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Transfer imaging system

a transfer imaging and imaging system technology, applied in the field of imaging systems, can solve the problems of not matured into commercial photocopy systems, the potential of these systems to afford a low cost imaging system has not been realized, and the capsules are unswellable, etc., to achieve the effect of superior tonal quality and versatile present invention

Inactive Publication Date: 2001-07-03
EASTMAN KODAK CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Another object of the present invention is to provide an imaging system based on a photosensitive encapsulate which provides images with high resolution and good tonal qualities.
The imaging system of the present invention is quite versatile. It is useful in making copies from printed documents, duplicating blue prints and other line drawings, among other utilities. The invention system can be used to produce monochromatic copies in black or any other color. Some of its principal advantages are the superior tonal quality of the images that are obtained and the fact that imaging can be accomplished using a fairly simple exposure apparatus.

Problems solved by technology

Forris, U.S. Pat. No. 3,001,873, discloses a more complex system wherein the walls of capsules containing a solid dye are photosensitized such that patterned exposure renders the capsules unswellable.
While image-forming techniques such as these have been known, for various reasons, they have not matured into commercial photocopy systems.
Furthermore, the potential of these systems to afford a low cost imaging system has not been realized.

Method used

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Examples

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Effect test

example 1

Ultraviolet Photosensitive Microcapsule Preparation (UF Capsules)

To 25 parts of a filtered solution prepared by dissolution of 5.0 parts of gum arabic (Celanese, grade A-13, gum arabic special) in 50.0 parts of distilled water was added with stirring 26.9 parts of a 17.1% (total solids) solution of isobutylene / maleic anhydride copolymer and sodium hydroxide, prepared by addition of 5.44 parts of isobutylene / maleic anhydride copolymer (average molecular weight 1.0.times.10.sup.6) and 2 parts of sodium hydroxide in 32.5 parts of distilled water with stirring and heating to 92.degree. C. for 2 hours. Subsequently 38.3 parts of distilled water was added and after heating to 60.degree. C. the pH of the resulting mixture was adjusted to 4.0 (from an initial pH of 8.8) by the portionwise addition of 10% (V / V) aqueous sulfuric acid. With maintenance of the 60.degree. C. temperature and constant stirring, 6.6 parts of urea and 0.8 parts of resorcinol were added and the pH of the mixture was ...

example 2

Ultraviolet Photosensitive Microcapsule Preparation (UF Capsules)

An aqueous phase was prepared in exactly the same manner and proportions as described in Example #1.

Preparation of an organic phase proceeded as follows: to 50.0 parts of tetraethylene glycol diacrylate (TEGDA) was added with heating to 90.degree. C. and stirring 3.0 parts of the same color precursor mentioned in Example 1. After complete dissolution of the dye precursor the mixture was allowed to cool to 60.degree. C. and 2.5 parts of benzoin methyl ether and 1.0 parts of bis-4,4'-(dimethylamino) benzophenone were added successively and the mixture was stirred at 60.degree. C. until complete dissolution occurred. The organic phase was maintained at 60.degree. C. for immediate use.

The preparation of the urea-formaldehyde capsules proceeded exactly as described in Example 1, with the following important modification and observation: after careful addition of the organic phase to the aqueous phase in the blender, the ble...

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Abstract

A transfer imaging system is disclosed wherein images are formed by image-wise exposing a layer comprising a chromogenic material and pressure rupturable capsules containing, as an internal phase, a photosensitive composition. In a preferred embodiment, the chromogenic material is encapsulated with the photosensitive composition. Upon exposure and capsule rupture the chromogenic material is image-wise transferrable to a developer or copy sheet where the chromogenic material reacts with a developer to form an image. Preferred systems are sensitive to U.V. or blue light in the wavelength range of 380 to 480 nm.

Description

BACKGROUND OF THE INVENTIONThe present invention relates to an imaging system and more particularly to an office based system which is suitable for making photocopies. In accordance with the invention, images are formed by image-wise exposing a composition comprising a chromogenic material and photosensitive encapsulate to actinic radiation and rupturing the capsules in the presence of a developer whereby a patterned reaction between the chromogenic material and developer is obtained which produces an image. This application specifically addresses transfer systems in which the capsules are ruptured in contact with a developer sheet to which chromogenic material is transferred for the patterned image-forming reaction.Imaging systems based on photosensitive encapsulates are known. Berman, U.S. Pat. No. 3,219,446 discloses a transfer imaging process in which azo-blue-"B" black dye is encapsulated with a cross-linkable polymer or a polymerizable monomer as a fluid-droplet containing fil...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G03F7/00
CPCG03F7/002G03B2227/325Y10T428/2987Y10T428/2985Y10T428/2989Y10S430/163
Inventor SANDERS, FREDERICK W.
Owner EASTMAN KODAK CO
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