ARTICLE

Scott Hetizman
Sun Chemical Corporation
Performance Pigments
Plastics Business Unit
scott.heitzman@na.sunchem.com

Organic Yellows for Plastics

Cincinnati -- It’s time for a transition, from reds and violets to yellows. This was a difficult job to obtain - all I had to do was promise to keep the Henry Ford theme going. We will see how that works out.
The subject of this issue will be organic yellows. I will review an abundance of yellows made using a variety of chemistries. We have a considerable amount of ground to cover so let’s get that Model T rolling. P.S. Henry would not be happy with such a broad selection but may be comforted by the fact that several chemistries would not meet today’s automotive requirements.

Mono Azo Yellows
These yellow lake pigments are synthesized by adding the diazotized amine to a coupler. The dye is then precipitated by forming a less soluble Ca salt. Most are designed with a large particle, for an organic pigment. As you know, large particles offer good opacity, heat stability and dispersion but compromise the tinting strength...
Major applications are low to medium performance film, fiber and injection molded products in olefins. They also exhibit good migration resistance in PVC. The most common red shade is Pigment Yellow 62 and its counterpart on the green side is Pigment Yellow 168.

Click to see entire article