METHOD FOR PRODUCING POLYMER NANOPARTICLES

• US 20090053272A1
• Filed: 03/13/2007
• Published: 02/26/2009
• Est. Priority Date: 03/13/2006
• Status: Abandoned Application

• Current Assignee: BASF SE
• Original Assignee: BASF SE
• Inventors: Wagenblast, Gerhard
• Application Number:
  US12/282,897
• Publication Number:
  US 20090053272A1
• Time in Patent Office: Days
• US Class Current: 424/401
• CPC Class Codes: C08F 2/18 Suspension polymerisation
• CPC Class Codes: C08F 2/44 Polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers
• CPC Class Codes: C08F 2/48 by ultraviolet or visible light
• CPC Class Codes: C08K 5/0008 Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59

Abstract

A process for the preparation of polymeric nanoparticles, in which an emulsion of monomers and additional components is produced in a nonsolvent and subsequently illuminated, makes it possible to prepare polymeric nanoparticles which comprise, in a desired concentration, an effect substance, for example a dye, and/or an active substance, for example a herbicide.

Claims

1-18. -18. (canceled)

19. A process for the preparation of polymeric nanoparticles which comprises introducing one or more polymerizable monomers (M) and one or more dispersants (D) and/or one or more effect substances (E) and/or one or more active substances (A) into a nonsolvent (N) to form an emulsion and illuminating said emulsion with a suitable light source (L), resulting in a photopolymerization of the monomers (M).

20. The process according to claim 19, wherein at least two different monomers (M) are used.

21. The process according to claim 19, wherein the polymerizable monomers (M) are first mixed with a photoinitiator (P) and optionally one or more effect substances (E) and/or one or more active substances (A), an emulsion is subsequently produced from this mixture, together with the nonsolvent (N) and the dispersant (D), and the emulsion thus formed, optionally after producing a fine emulsion produced by introducing shear energy, is subjected to an illuminating stage with UV light.

22. The process according to claim 19, wherein said monomer is a polymerizable acrylate monomer.

23. The process according to claim 19, wherein the comprises introducing one or more polymerizable monomers (M) and one or more dispersants (D) and one or more effect substances (E) into a nonsolvent (N) to form an emulsion and illuminating said emulsion with a suitable light source (L), resulting in a photopolymerization of the monomers (M).

24. The process according to claim 19, wherein the comprises introducing one or more polymerizable monomers (M) and one or more dispersants (D) and one or more active substances (A) into a nonsolvent (N) to form an emulsion and illuminating said emulsion with a suitable light source (L), resulting in a photopolymerization of the monomers (M).

25. The process according to claim 22, which further comprises an effect substance (E) and/or an active substance (A), of one or more photoinitiators (F).

26. The process according to claim 19, wherein use is made of an emulsion which additionally comprises one or more effect substances (E) selected from the group consisting of dyes, optical brighteners, UV absorbers and pigments and/or one or more active substances (A) selected from the group consisting of pesticides, biocides, pharmaceuticals and fragrances.

27. The process according to claim 19, wherein a preemulsion is first produced by stirring and this is then treated by a process for fine emulsification with the introduction of shear energy and subsequently illuminated with a suitable light source and photopolymerized.

28. The process according to claim 19, wherein a preemulsion is first produced and this is then treated by a continuous process for fine emulsification with introduction of shear energy, the emulsified particles comprising the monomers achieving a mean size of less than 4 μ

m, and subsequently illuminated with a UV light source and photopolymerized.

29. The process according to claim 19, which is carried out at a temperature of 10 to 50°

C.

30. The process according to claim 19 wherein a preemulsion is first produced and this is then converted to a fine emulsion using a rotor/stator process or using a high-pressure homogenization process and the fine emulsion is illuminated with a UV light source and photopolymerized.

31. Polymeric nanoparticles which are prepared by the process of claim 19.

32. The polymeric nanoparticles according to claim 31, which comprise one or more effect substances (E) and/or one or more active substances (A).

33. The polymeric nanoparticles according to claim 31, which exhibit a mean particle size of less than 4 μ

m.

34. The polymeric nanoparticles according to claim 31, which comprise at least one polyacrylate and which exhibit a mean particle size of 0.05 μ

m to 3.0 μ

m.

35. The polymeric nanoparticles according to claim 31, which comprise at least one effect substance (E) selected from the group consisting of dyes, optical brighteners, UV absorbers and pigments.

36. The polymeric nanoparticles according to claim 31, which comprise at least one active substance (A) selected from the group consisting of pesticides, biocides, pharmaceuticals and fragrances.

37. The polymeric nanoparticles according to claim 31, which comprise at least one active substance (A) selected from the group consisting of pesticides, biocides, pharmaceuticals and fragrances and in addition at least one effect substance (E) selected from the group consisting of dyes, optical brighteners, UV absorbers and pigments.