Patent US3635709A successfully refreshed from Google Patents.
US3635709A
Expired / Lapsed
US
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Light-sensitive lithographic plate
Assignee: Polychrome Corp
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Filing: 1969-06-05
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Granted: 1972-01-18
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Expires: 1989-06-05
Abstract
Abstract Light-sensitive compositions and positive-acting lithographic printing plates made therewith comprising an ester of 2-diazo-1naphthol-4(or -5)-sulfonic acid with a polyhydroxy-phenyl that is a condensation product of acetone and pyrogallol.
Inventors
- 👤 Kesanao Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:19
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/022; G03F7/023; C; C08; C08G; C08G8/00; C08G8/02; C08G8/28
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
20 words
A resin according to claim 1 wherein said polyhydroxy-phenol condensation product is formed in the presence of a polymerization catalyst.
Claim 2
Dependent Claim
21 words
A resin according to claim 2 wherein said catalyst is phosphorus oxychloride and the condensation is conducted at about room temperature.
Claim 3
Dependent Claim
21 words
A resin according to claim 1 wherein said condensation product has a molecular weight between about 1,000 and about 1, 800.
Claim 4
Dependent Claim
16 words
A resin according to claim 1 wherein said ester reaction product is based on 2-diazo-1-naphthol-4-sulfonic acid.
Claim 5
Dependent Claim
16 words
A resin according to claim 1 wherein said ester reaction product is based on 2-diazo-1-naphthol-5-sulfonic acid.
Claim 6
Dependent Claim
27 words
A resin according to claim 1 wherein said sulfonic acid and said condensation product are in a ratio of about 1:0.6 to about 1:2 parts by weight.
Claim 7
Dependent Claim
41 words
A light-sensitive positive-acting lithographic printing plate which comprises a support and a coating on said support containing a light-sensitive resin that is an ester reaction product of 2-diazo-1-naphthol-4-sulfonic acid or 2-diazo-1-naphthol-5-sulfonic acid with a polyhydroxy-phenol condensation product of pyrogallol and acetone.
Claim 8
Dependent Claim
20 words
A plate according to claim 8 wherein said polyhydroxy-phenol condensation product is formed in the presence of a polymerization catalyst.
Claim 9
Dependent Claim
21 words
A plate according to claim 9 wherein said catalyst is phosphorus oxychloride and the condensation is conducted at about room temperature.
Claim 10
Dependent Claim
21 words
A plate according to claim 8 wherein said condensation product has a molecular weight between about 1,000 and about 1, 800.
Claim 11
Dependent Claim
16 words
A plate according to claim 8 wherein said ester reaction product is based on 2-diazo-1-naphthol-4-sulfonic acid.
Claim 12
Dependent Claim
16 words
A plate according to claim 8 wherein said ester reaction product is base on 2-diazo-1-naphthol-5-sulfonic acid.
Claim 13
Dependent Claim
24 words
A plate according to claim 8 wherein the amount of said coating on said support is from about 50 to about 3,000 mg./sq. m.
Claim 14
Dependent Claim
24 words
A plate according to claim 8 wherein the amount of said coating on said support is from about 500 to about 700 mg./sq. m.
Claim 15
Dependent Claim
27 words
A plate according to claim 8 wherein said sulfonic acid and said condensation product are in a ratio of about 1:0.6 to about 1:2 parts by weight.
Claim 16
Independent Claim
66 words
A method of making a lithographic printing plate which comprises: coating a support with a film of light-sensitive resin containing an ester reaction product of 2-diazo-1-naphthol-4-sulfonic acid or 2-diazo-1-naphthol-5-sulfonic acid with a polyhydroxy-phenol condensation product of pyrogallol and acetone; exposing the coated support to light through an image transparency; and removing light-exposed portions of said film of resin by preferential dissolution thereof in An aqueous medium.
Claim 17
Dependent Claim
18 words
A method according to claim 17 wherein said aqueous medium is a solution of trisodium phosphate in water.
References Cited (Backward Citations)
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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) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |