Multi-layered coatings and coated paper and paperboards
AssigneeCabot Corporation
InventorSanjay Behl
Life of this patent
Estimating the term…
Abstract
A multi-layered coating for use preferably on paperboard or paper is disclosed wherein the coating contains at least two layers. The first layer contains at least one dark colorant, at least one white or near white pigment, and at least one binder, and the second layer contains at least one pigment other than a dark colorant, such as a white or near white pigment, and at least one binder. Slurries and dry mixtures containing these ingredients are also disclosed. A multi-layered coated paperboard or paper comprising paperboard or paper and the multi-layered coating is also disclosed. A method to reduce the amount of a white or near white pigment like titania is also disclosed which involves using one or more of the above-described multi-layered coatings on paperboard or paper.
Claims39
A method of increasing the brightness of a multi-layered coating comprising at least a first layer and a second layer, wherein said first layer comprises b) at least one white pigment, and c) at least one binder, and wherein said second layer comprises a) at least one white pigment and b) at least one binder, wherein said method comprises including in said first layer a) a dark colorant, that increases the brightness of the multi-layered coating, in an amount sufficient to reduce mottle on a substrate while increasing brightness compared to the mottle and brightness of the same substrate coated with the same multi-layered coating but having no dark colorant present, wherein said dark colorant is a blue or black dye, or said dark colorant is a modified carbon product comprising carbon having attached at least one organic group, or said dark colorant is an aggregate comprising a carbon phase and a silicon-containing species phase, or said dark colorant is a silica coated carbon black, or said dark colorant is an aggregate comprising a carbon phase and a metal-containing species phase, or combinations thereof.
A method of increasing the brightness of multi-layered coated paperboard or paper comprising a multi-layered coating of at least a first layer and a second layer, wherein said first layer comprises b) at least one white pigment, and c) at least one binder, and said second layer comprises a) at least one white pigment and b) at least one binder, wherein said method comprises including in said first layer a) a dark colorant, that increases the brightness of the multi-layered coated paperboard or paper, in an amount sufficient to reduce mottle on the paperboard or paper while increasing brightness compared to the mottle and brightness of the same paper or paperboard coated with the same multi-layered coating but having no dark colorant present, wherein said dark colorant is a blue or black dye, or said dark colorant is a modified carbon product comprising carbon having attached at least one organic group, or said dark colorant is an aggregate comprising a carbon phase and a silicon-containing species phase, or said dark colorant is a silica coated carbon black, or said dark colorant is an aggregate comprising a carbon phase and a metal-containing species phase, or combinations thereof.
A method to decrease the amount of a white pigment present in a coating on a paperboard or paper comprising the step of applying a multi-layered coating onto a paperboard or paper wherein said coating comprises at least a first layer and a second layer, wherein said first layer comprises a) at least one dark colorant, b) at least one white pigment, and c) at least one binder, and said second layer comprises a) at least one white pigment and b) at least one binder, wherein said dark colorant is present in an amount sufficient to reduce mottle on the paperboard or paper while increasing brightness compared to the mottle and brightness of the same paper or paperboard coated with the same multi-layered coating but having no dark colorant present, wherein said dark colorant is a blue or black dye, or said dark colorant is a modified carbon product comprising carbon having attached at least one organic group, or said dark colorant is an aggregate comprising a carbon phase and a silicon-containing species phase, or said dark colorant is a silica coated carbon black, or said dark colorant is an aggregate comprising a carbon phase and a metal-containing species phase, or combinations thereof.
Dependencies are inferred from the claim text.