High molecular weight anionic polyacrylamides
AssigneeSnf Group
InventorsCédrick Favero, Johann Kieffer, Nicolas Boisse, Jing Ling
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Abstract
This invention relates to a polymer composition comprising a water-soluble anionic P2 polymer obtained by radical polymerization of at least one anionic monomer, in the presence of a water-soluble homopolymer P1 with a weight-average molecular weight of between 5,000 and 100,000 daltons said water-soluble anionic P2 polymer having a weight-average molecular weight of greater than 100,000 dalton and less than or equal to 40 million daltons, said water-soluble P1 homopolymer having been prepared from 2-acrylamido-2-methylpropanesulphonic acid in salified form and in the presence of 200 to 20,000 ppm by weight of 2-methyl-2-propenylsulphonic acid in salified form.
Claims18
A polymeric composition comprising a water-soluble anionic P2 polymer obtained by radical polymerization of at least one anionic monomer, in the presence of a water-soluble P1 homopolymer with an average molecular weight by weight of between 5,000 and 100,000 daltons,
- wherein said water-soluble anionic P2 polymer has a weight-average molecular weight greater than 100,000 daltons and less than or equal to 40 million daltons, and said water-soluble P1 homopolymer is prepared from 2-acrylamido-2-methylpropane sulfonic acid in salified form and in the presence of 200 to 20,000 ppm by weight of 2-methyl-2-propenyl-sulfonic acid in salified form.
Dependencies are inferred from the claim text.