PVdF-based powder coatings
AssigneeLabofina, S.A.
InventorsWillem Sietses, Tjalling M. Plantenga, Jean-Paul Dekerk
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Abstract
A process for preparing pigmented PVdF-based powder coating products is disclosed, which comprises the steps of (i) mixing PVdF resin with a compatible thermoplastic resin, preferably PMMA in a weight ratio of about 80:20 to 40:60, with pigments, and with a small amount of flow promoter, (ii) pelletizing the mixture of (i), and (iii) cryogenically grinding the pellets and sieving the large particles. Also disclosed is a process for coating a substrate, comprising the steps of (a) applying the above prepared powder coating product on a substrate, and (b) subjecting to a heat treatment.
Claims18
A process for preparing pigmented PVdF-based powder coating products, comprising the steps of:
- (i) mixing PVdF resin with at least one compatible thermoplastic PMMA resin, a minor amount of a low molecular weight acrylic polymer as a flow improver, and a minor amount of at least one pigment, wherein the weight ratio of PVdF-PMMA is from about 80-20 to 40-60;
- (ii) pelletizing the resulting mixture of (i);
- (iii) grinding, at a temperature below about -50.degree. C., the resulting pellets of (ii) to form a particulate powder having an average particle size between about 0.03 and 0.05 mm.
Dependencies are inferred from the claim text.