ARTICLE

Edwin B. Faulkner
Director - Comm. & Regulatory Affairs
Sun Chemical Corp
ed.faulkner@na.sunchem.com

Organic Reds for Plastics - Miscellaneous High Performance Reds

Cincinnati -- Henry - we're back! In the last two issues, we reviewed the two most important classes of organic red pigments that are used in the coloring of plastics - Azo Reds and Quinacridones. In this issue we are going to cover the final phase of red color space by reviewing a group of miscellaneous High Performance Organic Reds. As was mentioned in the last issue, Quinacridones are the "workhorse" HP reds for plastics, but there are a number of other HP reds that are used because of their unique color or physical properties. None of the pigment types reviewed in this article come anywhere near the commercial importance of the Quinacridones from a volume usage standpoint. The pigments to be reviewed in this issue are Perylenes, Disazo Condensations, Anthraquinones and DPP's.

Perylene Pigments - This class of High Performance Pigments has it's origins in vat dye chemistry, dating back to the early part of the 20th century. It wasn't until importance of higher performance organic pigments grew in the 1950's that the "ancient" vat dye chemistry was used to develop the Perylenes as a class of High Performance Pigments. Harmon Colors, now a part of Sun Chemical, Hoecsht, now a part of Clariant and BASF all developed pigments based on the core structure.

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