A new development in die-drawn polypropylene building profiles will be introduced by Dow Chemical Co., Midland, Mich., in a paper at the SPE ANTEC conference, which will be held concurrent with the NPE 2009 show in Chicago next month. The paper by Dow development leader Kevin Nichols will describe new technology to make stiff, lightweight profiles on a production scale using roughly 50% talc-filled PP. Air is incorporated in the profiles by cavitation induced by the die-drawing process, which pulls the material through a special compaction die at a temperature below its softening point. Die-drawing of mineral-filled profiles can be done at speeds of over 24 ft/min, based on full-scale tests on Dow’s pilot line. Profiles achieve flexural modulus from 200,000 to 700,000 psi, according to recent patent applications (e.g., U.S. 20080287576), and achieve a density less than 0.7 g/cc. The profiles look just like oak boards, Nichols says. Dow’s die-drawing technology uses a solid-state deformation die developed by Dow and researchers at Michigan State Univ. and the Univ. of Bradford in the U.K. Meanwhile, Weyerhaeuser Co., Federal Way, Wash., has been working on die drawing of cellulose-filled PP. Its patented technology reportedly can make lighter boards of 0.68 g/cc. (989) 638-0559 • www.dow.com
Dow Chemical Company
Specialty Plastics & Elastomer
PO Box 1206 Midland, MI 48642
Phone (989) 832-1426 Fax (989) 832-1465
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