US4869993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical brightener containing positive working color proofing system
Assignee: Hoechst Celanese Chemical Co
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Filing: 1988-08-29
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Granted: 1989-09-26
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Expires: 2008-08-29
Abstract
Abstract This invention relates to positive working photosensitized sheet constructions which, upon exposure to an actinic radiation source through a screened image, can accurately reproduce said image. The construction is useful as a color proofing film which can be employed to predict the image quality from a lithographic printing process. The element is composed of a substrate, colored photosensitive layer and adhesive layer. The adhesive layer contains an optical brightener compound which reduces residual yellow staining derived from the naphthoquinone diazide sensitizer.
Inventors
- 👤 Wahib Farahat
- 👤 Dennis J. Bellville
- 👤 Richard L. Shadrach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:44
CPC Classifications
G; G03; G03F; G03F3/00; G03F3/10; Y; Y10; Y10S; Y10S430/00; Y10S430/134
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
323 words
A method for forming a colored image which comprises: (A.) providing a photosensitive element which comprises, in order: (i) a substrate having a release surface; and (ii) a colored photosensitive layer on said release surface, which photosensitive layer comprises a light sensitive, positive working, naphthoquinone diazide compound in an amount sufficient to photosensitize the layer; a resinous binder composition in an amount sufficient to bind the layer ingredients into a uniform admixture, which composition contains a major amount of at least one resin selected from the group consisting of a polyvinyl butyral polymer and a styrene-maleic anhydride copolymer half ester; and at least one colorant in an amount sufficient to uniformly color the layer; and (iii) an adhesive layer on said photosensitive layer, which adhesive layer comprises a major amount of a polymer such that said adhesive layer has a softening point in the range of from about 60° C. to about 180° C., and a sufficient amount of an optical brightener compound effective to reduce residual yellow color in the element derived from said diazide, and thereafter (B.) either (i) laminating said element with heat and pressure via said adhesive layer to a developer resistant receiver sheet and removing said substrate by the application of peeling forces; and imagewise exposing said photosensitive layer to actinic radiation; or (ii) imagewise exposing said photosensitive layer to actinic radiation; and laminating said element with heat and pressure via said adhesive layer to a developer resistant receiver sheet; and removing said substrate by the application of peeling forces; or (iii) laminating said element with heat and pressure via said adhesive layer to a developer resistant receiver sheet; and imagewise exposing said photosensitive layer to actinic radiation; and removing said substrate by the application of peeling forces; and (C.) removing the exposed areas of said photosensitive layer with a suitable liquid developer, which removing is conducted at a temperature at which said adhesive layer is substantially non-tacky.
Claim 2
Independent Claim
323 words
A method for forming a colored image which comprises: (A.) providing a photosensitive element which comprises, in order: (i) a substrate having a release surface; and (ii) a colored photosensitive layer on said release surface, which photosensitive layer comprises a light sensitive, positive working, naphthoquinone diazide compound in an amount sufficient to photosensitize the layer; a resinous binder composition in an amount sufficient to bind the layer ingredients into a uniform admixture, which composition contains a major amount of at least one resin selected from the group consisting of a polyvinyl butyral polymer and a styrene-maleic anhydride copolymer half ester; and at least one colorant in an amount sufficient to uniformly color the layer; and (iii) an adhesive layer on said photosensitive layer, which adhesive layer comprises a major amount of a polymer such that said adhesive layer has a softening point in the range of from about 60° C. to about 180° C., and a sufficient amount of an optical brightener compound effective to reduce residual yellow color in the element derived from said diazide, and thereafter (B.) either (i) laminating said element with heat and pressure via said adhesive layer to a developer resistant receiver sheet and removing said substrate by the application of peeling forces; and imagewise exposing said photosensitive layer to actinic radiation; or (ii) imagewise exposing said photosensitive layer to actinic radiation; and laminating said element with heat and pressure via said adhesive layer to a developer resistant receiver sheet; and removing said substrate by the application of peeling forces; or (iii) laminating said element with heat and pressure via said adhesive layer to a developer resistant receiver sheet; and imagewise exposing said photosensitive layer to actinic radiation; and removing said substrate by the application of peeling forces; and (C.) removing the exposed areas of said photosensitive layer with a suitable liquid developer, which removing is conducted at a temperature at which said adhesive layer is substantially non-tacky.
Claim 3
Dependent Claim
43 words
The method of claim 1 wherein steps A through C are repeated at least once whereby another photosensitive element having at least one different colorant is laminated onto said receptor sheet over the non-removed portions of the previously laminated photosensitive layer or layers.
Claim 4
Dependent Claim
11 words
The method of claim 1 wherein said substrate comprises polyethylene terepthalate.
Claim 5
Dependent Claim
12 words
The method of claim 1 wherein said substrate has a matte surface.
Claim 6
Dependent Claim
15 words
The method of claim 1 wherein said release surface on said substrate comprises polyvinyl alcohol.
Claim 7
Dependent Claim
19 words
The method of claim 1 wherein said photosensitive layer comprises the ester of bis-(3-benzoyl-4,5,6 trihydroxyphenyl) methane and 2-diazo-1-naphthol-5-sulfonic acid.
Claim 8
Dependent Claim
30 words
The method of claim 1 wherein said photosensitive layer further comprises one or more ingredients selected from the group consisting of plasticizers, acid stabilizers, antistatic compositions, uv absorbers and surfactants.
Claim 9
Dependent Claim
29 words
The method of claim 1 wherein the adhesive layer further comprises one or more ingredients selected from the group consisting of uv absorbers, anti-static compositions, resins, nitrocellulose and plasticizers.
Claim 10
Dependent Claim
12 words
The method of claim 1 wherein the adhesive layer comprises polyvinyl acetate.
Claim 11
Dependent Claim
23 words
The method of claim 1 wherein the laminating step is conducted at a temperature of from about 60° C. to about 90° C.
Claim 12
Dependent Claim
37 words
The method of claim 1 wherein said adhesive layer comprises one or more polymers selected from the group consisting of polyvinyl acetate containing copolymers, polyvinyl acetals, acrylic resins, cellulose nitrate, phenolic resins, epoxy resins and copolymers thereof.
Claim 13
Dependent Claim
25 words
The method of claim 1 wherein said optical brightener compound is selected from the group consisting of a triazinyl stilbene, pyrazoline, benzoxazole and coumarin derivative.
Claim 14
Dependent Claim
29 words
The method of claim 1 wherein said optical brightener compound is present in an amount of from about 0.01 to about 1.0 percent by weight of the adhesive layer.
Claim 15
Dependent Claim
165 words
A photosensitive element which comprises, in order: (i) a substrate having a release surface; and (ii) a colored photosensitive layer on said release surface, which photosensitive layer comprises a light sensitive, positive working, naphthoquinone diazide compound in an amount sufficient to photosensitize the layer; a resinous binder composition in an amount sufficient to bind the layer ingredients into a uniform admixture, which composition contains a major amount of at least one resin selected from the group consisting of a polyvinyl butyral polymer and a styrene-maleic anhydride copolymer half ester; and at least one colorant in an amount sufficient to uniformly color the layer; and (iii) an adhesive layer on said photosensitive layer, which adhesive layer comprises a major amount of a polymer such that said adhesive layer has a softening point in the range of from about 60° C. to about 180° C., and a sufficient amount of an optical brightener compound effective to reduce residual yellow color in the element derived from said diazide.
Claim 16
Dependent Claim
165 words
A photosensitive element which comprises, in order: (i) a substrate having a release surface; and (ii) a colored photosensitive layer on said release surface, which photosensitive layer comprises a light sensitive, positive working, naphthoquinone diazide compound in an amount sufficient to photosensitize the layer; a resinous binder composition in an amount sufficient to bind the layer ingredients into a uniform admixture, which composition contains a major amount of at least one resin selected from the group consisting of a polyvinyl butyral polymer and a styrene-maleic anhydride copolymer half ester; and at least one colorant in an amount sufficient to uniformly color the layer; and (iii) an adhesive layer on said photosensitive layer, which adhesive layer comprises a major amount of a polymer such that said adhesive layer has a softening point in the range of from about 60° C. to about 180° C., and a sufficient amount of an optical brightener compound effective to reduce residual yellow color in the element derived from said diazide.
Claim 17
Dependent Claim
11 words
The element of claim 14 wherein said substrate comprises polyethylene terepthalate.
Claim 18
Dependent Claim
12 words
The element of claim 14 wherein said substrate has a matte surface.
Claim 19
Dependent Claim
15 words
The element of claim 14 wherein said release surface on said substrate comprises polyvinyl alcohol.
Claim 20
Dependent Claim
19 words
The element of claim 14 wherein said photosensitive layer comprises the ester of bis-(3-benzoyl-4,5,6 trihydroxy phenyl)methane and 2-diazo-1-naphthol-5-sulfonic acid.
Claim 21
Dependent Claim
30 words
The element of claim 14 wherein said photosensitive layer further comprises one or more ingredients selected from the group consisting of plasticizers, acid stabilizers, antistatic compositions, uv absorbers and surfactants.
Claim 22
Dependent Claim
29 words
The element of claim 14 wherein the adhesive layer further comprises one or more ingredients selected from the group consisting of uv absorbers, anti-static compositions, resins, nitrocellulose and plasticizers.
Claim 23
Dependent Claim
37 words
The element of claim 14 wherein said adhesive layer comprises one or more polymers selected from the group consisting of polyvinyl acetate containing copolymers, polyvinyl acetals, acrylic resins, cellulose nitrate, phenolic resins, epoxy resins and copolymers thereof.
Claim 24
Dependent Claim
24 words
The element of claim 14 wherein said optical brightener compound is selected from the group consisting of triazinyl stilbene, pyrazoline, benzoxazole and coumarin derivatives.
Claim 25
Dependent Claim
29 words
The element of claim 14 wherein said optical brightener compound is present in an amount of from about 0.01 to about 1.0 percent by weight of the adhesive layer.
Claim 26
Dependent Claim
12 words
The element of claim 14 wherein the adhesive layer comprises polyvinyl acetate.
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) | 1992-09-25 | 1993-03-27 | 1993-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-25 | 1997-03-27 | 1997-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-25 | 2001-03-27 | 2001-09-26 | $7700.00 | Window Closed / Lapsed |