US4511646A
Expired / Lapsed
US
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Ethylenically-unsaturated dextrin composition for preparing a durable hydrophilic photopolymer
Assignee: Kodak Graphics Holding Inc
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Filing: 1983-03-03
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Granted: 1985-04-16
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Expires: 2003-03-03
Abstract
Abstract A water-soluble photopolymerizable composition which is suitable for forming the hydrophilic layer in a positive acting water-developable lithographic printing plate. The photopolymerizable composition comprises a mixture of: (a) an ethylenically-unsaturated dextrin oligomer, (b) at least one hydroxyfunctional acrylamide monomer, (c) inorganic solid particulate material, and (d) a photoinitiation system. Wetting agents and pH modifiers can also be added to the composition. The photopolymer formed from the composition is water-insoluble.
Inventors
- 👤 Elsie A. Fohrenkamm
- 👤 Alan D. Rousseau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:39
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/027; G03F7/032; B; B41; B41N; B41N1/00; B41N1/12; B41N1/14; C; C08; C08F; C08F251/00; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/114; Y10S430/117
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
55 words
A photosensitive composition capable of providing a cross-linked hydrophilic photopolymer comprising (a) an ethylenically unsaturated dextrin oligomer having a degree of substitution of about 0.20 to about 0.45, (b) at least one hydroxyfunctional acrylamide monomer, (c) inorganic solid particulate material, and (d) a photoinitiation system, said composition, upon undergoing photopolymerization, forming a cross-linked hydrophilic photopolymer.
Claim 2
Dependent Claim
55 words
A photosensitive composition capable of providing a cross-linked hydrophilic photopolymer comprising (a) an ethylenically unsaturated dextrin oligomer having a degree of substitution of about 0.20 to about 0.45, (b) at least one hydroxyfunctional acrylamide monomer, (c) inorganic solid particulate material, and (d) a photoinitiation system, said composition, upon undergoing photopolymerization, forming a cross-linked hydrophilic photopolymer.
Claim 3
Dependent Claim
83 words
The composition of claim 1 wherein the dextrin oligomer has the formula ##STR18## wherein "Dextrin" is a carbohydrate intermediate in chain length between starch and glucose, Z is an organo linking group having up to 9 atoms selected from carbon, nitrogen, and oxygen, "a" represents the degree of substitution and has a value of 0.20 to 0.45, and R is a member selected from the group consisting of hydrogen and lower alkyl radicals, wherein said radicals have from 1 to 4 carbon atoms.
Claim 4
Dependent Claim
15 words
The composition of claim 2 wherein Z is selected from the group consisting of ##STR19##
Claim 5
Dependent Claim
24 words
The composition of claim 1 wherein the hydroxyfunctional monomer is a mixture of at least one monoacrylamide monomer and at least one polyacrylamide monomer.
Claim 6
Dependent Claim
12 words
The composition of claim 4 wherein the monomers are 2,3-dihydroxy-1-acrylamidopropane and 1,3-diacrylamide-2-hydroxypropane.
Claim 7
Dependent Claim
14 words
The composition of claim 1 wherein the inorganic solid particulate material is silica gel.
Claim 8
Dependent Claim
21 words
The composition of claim 1 wherein the photoinitiation system comprises: (a) a water soluble Michler's ketone analog (b) a diaryliodonium salt.
Claim 9
Dependent Claim
11 words
The composition of claim 1 and further including a wetting agent.
Claim 10
Dependent Claim
11 words
The composition of claim 8 and further including a pH modifier.
Claim 11
Dependent Claim
54 words
The composition of claim 1 comprising from about 20 to about 60 parts of an ethylenically unsaturated dextrin oligomer, from about 10 to about 30 parts of at least one hydroxyfunctional acrylamide monomer, from about 10 to about 40 parts of an inorganic filler, from about 1 part to about 7 parts photoinitiation system.
Claim 12
Dependent Claim
17 words
A polymer prepared by exposing the composition of claim 1 to an effective amount of actinic radiation.
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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) | 1988-04-15 | 1988-10-15 | 1989-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-15 | 1992-10-15 | 1993-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-15 | 1996-10-15 | 1997-04-16 | $7700.00 | Window Closed / Lapsed |