US4588664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photopolymerizable compositions used in holograms
Assignee: Polaroid Corp
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Filing: 1984-08-20
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Granted: 1986-05-13
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Expires: 2004-08-20
Abstract
Abstract Novel photopolymerizable compositions are provided which comprise a dye sensitizer, a branched polyethylenimine as a polymerization initiator and a free radical polymerizable ethylenic unsaturated monomer. In the preferred embodiments, the branched polyethylenimine is used in combination with lithium acrylate. This combination provides dry coatings which may be stored for extended periods prior to being activated for imaging, and which produce volume holograms of very high resolution and diffraction efficiency.
Inventors
- 👤 Herbert L. Fielding
- 👤 Richard T. Ingwall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:31
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/0005; G03F7/001; G03F7/004; G03F7/027; G03F7/032; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/114; Y10S430/12; Y10S430/127; Y10S430/146
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
27 words
A photopolymerizable composition comprising an ethylenic unsaturated monomer, a dye sensitizer, and a branched polyethylenimine, said dye sensitizer and said branched polyethylenimine providing a photopolymerization initiation system.
Claim 2
Dependent Claim
27 words
A photopolymerizable composition comprising an ethylenic unsaturated monomer, a dye sensitizer, and a branched polyethylenimine, said dye sensitizer and said branched polyethylenimine providing a photopolymerization initiation system.
Claim 3
Dependent Claim
22 words
A photopolymerizable composition as defined in claim 1 wherein at least 20% of the nitrogens in said branched polyethylenimine are tertiary nitrogens.
Claim 4
Dependent Claim
15 words
A photopolymerizable composition as defined in claim 1 wherein said dye sensitizer is methylene blue.
Claim 5
Dependent Claim
20 words
A photopolymerizable composition as defined in claim 1 wherein said ethylenic unsaturated monomer is a monovalent salt of acrylic acid.
Claim 6
Dependent Claim
16 words
A photopolymerizable composition as defined in claim 4 wherein said ethylenic unsaturated nonomer is lithium acrylate.
Claim 7
Dependent Claim
12 words
A photopolymerizable composition as defined in claim 5 further including poly-N-vinyl pyrrolidone.
Claim 8
Dependent Claim
21 words
A photopolymerizable element comprising a support carrying a layer comprising lithium acrylate, a branched polyethylenimine, a dye sensitizer and poly-N-vinyl pyrrolidone.
Claim 9
Dependent Claim
21 words
A photopolymerizable element comprising a support carrying a layer comprising lithium acrylate, a branched polyethylenimine, a dye sensitizer and poly-N-vinyl pyrrolidone.
Claim 10
Dependent Claim
22 words
A photopolymerizable element as defined in claim 7 wherein at least 20% of the nitrogens in said branched polyethylenimine are tertiary nitrogens.
Claim 11
Dependent Claim
15 words
A photopolymerizable element as defined in claim 7 wherein said dye sensitizer is methylene blue.
Claim 12
Dependent Claim
23 words
A photopolymerizable element as defined in claim 9, including a second dye sensitizer effective to extend the sensitivity range of said methylene blue.
Claim 13
Independent Claim
43 words
The method which comprises coating a support with a layer comprising lithium acrylate, a dye sensitizer, a branched polyethylenimine, and poly-N-vinylpyrrolidone, drying said layer, and storing said coated support in a low humidity environment whereby said lithium acrylate layer is maintained substantially non-photopolymerizable.
Claim 14
Independent Claim
43 words
The method which comprises coating a support with a layer comprising lithium acrylate, a dye sensitizer, a branched polyethylenimine, and poly-N-vinylpyrrolidone, drying said layer, and storing said coated support in a low humidity environment whereby said lithium acrylate layer is maintained substantially non-photopolymerizable.
Claim 15
Dependent Claim
18 words
The method of claim 11 including the step of humidifying said lithium acrylate layer to render it photosensitive.
Claim 16
Dependent Claim
12 words
The method of claim 11 wherein said dye sensitizer is methylene blue.
Claim 17
Dependent Claim
19 words
The method of claim 11 wherein at least 20% of the nitrogens in said branched polyethylenimine are tertiary nitrogens.
Claim 18
Dependent Claim
16 words
The method of claim 14 wherein said branched polyethylenimine has a molecular weight of about 60,000.
Claim 19
Dependent Claim
12 words
The method of claim 14 wherein said branched polyethylenimine is hydroxyethylated polyethylenimine.
Claim 20
Dependent Claim
11 words
The method of claim 11 wherein said dye sensitizer is erythrosin.
Claim 21
Dependent Claim
12 words
The method of claim 11 wherein said dye sensitizer is eosin Y.
Claim 22
Dependent Claim
12 words
The method of claim 11 wherein said dye sentizer is sodium riboflavin-5-phosphate.
Claim 23
Dependent Claim
29 words
The method of claim 12, including the step of exposing said humidified lithium acrylate layer to radiation effective to initiate photopolymerization and form a photopolymer image in said layer.
Claim 24
Dependent Claim
24 words
The method of claim 11 wherein said lithium acrylate is present in a stoichiometric excess based upon the total nitrogens in the branched polyethylenimine.
Claim 25
Independent Claim
51 words
The method of forming a photopolymer image which comprises imagewise exposing a photopolymerizable composition comprising an ethylenic unsaturated monomer, a dye sensitizer and a branched polyethylenimine to light absorbed by said dye sensitizer, said dye sensitizer and said branched polyethylenimine providing a photopolymerization system, thereby effecting imagewise photopolymerization of said monomer.
Claim 26
Independent Claim
51 words
The method of forming a photopolymer image which comprises imagewise exposing a photopolymerizable composition comprising an ethylenic unsaturated monomer, a dye sensitizer and a branched polyethylenimine to light absorbed by said dye sensitizer, said dye sensitizer and said branched polyethylenimine providing a photopolymerization system, thereby effecting imagewise photopolymerization of said monomer.
Claim 27
Dependent Claim
19 words
The method of claim 22 wherein at least 20% of the nitrogens in said branched polyethylenimine are tertiary nitrogens.
Claim 28
Dependent Claim
12 words
The method of claim 22 wherein said dye sensitizer is methylene blue.
Claim 29
Dependent Claim
12 words
The method of claim 22 wherein said dye sensitizer is sodium riboflavin-5-phosphate.
Claim 30
Dependent Claim
17 words
The method of claim 22 wherein said ethylenic unsaturated monomer is a monovalent salt of acrylic acid.
Claim 31
Dependent Claim
13 words
The method of claim 26 wherein said ethylenic unsaturated monomer is lithium acrylate.
Claim 32
Dependent Claim
12 words
The method of claim 27 wherein said photopolymerizable composition includes poly-N-vinyl pyrrolidone.
Claim 33
Dependent Claim
16 words
The method of claim 28 wherein said photopolymerizable composition is a coated layer on a support.
Claim 34
Dependent Claim
14 words
The method of claim 29 wherein said imagewise exposure is effected by a laser.
Claim 35
Dependent Claim
12 words
The method of claim 30 wherein said photopolymer image is a hologram.
Claim 36
Dependent Claim
22 words
The method of claim 22, including the step of stabilizing said photopolymer image by treating it with a solution of zirconium acetate.
Claim 37
Dependent Claim
24 words
The method of claim 27 wherein said lithium acrylate is present in a stoichiometric excess based upon the total nitrogens in said branched polyethylenimine.
Claim 38
Dependent Claim
22 words
The method of claim 29 including the step of stabilizing said photopolymer image by treating it with a solution of zirconium acetate.
Claim 39
Dependent Claim
19 words
The method of claim 22 including the step of uniformly exposing said photopolymerizable composition subsequent to said imagewise exposure.
Claim 40
Dependent Claim
22 words
The method of claim 30 including the step of uniformly exposing said photopolymerizable composition to white light subsequent to said imagewise exposure.
Claim 41
Dependent Claim
12 words
The method of claim 34 wherein said zirconium compound is zirconium actate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-05-12 | 1989-11-11 | 1990-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-12 | 1993-11-11 | 1994-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-12 | 1997-11-11 | 1998-05-13 | $7700.00 | Window Closed / Lapsed |