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 Title: |
US3802885:
PHOTOSENSITIVE LITHOGRAPHIC NAPHTHOQUINONE DIAZIDE PRINTING PLATE WITH ALUMINUM BASE
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Lawson, Leslie Edward; Orpington, United Kingdom
Smith, Frank Edward; Orpington, United Kingdom
Smith, Peter John; Orpington, United Kingdom
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| Assignee: |
Algraphy Limited, Kent, United Kingdom
other patents from ALGRAPHY LIMITED (18375) (approx. 4)
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| Published / Filed: |
1974-04-09
/ 1971-07-29
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| Application Number: |
US1971000167438
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| IPC Code: |
Advanced:
G03F 7/023;
Core:
more...
IPC-7:
G03F 7/08;
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| U.S. Class: |
Current:
430/165;
430/192;
430/193;
Original:
096/075;
096/033;
096/091.D;
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| Field of Search: |
096/91 D,75,49.33,36.3,36,115 R
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| Priority Number: |
| 1968-12-20 |
US1968000785782 |
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| Abstract: |
A positive-acting printing plate having a coating containing a naphthoquinone-(1,2)-diazide-(2)-5-sulphonic acid derivative, the printing life of which has been improved by the inclusion of a polymeric carboxylic acid. Specific derivatives are 2,3,4-trihydroxy benzophenone tris- and 2,4-dihydroxy benzophenone bis-[naphthoquinone-(1,2)-diazide-(2)-5-sulphonate]. The coating includes a resin in particular an alkali-soluble novolak resin. The polymeric carboxylic acid is preferably present in an amount of 2 - 50 percent by weight based on the combined weight of said derivative and said resin. The invention makes possible the use of naphthoquinone-(1,2)-diazide-(2)-5-sulphonic acid derivatives hitherto unusable because of bad printing life of the plate.
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| Primary / Asst. Examiners: |
Bowers, Jr., Charles L.;
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| INPADOC Legal Status: |
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