Recording medium with glossy coating containing alumina

Details Recording medium with glossy coating containing alumina Recording medium with glossy coating containing alumina

D - Textiles, Paper

21

H

D21H 19/38 (2006.01) B41M 5/00 (2006.01) B41M 5/52 (2006.01) C09D 5/03 (2006.01)

Patent

CA 2385878

The present invention provides a recording medium comprising a substrate having a glossy coating thereon, wherein the glossy coating comprises a binder and alumina particles that are aggregates of primary particles. The present invention further provides a coating composition comprising the aforesaid alumina particles and a binder, wherein the solids content of the alumina in the coating composition is at least about 10 wt. %. The present invention also provides a method of preparing a coating composition, which method comprises providing a colloidally stable dispersion of the aforesaid alumina particles, wherein the solids content is greater than about 20 wt. %; adding a binder to and, optionally, diluting the dispersion; and, optionally, adjusting the pH with a suitable acid or base. The present invention further provides a method of preparing a recording medium, which method comprises providing a substrate, coating the substrate with the coating composition of the present invention, optionally calendering the coated substrate, and drying the coated substrate.

La présente invention concerne un support d'enregistrement comprenant un substrat recouvert d'un revêtement brillant, ce revêtement comprenant un liant et des particules d'alumine qui sont des agrégats de particules primaires. La présente invention traite également d'une composition de revêtement, comprenant lesdites particules d'alumine et un liant; la teneur en solides de l'alumine dans la composition de revêtement étant égale à au moins 10 % en poids. La présente invention traite aussi d'un procédé de préparation d'une composition de revêtement. Ce procédé consiste à fournir une dispersion colloïdalement stable des particules d'alumine susmentionnées, et la teneur en solides est supérieure à environ 20 % en poids, à ajouter un liant, et éventuellement, à diluer la dispersion, et ajuster le pH à l'aide d'un acide ou d'une base approprié. La présente invention a aussi pour objet un procédé de préparation d'un support d'enregistrement, lequel procédé consiste à fournir un substrat, à le recouvrir d'une composition de revêtement selon la présente invention, et éventuellement à laminer ce substrat recouvert, et enfin à le sécher.

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