Graft copolymer of polyamide and a glycidyl group-containing...

C - Chemistry – Metallurgy – 08 – L

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C08L 77/00 (2006.01) C08F 283/04 (2006.01) C08L 77/12 (2006.01)

Patent

CA 2382857

A graft copolymer comprising a polyamide to which is grafted a glycidyl group- containing acrylate copolymer. The graft copolymer can be prepared by dispersing in an organic solvent a polyamide and a material which will react with the polyamide to form the graft copolymer of the polyamide and the acrylate copolymer and reacting the polyamide and the material so as to form said graft copolymer. The graft copolymer can exhibit improved toughness and reduced friability and can be used to form molded articles and in coating compositions, especially powder coating compositions. The coatings can exhibit transparency, reduced brittleness and increased chip resistance. The powder coatings can further exhibit high gloss and smoothness due to superior flow characteristics thereby enabling thinner coatings to be used that provide acceptable appearance.

Cette invention concerne un copolymère greffé comprenant un polyamide sur lequel est greffé un groupe glycidyle renfermant un copolymère d'acrylate. Le copolymère greffé peut s'obtenir par dispersion dans un solvant organique d'un polyamide et d'un matériau qui réagit avec le polyamide pour former le copolymère greffé du polyamide et le copolymère d'acrylate, et par réaction du polyamide et du matériau qui forment ledit copolymère greffé. Ce copolymère greffé, qui se caractérise par une robustesse accrue et une moindre friabilité, convient pour la fabrication d'articles moulés et de compositions pour revêtements, en particulier en poudre. Ces revêtements sont transparents, peu cassants et ne s'ébrèchent pas. Les revêtements à base de poudre possèdent par ailleurs un brillant et un lissé élevés compte tenu de leurs caractéristiques d'écoulement supérieures, ce qui permet de réduire l'épaisseur des couches tout en conservant un aspect acceptable.

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