Patent EP0070511B1 successfully refreshed from Google Patents.
EP0070511B1
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EP
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Photosensible recording materials for the production of intaglio printing forms resistant to abrasion and being scratchproof, and method of producing intaglio printing forms utilizing these recording materials
Assignee: BASF SE
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Filing: 1982-07-14
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Granted: 1984-12-19
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Expires: 2002-07-14
Abstract
No abstract record available.
Inventors
- 👤 John Dr. Lynch
- 👤 Albert Dr. Elzer
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 07:10
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/09; G03F7/115; Y; Y10; Y10S; Y10S430/00; Y10S430/151; Y10S430/162
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
234 words
A photosensitive recording material for the production of a gravure printing plate, which comprises a 30-500 f.Lm thick layer (L) which is applied to a dimensionally stable base and contains a photopolymerizable and/or photocrosslinkable material which is soluble or dispersible in a developer and becomes insoluble or non-dispersible therein when exposed to actinic light, wherein the photopolymerizable and/or photocrosslinkable material contains, at least in a surface zone having a thickness of from 1 to 50 µm, measured from the surface of the layer (L), which subsequently constitutes the surface of the printing plate, finely divided, abrasive particles in an amount of from 2 to 50 % by weight, based on the photopolymerizable and/or photocrosslinkable material containing these particles, the mean particle size being from 0.1 to 6 µm, not more than 5 % of the abrasive particles have a maximum particle size greater than 10 f.Lm, the particles have a hardness of > 4.0 on Mohs' hardness scale, the surface of the layer (L), which subsequently constitutes the surface of the printing plate, has a peak-to-valley height of < 2 li m, and the components of the photopolymerizable and/or photocrosslinkable material of the layer (L) are so chosen that this layer, after exposure, development and drying, has a Vickers hardness, measured under load, of not less than 10 N/mm 2 , at least to the depth of the wells which take up the ink.
Claim 2
Dependent Claim
234 words
A photosensitive recording material for the production of a gravure printing plate, which comprises a 30-500 f.Lm thick layer (L) which is applied to a dimensionally stable base and contains a photopolymerizable and/or photocrosslinkable material which is soluble or dispersible in a developer and becomes insoluble or non-dispersible therein when exposed to actinic light, wherein the photopolymerizable and/or photocrosslinkable material contains, at least in a surface zone having a thickness of from 1 to 50 µm, measured from the surface of the layer (L), which subsequently constitutes the surface of the printing plate, finely divided, abrasive particles in an amount of from 2 to 50 % by weight, based on the photopolymerizable and/or photocrosslinkable material containing these particles, the mean particle size being from 0.1 to 6 µm, not more than 5 % of the abrasive particles have a maximum particle size greater than 10 f.Lm, the particles have a hardness of > 4.0 on Mohs' hardness scale, the surface of the layer (L), which subsequently constitutes the surface of the printing plate, has a peak-to-valley height of < 2 li m, and the components of the photopolymerizable and/or photocrosslinkable material of the layer (L) are so chosen that this layer, after exposure, development and drying, has a Vickers hardness, measured under load, of not less than 10 N/mm 2 , at least to the depth of the wells which take up the ink.
Claim 3
Dependent Claim
44 words
A photosensitive recording material as claimed in claim 1, wherein the finely divided, abrasive particles are permeable to actinic light, and the refractive indices of the finely divided abrasive particles and of the photopolymerizable and/or photocrosslinkable material containing these particles are substantially the same.
Claim 4
Dependent Claim
83 words
A photosensitive recording material as claimed in claim 1, wherein the refractive indices of the finely divided, abrasive particles and of the photopolymerizable and/or photocrosslinkable material containing these particles are substantially the same, and the finely divided, abrasive particles strongly absorb actinic light, and are present in the layer (L) only to a depth of from 1 to 50 µm, preferably from 5 to 20 f.Lm, measured from the surface of the layer (L), which subsequently constitutes the surface of the printing plate.
Claim 5
Dependent Claim
85 words
A photosensitive recording material as claimed in claim 1, wherein the refractive indices of the finely divided, abrasive particles and of the photopolymerizable and/or photocrosslinkable material are different, and the finely divided, abrasive particles which absorb actinic light and/or those which do not absorb actinic light are present in the layer (L) only to a depth of from 1 to 50 f.Lm, preferably from 5 to 20 µm, measured from the surface of the layer (L), which subsequently constitutes the surface of the printing plate.
Claim 6
Dependent Claim
74 words
A photosensitive recording material as claimed in claims 1 to 4, wherein the photopolymerizable and/or photocrosslinkable material contains, at least in the zone of the layer (L) which contains the abrasive particles, a weakly absorbing photopolymerization initiator with an extinction coefficient s of < 350 cm 2 /millimole at 360 nm as well as a strongly absorbing photopolymerization initiator with an extinction coefficient s of more than 500 cm 2 /millimole at 360 nm.
Claim 7
Dependent Claim
24 words
A photosensitive recording material as claimed in claims 1 to 5, wherein the dimensionally stable base is a temporary base made from polyester film.
Claim 8
Dependent Claim
179 words
A process for the production of a gravure printing plate by exposing a photosensitive recording material, comprising a photopolymerizable and/or photocrosslinkable layer (L) on a dimensionally stable base, to actinic light through a halftone or line positive or through a continuous tone positive and a screen grid, washing out the non-exposed areas of the layer (L) by means of a developer in which these areas, but not the exposed areas, of the layer (L) are soluble or dispersible, and drying and optionally aftertreat- ing the resulting gravure printing plate, wherein a photosensitive recording material as claimed in claims 1 to 6 is used to produce the gravure printing plate. 8. A process for the production of a gravure printing plate, as claimed in claim 7, wherein a photosensitive recording material as claimed in claim 6 is used to produce the plate, the layer (L) being laminated, before or after exposure, onto a printing plate base, which is preferably provided with an adhesive layer, and the polyester film is then peeled off, this last step being carried out before washout.
Claim 9
Dependent Claim
40 words
A process for the production of a gravure printing plate, as claimed in claims 7 and 8, wherein the whole surface of the gravure printing plate is after-exposed to actinic light, after the plate has been washed out and dried.
Claim 10
Dependent Claim
48 words
A process for the production of a gravure printing plate, as claimed in claims 7 to 9, wherein the gravure printing plate is after-hardened at from 200 °C to 260 °C, after the unexposed areas have been washed out and the plate dried, and after any after-exposure step.
References Cited (Backward Citations)
No citation records indexed.
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