Patent US4252879A successfully refreshed from Google Patents.
US4252879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image recording material having optically different particles
Assignee: Dai Nippon Printing Co Ltd
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Filing: 1979-08-03
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Granted: 1981-02-24
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Expires: 1999-08-03
Abstract
Abstract An image recording material formed with a support, a photosensitive composition layer formed on the support, and a mono-particle layer of solid particles of different optical transmittances formed on the photosensitive composition layer. When the recording material is exposed to light, the firmness with which the photosensitive composition holds the solid particles varies locally from point to point in accordance with the exposure energies of light passed through the solid particles. Thus by causing the dissolving force of the solvent or other physical forces to act on the photosensitive composition, the particles held weakly are selectively removed from the recording material, whereby an image is formed by the particles left on the recording material. The recording material on which the image has been formed can be used as a printing form as it is or by being subjected to simple after-treatment.
Inventors
- 👤 Eiichi Inoue
- 👤 Masanori Akada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:17
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/09; G03F7/115; G03F7/26; G03F7/28; Y; Y10; Y10S; Y10S430/00; Y10S430/151
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
80 words
An image recording material comprising: a support; a first layer of photosensitive composition formed on said support; and a single uniform and dense layer of solid particles having at least two different optical transmittances formed on said first layer, said photosensitive composition having a particle holding characteristic which is varied by exposure to light, said particles having an average grain size of from 5 to 100 μm and an optical density of 0.01 to 2.5 and not overlying each other.
Claim 2
Dependent Claim
80 words
An image recording material comprising: a support; a first layer of photosensitive composition formed on said support; and a single uniform and dense layer of solid particles having at least two different optical transmittances formed on said first layer, said photosensitive composition having a particle holding characteristic which is varied by exposure to light, said particles having an average grain size of from 5 to 100 μm and an optical density of 0.01 to 2.5 and not overlying each other.
Claim 3
Dependent Claim
35 words
An image recording material as claimed in claim 1, in which the solubility with respect to a solvent of said photosensitive composition is varied by exposure to light, whereby said particle holding characteristic is varied.
Claim 4
Dependent Claim
38 words
An image recording material as claimed in claim 1, in which the phase of said photosensitive composition is changed from a liquid phase to a solid phase by exposure to light, whereby said particle holding characteristic is varied.
Claim 5
Dependent Claim
33 words
An image recording material as claimed in claim 1, in which said photosensitive composition has a particle adhesion characteristic which is varied by exposure to light, whereby said particle holding characteristic is varied.
Claim 6
Dependent Claim
36 words
An image recording material as claimed in claim 1, in which said photosensitive composition has a characteristic of adhering to said support which is varied by exposure to light, whereby said particle holding characteristic is varied.
Claim 7
Dependent Claim
23 words
An image recording material as claimed in claim 1, in which the thickness of said first layer is from 1 to 500 μm.
Claim 8
Dependent Claim
19 words
An image recording material as claimed in claim 1, in which said solid particles are different in color hue.
Claim 9
Dependent Claim
24 words
An image recording material as claimed in claim 1, in which said solid particles are spherical, elliptical or mixtures of spherical and elliptical particles.
Claim 10
Dependent Claim
37 words
An image recording material as claimed in claim 1, in which said solid particles are transparent or semitransparent particles selected from the group consisting of plastic particles, crystalline starch particles, glass particles, wax particles and mixtures thereof.
Claim 11
Dependent Claim
54 words
An image recording method comprising: exposing to light an image recording material as claimed in claim 1 and subjecting the exposed image recording material thus exposed to development so that said solid particles are left on said image recording material responsively according to exposure energies of light to which the photosensitive composition is exposed.
Claim 12
Dependent Claim
54 words
A printing form produced by exposing to light an image recording material as claimed in claim 1, and then subjecting the image recording material thus exposed to development so that said solid particles are left on said image recording material responsively according to exposure energies of light to which the photosensitive composition is exposed.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |