COMPATIBILISERS | ADDITIVES
processability and properties so that higher levels of recycled content can be added to a blend. For example, MaxiLoop HP7AB4780COM Compatibi- liser improves processing when using recyclate from multilayer films of PE or PP containing PA or EVOH as a barrier layer. Avient’s Cesa Unify A4R Polyolefin Compatibi- liser was a finalist at last year’s PRSE awards in Sustainability Technology in Packaging, submitted in collaboration with recycler PreZero and convert- er Jelenia Plast. The compatibiliser helps create a homogenous mixture of PP and PE, allowing greater use of recycled polyolefins.
Catalysis in the melt Titanium-aluminum (Ti-Al) chemistry pioneered by Kenrich Petrochemicals acts as a catalyst to compatibilise materials and is effective in PCR. Ken-React CAPS KPR catalyses a mix of recycled polymers in the melt in the extruder so that they repolymerise and copolymerise, said Sal Monte, President of Kenrich Petrochemicals. If there are organic or inorganic materials in the melt, such as carbon black or mineral fillers, the Ti-Al acts as a coupling agent at the interface between the filler and the polymer. The additive, in a pellet or powder masterbatch
form, dosed at 1.5-1.75% by weight, makes all the materials in a recycled mixture compatible with each other, explained Monte. To maintain the shear rates needed for reactive compounding with the catalyst, mixing conditions in the extruder must be optimised, typically by lowering temperatures by approximately 10%. The additive works to compati- bilise all polymer types 1-7, Monte said. The Ti-Al
additive is also synergistic with other types of compatibilisers (eg copolymers or maleated PP). Monte’s research has shown that, using the
Kenrich additive, PP and PE can be made compat- ible at any ratio, with no delamination. Other work demonstrated in situ compatibilisation of PP and HDPE (two incompatible addition polymers) with PET (a condensation polymer). In 2024, Kenrich announced development of a new bio-based coupling agent, Ken-React KR PTOA, a titanate coupling agent manufactured from American pine-tree based oleic acid and intended for domestic supply. The company’s existing commercial plant-based titanate, Ken- React KR TTS, is based on isostearic acid derived from rapeseed. The new, experimental titanate is expected to function similarly, although it is a differ- ent molecule. The company has applied for EPA TSCA registration.
CLICK ON THE LINKS FOR MORE INFORMATION: �
https://interfacepolymers.com �
https://sk-fp.com �
www.dow.com �
www.clariant.com �
www.thecompoundcompany.com �
https://rise-pfi.no �
www.sintef.no �
https://kraton.com �
www.tisan.com.tr �
www.byk.com �
www.ingeniapolymers.com �
https://gabriel-chemie.com �
www.avient.com �
https://4kenrich.com
kai.hu@
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