Coating composition and printing medium

B - Operations – Transporting – 41 – M

Patent

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B41M 5/00 (2006.01) B41M 5/52 (2006.01) C09D 171/02 (2006.01)

Patent

CA 2291253

A printing medium comprising: (a) a substrate having at least one surface; and (b) a coating on the surface wherein the coating comprises: (1) binder comprising organic polymer, wherein polyethylene oxide) having a weight average molecular weight in the range of from 100,000 to 3,000,000 constitutes at least 20 percent by weight of the organic polymer of the binder and wherein the organic polymer of the binder constitutes from 20 to 80 percent by weight of the coating; and (2) finely divided substantially water-insoluble filler particles, of which at least 25 percent by weight are finely divided substantially water- insoluble nonfilm-forming thermoplastic organic polymer particles, wherein the filler particles have a maximum dimension of less than 500 nanometers, are distributed throughout the binder, and constitute from 20 to 80 percent by weight of the coating. An aqueous coating composition comprising the above binder and filler is also described.

L'invention porte sur un support d'impression comprenant: (a) un substrat pourvu d'au moins une surface; et (b) un revêtement appliqué sur cette surface et comprenant: (1) un liant renfermant un polymère organique et dans lequel un poly(éthylène oxyde) ayant un poids moléculaire moyen au poids compris entre 100 000 et 3 000 000 constitue au moins 20 % en poids du polymère organique du liant, le polymère organique du liant constituant de 20 à 80 % en poids du revêtement; et (2) des particules de charge finement divisées et pratiquement insolubles dans l'eau dont au moins 25 % en poids sont des particules de polymère organique thermoplastiques, non filmogènes, également finement divisées et pratiquement insolubles dans l'eau. Ces particules de charge ont une dimension maximale inférieure à 500 nanomètres, sont réparties dans la totalité du liant et constituent de 20 à 80 % en poids du revêtement. L'invention porte également sur une composition de revêtement aqueuse comprenant le liant précité et une charge.

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