Pigments diarylide

Diarylamines Diarylide pigments Diarylide yellows Diaryliodomum... 

P.Y.193 produces dull reddish yellow shades. In printing inks the tinctorial strength is extremely weak. Thus, in offset printing inks it exhibits only about half of the tinctorial strength of the weak P.Y.191 in a distinctly redder shade and compared with the diarylide pigment P.Y.83, it produces only about a sixth of the strength. 

One area which requires special comment is a study (13) which showed that certain diarylide pigments processed in polymers above 200°C and particularly above 240°C decompose to give off 3,3 -dichlorobenzidine, an animal carcinogen. As a consequence diarylide pigments (not, however, condensation disazo pigments) are not recommended for use in any applications where they might be exposed to temperatures exceeding 200°C. 

Diarylammes Diarylide pigments Diarylide yellows Diaryliodoruum... 

Diarylide Pigments. Studies published in the early 1990s showed that these pigments can decompose at temperatures in excess of 200°C, liberating hazardous com-... 

Samples of 275-0049 Diarylide Pigment Yellow 13 and 275-0570 Diarylide Pigment Yellow 83 were supplied by Sun Chemical. 

Letter from the Dry Color Manufacturers Assoeiation Diarylide Pigments Committee (August 14,1990). 

Secondly (in the mid-nineteen seventies), specific OSHA standards, for the safe handling of thirteen human and animal carcinogens. Included in the list is dichloro-benzidine, a key raw material for the manufacture of diarylide pigments, regulated imder 29 CFR 1910.1007. 

Replacement of cadmium pigments and diarylide pigments is due to toxicological limitations in certain applications. 

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