Patent US3770435A successfully refreshed from Google Patents.
US3770435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of gravure printing plates based on plastics materials
Assignee: BASF SE
•
Filing: 1971-12-08
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Granted: 1973-11-06
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Expires: 1991-12-08
Abstract
Abstract A process for the production of gravure printing plates by exposing through a continuous tone positive a layer of a photocrosslinkable material that is soluble in a developer solution but which becomes sparingly soluble or insoluble in said solution after exposure, which layer has been applied to a dimensionally stable substrate, subsequently laminating the exposed layer to a base so that the side originally facing the positive faces the base, re-exposing said laminated layer through a screen and washing out the non-crosslinked areas with the developer solution from the rear side. Tonally correct gravure printing plates based on plastics materials can be advantageously obtained by the process of the invention.
Inventors
- 👤 O Volkert
- 👤 M Zuerger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:45
CPC Classifications
G; G03; G03F; G03F5/00; G03F5/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
31 words
A process as claimed in claim 1, wherein said layer (S) contains, finely dispersed therein, 0.05 to 20 percent by weight of actinic-light-absorbing compounds which do not disturb the photopolymerization reaction.
Claim 2
Dependent Claim
86 words
A process as claimed in claim 1, wherein said layer (S) to which there has been firmly bonded a 5 to 100 Mu thick light-transmitting upper layer (U) of plastics material that is insoluble in said developer solution or has been insolubilized is exposed through said continuous tone positive from its front side through said upper layer (U), and said firmly adhering layer (S) and upper layer (U) are laminated to said base so that said upper layer (U) originally facing said positive faces said base.
Claim 3
Dependent Claim
53 words
A process as claimed in claim 1, wherein said base - prior to lamination of said layer (S) - bears an approximately 5 to 500 Mu thick layer (U'') of plastics material which is iNsoluble in said developer solution or has been insolubilized and which can be firmly bonded to said layers (S).
Claim 4
Dependent Claim
43 words
A process as claimed in claim 3, wherein said upper layer (U) consists of a crosslinked plastics material whose chemical composition is substantially the same as or similar to that of said layer (S) and which can be firmly bonded to the latter.
Claim 5
Dependent Claim
48 words
A process as claimed in claim 4, wherein said approximately 5 to 500 Mu thick layer (U'') consists of a crosslinked plastics material whose chemical composition is substantially the same as or similar to that of said layer (S) and which can be firmly bonded to the latter.
Claim 6
Dependent Claim
45 words
A process as claimed in claim 4, wherein said approximately 5 to 500 Mu thick layer (U'') consists of a crosslinked plastics material whose chemical composition is the same as that of said upper (U) layer and which can be firmly bonded to the latter.
Claim 7
Dependent Claim
71 words
A process as claimed in claim 3 wherein said base - prior to the lamination of said layer (S) and said upper layer (U) which have been exposed through said continuous tone positive - bears an approximately 5 to 500 micron thick layer (U) of plastics material which is insoluble in said developer solution or has been insolubilized and can be bonded to said layer (S) or said upper layer (U).
References Cited (Backward Citations)
US1464140A
Cited
US2149846A
Cited
US2165407A
Cited
US2532701A
Cited
US2628903A
Cited
US3154415A
Cited
US2912327A
Cited
US2914406A
Cited
US3129099A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |