DA 3303 E hostanox P-EPQ 09.07 RZ

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Influence of NA-1 on the Stabilization of Polypropylene during Extrusion Data on the melt and color stability of polypropylene are shown in Figures 3 and 4, illustrating the effect of the nucleating agent NA-1 on the performance of the stabilizers Hostanox ® * P-EPQ ® , P-2 and P-4 respectively. By using 0.1 % Hostanox P-EPQ, optimal melt stability is achieved for five repeated extrusions. Its effectiveness as melt stabilizer is almost maintained also in presence of NA-1. The corresponding results for the color stability shown in Figure 4 support, furthermore, the preferred use of Hostanox P-EPQ also in nucleated polypropylene. It is evidently superior to the competitive phosphites P-2 and P-4. 4 MFR (g/10 Min.) at 230 °C, 5 kg 20 15 10 5 0 only BS+P-EPQ P-EPQ P-2 P-4 Procedure: Multiple Extrusion at 270 °C. Figure 3: Melt Stabilization of Polypropylene The distinct properties of nucleated polyolefins are significantly dependent on the chemical structure and the kind of nucleating agent applied. The typical heterogeneous nucleators, such as Hostanox 4030 or NA-3, are high melting, salt-like compounds which are primarily designed to improve crystallization kinetics and mechanical properties of a polymer. In contrast to this, dibenzylidene sorbitols like NA-1 and NA-2 are preferably used as clarifiers, i.e. for reduction of haze. 1 Pass 3 Passes 5 Passes Additives: BS: 0.05 % AO-2 + 0.1 % CaSt; 0.1 % Processing Stabilizer each; 0.25 % Nucleating Agent NA-1 each. Figure 5 shows the influence of processing stabilizers on the haze of polypropylene containing different nucleating agents. The formulations with NA-1 and NA-2 in Figure 5 are examples for highly clarified polypropylene. In such cases, processing stabilizers contribute only marginally to further improvement of the optical properties. However, if heterogeneous nucleators are used (Hostanox 4030 and NA-3 in Figure 5), the generally higher haze values can be clearly reduced in combinations with Hostanox P-EPQ.
Yellowness Index (on Plaques) 5 4 3 2 1 0 only BS+P-EPQ P-EPQ P-2 P-4 Procedure: Multiple Extrusion at 270 °C. Additives: BS: 0.05 % AO-2 + 0.1 % CaSt; 0.1 % Processing Stabilizer each; 0.25 % Nucleating Agent NA-1. Figure 4: Color Stabilization of Polypropylene Haze (%) 60 50 40 30 20 10 0 1 Pass 3 Passes 5 Passes only BS 0.1 % P-EPQ 0.1 % P-2 0.1 % P-4 NA-1 NA-2 Hostanox ® *-4030 ® Procedure: Haze measured after one Extrusion Passage. Specimens: 1 mm Injection Molded Plaques. Figure 5: Effect of Processing Stabilizers in Nucleated Polypropylene NA-3 Additives: BS: 0.05 % AO-2 + 0.1 % CaSt; 0.25 % Nucleating Agent each. 5
Page 1 and 2: Pigments & Additives Division Plast
Page 3: Nucleating Properties of Hostanox P
Page 7 and 8: Mode of Characterization Melt Flow

DA 3303 E hostanox P-EPQ 09.07 RZ

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