US3754911A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoimaging method comprising crosslinking of alkoxy methyl polyamides
Assignee: Keuffel and Esser Co
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Filing: 1972-03-06
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Granted: 1973-08-28
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Expires: 1992-03-06
Abstract
Abstract Alkoxy methylated polyamide resin layers are imagewise insolubilized by exposure to light in the presence of halogenated organic photoinitiator compounds. The compositions are greatly improved in light sensitivity by the addition of dyes, and exposed layers are developable by selective dissolution in unexposed areas with aqueous developer solutions to form direct images, resists, or reprographic masters.
Inventors
- 👤 V Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:56
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/027; G03F7/032; G03F7/037; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/114; Y10S430/126; Y10S430/127
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
15 words
a light-sensitive halogen-containing photoactivator capable of generating halogen free radicals upon exposure to light; and
Claim 2
Dependent Claim
21 words
The method according to claim 1 wherein said material is maintained at a temperature between about 60*-130*C during said exposure step.
Claim 3
Dependent Claim
91 words
a photosensitizing dye; b. exposing said material imagewise to light for a time sufficient to generate halogen free-radicals from said photoactivator, thereby initiating crosslinking of said polyamide; c. heating the exposed material in the range of 60*-110*C for a time sufficient to complete the crosslinking of said polyamide in the light exposed areas, thereby reducing the solubility of said composition in said light exposed areas; d. treating the resulting material with a solvent for the unexposed areas of said composition; and e. removing dissolved areas of said composition from said material.
Claim 4
Dependent Claim
36 words
The method according to claim 1 wherein said treating step comprises contacting the material coating with an aqueous solution of a compound selected from the group consisting of lower aliphatic alcohols, chloral, bromal and sodium salicylate.
References Cited (Backward Citations)
No citation records indexed.
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 |