US3894873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry planographic printing plate
Assignee: Toray Industries Inc
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Filing: 1973-03-21
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Granted: 1975-07-15
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Expires: 1993-03-21
Abstract
Abstract Presensitized planographic printing plate for use in dry planography. A positive acting plate having a flexible base and a relatively thick (0.02 to 2.00 mil) silicone rubber layer, overlying a photo-polymerizable and photoadhesive-layer. Upon exposure to light through a positive transparency, the photoadhesive layer in the exposed non-image area polymerizes and adheres firmly to the thick silicone rubber overlayer, but the photoadhesive layer in the unexposed image area remains nonadhesive to the silicone overlayer. Following the exposure, the surface of the plate is treated with developing liquid capable of swelling silicone rubber. The thick silicone rubber layer in the unexposed image area is easily removed, exposing a sharp image of oleophilic photoadhesive layer underlying the removed silicone layer, while the silicone rubber layer in the exposed background area remains bound to the photoadhesive underlayer. The exposed surface of the photoadhesive layer accepts ink from inking rollers, while the silicone rubber background area does not remove ink from the rollers, and thus remains ink-free.
Inventors
- 👤 Masaharu Kobayashi
- 👤 Masao Iwamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:57
CPC Classifications
B; B41; B41N; B41N1/00; B41N1/003; B41M; B41M1/00; B41M1/06; B41M1/08; G; G03; G03F; G03F7/00; G03F7/004; G03F7/075; G03F7/0752; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/106; Y10S430/114; Y10S430/124
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
196 words
A positive acting presensitized dry planographic printing plate comprising: a. a base layer having sufficient strength to withstand the stress normally encountered in a printing process; b. a oleophilic photoadhesive layer secured to and overlying the said base layer, and containing an ethylenically unsaturated photopolymerizable monomer or oligomer having the property of polymerizing when exposed to actinic light; c. a silicone rubber layer secured to and overlying the said photoadhesive layer, wherein selected portions of said photoadhesive layer, when polymerized by actinic light, are adherable locally to said overlying silicone rubber layer; and d. said silicone laYer being composed of a material having the property of swelling in the presence of a swelling agent, wherein swollen non-adhered portions of said silicone rubber layer are readily removable to provide an ink-receptive surface in the image area; and wherein said removal may be accomplished by the action of a developing liquid having swelling properties and being capable of being absorbed by the said silicone rubber layer, and of causing swelling of said silicone layer, while the portions of the silicone rubber layer which are adhered to said photoadhesive layer remain securely adhered and provide an ink-repellent background area.
Claim 2
Dependent Claim
196 words
A positive acting presensitized dry planographic printing plate comprising: a. a base layer having sufficient strength to withstand the stress normally encountered in a printing process; b. a oleophilic photoadhesive layer secured to and overlying the said base layer, and containing an ethylenically unsaturated photopolymerizable monomer or oligomer having the property of polymerizing when exposed to actinic light; c. a silicone rubber layer secured to and overlying the said photoadhesive layer, wherein selected portions of said photoadhesive layer, when polymerized by actinic light, are adherable locally to said overlying silicone rubber layer; and d. said silicone laYer being composed of a material having the property of swelling in the presence of a swelling agent, wherein swollen non-adhered portions of said silicone rubber layer are readily removable to provide an ink-receptive surface in the image area; and wherein said removal may be accomplished by the action of a developing liquid having swelling properties and being capable of being absorbed by the said silicone rubber layer, and of causing swelling of said silicone layer, while the portions of the silicone rubber layer which are adhered to said photoadhesive layer remain securely adhered and provide an ink-repellent background area.
Claim 3
Dependent Claim
29 words
The positive acting presensitized plate of claim 1 wherein said silicone rubber layer comprises cross-linked diorganopolysiloxane obtained by curing silicone gums comprising diorganopolysiloxanes having the central repeating unit of
Claim 4
Dependent Claim
40 words
The presensitized plate of claim 1 wherein: said photoadhesive layer comprises an ethylenically unsaturated photopolymerizable monomer or oligomer having a boiling point above 100*C, a photoinitiator, and, if necessary, an inhibitor of heat polymerization, polymeric materials or an inorganic powder.
Claim 5
Dependent Claim
49 words
The presensitized plate of claim 3 wherein said ethylenically unsaturated photopolymerizable monomer or oligomer comprises acrylic or methacrylic monomer or oligomer having a boiling point above 100*C being derived from monoalcohols or monoamines having less than 30 carbon atoms or polyalcohols or polyamines having less than 80 carbon atoms.
Claim 6
Dependent Claim
23 words
The presensitized plate of claim 4 wherein said acrylic or methacrylic monomer comprises dimethylaminoethyl methacrylate; (poly)ethyleneglycol dimethacrylate, 3-chloro-2-hydroxypropyl methacrylate, N,N,N'',N''-tetrakis-2-hydroxy-3-methacryloyloxypropylxylylenediamine, N-methoxymethylacrylamide, or hydrxyacetoneacrylamide.
Claim 7
Dependent Claim
36 words
The presensitized plate of claim 3 wherein the photoinitiator is a member selected from the group consisting of benzophenone, p,p''di-dimethylaminobenzophenone, xanthone, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, dibenzyl disulfide, and uranyl nitrate.
Claim 8
Dependent Claim
57 words
The presensitized plate of claim 3 wherein the polymeric material is a member from the group consisting of unsaturated polyester resins composed of units selected from ethylene oxide, propylene oxide, phthalic acids, bisphenol A maleic anhydride and fumalic acid, polyvinyl acetate, ethylene-vinyl acetate copolymer, vinyl chloridevinyl acetate copolymer polyethyl(meth)acrylate, polybutyl(meth)acrylate, polyoctyl(meth)acrylate, polyethylene oxide, and soluble nylon copolymers.
Claim 9
Dependent Claim
25 words
The presensitized plate of claim 1 wherein said developing liquid comprises paraffinic hydrocarbons, or aromatic hydrocarbons having a distillation range 10*-300*C, as a major component.
Claim 10
Independent Claim
209 words
A METHOD OF PRODUCING A POSITIVE ACTING PRESENSITIZED DRY PLANOGRAPHIC PRINTING PLATE, SAID METHOD COMPRISING THE STEPS OF: A. PROVIDING A BASE LAYER HAVING SUFFICIENT STRENGTH TO WITHSTAND THE STRESS NORMALLY ENCOUNTERED IN A PRINTING PROCESS: B. APPLYING A PHOTOADHESIVE LAYER OVERLYING THE SAID ASE LAYER, SAID PHOTOADHESIVE LAYER BEING CAPABLE OF POLYMERIZING WHEN EXPOSED TO ACTINIC LIGHT: C. APPLYING A SILICONE RUBBER LAYER OVERLYING THE SAID PHOTOADHESIVE LAYER: D. EXPOSING SAID PHOTOADHESIVE LAYER TO ACITINIC LAIGHT THROUGH A POSITIVE TRANSPARENCY HAVING IMAGE AND NON-IMAGE AREAS AND THROUGH SAID SILICONE RUBBER LAYER TO POLYMERIZE THE NON-IMAGE AREAS OF SAID PHOTO ADHESVE LAYER AND BIND SAME TO SAID OVERLYING SILICONE RUBBER LAYER: E. APPLYING A DEVELOPING LIQUID TO SAID SILICONE RUBBER, SAID DEVELOPING LIQUID BEING CAPABLE OF BEING ABSORBED BT THE SAID SILICONE RUBBER LAYER AND CAUSING UNIQUE SWELLING OF THE IMAGE AREAS OF SAID SILICONE RUBBER LAYER WHICH HAVE NOT BEEN BOUND TO SAID PHOTOADHESIVE LAYER. F. RUBBING SAID SILICONE RUBBER LAYER WITH DEVELOPING LIQUID TO REMOVE THE IMAGE AREAS OF SILICONE RUBBER LAYER NOT BOUND TO SAID PHOTOADHESIVE LAYER TO PROVIDE AN INKRECEPTIVE SURFACE IN THE IMAGE AREAS WHILE THE NON-IMAGE AREAS OF THE SILICONE RUBBER LAYER BOUND TO THE SAID PHOTOADHESIVE LAYER PROVIDE INK REPELLENT BACKGROUND AREAS.
Claim 11
Independent Claim
209 words
A METHOD OF PRODUCING A POSITIVE ACTING PRESENSITIZED DRY PLANOGRAPHIC PRINTING PLATE, SAID METHOD COMPRISING THE STEPS OF: A. PROVIDING A BASE LAYER HAVING SUFFICIENT STRENGTH TO WITHSTAND THE STRESS NORMALLY ENCOUNTERED IN A PRINTING PROCESS: B. APPLYING A PHOTOADHESIVE LAYER OVERLYING THE SAID ASE LAYER, SAID PHOTOADHESIVE LAYER BEING CAPABLE OF POLYMERIZING WHEN EXPOSED TO ACTINIC LIGHT: C. APPLYING A SILICONE RUBBER LAYER OVERLYING THE SAID PHOTOADHESIVE LAYER: D. EXPOSING SAID PHOTOADHESIVE LAYER TO ACITINIC LAIGHT THROUGH A POSITIVE TRANSPARENCY HAVING IMAGE AND NON-IMAGE AREAS AND THROUGH SAID SILICONE RUBBER LAYER TO POLYMERIZE THE NON-IMAGE AREAS OF SAID PHOTO ADHESVE LAYER AND BIND SAME TO SAID OVERLYING SILICONE RUBBER LAYER: E. APPLYING A DEVELOPING LIQUID TO SAID SILICONE RUBBER, SAID DEVELOPING LIQUID BEING CAPABLE OF BEING ABSORBED BT THE SAID SILICONE RUBBER LAYER AND CAUSING UNIQUE SWELLING OF THE IMAGE AREAS OF SAID SILICONE RUBBER LAYER WHICH HAVE NOT BEEN BOUND TO SAID PHOTOADHESIVE LAYER. F. RUBBING SAID SILICONE RUBBER LAYER WITH DEVELOPING LIQUID TO REMOVE THE IMAGE AREAS OF SILICONE RUBBER LAYER NOT BOUND TO SAID PHOTOADHESIVE LAYER TO PROVIDE AN INKRECEPTIVE SURFACE IN THE IMAGE AREAS WHILE THE NON-IMAGE AREAS OF THE SILICONE RUBBER LAYER BOUND TO THE SAID PHOTOADHESIVE LAYER PROVIDE INK REPELLENT BACKGROUND AREAS.
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) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |