Composition and method for improved ink jet printing...

B - Operations – Transporting – 41 – M

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B41M 5/00 (2006.01) B41M 5/52 (2006.01) D21H 17/17 (2006.01) D21H 17/28 (2006.01) D21H 17/33 (2006.01) D21H 17/63 (2006.01) D21H 21/16 (2006.01) D21H 17/66 (2006.01)

Patent

CA 2297792

This invention relates to a composition useful for surface treating a sheet substrate for ink jet printing, the composition comprising a salt of a divalent metal, the salt being soluble in an aqueous sizing medium at about pH 7 to about pH 9, the aqueous sizing medium further comprising a carrier agent and a sizing agent. It also includes a method of making an ink jet printing substrate capable of retaining indicia formed by ink jet printing using pigmented ink, the method comprising surface treating the substrate with an aqueous sizing medium containing a divalent metal salt. A method for improving print quality of ink jet printing of pigmented ink on a surface treated substrate made using the composition or method is also disclosed, as is the paper so made, with and without ink jet printed pigmented ink applied thereto. Indicia printed thereon will have improved print quality characteristics.

L'invention concerne une composition utilisée pour le traitement de surface d'une feuille de substrat en vue d'une impression par jet d'encre. Cette composition comprend un sel d'un métal bivalent, sel qui est soluble dans un milieu de collage aqueux de pH compris entre 7 environ et 9 environ, et milieu de collage aqueux qui renferme en outre un agent porteur et un agent de collage. L'invention concerne également un procédé de fabrication d'un substrat pour impression par jet d'encre capable de garder des marques formées par l'impression par jet d'encre en utilisant de l'encre pigmentaire. Ledit procédé consiste à effectuer un traitement de surface sur le substrat avec un milieu de collage aqueux renfermant un sel métallique bivalent. L'invention a en outre pour objet un procédé permettant d'améliorer la qualité d'impression par jet d'encre pigmentaire sur un substrat à surface traitée obtenu avec la composition et au procédé de l'invention, ainsi que le papier ainsi fabriqué, avec ou sans impression par jet d'encre à l'encre pigmentaire. Les marques imprimées sur ce papier présentent des caractéristiques de qualité d'impression améliorées.

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