MATERIALS | COMPATIBILISERS
“Efficient compatibilisers have the ability to disperse finely the EVOH phase into the PE matrix,” says Nico Esselin, Market Development Manager. “The most efficient compatibiliser was found to be a terpolymer of ethylene (89 wt%), butyl acrylate (6.5%) and maleic anhydride (3.8%). The terpoly- mer (Lotader 4210) showed the best results when used at loading of 2 to 5wt%.” Esselin says that compatibilisers with a relatively low fluidity (eg melt index of 10) were found to be best in their study of a recycled polyolefin/EVOH feedstock. For compounds from recycled multilayer films to
Adding a compatibiliser to a mixed recycled PE/EVOH compound improves the dart drop puncture resistance of a film. The chart compares films of blends containing an MAH grafted polyolefin, a terpolymer (Lotader 4210 from SKFP) and a high fluidity compatibiliser to a control film with no compatibiliser. Chart: SKFP
be reused in multilayer oxygen-barrier packaging, both mechanical and optical properties must be adequate. Addition of the compatibiliser has a positive effect on the mechanical properties, such as puncture resistance of the films made with this compound, Esselin reports. The compatibiliser also decreased the number of visible defects (gels) in the compatibilised blends of PE/EVOH (see charts). Based on these studies, SKFP is looking at solutions for several mixed plastics feedstocks, including PE/PA, PE/PET, PP/PA and PP/PET, says Esselin.
Adding a compatibiliser (Lotader 4210) reduced gels in a recycled, mixed PE/EVOH compound Chart: SKFP
PIR compatibilisers “We see increased development of film structures containing a latent compatibiliser for activation when the flexible packaging goes through the PE store drop-off recycling stream in the US,” says Dale McCormick, Business Manager, Masterbatch for Flexible Packaging at Ingenia Polymers. “This allows for barrier structures [eg with polyamide and/or EVOH] to be recycled and brand owners to meet their sustainability goals, more specifically by
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