Powder paints, method for production and use thereof

• US 7,449,516 B2
• Filed: 05/24/2002
• Issued: 11/11/2008
• Est. Priority Date: 06/01/2001
• Status: Expired due to Fees

• Current Assignee: BASF Coatings AG (BASF SE)
• Original Assignee: BASF Coatings AG (BASF SE)
• Inventors: Bayer, Robert, Wolf, Heiko, Stang, Michael, Jung, Werner-Alfons, Mauss, Michael, Berg, Jan, Polke, Reinhard, Weintz, Hans-Joachim
• Primary Examiner(s): Cain; Edward J
• Application Number:
  US10/476,092
• Publication Number:
  US 20040082715A1
• Time in Patent Office: 2,363 Days
• Field of Search: 523/333, 523/334, 523/351, 523/353, 524/800
• US Class Current: 524/800
• CPC Class Codes: C08J 3/16 by coagulating dispersions C08J3/122 takes precedence
• CPC Class Codes: C09D 5/03 Powdery paints

Abstract

Powder coating materials preparable by

• • (1) mixing at least two liquid components comprising in each case at least one liquid starting product in a static mixer, to give a molecularly disperse and/or finely dispersed liquid mixture,
  • (2) emulsifying the liquid mixture (1) in an aqueous medium in a dispersing unit, to give an aqueous emulsion of liquid particles,
  • (3) cooling the emulsion (2) so that a suspension of dimensionally stable particles is formed,
  • (4) isolating the dimensionally stable particles from the suspension (3)
    or alternatively
  • (3) isolating the dimensionally stable particles directly from the emulsion (2);
    and also processes for preparing them and their use as coating materials, adhesives, and sealing compounds or to prepare such compositions.

Claims

1. A process for preparing a powder coating material comprising

(1) mixing at least two liquid components in a static mixer to give a molecularly disperse and/or finely dispersed liquid mixture,

(2) emulsifying the liquid mixture in an aqueous medium in a dispersing unit to give an aqueous emulsion of liquid particles, and

(3) one of

(i) cooling the emulsion so that a suspension of dimensionally stable particles is formed, and isolating the dimensionally stable particles from the suspension,

or

(ii) isolating dimensionally stable particles directly from the emulsion.

2. The process as claimed in claim 1, wherein the aqueous medium at least partially comprises an aqueous pigment preparation.

3. The process of claim 1 further comprising applying the powder coating material to one of a motor vehicle body, a motor vehicle part, a door, a window, furniture, a part, a coil, a container, a packaging, an electrical component, and a white good.

4. The process of claim 1, wherein the residence time of the liquid components in the static mixer is from 0.5 to 20 seconds.

5. The process of claim 1, wherein the dispersing unit comprises an inline dissolver.

6. The process of claim 5, wherein the inline dissolver comprises a toothed-ring dispersing unit comprising at least one cylindrical arrangement of at least two comminutor rings (stator and rotor) that are seated on holders, are in mutual embrace, and are rotatable in opposite directions relative to one another, the working gap produced by the relative movement between stator and rotor having walls that extend nonparallelwise with respect to one another.

7. The process of claim 1, wherein the residence time of the liquid mixture and the aqueous medium in the dispersing unit is from 0.5 to 20 seconds.

8. The process of claim 1, wherein the dimensionally stable particles are isolated from the suspension by spray drying or freeze drying.

9. The process of claim 1, wherein the dimensionally stable particles are isolated from the emulsion by pressure relief.