Abstract: A process for polymerizing polar compounds which have a C.dbd.C double bond in an .alpha.-position relative to a carbonyl or nitrile group, such as acrylic acid derivatives, which comprises polymerizing the polar compounds in the presence of organometallic compounds of silicon, germanium or tin as initiators together with a nucleophilic or electrophilic catalyst at temperatures in the range of from -100.degree. C. to +100.degree. C.

Abstract: A process for improving the adhesion of polymeric substances containing organic groups or composed of such groups to the surfaces of alkaline earth metal carbonates, which comprises applying an organic aprotic solvent solution containing at least one organosilicon compound having fluorine bonded directly to silicon and an average of not more than 1.8 SiC-bonded organic radicals per silicon atom to the surface of alkaline earth metal carbonates and removing the solvent before a polymeric substance containing organic groups is applied to the pretreated alkaline earth metal carbonate surface.