Wacker-chemie Gmbh

Kunigunde Kolbig

Herbert Eck

Gerald Fleischmann

Alfred Prasse

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. The initiators used in the quasi-ionic polymerization are selected from group (I) consisting of cyclic silazanes, polymeric silazanes which contain more than two silazanyl groups per molecule, cyclic siloxanes and polymeric siloxanes which contain more than two siloxanyl groups per molecule and at least one Si-bonded hydrogen atom and silanes having at least one Si-bonded N atom in the form of secondary or tertiary amido groups or at least one Si-bonded carbon atom in the form of alkynyl or cyclodienyl groups for each Si atom, or group (II) consisting of silanes having at least three silyl groups per molecule, germanes, stannanes or siloxanes, germoxanes or stannoxanes, in which at least one metal-bonded hydrocarbyloxy group is present for each metal atom.

Process for polymerizing polar compounds

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.

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Gumpersdorf, Germany

Kunigunde Kolbig