additives | PVC
while maintaining excellent impact performance, Kane Ace UF600 brings the perfect solution,” Braun claims. He says the additive is the sole gloss improving acrylic impact modifier available on the market. Kaneka has also added two transparent acrylic
grades of impact modifiers, Kane Ace FM80 and FM83. These have been designed to provide high impact resistance while keeping good clarity and transparency under various weather conditions.
Above: Testing additives from different resins with a roll mill at Emery Oleochemicals
“Being a blend of these two modifiers, the process-
ing of CAM grades lie between the two conventional modifiers with some grades processing similarly to either AIM or CPE,” the company says. “The end user can choose the most appropriate modifier system for their needs.”
AIM and CPE are blended at different levels to give
grades with a range of properties and performance. The supplier highlights the ability the new range offers to optimise cost and to adjust the performance ratio, as well as providing high impact efficiency even at low temperatures, excellent corner weld strength in window applications, good surface appearance and high gloss, and weather resistance. The main physical and processing properties of the
CAM range have been compared to standard AIM and CPE modifiers in a representative Ca-Zn stabilised white window formulation (see Table 1). This compari- son was carried out with constant mixing and extrusion conditions apart from small adjustments required to extrusion haul-off speed to maintain constant wall thickness.
Kaneka Belgium highlights its Kane Ace portfolio of impact modifiers, processing aids and specialty modifiers. It says it continues to innovate with methyl methacrylate butadiene styrene (MBS) impact modifi- ers, despite the relative maturity of the technology. But it has also developed what Technical Director Harald Braun says is an extremely high cost-efficient all-acryl- ic impact modifier, Kane Ace FM56, which “generates total formulation cost efficiency for outdoor and durable PVC applications.” Kane Ace impact modifiers are described as
core-shell polymers in which a rubbery core provides resistance to impact, while a grafted glassy shell provides rigidity and compatibility with the polymer matrix and maintains the desired shape and dispersibil- ity of the particles. “For AIM users seeking for an acrylic impact modifier, offering an ultra-high gloss behaviour
34 COMPOUNDING WORLD | June 2016
Alternative lubricants With many converters of PVC stabilisers moving to Ca-Zn formulations and away from the lead-based stabilisers that have afforded different requirements in lubrication, demand for high-performance lubricants has consequentially increased. Additives manufacturers have, therefore, had to develop new lubricants that not only improve the rheology of the PVC-melt, but also prevent plate-out behaviour and optimise the process- ing window of the formulation. Emery Oleochemicals has been focusing its develop-
ment efforts on solutions using innovative ester lubricants, says Harald Klein, Global Business Director, Green Polymer Additives. He says they are capable of making materials better and processing easier. He cites a new internal lubricant Loxiol G 59, which adjusts the flow of the PVC melt when working with complicated profile geometrics and injection mouldings. “Its excellent dispersing property of fillers has positive effects on the end product, such as a smoother surface and better gloss,” he says. External lubricants such as Loxiol G 24 and G 25 function as replacements for paraffin waxes and have low volatility, allowing for longer machine in-service times without interruption for cleaning. “Overall, the adjustment to an optimal rheology leads to faster production and higher output,” Klein says. For heat resistant applications, a different set of lubricants is necessary. In Asia and North America
Table 1: The notched impact strength of Add-Chem’s CAM range is similar to, or better than, conventional AIM and CPE systems Raw materials phr
Quantity,
K67 PVC Ti02
Calcium carbonate
Ca-Zn stabiliser ADD-Stab 55 AIM or CPE or CAM
100 4
10
4.5 7
Typical Ca-Zn stabilised white window profile recipe used for the CAM performance comparison trials
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