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From Science & Research

From Science & Research magnetic_148, 175.00 lpi 15.00° 75.00° 0.00° 45.00° 14.03.2009 10:13:31 Prozess CyanProzess MagentaProzess GelbProzess Schwarz Magnetic for Plastics • International Trade in Raw Materials, Machinery & Products Free of Charge Figure 2. Selected catalysts with neutral donor ligands Targeting simpler and cheaper donor systems, very recently, zinc complexes of peralkylated amines came into the focus of research: they are derived from lowpriced starting materials and convince by high ROP activity at 150°C to molecular weights of 65000 g mol -1 at PD of 2 [34,35]. Parallely, the donor class of oxalic amidines has been investigated for the stabilisation of zinc complexes in the polymerisation of lactide which opens up a new neutral N-donor ligand class [36]. An oxalic amidine zinc chlorido complex yields polylactide with 50000 g mol -1 at PD of 1.4. • Daily News from the Industrial Sector and the Plastics Markets • Current Market Prices for Plastics. • Buyer’s Guide for Plastics & Additives, Machinery & Equipment, Subcontractors and Services. • Job Market for Specialists and Executive Staff in the Plastics Industry The comprehensive concept of robust N donor zinc systems has been proven to yield efficient and versatile ROP active catalysts. In general, the importance of neutral ligands for the ring-opening polymerisation of lactide cannot be underestimated. With regard to the major breakthrough of bioplastics for the substitution of petrochemical plastics in the commodity market, every robust catalyst system represents a huge step towards greater sustainability of our society. Up-to-date • Fast • Professional A complete list of the quoted references can be found at 38 bioplastics MAGAZINE [03/13] Vol. 8

Materials Innovative biopolymer blend An innovative PLA based blend with improved toughness and durability is close to reaching the market. The material, named Floreon was developed under a TSB funded knowledge transfer partnership between materials scientists at the University of Sheffield and CPD plc, a leading UK distributor of office water cooler bottles. Floreon is intended as a replacement for polyethylene terephthalate (PET) in CPD’s 15 litre water bottles, but has also shown promise as a cutting/printing substrate for applications such as key cards and horticultural labels. A plant pot label made from Floreon CPD’s existing PET bottle Water cooler bottles present a promising application for this material as they are distributed in a closed loop system. It is intended that the improved durability will make the bottles suitable for reuse, allowing the bottles to go through many cycles of use before further conversion. The team are now exploring the use of reground bottles in extruded sheet applications for cutting and printing, or even reconversion into bottles. When extruded as sheet the material cuts well and is also a good substrate for printing. Floreon sheet items have excellent mechanical performance and feel and the challenge now is to make the material cost competitive. The use of recycled PLA as a base material for Floreon has been trialled with promising results and the aim is to match the price of current materials whilst offering better performance and a range of end of life options. Floreon is unique in comparison with other PLA based blends due to its simplicity and versatility. The patent pending blend uses small quantities of commercially available biodegradable (certified to EN13432) thermoplastics which enhance the mechanical performance of PLA whilst also making it easier to process. The material has passed independent food contact testing with a range of aqueous and fatty food simulants. A further innovation in the works is the use of self-sanitising additives with Floreon. Polycarbonate (PC) bottles can go through hundreds of cycles of reuse, being washed at ~60 °C before each refill and using strong detergents and chemicals. The inclusion of additives to prevent biofilm formation would reduce or alleviate this need saving large amounts of energy throughout the bottle life. Initial tests with additives that inhibit microbial growth have shown promising results when combined with Floreon. This could provide an alternative to reusable bottles made from PC, a material associated with health concerns due to the leaching of bisphenol A. The project has also been funded by the REY programme, which is delivered by the low-carbon consultancy CO2Sense and part-funded by the European Regional Development Fund. CO2Sense help businesses and public-sector organisations cut their greenhouse gas emissions and costs, and have accelerated the project with funding to purchase materials and tooling for production trials. bioplastics MAGAZINE [03/13] Vol. 8 39

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