ATH-Filled EVA

In addition to vinylsilanes, ATH- and MDH-filled ethylene vinylacetate copolymers can be effectively coupled to aminosilanes [37]. Fine and uniform ATH dispersion in the polymer leads to low H FFR compound viscosities (M FI) and high tear strength. The use of 3-aminopropyltriethoxysilane became an industrial standard for the production of reliable thermoplastic HFFR compounds. New primary/secondary aminosilane blends provide further improvements in the final HFFR compound [38]. Aminosilanes are also found in thermoplastic EVA, nonperoxide cross-linked. 

Properties of different EVA/ATH formulations are summarized in Table 4.5. The basic formulation contained 160 phr of ATH, Iphr stabilizer (Irganox 1010, Ciba), and 1.5 phr aminosilane based on filler preblended with EVA. Compounds were made in a corotating twin-screw extruder and test specimens were produced from extruded sheets. 

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Table 6.2 A comparison of various unsaturated acids and three organofunctional silane coupling agents as surface modifiers in 60wt% ATH -filled EVA [16],...

Table 6.3 The effect of antioxidant and peroxide on the performance of an unsaturated acid in a 60% w/w ATH-filled EVA [16],...

Table 6.4 Influence of an unsaturated oligomeric acid on processing speed and mechanical properties in a twin-screw extruder compounded 60% w/w ATH -filled EVA system.

U.S. patent, disclosed that a highly filled combination of ATH and unspecified zinc borate in an EVA cable produced a much lower optical transmission signal loss than a conventional fluoropolymer in an optical composite cable application (Table IV). 

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