Water-soluble polymers based on acrylic or methacrylic derivatives
OwnerThomas Gross, Siegfried Korte +2inventors
InventorsThomas Gross, Siegfried Korte, Rolf-Volker Meyer, Hans-Jorg Seiler
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Abstract
Water-soluble homo- and/or copolymers containing alkali metal and/or alkaline earth metal carboxylate groups and based on acrylic or methacrylic derivatives, and corresponding water-soluble homo- and/or copolymers containing carboxyl groups and homo- and/or copolymers containing ammonium carboxylate groups are provided, which homo- and/or copolymers possess excellent suitability for increasing the viscosity of aqueous systems, in particular of print pastes for textile treatment.
Claims37
Process for the preparation of water-soluble homo- and/or copolymers containing alkali metal and/or alkaline earth metal carboxylate groups and based on acrylic or methacrylic derivatives, which is characterized in that
- a) acrylonitrile and/or methacrylonitrile is polymerized using persulphate/SO2 as a redox initiator in an aqueous medium and
- b) the resulting aqueous emulsion of the homo- and/or copolymers of acrylonitrile and/or of methacrylonitrile is hydrolysed with alkali metal and/or alkaline earth metal hydroxides,
- and the water-soluble homo- and/or copolymers obtained after step b) have 19 20-70 mol % of alkali metal and/or alkaline earth metal carboxylate groups, 20-70 mol % of carboxamido groups and 0-20 mol % of residual nitrile groups,
- the mol % data being based on the sum of all nitrile groups which are contained in the homo- and/or copolymers of acrylonitrile and/or of methacrylonitrile before the hydrolysis according to step b).
Process for the preparation of water-soluble homo- and/or copolymers containing carboxyl groups and based on acrylic or methacrylic derivatives, which is characterized in that
- a) acrylonitrile and/or methacrylonitrile is polymerized using persulphate/SO2 as a redox initiator in an aqueous medium,
- b) the resulting aqueous emulsion of the homo- and/or copolymers of acrylonitrile and/or of methacrylonitrile is hydrolysed with alkali metal and/or alkaline earth metal hydroxides and
- c) the resulting water-soluble homo- and/or copolymers containing alkali metal and/or alkaline earth metal carboxylate groups and based on acrylic or methacrylic derivatives are reacted with acids,
- the water-soluble homo- and/or copolymers obtained after step c) having 21 20-70 mol % of carboxyl groups, 20-70 mol % of carboxamido groups and 0-20 mol % of residual nitrile groups
- the mol % data being based on the sum of all nitrile groups which are contained in the homo- and copolymers of acrylonitrile and/or of methacrylonitrile before the hydrolysis according to step b) and
- the carboxyl groups having only an alkali metal and/or alkaline earth metal content of <5 mol %, based on the total number of all carboxyl groups.
Dependencies are inferred from the claim text.