di-C1-C4 alkyl-substituted amino group and Ar is an aryl radical. They are used in the dyeing of polyolefins. In examples 1 mol of p 4-(41-amino- 21-methylphenylazo)- 1-...
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Dyes that contain it, along with other so-called “azo” dyes, are banned from import by the European Union. FromScientific American His scoring calls can be equally long-winded but distinctive: "gooaalll-azo azo azo!" FromUS News
Azo Dyes Product Regulations There are some EU-level regulations that restrict the use of azo dyes in consumer products like clothing, toys, food contact materials, and cosmetics. Below are examples of them. REACH REACH restricts the use of certain types of chemicals in consumer products, that ...
Substituents on the benzene, usually at the para position, affect the resulting colour of the molecule due to their contributions to the HOMO/LUMO orbital energies. Take a look at theazo-dyespage to view a selection of dyes and their HOMO/LUMO orbital representations. ...
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Azo dyes for dyeing leather in brown shades are obtained by coupling with m-phenylenediamine or a 4-substituted homologue or alkoxy or halogen derivative thereof in either order, (a) a diazoazo compound obtainable by coupling diazotized aniline or a homologue or chloro, nitro or sulpho derivat...
: containing three azo groups in the molecule trisazo dyes Word History Etymology International Scientific Vocabulary tris- + azo The Ultimate Dictionary Awaits Expand your vocabulary and dive deeper into language with Merriam-Webster Unabridged. Expanded definitions Detailed etymologies Advanced search...
Examples are azo dyes and aminoanthraquinones. The quencher compounds used in the switching layer of the device according to the invention may also be non-fluorescent dyes or dyes which only fluoresce in the NIR.In a preferred embodiment of the switching layer according to the invention, any ...