New Olefinic TPEs for films, fibers, molding.A new family of propylene-ethylene TP elastomers reportedly features a unique chain microstructure mi·cro·struc·ture n. The structure of an organism or object as revealed through microscopic examination. microstructure Noun a structure on a microscopic scale, such as that of a metal or a cell that provides films, fibers, and molded pads with an outstanding combination of clarity and heat-seal performance plus elasticity, softness, processability, and compatibility in blends with other polymers. "Versify ver·si·fy v. ver·si·fied, ver·si·fy·ing, ver·si·fies v.tr. 1. To change from prose into metrical form. 2. " plastomers and elastomers were recently unveiled by Dow Plastics, Midland, Mich. Full commercialization is planned for the second half of 2004. Dow is targeting producers of flexible films and rigid packaging, as well as compounders of TPEs and TPOs. These resins are the product of new Insight "post-metallocene" catalysts and Dow's solution process. The novel catalysts are said to produce resins different hum those made with Z-N or metallocene catalysts. Versify polymers have narrow molecular-weight distribution but broad composition and crystallinity distribution, which is said to result in improved heat resistance compared with metallocone-based products of comparable olefin olefin (ō`ləfĭn) or olefin series: see alkene. olefin or alkene Any unsaturated hydrocarbon containing one or more pairs of carbon atoms linked by a double bond (see content. Broad crystallinity distribution results in a broad melting range melting range, n See range, melting. . A high melting shoulder is maintained even as the overall crystallinity of the polymer decreases. Versify polymers also have outstanding acceptance of fillers. Adding 50% alumina alumina (əl  `mĭnə) or aluminum oxide, Al2O3, chemical compound with m.p. about 2,000°C; and sp. gr. about 4.0. trihydrate achieves UL 94V-0 with only a 5% to 10%
increase in viscosity vs. more than 90% higher viscosity when ATH is
added to other polyolefins.
Twelve initial grades have a density range of 0.858 to 0.888 g/cc, MFRs of 2 to 25, glass-transition temperatures of -15 to -35 C, and melting points of 50 to 135 C. Their flexural flexural pertaining to the flexure of a joint. flexural deformity fixation of joints in flexion. In the newborn called contracted calves or foals. moduli range from 1000 to 40,000 psi and Shore A hardnesses are 50 to 75. Versify resins reportedly produce blown and cost films with excellent clarity and sparkle. Their self-touch feel is dry and non-rubbery, and they have low-noise characteristics. For rigid packaging and consumer durables Consumer durables Consumer products that are expected to last three years or more, such as an automobile or a home appliance. consumer durables See durable goods. , they provide low heat-seal initiation temperature and a broad sealing window. The soft-touch feel is expected to generate interest for bottles and medical/hygiene products. Other potential uses are TPEs and TPOs for coated fabrics, artificial leather, grips, and flexible roofing membranes. Tel: (800) 441-4369 www.dowersify.com |
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