Spherical polyester particles which can be crosslinked if...

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 63/78 (2006.01) C08G 63/81 (2006.01) C08J 3/12 (2006.01) C09D 5/03 (2006.01) C09D 167/02 (2006.01)

Patent

CA 2280789

The invention pertains to ball-shaped transparent polyester particles of an average size < 50 µm, having a monomodal granulometric distribution per article (d90-d10/d50) < 2,5. At temperatures < 200 ~C, these particles can be molten to form a continuous coating. The invention also relates to the process of production of same and their use as powder lacquers. In the preferred embodiment, the particles contain units of formulae (1): -CO-X-CO and (2): -O- D-O-, in which X represents a substituted or non-substituted aromatic C6 to C14 or an alkylene-polymethylene-cycloalkane-dimethylene-cycloalkane group or an alkandiyle group in a straight or branched chain, possibly unsaturated, and D represents an alkylene, polymethylene, cycloalkane, dimethylene-cycloalkane or an alkandiyle group in a straight or branched chain, possibly unsaturated.

L'invention concerne des particules de polyester transparentes de forme sphérique, de taille particulaire moyenne < 50 µm et présentant une composition granulométrique monomodale par particule (d90-d10/d50) < 2,5. A des températures < 200 ·C, ces particules peuvent être fondues pour former un revêtement continu. L'invention porte également sur leur mode de fabrication et leur utilisation en tant que laques en poudre. Dans la réalisation préférée, les particules contiennent des unités des formules (1): -CO-X-CO et (2): -O-D-O-, où X représente un résidu aromatique C¿6? à C¿14? substitué ou non substitué ou un groupe alkylène-polyméthylène-cycloalcane-diméthylène-cycloalcane ou un groupe alcandiyle en chaîne droite ou ramifiée, éventuellement insaturé, et D représente un groupe alkylène, polyméthylène, cycloalcane, diméthylène-cycloalcane ou un groupe alcandiyle en chaîne droite ou ramifiée, éventuellement insaturé.

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