US4238279A
Expired / Lapsed
US
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Compositions and methods for treating surface of lithographic printing plates
Assignee: Mitsubishi Paper Mills Ltd
•
Filing: 1978-09-20
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Granted: 1980-12-09
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Expires: 1998-09-20
Abstract
Abstract A liquid composition for treating surface of lithographic printing plates, especially etching liquid and dampening liquid which essentially consists of (a) phosphoric acids, (b) nitric acid or salts thereof and (c) nitrous acid or salts thereof and which has all characteristics required for treating liquids used for offset printing, has excellent ability of rendering the non-image areas oil-unreceptive and has rust resistance for all metals. This composition may additionally contain aminopolycarboxylates, polyol compounds and inorganic fine particles.
Inventors
- 👤 Yasuo Tsubai
- 👤 Toshiro Kondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:01
CPC Classifications
B; B41; B41N; B41N3/00; B41N3/08
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
37 words
A treating liquid composition for treating the surface of lithographic printing plates which essentially consists of (a) a phosphoric acid, (b) nitric acid or a salt thereof, (c) nitrous acid or a salt thereof and (d) aminopolycarboxylate.
Claim 2
Dependent Claim
37 words
A treating liquid composition for treating the surface of lithographic printing plates which essentially consists of (a) a phosphoric acid, (b) nitric acid or a salt thereof, (c) nitrous acid or a salt thereof and (d) aminopolycarboxylate.
Claim 3
Dependent Claim
14 words
A treating liquid composition according to claim 1 which additionally contains inorganic fine particles.
Claim 4
Dependent Claim
14 words
A treating liquid composition according to claim 1 which additionally contains a polyol compound.
Claim 5
Dependent Claim
47 words
A treating liquid composition according to claim 1 wherein the content of (a) is at least about 0.1 g/l, that of (b) is at least 0.1 g/l, that of (c) is at least about 0.01 g/l and that of (d) is about 0.01 g/l-to about 5 g/l.
Claim 6
Dependent Claim
20 words
A treating liquid composition according to claim 1 which additionally contains (e) a polyol compound and (f) inorganic fine particles.
Claim 7
Dependent Claim
32 words
A treating liquid composition according to claim 5 which consists essentially of (a) sodium o-phosphate, (b) sodium nitrate, (c) sodium nitrite, (d) aminopolycarboxylate, (e) a polyol compound and (f) inorganic fine particles.
Claim 8
Dependent Claim
60 words
A treating liquid composition according to claim 5 which consists essentially of (a) at least one member selected from o-phosphoric acid, pyrophosphoric acid, hexametaphosphate and phosphorous acid, (b) at least one of nitric acid and salts thereof, (c) at least one of nitrous acid and salts thereof, (d) aminopolycarboxylate, (e) at least one polyol compound and (f) inorganic fine particles.
Claim 9
Dependent Claim
27 words
A treating liquid composition according to claim 3 which additionally contains an alkali metal salt other then an alkali metal salt of nitrous acid or nitric acid.
Claim 10
Independent Claim
53 words
A method of treating the surface of a lithographic printing plate comprising applying to said surface: a treating liquid composition for treating the surface of lithographic printing plates which essentially consists of (a) a phosphoric acid, (b) nitric acid or a salt thereof, (c) nitrous acid or a salt thereof and (d) aminopolycarboxylate.
Claim 11
Independent Claim
53 words
A method of treating the surface of a lithographic printing plate comprising applying to said surface: a treating liquid composition for treating the surface of lithographic printing plates which essentially consists of (a) a phosphoric acid, (b) nitric acid or a salt thereof, (c) nitrous acid or a salt thereof and (d) aminopolycarboxylate.
Claim 12
Dependent Claim
16 words
A method according to claim 9 wherein the treating liquid composition additionally contains inorganic fine particles.
Claim 13
Dependent Claim
16 words
A method according to claim 9 wherein the treating liquid composition additionally contains a polyol compound.
Claim 14
Dependent Claim
48 words
A method according to claim 9 wherein the treating liquid composition content of (a) is at least about 0.1 g/l, that of (b) is at least about 0.01 g/l, that of (c) is at least about 0.01 g/l and that of (d) is about 0.01 g/l-about 5 g/l.
Claim 15
Dependent Claim
22 words
A method according to claim 9 wherein the treating liquid composition additionally contains (e) a polyol compound and (f) inorganic fine particles.
Claim 16
Dependent Claim
34 words
A method according to claim 13 wherein the treating liquid composition consists essentially of (a) sodium o-phosphate, (b) sodium nitrate, (c) sodium nitrite, (d) aminopolycarboxylate, (e) a polyol compound and (f) inorganic fine particles.
Claim 17
Dependent Claim
62 words
A method according to claim 13 wherein the treating liquid composition consists essentially of (a) at least one member selected from o-phosphate acid, pyrophosphoric acid, hexametaphosphate and phosphorous acid, (b) at least one of nitric acid and salts thereof, (c) at least one of nitrous acid and salts thereof, (d) aminopolycarboxylate, (e) at least one polyol compound and (f) inorganic fine particles.
Claim 18
Dependent Claim
29 words
A method according to claim 13 wherein the treating liquid composition additionally contains an alkali metal salt other than an alkali metal salt of nitrous acid or nitric acid.
Claim 19
Dependent Claim
13 words
A method according to claim 7 wherein the aminopolycarboxylate is sodium ethylenediamine tetraacetate.
Claim 20
Dependent Claim
14 words
A treating liquid according to claim 1 wherein the aminopolycarboxylate is sodium ethylenediamine tetraacetate.
References Cited (Backward Citations)
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Cited
US2393875A
Cited
US2705191A
Cited
US3575747A
Cited
US3645790A
Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-09 | 1984-06-09 | 1984-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-09 | 1988-06-09 | 1988-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-09 | 1992-06-09 | 1992-12-09 | $7700.00 | Window Closed / Lapsed |