US4286046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparation of multicolor surprint proofs with silica overcoat
Assignee: EIDP Inc
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Filing: 1979-06-04
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Granted: 1981-08-25
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Expires: 1999-06-04
Abstract
Abstract Process for preparation of multicolor surprint proofs from a composite photoimaged element, e.g., photopolymer element, having, in order, a sheet support, at least two colored photoimaged elements, and a layer of colloidal silica applied thereon, said colloidal silica being coated from a substantially aqueous dispersion wherein the colloidal silica has an average particle diameter of less than 500 nm and wherein at least 75% of the solids of said dispersion are silica, the silica layer being at least 20 mg/dm 2 when dried. The multicolor proofs obtained contain a sharp image free from any three-dimensional effects and have a delustered, matte appearance which simulates printed press sheets.
Inventors
- 👤 Abraham B. Cohen
- 👤 Roxy Fan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:33
CPC Classifications
G; G03; G03C; G03C11/00; G03F; G03F3/00; G03F3/10; G03F3/103; G03F7/00; G03F7/26; G03F7/28; Y; Y10; Y10S; Y10S430/00; Y10S430/151
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
107 words
In a process for preparing a multicolor proof with improved image sharpness comprising a surprint having at least two nonplanar, nonsilver halide colored photoimaged elements on a support, the improvement comprising (a) coating on said photoimaged surprint at least one layer of colloidal silica from a substantially aqueous dispersion containing colloidal silica particles in a range of 10 to 60% by weight of solids wherein the colloidal silica has an average particle diameter of less than 500 nm and at least 75% of the solids of said dispersion are silica, and (b) drying the layer to a dried coating weight of at least 20 mg/dm 2 .
Claim 2
Dependent Claim
107 words
In a process for preparing a multicolor proof with improved image sharpness comprising a surprint having at least two nonplanar, nonsilver halide colored photoimaged elements on a support, the improvement comprising (a) coating on said photoimaged surprint at least one layer of colloidal silica from a substantially aqueous dispersion containing colloidal silica particles in a range of 10 to 60% by weight of solids wherein the colloidal silica has an average particle diameter of less than 500 nm and at least 75% of the solids of said dispersion are silica, and (b) drying the layer to a dried coating weight of at least 20 mg/dm 2 .
Claim 3
Dependent Claim
13 words
A process according to claim 1 wherein the photoimaged elements are photopolymer elements.
Claim 4
Dependent Claim
20 words
A process according to claim 2 wherein a nonimaged photopolymer element is present as the outer element of said proof.
Claim 5
Dependent Claim
24 words
A process according to claims 1 or 2 or 3 wherein the aqueous colloidal silica solution contains at least one wetting agent or surfactant.
Claim 6
Dependent Claim
16 words
A process according to claim 4 wherein the aqueous colloidal silica solution contains an antifoaming agent.
Claim 7
Dependent Claim
20 words
A process according to claims 1 or 2 or 3 wherein the aqueous colloidal silica layer is coated by rollers.
Claim 8
Dependent Claim
38 words
A process according to claim 3 wherein the nonimaged photopolymer element consists essentially of a layer comprising a nontacky photohardenable material with ethylenically unsaturated or benzophenone type groups and a contiguous layer of a nonphotosensitive tacky organic material.
Claim 9
Dependent Claim
42 words
A process according to claim 3 wherein the nonimaged photopolymer element is a layer containing at least one free radical initiated, chain propagating, addition polymerizable compound containing at least one terminal ethylenic group, and an addition polymerization initiator activatable by actinic radiation.
Claim 10
Dependent Claim
12 words
A process according to claim 8 wherein said photopolymer layer is nontacky.
Claim 11
Dependent Claim
57 words
A process according to claim 3 wherein the sheet support bears four colored imaged photopolymer elements and the aqueous colloidal silica coated on the surface of the nonimaged photopolymer element has an average particle diameter of 2 to 90 nm and is dried to a dried coating weight of 40 mg/dm 2 to 250 mg/dm 2 .
Claim 12
Dependent Claim
24 words
A process according to claim 1 wherein the aqueous dispersion contains up to 25% of total solids of at least one water soluble binder.
Claim 13
Dependent Claim
23 words
A process according to claim 1 wherein the aqueous dispersion contains up to 25% of total solids of a water dispersible polymer emulsion.
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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) | 1984-08-24 | 1985-02-23 | 1985-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-24 | 1989-02-23 | 1989-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-24 | 1993-02-23 | 1993-08-25 | $7700.00 | Window Closed / Lapsed |