MATERIALS | COMPATIBILISERS
Right: Small electrical components (these are a few centimetres long) are target applications for rPET containing a new compati- biliser from Polymer Asia Technology
GMA as the active compo- nent, while MAH is incorpo- rated into PA-Bond 821. “Thanks to the functional
groups and unique polymer structure base of PA-Bond 821 and PA-Bond 948G, the physical properties – impact strength, flexural and tensile strength and modulus, elongation – of the compound are significantly improved. The saving in cost is high on top of using recycled material instead of first choice material.” Typical addition rates are 2-4%. Lotader reactive terpolymers and Lotryl copolymers previously produced by Arkema are now offered by French company SK Functional Polymer (SKFP), following the acquisition of Arkema’s Functional Polyolefins business last year by SK Global Chemical in Korea. The materials are mainly used as impact modifiers for polyamides, polyesters, PPS, ABS, and polycarbonate matrices, but they also offer good compatibilisation for polymer blends. The company has focused on evaluating Lotader resins as compatibilising agents for recycled plastics. SK says a good example is the use of Lotader AX8840 for recycled PET which contains polyole- fins not eliminated by the regeneration process or introduced intentionally in order to develop blends with improved properties. Lotader 4210 maleated grade is now offered as a compatibiliser of HDPE and EVOH blends. The company has also recently introduced a new range of highly heterogeneous Lotryl acrylate copolymers as boosters in styrenics recycled resins. In addition, SK acquired Arkema’s Orevac grafted polyolefins. Orevac CA100 has
been used as a compatibiliser when recycled PP is mixed with PA or PLA. SKFP, headquartered in
Paris, will lead the develop- ment, production, market- ing, and sales of the polymers globally. At The Compound
Company, a new grade of Yparex compatibiliser, 10403, is proving to be very effective in recycling PET-PE laminates. The company is also looking into new engineering concepts for multilayer materials with a so called
built-in (food-contact compliant) compatibiliser. The Compound Company, which traces its roots back to DSM, offers polyolefin-based coupling agents and compatibilisers with extremely low amounts of residual maleic anhydride. Frank Huijnen, Business Development Manager, Yparex, says the company is currently involved in multiple projects with companies working with post-con- sumer and post-industrial materials, all of them unique in nature. “The materials have different compositions and, most important, the quality requirements of the finished products vary,” he says. “We have shipped lots of samples, with different graft levels, different densities, different MFIs and so on, to numerous prospects now testing, evaluating, upscaling.” The Compound Company has two brands,
Yparex and EcoForte. EcoForte is used for com- pounds, while Yparex is applied not only to com- patibilisers but also to adhesives used as tielayers in various multilayer structures, as well as encapsulant in solar modules. In recent years, Yparex has broadened its portfolio with new compatibilisers.
Charts compare mechanical properties of 30% glass reinforced compounds of PET containing PA-Bond, and of PBT Source: Mitsui
46 PLASTICS RECYCLING WORLD | May/June 2021
www.plasticsrecyclingworld.com
IMAGE: POLYMER ASIA TECHNOLOGY
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