POLYAMIDE | ADDITIVES
Figure 1: Chart showing improvement in low temperature Charpy impact of PA6 using SK’s Lotader 4700 and its new ‘tubular technology’ version Image: SK Functional Polymer
cant formulation. Cevo-process A-3105 from Voelpker is a processing aid that is said to provide a synergistic combination of lubricating, release- and dispersing agents that can help in distributing the flame retardant additive evenly in the PA matrix. The A-3105 mixture was engineered especially for applications in PA compounding and is suitable for use in filled and reinforced compounds (where it can improve homogeneity of glass fibre distribu-
tion). It can also reduce PA degradation and promote improved surface quality. A recent study carried out by Voelpker found that using it to replace calcium stearate in a UL94 V-0 classified formulation could reduce the amount of flame retardant by around 20%. According to the company, in achieving the V-0 rating with a stand- ard lubricant such as calcium stearate requires a dosage rate of 12/5% melamin cyanurate in PA6 and 10% in PA66. Replacing the calcium stearate with Cevo-process A-3105 allowed flame retardant dosage to be reduced to 10% for PA6 and 8% for PA66. Comparable results are said to have been achieved with other halogen-free flame retardants such as phosphorus-based flame retardants. Lotader 4700T, from SK Functional Polymer
(SKFP), is described as a “highly reactive terpolymer specifically designed for high impact resistant polyamide compounds.” The new grade is produced using the company’s tubular technology (indicated by the T in the grade name) and is said to offer a higher melt temperature and improved dispersion in PA resins than the Lotader 4700 grade it is based on. According to SK, Lotader 4700T has been successfully tested in several polyamides, includ-
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