In Part 1 of this publication ( [1] KGK 3/2021) it was reported about different tackifier classes with regard to their performance to create tackiness in highly filled silica hard-rubber compounds for processing. In addition to influence the rheological properties of compounds, the migration- and blooming tendency during storage time is of high importance. Part 2 deals with the tack behavior in dependency of time, which is investigated and correlated with the chemical compatibility of different mixing ingredients in the compound. To estimate the tackifier so lubility in the used NBR the concept of Hansen Solubility Parameters was em ployed and compared with experimental results.
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