Patent ID: 9528003
Filing Date: 2016-12-27
CPC Classification: C01P,C08K,C08L,C09C,Y10T

Claim Text:
1. A process for the preparation of a composition for beta-nucleation of polypropylene, comprising the following steps: (i) providing a particulate mineral solid support which comprises a compound of a IUPAC Group 2 metal, (ii) grinding the particulate mineral solid support in the presence of a dispersing and/or grinding agent so that the dispersing and/or grinding agent is adsorbed on its surface, and (iii) reacting the particulate mineral solid support, having a dispersing and/or grinding agent adsorbed on its surface, with a dicarboxylic acid having from 7 to 10 carbon atoms, wherein step (iii) is carried out during or after step (ii), so that a salt of the dicarboxylic acid forms on the surface of the particulate mineral solid support, wherein the compound of the IUPAC Group 2 metal is natural ground calcium carbonate, calcium-magnesium carbonate, or any mixture thereof; the natural calcium carbonate is marble, limestone, chalk or any mixture thereof; and the calcium-magnesium carbonate is dolomite, and wherein at least 80 mole % of the dicarboxylic acid is converted to the salt of the dicarboxylic acid.