additives feature | Film applications
Performance of Palsgaard PolymersPGE 8100 in a cold fog test (23°C, 50% rh) on 50-micron LDPE fi lm, in comparison with a refer- ence additive
to our successful range of Armostat antistatic agents, all based on renewable raw materials,” says Michiel Floor, global market segment leader for AkzoNobel’s Polymer Additives business. “These have improved performance in various fi lm applications, including an increased life span in agricultural fi lms.” Tosaf recently expanded its line of anti-fog master-
Hot fog test with Croda’s AtmerTM 7373 anti-fog additive (right) after two hours at 60°C
batches with four advanced grades, all of them food contact approved. The company says that they are formulated to create fast-responding and long-lasting anti-fog activity in various polyolefi ns, including metallocene polyethylene, linear low-density polyethyl- ene, polybutene, and polypropylene resins. AF4953LL is intended for multi-layer high-barrier packaging applications, including fi lms with a high amount of metallocene LLDPE. This grade is said to provide very good initial and prolonged anti-fog activity. AF5979PE was specifi cally developed for high-clarity barrier fi lms. Tosaf says its AF6851LL grade is for applications with sealing layers containing polybutene (PB-1), while AF2327PP is specially tailored for PP barrier fi lms. “Beyond meeting the challenges of this
demanding application, this grade offers outstanding processability and excellent activity even after lamina- tion”, says Asaf Eylon, Tosaf’s vice president for international marketing and sales. Croda’s newest anti-fog additive, AtmerTM 7373, is a
40% concentrate for polypropylene food packaging. Proven in tests to be effective in both hot and cold fogging applications, Atmer 7373 works by preventing droplet formation on plastic surfaces, keeping food looking fresher for longer. According to Adam Maltby, Croda’s polymer additives
applications manager, Atmer 7373 is effective in most grades of polypropylene, and results have been particularly good in homopolymer. “We have not seen any other product on the market that delivers such effective performance in both hot and cold fogging environments,” he claims. The product’s formulation is said to overcome many
of the processing diffi culties encountered when using traditional additives at the levels needed to impart effective anti-fogging. Typical processing problems can include screw slip or over-lubrication in the extruder barrel, and excess fuming. Packaging is failing in its job when consumers are
frustrated in their attempts to open a package, or if they cannot even view the product inside the packaging due to condensation on or a hazy appearance of a packaging fi lm. So says PolyOne, another supplier of anti-fogs. It adds: “Consumer research has shown that ‘Preservation date unreadable’ (66.6%) and ‘Diffi cult to open’ (64.4%) are consumers’ two leading complaints with food packaging. Consumers usually don’t complain if they have trouble opening a package; they just stop buying it.” Cooperation between polyolefi n supplier Borealis
28 COMPOUNDING WORLD | January 2015
www.compoundingworld.com
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