Modifying PVC with Bio-Based PHA Rubber
A new class of renewable and very efficient multifunctional modifiers for PVC has been developed at Metabolix. This series of biobased PHA (polyhydroxyalkanoate) copolymers offers toughening, plasticization, and improved processing of all types of PVC compounds. They also have good UV stability and transparency, do not promote biodegradation, and are fungi resistant. Because of their unique miscibility with PVC, the PHA modifiers do not migrate, extract, or volatilize, and they are easy to handle and process at the same conditions as PVC. They offer a new, simplified approach to PVC formulation in which multiple processing and modifying additives could be replaced with a single product, eliminating both undesirable additive interactions and the need to stabilize unstable ingredients.
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