Patent ID: 6387500
Filing Date: 2002-05-14
Classification: B41M,D21H,Y10T

Abstract:
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.