US3836368A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photopolymerizable element comprising a conjugated diacetylene layer on the photopolymer layer
Assignee: BASF SE
•
Filing: 1972-09-20
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Granted: 1974-09-17
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Expires: 1992-09-20
Abstract
Abstract Photopolymer printing plates having, on top of a photosensitive layer (a) attached to a base, a thin layer (b) of a suspension of finely crystalline conjugated diacetylene compounds in a binder, which compounds change color when photopolymerized. Such printing plates make possible the production of positive copies of a positive transparency by producing in layer (b) an image with areas which do not transmit light by exposure to light having a wavelength of less than 320 m Mu and optional fixing, and initiating photopolymerization in layer (a) by exposing it through the said image to light having a wavelength of from 320 to 450 m Mu and then washing out the unexposed areas of layer (a).
Inventors
- 👤 M Jun
- 👤 K Penzien
- 👤 G Wegner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:37
CPC Classifications
G; G03; G03F; G03F1/00; G03F1/68
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
45 words
A photopolymerizable element as set forth in claim 1 wherein the photopolymerized acetylenes in layer (b), after fixation, absorb light of the region of the spectrum having a wavelength of from about 320 to 450 m Mu to the extent of at least 90 percent.
Claim 2
Dependent Claim
22 words
A photopolymerizable element as set forth in claim 1 wherein the photopolymerizable diacetylene compounds contained in layer (b) are urethanes of hexadiyne-2,4-diol-1,6.
Claim 3
Dependent Claim
20 words
A photopolymerizable element as set forth in claim 1 wherein the diacetylene compound present in layer (b) is hexadiyne-2,4-diol-1,6-bis-n-hexyl urethane.
Claim 4
Dependent Claim
47 words
A photopolymerizable element as set forth in claim 1 wherein layer (b) consists of 5 to 80 percent by weight of diacetylene compound and 20 to 95 percent by weight of a polymeric binder which transmits light of a wavelength of more than 250 m Mu .
Claim 5
Dependent Claim
28 words
A photopolymerizable element as set forth in claim 1 wherein the polymeric binder present in layer (b) is a polyvinylpyrrolidone having a K value of 70 to 90.
Claim 6
Dependent Claim
23 words
A photopolymerizable element as set forth in claim 1 wherein said layer (b) has a thickness of from 2 to 100 Mu .
Claim 7
Dependent Claim
36 words
A photopolymerizable element as set forth in claim 1 wherein said layer (b) has a thickness of from 2 to 100 and wherein said layer (a) has a thickness of from 2 to 1,000 Mu .
References Cited (Backward Citations)
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |