Process for polymerizing polar compounds

US5210162A · kind A · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Herbert Eck · Burghausen, DE
• Gerald Fleischmann · Emmerting, DE
• Kunigunde Kolbig · Simbach, DE
• Alfred Prasse · Burghausen, DE

Key dates

• Filing date: Dec 23, 1991
• Grant date: May 11, 1993
• Expiry date: Dec 23, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F4/42
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

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. 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 at…