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US3755116A
Expired / Lapsed
US
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Process for the production of aluminum base offset printing plates
Assignee: Sumitomo Light Metal Industries Ltd
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Filing: 1972-04-05
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Granted: 1973-08-28
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Expires: 1992-04-05
Abstract
Abstract This invention relates to a process of producing an aluminum base offset printing plate including a step wherein the surface of an aluminum base sheet is roughened or grained electrolytically by treating with alternating electric current at a current density of a selected range in an aqueous electrolyte containing hydrogen chloride as the primary etching agent and in the presence of one or more anti-corrosive agents chosen from some selected primary alkyl amine, secondary alkyl amines and tertiary alkyl amines, either un-substituted or substituted by carboxyl or hydroxyl on the alkyl group(s), alkylene diamines, alkyl aldehydes, alkanoic acid amides, urea, chromic acid and known ionic surface-active agents. The presence of the anticorrosive agent results in an improved uniformity of the grain particle size and prevents the dark colored aluminum smutt from depositing on the grained surface. The electrolytically graining treatment may continuously be performed with a continuous aluminum strip when an electrolytic cell of a particular arrangement as shown in the accompanying drawings is employed and when the treatment is effected in the presence of a mono-alkanol amine, di-alkanol amine, tri-alkanol amine or non-ionic surface active agent derived from polyethylene-glycol as the anticorrosive agent under particularly more favorable etching conditions.
Inventors
- 👤 Y Hayashi
- 👤 S Terai
- 👤 T Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:44
CPC Classifications
C; C25; C25F; C25F3/00; C25F3/02; C25F3/04
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
20 words
A process as claimed in claim 1 in which the electrolyte employed contains at least one mono-amine of the formula
Claim 2
Dependent Claim
31 words
A process as claimed in claim 1 in which the electrolyte employed contains at least one di-amine of the formula H2N-R-NH2 as defined in the claim 1 for the anti-corrosive agent.
Claim 3
Dependent Claim
32 words
A process as claimed in claim 1 in which the electolyte employed contains at least one aliphatic aldehyde of the formula R-CHO as defined in the claim 1 for the anti-corrosive agent.
Claim 4
Dependent Claim
31 words
A process as claimed in claim 1 in which the electolyte employed contains at least one amide of the formula R-CONH2 as defined in the claim 1 for the anti-corrosive agent.
Claim 5
Dependent Claim
18 words
A process as claimed in claim 1 in which the electrolyte employed contains urea as the anti-corrosive agent.
Claim 6
Dependent Claim
19 words
A process as claimed in claim 1 in which the electrolyte employed contains chromic acid as the anti-corrosive agent.
Claim 7
Dependent Claim
43 words
A process as claimed in claim 1 in which the electrolyte employed contains at least one known non-ionic surface-active agent as the anti-corrosive agent at a concentration of 0.05 percent to 1 percent by weight based on the entire weight of the electrolyte.
Claim 8
Dependent Claim
55 words
A process as claimed in claim 1 in which the electrolyte employed contains also at least one selected from magnesium chloride, aluminum chloride, zinc chloride and ammonium chloride as a secondary etching agent at a total concentration of the chloride ions of up to 8 percent by weight of the entire weight of the electrolyte.
Claim 9
Dependent Claim
55 words
A process as claimed in claim 1 in which the electrolytic treatment of the aluminum base sheet with an alternating electric current in the electrolyte containing hydrochloric acid as the primary etching agent and at least one anti-corrosive agent is effected for a time of 20 to 60 seconds at a temperature of 20* -30*C.
Claim 10
Dependent Claim
33 words
A process as claimed in claim 1 in which an alternating electric current having a current density of 40 - 70 A/dm2 is used for the electrolytic treatment of the aluminum base sheet.
Claim 11
Dependent Claim
33 words
A process as claimed in claim 1 in which the process further comprises a subsequent step of anodizing the roughened surface of the aluminum sheet which is carried out in a known manner.
Claim 12
Dependent Claim
59 words
A process as claimed in claim 1 in which the process further comprises a subsequent step of anodizing the roughened surface of the aluminum sheet which is carried out in a known manner, followed by a more further step of causing finely divided silica particles to be deposited and adsorbed by the anodized, roughened surface of the aluminum sheet.
Claim 13
Dependent Claim
123 words
A process for the continuous production of an aluminum base offset printing plate, which comprises a step of roughening the surface of an aluminum base sheet in the form of a continuous strip in a continuous manner by electrolytically treating the aluminum strip with an alternating electric current at a current density of 40 - 80 A/dm2 for a time of 15 - 60 seconds in an electrolyte essentially consisting of an aqueous solution containing 2 - 3 percent by weight of hydrogen chloride, 0.05 -0.5 percent by weight of a non-ionic surface-active agent which may preferably be selected from polethyleneglycol alkylphenyl ethers, polyethyleneglycol alkylethers and fatty acid esters of polyethyleneglycol, up to 5 percent by weight of a mono-amine of the formula
Claim 14
Dependent Claim
114 words
A process as claimed in claim 14 in which the aluminum strip is roughened in a continuous manner by electrolytically treating with an alternating electric current at a current density of 40 -80 A/dm2 for a time of 15 - 60 seconds in an aqueous electrolyte containing 2 - 3 percent by weight of hydrogen chloride and 0.05 - 0.5 percent by weight of a non-ionic surface-active agent which may be selected from polyethyleneglycol alkylphenyl ethers, polyethyleneglycol alkylethers and fatty acid esters of polyethyleneglycol, while advancing the aluminum strip continuously in the submerged condition through the bath of said electrolyte in an elongated electrolysis vessel of such arrangement as defined in the claim 14.
Claim 15
Dependent Claim
137 words
A process as claimed in claim 14 in which the aluminum 16. A process as claimed in claim 14 in which the aluminum strip is roughened in a continuous manner by electrolytically treating with an alternating electric current at a current density of 40 -80 A/dm2 for a time of 15 - 60 seconds in an aqueous electrolyte containing 2 - 3 percent by weight of hydrogen chloride, 0.05 -0.5 percent by weight of a non-ionic surface-active agent which may be selected from polyethyleneglycol alkylphenyl ethers, polyethyleneglycol alkylethers and fatty acid esters of polyethyleneglycol, and up to 5 percent by weight of aluminum chloride or magnesium chloride, while advancing the aluminum strip continuously in the submerged condition through the bath of said electrolyte in an elongate electrolysis vessel of such arrangement as defined in the claim 14.
Claim 16
Dependent Claim
135 words
A process as claimed in claim 14 in which the aluminum strip is roughened in a continuous manner by electrolytically treating with an alternating electric current at a current density of 40 -80 A/dm2 for a time of 15 - 60 seconds in an aqueous electrolyte containing 2 - 3 percent by weight of hydrogen chloride, 0.05 -0.5 percent by weight of a non-ionic surface-active agent which may be selected from polyethyleneglycol alkylphenyl ethers, polyethyleneglycol alkylethers and fatty acid esters of polyethyleneglycol, and 0.05 - 0.5 percent by weight of a monoamine which may be selected from mono-ethanol amine, di-ethanol amine and tri-ethanol amine, while advancing the aluminum strip continuously in the submerged condition through the bath of said electrolyte in an elongated electrolysis vessel of such an arrangement ad defined in the claim 14.
Claim 17
Dependent Claim
147 words
A process as claimed in claim 14 in which the aluminum strip is roughened in a continuous manner by electrolytically treating with an alternating electric current at a current density of 40 -80 A/dm2 for a time of 15 - 60 seconds in an aqueous electrolyte containing 2 - 3 percent by weight of hydrogen chloride, 0.05 -0.5 percent by weight of a non-ionic surface-active agent which may be selected from polyethyleneglycol alkylphenyl ethers, polyethyleneglycol alkylethers and fatty acid esters of polyethyleneglycol, 0.05 - 5 percent by weight of a mono-amine which may be selected from mono-ethanol amine, di-ethanol amine and tri-ethanol amine, and up to 5 percent by weight of aluminum chloride or magnesium chloride, while advancing the aluminum strip continuously in the submerged condition through the bath of said electrolyte in an elongated electrolysis vessel of such an arrangement as defined in the claim 14.
Claim 18
Dependent Claim
93 words
A process as claimed in claim 14 in which the aluminum strip is roughened in a continuous manner by electrolytically treating with an alternating electric current at a current density of 40 -70 A/dm2 for a time of 20 - 30 seconds in an aqueous electrolyte containing 2 - 3 percent by weight of hydrogen chloride, up to 3 percent by weight of aluminum chloride, 0.5 - 3 percent by weight of tri-ethanol amine and 0.05 - 0.1 percent by weight of a non-ionic surface-active agent which may preferably be polyethyleneglycol octylphenyl ether.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |