Performance Additives for PVC and PLA
Metabolix is launching its new line of amorphouspolyhydroxyalkanoate (PHA) grades to be used as performance additives for PVC and PLA. Production of the new materials is underway at a U.S. pilot plant and will ramp up to 600,000 pounds annual nameplate capacity during 2016.
Amorphous PHA (a-PHA) is a softer and more rubbery (low glass transition temperature or Tg) version of PHA that offers a fundamentally different performance profile from crystalline forms of PHA. Metabolix’s a-PHA is produced by fermentation and extracted using a patented solvent recovery process. The production process has been reviewed by EPA and recently cleared the Premanufacture Notice (PMN) requirement for new materials placed into commerce. Several certifications are pending on a-PHA as a biobased material and for the full range of biodegradation scenarios enabled when a-PHA is used alone or with other complementary materials. Metabolix plans to seek FDA clearance for a-PHA in food contact applications, which would further expand the range of PHA compositions available for use in food contact materials. Metabolix previously received FDA clearance for use of its semi-crystalline PHA grades in food contact applications.
At low loading levels, a-PHA can serve as a process aid and performance modifier for PVC. It increases productivity during processing and enhances mechanical performance, with the potential to also deliver cost savings in PVC material systems. In highly filled composite systems, the use of a-PHA enables increased use of wood pulp, mineral fillers and PVC recyclate to replace virgin PVC and achieve improved mechanical properties. Metabolix is working closely with customers on a wide range of applications utilizing a-PHA as a modifier for PVC. These applications include a floor backing material that utilizes PVC recyclate, a highly-filled vinyl flooring system, wire and cable insulation, roofing membranes, PVC/wood polymer composites and other construction and building materials.
Amorphous PHA also complements the bio-content and compostability profile of the biopolymer PLA while delivering significant improvements in mechanical properties such as increased toughness, strength and ductility.
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