US4371602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photosensitive printing plate
Assignee: Tokyo Ohka Kogyo Co Ltd
•
Filing: 1979-03-09
•
Granted: 1983-02-01
•
Expires: 1999-03-09
Abstract
Abstract The photosensitive printing plate of this invention features incorporation of an organic foaming agent in the photosensitive composition that constitutes the photosensitive layer, said organic foaming agent being thermally decomposed upon drying of said composition under heating to thereby roughen the surface of the photosensitive layer. According to this invention, no specific mechanical treatment is required for forming the photosensitive layer and also there is no need of remodeling the existing coating equipments, and further, the vacuum contact time can be appreciably lessened, so that this invention can greatly improve the working efficiency in plate making and markedly reduce the production cost.
Inventors
- 👤 Hidenori Iwasaki
- 👤 Junichi Igarashi
- 👤 Shunichi Kasukawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:54
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/022; G03F7/0226; G03F7/008; G03F7/016; G03F7/0166; G03F7/09; G03F7/115
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
161 words
A photosensitive printing plate comprising a support and a photosensitive layer coated thereon, the photosensitive layer having a roughened surface especially suitable for vacuum contact of a negative thereon, the layer comprising a photosensitive composition containing a photosensitive resin and one or more organic foaming agents in an amount of approximately 3 to 30% by weight based on the photosensitive resin and wherein said organic foaming agent is thermally decomposed prior to exposure to light to produce a gas, thereby roughening the surface of said photosensitive layer; said resin is selected from the group consisting of polyvinyl cinnamate, derivatives of polyvinyl cinnamate, partially saponified polyvinyl acetate, diazo resin with acrylic copolymer, diazo resin and shellac mixture, condensates of diethyl-p-phenylene diacrylate, condensates of 1,4-di-β-hydroxyethyl-cyclohexane, and o-naphtho-quinonediazide; and said organic foaming agent is selected from the group consisting of dinitrosopentamethylenetetramine, N,N'-dimethyl-N,N'-dinitrosoterephthalamine, trinitrosotrimethylenetriamine, p-toluenesulfonylhydrazine, benzenesulfonylhydrazine, p,p'-oxybis (benzenesulfonylhydrazine), benzene-1,3-disulfonylhydrazine, 3,3'-disulfonylhydrazinephenylsulfone, toluene-2,4-disulfonylhydrazine, p,p'-thiobis(benzenesulfonylhydrazine), azobisisobutyronitrile, azodicarboneamide(azobisformamide), azoaminobenzene, azocarboxylic acid diethylester (diethylazocarboxylate), hydrazodicarbonamide, N,N'-dibenzoyl-hydrazine, β-acetylphenylhydrazine, biurea, and 1,1-diphenylhydrazine.
Claim 2
Dependent Claim
161 words
A photosensitive printing plate comprising a support and a photosensitive layer coated thereon, the photosensitive layer having a roughened surface especially suitable for vacuum contact of a negative thereon, the layer comprising a photosensitive composition containing a photosensitive resin and one or more organic foaming agents in an amount of approximately 3 to 30% by weight based on the photosensitive resin and wherein said organic foaming agent is thermally decomposed prior to exposure to light to produce a gas, thereby roughening the surface of said photosensitive layer; said resin is selected from the group consisting of polyvinyl cinnamate, derivatives of polyvinyl cinnamate, partially saponified polyvinyl acetate, diazo resin with acrylic copolymer, diazo resin and shellac mixture, condensates of diethyl-p-phenylene diacrylate, condensates of 1,4-di-β-hydroxyethyl-cyclohexane, and o-naphtho-quinonediazide; and said organic foaming agent is selected from the group consisting of dinitrosopentamethylenetetramine, N,N'-dimethyl-N,N'-dinitrosoterephthalamine, trinitrosotrimethylenetriamine, p-toluenesulfonylhydrazine, benzenesulfonylhydrazine, p,p'-oxybis (benzenesulfonylhydrazine), benzene-1,3-disulfonylhydrazine, 3,3'-disulfonylhydrazinephenylsulfone, toluene-2,4-disulfonylhydrazine, p,p'-thiobis(benzenesulfonylhydrazine), azobisisobutyronitrile, azodicarboneamide(azobisformamide), azoaminobenzene, azocarboxylic acid diethylester (diethylazocarboxylate), hydrazodicarbonamide, N,N'-dibenzoyl-hydrazine, β-acetylphenylhydrazine, biurea, and 1,1-diphenylhydrazine.
Claim 3
Dependent Claim
36 words
A photosensitive printing plate according to claim 1 wherein said organic foaming agent further contains a thermal decomposition assistant added in an amount of approximately 30 to 60% by weight based on the organic foaming agent.
Claim 4
Dependent Claim
32 words
A photosensitive printing plate according to claim 2 wherein said thermal decomposition assistant is selected from the group consisting of urea, urea derivatives, zinc white, lead carbonate, lead stearate, and glycolic acids.
Claim 5
Dependent Claim
171 words
A photosensitive printing plate comprising a support and a photosensitive layer coated thereon, the photosensitive layer having a roughened surface especially suitable for vacuum contact of a negative thereon, the layer comprising a photosensitive composition containing a photosensitive resin and one or more organic foaming agents in an amount of approximately 3 to 30 % by weight based on the photosensitive resin and wherein said organic foaming agent is thermally decomposed prior to exposure to light to produce a gas, thereby roughening the surface of said photosensitive layer; said organic foaming agent containing an organic foamable compound selected from the group consisting of dinitrosopentamethylenetetramine, N,N'-dimethyl-N,N'-dinitrosoterephthalamide, trinitrosotrimethylenetriamine, p-toluenesulfonylhydrazine, benzenesulfonylhydrazine, p,p'-oxybis(benzenesulfonylhydrazine), benzene-1,3-disulfonylhydrazine, 3,3'-disulfonylhydrazinephenylsulfone, toluene-2,4-disulfonylhydrazine, p,p'-thiobis(benzenesulfonylhydrazine), azobisisobutyronitrile, azodicarboneamide (azobisformamide), azoaminobenzene, azocarboxylic acid diethylester (diethylazocarboxylate), hydrazodicarbonamide, N,N'-dibenzoylhydrazine, β-acetylphenylhydrazine, biurea, and 1,1-diphenylhydrazine, and a thermal decomposition assistant in an amount of approximately 30 to 60% by weight based on the organic foamable compound, said thermal decomposition assistant being selected from the group consisting of urea, urea derivatives, zinc white, lead carbonate, lead stearate and glycolic acids.
Claim 6
Dependent Claim
171 words
A photosensitive printing plate comprising a support and a photosensitive layer coated thereon, the photosensitive layer having a roughened surface especially suitable for vacuum contact of a negative thereon, the layer comprising a photosensitive composition containing a photosensitive resin and one or more organic foaming agents in an amount of approximately 3 to 30 % by weight based on the photosensitive resin and wherein said organic foaming agent is thermally decomposed prior to exposure to light to produce a gas, thereby roughening the surface of said photosensitive layer; said organic foaming agent containing an organic foamable compound selected from the group consisting of dinitrosopentamethylenetetramine, N,N'-dimethyl-N,N'-dinitrosoterephthalamide, trinitrosotrimethylenetriamine, p-toluenesulfonylhydrazine, benzenesulfonylhydrazine, p,p'-oxybis(benzenesulfonylhydrazine), benzene-1,3-disulfonylhydrazine, 3,3'-disulfonylhydrazinephenylsulfone, toluene-2,4-disulfonylhydrazine, p,p'-thiobis(benzenesulfonylhydrazine), azobisisobutyronitrile, azodicarboneamide (azobisformamide), azoaminobenzene, azocarboxylic acid diethylester (diethylazocarboxylate), hydrazodicarbonamide, N,N'-dibenzoylhydrazine, β-acetylphenylhydrazine, biurea, and 1,1-diphenylhydrazine, and a thermal decomposition assistant in an amount of approximately 30 to 60% by weight based on the organic foamable compound, said thermal decomposition assistant being selected from the group consisting of urea, urea derivatives, zinc white, lead carbonate, lead stearate and glycolic acids.
References Cited (Backward Citations)
US2699392A
Cited
US3093478A
Cited
US2996381A
Cited
US3298833A
Cited
US3108872A
Cited
US3594166A
Cited
US3507678A
Cited
US3482973A
Cited
US3607273A
Cited
US3615629A
Cited
US4199359A
Cited
US4019909A
Cited
US3931762A
Cited
US3891443A
Cited
US4168979A
Cited
DE2514213A1
Cited
US4188222A
Cited
US4126460A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-31 | 1986-08-02 | 1987-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-31 | 1990-08-02 | 1991-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-31 | 1994-08-02 | 1995-02-01 | $7700.00 | Window Closed / Lapsed |