Disperse dyes containing a built-in oxalanilide stabilizer

Monoazo and nitrodiphenylamine disperse dyes containing an oxalanilide photostabilizer have been synthesized and evaluated for lightfastness as potential automotive dyes. The results showed that the lightfastness of CI Disperse Red 167 could be appreciably enhanced, depending on the substituent employed in the oxalanilide moiety. While it was also possible to improve the lightfastness of CI Disperse Yellow 86, the resulting lightfastness was not as high as that observed when a hydroxybenzophenone stabilizer was incorporated.