US4282301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photosensitive diazo coating compositions and plates
Assignee: Okamoto Chemical Industry Co Ltd
•
Filing: 1979-07-03
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Granted: 1981-08-04
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Expires: 1999-07-03
Abstract
Abstract A photosensitive coating composition for printing plate comprises a mixture containing a copolymer, prepared by polymerizing from 10 to 70% by weight of a monomer (A) having the general formula: ##STR1## in which R 1 and R 2 are hydrogen atoms or alkyl groups having 1 or 2 carbon atoms, with from 90 to 30% by weight of at least one monomer (B) selected from the group consisting of methyl methacrylate, methacrylic acid, acrylonitrile, and 2-hydroxyethyl methacrylate together with a diazo resin; and, optionally, a dye; a pigment; and/or other additives.
Inventors
- 👤 Takatoshi Ohta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:01
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/016; G03F7/021; G03F7/0212
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
109 words
A photosensitive coating composition for negative printing plates, comprising a mixture containing from 50% to 95% by weight of a copolymer, prepared by polymerizing from 10 to 70% by weight of a monomer (A) having the general formula: ##STR3## in which R 1 and R 2 are hydrogen atoms or alkyl groups having 1 or 2 carbon atoms, with from 30 to 90% by weight of at least one monomer (B) selected from the group consisting of methyl methacrylate, methacrylic acid, acrylonitrile, and 2-hydroxylethyl methacrylate; in admixture with from 5% to 50% by weight of a diazo resin which is a condensation product of a diazoarylamine and an aldehyde.
Claim 2
Dependent Claim
109 words
A photosensitive coating composition for negative printing plates, comprising a mixture containing from 50% to 95% by weight of a copolymer, prepared by polymerizing from 10 to 70% by weight of a monomer (A) having the general formula: ##STR3## in which R 1 and R 2 are hydrogen atoms or alkyl groups having 1 or 2 carbon atoms, with from 30 to 90% by weight of at least one monomer (B) selected from the group consisting of methyl methacrylate, methacrylic acid, acrylonitrile, and 2-hydroxylethyl methacrylate; in admixture with from 5% to 50% by weight of a diazo resin which is a condensation product of a diazoarylamine and an aldehyde.
Claim 3
Dependent Claim
19 words
A photosensitive coating composition of claim 1 additionally containing up to 40% by weight of a dye or pigment.
Claim 4
Dependent Claim
32 words
A photosensitive coating composition of claim 1, in which said monomer (A) is at least one monomer selected from the group consisting of 2-hydroxy-3-phenoxypropyl acrylate, 2-hydroxy-3-phenoxy-propyl methacrylate, 2-hydroxy-3-methylphenoxypropyl acrylate, and 2-hydroxy-3-methylphenoxypropyl methacrylate.
Claim 5
Dependent Claim
31 words
A photosensitive coating composition of claim 1, in which the viscosity of the copolymer is from 100 to 1000 c.p.s. measured in a 20 wt% 2-methoxy ethanol solution at 25° C.
Claim 6
Dependent Claim
42 words
A photosensitive coating composition of claim 1, in which said diazo resin is at least one condensation product selected from the group consisting of the condensation products of 4-diazodiphenylamine or 4-diazo-3-methoxydiphenylamine and formaldehyde, paraformaldehyde, or acetaldehyde, coupled with an organic sulfonic acid.
Claim 7
Dependent Claim
36 words
A coating composition of claim 5, in which said organic sulfonic acid is at least one of the acids selected from the group consisting of p-toulenesulfonic acid, dodecylbenzenesulfonic acid, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid, 5-sulfosalicylic acid, and 5-sulfocresotic acid.
Claim 8
Dependent Claim
35 words
A photosensitive plate comprising a photosensitive coating composition as defined in claim 1, 2, 3, 4, 5 or 6 applied to a base plate uniformly in amounts of 0.85 g/m 2 -2.5 g/m 2 .
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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) | 1984-08-03 | 1985-02-02 | 1985-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-03 | 1989-02-02 | 1989-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-03 | 1993-02-02 | 1993-08-04 | $7700.00 | Window Closed / Lapsed |