Process for producing a powder coating material; a powder coating material; and the use of effect pigments
AssigneeMerck Patent GmbH
InventorTobias Witt
Life of this patent
Estimating the term…
Abstract
Described is a process for preparing a powder coating material, in which a mixture comprising binders, pigments and also, where appropriate, fillers, additives and cross linkers is extruded and then ground. The pigment fraction of this mixture at least in part comprises surface-modified effect pigment that has been coated with a low molecular mass polyethylene or polypropylene. Also, described is a powder coating material prepared by this process and the use of effect pigments coated with low molecular mass polyethylene or polypropylene to prepare powder coating materials.
Claims16
A process for preparing a powder coating material, which comprises:
- processing as a melt in an extruder, at least one binder and at least one pigment and optionally, also at least one filler, additive and/or cross linker, optionally following premixing, to give a homogeneous mixture and
- grinding the extrudate, after cooling, to a finished powder coating material,
- wherein at least part of the pigment comprises a platelet-shaped, surface-modified effect pigment that has been coated with a low molecular mass polyethylene or polypropylene.
A powder coating material comprising an extruded mixture, which has been ground following extrusion, of at least one binder and at least one pigment and also, optionally, at least one filler, additive and/or cross linker, wherein at least part of the pigment comprises surface-modified effect pigment that has been coated with a low molecular mass polyethylene or polypropylene.
Dependencies are inferred from the claim text.