Stain inhibiting pigment composition

C - Chemistry – Metallurgy – 09 – D

Patent

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C09D 5/16 (2006.01) B05D 1/18 (2006.01) B05D 3/02 (2006.01) B05D 7/06 (2006.01) B32B 21/04 (2006.01) C09D 5/14 (2006.01) C09D 5/18 (2006.01)

Patent

CA 2276615

A process of treating wood to reduce the tannin staining of coatings subsequently applied includes the steps of providing a solution of a zirconyl compound in a carrier liquid such as water, applying the solution to a wood surface, and drying the solution. The pore structure of the wood is modified or sealed so that staining of coating compositions applied subsequently over the surface is reduced. The process is particularly beneficial in cases where the coating composition is a clear or a light-colored latex paint, especially white. The preferred zirconyl compound is zirconyl acetate. The treating solution may be modified by addition thereto of a lanthanide compound, especially cerium, to provide UV light protection to a substrate and further by one or more metal cations to impart mildewicidal activity to the composition.

L'invention porte sur un procédé de traitement du bois visant à éliminer la coloration par le tanin des revêtements ultérieurement appliqués. Ce procédé consiste à produire une solution d'un composé zirconyle introduit dans un liquide porteur tel que l'eau, appliquer cette solution sur une surface en bois et sécher cette solution. La structure poreuse du bois est modifiée ou étanchéifiée de manière à éliminer la coloration des compositions de revêtement appliquées ultérieurement sur la surface. Ce procédé est notamment avantageux dans les cas où la composition de revêtement est une peinture au latex claire ou légèrement teintée, notamment blanche. Le composé zirconyle préféré est l'acétate de zirconyle. Il est possible de modifier la solution de traitement en y ajoutant un composé lanthanide, notamment le cérium, de façon à protéger un substrat de la lumière ultraviolette, et en y ajoutant également un ou plusieurs cations métalliques conférant à la composition une activité anticryptogamique.

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