ONE-COMPONENT POWDER COATING COMPOSITION AND SUBSTRATE COATED WITH SUCH POWDER COATING COMPOSITION

The invention relates to a one-component powder coating composition comprising a curing system comprising a curable resin and one or more curing additives for curing the curable resin, wherein the powder coating composition comprises: - one powder coating component comprising the curable resin and the one or more curing additives; - in the range of from 0.1 to 15.0 wt% of a first dry-blended inorganic particulate additive consisting of inorganic components i), ii), and iii), wherein component i) is non-coated aluminium oxide or non-coated silica, component ii) is aluminium hydroxide and/or aluminium oxyhydroxide, and component iii) is silica, and wherein, if component i) is non-coated silica, component iii) does not comprise non-coated silica; and - in the range of from 0.1 to 35 wt% of a second dry-blended inorganic particulate additive, wherein the powder coating composition comprises in the range of from 1.0 to 40 wt% of dry-blended inorganic particulate additive, wherein the wt% of dryblended inorganic particulate additive is based on the weight of the one powder coating component, and wherein the second dry-blended inorganic particulate additive is free of aluminium oxide, silica, aluminium hydroxide and aluminium oxyhydroxide, wherein the first dry-blended inorganic particulate additive comprises a first and a second silica wherein the first silica is a surface-treated silica with a negative tribocharge, and the second silica is non-coated silica or is a surface-treated silica with a positive tribocharge. The invention further relates to a substrate coated with such powder coating composition. L'invention concerne une composition de revêtement en poudre monoconstituant comprenant un système de durcissement comprenant une résine durcissable et un ou plusieurs additifs de durcissement servant à durcir la résine durcissable, la composition de revêtement en poudre comprenant : - un constituant de revêtement en poudre comprenant la résine durcissable et le ou les additifs de durcissement ; - dans la plage de 0,1 à 15,0 % en poids d'un premier additif particulaire inorganique mélangé à sec constitué des constituants inorganiques i), ii) et iii), le constituant i) étant de l'oxyde d'aluminium non revêtu ou de la silice non revêtue, le constituant ii) étant de l'hydroxyde d'aluminium et/ou de l'oxyhydroxyde d'aluminium, et le constituant iii) étant de la silice et, si le constituant i) est de la silice non revêtue, le constituant iii) ne comprenant pas de si