International Coatings Limited

John Ring

Kevin Jeffrey Kittle

Gareth Dale Crapper

Gianfranco Arpe

Powder coating compositions incorporate, by dry blending, a wax-coated silica additive in finely divided form. Further additives that may be incorporated by dry blending include aluminum oxide and/or aluminum hydroxide. The compositions offer advantages, for example, in terms of fluidity and in terms of first-time deposition of fine particles.

Powder coating compositions

A powder coating composition of the invention comprises a film-forming polymeric component having a d(v, ) in the range or from 25 to 50 microns or a d(v, ) in the range of from 25 to 70 microns, which composition incorporates by dry-blending at least one appearance-modifying additive component and a further component comprising wax-coated silica or consisting of alumina together with aluminum hydroxide. The appearance-modifying additive may be a gloss-reducing component, a texturing component, a metallic or mica component, a coloring pigment, or a further film-forming polymeric material comparable with the first film-forming polymeric material and differing in coloration therefrom, and the further additive may be alumina together with aluminum hydroxide, wax-coated silica, or a combination thereof. Preferably, no more than 70% by volume of the particles in the film-forming polymeric material are less than 50 microns. A kit of the invention comprises the individual additive components prior to mixing. The kit allows for the flexible production of a variety of finishes from a gloss powder coating composition, for example, a matte, textured, metallic, or sparkle finish, a matte metallic finish, an antique finish, or a contrast texture or metallic sparkle finish.

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Newcastle-upon-Tyne, United Kingdom

John Ring