Polymer particles containing dye

• US 6,844,377 B1
• Filed: 09/29/1999
• Issued: 01/18/2005
• Est. Priority Date: 09/30/1998
• Status: Expired due to Fees

• Current Assignee: BASF AG (BASF SE)
• Original Assignee: BASF AG (BASF SE)
• Inventors: Schlösser, Ulrike, Auweter, Helmut, Heger, Robert, Bohn, Heribert, Siemensmeyer, Karl
• Primary Examiner(s): Wu, David W.
• Assistant Examiner(s): Lee, Rip A.
• Application Number:
  US09/787,413
• Time in Patent Office: 1,938 Days
• Field of Search: 430/137, 523/335, 523/339, 523/200, 523/202
• US Class Current: 523/223
• CPC Class Codes: C08K 5/0041 Optical brightening agents, organic pigments
• CPC Class Codes: C09B 67/0063 of organic pigments with only macromolecular substances
• CPC Class Codes: C09B 67/0097 Dye preparations of special physical nature; Tablets, films, extrusion, microcapsules, sheets, pads, bags with dyes
• CPC Class Codes: C09D 11/30 Inkjet printing inks
• CPC Class Codes: C09D 11/328 characterised by dyes

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.

Claims

1. 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.

2. A process as claimed in claim 1, wherein the precipitating of the polymer particles is effected in the presence of a protective colloid.

3. A process as claimed in claim 1, wherein the polymer contains, in each case based on the total weight of the polymer, from 30 to 100% by weight of at least one monomer a, from 0 to 60% by weight of at least one monomer b having polar groups and from 0 to 30% by weight of at least one further monomer c, different from monomer a, in polymerized form.

4. A process as claimed in claim 3, wherein the monomer a is selected from the group consisting of esters of α

,β

-ethylenically unsaturated C₃-C₈ monocarboxylic acids or C₄-C₈-dicarboxylic acids with C₁-C₁₂-alkanols, vinyl esters of C₁-C₁₂ monocarboxylic acids, aromatic vinyl compounds and C₂-C₆ olefins.

5. A process as claimed in claim 3, wherein the monomer b is selected from the group consisting of α

,β

-ethylenically unsaturated C₃-C₈-monocarboxylic acids, α

,β

-ethylenically unsaturated C₄-C₈-dicarboxylic acids with C₁-C₁₂-alkanols and anhydrides thereof, aromatic vinylcarboxylic acids, monoethylenically unsaturated sulfonic acids and phosphonic acids, esters of α

,β

-ethylenically unsaturated C₃-C₈-monocarboxylic acids with amino-C₂-C₈-alkanols, mono-C₁-C₄-alkylamino-C₂-C₈-alkanols or di-C₁-C₄-alkylamino-C₂-C₈-alkanols, N-vinyl lactams and esters of α

,β

ethylenically unsaturated C₃-C₈-monocarboxylic acids with C₂-C₈-hydroxyalcohols or the ethoxylated or propoxylated derivatives thereof.