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Patent US4023973A successfully refreshed from Google Patents.
US4023973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photosensitive composition using maleic anhydride adduct of a 1,2 polybutadiene
Assignee: JSR Corp
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Filing: 1975-04-17
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Granted: 1977-05-17
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Expires: 1995-04-17
Abstract
Abstract A photosensitive composition comprising (1) a maleic anhydride adduct of 1,2-polybutadiene having a molecular weight of 10,000 or higher, (2) at least one photosensitizer and/or at least one photosensitive crosslinking agent, and, if necessary, (3) at least one acrylic monomer. This composition can be developed with water or a polar solvent such as an alcohol, and its layer formed on a support provides a printing plate. When the acrylic monomer is contained, the composition is suitable for use in flexographic printing.
Inventors
- 👤 Fumitake Imaizumi
- 👤 Isao Nagaoka
- 👤 Mitsuo Kurokawa
- 👤 Koei Komatsu
- 👤 Yasuyuki Takimoto
- 👤 Hidefumi Kusuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:47
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/038; G03F7/0388; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/106; Y10S430/111; Y10S430/114; Y10S430/118; Y10S430/124; Y10S430/128
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
149 words
A photosensitive composition, comprising: a mixture of a maleic anhydride adduct of a 1,2-polybutadiene having a viscosity-average molecular weight of at least 10,000 and having a vinyl content of at least 70% and at least one member selected from the group consisting of photosensitizers and photosensitive cross-linking agents, wherein said photosensitizer is selected from the group consisting of carbonyl compounds, nitro compounds, aromatic hydrocarbon compounds, haloketones and acyloin ethers, and wherein said photosensitive cross-linking agent is an azido type cross-linking agent, whereby, when said photosensitive composition on a supporting substrate is exposed to light, that portion of said composition exposed to light hardens, while that portion of said composition which is masked from light, remains unhardened and is readily removed from the hardened composition by treatment with water, an alcohol or a mixture of water, an alcohol and an ether, thereby leaving the hardened image on its supporting substrate.
Claim 2
Dependent Claim
149 words
A photosensitive composition, comprising: a mixture of a maleic anhydride adduct of a 1,2-polybutadiene having a viscosity-average molecular weight of at least 10,000 and having a vinyl content of at least 70% and at least one member selected from the group consisting of photosensitizers and photosensitive cross-linking agents, wherein said photosensitizer is selected from the group consisting of carbonyl compounds, nitro compounds, aromatic hydrocarbon compounds, haloketones and acyloin ethers, and wherein said photosensitive cross-linking agent is an azido type cross-linking agent, whereby, when said photosensitive composition on a supporting substrate is exposed to light, that portion of said composition exposed to light hardens, while that portion of said composition which is masked from light, remains unhardened and is readily removed from the hardened composition by treatment with water, an alcohol or a mixture of water, an alcohol and an ether, thereby leaving the hardened image on its supporting substrate.
Claim 3
Dependent Claim
19 words
A photosensitive composition according to claim 1, wherein the 1,2-polybutadiene has a viscosity-average molecular weight of 10,000 to 150,000.
Claim 4
Dependent Claim
17 words
A photosensitive composition according to claim 1, wherein the 1,2-polybutadiene has a crystallinity of 5% to 45%.
Claim 5
Dependent Claim
24 words
A photosensitive composition according to claim 1, wherein the bonded maleic anhydride content of the maleic anhydride adduct is 10 to 30% by weight.
Claim 6
Dependent Claim
21 words
A photosensitive composition according to claim 1, wherein the maleic anhydride adduct is partially or completely neutralized with an alkali metal.
Claim 7
Dependent Claim
13 words
A photosensitive composition according to claim 5, wherein the alkali metal is lithium.
Claim 8
Dependent Claim
15 words
A photosensitive composition according to claim 1, wherein the photosensitizer is selected from acyloin ethers.
Claim 9
Dependent Claim
34 words
A photosensitive composition according to claim 7, wherein the acyloin ether is selected from the group consisting of benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin n-butyl ether and benzoin octyl ether.
Claim 10
Dependent Claim
28 words
A photosensitive composition according to claim 1, wherein the amount of the photosensitizer is 0.1 to 20 parts by weight per 100 parts by weight of the adduct.
Claim 11
Dependent Claim
34 words
A photosensitive composition according to claim 1, wherein the photosensitive crosslinking agent is selected from the group consisting of 4,4'-diazidostilbene, p-phenylenebisazide, 4,4'-diazidobenzophenone, 4,4'-diazidodiphenylmethane, 4,4'-diazidochalcone, 2,6-di(4'-azidobenzal) cyclohexanone, 4,4'-diazidostilbene-α-carboxylic acid, 4,4'-diazidodiphenyl, 4,4'-diazido-3,3'-dimethyldiphenyl, 2,7-diazidofluorene, and sodium 4,4'-diazidobenzalacetone-2-sulfonate.
Claim 12
Dependent Claim
20 words
A printing plate composed of a layer of the photosensitive composition according to claim 1 coated on a supporting substrate.
Claim 13
Dependent Claim
14 words
The printing plate according to claim 1, wherein the substrate is a flexible support.
Claim 14
Dependent Claim
172 words
A photosensitive composition, comprising: a mixture of a maleic anhydride adduct of a 1,2-polybutadiene having a viscosity-average molecular weight of at least 10,000 and having a vinyl content of at least 70% and at least one member selected from the group consisting of photosensitizers and photosensitive cross-linking agents, wherein said photosensitizer is selected from the group consisting of carbonyl compounds, nitro compounds, aromatic hydrocarbon compounds, haloketones and acyloin ethers, and wherein said photosensitive cross-linking agent is an azido type cross-linking agent, and at least one acrylic monomer selected from the group consisting of esters, amides, and metal salts of acrylic and methyacrylic acids, whereby, when said photosensitive composition on a supporting substrate is exposed to light, that portion of said composition exposed to light hardens, while that portion of said composition which is masked from the light, remains unhardened and is readily removed from the hardened composition by treatment with water, an alcohol or a mixture of water, and alcohol and an ether, thereby leaving the hardened image on its supporting substrate.
Claim 15
Dependent Claim
172 words
A photosensitive composition, comprising: a mixture of a maleic anhydride adduct of a 1,2-polybutadiene having a viscosity-average molecular weight of at least 10,000 and having a vinyl content of at least 70% and at least one member selected from the group consisting of photosensitizers and photosensitive cross-linking agents, wherein said photosensitizer is selected from the group consisting of carbonyl compounds, nitro compounds, aromatic hydrocarbon compounds, haloketones and acyloin ethers, and wherein said photosensitive cross-linking agent is an azido type cross-linking agent, and at least one acrylic monomer selected from the group consisting of esters, amides, and metal salts of acrylic and methyacrylic acids, whereby, when said photosensitive composition on a supporting substrate is exposed to light, that portion of said composition exposed to light hardens, while that portion of said composition which is masked from the light, remains unhardened and is readily removed from the hardened composition by treatment with water, an alcohol or a mixture of water, and alcohol and an ether, thereby leaving the hardened image on its supporting substrate.
Claim 16
Dependent Claim
19 words
A photosensitive composition according to claim 13, wherein the 1,2-polybutadiene has a viscosity-average molecular weight of 10,000 to 150,000.
Claim 17
Dependent Claim
41 words
A photosensitive composition according to claim 13, wherein the ester is selected from the group consisting of alkyl esters, hydroxyalkyl esters, alkylene glycol diesters, polyalkylene glycol diesters, alkoxyalkylene glycol monoesters, alkoxypolyalkylene glycol monoesters, and di-, tri-, and tetraesters of polyhydric alcohols.
Claim 18
Dependent Claim
57 words
A photosensitive composition according to claim 15, wherein the acrylic monomer is selected from the group consisting of n-butyl methacrylate, pentyl methacrylate, 2-ethylhexyl methacrylate, octyl methacrylate, lauryl methacrylate, stearyl methacrylate, o-carboxybenzoyloxyethyl methacrylate, o-carboxybenzoyl-2-oxypropyl methacrylate, (di-2-oxyethyl)phthalate monomethacrylate, (di-2-oxypropyl)phthalate monomethacrylate, methoxypolyethylene glycol methacrylates, polyethylene glycol dimethacrylates having 9 to 23 ethylene oxide units, and acrylates corresponding to these methacrylates.
Claim 19
Dependent Claim
30 words
A photosensitive composition according to claim 15, wherein the acrylic monomer is selected from the group consisting of o-carboxybenzoyloxyethyl methacrylate, o-carboxybenzoyl-2-oxypropyl methacrylate, (di-2-oxyethyl)phthalate monomethacrylate, and acrylates corresponding to these methacrylates.
Claim 20
Dependent Claim
30 words
A photosensitive composition according to claim 13, wherein the metal salt of acrylic acid is selected from the group consisting of calcium acrylate, zinc acrylate, magnesium acrylate, and aluminum acrylate.
Claim 21
Dependent Claim
31 words
A photosensitive composition according to claim 13, wherein the amount of the acrylic monomer is 5 to 200 parts by weight per 100 parts by weight of the maleic anhydride adduct.
Claim 22
Dependent Claim
31 words
A photosensitive composition according to claim 13, wherein the amount of the acrylic monomer is 10 to 100 parts by weight per 100 parts by weight of the maleic anhydride adduct.
Claim 23
Dependent Claim
20 words
A printing plate composed of a layer of the photosensitive material according to claim 13 coated on a supporting substrate.
Claim 24
Dependent Claim
14 words
The printing plate according to claim 21, wherein the substrate is a flexible support.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |