Coating composition comprising colloidal silica and glossy...

B - Operations – Transporting – 41 – M

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B41M 5/00 (2006.01) B41M 5/52 (2006.01) C09D 7/12 (2006.01)

Patent

CA 2479692

A coating composition comprising low sodium containing colloidal silicas and ink jet recording sheets prepared from such coatings are described. The coating comprises binder and colloidal silica preferably having an average particle size in the range of about 1 to 300 nanometers and which has a solids to alkali metal ratio of at least the sum of AW(-0.013SSA+9), AW being the atomic weight of alkali metal present in the colloidal silica and SSA being the specific surface area of the silica. It has been discovered that if the alkali metal, e.g., sodium, content of colloidal silica is reduced, coatings prepared from such colloidal silica and applied to conventional ink jet recording sheet supports provide a specular gloss of at least 30 at 60 ~C., even at a relatively high silica solids to binder solids ratio of 1:1 or greater.

L'invention concerne une composition de revêtement pauvre en sodium contenant des silices colloïdales ainsi que des feuilles d'enregistrement à jet d'encre préparées à partir de ces revêtements. Ledit revêtement comprend un liant et de la silice colloïdale ayant de préférence une dimension granulométrique moyenne se situant entre environ 1 et environ 300 nanomètres et un rapport entre solides et métal alcalin d'au moins la somme de AW(-0,013SSA+9), AW étant la masse atomique du métal alcalin présent dans la silice colloïdale et SSA l'aire spécifique de la silice. Selon l'invention, si la teneur en métal alcalin, par exemple le sodium, de la silice colloïdale est réduite, les revêtements préparés à partir de ladite silice colloïdale et appliqués à des supports de feuilles d'enregistrement à jet d'encre classique présentent un brillant spéculaire d'au moins 30 à 60 ·C, même à un rapport entre solides de silice et solides du liant relativement élevé de 1:1 ou plus.

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