摘要:
Desensitization of carbonless copy systems is provided by contacting an electron-accepting, color-reactant material capable of reacting with a substantially colorless chromogenic compound to form a visible image with a desensitizing agent comprising, in combination, a non-volatile, polyoxygenated compound and a strong chelating agent. In this manner, acid-reactive clay coatings typically used in carbonless copy paper systems are effectively desensitized and prevented from reacting with conventional chromogens, such as crystal violet lactone and benzoyl leuco methylene blue.
摘要:
A recording method and material employing a basic color former component which changes to a colored species by an interaction with a cellulose fiber and has a molecular extinction coefficient of not less than about 100 in an ethyl alcohol solution.
摘要:
Carbonless copy paper is prepared by placing a first sheet of paper coated on one side with a hydrophilic colloid solution in which are dispersed microcapsules of oil droplets containing a colorless electron donor dye into contact with a second sheet of paper coated with an absorbent and an electron accepting color developer compound. The heat resistance and moisture resistance of the copy paper is substantially improved by adding to the hydrophilic colloid solution a graft copolymer having a backbone of carboxymethyl cellulose or gum arabic and side chains of polyacrylic acid or polymethacrylic acid. The image response time of the second sheet can be improved by adding pectin or sulfated starch to the coating.
摘要:
The invention relates to a process for coloring surfaces in such a way that two juxtaposed colored areas cannot be visually perceived as distinct from one another unless their distance from the eye drops below a predetermined distance. The first area is colored by juxtapositioning unitary zones of at least two colors and the second area is colored by the resultant color of the optical mixture of the colors used for the first area. One important application of the invention is in display advertising.
摘要:
The invention relates to a developable surface comprising a carrier layer having thereon at least two deposits of one or more invisible inks in adjacent or overlapping relationship, said deposits in the developed state being unresolvable.
摘要:
This invention discloses novel pyrazoloxanthene compounds, useful as the color-formers or imaging sources in pressure-sensitive copy papers and in thermally-sensitive imaging papers, and a process for preparing these compounds.
摘要:
Process for the production of novel synthetic paper from thermoplastic polymer films in which the surface of the films are opacified by treatment with a liquid which swells and dissolves the polymer and thereafter treating with another liquid which coagulates the polymer. Intermediate treatments are employed to improve the products.
摘要:
A stabilizing agent for use in electron donor-acceptor carbonless copying systems. The stabilizing agent is 2,2'-methylene-bis(4-methyl-6-t-butyl phenol). Systems in which the stabilizing agent is useful comprise a color-forming composition comprising at least one leuco dye which is fadeable or discolorable after development, a color-developing composition comprising an acidic coreactant material capable of reacting with the color-forming composition to provide colored products, and the stabilizing agent. The stabilizing agent prevents discoloration or fade of images produced by reaction of the color-forming composition with the color-developing composition. In a preferred embodiment, the color-forming composition additionally comprises dithiooxamide and/or dithiooxamide derivatives, the color-developing composition additionally comprises a transition metal ion capable of reacting with the dithiooxamide compound to produce a purple-colored product, and the reaction of the color-forming composition with the color-developing composition results in a neutral black colored product.
摘要:
A pressure-recording process in which a methine dye is produced by bringing image-wise into reactive contact with the aid of pressure, a compound reacting as an acid with a dye precursor compound corresponding to the following general formula: ##EQU1## wherein: R.sub.1 represents (1) an aryl group substituted with an ether group R.sub.6 --O-- in which R.sub.6 represents a hydrocarbon group or (2) a heterocyclic group;R.sub.2 represents (1) an aryl group substituted with an ether group R.sub.6 --O-- in which R.sub.6 represents a hydrocarbon group, (2) a heterocylic group or (3) a ##EQU2## group, in which Z represents the necessary atoms to close a heterocylic nucleus,R.sub.3 represents (1) a --XH or --X--R.sub.7 group, in which X is oxygen or sulfur, and R.sub.7 is an organic group, (2) a ##EQU3## group in which each of R.sub.8 and R.sub.9 (same or different) represents hydrogen or an alkyl group, a cycloalkyl group, an aralkyl group, or an aryl group, or R.sub.8 and R.sub.9 together represent the necessary atoms to close a nitrogen-containing heterocyclic nucleus, or (3) a ##EQU4## group IN WHICH R.sub.10 represents an alkyl group or a cycloalkyly group, an aralkyl group, an aryl group or a heterocyclic group and R.sub.11 represents hydrogen or a group emumerated in the definition of R.sub.10, or R.sub.11 and R.sub.10 together represent sultam group,Each of R.sub.4 and R.sub.5 (same or different) represents hydrogen, a C.sub.1 - C.sub.5 alkyl group, a cycloalkyl group, an aralkyl group or an aryl group,n is 0 or 1, andm is 0 or 1.