ADDITIVES | CLARIFIERS AND NUCLEATORS
cant improvement in mechanical properties, such as impact strength, elongation, crystallisation temperature and HDT (Figure 2). ADK STAB NA-B99 is said to perform well in a
variety of resins and formulations including homopolymer PP, impact copolymer PP and random copolymer PP, as well as PP compounds containing talc and/or carbon black. It can be used in applications such as automotive parts, pipes, trays and films. Adeka says that no discolouration issues are
Figure 1. XRD analysis shows 83% of beta-crystal is achieved in homopolymer PP using Adeka’s ADK STAB NA-B99 beta-nucleation system (compared with the total crystalline layer) at low addition rates Source: Adeka Polymer Additives
expected using the additive at standard PP processing temperatures and no limitations in coloured applications are foreseen. ADK STAB NA-B99 can also potentially contribute to improved sustainability. For example, the company says it can be used as an alternative to rubber impact modi- fiers in PP, improving recyclability in line with the trend towards use of mono-materials.
Mineral options Talcs can also provide good nucleation properties in plastics, while simultaneously improving flexural modulus, dimensional stability, and stiffness/impact balance. Imerys has developed Crys-Talc, a bright, cost-effective and highly efficient polymer nuclea- tion talc that it says can improve rigidity and impact resistance, increase injection moulding and extrusion output rates, and give good mixing behaviour and dispersion properties. According to the Polymers S&T team at Imerys,
Figure 2: Incorporation of 1,000ppm of ADK STAB NA-B99 in homopolymer PP delivers significant improvement in mechanical properties and HDT Source: Adeka Polymer Additives
saving energy by enhancing productivity. ADK STAB NA-21 and NA-71 provide PP with a dramatic improvement in transparency, as well as mechani- cal properties. The benefits of our alpha-nucleating agents are used in a wide range of PP applications including automotive parts, home appliances, trays and food packaging,” Morvillier says. “Our newly launched beta-nucleating agent ADK STAB NA-B99 now offers additional value to PP, particularly in providing greater toughness.” Adeka describes ADK STAB NA-B99 as a highly
efficient beta-nucleation system. X-ray diffraction analysis (XRD) shows 83% of beta-crystal is achieved in PP (compared with the total crystalline layer) at a low addition rate in homopolymer PP (Figure 1). The company says this leads to signifi-
58 COMPOUNDING WORLD | March 2023
Crys-Talc provides a nucleating solution for polymers such as PP, PA, polyesters and other semi-crystalline polymers. When used in PP, Crys-Talc is said to increase crystallisation tempera- ture and kinetics (Figure 4), improve injection moulding and extrusion outputs by 10-15%, and improve stiffness, strength and Izod impact performance (Figure 3). Used at higher addition rates, Crys-Talc can also act as a reinforcing agent, improving stiffness, impact resistance and heat distortion temperature. When used in PA resins, Imerys says Crys-Talc can significantly increase crystallisation tempera- ture compared to unfilled PA6 or PA6 filled with other minerals. The company says this allows the polymer melt to solidify faster, improves the throughput of industrial processes and reduces injection moulding cycle times.
Thermoforming gains US-based Mayzo offers a range of beta nucleating masterbatches for use in PP. The company says a number of customers that have incorporated its MPM 2000 product into their thermoformed PP
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