 UV absorbers |
| What is claimed is: 1. A compound of the formula ##STR34## in which the radicals R.sub.1, ... |
|
| Production of filled paper |
| OF THE INVENTION A process according to the invention for making filled paper comprises providing ... |
|
| Ink compositions |
| What is claimed is: 1. An ink composition containing as stabiliser at least one water-soluble ... |
|
| Ink-jet ink |
| What is claimed is: 1. An ink-jet ink comprising in combination at least one compound selected from ... |
|
| Adsorption air conditioning system |
| It is an object of the present invention to provide an air conditioning adsorption system for ... |
|
| Magnetic composition, magnetic toner and ink containing the magnetic composition |
| It is therefore a first object of the present invention to provide a magnetic composition, which ... |
|
| Ink for ink jet printers |
| OF THE INVENTION The present invention relates generally to an improved ink comprising a light-... |
|
| Ink for ink jet printers |
| OF THE INVENTION The present invention relates generally to an improved ink comprising a light-... |
|
| Method of generating a reactive species and polymer coating applications therefor |
| The present invention addresses some of the difficulties and problems discussed above by the ... |
|
|
Element containing latent image suited for aqueous wash-out development
| Details |
Inventors: Ma, Sheau-Hwa; Matthews, Andrew E.;
Assignee: E. I. Du Pont de Nemours and Company (Wilmington, DE)
Primary Examiner: Epstein; Henry F.
Assistant Examiner:
Attorney, Agent or Firm:
A method for preparing high resolution negative-working wash-off relief images comprising the sequential steps of: (a) providing a non-photosensitive, aqueous processable layer, preferably on a substrate, said layer comprising a dispersion of solvent-coalesceable particles in a polymer matrix; (b) imagewise applying an ink to the non-photosensitive layer to coalesce the particles and form a water-insoluble polymer blend between the particles and the polymer matrix in the ink applied areas; and (c) washing the layer with an aqueous developer solution to remove the non-ink applied areas of the layer. |
|
DETAILED DESCRIPTION OF THE INVENTION The present invention offers several advantages over the prior art described above.
For example, the present invention is more environmentally sound than the prior art because it utilizes aqueous solutions for development.
In addition, the present process does not use potentially toxic monomers, and requires no additional heating or exposure steps, whereby the process is safer and easier to use.
Images formed by the present process have surprisingly good resolution and sharp edges.
The element can be washed to develop the image immediately after the image layer has been applied, which greatly simplifies the process and improves efficiency.
On the other hand, the reaction between the ink and the non-photosensitive layer forms a stable, water-insoluble polymer blend, whereby, if desired, the element can be stored with the latent image intact for an indefinite period of time prior to being developed with an aqueous solution.
The preferred elements for use in the present process comprise a substrate having a non-photosensitive layer applied thereto, wherein the non-photosensitive layer comprises a dispersion of solvent-coalesceable particles in a water-soluble or water swellable polymer matrix.
Substrates The substrate may be any suitable film of screen which has the necessary stiffness, dimensional stability, adhesion to the non-photosensitive layer and the ability to withstand the aqueous processing conditions.
Examples of useful substrates include glass, cellulose triacetate, polyethylene terephthalate, etc.
A removable substrate is required for the preparation of a multicolor image.
Gelatin subbed and resin subbed polyethylene terephthalate films are preferred for this application.
In applications such as printing plates, solder masks and printed circuits, the substrate may contain metal.
Typical substrates for resist applications include combinations such as phenolic or epoxy resins on paper or a paper-glass composite, as well as polyester, epoxy, polyimide, polytetrafluoroethylene or polystyrene on glass
|
|
Quantum Computing 
