Thursday, March 5th, 2015
A Different Kind of Conversation: SPI Member Kenrich to Introduce New Compatibilizer at NPE2015 that Gets Mixed Resin Streams “Talking to Each Other”
Long used in the prime resin industry to create special blends that give plastic materials desirable properties that any individual polymer would lack on its own, compatibilizers get resins that would not neatly blend together to “talk to each other,” as it were. Companies continue to explore new applications for compatibilizers in the recycling industry, where at least one SPI member is trying to start a similar sort of conversation between mixed recycled resin streams.
At NPE2015, SPI member, and member of the SPI Recycling Committee’s Technology and Equipment Subcommittee, Kenrich Petrochemicals (Booth #S20027) will introduce a new additive that can be used to recycle the mixed resin streams that are increasingly posing challenges to the world’s recyclers. The long name for the compatibilizer is Ken-React® CAPS ® KPR ® 12/LV Pellets, and KPR for short; it regenerates post-consumer recycled (PCR) plastic mixtures in the extruder melt and gives them virgin resin-like properties, all while getting dissimilar polymers to talk to one another.
Here’s some more technical information from Kenrich President Salvatore Monte, who invented KPR, about how the additive can be put to good use: “Normally—although polypropylene (PP) and high-density polyethylene (HDPE) are both considered olefins—HDPE cannot accept more than 5 percent PP without creating incompatibility issues. Add a third polymer and it really gets complicated.” The KPR® additive pellet can help make these issues disappear, which could provide a huge benefit to recyclers who, in an age of widening “single stream” recycling procedures, frequently have to handle various types of plastic materials that may be present in a recycling feedstream, or even in a single product. KPR® aims to change that.
“Conventional discussions on recycled plastic center around equipment that sorts, cleans, demagnetizes, washes, granulates, bales or melt processes recycling—or polymer compatibilizers based on maleic anhydride chemistry or bipolar thermoplastics that have affinity for two select recycle polymer streams,” Monte continued, referring to other additives with fewer potential applications than KPR. “Our new KPR® catalyst causes multiple polymers of divergent chemistry to repolymerize in the melt to form not alloys, but new complex co-polymers having much higher mechanical properties.”
SPI and its Recycling Committee have repeatedly urged plastics manufacturers and brand owners to consider PCR when making their materials decisions, for its sustainability bona fides and contributions to SPI’s goal of helping the industry achieve zero waste in manufacturing, among other things to recommend it. But part of what makes some companies reluctant to use PCR for all their plastic needs is that, in the process of being used and recycled, the plastic materials themselves lose some of the properties that make them desirable for use in consumer plastic products. However, compatibilizer manufacturers, like Kenrich, are attempting to offer a unique solution to the problem, by making it easier for recyclers to produce higher-quality materials from lower-quality bales.
“It’s a new way to look at PCR and achieve high loadings of PCR in virgin polymers to meet sustainability mandates in consumer plastic packaging products such as blow-molded soap bottles,” Monte said.