Patent US1587274A successfully refreshed from Google Patents.
US4276367A
Expired / Lapsed
US
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Method of preparing lithographic printing plates using novel compounds and compositions, and improved lithographic printing plates
Assignee: Arthur D Little Inc
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Filing: 1979-12-26
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Granted: 1981-06-30
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Expires: 1999-12-26
Abstract
Abstract A lithographic printing plate in which the oleophilic imaging areas are formed as a thin cross-linked block copolymer film adhered to the hydrophilic surface of a backing plate. The block copolymer comprises blocks of copolyacrylate and polyurethane wherein the copolyacrylate blocks are a copolymer of a hydroxy-containing acrylate and a second acrylate component comprising one or more esters of acrylic acid or methacrylic acid or mixtures thereof and the polyurethane blocks are formed of polyoxybutylene as the prepolymer component. In forming the printing plate the block copolymer is deposited as a thin film containing an ultraviolet initiator and a cross linking promoter and the cross-linked imaging areas are formed by exposure to ultraviolet radiation.
Inventors
- 👤 Richard E. Merrill
- 👤 Arthur A. Massucco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:18
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/027; G03F7/032; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/128
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
112 words
A presensitized photolithographic plate, comprising in combination (a) a backing plate having a hydrophilic/oleophobic surface; and (b) a photosensitive cross-linkable polymeric film adhered to said hydrophilic surface, said film being no greater than 6μ thick and comprising (1) a block copolymer formed of blocks of copolyacrylate and polyurethane, said copolyacrylate comprising a copolymer of a hydroxy-containing acrylate and a second acrylate component which comprises one or more esters of a non hydroxy-containing arylic acid or methacrylic acid or mixtures thereof, and said polyurethane being formed by reacting a diisocyanate with polyoxybutylene to form a "diisocyanate-capped" prepolymer constituent of the said polyurethane; (2) an ultraviolet initiator, and (3) at least one cross-linking promoter.
Claim 2
Dependent Claim
112 words
A presensitized photolithographic plate, comprising in combination (a) a backing plate having a hydrophilic/oleophobic surface; and (b) a photosensitive cross-linkable polymeric film adhered to said hydrophilic surface, said film being no greater than 6μ thick and comprising (1) a block copolymer formed of blocks of copolyacrylate and polyurethane, said copolyacrylate comprising a copolymer of a hydroxy-containing acrylate and a second acrylate component which comprises one or more esters of a non hydroxy-containing arylic acid or methacrylic acid or mixtures thereof, and said polyurethane being formed by reacting a diisocyanate with polyoxybutylene to form a "diisocyanate-capped" prepolymer constituent of the said polyurethane; (2) an ultraviolet initiator, and (3) at least one cross-linking promoter.
Claim 3
Dependent Claim
25 words
A presensitized photolithographic plate in accordance with claim 1 wherein said hydroxy-containing acrylate is 2-hydroxyethyl acrylate, a hydroxypropyl acrylate, 2-hydroxyethyl methacrylate or a hydroxypropyl methacrylate.
Claim 4
Dependent Claim
27 words
A presensitized photolithgraphic plate in accordance with claim 1 wherein said polyoxybutylene has a molecular weight of about 2000 and said polyurethane blocks contain a chain extender.
Claim 5
Dependent Claim
19 words
A presensitized photolithographic plate in accordance with claim 1 wherein said second acrylate component is partially substituted with bromine.
Claim 6
Dependent Claim
29 words
A presensitized photolithographic plate in accordance with claim 1 wherein said ultraviolet initiator is phenanthrenequinone in a concentration from about 0.01% to about 5% by total block copolymer weight.
Claim 7
Dependent Claim
35 words
A presensitized photolithographic plate in accordance with claim 1 wherein said at least one cross-linking promoter is a multifunctional olefin cross-linking agent present in an amount up to about 20% by total block copolymer weight.
Claim 8
Dependent Claim
17 words
A presensitized photolithographic plate in accordance with claim 1 wherein said backing plate comprises a metal sheet.
Claim 9
Dependent Claim
14 words
A presensitized photolithographic plate in accordance with claim 7 wherein said metal comprises aluminum.
Claim 10
Dependent Claim
148 words
A lithographic printing plate, comprising in combination (a) a backing plate having a hydrophilic surface; and (b) printing ink-adhering, oleophilic image areas firmly adhered to said hydrophilic surface in the form of a cross-linked copolyacrylate/polyurethane block copolymer thin film, said copolyacrylate comprising a copolymer of a hydroxy-containing acrylate and a second acrylate component which comprises one or more esters of a non hydroxy-containing acrylic acid or methacrylic acid or mixture thereof and the polyurethane being formed by reacting a diisocyanate with polyoxybutylene to form a "diisocyanate-capped" prepolymer constituent of the said polyurethane, said film defining said image areas being formed by applying a liquid coating composition containing said block copolymer to said backing plate to form thereon a cross-linkable film, cross-linking said cross-linkable film in the areas corresponding to said desired image areas and then removing the noncross-linked film thereby to expose said hydrophilic surface in nonimage areas.
Claim 11
Dependent Claim
148 words
A lithographic printing plate, comprising in combination (a) a backing plate having a hydrophilic surface; and (b) printing ink-adhering, oleophilic image areas firmly adhered to said hydrophilic surface in the form of a cross-linked copolyacrylate/polyurethane block copolymer thin film, said copolyacrylate comprising a copolymer of a hydroxy-containing acrylate and a second acrylate component which comprises one or more esters of a non hydroxy-containing acrylic acid or methacrylic acid or mixture thereof and the polyurethane being formed by reacting a diisocyanate with polyoxybutylene to form a "diisocyanate-capped" prepolymer constituent of the said polyurethane, said film defining said image areas being formed by applying a liquid coating composition containing said block copolymer to said backing plate to form thereon a cross-linkable film, cross-linking said cross-linkable film in the areas corresponding to said desired image areas and then removing the noncross-linked film thereby to expose said hydrophilic surface in nonimage areas.
Claim 12
Dependent Claim
25 words
A lithographic printing plate in accordance with claim 9 wherein said hydroxy-containing acrylate is 2-hydroxyethyl acrylate, a hydroxypropyl acrylate, 2-hydroxyethyl methacrylate or a hydroxypropyl methacrylate.
Claim 13
Dependent Claim
27 words
A lithographic printing plate in accordance with claim 9 wherein said polyoxybutylene has a molecular weight of about 2000 and said polyurethane blocks contain a chain extender.
Claim 14
Dependent Claim
19 words
A lithographic printing plate in accordance with claim 9 wherein said second acrylate component is partially substituted with bromine.
Claim 15
Dependent Claim
17 words
A lithographic printing plate in accordance with claim 9 wherein said backing plate comprises a metal sheet.
Claim 16
Dependent Claim
14 words
A lithographic printing plate in accordance with claim 13 wherein said metal comprises aluminum.
Claim 17
Independent Claim
191 words
A method of preparing a lithographic printing plate, comprising the steps of (a) affixing to the hydrophilic surface of a backing plate a coating composition comprising (1) a block copolymer formed of blocks of a copolyacrylate and a polyurethane, said copolyacrylate comprising a copolymer of a hydroxy-containing acrylate and a second acrylate component which comprises one or more esters of a non hydroxy-containing acrylic acid or methacrylic acid or mixtures thereof and said polyurethane being formed by reacting a diisocyanate with polyoxybutylene to form a "diisocyanate-capped" prepolymer constituent of the said polyurethane, (2) a solvent for said block copolymer, (3) an ultraviolet initiator, (4) at least one cross-linking promoter, and (5) a wetting/adhesion promoting agent; (b) producing in said coating oleophilic imaging areas by exposing said film on said backing plate to ultraviolet radiation through a master defining said imaging areas as a transparent pattern to cross-link said film in areas corresponding to said transparent pattern; and (c) forming a lithographic printing plate by removing from said backing plate that portion of said coating which is not cross-linked by exposure to ultraviolet radiation thereby exposing said hydrophilic surface as nonimaging areas.
Claim 18
Independent Claim
191 words
A method of preparing a lithographic printing plate, comprising the steps of (a) affixing to the hydrophilic surface of a backing plate a coating composition comprising (1) a block copolymer formed of blocks of a copolyacrylate and a polyurethane, said copolyacrylate comprising a copolymer of a hydroxy-containing acrylate and a second acrylate component which comprises one or more esters of a non hydroxy-containing acrylic acid or methacrylic acid or mixtures thereof and said polyurethane being formed by reacting a diisocyanate with polyoxybutylene to form a "diisocyanate-capped" prepolymer constituent of the said polyurethane, (2) a solvent for said block copolymer, (3) an ultraviolet initiator, (4) at least one cross-linking promoter, and (5) a wetting/adhesion promoting agent; (b) producing in said coating oleophilic imaging areas by exposing said film on said backing plate to ultraviolet radiation through a master defining said imaging areas as a transparent pattern to cross-link said film in areas corresponding to said transparent pattern; and (c) forming a lithographic printing plate by removing from said backing plate that portion of said coating which is not cross-linked by exposure to ultraviolet radiation thereby exposing said hydrophilic surface as nonimaging areas.
Claim 19
Dependent Claim
57 words
A method in accordance with claim 15 wherein said coating composition comprises from about 5 to about 10 weight percent of said block copolymer and has a viscosity no greater than that which permits said affixing to be accomplished by flow-coating said composition onto said surface to form said film no greater than about 6μ in thickness.
Claim 20
Dependent Claim
28 words
A method in accordance with claim 15 wherein said step of affixing said film comprises roll coating, flow coating, swirl coating or spraying said composition onto said surface.
Claim 21
Dependent Claim
18 words
A method in accordance with claim 15 wherein said step of affixing said film comprises wiping it on.
Claim 22
Dependent Claim
23 words
A method in accordance with claim 15 wherein said hydroxy-containing acrylate is 2-hydroxyethyl acrylate, a hydroxypropyl acrylate, 2-hydroxyethyl methacrylate or a hydroxypropyl methacrylate.
Claim 23
Dependent Claim
25 words
A method in accordance with claim 15 wherein said polyoxybutylene has a molecular weight of about 2000 and said polyurethane blocks contain a chain extender.
Claim 24
Dependent Claim
17 words
A method in accordance with claim 15 wherein said second acrylate component is partially substituted with bromine.
Claim 25
Dependent Claim
15 words
A method in accordance with claim 15 wherein said backing plate comprises a metal sheet.
Claim 26
Dependent Claim
12 words
A method in accordance with claim 15 wherein said metal comprises aluminum.
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) | 1984-06-29 | 1984-12-29 | 1985-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-29 | 1988-12-29 | 1989-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-29 | 1992-12-29 | 1993-06-30 | $7700.00 | Window Closed / Lapsed |