Powder coating extrusion process using liquid
AssigneeAkzo Nobel Coatings International B.V.
InventorsAndrew Robert Morgan, Stephen Raymond Wilburn, Edward Clark
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Abstract
A process for the manufacture of a powder coating comprising the steps of: Preparing a powder coating premix comprising a resin and optionally a crosslinker therefor; Feeding the premix through a melt extruder; Cooling the extruded material; and Comminuting it to fine particles, wherein said process is characterized in that between 1 and 25 wt. % (based on the weight of said premix) of a process liquid is added to the melt extruder, wherein said process liquid is immiscible with at least said resin of the powder coating premix and wherein said process liquid evaporates when the premix leaves the extruder.
Claims15
A process for the manufacture of a powder coating comprising the steps of:
- Preparing a powder coating premix comprising a resin and optionally a crosslinker for said resin;
- Feeding the premix through a melt extruder;
- Cooling the extruded material;
- and
- Comminuting it to fine particles,
- wherein between 1 and 25 wt. %, by weight of the premix, of a process liquid is added to the melt extruder, wherein said process liquid is immiscible with at least said resin of the powder coating premix and wherein said process liquid evaporates when the premix leaves the extruder.
A process for the manufacture of a powder coating comprising the steps of:
- Preparing a powder coating premix comprising a resin and a crosslinker for said resin;
- Feeding the premix through a melt extruder maintained at a temperature in the range from 100° to 200° C. and a pressure in the range from 1 to 16 bar;
- Cooling the extruded material;
- and
- Comminuting it to fine particles,
- wherein between 1 and 15 wt. %, by weight of the premix, of demineralised water is added to the melt extruder, wherein said demineralised water is immiscible with at least said resin of the powder coating premix and wherein said demineralised water evaporates when the premix leaves the extruder.
Dependencies are inferred from the claim text.