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Polymer Additives

ADDITIVE SELECTION TO REDUCE PINKING AND YELLOWING

Tech Paper | Supplied by BASF

Managing the color of a plastic article requires not only the appropriate selection of the colorants, but
also careful selection of the processing, thermal, and other plastic additives. Improper selection and use
of these additives can lead to the formation of chromophores and discoloration of the polymer after
processing, during storage, or upon exposure to heat or light. These chromophores may be either
transient or durable, leading to unexpected and difficult-to-manage changes in the article’s color during
storage and use.

The use of recycled polymer or regrind can exacerbate the potential for discoloration by
introducing chromophore precursor compounds formed by thermo-oxidative stress on the polymer
system. In this paper, common causes of discoloration and strategies to manage them through additive
selection 
are presented.

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