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US 2011/0217255 A1Published application
Block copolymers and their use
AssigneeBASF SE
InventorsSON NGUYEN KIM, Wolfgang Jahnel
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Abstract
The present invention relates to a process for the preparation of a crosslinked copolymer with anionogenic/anionic groups by free-radical copolymerization by the method of precipitation polymerization, to the copolymers obtained by this process and to their use.
Claims35
-34. (canceled)
A process for the preparation of a copolymer composition CP) by free-radical copolymerization of a monomer composition comprising
- a) 70 to 100% by weight, based on the total weight of the monomers used for the polymerization, of acrylic acid,
- b) 0 to 30% by weight, based on the total weight of the monomers used for the polymerization, of at least one hydrophilic nonionic compound, different from a), having a free-radically polymerizable, α,β-ethylenically unsaturated double bond,
- c) 0 to 1% by weight, based on the total weight of the monomers used for the polymerization, of at least one free-radically polymerizable crosslinking compound which comprises at least two α,β-ethylenically unsaturated double bonds per molecule,
- by the method of precipitation polymerization in the presence of an auxiliary composition H) comprising
- H1) at least one compound with a block structure which comprises at least one hydrophobic group and at least one hydrophilic group, and
- H2) at least one basic compound different from H1).
3 more elements
Dependencies are inferred from the claim text.