additives feature | PVC stabilizers
Dow Plastics Additives is
responding to requests for
improvements to capstock compounds
stabilizer, the “S-granule,” produced via extrusion and underwater granulation. “The continuous manufacturing process at low temperatures ensures that there are no secondary reactions between important stabilizer components during the production process, thus allowing wide based formulation flexibility,” says IKA. The company claims that this is an advantage compared to the classical “melt tablet” stabilizers and that the S-granule shows similar properties in terms of abrasion and, unlike granules compacted from powder, is dust-free. For highly filled rigid PVC profiles, Adeka has
developed the ADK Stab RX-200 series of Ca-Zn powder stabilizers. The company says that the grades provide “excellent weatherability, well-balanced mechanical properties, superior heat stability as well as good colour retention”. They are also said to allow for a wider processing window compared to lead-based stabilizers. Adeka adds that it is also launching phenol-free
phosphites for PVC building materials such as flooring, wall paper and profiles. The phosphites, which are used in liquid stabilizers, are said to provide excellent colour retention, heat stability, and transparency. “We have been seeing a high level of concern in the
stabilizer market over nonyl-phenol and VOCs,” says Ron Raleigh, marketing and technical service chemist at US company Valerus Specialty Chemicals (formerly the Polymer Additives Division of Ferro). “This primarily stems from the EU’s SVHC and California Prop 65 listings.” He says that Valerus has responded with liquid stabilizer products “specifically designed to remedy those concerns with low-VOC and low-phenol composi- tions and little sacrifice in efficacy.” Raleigh adds that in the lubricants arena there is a
“subtle shift” to non-GMO sourced stearate materials. “We are currently developing options for those looking for only non-GMO sourced materials.”
PVC water pipes are an important market for Ca-based stabilizers
Better capstock compounds Dow Plastics Additives cites a renewed interest for improvements to capstock compounds in North America. “This trend continues to expand as the performance benefits of new applications for PVC roof
technologies are recognized,” it says. “Customers in the segment seek better performing compounds to deliver a high-quality, weatherable surface.” Dow says acrylic capstock resins, such as Acryligard CS-132, are combined with PVC polymers to meet key performance drivers, including improved weatherability, impact resistance and flame retardance. “Home owners have long sought a way to add colour
to their windows; until recently, paint-on vinyl windows were the answer,” the company claims. “A desire for more durable coloured windows in the Asia-Pacific region has led to the development of new coextrusion colour technologies, such as Acryligard CS-132 [which] adds a protective layer to vinyl windows, preventing discoloration under weathering conditions.” Dow also says that foamed PVC construction
materials continue to grow in popularity in many regions. “As final product densities reach minimums, manufacturers of these materials have made compound cost reduction a priority.” The company says it is developing ultra-high molecular weight process aids, “which will offer increased efficiency and the ability to lower compound cost.” It cites Paraloid KM-376, which it says is a highly efficient impact modifier, to better meet the needs of this market.
More information AMI’s PVC Formulation 2016 conference is being held in Cologne, Germany on 5-7 April. For information on participating in the event as a delegate, speaker, exhibitor or sponsor, please visit
http://bit.ly/PVC2016.
Click on the links for more information: ❙
www.stabilisers.eu (ESPA) ❙
www.vinylplus.eu ❙
www.reagens.it ❙
www.noracadditives.com ❙
www.ika-wolfen.de ❙
www.adk.co.jp/en/ ❙
www.valeruschem.com ❙
www.dow.com/additives/
26 COMPOUNDING WORLD | June 2015
www.compoundingworld.com
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