Radiation curable powder compositions

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 167/07 (2006.01) C09D 5/03 (2006.01) C09D 151/08 (2006.01) C09D 163/02 (2006.01)

Patent

CA 2399264

Powder compositions hardenable by radiation usable for preparing paints or varnishes, specific amorphous polyesters which are comprised within these powder compositions, the use of the paints or varnishes comprising the powder compositions for coating an article as well as articles coated with the hardened paints or varnishes are disclosed. The powder compositions of the invention are especially suited for coating over metal and heat-sensitive substrates and combine, upon melting at low temperatures and curing by radiation, a series of properties such as good flow and film hardness along with an outstanding solvent resistance.

L'invention concerne des compositions en poudre durcissables par rayonnement utilisées dans la préparation de peintures ou de vernis, des polyesters amorphes spécifiques contenus dans ces compositions en poudre, l'utilisation des peintures ou de vernis comprenant les compositions en poudre pour recouvrir un article, ainsi que des articles recouverts des peintures ou des vernis durcis. Les compositions en poudre de l'invention sont spécialement adaptées pour recouvrir des substrats métalliques et sensibles à la chaleur, et combinent, suite à leur fusion à basses températures et à leur durcissage par rayonnement, une série de propriétés telles qu'un écoulement et une dureté de feuil de qualité ainsi qu'une grande résistance aux solvants.

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