Lithole® Fast Yellow

The first isoindoline pigment appeared on the German market in 1973 Lithol Fast Yellow 1840 (P.Y. 139), manufactured by BASF. 

Only one of them was launched as a regular commercial grade by BASF in 1973 Lithol Fast Yellow 1090, the reaction product of 8-ammoquinaldine (10) with 2 equivalents of tetrachlorophthalic anhydride (11). 

Only after o-phthalodinitrile became available in high purity on an industrial scale from BASF the importance of these pigments was recognized. By improving the methods of synthesis and finishing it became possible to produce pigments with brilliant hues and better fastness properties. In 1973 BASF released the first isoindoline pigment into the market Lithol Fast Yellow 1840 (P.Y. 139). At the same time several other companies (Bayer, Ciba, Dainippon Ink) published novel isoindoline structures [8- 11]. 

Technical Observations. Permanent red 2G (lithol fast orange R) is, like Hansa yellow, a valuable pigment color having outstanding fastness to light and very good oil and spirit fastness. 

Azo dyes Allura Red AC, Amaranth, Azorubine, Brilliant Black BN, Brown FK, Brown HT, Lithol Rubine BK, Ponceau 4R, Red 2G, Sunset Yellow, Tartrazine Triarylmethane (triphenylmethane) dyes Brilliant Blue FCF, Fast green FCF, Green S, Patent Blue V... 

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