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US 7,405,263 B2Granted
Polymer for water treatment
AssigneeBASF SE
InventorsPia Baum, Erich Lutz, Marcus Guzmann, Karl-Heinz Buechner, Gregor Brodt
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Abstract
A description is given of (meth)acrylic acid copolymers comprising methacrylic acid units and units based on isopropanol, the polymer being functionalized with aminoalkylsulfonic acid. In addition, a description is given of a process for the preparation thereof and the use thereof for watertreatment, scale inhibition in mineral oil extraction and corrosion inhibition in aqueous systems.
Claims4
A process for preparing (meth)acrylic acid copolymers, which comprises the following process steps:
- (1) free-radical polymerization of(meth)acrylic acid in the presence of isopropanol with or without water, with a polymer I resulting, and
- (2) amidating the polymer I originating from process step (1) by reaction with at least one aminoalkanesulfonic acid,
- wherein the (meth)acrylic acid copolymers comprise
- (a) from 50 to 75% by weight of a poly(meth)acrylic acid basic structure,
- (b) from 5 to 20% by weight of at least one unit which is bound to the basic structure and is selected from the group consisting of isobutene units, terelactone units and isopropanol units, and
- (c) from 5 to 40% by weight of amide units based on aminoalkyl-sulfonic acids, the total weight of the units in the (meth)acrylic acid copolymer being 100% by weight and all weights being based on the (meth)acrylic acid copolymer.
3 more elements
Dependencies are inferred from the claim text.