Proprietary nucleating agents

The nucleation constant, Kg is related to the product of lateral and folding surface free energy and it represents the free energy which is needed in order to form a nucleirs of a critical size." For neat PP, nucleation constant was 1.95x10 and 0.433x10 for P-nucleated polymer with proprietary nucleating agent." ... 

To confirm it, PP resins with melt flow rates, MFR, from 0.3 to 40 dg min-1 have been produced [111]. Calcium pimelate, the proprietary technology of Borealis, has been used as a -nucleating agent. The grades were considered to be fully nucleated, since their / -content, measured by DSC (2nd scan, 10 K min-1), was about 80% ( 2%). Their performance was compared with that of the corresponding non-nucleated materials, which exhibit an almost pure a-crystalline structure. 

Types calcium stearate, microcrystals of noble metals, Safoam (proprietary composition of nucleating agent and foaming agent masterbatch in PVC), talc ... 

Figure 6.8. Dependence of the activation energy on the relative degree of crystallinity of neat propylene-ethylene copolymer (PP-R) and copolymer containing proprietary P-nucleating agent (PP-RCT). [Adapted, by permission from Papageorgiou, D G Papageorgiou, G Z Bikiaris, D N Chrissafis, K, Eur. Polym. J., 49, 1577-90, 2013.]...

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