Evonik Rohm Gmbh

Pamela Boehmann

Christian Meier

Johannes Vorholz

Andreas Weber

Marcus Denger

Norbert Hoffmann

Nikolaos Papadopoulos

Alpertunga Kueksal

Andreas Klosendorf

The invention relates to a process for preparing a (meth)acrylate copolymer containing tertiary amino groups by free-radical polymerization in solution from a monomer mixture selected from a) 30 to 70% by weight of a C-C-alkyl ester of acrylic acid or methacrylic acid and b) 70 to 30% by weight of an alkyl ester of acrylic acid or methacrylic acid with a tertiary amino group in the alkyl radical and c) 0 to 10% of further copolymerizable vinyl monomers, whereby one or more polymerization initiators, optionally one or more molecular weight regulators and one or more solvents or of a solvent mixture are added to the monomer mixture to give a polymerization mixture, which is polymerized at temperatures from 30 to 120&#xb0; C. over a period of 2 to 24 hours, where the polymerization mixture is finally polymerized to give a polymerization syrup with a conversion of the monomers to the copolymer of at least 99% by weight, where the polymerization syrup is subsequently degassed by distillation or by extrusion and the degassed polymerization syrup is further comminuted to a copolymer preparation in the form of a granulate or powder, where the copolymer preparation is characterized by a molecular weight (M) of 25.000 to 75.000 g/mol a polydispersity index of 2.1 to 2.9 and a residual solvent concentration of less than 1.000 ppm by weight.

Process for preparing a (meth)acrylate copolymer containing tertiary amino groups by free-radical polymerization in solution

The invention relates to a process for preparing a (meth)acrylate copolymer containing quaternary ammonium groups from a monomer mixture selected from: (a) 80 to 99% by weight of a C1-C4-alkyl ester of acrylic acid or methacrylic acid; and (b) 20 to 1% by weight of an alkyl ester of acrylic acid or methacrylic acid with a quaternary ammonium group in the alkyl radical; and (c) 0 to 10% of further copolymerizable vinyl monomers whereby one or more polymerization initiators, optionally one or more molecular weight regulators and one or more solvents or of a solvent mixture are added to the monomer mixture to give a polymerization mixture, which is polymerized at temperatures from 30 to 120 C over a period of 2 to 24 hours, where the polymerization mixture is polymerized to a polymerization syrup with a conversion of the monomers to the copolymer of at least 99% by weight, where the polymerization syrup is subsequently degassed by distillation or by extrusion and the degassed polymerization syrup is further comminuted to a copolymer preparation in the form of a granulate or powder and where the copolymer preparation is characterized by a molecular weight (Mw) of 25.000 to 50.000, a polydispersity index of 2.0 to 3.0 and a residual solvent concentration of less than 10.000 ppm by weight.

Process for preparing a (meth)acrylate copolymer containing quaternary ammonium groups by free-radical polymerization in solution

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Weiterstadt, Germany

Pamela Boehmann