Production of dispersants by nitroxide-mediated solution polymerization
AssigneeSika Technology AG
InventorsJürg Weidmann, Fabia Ulber, Jörg Zimmermann
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Abstract
The present invention relates to processes for preparing a copolymer, especially a dispersant for solid particles, in particular a dispersant for mineral binder compositions, wherein ionizable monomers m1 and side chain-bearing monomers m2 are polymerized by nitroxide-mediated solution polymerization to give a copolymer, wherein the polymerization is conducted in the presence of an agent comprising a carboxyl group-bearing and phosphated alkoxy amine.
Claims14
A process for preparing a copolymer, comprising polymerizing ionizable monomers m1 and side chain-bearing monomers m2 by nitroxide-mediated solution polymerization to give the copolymer, wherein the polymerization is conducted in the presence of an agent comprising a carboxyl-bearing phosphated alkoxy amine;
- wherein
- the nitroxide-mediated solution polymerization is conducted at a pH in the range of 7.5-13, and
- the monomers are converted to a copolymer having block structure, wherein the side chain-bearing monomers m2 are present in at least one first block A and ionizable monomers m1 are present in at least one second block B any proportion of monomers m1 present in the first block A is less than 15 mol % based on all the monomers m2 in the first block A, and any proportion of monomers m2 present in the second block B is less than 15 mol % based on all the monomers m1 in the second block B.
Dependencies are inferred from the claim text.