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November Chementator Briefs

By Edited by Gerald Ondrey |

  New block copolymer Nexar is the tradename of a block copolymer product recently commercialized by Kraton Performance Polymers (Houston; www.kraton.com) that has unique water-transport properties. Building on its earlier work in anionic polymerization of styrene-butadiene block copolymers, the company has developed a sulfonated, multiblock copolymer that allows a high level of selective moisture flow. Kraton vice president of technology Lothar Freund suggests that the hydrophilic sulfonate groups form “ionic channels” that facilitate water transport, and that can be adjusted based on polymer morphology. Nexar polymers are targeted for applications in membrane filtration systems and for high-performance breathable fabrics, including protective garments that can allow moisture transport while blocking harmful chemicals. New Z-N catalyst Last Month, The Dow Chemical Co. (Midland, Mich.; www.dow.com) introduced Consista C601 Polypropylene Catalyst, the first sixth-generation Ziegler-Natta (Z-N) catalyst. The non-phthalate-based catalyst system requires no capital or upgrades to existing facilities, and enables polypropylene producers to make differentiated, high-performance resins. The new catalyst was used in production…
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