US3615448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lithographic printing plate and method of preparation
Assignee: WR Grace and Co
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Filing: 1969-01-14
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Granted: 1971-10-26
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Expires: 1989-01-14
Abstract
Abstract A lithographic (planographic) printing plate is prepared from an element comprising a layer of a photocurable composition containing finely divided particles of a vinyl plastic. The layer is exposed imagewise to U.V. radiation, which photocures the photocurable composition, and then is uniformly heat fluxed, whereby the photocurable composition plasticizes the plastic vinyl in the nonexposed areas. The imagewise exposure is through a stencil, or a negative or positive transparency (halftone or line.) The exposed areas are either oleophilic or hydrophilic in relation to the nonexposed areas. The homopolymer of vinyl chloride is the preferred vinyl plastic.
Inventors
- 👤 Leon Yeshin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:57
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/027; G03F7/0275; G03F7/038; G03F7/26; G03F7/36; G03F7/40; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/106; Y10S430/11; Y10S430/111; Y10S430/113
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
45 words
A process as described in claim 1 wherein said photocurable composition, which is part of said photocurable layer has a viscosity before mixture with the vinyl plastic of between about 0.25 poise and about 350 poises at a temperature not greater than about 70* C.
Claim 2
Dependent Claim
49 words
about 98 to 2 parts by weight of a polythiol containing at least two thiol groups per molecule, the total combined functionality of the reactive unsaturated carbon to carbon bonds per molecule in the polyene and the thiol groups per molecule in the polythiol being greater than 4, and
Claim 3
Dependent Claim
49 words
about 98 to 2 parts by weight of a polythiol containing at least two thiol groups per molecule, the total combined functionality of the reactive unsaturated carbon to carbon bonds per molecule in the polyene and the thiol groups per molecule in the polythiol being greater than 4, and
Claim 4
Dependent Claim
48 words
about 98 to 2 parts by weight of a polythiol containing at least two thiol groups per molecule, the total combined functionality of the reactive unsaturated carbon to carbon bonds per molecule in the polyene and the thiol groups per molecule in the polythiol being greater than 4,
Claim 5
Dependent Claim
35 words
about 0.0005 to 50 parts by weight based on 100 parts by weight of (1) and (2) of a photocuring rate accelerator said unexposed area being hydrophilic or oleophilic in relation to said exposed area.
Claim 6
Dependent Claim
22 words
about 0.0005 to 50 parts by weight based on 100 parts by weight of (1) and (2) of a photocuring rate accelerator.
Claim 7
Dependent Claim
118 words
about 0.0005 to 50 parts by weight based on 100 parts by weight of (1) and (2) of a photocuring rate accelerator, said process comprising: a. exposing imagewise, through a stencil, or halftone or line negative transparency, or halftone or line positive transparency, said photocurable layer to ultraviolet radiation, whereby the exposed area of the photocurable layer is cured; b. heating said photocurable layer until the vinyl plastic in the unexposed area is plasticized and c. cooling said photocurAble layer to obtain a solid plasticized vinyl compound in the unexposed area and a cured polythioether containing vinyl plastic in particulate form in the exposed area, said unexposed area being hydrophilic or oleophilic in relation to said exposed area.
Claim 8
Dependent Claim
32 words
A process as described in claim 1 wherein said polythiol has a molecular weight between about 50 and about 20,000, and has a viscosity between slightly above 0 and about 20,000,000 centipoises.
Claim 9
Dependent Claim
26 words
A process as described in claim 1 wherein said vinyl plastic in particulate form has an average particle size between about 0.01 and about 2,000 microns.
Claim 10
Dependent Claim
41 words
A process as described in claim 1 wherein, after said heating step, said exposed areas of the photocurable layer are oleophilic and said unexposed areas of said photocurable layer are oleophilic and said unexposed areas of said photocurable layer are hydrophilic.
Claim 11
Dependent Claim
19 words
A process as described in claim 5 wherein said support layer is comprised of a solid, synthetic, polymeric sheet.
Claim 12
Dependent Claim
15 words
A process as described in claim 5 wherein said support layer comprises an aluminum layer.
Claim 13
Dependent Claim
16 words
A process as described in claim 5 wherein said support layer comprises a curved aluminum layer.
Claim 14
Dependent Claim
23 words
A process as described in claim 5 wherein the thickness of the photocurable layer ranges between about 0.01 mil and about 30 mils.
Claim 15
Dependent Claim
23 words
A process as described in claim 5 wherein the photocuring is achieved at a temperature between about 20* C. and about 70* C.
Claim 16
Dependent Claim
37 words
A process as described in claim 5 wherein the vinyl plastic incorporated in said photocurable layer is the homopolymer of a monomer or copolymer of one or more monomers, each of said monomers containing a vinyl grouping.
Claim 17
Dependent Claim
39 words
A process as described in claim 11 wherein the vinyl plastic is derived from an addition polymerizable vinyl monomer having vinyl groups selected from the group consisting of a terminal vinyl group, a vinylidene group and a transoleofinic group.
Claim 18
Dependent Claim
17 words
A process as described in claim 5 wherein the plastic vinyl is the homopolymer of vinyl chloride.
Claim 19
Dependent Claim
19 words
A process as described in claim 5 wherein the plastic is a copolymer of vinyl chloride and vinyl acetate.
Claim 20
Dependent Claim
20 words
A process as described in claim 5 wherein the vinyl plastic is a copolymer of vinyl chloride with vinylidene chloride.
Claim 21
Dependent Claim
23 words
A process as described in claim 5 wherein the heating is conducted at a temperature between about 200* F. and about 500* F.
Claim 22
Dependent Claim
25 words
A process as described in claim 5 wherein the heating is conducted for a period of time between about 15 seconds and about 15 minutes.
Claim 23
Dependent Claim
107 words
A process as described in claim 1 wherein said polyene has a molecular weight in the range of 50 to 20,000; has a viscosity ranging from 0 to 20,000,000 centipoises at 70* C., and has the general formula (a) (X)m wherein X is a member of the group consisting of and R-C C-; m is an integer of at least 2; R is independently selected from the group consisting of hydrogen, halogen, aryl, substituted aryl, aralkyl, substituted aralkyl, cycloalkyl, substituted cycloalkyl, alkyl and substituted alkyl groups containing 1 to 16 carbon atoms; and A is a polyvalent polymeric organic moiety free of reactive carbon to carbon unsaturation.
Claim 24
Dependent Claim
18 words
A process as described in claim 18 wherein the polyene has a molecular weight in excess of 300.
Claim 25
Dependent Claim
35 words
A process as described in claim 18 wherein the at least two, unsaturated carbon to carbon bonds in the polyene are located at the end of or pendant to the main chain of the molecule.
Claim 26
Dependent Claim
46 words
A proceSs as described in claim 18 wherein the at least two, unsaturated carbon to carbon bonds in the polyene are located within the main chain of the molecule not more than 16 carbon atoms away from an end of the main chain in the molecule.
Claim 27
Dependent Claim
53 words
A photocurable element having a a. support layer and a photocurable layer thereon consisting essentially of an admixture of 33-900 parts by weight, based on 100 parts by weight of photocurable composition, of a vinyl plastic in particulate form derived from an addition polymerizable vinyl monomer, in a photocurable composition consisting essentially of
Claim 28
Dependent Claim
48 words
A lithographic printing plate comprising a support layer, a printing layer thereon comprising an exposed area consisting essentially of a solid photocured polythioether containing solid vinyl plastic in particulate form therein and an unexposed area consisting essentially of vinyl compound plasticized with a photocurable composition consisting essentially of
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |