Dispersing assistant for emulsion and suspension polymerization
AssigneeBASF SE
InventorsOihana Elizalde, Kathrin Michl, Rajan Venkatesh
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Abstract
The use of an addition polymer A composed in copolymerized form of 0.1% to 40% by weight of at least one C3 to C30 alkene, 40% to 99.9% by weight of at least one ethylenically unsaturated C3 to C6 monocarboxylic acid, 0% to 50% by weight of at least one ethylenically unsaturated C4 to C12 dicarboxylic acid and/or of the ethylenically unsaturated dicarboxylic monoalkyl esters or dicarboxylic anhydrides obtainable from said acid, and 0% to 30% by weight of at least one other ethylenically unsaturated compound which is copolymerizable with the aforementioned monomers, as a dispersing assistant in free-radically initiated aqueous emulsion or suspension polymerization.
Claims18
A method comprising conducting free-radically initiated aqueous emulsion polymerization or suspension polymerization in the presence of a dispersing assistant, wherein the dispersing assistant is an addition polymer A comprising in copolymerized form:
- 0.1% to 40% by weight of at least one C3 to C30 alkene (monomer A1),
- 40% to 99.9% by weight of at least one ethylenically unsaturated C3 to C6 monocarboxylic acid (monomer A2),
- 0% to 50% by weight of at least one ethylenically unsaturated C4 to C12 dicarboxylic acid and/or of the ethylenically unsaturated dicarboxylic monoalkyl esters or dicarboxylic anhydrides obtainable from said acid (monomer A3), and
- 0% to 30% by weight of at least one other ethylenically unsaturated compound which is copolymerizable with the monomers A1 to A3 (monomer A4),
- the amounts of monomers A1 to A4 adding up to 100% by weight.
Dependencies are inferred from the claim text.