US3923518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Erasable diazotype material with vinyl chloride and methyl acrylate copolymer interlayer
Assignee: Andrews Paper and Chemical Co Inc
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Filing: 1973-04-10
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Granted: 1975-12-02
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Expires: 1993-04-10
Abstract
Abstract Written, typed, penciled, printed and other markings on paper and foils can be erased easily by mechanical means by utilizing an improved interlayer between the surface of the base material and the markings. The interlayer includes a copolymer resin of acrylate-vinyl chloride. The provision of such an interlayer is particularly useful for diazotype intermediate prints.
Inventors
- 👤 Peter Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:13
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/775; G03C1/785; D; D21; D21H; D21H19/00; D21H19/80; D21H19/84; G03C1/52; G03C1/81; G03C1/95; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31667; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31906; Y10T428/31909; Y10T428/31928
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
126 words
AN ERASABLE DIAZOTYPE REPRODUCTION MATERIAL COMPRISING: A BASE SHEET HAVING APPLIED THERETO AT LEAST THREE LAYERS COATED ON AT LEAST ONE SIDE OF SAID BASE SHEET WITH AT LEAST ONE OF SAID LAYERS FORMING AN INTERLAYER CNTAINING AN EXTERNALLY PLASTICIZED VINYL CHLORIDE-METHYL ACRYLATE COPOLMER WHEREIN FORM 70% TO 90% OF THE COPOLYMER IS POLYVINYL CHLORIDE AND THE BALANCE IS MADE UP OF METHYL ACRYLATE RADICALS, AT LEAST ONE OF SAID LAYERS CONTAINING DIAZO SENSITIZED COMPONENTS WHICH COMPRISES A PHTOSENSITIVE DIAZONIUM SALT, AN ACID STABILIZER AND A DIAZO-COUPLER AND AT LEAST ONE OF SAID LAYERS BEING A PRECOAT LAYER POSITIONED BETWEEN SAID DIAZO COMPONENTS CONTAINING LAYER AND SAID INTERLAYER; WHEREBY THE DIAZO REPRODUCTION IS EASILY ERASED BY MECHANICAL MEANS WITHOUT DESTROYING THE SURFACE OF THE BASE SHEET.
Claim 2
Dependent Claim
126 words
AN ERASABLE DIAZOTYPE REPRODUCTION MATERIAL COMPRISING: A BASE SHEET HAVING APPLIED THERETO AT LEAST THREE LAYERS COATED ON AT LEAST ONE SIDE OF SAID BASE SHEET WITH AT LEAST ONE OF SAID LAYERS FORMING AN INTERLAYER CNTAINING AN EXTERNALLY PLASTICIZED VINYL CHLORIDE-METHYL ACRYLATE COPOLMER WHEREIN FORM 70% TO 90% OF THE COPOLYMER IS POLYVINYL CHLORIDE AND THE BALANCE IS MADE UP OF METHYL ACRYLATE RADICALS, AT LEAST ONE OF SAID LAYERS CONTAINING DIAZO SENSITIZED COMPONENTS WHICH COMPRISES A PHTOSENSITIVE DIAZONIUM SALT, AN ACID STABILIZER AND A DIAZO-COUPLER AND AT LEAST ONE OF SAID LAYERS BEING A PRECOAT LAYER POSITIONED BETWEEN SAID DIAZO COMPONENTS CONTAINING LAYER AND SAID INTERLAYER; WHEREBY THE DIAZO REPRODUCTION IS EASILY ERASED BY MECHANICAL MEANS WITHOUT DESTROYING THE SURFACE OF THE BASE SHEET.
Claim 3
Dependent Claim
14 words
The erasable diazotype reproduction material of claim 1 wherein said base sheet is paper.
Claim 4
Dependent Claim
17 words
The erasable diazotype reproduction material of claim 1 wherein said base sheet is a transparentized base sheet.
Claim 5
Dependent Claim
30 words
The erasable diazotype reproduction material of claim 1 wherein said other surface of said base sheet has applied thereto a backcoating to prevent curling of the base sheet during processing.
Claim 6
Dependent Claim
13 words
The material of claim 1 wherein the copolymer is externally plasticized with dioctylphthalate.
Claim 7
Dependent Claim
23 words
The reproduction material of claim 1 wherein said diazo component containing layer is applied from an aqueous mixture of said diazo sensitive components.
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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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |