US4367124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing lithographic printing plate bases
Assignee: Mitsubishi Chemical Corp
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Filing: 1981-07-02
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Granted: 1983-01-04
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Expires: 2001-07-02
Abstract
Abstract There is disclosed a process for preparing lithographic printing plate bases, which comprises electrolytically etching a sheet made of aluminum or an aluminum alloy in an electrolytic solution containing hydrochloric acid and a β-dicarbonyl compound.
Inventors
- 👤 Nobuji Kikuchi
- 👤 Yoshiyuki Kisaka
- 👤 Kazuo Torige
- 👤 Masayuki Onose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:14
CPC Classifications
C; C25; C25F; C25F3/00; C25F3/02; C25F3/04; B; B41; B41N; B41N3/00; B41N3/03; B41N3/034; Y; Y10; Y10S; Y10S205/00; Y10S205/921
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
44 words
A process for preparing lithographic printing plate bases, which comprises electrolytically etching a sheet made of aluminum or an aluminum alloy in an electrolytic solution containing sufficient amount of hydrochloric acid and a β-dicarbonyl compound to produce grains suitable for use as printing plates.
Claim 2
Dependent Claim
44 words
A process for preparing lithographic printing plate bases, which comprises electrolytically etching a sheet made of aluminum or an aluminum alloy in an electrolytic solution containing sufficient amount of hydrochloric acid and a β-dicarbonyl compound to produce grains suitable for use as printing plates.
Claim 3
Dependent Claim
25 words
The process according to claim 1, wherein the electrolytic solution contains 3.5 to 35 g/l of hydrochloric acid and 0.01-20 g/l of a β-dicarbonyl compound.
Claim 4
Dependent Claim
25 words
The process according to claim 2, wherein the electrolytic solution contains 3.5 to 35 g/l of hydrochloric acid and 0.1-10 g/l of a β-dicarbonyl compound.
Claim 5
Dependent Claim
19 words
The process according to claim 1, wherein the β-dicarbonyl compound is acetylacetone, methyl acetoacetate, ethyl acetoacetate or ethyl malonate.
Claim 6
Dependent Claim
12 words
The process according to claim 4, wherein the β-dicarbonyl compound is acetylacetone.
Claim 7
Dependent Claim
19 words
The process according to claim 1, wherein the bath temperature is in the range of 10° to 40° C.
Claim 8
Dependent Claim
23 words
The process according to claim 1, wherein the sheet is electrolytically etched at a current density of 20 to 200 A/dm 2 .
Claim 9
Dependent Claim
68 words
A process for preparing lithographic printing plate bases, which comprises electrolytically etching a sheet made of aluminum or an aluminum alloy in an electrolytic solution containing about 3.5 to 35 g/l of hydrochloric acid and about 0.01 to 20 g/l of a β-dicarbonyl compound at a bath temperature of 10° to 40° C., and anodizing the sheet in an aqueous electrolytic solution containing sulfuric acid or phosphoric acid.
Claim 10
Dependent Claim
68 words
A process for preparing lithographic printing plate bases, which comprises electrolytically etching a sheet made of aluminum or an aluminum alloy in an electrolytic solution containing about 3.5 to 35 g/l of hydrochloric acid and about 0.01 to 20 g/l of a β-dicarbonyl compound at a bath temperature of 10° to 40° C., and anodizing the sheet in an aqueous electrolytic solution containing sulfuric acid or phosphoric acid.
Claim 11
Dependent Claim
23 words
The process according to claim 8, wherein the etched sheet is anodized at a current density of 1 to 10 A/dm 2 .
Claim 12
Dependent Claim
23 words
The process according to claim 8, wherein the concentration of sulfuric acid or phosphoric acid is in the range of 10 to 50%.
References Cited (Backward Citations)
US4052275A
Cited
US4172772A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-03 | 1986-07-05 | 1987-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-03 | 1990-07-05 | 1991-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-03 | 1994-07-05 | 1995-01-04 | $7700.00 | Window Closed / Lapsed |