Patent US3877939A successfully refreshed from Google Patents.
US3877939A
Expired / Lapsed
US
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Photopolymer printing plates and coated relief printing plates
Assignee: Napp Systems USA Inc
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Filing: 1973-06-25
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Granted: 1975-04-15
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Expires: 1993-06-25
Abstract
Abstract A photopolymer printing plate developable with water which includes a support material, the adhering surface of which is both abraded and treated with an aqueous solution of a chromic compound, such as chromic acid, a thin primer layer to improve adhesion, and a layer of a water-soluble photosensitive resin composition comprising at least one unsaturated ethyleric compound, preferably having a boiling point about 100*C., a molecular weight below 1500 and 1 to 4 polymerizable ethylenic groups, said ethylenic compound being polymerizable by means of actinic light in the presence of a photopolymerization initiator, a photopolymerization initiator and a partially saponified polyvinyl acetate. The plates can be used as printing plates or can be used to prepare relief images. In this latter form, e.g., relief printing plates, the plates are preferably treated with a water-repellant solution containing a dimethylpolysiloxane to make the plates water resistant and to reduce linting problems during subsequent use.
Inventors
- 👤 Sakuo Okai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:35
CPC Classifications
B; B41; B41N; B41N3/00; B41N3/03; B41N3/038; G; G03; G03F; G03F7/00; G03F7/004; G03F7/027; G03F7/032; G03F7/033; G03F7/09; G03F7/11; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/114; Y10S430/117
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
266 words
IN A PHOTOPOLYMER PRINTING PLATE DEVELOPABLE WITH WATER AND INCLUDING A METALLIC SUPPORT MATERIAL AND A LAYER OF A WATER-SOLUBLE PHOTOSENSITIVE RESIN COMPOSITION DISPOSED THEREON, SAID RESIN COMPOSITION INCLUDING: A. ABOUT 0.001 TO 0.15 PARTS BY WEIGHT OF A POLYMERIZATION INITIATOR ACTIVATABLE BY ACTINIC LIGHT; B. ABOUT 0.1 TO 3.0 PARTS BY WEIGHT OF AT LEAST ONE UNSATURATED ETHYLENIC MONOMER CAPABLE OF FORMING A POLYMER BY PHOTO-INITIATED POLYMERIZATION IN THE PRESENCE OF A POLYMERIZATION INITIATOR ACTIVATABLE BY ACTINIC; AND C. ABOUT 0.1 TO 1.0 PARTS BY WEIGHT OF A PARTIALLY SAPONIFIED, WATER-SOLUBLE, POLYVINYL ACETATE POLYMER COMPATIBLE WITH SAID MONOMRS, CONTAINING BOTH ACETYL AND HYDROXY GROUPS, AND HAVING A POLYMERIZATION DEGREE OF ABOUT 300 TO 2000 AND A SAPONIFICATION DEGREE OF ABOUT 65 TO 99 MOLE PERCENT, THE IMPROVEMENT COMPRISING THE SURFACE OF SAID METALLIC SUPPORT MATERIAL BEING TREATED WITH A TREATING COMPOSITION CONTAINING WATER, A CHROMIC COMPOUND SELECTED FROM THE GROUP CONSISTNG OF CHROMIC ACID OR SODIUM BICHROMATE, AND AT LEAST ONE ADDITIONAL COMPONENT SELECTED FROM THE GROUP CONSISTING OF POTASSIUM FERRICYANIDE, POTASSIUM FLUOSILICATE, SODIUM FERROCYANIDE, SODIUM FLUOBORATE, AND POTASSIUM FLOZIRCONATE; AND SAID TREATED METALLIC SUPPORT MATERIAL HAVING APPLIED THERETO PRIOR TO THE DEPOSITION OF SAID RESIN COMPOSITION THEREON A THIN LAYER OF AN ADHESIONPROMOTING PRIMER COMPOSITION SELECTED FROM THE GROUP CONSISTING OF AN AQUEOUS SOLUTION OF PARTIALLY SAPONIFIED POLYVINYL ACETATE, A MIXTURE OF B-HYDROXYETHYL METHACRYALTE, WATER AND PARTIALLY SAPONIFIED POLYVINYL ACETATE, AND A MIXTURE OF PARTIALLY SAPONIFIED POLYVINYL ACETATE AND AN EMULSION OF ETHYLENE-ACRYLIC ACID COPOLYMER RESIN, AND LAYER OF ADHESIONPROMOTING PRIMER LAYER HAVING A THICKNESS IN THE RANGE OF ABOUT 0.1 TO 0.4 MIL.
Claim 2
Dependent Claim
266 words
IN A PHOTOPOLYMER PRINTING PLATE DEVELOPABLE WITH WATER AND INCLUDING A METALLIC SUPPORT MATERIAL AND A LAYER OF A WATER-SOLUBLE PHOTOSENSITIVE RESIN COMPOSITION DISPOSED THEREON, SAID RESIN COMPOSITION INCLUDING: A. ABOUT 0.001 TO 0.15 PARTS BY WEIGHT OF A POLYMERIZATION INITIATOR ACTIVATABLE BY ACTINIC LIGHT; B. ABOUT 0.1 TO 3.0 PARTS BY WEIGHT OF AT LEAST ONE UNSATURATED ETHYLENIC MONOMER CAPABLE OF FORMING A POLYMER BY PHOTO-INITIATED POLYMERIZATION IN THE PRESENCE OF A POLYMERIZATION INITIATOR ACTIVATABLE BY ACTINIC; AND C. ABOUT 0.1 TO 1.0 PARTS BY WEIGHT OF A PARTIALLY SAPONIFIED, WATER-SOLUBLE, POLYVINYL ACETATE POLYMER COMPATIBLE WITH SAID MONOMRS, CONTAINING BOTH ACETYL AND HYDROXY GROUPS, AND HAVING A POLYMERIZATION DEGREE OF ABOUT 300 TO 2000 AND A SAPONIFICATION DEGREE OF ABOUT 65 TO 99 MOLE PERCENT, THE IMPROVEMENT COMPRISING THE SURFACE OF SAID METALLIC SUPPORT MATERIAL BEING TREATED WITH A TREATING COMPOSITION CONTAINING WATER, A CHROMIC COMPOUND SELECTED FROM THE GROUP CONSISTNG OF CHROMIC ACID OR SODIUM BICHROMATE, AND AT LEAST ONE ADDITIONAL COMPONENT SELECTED FROM THE GROUP CONSISTING OF POTASSIUM FERRICYANIDE, POTASSIUM FLUOSILICATE, SODIUM FERROCYANIDE, SODIUM FLUOBORATE, AND POTASSIUM FLOZIRCONATE; AND SAID TREATED METALLIC SUPPORT MATERIAL HAVING APPLIED THERETO PRIOR TO THE DEPOSITION OF SAID RESIN COMPOSITION THEREON A THIN LAYER OF AN ADHESIONPROMOTING PRIMER COMPOSITION SELECTED FROM THE GROUP CONSISTING OF AN AQUEOUS SOLUTION OF PARTIALLY SAPONIFIED POLYVINYL ACETATE, A MIXTURE OF B-HYDROXYETHYL METHACRYALTE, WATER AND PARTIALLY SAPONIFIED POLYVINYL ACETATE, AND A MIXTURE OF PARTIALLY SAPONIFIED POLYVINYL ACETATE AND AN EMULSION OF ETHYLENE-ACRYLIC ACID COPOLYMER RESIN, AND LAYER OF ADHESIONPROMOTING PRIMER LAYER HAVING A THICKNESS IN THE RANGE OF ABOUT 0.1 TO 0.4 MIL.
Claim 3
Dependent Claim
42 words
The photopolymer printing plate of claim 1 wherein said metallic support material is aluminum and wherein the surface of said metallic support material after treatment with said treating composition absorbs light having a wavelength between about 300 and 400 m Mu .
Claim 4
Dependent Claim
53 words
The photopolymer printing plate of claim 1 wherein said partially saponified polyvinyl acetate polymer comprises one or more partially saponified polyvinyl acetate polymers having different saponification degrees, wherein the arithmetic average of the different saponification degrees, based upon the weight percent of each polymer, is within the range of about 65-99 mole percent.
Claim 5
Dependent Claim
122 words
The photopolymer printing plate of claim 1 wherein said unsaturated ethylenic monomers comprise at least one monofunctional monomer and at least one polyfunctional monomer, and are selected from the group consisting of (a) an acrylic or methacrylic ester or a lower alkanol having at least one hydroxy group and (b) an acrylic or methacrylic ester of a polyethylene glycol having an eter or ester group at the end opposite from said ester moiety, the number of ethylene oxide units in said polyethylene glycol ester being 1 to 9 to 23 , and wherein said photopolymerization initiator is selected from the group consisting of benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin octyl ether, benzoin vinyl ether and benzoin allyl ether.
Claim 6
Dependent Claim
20 words
The photopolymer printing plate of claim wherein said treating composition contains about 2 percent by weight of said chromic compound.
Claim 7
Dependent Claim
58 words
The photopolymer printing plate of claim 1 wherein said metallic support material is aluminum and said support material is treated with said treating composition for a period of time such that the surface of said support material will absorb light having a wavelength in the range of that required to initiate the polymerization of said photosensitive resin composition.
Claim 8
Dependent Claim
130 words
In a relief photopolymer printing plate developable with water and including a support material, a thin layer of adhesive composition, and a layer of a water soluble photosensitive resin composition disposed thereon, said composition comprising about 0.1 to 3.0 parts by weight of at least one unsaturated ethylenic monomer having a boiling point above 100*C, a molecular weight below 1500 and 1 to 4 polymerizable ethylenic groups, said ethylenic monomer being polymerizable by means of actinic light in the presence of photopolymerization initiator, about 0.001 to 0.15 parts by weight of a partially saponifieD polyvinyl acetate, the improvement comprising: coating the surface of the developed relief plate with a silicon oil solution selected from the group consisting of methylphenylsilicon oil having methylphenyl groups or dimethylpolysiloxane represented by the structural formula:
Claim 9
Dependent Claim
130 words
In a relief photopolymer printing plate developable with water and including a support material, a thin layer of adhesive composition, and a layer of a water soluble photosensitive resin composition disposed thereon, said composition comprising about 0.1 to 3.0 parts by weight of at least one unsaturated ethylenic monomer having a boiling point above 100*C, a molecular weight below 1500 and 1 to 4 polymerizable ethylenic groups, said ethylenic monomer being polymerizable by means of actinic light in the presence of photopolymerization initiator, about 0.001 to 0.15 parts by weight of a partially saponifieD polyvinyl acetate, the improvement comprising: coating the surface of the developed relief plate with a silicon oil solution selected from the group consisting of methylphenylsilicon oil having methylphenyl groups or dimethylpolysiloxane represented by the structural formula:
Claim 10
Dependent Claim
22 words
The coated relief photopolymer printing plate of claim 4 wherein said silicon oil is dissolved in an aromatic solvent for said oil.
Claim 11
Dependent Claim
33 words
The coated relief photopolymer printing plate of claim 8 wherein the solution of silicon oil in aromatic solvent contains silicon oil in a concentration range of about 10 to 40 percent by weight.
Claim 12
Dependent Claim
38 words
The coated relief photopolymer printing plate of claim 4 wherein the thickness of said coating of silicon oil solution on the surface of the relief photopolymer printing plate is in the range of about 8 to 12 microns.
Claim 13
Dependent Claim
69 words
The coated relief photopolymer printing plate of claim wherein said photopolymerization initiator is a benzoin alkylate compound, said support material is a metallic plate, and said partially saponified polyvinyl acetate comprises one or more partially saponified polyvinyl acetate polymers having different degrees of saponification and different degrees of polymerization, wherein the average degree of polymerization is 300 to 2000 and average saponification degree is 65 to 99 mole percent.
Claim 14
Dependent Claim
124 words
The coated relief photopolymer printing plate of claim 4 wherein said support material is a metallic plate which has been treated with a composition containing water, a chromic compound selected from the group consisting of chromic acid or sodium bichromate, and at least one additional component selected from the group consisting of potassium ferricyanide, potassium fluosilicate, sodium ferrocyanide, sodium fluoborate, and potassium fluozirconate, and wherein said adhesion layer is an adhesion-promoting composition having a thickness between about 0.1 and 0.4 mil and selected from the group consisting of an aqueous solution of partially saponified polyvinyl acetate, a mixture of Beta -hydroxyethyl methacrylate, water and partially saponified polyvinyl acetate, and a mixture of partially saponified polyvinyl acetate and an emulsion of ethylene-acrylic acid copolymer resin.
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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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |