CA2129243A1 - Material in the form of a sheet, a foil or a strip having a hydrophilic surface sealing, method for producing it and its use - Google Patents
Material in the form of a sheet, a foil or a strip having a hydrophilic surface sealing, method for producing it and its useInfo
- Publication number
- CA2129243A1 CA2129243A1 CA002129243A CA2129243A CA2129243A1 CA 2129243 A1 CA2129243 A1 CA 2129243A1 CA 002129243 A CA002129243 A CA 002129243A CA 2129243 A CA2129243 A CA 2129243A CA 2129243 A1 CA2129243 A1 CA 2129243A1
- Authority
- CA
- Canada
- Prior art keywords
- sealing
- foil
- strip
- sheet
- solution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/04—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain a surface receptive to ink or other liquid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/02—Letterpress printing, e.g. book printing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2202/00—Metallic substrate
- B05D2202/20—Metallic substrate based on light metals
- B05D2202/25—Metallic substrate based on light metals based on Al
Abstract
A material having a hydrophilic surface sealing and a method for producing it are provided, the surface sealing being produced by a solution which contains polyvinyl phosphonic acid and hydrofluoric acid. The advantages of the invention are improved properties in use and a simple production.
Description
WO 93tl5156 PCT/EP93/~235 M~t~rial in th~ foxm of a ~e~t, a fo$1 or ~ str~p h~lng a bydroph~l~c ~urfaoe seal~ng, u~t~o~ for produ~ t ~nd ~tJ
u~
The invention relates to a materi~l having a hydrophilic surface sealing, and to a method for producing it~
Such a material can be used ~s support for a radiation-sensiti~e layer of an offse~ printing plate.
In the radiation-sensitive layer a printing image i8 photomechanically copied, image-free locations on the support being formad~by removing the corre~ponding areas of the r~diation-sensitive layer. Simultaneou ly, the i~age-free loc~tions for~ the baokground of the image. Wi~h r~gard to th~ printing proces~, it m~st b~ guaranteed that the image locations are hydrophobic and colour-absorbing and the image-free loc~tion~ are hydrophilic and thus r~pel the oily or oleophilic printing colo~r~. In addition, the support ~ust en~ure a good adhesion of the radio--sensitive layer in the image areas.
Therefore, the prior art suggests an additional coating, the so-called sealing, between ~he support and the ràdio-5en5itive layer fGr improving the adhe8ior! of the latter and prevent~ng staining of the suppQrt.
Known methods are for instance the sealing with si~icat~, with Gondensed aryl sulfonic acid (DE-A-32 17 870), with polyvinyl phosphonic acid (PVPA) (~E-A-16 21 478) or with an aqueous mixture of a hydroly~ate or a condensate of a silane W093/151~ PCT/EP93/~235 212~24`3 `
and a f luoride of an alkali metal or of the metals Ti, Zr or Si ~DE-A-39 28 794)~
EP-A-o 089 510 discloses a support material of aluminum or an alloy thereof which is covered with a hydrophilic sealing -;
layer which i8 produced inter alia by using polyvinyl phosphonic acid with admixtures of ~ilicates, borates and fluoroborates. These admixtures improve the adhesion of the image, the shelf-life of the radiation-sensitive layer, the hydrophilic action and ithe resistance to SnC12.
The problem underlying the invention is to provide a support materi~l having a hydrophilic surface ~ealing and a method for producing it by means of which the support characteristics are further improved and a universally usable sealing is achieved which has advantages for po~itively, negatively as well as for instance electrophotographical-ly working printing plates.
This problem is solved with thei feature~ of the claims~
,:
The ~olution according to the invention is ba~ed on the idea to mix polyvinyl phosphonic acid with hydrofluoric acid a~
~n agont which etches t~ie support ~urface, and to use this a~ ~ealing solution.
It hai been found that the invention m~kes it possible to develop al80 strongly tinted coatings with weak positive developers in a staining-free manner. The a~ount- of hydrophilizing PVPA may be incre~ed without impairing the adhe~ion of the coating and thus the pressure tabi~ity. The sealing solution according to the invention allows the sealing of mechanically and electrolytically roughened surfaces as well as of surfaces which are galvanically pIated with chromium.
212~2~3 .. . .
In the foll~ ng, the invention is explained in detail by means of Examples.
An electrolytically grained aluminum substrat~ was anodiz~d in sulfuric acid to 4 g~m2 oxide. After repeated rin~ing with deionized water the plate wa8 dipped in the following sealing solution: 0.5 q/l PVPA and 0.3 g/l HF (t00 %), at a temperature of the bath of 50C for l0 seconds. This was followed by a rinse of tap water, squeegee and ~rying at 100C ~or l min.
The resulting sealed basis was coated with the following positiva solution (indicated in parts by weight):
7 parts by weight CF-novolak 2 parts by weight 2,1-naphthoquinone diazole -4-sulfonic acid ester of a CF novolak 0.11 parts by weight crystal violet 0.05 parts ~y weight triazine B
u~
The invention relates to a materi~l having a hydrophilic surface sealing, and to a method for producing it~
Such a material can be used ~s support for a radiation-sensiti~e layer of an offse~ printing plate.
In the radiation-sensitive layer a printing image i8 photomechanically copied, image-free locations on the support being formad~by removing the corre~ponding areas of the r~diation-sensitive layer. Simultaneou ly, the i~age-free loc~tions for~ the baokground of the image. Wi~h r~gard to th~ printing proces~, it m~st b~ guaranteed that the image locations are hydrophobic and colour-absorbing and the image-free loc~tion~ are hydrophilic and thus r~pel the oily or oleophilic printing colo~r~. In addition, the support ~ust en~ure a good adhesion of the radio--sensitive layer in the image areas.
Therefore, the prior art suggests an additional coating, the so-called sealing, between ~he support and the ràdio-5en5itive layer fGr improving the adhe8ior! of the latter and prevent~ng staining of the suppQrt.
Known methods are for instance the sealing with si~icat~, with Gondensed aryl sulfonic acid (DE-A-32 17 870), with polyvinyl phosphonic acid (PVPA) (~E-A-16 21 478) or with an aqueous mixture of a hydroly~ate or a condensate of a silane W093/151~ PCT/EP93/~235 212~24`3 `
and a f luoride of an alkali metal or of the metals Ti, Zr or Si ~DE-A-39 28 794)~
EP-A-o 089 510 discloses a support material of aluminum or an alloy thereof which is covered with a hydrophilic sealing -;
layer which i8 produced inter alia by using polyvinyl phosphonic acid with admixtures of ~ilicates, borates and fluoroborates. These admixtures improve the adhesion of the image, the shelf-life of the radiation-sensitive layer, the hydrophilic action and ithe resistance to SnC12.
The problem underlying the invention is to provide a support materi~l having a hydrophilic surface ~ealing and a method for producing it by means of which the support characteristics are further improved and a universally usable sealing is achieved which has advantages for po~itively, negatively as well as for instance electrophotographical-ly working printing plates.
This problem is solved with thei feature~ of the claims~
,:
The ~olution according to the invention is ba~ed on the idea to mix polyvinyl phosphonic acid with hydrofluoric acid a~
~n agont which etches t~ie support ~urface, and to use this a~ ~ealing solution.
It hai been found that the invention m~kes it possible to develop al80 strongly tinted coatings with weak positive developers in a staining-free manner. The a~ount- of hydrophilizing PVPA may be incre~ed without impairing the adhe~ion of the coating and thus the pressure tabi~ity. The sealing solution according to the invention allows the sealing of mechanically and electrolytically roughened surfaces as well as of surfaces which are galvanically pIated with chromium.
212~2~3 .. . .
In the foll~ ng, the invention is explained in detail by means of Examples.
An electrolytically grained aluminum substrat~ was anodiz~d in sulfuric acid to 4 g~m2 oxide. After repeated rin~ing with deionized water the plate wa8 dipped in the following sealing solution: 0.5 q/l PVPA and 0.3 g/l HF (t00 %), at a temperature of the bath of 50C for l0 seconds. This was followed by a rinse of tap water, squeegee and ~rying at 100C ~or l min.
The resulting sealed basis was coated with the following positiva solution (indicated in parts by weight):
7 parts by weight CF-novolak 2 parts by weight 2,1-naphthoquinone diazole -4-sulfonic acid ester of a CF novolak 0.11 parts by weight crystal violet 0.05 parts ~y weight triazine B
3 0 parts by weight isobutyl acetate parts by weight methylisobutyl acetate parts by weight methyl e~hyl ketone 9 parts by weight ethyl glycol No blue ~ining wa~ visible af~er development with Polychrome 2000 KH (l+S) - 1 1 KH 2000 ~ontains 66 g sodium ~ilicate, 9 g NaOH, ~2 g KOH and 913 g water. During printing, the plate show~d a good free wheel behaviour even after a long machine standstill. A high edition was achieved before the plate showed wear. A baked plate also showed the same good printing charact~ristics.
~mple_2 (negative plate) WO93/15156 ~ PCT/EP93/00235 212924~
A basis sealed as in Example 1 was coated with the followin~
solution (indicated in part~ by weight):
8 parts by weight diazonium polycondensate parts by weight oligomeric urethane acrylate (UR 3447) parts by weight tetrapolymeric acrylate (ACR 507) parts by weight Estane 4 parts by weight Victoria blu~
1 part by weight methyl orange-Na-salt 0.2 parts by weight phosphoric acid (85 %) parts by weight methyl Cellosolve parts by weight methanol A coating weight of 0.7 g/m2 was obtained. After d~vèlopment with 988 B - 1 1 988 B contains 10 g diethanol amine, 10 g 80dium octyl sulfate and 980 g water - , a shorter exposure time was found comp~red to a basi~ which wa~ only sealed with PVPA. During printing, we~r appeared considerably later than with the co~parative plate which had been exposed to the ~ame solid layer.
For comparison, the aluminum support of Example 1 was treated with a conventional coating ~olution.
Compa~ xa~Pl~
(to Example 1) Only 0.5 g/l PVPA was used instead of an aqueous PVPA/HF
solution. The resul~ing sealed ba~is was coated with the solution from Example 1.
After development with a po~itive developer (for instanGe Polychrome 2000 KH, 1 part concentrate and 5 parts of water), a blue staining became visible.
W093/151~ PCT/EP93~00235 21~9~3 s The Examples prove the clear advantage~ of the support material having a hydrophilic surface coating according to the invention in the use of offset printing plates.
~mple_2 (negative plate) WO93/15156 ~ PCT/EP93/00235 212924~
A basis sealed as in Example 1 was coated with the followin~
solution (indicated in part~ by weight):
8 parts by weight diazonium polycondensate parts by weight oligomeric urethane acrylate (UR 3447) parts by weight tetrapolymeric acrylate (ACR 507) parts by weight Estane 4 parts by weight Victoria blu~
1 part by weight methyl orange-Na-salt 0.2 parts by weight phosphoric acid (85 %) parts by weight methyl Cellosolve parts by weight methanol A coating weight of 0.7 g/m2 was obtained. After d~vèlopment with 988 B - 1 1 988 B contains 10 g diethanol amine, 10 g 80dium octyl sulfate and 980 g water - , a shorter exposure time was found comp~red to a basi~ which wa~ only sealed with PVPA. During printing, we~r appeared considerably later than with the co~parative plate which had been exposed to the ~ame solid layer.
For comparison, the aluminum support of Example 1 was treated with a conventional coating ~olution.
Compa~ xa~Pl~
(to Example 1) Only 0.5 g/l PVPA was used instead of an aqueous PVPA/HF
solution. The resul~ing sealed ba~is was coated with the solution from Example 1.
After development with a po~itive developer (for instanGe Polychrome 2000 KH, 1 part concentrate and 5 parts of water), a blue staining became visible.
W093/151~ PCT/EP93~00235 21~9~3 s The Examples prove the clear advantage~ of the support material having a hydrophilic surface coating according to the invention in the use of offset printing plates.
Claims (8)
1. A material in the form of a sheet, a foil or a strip having a hydrophilic surface sealing which can be produced by a sealing solution containing polyvinyl phosphonic acid (PVPA) in a concentration ranging from 0.01 to 10 g/l and hydrofluoric acid (HF) in a concentration ranging from 0.005 to 5 g/l.
2. The material according to claim 1, characterized in that the material consists of aluminum or an alloy thereof or that it is chromium-plated.
3. The material according to claim 1 or 2, characterized in that the material was anodically oxidized prior to the surface sealing.
4. The material according to any one of claims 1 to 3, characterized in that the sealing solution is an aqueous solution which contains other acids or anions in addition to PVPA and HF.
5. A method for the hydrophilic sealing of a material in the form of a sheet, a foil or a strip using a sealing solution according to claim 1, wherein the sealing solution is applied by spraying or by a dipping process at a temperature ranging from 5 to 90°C.
6. The method according to claim 5, wherein an aqueous rinse is provided after the application of the sealing.
7. The method according to any one of claims 5 to 6, characterized in that the material consists of aluminum or an alloy thereof or is chromium-plated.
8. The use of the material according to any one of claims 1 to 4 as substrate material in the production of an offset printing plate which carries a radiation-sensitive coating.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP4203010.2 | 1992-02-03 | ||
| DE19924203010 DE4203010C1 (en) | 1992-02-03 | 1992-02-03 | |
| PCT/EP1993/000235 WO1993015156A1 (en) | 1992-02-03 | 1993-02-02 | Material in the form of a sheet, a foil or a strip having a hydrophilic surface sealing, method for producing it and its use |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2129243A1 true CA2129243A1 (en) | 1993-08-05 |
Family
ID=6450852
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002129243A Abandoned CA2129243A1 (en) | 1992-02-03 | 1993-02-02 | Material in the form of a sheet, a foil or a strip having a hydrophilic surface sealing, method for producing it and its use |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0625175A1 (en) |
| CA (1) | CA2129243A1 (en) |
| DE (1) | DE4203010C1 (en) |
| WO (1) | WO1993015156A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995009384A1 (en) * | 1993-09-29 | 1995-04-06 | Hoechst Celanese Corporation | Process for improving the hydrophilicity of the substrate for a lithographic printing plate by treatment with polyvinyl phosphonic acid |
| JPH1159007A (en) * | 1997-08-26 | 1999-03-02 | Fuji Photo Film Co Ltd | Light-sensitive lithographic printing plate |
| US8632940B2 (en) | 2011-04-19 | 2014-01-21 | Eastman Kodak Company | Aluminum substrates and lithographic printing plate precursors |
| CN106957583A (en) * | 2017-02-16 | 2017-07-18 | 蚁术新材料科技（上海）有限公司 | A kind of preparation method of aluminum substrate sealing pores liquid and high hydrophilic aluminum substrate |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ZA6807938B (en) * | 1967-12-04 |
-
1992
- 1992-02-03 DE DE19924203010 patent/DE4203010C1/de not_active Expired - Lifetime
-
1993
- 1993-02-02 EP EP93914522A patent/EP0625175A1/en not_active Ceased
- 1993-02-02 WO PCT/EP1993/000235 patent/WO1993015156A1/en not_active Application Discontinuation
- 1993-02-02 CA CA002129243A patent/CA2129243A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| EP0625175A1 (en) | 1994-11-23 |
| WO1993015156A1 (en) | 1993-08-05 |
| DE4203010C1 (en) | 1993-07-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 19980202 |