US4150989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photosensitive article having polyaldehydes and its use in photoimaging
Assignee: EIDP Inc
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Filing: 1977-10-06
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Granted: 1979-04-24
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Expires: 1997-10-06
Abstract
Abstract Photosensitive polyaldehydes are provided which have the formula: ##STR1## wherein R is a photosensitive end group selected from ##STR2## R 1 is H or n-alkyl of 1-5 carbon atoms, preferably H, R 2 is (a) n-alkanoyl of 1-4 carbon atoms or (b) n-alkanoyl of 1-4 carbon atoms or ##STR3## when R 1 is H, and N IS A POSITIVE INTEGER OF ABOUT 10-4000. The polyaldehydes are prepared by the anionic polymerization of the appropriate aldehyde with an initiating amount of an alkali metal or tetraalkylammonium alkoxide of RO in the above formula. The polyaldehydes are useful in articles and methods of relief imaging and in lithographic plates.
Inventors
- 👤 William J. Chambers
- 👤 Robert P. Foss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:56
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08G2/08; C08G2/14; C08L; C08L59/00; C08L59/02; G; G03; G03F; G03F7/00; G03F7/004; G03F7/038; G03F7/0387; G03F7/039
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
91 words
An imagable article comprising a substrate having on its surface a film of a composition comprising a blend of a photosensitive polyaldehyde having the formula: ##STR15## wherein R is a photosensitive end group selected from ##STR16## R 1 is H or n-alkyl of 1-5 carbon atoms, R 2 is (a) n-alkanoyl of 1-4 carbon atoms or (b) n-alkanoyl of 1-4 carbon atoms or ##STR17## when R 1 is H, and n is a positive integer of 10-4000 with a polymer capable of being cross-linked with aldehyde thermally released from the polyaldehyde.
Claim 2
Dependent Claim
91 words
An imagable article comprising a substrate having on its surface a film of a composition comprising a blend of a photosensitive polyaldehyde having the formula: ##STR15## wherein R is a photosensitive end group selected from ##STR16## R 1 is H or n-alkyl of 1-5 carbon atoms, R 2 is (a) n-alkanoyl of 1-4 carbon atoms or (b) n-alkanoyl of 1-4 carbon atoms or ##STR17## when R 1 is H, and n is a positive integer of 10-4000 with a polymer capable of being cross-linked with aldehyde thermally released from the polyaldehyde.
Claim 3
Dependent Claim
11 words
The article of claim 1 wherein the polymer is a polyamide.
Claim 4
Dependent Claim
10 words
The article of claim 2 wherein R 1 is H.
Claim 5
Dependent Claim
9 words
The article of claim 3 wherein R is ##STR18##
Claim 6
Dependent Claim
14 words
The article of claim 4 wherein R 2 is acetyl and n is 15-300.
Claim 7
Dependent Claim
26 words
The article of claim 3 in which R is ##STR19## and the polyaldehyde is present in the blend at a concentration of 5-30 percent by weight.
Claim 8
Dependent Claim
14 words
The article of claim 6 wherein R 2 is acetyl and n is 15-300.
Claim 9
Dependent Claim
19 words
The article of claim 6 wherein the film on the surface of the substrate is 0.01-25 mils in thickness.
Claim 10
Dependent Claim
11 words
The article of claim 6 which is a lithographic printing plate.
Claim 11
Dependent Claim
94 words
A process for the formation of images comprising (1) imagewise exposing the article of claim 1 to radiation of wavelength in the range of 2,000 A-8,000 A for a time sufficient to effect substantial rearrangement of the photosensitive end groups of the polyaldehyde; (2) heating the exposed article at a temperature and for a time sufficient to effect cleavage of the rearranged end groups, to release aldehyde monomer from the polyaldehyde, and to effect crosslinking of the polymer with the released aldehyde and (3) removing non-crosslinked polymer from the areas not exposed to radiation.
Claim 12
Dependent Claim
14 words
The process of claim 10 wherein the article is the article of claim 6.
Claim 13
Dependent Claim
20 words
The process of claim 11 wherein the exposed article is heated to a temperature in the range of 130°-185° C.
Claim 14
Dependent Claim
27 words
The process of claim 12 wherein the wavelength of exposing radiation is in the range of 2,500 A-5,000 A and the non-crosslinked polymer is removed by solvent.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-23 | 1982-10-23 | 1983-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-23 | 1986-10-23 | 1987-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-23 | 1990-10-23 | 1991-04-24 | $7700.00 | Window Closed / Lapsed |