Imaging particulates, paper and process, and imaging of paper using dual wavelength light

摘要

The present invention provides dual wavelength imaging compositions, processes for forming dual wavelength imaging compositions, methods for forming images using dual wavelength imaging compositions and substrate (e.g., paper web) treated (e.g., coated) on one or both sides with dual wavelength imaging compositions. Also provided is a dual wavelength imaging particulate comprising a matrix of polymer material and containing: one or more image-forming agents; a photo-oxidizing agent which is activated at a first wavelength of light to cause the one or more image-forming agents to form one or more images; and a reducing agent which is activated at a second wavelength of light to cause termination of the formation of the one or more images.

主权项

1. A process comprising the following steps:
(a) providing a substrate having first and second surfaces; and (b) providing a plurality of dual wavelength imaging particulates, wherein the particulates each comprise a polymeric matrix of polymer material in which is contained:
one or more imaging agents comprising a light activated dye;a photo-oxidizing agent which is activated at a first wavelength of light to cause the one or more image-forming agents to form one or more images in or on the substrate; anda reducing agent which is activated at a second wavelength of light to cause termination of the formation of the one or more images; and (c) treating at least one of the first and second surfaces of the substrate of step (a) with the particulates of step (b).