Powder clearcoat and process for the production of a multicoat finish
AssigneeBASF Lacke + Farben, AG
InventorsJosef Rademacher, Udo Reiter
Life of this patent
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Abstract
The invention relates to a process for the production of a multicoat finish, in which a pigmented basecoat is applied, dried and coated over with a powder clearcoat, and subsequently basecoat and powder clearcoat are stoved together. The invention is characterized in that the powder clearcoat employed has a particle size distribution in which a) no more than 15% by weight of the powder clearcoat particles have a particle size smaller than 10 .mu.m; b) for at least 40% by weight of the powder clearcoat particles the common logarithm of the quotient of the largest and the smallest particle size is less than or equal to 0.25; and c) at least 98% by weight of the powder clearcoat particles have a particle size smaller than 100 .mu.m.
Claims8
Powder clearcoat, comprising powder clearcoat particles having a particle size distribution in which
- a) no more than 10% by weight of the powder clearcoat particles have a particle size smaller than 10 microns;
- b) for at least 50% by weight of the powder clearcoat particles the common logarithm of the quotient of the largest and the smallest particle size is less than or equal to 0.20;
- and
- c) at least 98% by weight of the powder clearcoat particles have a particle size smaller than 100 microns,
- and in which the average particle size of the powder clearcoat particles is d.+-.0.2 d, where d represents the average layer thickness of the stoved powder clearcoat layer to be prepared using the powder clearcoat, wherein the average particle size is determined using a laser diffraction spectrometer.
Dependencies are inferred from the claim text.