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US 6,844,377 B1Granted
Polymer particles containing dye
AssigneeBASF SE
InventorsHelmut Auweter, Heribert Bohn, Robert Heger, Ulrike Schlösser, Karl Siemensmeyer
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Abstract
Dye-containing polymer particles of at least one dye in a matrix of an essentially water-insoluble polymer and having an average particle size within the range from 5 nm to 5 μm are prepared by a process which comprises precipitating the dye-containing polymer particles from a solution of the polymer and of the dye in a water-miscible organic solvent by addition of an aqueous phase thereto.
Claims5
A process for preparing dye-containing particles, comprising:
- preparing a solution of at least one dye and a water-insoluble polymer dissolved in a water-miscible organic solvent;
- and
- continuously comixing in a static mixing nozzle the dye/polymer solution with an aqueous phase at relative rates sufficient to precipitate dye-containing polymer particles ranging in size ranging from 5 nm to 500 nm and having a particle size distribution width of ≦40% of the at least one dye in a polymer matrix.
Dependencies are inferred from the claim text.