Pigments with Hitherto Unknown Chemical Structure

3 Pigments with Hitherto Unknown Chemical Structure 

The fact that many of these pigments have not even been assigned to any particular class makes it more convenient to list them by their shade in the order of increasing Colour Index Numbers. 

which is derived from the anthraquinone structure, is produced in Japan. It affords very reddish shades of yellow, even redder but at the same time distinctly duller than those of P.Y.83. P.Y.99 is recommended especially for use in textile printing but is also used in plastics. Although HDPE systems are heat stable up to 300°C, they noticeably lack tinctorial strength. 1/3 SD HDPE samples containing 1% TiOz are formulated at 0.53% pigment. 

The production of P. Y. 187 has recently been discontinued. It was a special-purpose pigment for polyamide. Thermostable up to 320°C in this plastic material, the pigment furnishes greenish yellow shades. 1/1 SD samples score only as high as step 4 on the Blue Scale for lightfastness. 

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Pigments with Hitherto Unknown Chemical Structure 579 Pigment Yellow 201... 

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