BIO-BASED POLYMERS | MATERIALS
and wear resistance. In addition, PA56 has been observed to have inherent flame resistance (limit- ing oxygen index is 32-34%). Cathay has formulated various products based
upon PA56. The tables show four formulations, suit- able for injection moulding, and how they compare with virgin resin or PA66 formulated to have similar properties. Flame retardance of a UL-94 V-0 for PA56 was achieved without compromise of other key func- tion properties. Impact resistance was obtained by compounding with glass fibre. The tensile strength of PA56b, the virgin resin, is considerably higher than that normally obtained for PA66, and provides an example of the molecular weight achievable for PDA-based polyamide due to the greater flowabil- ity at high sheer. In heat ageing tests, PA56 showed the same
reduction of tensile strength as a PA66. Finally, di- mensional stability of PA56 in both the flow and transverse axis is superior to that of PA66. “The polymerisation potential for PDA has only just begun,” says Kedo. “In addition to the market benefit of having 100% of its car- bons from renewable sources, this unique monomer imparts benefits which provide the compounder and injection moulder a competitive advantage.” Strictly speaking, it is not a biopolymer, but Desmopan 37385A from Covestro does have some attractive environmental credentials. It is the first thermoplastic polyurethane (TPU) containing polyether carbonate polyols produced with the aid of CO2
Bioplastics used for youngsters’ toys
When it comes to bio-polyolefins, users like the sustainability that they confer. In terms of properties, there is no difference at all between a polyethylene or a polypropylene made using ethylene from sugar cane, and one using ethylene from fossil-based oil. This likely explains why numerous new users of Braskem’s
sugar-derived “I’m green” polyethylenes are producing consumer products – and consumer products for kids. Viking Toys in Sweden uses the material for its Ecoline range, which it says “combines Viking Toys timeless design of durable and non-toxic toys with an oil-free, plant-based material made from sugar canes.” Another customer, Dantoy in Denmark, says it is launching a new line of bioplastic products, “thereby enlarging our already eco-friendly selection of plastic toys.” These two launch- es come after Lego also began using the Braskem polymer for some products (see Injection World March 2018). Beyond toys, packaging is another important target market for Braskem. Last year, United Caps, headquartered in Luxembourg and with production units across Europe, said it had collaborated with Braskem to deliver bio-sourced plastic caps and closures as an addition to its portfolio. It has started with two standard closures: the Victoria, a 30/25 screw closure designed for still
. Covestro says its mechanical properties are at least at the level of conventional TPU grades of
drinks; and Proflatseal for dairy products and still drinks.
Follow us on...
Be the first to know when we publish a new edition, plus updates on our conferences and useful links.
www.twitter.com/plasticsworld
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64
