US3924520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparing lithographic plates utilizing vinyl monomers containing hydrolyzable silane groups
Assignee: Hercules LLC
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Filing: 1974-06-27
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Granted: 1975-12-09
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Expires: 1994-06-27
Abstract
Abstract It has been found that photopolymer elements, particularly lithographic printing plates, can be prepared by (a) treating the surface of a polymer film with a photooxygenation sensitizer, said film being a film of a polymer containing extralinear olefinic unsaturation of the type in which there is no more than one hydrogen atom on each of the double bond carbons and in which there is at least one allylic hydrogen on at least one of the carbon atoms adjacent to the double bond carbons, which allylic hydrogen is not a bridgehead carbon, (b) exposing imagewise the sensitized film to light having a wave length from about 2,000 to about 12,000 angstroms in the presence of oxygen, (c) subjecting the exposed film to contact with a vinyl monomer containing a hydrolyzable silane group to effect graft polymerization of the vinyl silane monomer onto the light exposed areas of the polymer film, (d) removing ungrafted vinyl silane monomer from unexposed areas of the polymer film, (e) hydrolyzing the silane groups of the vinyl silane monomers grafted to the polymer film, and (f) amplifying the hydrophilicity of the hydrolyzed silane groups by treating with at least one amplifying agent selected from soluble silicate solutions and colloidal silica dispersions.
Inventors
- 👤 Harold Boardman
- 👤 David S Breslow
- 👤 David A Simpson
- 👤 Richard L Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:38
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/075; G03F7/0755; G03C; G03C1/00; G03C1/72; G03C1/73; G03C1/733; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/114; Y10S430/12; Y10S430/121
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
193 words
THE PROCESS OF MAKING A PHOTOGRAPHIC IMAGE WHICH COMPRISES PROVIDING THE SURFACE OF A POLYMER FILM WITH A PHOTOOXYGENATION SENSITIZER, SAID FILM BEING A FILM OF A POLYMER CONTAINING EXTRALINEAR OLEFINIC UNSATURATION OF THE TYPE IN WHICH THERE IS NO MORE THAN ONE HYDROGEN ATOM ON EACH OF THE DOUBLE BOND CARBONS AND IN WHICH THERE IS AT LEAST ONE ALLYLIC HYDROGEN ON AT LEAST ONE OF THE CARBONS ADJACENT O THE DOUBLE BOND CARBONS, WHICH ALLYLIC HYDROGEN IS NOT ON A BRIDGEHEAD CARBON, EXPOSING SELECTED AREA OF THE SENSITIZED FILM TO LIGHT HAVING A WAVE LENGTH OF FROM ABOUT 2000 TO ABOUT 12,000 ANGSTROMS IN THE PRESENCE OF OXYGEN, SUBJECTING THE EXPOSED FILM TO CONTACT WITH A VINYL MONOMER CONTAINING A HYDROLYZABLE SILANE GROUP TO EFFECT GRAFT POLYMERIZATION OF THE VINYL SILANE MONOMER ONTO LIGHT-EXPOSED AREAS OF THE POLYMER FILM, REMOVING UNGRAFTED VINYL SILANE MONOMER FROM UNEXPOSED AREAS OF THE POLYMER FILM, HYDROLYZING THE SILANE GROUPS OF THE VINYL SILANE MONOMERS GRAFTED TO THE POLYMER FILM, AND AMPLIFYING THE HYDROPHILICITY OF THE HYDROLZYED SILANE GROUPS BY TREATING WITH AT LEAST ONE AMPLIFYING AGENT SELECTED FROM SOLUBLE SILICATE SOLUTIONS AND COLLOIDAL SILICA DISPERSIONS.
Claim 2
Dependent Claim
193 words
THE PROCESS OF MAKING A PHOTOGRAPHIC IMAGE WHICH COMPRISES PROVIDING THE SURFACE OF A POLYMER FILM WITH A PHOTOOXYGENATION SENSITIZER, SAID FILM BEING A FILM OF A POLYMER CONTAINING EXTRALINEAR OLEFINIC UNSATURATION OF THE TYPE IN WHICH THERE IS NO MORE THAN ONE HYDROGEN ATOM ON EACH OF THE DOUBLE BOND CARBONS AND IN WHICH THERE IS AT LEAST ONE ALLYLIC HYDROGEN ON AT LEAST ONE OF THE CARBONS ADJACENT O THE DOUBLE BOND CARBONS, WHICH ALLYLIC HYDROGEN IS NOT ON A BRIDGEHEAD CARBON, EXPOSING SELECTED AREA OF THE SENSITIZED FILM TO LIGHT HAVING A WAVE LENGTH OF FROM ABOUT 2000 TO ABOUT 12,000 ANGSTROMS IN THE PRESENCE OF OXYGEN, SUBJECTING THE EXPOSED FILM TO CONTACT WITH A VINYL MONOMER CONTAINING A HYDROLYZABLE SILANE GROUP TO EFFECT GRAFT POLYMERIZATION OF THE VINYL SILANE MONOMER ONTO LIGHT-EXPOSED AREAS OF THE POLYMER FILM, REMOVING UNGRAFTED VINYL SILANE MONOMER FROM UNEXPOSED AREAS OF THE POLYMER FILM, HYDROLYZING THE SILANE GROUPS OF THE VINYL SILANE MONOMERS GRAFTED TO THE POLYMER FILM, AND AMPLIFYING THE HYDROPHILICITY OF THE HYDROLZYED SILANE GROUPS BY TREATING WITH AT LEAST ONE AMPLIFYING AGENT SELECTED FROM SOLUBLE SILICATE SOLUTIONS AND COLLOIDAL SILICA DISPERSIONS.
Claim 3
Dependent Claim
20 words
The process of claim 1 wherein the light has a wave length of from about 3900 to about 7700 angstroms.
Claim 4
Dependent Claim
13 words
The process of claim 1 wherein the amplifying agent is a soluble silicate.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein the amplifying agent is colloidal silica.
Claim 6
Dependent Claim
19 words
The process of claim 1 wherein the amplifying agent is a mixture of a soluble silicate and colloidal silica.
Claim 7
Dependent Claim
11 words
A photopolymer element prepared according to the process of claim 1.
Claim 8
Dependent Claim
13 words
The photopolymer element of claim 6 wherein the element is a lithographic plate.
Claim 9
Dependent Claim
130 words
In a process of preparing a lithographic printing plate which comprises providing the surface of a polymer film with a photooxygenation sensitizer, said film being a film of a polymer containing extralinear olefinic unsaturation, exposing the sensitized film imagewise to light in the presence of oxygen, the improvement of contacting the exposed film with a vinyl monomer containing a hydrolyzable silane group to effect graft polymerization of the vinyl silane monomer onto light-exposed areas of the polymer film, removing ungrafted vinyl silane monomer from unexposed areas of the polymer film, hydrolyzing the silane groups of the vinyl silane monomers grafted to the polymer film, and amplifying the hydrophilicity of the hydrolyzed silane groups by treating with at least one amplifying agent selected from soluble silicate solutions and colloidal silica dispersion.
Claim 10
Dependent Claim
130 words
In a process of preparing a lithographic printing plate which comprises providing the surface of a polymer film with a photooxygenation sensitizer, said film being a film of a polymer containing extralinear olefinic unsaturation, exposing the sensitized film imagewise to light in the presence of oxygen, the improvement of contacting the exposed film with a vinyl monomer containing a hydrolyzable silane group to effect graft polymerization of the vinyl silane monomer onto light-exposed areas of the polymer film, removing ungrafted vinyl silane monomer from unexposed areas of the polymer film, hydrolyzing the silane groups of the vinyl silane monomers grafted to the polymer film, and amplifying the hydrophilicity of the hydrolyzed silane groups by treating with at least one amplifying agent selected from soluble silicate solutions and colloidal silica dispersion.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |