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New Biodegradable PTT Biomax TPS

Bio-sourced materials for packaging have been introduced by DuPont using its own PTT (poly trimethyl terephthalate) technology and also the starch-based polymers from Plantic of Australia, with which DuPont set up an alliance last year.

New Biomax PTT 1100 has up to 35 per cent renewably-sourced content and is intended for injection moulded packaging in applications where polyesters are used now. Its attributes include good gloss, stiffness and colorability. DuPont says it is not affected by exposure to common liquids, it has high tensile and yield strength, and is opaque-to-translucent in its natural state. Performance is similar to that of PBT and PET.

The Plantic material, sold by DuPont as Biomax TPS, is a thermoplastic starch thermoforming sheet with 85 - 90 per cent renewably-sourced content and is also available in an injection moulding grade.

DuPont says it performs as well as polystyrene and PVC in thermoformed parts such as packaging trays and rigid containers for food and confectionary products, and in moulded parts such as cosmetics and personal care products, outdoor lawn and garden products packaging, and other formed articles intended for short life and easy disposal. It can also replace PET and polypropylene.

Biomax TPS is made from a high-amylase starch feedstock that is not genetically-modified. In sheet form it is certified to EN 13432 and ASTM 6400 standards for home, soil, water and industrial composting and is biodegradable when contacted by water. It is food contact approved in the United States and EU compliant for food contact. Performance attributes include inherent grease and oil resistance, which lends the product to thermoforming applications for greasy or fatty foods. DuPont says it also forms a strong flavour and odour barrier. Because it is naturally anti-static and anti-dust attractive, it can be used as a tray package for sensitive electronic components. Biomax TPS sheet is offered in seven gauge thicknesses and four colours.

In injection moulded parts, Biomax TPS is certified to EN13432 and BPI for industrial composting. Five grades will be available at first, starting with a general-purpose grade and a high-flow grade for thin wall parts, and then a stiff engineering grade and two water-resistant grades.