Radiation-curable polyurethane dispersion

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 175/16 (2006.01) C08G 18/08 (2006.01) C08G 18/12 (2006.01) C08G 18/66 (2006.01) C08G 18/67 (2006.01) C08G 18/76 (2006.01)

Patent

CA 2463971

The invention relates to new radiation-curable composition comprising an aqueous dispersion containing an unsaturated polyurethane with repeating units of tetramethylxylylene diisocyanate as the essential diisocyanate compound. The invention also relates to a process for making these dispersions in the absence of solvents. The product and process can meat severe environmental requirements in terms of absence of solvents, absence of amines and absence of irritating materials. The coatings obtained from the dispersions of the invention have all together a good resistance combined with a good cold flexibility. In particular, the coatings are glossy and exhibit a high adhesion, a good chemical resistance to stain, water and solvent and a good mechanical resistance to scratch and abrasion.

La présente invention concerne une nouvelle composition à séchage par rayonnement comprenant une dispersion aqueuse contenant un polyuréthane dont le composé diisocyanate essentiel est constitué d'unités de diisocyanate de tétraméthyl-xylylène se répétant. L'invention concerne également un procédé de production de ces dispersions en l'absence de solvants. Ce produit et ce procédé satisfont aux normes les plus sévères de protection de l'environnement quant à l'absence de solvants, d'amines ou de substances irritantes. Les revêtements obtenus avec ces dispersions de l'invention associent une bonne résistance à une bonne souplesse à froid. Plus particulièrement, ces revêtements sont brillants et font preuve d'une bonne adhésion, d'une bonne résistance chimique aux taches à l'eau et aux solvants, et d'une bonne résistance aux rayures et à l'abrasion.

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