US5030538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing overhead transparencies having high color density images using a double sided image recording material
Assignee: Mead Corp
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Filing: 1990-05-01
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Granted: 1991-07-09
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Expires: 2010-05-01
Abstract
Abstract A method is described for forming a transparency containing images having high color density comprising the steps of: forming an imaging sheet, said imaging sheet comprising a substrate having a layer of microcapsules on the front surface and on the back surface thereof, of microcapsules containing an internal phase which undergoes a physical change upon exposure to actinic radiation, and a color forming agent which is capable of reacting with a developer-containing resing to form a visible image thereon; simultaneously image-wise exposing said microcapsules on said front and said back surfaces of said imaging sheet to actinic radiation; assembling said exposed imaging sheet between a pair of developer sheets wherein each of said developer sheets comprises a substrate having a layer of developer-containing resin on one surface thereof, said layer of developer-containing resin on each of said developer sheets contacting the adjacent surface of said imaging sheet; subjecting said assembly to a uniform rupturing and transfer force wherein said microcapsules are ruptured in an image-wise pattern and said color-forming agent contained in said ruptured capsules is transferred to said developer-containing resin wherein an image-wise reaction between said developer-containing resin and said color-forming agent produces a visible image on each developer sheet, said visible images being mirror images of each other; separating said developer sheets from said imaging sheet; assembling said developer sheets such that said visible images are in registration, said visible images being mirror images of each other; and adhering said developer sheets, one to the other, to provide a transparency having high color density.
Inventors
- 👤 Russell H. Tobias
- 👤 James A. Dowler
- 👤 Richard Sutera
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:46
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/002; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S428/914; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985; Y10T428/2987; Y10T428/2989
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
254 words
A method for forming a transparency containing images having high color density comprising the steps of: forming an imaging sheet, said imaging sheet comprising a substrate having a layer of microcapsules on the front surface and on the back surface thereof, said microcapsules containing an internal phase which undergoes a physical change upon exposure to actinic radiation, and a color forming agent which is capable of reacting with a developer-containing resin to form a visible image thereon; simultaneously image-wise exposing said microcapsules on said front and said back surfaces of said imaging sheet to actinic radiation; assembling said exposed imaging sheet between a pair of developer sheets wherein each of said developer sheets comprises a substrate having a layer of developer-containing resin on one surface thereof, said layer of developer-containing resin on each of said developer sheets contacting the adjacent surface of said imaging sheet; subjecting said assembly to a uniform rupturing and transfer force wherein said microcapsules are ruptured in an image-wise pattern and said color-forming agent contained in said ruptured capsules is transferred to said developer-containing resin wherein an image-wise reaction between said developer-containing resin and said color-forming agent produces a visible image on each developer sheet, said visible images being mirror images of each other; separating said developer sheets from said imaging sheet; assembling said developer sheets such that said visible images are in registration, said visible images being mirror images of each other; and laminating said developer sheets, one to the other, to provide a transparency having high color density.
Claim 2
Independent Claim
254 words
A method for forming a transparency containing images having high color density comprising the steps of: forming an imaging sheet, said imaging sheet comprising a substrate having a layer of microcapsules on the front surface and on the back surface thereof, said microcapsules containing an internal phase which undergoes a physical change upon exposure to actinic radiation, and a color forming agent which is capable of reacting with a developer-containing resin to form a visible image thereon; simultaneously image-wise exposing said microcapsules on said front and said back surfaces of said imaging sheet to actinic radiation; assembling said exposed imaging sheet between a pair of developer sheets wherein each of said developer sheets comprises a substrate having a layer of developer-containing resin on one surface thereof, said layer of developer-containing resin on each of said developer sheets contacting the adjacent surface of said imaging sheet; subjecting said assembly to a uniform rupturing and transfer force wherein said microcapsules are ruptured in an image-wise pattern and said color-forming agent contained in said ruptured capsules is transferred to said developer-containing resin wherein an image-wise reaction between said developer-containing resin and said color-forming agent produces a visible image on each developer sheet, said visible images being mirror images of each other; separating said developer sheets from said imaging sheet; assembling said developer sheets such that said visible images are in registration, said visible images being mirror images of each other; and laminating said developer sheets, one to the other, to provide a transparency having high color density.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein said substrate is a transparent polyethylene terephthalate film.
Claim 4
Dependent Claim
23 words
The method of claim 2 wherein said developer-containing resin is further characterized in that it exhibits the properties of a hot melt adhesive.
Claim 5
Dependent Claim
13 words
The method of claim 3 wherein said developer-containing resin is a phenolic resin.
Claim 6
Dependent Claim
20 words
The method of claim 4 wherein said phenolic resin is a product of oxidative coupling of a phenol or biphenol.
Claim 7
Dependent Claim
18 words
The method of claim 5 wherein said phenolic resin is a product of oxidative coupling of Bisphenol A.
Claim 8
Dependent Claim
21 words
The process of claim 6 wherein said oxidative coupling is performed in the presence of the enzyme, horseradish peroxidase as catalyst.
Claim 9
Dependent Claim
14 words
The process of claim 4 wherein said developer-containing resin is a metallated phenolic resin.
Claim 10
Dependent Claim
26 words
The method of claim 5 wherein said developer-containing resin is a zincated phenolic resin formed from the reaction of a high alkyl phenol and salicylic acid.
Claim 11
Dependent Claim
21 words
The method of claim 3 wherein said developer-containing resin is a mixture of a developer resin and a hot melt adhesive.
Claim 12
Dependent Claim
15 words
The method of claim 1 wherein said developer resin is an acrylic or vinylic resin.
Claim 13
Dependent Claim
22 words
The method of claim 1 wherein said developer resin is a blend of a phenolic resin and an acrylic or vinylic resin.
Claim 14
Dependent Claim
14 words
The method of claim 1 wherein said photosensitive composition includes an ethylenically unsaturated compound.
Claim 15
Dependent Claim
31 words
The method of claim 1 wherein said pair of developer sheets comprises a single double-width sheet folded along the midline, said sheet having said developer-containing resin on the inner surface thereof.
Claim 16
Dependent Claim
19 words
The method of claim 1 wherein said pair of developer sheets are pre-joined along one edge by adhesive means.
Claim 17
Dependent Claim
17 words
The method of claim 1 wherein said developer sheets are laminated to each other at elevated temperature.
Claim 18
Dependent Claim
17 words
The method of claim 16 wherein said elevated temperature is from about 75° to about 135° C.
Claim 19
Dependent Claim
17 words
The method of claim 2 wherein said actinic radiation is reflected back through said layer of microcapsules.
Claim 20
Dependent Claim
28 words
The method of claim 1 wherein said actinic radiation is independently focused on said front and said back surfaces of said imaging sheet to image-wise expose said microcapsules.
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) | 1994-07-08 | 1995-01-07 | 1995-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-08 | 1999-01-07 | 1999-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-08 | 2003-01-07 | 2003-07-09 | $7700.00 | Window Closed / Lapsed |