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For PIGMENT YELLOW 191, everyone has different special concerns about it, and what we do is to maximize the product requirements of each customer, so the quality of our PIGMENT YELLOW 191 has been well received by many customers and enjoyed a good reputation in many countries. honor pigments, organic pigments supplier, quality products from china PIGMENT YELLOW 191 have characteristic design & practical performance & competitive price, for more information on the PIGMENT YELLOW 191, please feel free to contact us.
    Pigment Yellow 191 P.Y.191 displays excellent solvent fastness in aliphatic and in aromatic hydrocarbons, as well as in the commonly used plasticizers. The pigment is almost completely fast to alcohols and esters but not to water, ketones and methylglycol. P.Y.191 is also used for hot melting traffic paints in the USA. Four new crystal modifications of P.Y.191 have been described supplementing  the known alpha-phase. Phase conversions were achieved by solvation of the alpha-phase in high boiling organic solvents with subsequent cooling: the-phase by recrystallizing from NMP (180°C), DMAA or DMSO; the alpha-phase from diethyleneglycol dimethylether (150–170°C), the alpha-phase from ethyleneglycol (170–200°C) and the alpha-product from DMF.